WO2017046907A1 - 情報出力装置 - Google Patents
情報出力装置 Download PDFInfo
- Publication number
- WO2017046907A1 WO2017046907A1 PCT/JP2015/076399 JP2015076399W WO2017046907A1 WO 2017046907 A1 WO2017046907 A1 WO 2017046907A1 JP 2015076399 W JP2015076399 W JP 2015076399W WO 2017046907 A1 WO2017046907 A1 WO 2017046907A1
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- WIPO (PCT)
- Prior art keywords
- crank
- strain gauge
- strain
- output
- information
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M3/00—Construction of cranks operated by hand or foot
- B62M3/08—Pedals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
- B62J45/20—Cycle computers as cycle accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
- B62J45/40—Sensor arrangements; Mounting thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J50/00—Arrangements specially adapted for use on cycles not provided for in main groups B62J1/00 - B62J45/00
- B62J50/20—Information-providing devices
- B62J50/21—Information-providing devices intended to provide information to rider or passenger
- B62J50/22—Information-providing devices intended to provide information to rider or passenger electronic, e.g. displays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J99/00—Subject matter not provided for in other groups of this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M3/00—Construction of cranks operated by hand or foot
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/225—Measuring circuits therefor
- G01L1/2262—Measuring circuits therefor involving simple electrical bridges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
- G01L3/247—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity by measuring and simultaneously multiplying tractive or propulsive force and velocity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J50/00—Arrangements specially adapted for use on cycles not provided for in main groups B62J1/00 - B62J45/00
- B62J50/20—Information-providing devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J50/00—Arrangements specially adapted for use on cycles not provided for in main groups B62J1/00 - B62J45/00
- B62J50/20—Information-providing devices
- B62J50/21—Information-providing devices intended to provide information to rider or passenger
- B62J50/225—Mounting arrangements therefor
Definitions
- the present invention relates to an information output device that outputs information on the force applied to a manpower machine equipped with a crank.
- Patent Document 1 discloses a technique for measuring the crankshaft strain and detecting the torque applied to the crank.
- Patent Document 2 discloses a technique in which a piezoelectric sensor is embedded in a crank and torque is measured by a voltage generated by crank distortion.
- Patent Document 1 describes that it can be applied to a stationary bicycle type health machine (also called a bicycle ergometer or a fitness bike).
- an object of the present invention is to provide an information output device that can output, for example, a load position applied to a pedal.
- the invention described in claim 1 is provided on a side surface of a crank of a human-powered machine and is based on strain detection means for detecting strain generated in the crank, and an output value of the strain detection means. Applied to the pedal connected to the crank based on the force acting in the tangential direction of the circle defined by the rotational movement of the crank and the torque acting in the direction causing twisting of the crank. And an output means for outputting information relating to the center position of the loaded load.
- the invention described in claim 7 is an information output method executed by an information output device provided on a side surface of a crank of a human-powered machine and provided with a strain detection means for detecting strain generated in the crank.
- the invention described in claim 8 is an information output program that causes a computer to execute the information output method according to claim 7.
- the invention described in claim 9 is a computer-readable recording medium in which the information output program according to claim 8 is stored.
- FIG. 2 is a block configuration diagram of a cycle computer, a measurement module, and a cadence sensor shown in FIG. 1. It is explanatory drawing of arrangement
- FIG. 4 is a circuit diagram of a measurement module strain detection circuit shown in FIG. 3. It is explanatory drawing of the force added to a right side crank, and a deformation
- the strain detecting means is provided on the side surface of the crank of the human-powered machine, detects the strain generated in the crank, and the output means is based on the output value of the strain detecting means.
- the center of the load applied to the pedal connected to the crank based on the calculated force acting in the tangential direction of the circle defined by the rotational movement of the crank and the torque acting in the direction causing twisting of the crank Output location information.
- the strain detection means is provided on each side of the crank that the human-powered machine has in a pair of left and right, and the output means displays information on the center position of the load applied to the pedals connected to the left and right cranks side by side. It may be output. By doing in this way, the user etc. can compare and confirm the pedaling balance of right and left, and can use it for improvement of a pedaling form etc.
- the output means may output the load center position set in advance as a reference to the center position of the load applied to the pedal detected by the strain detection means in a manner capable of being compared.
- a user etc. can compare the load center in his pedaling with the load center in appropriate pedaling, and it can be used for improvement of a pedaling form etc.
- the strain detection means includes a first strain gauge portion that detects strain tangentially generated in the crank and a second strain gauge portion that detects strain generated in the crank and deformed in the torsional direction of the crank. It has a plurality of strain gauge parts.
- the plurality of strain gauge portions may output a voltage value corresponding to the amount of deformation of the crank in a direction in which each strain gauge portion detects strain. By doing so, it is possible to calculate the force acting in the tangential direction of the circle defined by the rotational movement of the crank and the torque acting in the direction causing twisting of the crank, based on the output voltage values of the plurality of strain gauge portions. it can.
- the force acting in the tangential direction of the circle defined by the rotational movement of the crank and the torque acting in the direction that causes the torsion of the crank are calculated by substituting the voltage values output by the multiple strain gauge sections into a predetermined polynomial. May be. By doing in this way, it is computable by calculation using CPU etc., for example.
- the coefficient of each term of the predetermined polynomial is a first reference torsional torque applied to the crank in a first state in which a predetermined load is applied to a position on the pedal that is separated from the center axis of the crank by a first distance;
- the second reference torsion torque applied to the crank, the first state, and the second state It may be set in advance based on voltage values output by the plurality of strain gauge portions in each state.
- the coefficient can be calculated in advance. Therefore, the force acting in the tangential direction of the circle defined by the rotational motion of the crank and the torque acting in the direction causing twisting of the crank can be calculated simply by substituting the values actually measured in the strain gauge portion into the polynomial. In addition, since the coefficient can be changed in accordance with the crank, the force acting in the tangential direction of the circle defined by the rotational movement of the crank and the torque acting in the direction causing twisting of the crank can be calculated with precision. Can do.
- the force acting in the tangential direction of the circle defined by the rotational movement of the rank and the torque acting in the direction causing twisting of the crank are distorted.
- a force acting in the tangential direction of the circle defined by the rotational motion of the crank calculated in the calculation step, and a torque acting in a direction causing twisting of the crank Based on, information on the center position of the load applied to the pedal connected to the crank is output.
- an information output program causes a computer to execute the information output method described above. By doing so, information about the center position of the load applied to the pedal can be calculated and output from the detection result of the strain detecting means provided on the crank using a computer. Efficient pedaling and the like.
