CN117799379B - Distributed electrically driven trailer control system and method with lifting drive axle - Google Patents
Distributed electrically driven trailer control system and method with lifting drive axle Download PDFInfo
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- CN117799379B CN117799379B CN202311790859.2A CN202311790859A CN117799379B CN 117799379 B CN117799379 B CN 117799379B CN 202311790859 A CN202311790859 A CN 202311790859A CN 117799379 B CN117799379 B CN 117799379B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008859 change Effects 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 claims description 64
- 230000035939 shock Effects 0.000 claims description 19
- 239000006096 absorbing agent Substances 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 11
- 239000010720 hydraulic oil Substances 0.000 claims description 5
- 238000005381 potential energy Methods 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 2
- 238000005562 fading Methods 0.000 abstract description 2
- 230000005284 excitation Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
- B60G17/017—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their use when the vehicle is stationary, e.g. during loading, engine start-up or switch-off
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
- B60G15/08—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring
- B60G15/12—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring and fluid damper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
- B60G17/0152—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the action on a particular type of suspension unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
- B60G17/019—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the type of sensor or the arrangement thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
- B60G2202/10—Type of spring
- B60G2202/15—Fluid spring
- B60G2202/152—Pneumatic spring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
- B60G2202/20—Type of damper
- B60G2202/24—Fluid damper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2300/00—Indexing codes relating to the type of vehicle
- B60G2300/04—Trailers
- B60G2300/042—Semi-trailers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
- B60G2400/25—Stroke; Height; Displacement
- B60G2400/252—Stroke; Height; Displacement vertical
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2500/00—Indexing codes relating to the regulated action or device
- B60G2500/30—Height or ground clearance
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention discloses a distributed electrically driven trailer control system with a lifting drive axle and a method thereof, relating to the technical field of trailers, and comprising a brake pedal position sensor, a tractor front axle height sensor, a tractor front axle body, a tractor frame, a hydraulic pump and a hydro-pneumatic spring drive axle controller; according to the distributed electrically-driven trailer control system and method with the lifting drive axle, when the lifting axle is lifted and the brake pedal is in a certain opening range for a long time, in order to prevent a heat fading phenomenon of a brake, the lifting axle can be put down, wheels at two ends of the lifting axle participate in braking, and the running resistance of the whole vehicle is increased, so that the braking performance and safety of the whole vehicle are improved; when the lifting bridge is lifted and passes through the obstacle, the vertical distance between the lifting bridge and the obstacle can be calculated through the height change of the front axle of the tractor, and when the distance is too small, the lifting bridge is put down, so that the damage of the obstacle to the lifting bridge caused by impact is prevented, and the reliability of the lifting bridge is improved.
Description
Technical Field
The invention relates to the technical field of trailers, in particular to a distributed electrically-driven trailer control system with a lifting drive axle and a method thereof.
Background
At present, the domestic airbag type lifting bridge system is widely applied to engineering practice, is easy to damage in the use process due to the structural characteristics of an airbag, and is low in deflation speed and complex in overall structure. By virtue of the progress of the automobile electronic technology and the hydraulic control technology, the hydro-pneumatic suspension has been widely applied to various vehicles due to the advantages of high stability, high self-adaptability, low noise, low vibration, small required arrangement space and the like.
The existing control method for lifting the air bag bridge mainly focuses on controlling lifting of the lifting bridge according to load change when a vehicle runs, and improving the skidding condition of wheels by controlling lifting of the lifting bridge. Although the control methods can realize automatic lifting of the lifting air bag bridge according to the real-time working condition, the defects that the air bag deflating speed is low and the vehicle cannot be controlled in time are overcome. When the vehicle brakes on a long downhill, if the lifting bridge is lifted, the braking effect can be affected, and then dangerous working conditions occur. Meanwhile, when the lifting bridge is lifted, if the lifting bridge touches a higher obstacle, the lifting mechanism is damaged. A distributed electrically driven trailer control system and method with a lift drive axle is therefore presented.
