JP4691532B2 - Vehicle throttle device - Google Patents

Description

  The present invention relates to a vehicle equipped with an engine and equipped with a steering handlebar, and more particularly to a vehicle throttle device in which a throttle grip is rotatably provided at an end portion of a handlebar like a motorcycle. .

  In a vehicle such as a motorcycle equipped with an engine and a handlebar, a conventional throttle device includes a throttle valve in a throttle body (or carburetor) arranged in an intake passage, and a throttle grip provided on the handlebar. The reel is coupled to the reel by a wire cable, and the rotation of the throttle grip is transmitted to the throttle valve via the wire cable, and the throttle opening is adjusted to control the intake air amount. .

  In addition, when the engine is equipped with a fuel injection device, a rotation angle sensor is attached to the throttle valve built in the throttle body, and the throttle valve opening is detected and the throttle opening is The fuel injection amount and ignition timing are adjusted.

  In the case of a wire cable system in which rotation of the throttle grip is transmitted to the throttle valve by a wire cable, the wire cable is arranged while avoiding other mounted parts from the handlebar throttle grip to the engine carburetor during manufacturing and assembly. In addition, it is necessary to adjust the tension of the wire cable to a predetermined value, and the assembling work is troublesome.

  In addition, although it occurs at the connecting portion between the wire cable and the reel of the throttle grip, it is necessary to adjust the tension of the wire cable according to the extension of the wire cable due to use, and maintenance is troublesome.

  In the wire cable system, the tension of the wire cable is applied to the throttle grip, and this tension increases as it rotates in the throttle valve opening direction, which increases the operating force of the throttle grip.

(Object of invention)
An object of the present invention is to provide a throttle device that has better assembly workability, is easier to maintain, does not become heavy in the operation of the throttle grip, and has good responsiveness as compared with a wire cable type throttle device.

In order to solve the above-described problems, the present invention provides a vehicle throttle device that includes an engine and a steering handlebar, and a throttle grip is rotatably provided at one end of the handlebar. A throttle valve disposed in the intake path, a stepping motor that drives the throttle valve, and a rotation angle of the throttle grip are detected, and a pulsed rotation angle detection signal is output according to the rotation amount of the throttle grip. A rotation angle sensor, electrically connected to the rotation angle sensor and the stepping motor, sends a drive signal to the stepping motor based on the rotation angle detection signal, and opens the throttle valve according to the rotation angle detection signal. degrees modulate, and an electronic control unit for engine control, the throttle Gris The reel has a reel integrally on the inner end surface in the vehicle width direction, and a return coil spring for biasing the reel toward the throttle closing side is provided between the rotation angle sensor and the sensor housing for housing the reel and the reel. One end of the return coil spring is engaged with the reel, the other end is engaged with the sensor housing and connected to one of the rotation angle sensor lead wires, and a contact board is formed on the inner surface of the sensor housing. The reel is provided with a contact plate that contacts the contact substrate, the contact plate is connected to one lead wire via a return coil spring, and the contact substrate is connected to the remaining lead wire for the rotation angle sensor. Connected .

In the vehicle throttle device, the contact board and the contact plate are preferably configured as follows (a) or (b).

  (A) The contact board is fixed to the inner surface of the end wall of the sensor housing in the grip axis direction, and the contact plate protrudes from the reel in the grip axis direction and contacts the contact board.

(B) The contact board is fixed to a cylindrical inner surface of the sensor housing, and the reel contact plate protrudes radially outward from the reel and contacts the contact board.

(1) By adopting an electronically controlled throttle system that uses a rotation angle sensor that generates a step-like rotation angle detection signal, the responsiveness of the throttle valve to the operation of the throttle grip is improved, fuel efficiency is improved and exhaust is improved. Effective for gas countermeasures.

(2) It is necessary to adjust the tension of the wire cable as in the conventional wire cable type by detecting the rotation angle of the throttle grip with a rotation angle sensor and adjusting the throttle opening based on the detected rotation angle. Maintenance is easy.

(3) A rotation angle sensor is disposed in the vicinity of the throttle grip provided on the handlebar, and the rotation angle sensor and the stepping motor for driving the throttle valve are electrically connected to the electronic control unit by lead wires or the like. The wire cable from the throttle grip to the throttle valve or the electronic control unit is not necessary, and the assembling workability is improved. Further, the operating force of the throttle grip is not increased as in the case of the wire cable system.