- the information output program described above may be stored in a computer-readable recording medium.
- the program can be distributed as a single unit in addition to being incorporated in the device, and version upgrades can be easily performed.
- a bicycle 1 including a cycle computer 201 and a measurement module 301 as an information output device according to a first embodiment of the present invention will be described with reference to FIGS.
- the bicycle 1 includes a frame 3, a front wheel 5, a rear wheel 7, a handle 9, a saddle 11, a front fork 13, and a drive mechanism 101.
- Frame 3 is composed of two truss structures.
- the frame 3 is rotatably connected to the rear wheel 7 at the rear end portion.
- the front fork 13 is rotatably connected to the frame 3 in front of the frame 3.
- the front fork 13 is connected to the handle 9.
- the front fork 13 and the front wheel 5 are rotatably connected at the front end position of the front fork 13 in the downward direction.
- the front wheel 5 has a hub part, a spoke part, and a tire part.
- the hub portion is rotatably connected to the front fork 13. And this hub part and the tire part are connected by the spoke part.
- the rear wheel 7 has a hub part, a spoke part, and a tire part.
- the hub portion is rotatably connected to the frame 3. And this hub part and the tire part are connected by the spoke part.
- the hub portion of the rear wheel 7 is connected to a sprocket 113 described later.
- the bicycle 1 has a drive mechanism 101 that converts the stepping force by the user's (driver) foot into the driving force of the bicycle 1.
- the drive mechanism 101 includes a pedal 103, a crank mechanism 104, a chain ring 109, a chain 111, and a sprocket 113.
- the pedal 103 is a part in contact with a foot for the user to step on.
- the pedal 103 is supported so as to be rotatable by a pedal crankshaft 115 of the crank mechanism 104.
- the crank mechanism 104 includes a crank 105, a crankshaft 107, and a pedal crankshaft 115 (see FIGS. 2 and 6).
- the crankshaft 107 passes through the frame 3 in the left-right direction (from one side of the bicycle side to the other).
- the crankshaft 107 is rotatably supported by the frame 3.
- the crank 105 is provided at a right angle to the crankshaft 107.
- the crank 105 is connected to the crankshaft 107 at one end.
- the pedal crankshaft 115 is provided at a right angle to the crank 105.
- the axial direction of the pedal crankshaft 115 is the same as that of the crankshaft 107.
- the pedal crankshaft 115 is connected to the crank 105 at the other end of the crank 105.
- the crank mechanism 104 has such a structure on the side opposite to the side surface of the bicycle 1. That is, the crank mechanism 104 has two cranks 105 and two pedal crankshafts 115. Therefore, the pedal 103 is also provided on each side of the bicycle 1.
- the right crank 105R and the left crank 105L are connected so as to extend in opposite directions around the crankshaft 107.
- the right pedal crankshaft 115R, the crankshaft 107, and the left pedal crankshaft 115L are formed in parallel and on the same plane.
- the right crank 105R and the left crank 105L are formed in parallel and on the same plane.
- the chain ring 109 is connected to the crankshaft 107.
- the chain ring 109 is preferably constituted by a variable gear capable of changing the gear ratio.
- a chain 111 is engaged with the chain ring 109.
- the chain 111 is engaged with the chain ring 109 and the sprocket 113.
- the sprocket 113 is connected to the rear wheel 7.
- the sprocket 113 is preferably composed of a variable gear.
- the bicycle 1 converts the stepping force of the user into the rotational force of the rear wheel by such a drive mechanism 101.
- the bicycle 1 has a cycle computer 201, a measurement module 301, and a cadence sensor 501.
- the cycle computer 201 is disposed on the handle 9. As shown in FIG. 2, the cycle computer 201 includes a cycle computer display unit 203 that displays various types of information and a cycle computer operation unit 205 that receives user operations.
- the various types of information displayed on the cycle computer display unit 203 include the speed of the bicycle 1, position information, the distance to the destination, the estimated arrival time to the destination, the travel distance since the departure, and the elapsed time since the departure. These are time, propulsive force, loss force, load center position applied to the pedal 103, and the like.
- the propulsive force is the force applied in the rotational direction of the crank 105, that is, the magnitude of the force acting in the tangential direction of the circle defined by the rotational motion of the crank 105.
- the loss force is a magnitude of a force applied in a direction different from the rotation direction of the crank 105.
- the force applied in a direction different from the rotational direction is a useless force that does not contribute to the driving of the bicycle 1. Therefore, the user can drive the bicycle 1 more efficiently by increasing the propulsive force as much as possible and decreasing the loss force as much as possible.
- the cycle computer operation unit 205 is shown as a push button in FIG. 2, but is not limited thereto, and various input means such as a touch panel or a plurality of input means can be used in combination.
- the cycle computer 201 includes a cycle computer cadence wireless reception unit 207 and a cycle computer wireless reception unit 209.
- the cycle computer cadence wireless reception unit 207 and the cycle computer wireless reception unit 209 are connected to the main body portion of the cycle computer 201 through wiring.
- the cycle computer cadence wireless reception unit 207 and the cycle computer wireless reception unit 209 need not have a reception-only function. For example, you may have a function as a transmission part.
- an apparatus described as a transmission unit or a reception unit may also have both a reception function and a transmission function.
- the cadence sensor 501 has a magnetic sensor 505 that detects the approach of a magnet 503 provided on the crank 105 (see FIG. 3).
- the magnetic sensor 505 detects the position of the magnet 503 by being turned on by the approaching magnet 503. That is, when the magnetic sensor 505 is turned on, the crank 105 is also present at the position where the magnetic sensor 505 is present. From this cadence sensor 501, the cycle computer 201 can obtain cadence [rpm].
- the measurement module 301 is provided on the inner surface of the crank 105, and detects a human force applied to the pedal 103 by a user using a strain gauge 369 (see FIGS. 3 and 4) including a plurality of strain gauge elements. Specifically, the propulsive force that is the rotational force of the crank 105 and serves as the driving force of the bicycle 1, the loss force that is a force applied in a direction different from the rotational direction, and the load center position applied to the pedal 103 Etc. are calculated.
- FIG. 3 is a block diagram of the cycle computer 201, the measurement module 301, and the cadence sensor 501.
- the cadence sensor 501 includes a magnetic sensor 505, a cadence sensor wireless transmission unit 507, a cadence sensor control unit 551, a cadence sensor storage unit 553, and a cadence sensor timer 561.
- the magnetic sensor 505 is switched ON / OFF when the magnet 503 approaches. When the magnetic sensor 505 is turned on, the magnetic sensor 505 outputs an information signal indicating that to the cadence sensor control unit 551.