Disclosure of Invention
In order to achieve the above purpose, the invention is realized by the following technical scheme: a distributed electrically driven trailer control system with a lifting drive axle comprises a brake pedal position sensor, a tractor front axle height sensor, a tractor front axle body, a tractor frame, a hydraulic pump, a hydro-pneumatic spring drive axle controller, a hydro-pneumatic spring drive axle height sensor, a hydro-pneumatic spring drive axle assembly, a trailer frame, a right accumulator, a right electromagnetic valve, a left accumulator and a cab, wherein the cab is arranged at the top of the tractor frame, the brake pedal position sensor is assembled in the cab, the tractor front axle height sensor is assembled on the tractor front axle body, the hydraulic pump is assembled outside the trailer frame, the hydro-pneumatic spring drive axle controller is assembled inside the tractor frame, the hydro-pneumatic spring drive axle assembly is assembled on the trailer frame through a lifting lug, the right accumulator and the left accumulator are assembled on the trailer frame, and the right electromagnetic valve and the left electromagnetic valve are assembled on the trailer frame.
Optionally, the hydro-pneumatic spring transaxle assembly includes left motor assembly, left bumper shock absorber, axle housing, right bumper shock absorber, right motor assembly, right double-acting cylinder, v type thrust rod, left double-acting cylinder, right connecting rod A, right connecting rod B, right connecting rod C, left connecting rod A, left connecting rod B and left connecting rod C, the left side of axle housing installs left motor assembly, the right side of axle housing is equipped with right motor assembly, the right flank of trailer frame is equipped with right double-acting cylinder, the left flank of trailer frame is equipped with left double-acting cylinder, v type thrust rod is located between right double-acting cylinder and the left double-acting cylinder, right connecting rod C is installed on the right side of trailer frame, below and be located right connecting rod C's front end and be equipped with right connecting rod A, right connecting rod C's one end is connected with right connecting rod C's one end, right bumper shock absorber is installed on the right side of trailer frame, the left side of double-acting cylinder is equipped with left side of the left side of trailer frame, the left side of double-acting cylinder is located right connecting rod B, the left end of the left side of trailer frame is connected with left bumper shock absorber B, the left side of the trailer frame is installed, the left end of the left side of the left bumper shock absorber is installed.
Optionally, the brake pedal position sensor is configured to acquire brake pedal position information in real time; the front axle height sensor of the tractor is used for acquiring the vertical distance between the upper surface of the front axle body of the tractor and the lower wing surface of the frame of the tractor in real time.
Optionally, the hydraulic pump is used for providing power for the right double-acting oil cylinder and the left double-acting oil cylinder; the hydro-pneumatic spring drive axle height sensor is used for measuring the distance between the upper surface of the hydro-pneumatic spring drive axle assembly and the lower wing surface of the trailer frame.
Optionally, the right accumulator and the left accumulator are used for respectively converting fluid energy in the right double-acting oil cylinder and the left double-acting oil cylinder into elastic potential energy and absorbing and buffering impact energy.
Optionally, the right electromagnetic valve and the left electromagnetic valve are assembled on the trailer frame, and the flow direction of hydraulic oil in the right double-acting oil cylinder and the left double-acting oil cylinder is controlled respectively by switching different loops, so as to control the lifting of the liftable hydro-pneumatic spring drive axle assembly.
A method of controlling a distributed electrically driven trailer having a lift drive axle, comprising the steps of:
Step one: when a driver starts the vehicle and does not drive, the front axle height sensor of the tractor measures the vertical distance A between the front axle body of the tractor and the lower wing surface of the frame of the tractor, the height sensor of the hydro-pneumatic spring drive axle measures the vertical distance B between the upper surface of the hydro-pneumatic spring drive axle assembly and the frame of the trailer, and the measured distances A and B are transmitted to the liftable hydro-pneumatic spring drive axle controller to serve as the reference of the height change in the follow-up driving process;
Step two: comparing the measured distance B with the calibrated distance C, and judging that the vehicle is in a medium and heavy load state when B is less than or equal to C, wherein the hydro-pneumatic spring drive axle assembly always maintains a descending state in the whole running process; when B is more than C, judging that the vehicle is in a light load or no-load state, at the moment, the hydro-pneumatic spring drive axle assembly is always in a lifting state when the vehicle is in a non-triggering condition, otherwise, the vehicle is put down, at the moment, a hydro-pneumatic spring drive axle height sensor measures a vertical distance D between the upper surface of the hydro-pneumatic spring drive axle assembly and a trailer frame, and the distance E=B-D is the lifting height;
Step three: when the driving is finished and the power supply of the whole vehicle is closed by a driver, the hydraulic pump stops working, the right electromagnetic valve and the left electromagnetic valve are controlled to be closed, the hydraulic loop is switched, the oil pressure in the right double-acting oil cylinder and the oil pressure in the left double-acting oil cylinder are gradually reduced, the hydro-pneumatic spring drive axle assembly is gradually reduced, and finally the grounding state is maintained.