[First Embodiment]
FIG. 1 is a plan view of a handlebar of a motorcycle equipped with a throttle device according to the present invention. The handlebar 1 includes a handle main body 2 fixed to a front wheel steering shaft 4 and left and right ends of the handle main body 1. It is composed of a fixed cylindrical pipe 3. The handle body 2 is connected to a front axle (not shown) via a pair of left and right front forks 5 and rotates around the axis of the steering shaft 4 together with the front wheels. Although the basic structure of the entire motorcycle is well known, it does not need to be illustrated in particular. However, the engine is mounted on the body frame, the front wheel and the rear wheel are provided, and the steering handlebar is disposed above the front wheel. 1 and a fuel tank and a seat above the body frame.

  A handle grip 7 is fixed to the left cylindrical pipe 3, and a switch case 10 having a direction indicator switch 8 and the like and a clutch lever 11 are attached. A throttle grip 15 is rotatably fitted to the right cylindrical pipe 3, and a switch case 19 having a start switch 16 and a horn switch 17 and a brake lever 20 are attached. A rotation angle sensor 38 is disposed at the inner end (left side) of the throttle grip 15 in the vehicle width direction. The rotation angle sensor 38 is housed in a sensor housing 22 fixed to the right cylindrical pipe 3. Antivibration weights 21 are attached to the tip portions of the left and right cylindrical pipes 3.

  A throttle body 24 of the fuel injection device is connected to an intake path from the air cleaner 28 to the intake port 29 of the engine, and a throttle valve 26 is rotatably disposed in the intake passage of the throttle body 24. A rotary shaft 26a of the throttle valve 26 is linked to an output shaft of a throttle valve drive motor (stepping motor) 27 attached to the outside of the throttle body 24. The throttle valve drive motor 27 rotates the throttle valve 26, The throttle opening is adjusted. Although not shown, a return spring that urges the throttle valve 26 toward the closed position is mounted in the throttle body 24.

  The throttle valve drive motor 27 is connected to an engine electronic control unit (ECU) 35 via a lead wire 33, and the electronic control unit 35 includes a rotation speed sensor (not shown) and a temperature sensor (not shown). The rotation angle sensor 38 is connected via a pair of lead wires 39 and 40 in the same manner as various engine condition measurement sensors such as).

  FIG. 2 is an enlarged front view (corresponding to II-II cross section of FIG. 3) of the rotation angle sensor 38 shown in a state where the sensor housing 22 is cut. In FIG. While being rotatably fitted to the outer periphery of the pipe 3, a reel 42 is integrally provided on the inner side (left side) end surface in the vehicle width direction. This reel 42 uses a reel used for winding a wire cable in the conventional wire cable system as it is, and is housed in the sensor housing 22.

  Between the reel 42 and the left end wall of the sensor housing 22, a return coil spring 45 that biases the reel 42 toward the arrow C side (throttle closing side) is interposed. One end of the return coil spring 45 is engaged with an engagement hole 50 formed in the reel 42 via an insulating material, and the other end is engaged with an engagement hole 51 formed in the left end wall of the sensor housing 22 via an insulating material. While being engaged, it is connected to one rotation angle sensor lead wire 39.

  The rotation angle sensor 38 of the present embodiment uses a contact-type potentiometer. A contact board 55 is fixed to the inner surface of the left end wall of the housing 22 and a contact plate (sliding contact) protruding leftward from the left end surface of the reel 42. ) 56 is fixed. The contact substrate 55 is connected to the remaining lead wire 40 for the rotation angle sensor, and the contact plate 56 is always in contact with the contact substrate 55 by its own elastic force and is electrically connected to the other end of the return coil spring 45. The lead wire 39 is connected to the one lead wire 39 through a return coil spring 45. A voltage of 5 V, for example, is loaded between the lead wires 39 and 40.

  FIG. 4 is a right side view of the contact board 55. The contact board 55 has a cylindrical pipe insertion hole 60 formed in the center and an arc-shaped resistance plate 61 around the hole 60. The lead wire 40 is connected to one end of the resistance plate 61 on the arrow O side (throttle open side). As shown in FIG. 5, the resistor plate 61 is insulated from the sensor housing 22 by the insulating layer 62, and is exposed in a pulse shape on the front side (right side) at a predetermined interval in the circumferential direction. The tip is in contact.