- the cadence sensor wireless transmission unit 507 transmits the cadence information stored in the cadence sensor storage unit 553 to the cycle computer cadence wireless reception unit 207.
- the transmission by the cadence sensor wireless transmission unit 507 is performed, for example, every second by an instruction from the cadence sensor timer 561.
- a determination based on the value of the cadence sensor timer 561 is performed by the cadence sensor control unit 551, and based on the determination, transmission by the cadence sensor wireless transmission unit 507 is performed according to a command from the cadence sensor control unit 551. good.
- the cadence sensor control unit 551 comprehensively controls the cadence sensor 501.
- the cadence sensor control unit 551 receives an output of an information signal indicating that the magnetic sensor 505 is turned on, the cadence sensor control unit 551 performs the following operation.
- the cadence sensor control unit 551 instructs the cadence sensor timer 561 to output timer value information.
- the cadence sensor control unit 551 receives timer value information from the cadence sensor timer 561
- the cadence sensor control unit 551 calculates cadence from the timer value information. Specifically, the time (period) [second] for turning on the magnetic sensor 505 is calculated by multiplying the count number (C) of the timer value information by one count interval (T0). Then, cadence [rpm] is calculated by dividing 60 by this period.
- the cadence sensor control unit 551 stores the cadence information in a cadence sensor RAM 555 (described later) of the cadence sensor storage unit 553.
- the cadence sensor control unit 551 outputs a counter value reset command to the cadence sensor timer 561.
- the cadence sensor control unit 551 may cause the cadence sensor wireless transmission unit 507 to transmit the cadence information stored in the cadence sensor storage unit 553, for example, at an interval of 1 second.
- the cadence sensor storage unit 553 includes a cadence sensor RAM 555 and a cadence sensor ROM 557.
- the cadence sensor RAM 555 stores timer values and the like, and the cadence sensor ROM 557 stores control programs and the like.
- the cadence sensor timer 561 is a timer counter and always counts a clock having a predetermined cycle.
- the cadence sensor timer 561 receives a value output command from the cadence sensor control unit 551
- the cadence sensor timer 561 outputs timer value information to the cadence sensor control unit 551.
- the cadence sensor timer 561 receives a reset command from the cadence sensor control unit 551
- the cadence sensor timer 561 resets the value of the timer counter to an initial value.
- the cadence sensor timer 561 also has a role of instructing the cadence sensor wireless transmission unit 507 to transmit timing. Specifically, for example, the transmission timing is commanded to the cadence sensor wireless transmission unit 507 every second.
- the measurement module 301 includes a measurement module wireless transmission unit 309, a measurement module timer 361, a measurement module control unit 351, a measurement module storage unit 353, a measurement module A / D 363, a measurement module strain detection circuit 365, and A strain gauge 369 is provided.
- the measurement module wireless transmission unit 309 transmits the propulsive force, the loss force, the load center position applied to the pedal 103, and the like calculated from the strain information by the measurement module control unit 351 to the cycle computer wireless reception unit 209. Transmission by the measurement module wireless transmission unit 309 is performed, for example, every second by being commanded by the measurement module timer 361. Alternatively, the measurement module control unit 351 may transmit a command based on the value of the measurement module timer 361.
- the measurement module timer 361 is a timer counter and always counts a clock having a predetermined period. Furthermore, the measurement module timer 361 also has a role of instructing the measurement module wireless transmission unit 309 to transmit timing. Specifically, for example, the transmission timing is commanded to the measurement module wireless transmission unit 309 every second.
- the measurement module control unit 351 comprehensively controls the measurement module 301.
- the measurement module control unit 351 calculates a propulsive force, a loss force, a load center position applied to the pedal 103, and the like from the strain information. The calculation method will be described later.
- the measurement module storage unit 353 stores various types of information.
- the various types of information are, for example, a control program for the measurement module control unit 351 and temporary information required when the measurement module control unit 351 performs control.
- strain information is stored.
- the measurement module storage unit 353 includes a measurement module RAM 355 and a measurement module ROM 357.
- the measurement module RAM 355 stores strain information and the like.
- the measurement module ROM 357 stores various parameters, constants, and the like for calculating a propulsive force, a loss force, and a load center position applied to the pedal 103 from the control program and strain information.
- the strain gauge 369 is bonded to the crank 105 and integrated.
- the strain gauge 369 includes a first strain gauge 369a, a second strain gauge 369b, a third strain gauge 369c, a fourth strain gauge 369d, a fifth strain gauge 369e, and a sixth strain gauge 369f.
- Each terminal of the strain gauge 369 is connected to the measurement module strain detection circuit 365.
- the strain gauge 369 is not limited to being provided on the left and right cranks 105, but may be provided only on one crank 105.
- FIG. 4 shows the arrangement of the strain gauge 369 on the crank 105 in this embodiment.
- the strain gauge 369 is bonded to the inner surface 119 of the crank 105.
- the inner surface of the crank 105 is a surface on which the crankshaft 107 is protruded (connected), and is a surface (side surface) parallel to a plane including a circle defined by the rotational motion of the crank 105.
- the outer surface 120 of the crank 105 is a surface on which the pedal crankshaft 115 is protruded (connected) so as to face the inner surface 119. That is, it is a surface on which the pedal 103 is rotatably provided.
- the upper surface 117 of the crank 105 is one of the surfaces extending in the longitudinal direction in the same direction as the inner surface 119 and the outer surface 120 and orthogonal to the inner surface 119 and the outer surface 120.
- a lower surface 118 of the crank 105 is a surface facing the upper surface 117.
- the first strain gauge 369a and the second strain gauge 369b are arranged so as to be orthogonal to each other and overlapped with each other. Further, the intermediate direction between the detection direction of the first strain gauge 369 a and the detection direction of the second strain gauge 369 b is arranged to be the longitudinal direction of the crank 105. That is, the detection direction of the first strain gauge 369a and the longitudinal direction of the crank 105 have an angle of 45 degrees. The detection direction of the second strain gauge 369b and the longitudinal direction of the crank 105 have an angle of 45 degrees. Further, the intersection portion where the first strain gauge 369a and the second strain gauge 369b are overlapped is arranged on the central axis C1 of the inner surface 119. That is, the first strain gauge 369a and the second strain gauge 369b are arranged so as to be symmetric with respect to the central axis C1.
- the third strain gauge 369c has a detection direction parallel to the longitudinal direction of the crank 105, that is, is parallel to the central axis C1 of the inner surface 119 and is provided on the central axis C1.