Wherein, the triggering condition is: 1. when the brake pedal position sensor acquires that the brake pedal is within a predetermined opening range for a long time; 2. in the running process, the front axle height sensor of the tractor measures the real-time vertical distance F between the front axle body of the tractor and the lower wing surface of the frame of the tractor, when E is less than or equal to A-F, the front axle is used as a trigger condition, and when any one of the trigger conditions occurs, the lifting axle is quickly lowered, so that the braking performance of the vehicle and the reliability of the vehicle are improved.
The invention provides a distributed electrically driven trailer control system with a lifting drive axle and a method thereof, which have the following beneficial effects:
1. According to the distributed electrically-driven trailer control system and method with the lifting drive axle, when the lifting axle is lifted and the brake pedal is in a certain opening range for a long time, in order to prevent a heat fading phenomenon of a brake, the lifting axle can be put down, wheels at two ends of the lifting axle participate in braking, and the running resistance of the whole vehicle is increased, so that the braking performance and safety of the whole vehicle are improved.
2. According to the distributed electrically-driven trailer control system and method with the lifting drive axle, when the lifting axle is lifted and passes through an obstacle, the vertical distance between the lifting axle and the obstacle can be calculated through the height change of the front axle of the tractor, and when the distance is too small, the lifting axle is put down, so that the damage of the lifting axle caused by the impact of the obstacle is prevented, and the reliability of the lifting axle is improved.
Drawings
FIG. 1 is a left side view of the entire vehicle of the present invention;
FIG. 2 is a rear view of the assembled state of the hydro-pneumatic spring drive axle of the present invention;
FIG. 3 is a right side cross-sectional view of the assembled state of the hydro-pneumatic spring drive axle of the present invention;
fig. 4 is a left side cross-sectional view of the assembled state of the hydro-pneumatic spring drive axle of the present invention.
In the figure: 1. a brake pedal position sensor; 2. front axle height sensor of tractor; 3. a front axle body of the tractor; 4. a tractor frame; 5. a hydraulic pump; 6. a hydro-pneumatic spring drive axle controller; 7. a hydro-pneumatic spring drive axle height sensor; 8. hydro-pneumatic spring drive axle assembly; 801. a left motor assembly; 802. a left shock absorber; 803. a bridge housing; 804. a right shock absorber; 805. a right motor assembly; 806. a right double-acting oil cylinder; 807. v-shaped thrust rod; 808. a left double-acting oil cylinder; 809. a right connecting rod A; 8010. a right connecting rod B; 8011. a right connecting rod C; 8012. a left connecting rod A; 8013. a left connecting rod B; 8014. a left connecting rod C; 9. a trailer frame; 10. a right accumulator; 11. a right electromagnetic valve; 12. a left electromagnetic valve; 13. a left accumulator; 14. and a cab.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1 to 4, the present invention provides a technical solution: a distributed electrically driven trailer control system with a lifting drive axle comprises a brake pedal position sensor 1, a tractor front axle height sensor 2, a tractor front axle body 3, a tractor frame 4, a hydraulic pump 5, a hydro-pneumatic spring drive axle controller 6, a hydro-pneumatic spring drive axle height sensor 7, a hydro-pneumatic spring drive axle assembly 8, a trailer frame 9, a right accumulator 10, a right electromagnetic valve 11, a left electromagnetic valve 12, a left accumulator 13 and a cab 14, wherein the cab 14 is arranged at the top of the tractor frame 4, the brake pedal position sensor 1 is assembled in the cab 14, the tractor front axle height sensor 2 is assembled on the tractor front axle body 3, the hydraulic pump 5 is assembled outside the trailer frame 9, the hydro-pneumatic spring drive axle controller 6 is assembled on the inner side of the tractor frame 4, the trailer frame 9 is assembled with the hydro-pneumatic spring drive axle assembly 8 through lifting lugs, the spring drive axle height sensor 7 is assembled on the hydro-pneumatic spring drive axle assembly 8, the right and left and right electromagnetic valves 10 and 13 are assembled on the trailer frame 9, and the right and left electromagnetic valves 11 and left electromagnetic valve 12 are assembled on the trailer frame 9.