  3 is a cross-sectional view taken along the line III-III of FIG. 2. The contact plate 56 rotates integrally with the throttle grip 15 around the grip axis, but its rotation range θ1 is the circumferential direction of the resistor plate 61 by a stopper mechanism (not shown). The resistance value of the resistance plate 61 between the contact plate 56 and the lead wire 40 decreases as the contact plate 56 rotates to the arrow O side.

  In this embodiment, the program in the electronic control unit 35 is set so that the position Pm having the smallest resistance value is the throttle maximum open position and the position P0 having the largest resistance value is the throttle minimum open position.

(Function)
In FIG. 3, when the occupant is not grasping the throttle grip 15, the contact plate 56 rotates in the direction of arrow C together with the throttle grip 15 by the biasing force of the return coil spring 45, and is located at the throttle minimum open position P0 in FIG. is doing.

  When the passenger grips the throttle grip 15 and rotates in the direction of arrow O, the contact plate 56 integrally rotates with the throttle grip 15 in the direction of arrow O, and the resistance value of the resistance plate 61 decreases. A rotation angle is detected by a change in current accompanying the decrease in the resistance value, and is sent as a rotation angle detection signal to the electronic control unit 35 of FIG.

  In the electronic control unit 35, a drive signal is sent to the stepping motor 27 based on the rotation angle detection signal, and the throttle valve 26 is opened by the stepping motor 27 according to the rotation angle of the throttle grip 15.

  If the rotation angle sensor 38 is configured using the conventional wire cable type reel and housing as in the embodiment, the conventional throttle grip, housing and reel can be used as they are, and parts management is easy. In addition, the manufacturing cost can be reduced.

[Second Embodiment]
6 and 7 show another example in which a contact-type potentiometer is used as the rotation angle sensor 38. In FIG. 6, the contact board 55 is fixed to the cylindrical inner surface of the sensor housing 22, and the reel 42 is attached to the left end surface. The fixed contact plate 56 is protruded outward in the radial direction of the reel 42 to be brought into contact with the contact substrate 55.

  FIG. 7 is a perspective view of the contact board 55, and the resistance plate 61 is exposed in a pulse shape at a predetermined interval in the circumferential direction on the radially inner circumferential surface. The other structure is the same as that of FIG.2 and FIG.3, and the same code | symbol is attached | subjected to the same components. The operation is also the same as in the case of FIGS.

[Reference example]
FIGS. 8 and 9 are reference examples, and show a non-contact rotation angle sensor 38 using an exciting coil 70 and a plurality of magnetic bodies 71. In FIG. 8, a reel for wire cable is not provided at the left end portion of the throttle grip 15, a flange 71 for board placement is fixed, and a board 73 is fixed to the left end face of the flange 71. A plurality of magnetic bodies 74 are installed on the same circumference of 73.

  The exciting coil 70 is opposed to the magnetic body 74 from the left side with a gap and is fixed to the left end wall of the sensor housing 22, and is connected to the electronic control unit 35 via a pair of lead wires 39 and 40. is doing.

  FIG. 9 shows a left side view of the substrate 73, and the plurality of magnetic bodies 74 arranged on the same circumference gradually increase the magnetic force in the circumferential direction, for example, toward the throttle closing side (arrow C side). Is configured to be stronger.

  When the substrate 73 is rotated to the arrow O side by rotating the throttle grip 15 of FIG. 8 to the arrow O side, the magnetic body 74 facing the excitation coil 70 located at the excitation coil fixing position Ps of FIG. Gradually, it is replaced with one having a larger magnetic force, and the induced current generated in the exciting coil 70 increases. The rotation angle detection signal detected by this change in current is sent to the electronic control unit 35, and the throttle valve 26 is opened by the stepping motor 27 in accordance with the rotation angle of the throttle grip 15.

(1) In the rotation angle sensors shown in FIGS. 2 and 3 and FIGS. 6 and 7, the reel used in the conventional wire cable type is used as it is, but a flange for attaching the contact plate is formed as shown in FIG. A structure is also possible.

(2) In FIG. 1, the present invention is applied to an engine having a throttle body of a fuel injection device. However, it can also be applied to an engine having a carburetor.

(3) Vehicles to which the present invention is applied are not limited to motorcycles, but are equipped with an engine and a handlebar, such as a snowmobile, a small water planing boat, or a riding-type rough terrain vehicle. The present invention can be applied to a vehicle having a throttle grip that is rotatable at the part.