- the fourth strain gauge 369d is provided on the central axis C1 in the detection direction perpendicular to the longitudinal direction of the crank 105, that is, perpendicular to the central axis C1 of the inner surface 119.
- the fifth strain gauge 369e and the sixth strain gauge 369f have a detection direction parallel to the longitudinal direction of the crank 105, that is, parallel to the central axis C1 of the inner surface 119 and symmetrical to the central axis C1 of the inner surface 119. It is provided to become.
- the direction parallel to the central axis C1 that is the axis extending in the longitudinal direction of the crank 105 is the third strain gauge 369c
- the detection direction of the strain gauge 369e and the sixth strain gauge 369f is the detection direction of the fourth strain gauge 369d in the direction perpendicular to the central axis C1 (the lateral direction in FIG. 4), that is, the direction perpendicular to the longitudinal direction of the crank 105. It becomes. Therefore, the detection directions of the third strain gauge 369c, the fifth strain gauge 369e, the sixth strain gauge 369f, and the fourth strain gauge 369d are orthogonal to each other. That is, the strain gauge 369 functions as a strain detection unit that detects strain generated in the crank 105.
- or the 6th strain gauge 369f is not restricted to FIG. That is, the third strain gauge 369c to the sixth strain gauge 369f only need to maintain a parallel or perpendicular relationship with the central axis C1, and the first strain gauge 369a and the second strain gauge 369b sandwich the central axis C1. As long as they are inclined so as to face each other, the angle may not be 45 degrees or may not be overlapped. Furthermore, it does not need to be arranged on the inner surface 119 of the crank 105, and may be arranged so that at least the propulsive force and the torsion torque described later can be calculated.
- crank 105 is described as a simple rectangular parallelepiped, but the corner may be rounded or a part of the surface may be configured by a curved surface depending on the design or the like. Even in such a case, each deformation described later can be detected by arranging the strain gauge 369 so as to maintain the above-described arrangement as much as possible. However, the detection accuracy decreases as the relationship with the above-described central axis C1 and the first strain gauge 369a and the second strain gauge 369b are shifted from each other.
- the measurement module strain detection circuit 365 is connected to the first strain gauge 369a, the second strain gauge 369b, the third strain gauge 369c, the fourth strain gauge 369d, the fifth strain gauge 369e, and the sixth strain gauge 369f.
- a distortion amount of 369 is output as a voltage value.
- the output of the measurement module strain detection circuit 365 is converted from analog information to strain information that is digital information by the measurement module A / D 363.
- the strain information signal is output to the measurement module storage unit 353.
- the strain information signal input to the measurement module storage unit 353 is stored in the measurement module RAM 355 as strain information.
- the measurement module strain detection circuit 365 is shown in FIG.
- the measurement module strain detection circuit 365 includes a first detection circuit 373a, a second detection circuit 373b, and a third detection circuit 373c.
- a fifth strain gauge 369e and a sixth strain gauge 369f are connected in series between the power supply Vcc and the ground GND. That is, the power source Vcc, the fifth strain gauge 369e, the sixth strain gauge 369f, and the ground GND are connected in this order.
- the connection point between the fifth strain gauge 369e and the sixth strain gauge 369f is the output of the first detection circuit 373a (hereinafter referred to as t output).
- a third strain gauge 369c and a fourth strain gauge 369d are connected in series between the power supply Vcc and the ground GND. That is, the power source Vcc, the third strain gauge 369c, the fourth strain gauge 369d, and the ground GND are connected in this order.
- the connection point between the third strain gauge 369c and the fourth strain gauge 369d is the output of the second detection circuit 373b (hereinafter referred to as r output).
- a first strain gauge 369a and a second strain gauge 369b are connected in series between the power supply Vcc and the ground GND. That is, the power supply Vcc, the first strain gauge 369a, the second strain gauge 369b, and the ground GND are connected in this order.
- a connection point between the first strain gauge 369a and the second strain gauge 369b is an output (hereinafter referred to as k output) of the third detection circuit 373c.
- first strain gauge 369a to the sixth strain gauge 369f have the same resistance value.
- the detection direction of the strain gauge 369 is the direction in which the wiring extends, and as described above, the third strain gauge 369c, the fifth strain gauge 369e, and the sixth strain gauge 369f are parallel to the central axis C1,
- the fourth strain gauge 369d is in a direction perpendicular to the central axis C1.
- the first strain gauge 369a and the second strain gauge 369b are oriented at 45 degrees.
- the output t is output from the power source Vcc.
- the voltage is half the voltage value of the power supply Vcc (1/2 Vcc), which is a value obtained by dividing the voltage by the fifth strain gauge 369e, the resistance value, and the sixth strain gauge 369f.
- both the fifth strain gauge 369e and the sixth strain gauge 369f When both the fifth strain gauge 369e and the sixth strain gauge 369f are compressed, the resistance value of both the fifth strain gauge 369e and the sixth strain gauge 369f decreases, so the t output does not change (the voltage value is 1/2 Vcc). Will remain).
- both the fifth strain gauge 369e and the sixth strain gauge 369f are extended, the resistance value increases for both the fifth strain gauge 369e and the sixth strain gauge 369f, so the t output does not change.
- the second detection circuit 373b operates similarly to the first detection circuit 373a. That is, when the third strain gauge 369c is compressed and the fourth strain gauge 369d is expanded, the r output increases, and when the third strain gauge 369c is expanded and the fourth strain gauge 369d is compressed, r The output goes down. The r output does not change when both the third strain gauge 369c and the fourth strain gauge 369d are compressed and when both the third strain gauge 369c and the fourth strain gauge 369d are expanded.
- the third detection circuit 373c operates similarly to the first detection circuit 373a. That is, when the first strain gauge 369a is compressed and the second strain gauge 369b is expanded, the k output increases, and when the first strain gauge 369a is expanded and the second strain gauge 369b is compressed, k The output goes down. The k output does not change when both the first strain gauge 369a and the second strain gauge 369b are compressed and when both the first strain gauge 369a and the second strain gauge 369b are expanded.
- the t output of the first detection circuit 373a, the r output of the second detection circuit 373b, and the k output of the third detection circuit 373c are voltage values output by a plurality of strain gauge units.
- FIG. 6 shows a deformed state of the right crank 105R when a force (stepping force) is applied by the user.
- A is a plan view seen from the inner surface 119 of the right crank 105R
- (b) is a plan view seen from the upper surface 117 of the right crank 105R
- (c) is seen from the end of the right crank 105R on the crankshaft 107 side. It is a top view.
- the right crank 105R will be described, but the same applies to the left crank 105L.