Wherein the hydro-pneumatic spring drive axle assembly 8 comprises a left motor assembly 801, a left shock absorber 802, an axle housing 803, a right shock absorber 804, a right motor assembly 805, a right double-acting cylinder 806, a v-shaped thrust rod 807, a left double-acting cylinder 808, a right connecting rod A809, a right connecting rod B8010, a right connecting rod C8011, a left connecting rod A8012, a left connecting rod B8013 and a left connecting rod C8014, wherein the left motor assembly 801 is mounted on the left side of the axle housing 803, the right motor assembly 805 is mounted on the right side of the axle housing 803, the right double-acting cylinder 806 is mounted on the right side of the trailer frame 9, the left double-acting cylinder 808 is mounted on the left side of the trailer frame 9, the v-shaped thrust rod 807 is positioned between the right double-acting cylinder 806 and the left double-acting cylinder 808, the right connecting rod C8011 is mounted on the right side of the trailer frame 9, the right connecting rod A809 is assembled below the trailer frame 9 and is positioned at the front end of the right connecting rod C8011, one end of the right double-acting oil cylinder 806 is connected with one end of the right connecting rod C8011, the right connecting rod B8010 is installed at one end of the right double-acting oil cylinder 806, the right shock absorber 804 is installed on the right side of the trailer frame 9, the left connecting rod C8014 is installed on the left side of the trailer frame 9, the left connecting rod A8012 is assembled at the front end of the left connecting rod C8014 below the trailer frame 9, one end of the left double-acting oil cylinder 808 is connected with one end of the left connecting rod C8014, the left connecting rod B8013 is installed at one end of the left double-acting oil cylinder 808, the left shock absorber 802 is installed on the left side of the trailer frame 9, and axle housings 803 are connected with one ends of the right connecting rod B8010.
The brake pedal position sensor 1 is used for acquiring brake pedal position information in real time; the front axle height sensor 2 of the tractor is used for acquiring the vertical distance between the upper surface of the front axle body 3 of the tractor and the lower airfoil surface of the frame 4 of the tractor in real time.
Wherein, the hydraulic pump 5 is used for providing power for the right double-acting oil cylinder 806 and the left double-acting oil cylinder 808; and the hydro-pneumatic spring drive axle height sensor 7 is used for measuring the distance between the upper surface of the hydro-pneumatic spring drive axle assembly 8 and the lower airfoil surface of the trailer frame 9.
The right accumulator 10 and the left accumulator 13 are used for respectively converting fluid energy in the right double-acting cylinder 806 and the left double-acting cylinder 808 into elastic potential energy and absorbing and buffering impact energy.
The right electromagnetic valve 11 and the left electromagnetic valve 12 are assembled on the trailer frame 9, and the flow directions of hydraulic oil in the right double-acting oil cylinder 806 and the left double-acting oil cylinder 808 are respectively controlled by switching different loops, so that the lifting of the liftable hydro-pneumatic spring drive axle assembly 8 is controlled.