[Effect of the embodiment]
In each of the above-described embodiments, by adopting the electronically controlled throttle system, the response of the throttle valve to the operation of the throttle grip is improved, and the fuel efficiency is improved and the exhaust gas countermeasure is effective. It has the following advantages.

(1) A rotation angle sensor is arranged at the end of the throttle grip provided on the handlebar, and the rotation angle sensor and the throttle valve drive motor are connected to the electronic control unit by lead wires. Thus, the wire cable wiring from the throttle grip to the throttle valve or the electronic control unit becomes unnecessary, and the assembling workability is improved. Further, the operating force of the throttle grip is not increased as in the case of the wire cable system.

(2) Since the rotation angle of the throttle grip is directly detected by the rotation angle sensor and the throttle opening is adjusted based on the detected rotation angle, it is necessary to adjust the tension of the wire cable as in the conventional wire cable type. Maintenance is easy.

(3) Although the handlebar is a member that generates a relatively large amount of vibration during traveling, the throttle grip is a member provided on the handlebar, but the vibration is suppressed by being held by the occupant. When a contact-type rotation angle sensor is provided as shown in FIGS. 2 and 3, the rotation angle sensor is arranged at the end of the throttle grip, and a contact plate (contactor) is fixed to the throttle grip. The vibration to the angle sensor is blocked, and the sensor function can be prevented from deteriorating. In addition, the rotation angle sensor can be arranged in a compact manner.

It is a top view of the handle bar which shows 1st Embodiment of this invention. FIG. 4 is a longitudinal front view of the rotation angle sensor of FIG. 1 (corresponding to II-II cross section of FIG. 3). FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a right view of a contact board. It is a VV cross-sectional enlarged view of FIG. It is a vertical front view which shows the modification of a contact-type rotation angle sensor. FIG. 7 is a perspective view of the contact board of FIG. 6. It is a vertical front view of a non-contact type rotation angle sensor. It is the left side of the board | substrate of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Handlebar 15 Throttle grip 22 Sensor housing 24 Throttle body 26 Throttle valve 27 Stepping motor 35 for driving the throttle valve Electronic control unit 38 Rotation angle sensor 39, 40 Lead wire 55 Contact board 56 Contact plate (slider)
61 Resistance plate 70 Excitation coil 73 Substrate 74 Magnetic body

Claims (3)

In a vehicle throttle device equipped with an engine and provided with a steering handlebar (1) and having a throttle grip (15) rotatably provided at one end of the handlebar (1),
A throttle valve (26) disposed in the intake path of the engine;
A stepping motor (27) for driving the throttle valve;
A rotation angle sensor (38) for detecting a rotation angle of the throttle grip (15) and outputting a pulsed rotation angle detection signal in accordance with the rotation amount of the throttle grip (15);
Electrically connected to the rotation angle sensor (38) and the stepping motor (27), a drive signal is sent to the stepping motor (27) based on the rotation angle detection signal, and the rotation angle detection signal corresponds to the rotation angle detection signal. An electronic control unit (35) for engine control that adjusts the opening of the throttle valve (26),
The throttle grip (15) has a reel (42) integrally on the inner end surface in the vehicle width direction,
A return coil spring (45) for biasing the reel (42) toward the throttle closing side between the reel (42) and a sensor housing (22) housing the rotation angle sensor (38) and the reel (42). Is intervened,
One end of the return coil spring (45) is locked to the reel (42), and the other end is locked to the sensor housing (22) to be connected to one rotation angle sensor lead wire (39),
A contact board (55) is provided on the inner surface of the sensor housing (22), and a contact plate (56) that contacts the contact board (55) is provided on the reel (42).
The contact plate (56) is connected to one lead wire (39) via a return coil spring (45), and the contact substrate (55) is connected to the remaining lead wire (40) for the rotation angle sensor. A vehicle throttle device characterized by that . The vehicle throttle device according to claim 1,
  The contact board (55) is fixed to the inner surface of the end wall in the grip axial direction of the sensor housing (22),
  The vehicle throttle device, wherein the contact plate (56) protrudes from the reel (42) in the grip axis direction and is in contact with the contact substrate (55). The vehicle throttle device according to claim 1,
  The contact board (55) is fixed to a cylindrical inner surface of the sensor housing (22),
  The reel contact plate (56) protrudes radially outward from the reel (42) and abuts against the contact board (55).

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