- the bending deformation x is a deformation in which the right crank 105R bends from the upper surface 117 toward the lower surface 118 or from the lower surface 118 toward the upper surface 117, and the tangential force T Is a deformation caused by That is, distortion due to deformation generated in the rotation direction of the crank 105 (distortion generated in the rotation direction of the crank 105) is detected, and rotation direction distortion generated in the crank 105 can be detected by detecting the bending deformation x.
- the bending deformation y is a deformation in which the right crank 105R is bent so as to bend from the outer surface 120 toward the inner surface 119 or from the inner surface 119 toward the outer surface 120.
- This is a deformation caused by R. That is, distortion due to deformation generated from the outer surface 120 of the crank 105 to the inner surface 119 or from the inner surface 119 to the outer surface 120 (strain generated in a direction perpendicular to the same plane as the circle defined by the rotational motion of the right crank 105R). Therefore, it is possible to detect the inward and outward strain generated in the crank 105 by detecting the bending deformation y.
- the tensile deformation z is a deformation caused by the normal force R, in which the right crank 105R is deformed so as to be extended or compressed in the longitudinal direction. That is, the strain due to the deformation generated in the direction in which the crank 105 is pulled or pushed in the longitudinal direction (strain generated in the direction parallel to the longitudinal direction) is detected. The strain in the tensile direction can be detected.
- the torsional deformation rz is a deformation caused by the tangential force T, in which the right crank 105R is deformed so as to be twisted. That is, distortion due to deformation generated in the direction in which the crank 105 is twisted is detected, and distortion in the torsion direction generated in the crank 105 can be detected by detecting the torsional deformation rz.
- the deformation directions of the bending deformation x, the bending deformation y, the tensile deformation z, and the torsional deformation rz are indicated by arrows. However, as described above, each deformation may occur in the direction opposite to the arrow. .
- the measurement module strain detection circuit 365 is arranged as shown in FIG. 4 and connected to the first strain gauge 369a, the second strain gauge 369b, the third strain gauge 369c, and the fourth strain gauge 369d as shown in FIG.
- a method for detecting (measuring) the bending deformation x, the bending deformation y, the tensile deformation z, and the torsional deformation rz will be described.
- the right crank 105R is deformed from the upper surface 117 toward the lower surface 118 or in the opposite direction.
- the fifth strain gauge 369e is compressed to decrease the resistance value
- the sixth strain gauge 369f is expanded to increase the resistance value to increase the t output, or the fifth strain gauge.
- 369e is expanded to increase the resistance value
- the sixth strain gauge 369f is compressed to decrease the resistance value and to decrease the t output (determined by the direction of deformation).
- the second detection circuit 373b only bends the third strain gauge 369c and the fourth strain gauge 369d, does not compress or expand, and the resistance value does not change, so the r output does not change. As shown in FIG.
- the first detection circuit 373a determines whether both the fifth strain gauge 369e and the sixth strain gauge 369f are expanded to increase the resistance value, or both are compressed to decrease the resistance value of both. As a result, the t output does not change.
- the third strain gauge 369c is expanded and the resistance value is increased, the fourth strain gauge 369d is compressed and the resistance value is decreased and the r output is decreased, or the third strain gauge 369c is compressed. As a result, the resistance value decreases, the fourth strain gauge 369d is expanded, the resistance value increases, and the r output increases.
- the third detection circuit 373c is configured such that both the first strain gauge 369a and the second strain gauge 369b are expanded to increase the resistance value, or both are compressed to decrease the resistance value. As a result, the k output does not change.
- the tensile deformation z deforms so that the right crank 105R is stretched or compressed in the longitudinal direction.
- the first detection circuit 373a determines whether both the fifth strain gauge 369e and the sixth strain gauge 369f are expanded to increase the resistance value, or both are compressed to decrease the resistance value of both. As a result, the t output does not change.
- the third strain gauge 369c is expanded and the resistance value is increased, the fourth strain gauge 369d is compressed and the resistance value is decreased and the r output is decreased, or the third strain gauge 369c is compressed. As a result, the resistance value decreases, the fourth strain gauge 369d is expanded, the resistance value increases, and the r output increases.
- the third detection circuit 373c is configured such that both the first strain gauge 369a and the second strain gauge 369b are expanded to increase the resistance value, or both are compressed to decrease the resistance value. As a result, the k output does not change.
- the twist deformation rz deforms so that the right crank 105R is twisted.
- the fifth strain gauge 369e is expanded and the resistance value increases, but the resistance value does not change because the sixth strain gauge 369f is neither compressed nor expanded, so the t output decreases.
- the third strain gauge 369c is expanded to increase the resistance value, but the fourth strain gauge 369d is neither compressed nor expanded, so the resistance value does not change, so the r output decreases.
- the first strain gauge 369a is compressed to decrease the resistance value
- the second strain gauge 369b is expanded to increase the resistance value and the k output is increased, or the first strain gauge 369a is expanded.
- the resistance value increases, the second strain gauge 369b is compressed, the resistance value decreases, and the k output decreases.
- the bending deformation x can be detected by detecting the change in the t output of the first detection circuit 373a
- the bending deformation y and the tensile force can be detected by detecting the change in the r output of the second detection circuit 373b.
- the deformation z can be detected.
- the torsional deformation rz can be detected by detecting a change in the k output of the third detection circuit 373c. That is, the fifth strain gauge 369e and the sixth strain gauge 369f constituting the first detection circuit 373a are the first strain gauge section, and the first strain gauge 369a and the second strain gauge 369b constituting the third detection circuit 373c are the second. It becomes the strain gauge part.
- the t output of the first detection circuit 373a and the k output of the third detection circuit 373c represent the output values of the strain detection means.
- the measurement module control unit 351 calculates the tangential force T, normal force R, and torsion torque K.
- the torsional torque is a torque when a torsional deformation rz occurs in the crank 105, that is, a torque that acts in a direction in which the crank 105 is twisted.
- a matrix A is assumed as in the following equation (1).
- t represents the t output
- r represents the r output
- k represents the actually measured value (voltage value) of the k output.
- T represents a tangential force T
- R represents a normal force R
- K represents a torsion torque K.
- FIG. 8 a state in which the crank 105 is horizontally directed forward and a known load W is applied to a position on the pedal 103 that is a distance L1 away from the center axis C1 of the crank 105 (first state). If t output, r output, and k output at tp are tp, rp, and kp, respectively, equation (1) is expressed as equation (2).
- FIG. 8A is a view seen from the upper surface 117 of the crank 105
- FIG. 8B is a view seen from the outer surface 120 of the crank.