A method of controlling a distributed electrically driven trailer having a lift drive axle, comprising the steps of:
Step one: when a driver starts the vehicle and does not drive, the front axle height sensor 2 of the tractor measures the vertical distance A between the front axle body 3 of the tractor and the lower wing surface of the tractor frame 4, the hydro-pneumatic spring drive axle height sensor 7 measures the vertical distance B between the upper surface of the hydro-pneumatic spring drive axle assembly 8 and the trailer frame 9, and the measured distances A and B are transmitted to the liftable hydro-pneumatic spring drive axle controller 6 to serve as the reference of the height change in the follow-up driving process;
Step two: comparing the measured distance B with the calibrated distance C, and judging that the vehicle is in a medium and heavy load state when B is less than or equal to C, wherein the hydro-pneumatic spring drive axle assembly 8 always maintains a descending state in the whole running process; when B is more than C, judging that the vehicle is in a light load or no-load state, at the moment, the hydro-pneumatic spring drive axle assembly 8 is always in a lifting state when the vehicle is not triggered, otherwise, the vehicle is put down, at the moment, the hydro-pneumatic spring drive axle height sensor 7 measures the vertical distance D between the upper surface of the hydro-pneumatic spring drive axle assembly 8 and the trailer frame 9, and the distance E=B-D is the lifting height;
Step three: when the driving is finished and the power supply of the whole vehicle is turned off by the driver, the hydraulic pump 5 stops working, the right electromagnetic valve 11 is controlled, the left electromagnetic valve 12 is closed, the hydraulic circuit is switched, the oil pressure in the right double-acting oil cylinder 806 and the left double-acting oil cylinder 808 is gradually reduced, the hydro-pneumatic spring drive axle assembly 8 is gradually reduced, and finally the grounding state is maintained.
Wherein, the triggering condition is: 1. when the brake pedal position sensor 1 acquires that the brake pedal is within a predetermined opening range for a long time; 2. in the running process, the front axle height sensor 2 of the tractor measures the real-time vertical distance F between the front axle body 3 of the tractor and the lower wing surface of the frame 4 of the tractor, when E is less than or equal to A-F, the front axle is used as a trigger condition, and when any one of the trigger conditions occurs, the lifting axle is quickly lowered, so that the braking performance of the vehicle and the reliability of the vehicle are improved.
In summary, the distributed electrically driven trailer control system and method with a lift drive axle, when in use: when the hydro-pneumatic spring drive axle assembly 8 is in a lifting state, a driver presses a brake pedal for a long time, and the opening of the brake pedal is kept in a preset opening range, the hydro-pneumatic spring drive axle controller 6 judges that the vehicle is in a long downhill working condition by reading real-time information of the brake pedal position sensor 1. To avoid brake heat fade caused by working conditions, and to affect braking performance, the right solenoid valve 11 and the left solenoid valve 12 are controlled to be closed, the hydraulic circuits of the right double-acting cylinder 806 and the left double-acting cylinder 808 are switched to enable the right double-acting cylinder 806 and the left double-acting cylinder 808 to move downwards, the hydro-pneumatic spring drive axle assembly 8 is put down, when the hydro-pneumatic spring drive axle height sensor 7 measures that the vertical distance between the upper surface of the hydro-pneumatic spring drive axle assembly 8 and the trailer frame 9 is equal to B, the right double-acting cylinder 806 and the left double-acting cylinder 808 stop moving downwards, and the oil pressure in the hydraulic circuits is kept, at the moment, wheels are grounded and participate in braking, and the left motor assembly 801 and the right motor assembly 805 optionally participate in braking. When the driver does not continuously step on the brake pedal within a certain time or the opening of the brake pedal is smaller than a certain value, the hydro-pneumatic spring drive axle controller 6 judges that the vehicle drives away from a long downhill road section by reading the information of the brake pedal position sensor 1, at the moment, the right electromagnetic valve 11 and the left electromagnetic valve 12 are controlled to be closed, the hydraulic circuits of the right double-acting oil cylinder 806 and the left double-acting oil cylinder 808 are switched, so that the right double-acting oil cylinder 806 and the left double-acting oil cylinder 808 move upwards, and the liftable hydro-pneumatic spring drive axle assembly 8 is lifted. When the vertical distance between the upper surface of the hydro-pneumatic spring drive axle assembly 8 and the trailer frame 9 measured by the hydro-pneumatic spring drive axle height sensor 7 is equal to D, the right double-acting oil cylinder 806 and the left double-acting oil cylinder 808 stop moving upwards, and the oil pressure in the hydraulic circuit is maintained, and at the moment, the hydro-pneumatic spring drive axle assembly 8 is lifted to a preset height;
When the hydro-pneumatic spring drive axle assembly 8 is in a lifting state, the tractor front axle body 3 drives over an obstacle, and if the height of the obstacle is higher than the lifting height of the hydro-pneumatic spring drive axle assembly 8, namely E is less than or equal to A-F, the hydro-pneumatic spring drive axle controller 6 judges that the obstacle can damage the hydro-pneumatic spring drive axle assembly 8 through reading information of the tractor front axle height sensor 2 and the hydro-pneumatic spring drive axle height sensor 7 through calculation. And the right electromagnetic valve 11 and the left electromagnetic valve 12 are controlled to be closed, and the hydraulic circuits of the right double-acting oil cylinder 806 and the left double-acting oil cylinder 808 are switched, so that the right double-acting oil cylinder 806 and the left double-acting oil cylinder 808 rapidly move downwards, and the hydro-pneumatic spring drive axle assembly 8 is put down. When the vertical distance between the upper surface of the hydro-spring drive axle assembly 8 and the trailer frame 9 is measured by the hydro-spring drive axle height sensor 7 to be equal to B, the right double-acting cylinder 806 and the left double-acting cylinder 808 stop moving downwards and maintain the oil pressure in the hydraulic circuit, at this time, the wheels are grounded and roll freely, and the left motor assembly 801 and the right motor assembly 805 do not work. In general, the driver will slow down the vehicle when encountering an obstacle, and the hydro-spring drive axle assembly 8 is located at the rear end of the trailer frame 9, so there is sufficient time to lower the hydro-spring drive axle assembly 8. When the height change of the front axle body 3 of the tractor and the hydro-pneumatic spring drive axle assembly 8 in a certain time does not exceed a preset value, the hydro-pneumatic spring drive axle controller 6 judges that the vehicle drives away from an obstacle or an obstacle section by reading the information of the front axle height sensor 2 of the tractor and the hydro-pneumatic spring drive axle height sensor 7. And the right electromagnetic valve 11 and the left electromagnetic valve 12 are controlled to be closed, and the hydraulic circuits of the right double-acting oil cylinder 806 and the left double-acting oil cylinder 808 are switched, so that the right double-acting oil cylinder 806 and the left double-acting oil cylinder 808 move upwards, and the hydro-pneumatic spring drive axle assembly 8 is lifted. When the vertical distance between the upper surface of the hydro-pneumatic spring drive axle assembly 8 and the trailer frame 9 measured by the hydro-pneumatic spring drive axle height sensor 7 is equal to D, the right double-acting oil cylinder 806 and the left double-acting oil cylinder 808 stop moving upwards, and the oil pressure in the hydraulic circuit is maintained, and at the moment, the hydro-pneumatic spring drive axle assembly 8 is lifted to a preset height;
The working process of the hydro-pneumatic spring drive axle assembly 8 comprises the following steps: the hydraulic pump 5 presses hydraulic oil into the hydraulic pipeline, passes through the right solenoid valve 11, and the left solenoid valve 12 enters the right double-acting cylinder 806 and the left double-acting cylinder 808 respectively. By controlling the closing of the right electromagnetic valve 11 and the left electromagnetic valve 12, different loops can be switched, so that the movement direction of the double-acting oil cylinder is controlled, and the lifting and the lowering of the hydro-pneumatic spring drive axle assembly 8 can be realized. When the hydro-pneumatic spring drive axle assembly 8 moves to a preset height, the pressure of the hydraulic circuit is maintained through the control electromagnetic valve. When the hydro-pneumatic spring drive axle assembly 8 is in a lowered state and is impacted by a road surface, for example, a right side mechanism, road surface excitation is transmitted to the trailer frame 9 through tires via the right link a809, the right link B8010, the right link C8011, the right shock absorber 804 and the right double-acting cylinder 806. The components are all axially rotatable about fixed points at both ends thereof, and the right damper 804 absorbs some of the excitation. The