- FIG. 9 the crank 105 is horizontally directed forward, and a known load W is applied to a position on the pedal 103 that is separated from the center axis C1 of the crank 105 by a distance L2 different from the distance L1.
- equation (1) is expressed as equation (3).
- FIG. 9A is a view seen from the upper surface 117 of the crank 105
- FIG. 9B is a view seen from the outer surface 120 of the crank.
- Equation (1) is expressed as Equation (4).
- 10A is a view as seen from the upper surface 117 of the crank 105
- FIG. 10B is a view as seen from the outer surface 120 of the crank.
- the components a to i of the matrix A are calculated from the equations (2) to (4). From the expressions (2) and (3), the components c, a, f, d, i, and g are expressed by the following expressions (5) to (10). From the equation (4), the components b, e, and h are then represented by the equations (11) to (13).
- the components remain in the equations (6), (8), and (10), this may be substituted for the calculated components.
- the calculation result of the formula (5) is substituted for the component c of the formula (6).
- an expression may be substituted instead of the calculation result.
- the components a to i of the matrix A are calculated from the values of the t output, the r output, and the k output in the states of FIGS. 8 to 10, the known load W, and the known distances L1 and L2. .
- an inverse matrix A ⁇ 1 of the calculated matrix A is calculated, and a tangential force T, a normal force R, and a torsion torque K are calculated by the following equation (14). Therefore, by calculating the inverse matrix A ⁇ 1 in advance, the tangential force T, normal force R, and torsion torque K can be calculated in real time from the values of t output, r output, and k output.
- the equation (14) can be expressed by a polynomial having a component of the inverse matrix A ⁇ 1 as a coefficient, the tangential force T and the torsion torque K are t outputs output from the first detection circuit 373a to the third detection circuit 373c, It is calculated by substituting the r output and k output into a predetermined polynomial.
- the distance L is calculated from the calculated tangential force T and torsion torque K from the central axis of the crank 105 to the center of the load applied to the pedal 103 by the driver.
- the center of the load means a point where the load acts on each part of the pedal 103 when the load is represented by a single force.
- the calculated distance L is the load center position applied to the pedal 103.
- the cycle computer 201 includes a cycle computer display unit 203, a cycle computer operation unit 205, a cycle computer cadence wireless reception unit 207, a cycle computer wireless reception unit 209, a cycle computer timer 261, and a cycle computer storage unit 253. And a cycle computer control unit 251.
- the cycle computer display unit 203 displays various types of information based on user instructions and the like.
- the propulsive force (tangential force T) and the loss force (normal force R) are visualized and displayed. Any visualization method may be used.
- the visualization method in the cycle computer display unit 203 can be, for example, vector display, graph display, color-coded display, symbol display, three-dimensional display, and any method. Also, a combination thereof may be used.
- the cycle computer display unit 203 visualizes and displays the load center position applied to the pedal 103 calculated by the measurement module control unit 351.
- FIG. 11 shows a display example.
- FIG. 11 shows the load center positions detected for the left and right pedals 103 side by side on the screen.
- the load center position detected by the right pedal 103R is displayed as an actual measurement value LMR
- the load center position detected by the left pedal 103L is displayed as an actual measurement value LML.
- the load center position set in advance as a reference is displayed as a reference value LRR (right side) and a reference value LRL (left side) superimposed on the actual measurement values LMR and LML.
- the reference values LRR and LRL are indicated as, for example, recommended pedal positions (positions where a load is to be applied). That is, the actual measurement values LMR and LML and the reference values LRR and LRL are displayed (output) in a comparable manner.
- the reference values LRR and LRL are approximately the center of the pedal 103, but are not limited thereto.
- the shape may be changed based on the shape of the bicycle 1 or the crank 105 or the physique of the driver.
- the actual measurement values LMR and LML are filled with an ellipse, and the reference values LRR and LRL are displayed with an ellipse (broken line), so that it is easy to visually recognize the superimposed values.
- the actual measurement values LMR, LML, and reference values LRR, LRL are not limited to the shape shown in FIG. 11, but may be points, circles, straight lines, foot shapes, or the like.
- the actual measurement values LMR and LML and the reference values LRR and LRL are not limited to being filled and broken lines, but may be any display form that can be distinguished from each other.
- the actual measurement value and the reference value are shown as an image. Further, actual measurement values for an arbitrary period may be stored and displayed so that the transition of position movement can be understood.
- the cycle computer operation unit 205 receives a user instruction (input). For example, the cycle computer operation unit 205 receives a display content instruction from the user on the cycle computer display unit 203.
- the cycle computer cadence wireless reception unit 207 receives cadence information transmitted from the cadence sensor 501.
- the cycle computer wireless reception unit 209 receives the propulsive force and loss transmitted from the measurement module 301, the position under load applied to the pedal 103, and the like.
- the cycle computer timer 261 is a timer counter and counts the timer.
- the timer value information generated by the cycle computer timer 261 is used in various ways by the cycle computer control unit 251 and the like.
- the cycle computer storage unit 253 includes a cycle computer RAM 255 and a cycle computer ROM 257.
- the cycle computer ROM 257 stores various parameters, constants, and the like for converting the control program, propulsive force, loss force, or load center position into data that is visually displayed on the cycle computer display unit 203.
- the cycle computer control unit 251 comprehensively controls the cycle computer 201. Further, the cadence sensor 501 and the measurement module 301 may be comprehensively controlled. The cycle computer control unit 251 converts the propulsive force, loss force, or load center position into data that is visually displayed on the cycle computer display unit 203.
- step ST51 the cadence sensor control unit 551 of the cadence sensor 501 detects a change of the magnetic sensor 505 to ON.
- the cadence sensor control unit 551 detects a change in the magnetic sensor 505
- the cadence sensor control unit 551 interrupts the process, and starts the processes after step ST53. Interruption means to interrupt a process so far and execute a specified process.
- the cadence sensor control unit 551 calculates a cadence value.
- the cadence sensor control unit 551 calculates the time (period) [seconds] at which the magnetic sensor 505 is turned on by multiplying the count value (C) of the timer value information by one count interval (T). Then, the cadence sensor control unit 551 calculates cadence [rpm] by dividing 60 by this time (cycle). Further, the cadence sensor control unit 551 stores the cadence information in the cadence sensor RAM 555 of the cadence sensor storage unit 553.
- step ST55 the cadence sensor control unit 551 outputs a counter value reset command to the cadence sensor timer 561.
- the main flow of control of the cadence sensor control unit 551 is completed.
- the interruption is performed again, and the process is restarted from step ST51.
- the cadence sensor control unit 551 transmits the cadence information stored in the cadence sensor storage unit 553 to the cycle computer 201 using the cadence sensor wireless transmission unit 507.