right double-acting oil cylinder 806 is driven to move up and down by excitation, hydraulic oil is forced to enter the right energy accumulator 10, and impact force is converted into elastic potential energy by compressing inert gas, so that the shock absorption effect is realized. When the hydro-pneumatic spring drive axle assembly 8 is in the lifted state, the hydro-pneumatic spring drive axle assembly 8 is ensured to be in the lifted state by maintaining the oil pressure in the hydraulic circuit. When the hydro-pneumatic spring drive axle assembly 8 is in a driving or braking state, the driving/braking force is transmitted to the trailer frame 9 through the right connecting rod A809 and the v-shaped thrust rod 807 by taking a right side mechanism as an example, so that the driving and braking of the whole vehicle are realized.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (1)
1. A distributed electrically driven trailer control system having a lift drive axle, characterized by: the hydraulic pump is characterized by comprising a brake pedal position sensor (1), a tractor front axle height sensor (2), a tractor front axle body (3), a tractor frame (4), a hydraulic pump (5), a hydro-pneumatic spring drive axle controller (6), a hydro-pneumatic spring drive axle height sensor (7), a hydro-pneumatic spring drive axle assembly (8), a trailer frame (9), a right energy accumulator (10), a right electromagnetic valve (11), a left electromagnetic valve (12), a left energy accumulator (13) and a cab (14), wherein the cab (14) is arranged at the top of the tractor frame (4), the brake pedal position sensor (1) is assembled in the cab (14), the tractor front axle height sensor (2) is assembled on the tractor front axle body (3), the hydraulic pump (5) is assembled outside the trailer frame (9), the hydro-pneumatic spring drive axle controller (6) is assembled inside the tractor frame (4), the hydro-pneumatic spring drive axle assembly (8) is assembled on the trailer frame (9) through lifting lugs, the hydro-pneumatic spring drive axle height sensor (7) is assembled on the trailer frame (9) and the left energy accumulator (10), the right electromagnetic valve (11) and the left electromagnetic valve (12) are assembled on the trailer frame (9);
The hydro-pneumatic spring drive axle assembly (8) comprises a left motor assembly (801), a left shock absorber (802), an axle housing (803), a right shock absorber (804), a right motor assembly (805), a right double-acting oil cylinder (806), a v-shaped thrust rod (807), a left double-acting oil cylinder (808), a right connecting rod A (809), a right connecting rod B (8010), a right connecting rod C (8011), a left connecting rod A (8012), a left connecting rod B (8013) and a left connecting rod C (8014), wherein the left side of the axle housing (803) is provided with the left motor assembly (801), the right side of the axle housing (803) is provided with the right motor assembly (805), the right side of the trailer frame (806) is provided with the right double-acting oil cylinder (806), the left side of the trailer frame (9) is provided with the left double-acting oil cylinder (808), the v-shaped thrust rod (807) is positioned between the right double-acting oil cylinder (806) and the left double-acting oil cylinder (808), the right side of the trailer frame (9) is provided with the right connecting rod C (8011), the lower part of the trailer frame (9) is provided with the double-acting connecting rod C (8011) and the front end of the trailer frame (8011) is provided with one end of the right connecting rod (8011), the right shock absorber (804) is arranged on the right side of the trailer frame (9), the left connecting rod C (8014) is arranged on the left side of the trailer frame (9), the left connecting rod A (8012) is arranged below the trailer frame (9) and positioned at the front end of the left connecting rod C (8014), one end of the left double-acting oil cylinder (808) is connected with one end of the left connecting rod C (8014), the left connecting rod B (8013) is arranged at one end of the left double-acting oil cylinder (808), the left shock absorber (802) is arranged on the left side of the trailer frame (9), and axle housings (803) are respectively connected with the left shock absorber (802), the left connecting rod A (8012), the left connecting rod B (8013), the right shock absorber (804), the right connecting rod A (809) and one end of the right connecting rod B (8010);
The right electromagnetic valve (11) and the left electromagnetic valve (12) are assembled on the trailer frame (9), and the flow directions of hydraulic oil in the right double-acting oil cylinder (806) and the left double-acting oil cylinder (808) are respectively controlled by switching different loops, so that the lifting of the liftable hydro-pneumatic spring drive axle assembly (8) is controlled;