- the transmission may be performed only by the cadence sensor wireless transmission unit 507 without using the cadence sensor control unit 551.
- step ST59 the cadence sensor control unit 551 waits for one second.
- the wait time is variable.
- step ST11 the measurement module A / D 363 A / D converts the output (t output, r output, k output) from the measurement module strain detection circuit 365 from an analog value to a digital value.
- step ST13 strain information detected (converted) by the measurement module A / D 363 is stored in the measurement module RAM 355 of the measurement module storage unit 353.
- step ST15 the process waits for 1 / N seconds.
- the value of N is the number of data points measured per second. That is, the larger the value of N, the greater the number of strain information and the higher the resolution in seconds. The larger the N value, the better.
- the N value can be determined by the cost, the required time resolution, the time required for the measurement module A / D 363 to perform A / D conversion, and the like.
- the measurement module control unit 351 performs the process of FIG. In step ST31, the measurement module control unit 351 saves the strain information data.
- the capacity of the measurement module RAM 355 in the measurement module storage unit 353 is limited.
- the capacity of the measurement module RAM 355 is increased, it is not necessary to save the strain information data.
- designing with a sufficient margin increases the cost and is not appropriate.
- strain information is written successively one after another, if data is not saved, new information is overwritten before the tangential force T, normal force R, and distance L are calculated by processing in step ST33 described later. It is because there is a risk of being done.
- step ST35 the measurement module control unit 351, via the measurement module wireless transmission unit 309, calculates the tangential force T and normal force R or average tangential force and average normal force, distance L, Send.
- the transmitted tangential force T, normal force R, and the like and the distance L are received by the cycle computer radio reception unit 209 of the cycle computer 201. That is, information on the center position of the load applied to the pedal 103 connected to the crank 105 is output based on the tangential force T calculated based on the output value of the strain gauge 369 and the torsion torque K. .
- step ST37 1 second is waited.
- One second is an example and can be changed as necessary.
- the process returns to step ST31 again. That is, the processing of step ST31 to step ST35 is repeated once per second.
- step ST71 when the cycle computer control unit 251 receives the propulsive force (tangential force T), the loss force (normal force R), the load center position (distance L), and cadence information, an interruption is performed. That is, when the cycle computer control unit 251 detects that the cycle computer wireless reception unit 209 has received propulsive force, loss force, load center position, and cadence information, the cycle computer control unit 251 interrupts the processing up to that point ( Interrupt) to start the processing from step ST73.
- the cycle computer control unit 251 interrupts the processing up to that point ( Interrupt) to start the processing from step ST73.
- step ST73 the cycle computer control unit 251 causes the cycle computer display unit 203 to display propulsive force, loss force, load center position, and cadence information. That is, this step functions as an output process.
- the cycle computer display unit 203 displays these pieces of information as numerical values or transmits them to the user by other visualization, hearing, or tactile methods. These pieces of information need not be displayed at the same time, and may be displayed individually by a switching operation by a user or the like.
- step ST75 the cycle computer control unit 251 stores the propulsive force, loss force, load center position, and cadence information in the cycle computer display unit 203 in the cycle computer RAM 255 of the cycle computer storage unit 253. Thereafter, the cycle computer control unit 251 performs other processes until the interrupt of step ST51 is performed again.
- the load center position (distance L) is calculated by the measurement module 301, but instead of the load center position (distance L), the torsion torque K is transmitted to the cycle computer 201, and the cycle computer 201
- the load center position (distance L) may be calculated as follows.
- the strain gauge 369 is provided on the inner surface 119 of the crank 105 of the bicycle 1 and detects the strain generated in the crank 105.
- the cycle computer display unit 203 is connected to the crank 105 on the basis of the tangential force T and the torsion torque K calculated based on the output values of the first strain gauge 369a to the sixth strain gauge 369f.
- An image indicating the load center position applied to the pedal 103 is displayed. By doing so, an image indicating the load center position applied to the pedal 103 can be calculated and output, so that efficient pedaling and the like can be performed based on this information.
- strain gauges 369 are respectively provided on the inner surfaces 119 of the cranks 105 provided in the left and right pairs of the bicycle 1, and the cycle computer display unit 203 indicates the center position of the load applied to the pedals 103 connected to the left and right cranks 105.
- the images are displayed side by side.
- the cycle computer display unit 203 displays an image in which the reference values LRR and LRL are previously superimposed on the actual measurement values LMR and LML detected by the strain gauge 369.
- the strain gauge 369 includes a first strain gauge 369a and a second strain gauge 369b that detect a bending deformation x generated in the crank 105, a fifth strain gauge 369e that detects a torsional deformation rz generated in the crank 105, and a sixth strain gauge. 369f, and a plurality of strain gauges.
- the strain gauge 369 is a voltage corresponding to the amount of deformation of the crank 105 in the direction in which the first strain gauge 369a and the second strain gauge 369b, the fifth strain gauge 369e and the sixth strain gauge 369f detect the strain. The value is output. By doing so, the tangential force T and the torsion torque K of the crank 105 can be calculated from the output voltage values of the plurality of strain gauges 369.
- the tangential force T and the torsional torque K of the crank 105 are constituted by a third detection circuit 373c constituted by a first strain gauge 369a and a second strain gauge 369b, and a fifth strain gauge 369e and a sixth strain gauge 369f.
- the first detection circuit 373a calculates the voltage value (t output, k output) output from the first detection circuit 373a into a predetermined polynomial. By doing in this way, it is computable by calculation using CPU etc., for example.
- the coefficient of each term of the predetermined polynomial is the first coefficient applied to the crank 105 in the first state in which a predetermined load W is applied to the position on the pedal 103 that is separated from the central axis of the crank 105 by the first distance L1.
- It is preset based on the t output and the k output in each of the first state and the second state.
- the coefficient can be calculated in advance based on the first reference torsion torque P, the second reference torsion torque Q, and the output voltage values (tp, kp, tq, kq) that can be calculated with known numerical values. it can. Therefore, the tangential force T of the crank 105 and the torsion torque K of the crank 105 can be calculated simply by substituting the values actually measured by the first detection circuit 373a and the third detection circuit 373c into the polynomial. In addition, since the coefficient can be changed according to the crank, it can be calculated accurately for each crank.
- the measurement module strain detection circuit 365 of the present embodiment does not have the second detection circuit 373b.
- the r output of the second detection circuit 373b detects the bending deformation y and the tensile deformation z as described in the first embodiment. These are deformations caused by the normal force R, and may not be detected when the normal force R is not calculated.