the control method of the distributed electrically driven trailer with the lifting drive axle comprises the following steps:
step one: when a driver starts a vehicle and does not drive, a tractor front axle height sensor (2) measures a vertical distance A between a tractor front axle body (3) and a lower wing surface of a tractor frame (4), a hydro-pneumatic spring drive axle height sensor (7) measures a vertical distance B between the upper surface of a hydro-pneumatic spring drive axle assembly (8) and a trailer frame (9), and the measured distances A and B are transmitted to a liftable hydro-pneumatic spring drive axle controller (6) to serve as a reference of height change in a follow-up driving process;
step two: comparing the measured distance B with the calibrated distance C, and judging that the vehicle is in a medium and heavy load state when B is less than or equal to C, wherein the hydro-pneumatic spring drive axle assembly (8) is always kept in a descending state in the whole running process; when B is more than C, judging that the vehicle is in a light load or no-load state, at the moment, the hydro-pneumatic spring drive axle assembly (8) is always in a lifting state when the vehicle is not triggered, otherwise, the vehicle is put down, at the moment, the hydro-pneumatic spring drive axle height sensor (7) measures the vertical distance D between the upper surface of the hydro-pneumatic spring drive axle assembly (8) and the trailer frame (9), and the distance E=B-D is the lifting height;
step three: when the running is finished and the power supply of the whole vehicle is closed by a driver, the hydraulic pump (5) stops working, the right electromagnetic valve (11) is controlled, the left electromagnetic valve (12) is closed, a hydraulic circuit is switched, the oil pressure in the right double-acting oil cylinder (806) and the oil pressure in the left double-acting oil cylinder (808) are gradually reduced, the hydro-pneumatic spring drive axle assembly (8) is gradually reduced, and finally the grounding state is maintained;
The triggering conditions are as follows: 1. when the brake pedal position sensor (1) acquires that the brake pedal is within a predetermined opening range for a long time; 2. in the running process, a front axle height sensor (2) of the tractor measures a real-time vertical distance F between a front axle body (3) of the tractor and a lower airfoil surface of a frame (4) of the tractor, and when E is less than or equal to A-F, the trigger condition is met; when any one of the triggering conditions occurs, the lifting bridge is quickly lowered, and the braking performance and the reliability of the vehicle are improved;
the brake pedal position sensor (1) is used for acquiring brake pedal position information in real time; the tractor front axle height sensor (2) is used for acquiring the vertical distance between the upper surface of the tractor front axle body (3) and the lower airfoil surface of the tractor frame (4) in real time;
The hydraulic pump (5) is used for providing power for the right double-acting oil cylinder (806) and the left double-acting oil cylinder (808); the hydro-pneumatic spring drive axle height sensor (7) is used for measuring the distance between the upper surface of the hydro-pneumatic spring drive axle assembly (8) and the lower airfoil surface of the trailer frame (9);
The right accumulator (10) and the left accumulator (13) are used for respectively converting fluid energy in the right double-acting oil cylinder (806) and the left double-acting oil cylinder (808) into elastic potential energy and absorbing and buffering impact energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311790859.2A CN117799379B (en) | 2023-12-25 | 2023-12-25 | Distributed electrically driven trailer control system and method with lifting drive axle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311790859.2A CN117799379B (en) | 2023-12-25 | 2023-12-25 | Distributed electrically driven trailer control system and method with lifting drive axle |
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| CN117799379A CN117799379A (en) | 2024-04-02 |
| CN117799379B true CN117799379B (en) | 2024-06-28 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101284488A (en) * | 2007-04-12 | 2008-10-15 | 哈尔德克斯制动器公司 | Electronic height control system for a vehicle with multiple input signals |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5457641B2 (en) * | 2008-04-15 | 2014-04-02 | 株式会社クボタ | Work vehicle suspension structure |
| KR20170028126A (en) * | 2015-09-03 | 2017-03-13 | 엘지전자 주식회사 | Driver assistance apparatus for vehicle and Vehicle |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101284488A (en) * | 2007-04-12 | 2008-10-15 | 哈尔德克斯制动器公司 | Electronic height control system for a vehicle with multiple input signals |
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