- the expression (1) shown in the first embodiment is the following expression (15)
- the expression (2) is the following expression (16)
- the expression (3) is the following expression (17)
- the expression (14) is changed to the following expression (18).
- the components of the matrix A are in the first reference torsion torque P, the second reference torsion torque Q, and the first state and the second state, respectively. It can be calculated based on t output and k output.
- the number of strain gauges can be reduced. Further, since the polynomial terms for calculating the tangential force T and the torsional torque K are reduced, the amount of calculation can be reduced.
- the cycle computer display unit 203 has been described as an output unit.
- the output unit is not limited to a unit that transmits information to the driver by display or voice.
- a cycle computer external communication unit 271 is added to the cycle computer 201 to cycle information such as the distance L from the center axis of the crank 105 to the center of the load applied to the pedal 103 by the driver.
- You may make it output from the computer external communication part 271 to the server S connected via the public lines N, such as the internet.
- the output means is the cycle computer external communication unit 271.
- the data may be output from the measurement module 301 to the server S connected directly via the public line N.
- the strain gauge 369 is described as being provided near the center of the crank 105, but may be provided near the pedal 103 or the crankshaft 107.
- the strain of the crank 105 is small, so that the life of the strain gauge 369 can be extended. If it is provided near the crankshaft 107, the output of the strain gauge 369 is increased by this principle, and the influence of noise can be reduced.
- the information output device is composed of the cycle computer 201 and the measurement module 301.
- the information output device in the present invention is a part of the cycle computer 201 or the measurement module 301.
- a device other than the strain gauge 369 (measurement module strain detection circuit 365) may be a device in a completely different place through communication.
- the human-powered machine in the present invention means a machine driven by human power equipped with a crank 105 such as a bicycle 1 or a fitness bike.
- a crank 105 such as a bicycle 1 or a fitness bike.
- any human-powered machine may be used as long as it is a machine that is driven by a human power equipped with the crank 105 (it is not always necessary to move locally).
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Abstract
Description
103 ペダル
105 クランク
119 内面(側面)
203 サイクルコンピュータ表示部(出力手段)
271 サイクルコンピュータ外部通信部(出力手段)
369a 第1ひずみゲージ(ひずみ検出手段、第2ひずみゲージ部)
369b 第2ひずみゲージ(ひずみ検出手段、第2ひずみゲージ部)
369c 第3ひずみゲージ
369d 第4ひずみゲージ
369e 第5ひずみゲージ(ひずみ検出手段、第1ひずみゲージ部)
369f 第6ひずみゲージ(ひずみ検出手段、第1ひずみゲージ部)
373a 第1検出回路
373b 第2検出回路
373c 第3検出回路
C1 中心軸
K ねじれトルク(クランクにねじれを生じさせる方向に働くトルク)
L ペダルに加えている荷重の中心まで距離(ペダルに加えられた荷重の中心位置に関する情報)
P 第1基準ねじれトルク
Q 第2基準ねじれトルク
T 接線力(クランクの回転運動により定義される円の接線方向に働く力)
ST33 接線力、荷重中心位置までの距離算出(算出工程)
ST73 データの表示(出力工程)
Claims (9)
- 人力機械のクランクの側面に設けられ、前記クランクに生じるひずみを検出するひずみ検出手段と、
前記ひずみ検出手段の出力値に基づいて算出された、前記クランクの回転運動により定義される円の接線方向に働く力と、前記クランクにねじれを生じさせる方向に働くトルクと、に基づいて、前記クランクに連結されたペダルに加えられた荷重の中心位置に関する情報を出力する出力手段と、
を備えることを特徴とする情報出力装置。 - 前記ひずみ検出手段は、前記人力機械が左右一対に備える前記クランクの側面にそれぞれ設けられ、
前記出力手段は、左右それぞれの前記クランクに連結された前記ペダルに加える前記荷重の中心位置に関する情報を並べて表示されるように出力する、
ことを特徴とする請求項1に記載の情報出力装置。 - 前記出力手段は、前記ひずみ検出手段が検出した前記ペダルに加えられた荷重の中心位置と予め基準として設定された荷重の中心位置とを比較可能な態様で出力することを特徴とする請求項1または2に記載の情報出力装置。
- 前記ひずみ検出手段は、前記クランクに生じる前記接線方向へ変形するひずみを検出する第1ひずみゲージ部と、前記クランクに生じる当該クランクのねじれ方向へ変形するひずみを検出する第2ひずみゲージ部と、を含む複数のひずみゲージ部を有し、
前記複数のひずみゲージ部は、それぞれのひずみゲージ部がひずみを検出する方向への前記クランクの変形量に応じた電圧値を出力する、
ことを特徴とする請求項1乃至3のうちいずれか一項に記載の情報出力装置。 - 前記クランクの回転運動により定義される円の接線方向に働く力及び前記クランクにねじれを生じさせる方向に働くトルクは、前記複数のひずみゲージ部が出力する電圧値を所定の多項式に代入することにより算出されることを特徴とする請求項4に記載の情報出力装置。
- 前記所定の多項式の各項の係数は、
前記クランクの中心軸から第1距離だけ離れた前記ペダル上の位置に予め定めた荷重を加えた第1状態において、前記クランクに加わる第1基準ねじれトルクと、
前記クランクの中心軸から前記第1距離とは異なる第2距離だけ離れた前記ペダル上の位置に前記予め定めた荷重を加えた第2状態において、前記クランクに加わる第2基準ねじれトルクと、
前記第1状態及び第2状態のそれぞれにおいて前記複数のひずみゲージ部が出力する電圧値と、
に基づいて予め設定されていることを特徴とする請求項5に記載の情報出力装置。 - 人力機械のクランクの側面に設けられ、前記クランクに生じるひずみを検出するひずみ検出手段を備える情報出力装置により実行される情報出力方法であって、
前記クランクの回転運動により定義される円の接線方向に働く力と、前記クランクにねじれを生じさせる方向に働くトルクと、を前記ひずみ検出手段の出力値に基づいて算出する算出工程と、
前記算出工程で算出された前記クランクの回転運動により定義される円の接線方向に働く力と、前記クランクにねじれを生じさせる方向に働くトルクと、に基づいて、前記クランクに連結されたペダルに加えられた荷重の中心位置に関する情報を出力する出力工程と、
を含むことを特徴とする情報出力方法。 - 請求項7に記載の情報出力方法を、コンピュータにより実行させることを特徴とする情報出力プログラム。
- 請求項8に記載の情報出力プログラムを格納したことを特徴とするコンピュータ読み取り可能な記録媒体。
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