CN111017012A - Electric control hydraulic vehicle steering system and debugging method - Google Patents
Electric control hydraulic vehicle steering system and debugging method Download PDFInfo
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- CN111017012A CN111017012A CN201911414749.XA CN201911414749A CN111017012A CN 111017012 A CN111017012 A CN 111017012A CN 201911414749 A CN201911414749 A CN 201911414749A CN 111017012 A CN111017012 A CN 111017012A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/062—Details, component parts
- B62D5/063—Pump driven by vehicle engine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/16—Arrangement of linkage connections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/20—Links, e.g. track rods
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
Abstract
The invention relates to an electric control hydraulic vehicle steering system and method, a mechanical hydraulic power-assisted steering system, an electric control hydraulic active steering system and a controller. The mechanical hydraulic power-assisted steering system can assist a mechanical connecting rod to realize the active steering of a front end steering axle of the vehicle; the electric control hydraulic active steering system can drive the rear end steering axle of the vehicle to steer. The controller is in signal connection with an angular displacement sensor of the front-end steering axle, the controller can calculate the angular displacement required by the rear-end steering axle according to the angular displacement of the front-end steering axle, and the controller controls the electric control hydraulic active steering system to move so as to drive the rear-end steering axle to rotate by a set angle.
Description
Technical Field
The invention belongs to the technical field of vehicles, and particularly relates to an electric control hydraulic vehicle steering system and a debugging method.
Background
At present, a mechanical connecting rod type hydraulic power-assisted steering system is mainly adopted by a multi-shaft vehicle steering system, and the multi-shaft vehicle steering system has the advantages of low cost, safety and reliability, but the mechanical multi-shaft steering system has poor stability when the vehicle runs at a high speed and poor flexibility under different working conditions, and is difficult to give consideration to good trafficability at a low speed and running stability at a high speed.
The field of the vehicle industry has new and higher requirements on the trafficability characteristic of a vehicle in a narrow space and the high-speed running stability, the traditional mechanical connecting rod type multi-shaft steering system cannot give consideration to both the trafficability characteristic and the high-speed running stability, and the electric control hydraulic active steering is the development direction in the conventional steering system. The steering rod assembly of the multi-shaft independent suspension type and multi-mode electric control steering system is complex, and the problem of abnormal wear of the wheels of the multi-shaft vehicle caused by eccentric wear of the wheels of the vehicle, running deviation of the vehicle, inclined running of the vehicle and the like due to improper debugging of the steering rod assembly.
The inventor thinks that the electric control hydraulic active steering mode can realize good passing performance and high-speed driving stability of the multi-shaft independent suspension cross-country vehicle during low-speed driving; in the debugging process of the electric control hydraulic active steering hydraulic system, the traditional mechanical rod system debugging method cannot be applied to the electric control hydraulic multi-shaft steering system, and the deviation, the oblique running and the abnormal abrasion of tires of a vehicle are easy to occur, so that the manpower, the material resources and the financial resources are increased.
Disclosure of Invention
The invention aims to provide an electric control hydraulic vehicle steering system, which can overcome the defects generated when the existing mechanical connecting rod type multi-shaft steering system and the electric control hydraulic steering system are used independently and improve the overall steering performance of a vehicle.
The second purpose of the invention is to provide a debugging method of the electric control hydraulic vehicle steering system, which ensures the normal performance of the vehicle steering system, avoids the running deviation and the inclined running of the vehicle, avoids the early abnormal abrasion of the tire, prolongs the service life of the tire and exerts the performance of the steering system.
In order to achieve the purpose, the invention provides an electric control hydraulic vehicle steering system, a mechanical hydraulic power-assisted steering system, an electric control hydraulic active steering system and a controller.
The mechanical hydraulic power-assisted steering system can assist a mechanical connecting rod to realize the active steering of a front end steering axle of the vehicle; the electric control hydraulic active steering system can drive the rear end steering axle of the vehicle to steer.
The controller is in signal connection with an angular displacement sensor of the front-end steering axle, the controller can calculate the angular displacement required by the rear-end steering axle according to the angular displacement of the front-end steering axle, and the controller controls the electric control hydraulic active steering system to move so as to drive the rear-end steering axle to rotate by a set angle.
The electric control hydraulic active steering system comprises a steering rod assembly, the steering rod assembly is connected with a rear axle centering locking oil cylinder and a rear axle steering power-assisted oil cylinder in the electric control hydraulic active steering system, and the structure of the steering rod assembly is set as follows: when the rear axle centering locking oil cylinder enters a centering locking state, wheels of the vehicle are in a straight-going state.
Furthermore, mechanical hydraulic power-assisted steering system includes front axle steering pump and turns to emergent pump, front axle steering pump and the emergent pump that turns to are connected with the hydraulic oil tank respectively, the pressure oil that front axle steering pump, the emergent pump that turns to supply out passes through the emergency control valves and gets into the flow control valves, and the flow control valves can realize the emergent confluence, the voltage limiting of hydraulic oil, the stationary flow and send hydraulic oil into the steering gear, the action of steering gear control front axle power-assisted steering hydro-cylinder realizes the hydraulic power-assisted steering of front axle.
Furthermore, the rear axle steering pump is connected with the hydraulic oil tank, the rear axle steering pump is driven by an engine, the rear axle steering pump can output pressure oil to the oil source control valve group, and the oil source control valve group is respectively connected with the energy accumulator, the control valve group and the rear axle steering control valve group.
Furthermore, the energy accumulator and the control valve group output pressure oil enter a centering control valve group, the centering control valve group is connected with the rear axle centering locking oil cylinder, and the controller controls the centering control valve group to realize the action of the rear axle centering locking oil cylinder.
Furthermore, the rear axle steering control valve group is connected with the rear axle steering power-assisted cylinder, and the controller can control the rear axle steering control valve group so as to realize the action of the rear axle steering resistance cylinder.
The rear axle steering control valve group, the oil source control valve group, the energy accumulator, the control valve group and the centering control valve group are respectively connected with the hydraulic oil tank through oil return pipelines.
The steering rod assembly comprises a first steering cylinder arm and a second steering cylinder arm, the first steering cylinder arm is fixed with a piston rod of a rear axle centering locking cylinder, a cylinder body of the rear axle centering locking cylinder is connected and fixed with the frame body, the first steering cylinder arm is fixedly connected with a first steering swing arm, the first steering swing arm is connected with a steering tie rod and a first steering side pull rod, the first steering side pull rod is connected with a first steering trapezoid arm, and the first steering trapezoid arm is connected with a first steering knuckle and wheels;
the second steering cylinder arm is fixed with a piston rod of the rear axle steering power-assisted cylinder, a cylinder body of the rear axle steering power-assisted cylinder is fixedly connected with the frame body, the second steering cylinder arm is fixedly connected with the second steering swing arm, the second steering swing arm is connected with a steering tie rod and a second steering side pull rod, the first steering side pull rod is connected with a second steering trapezoid arm, and the second steering trapezoid arm is connected with a second steering knuckle and wheels.
The invention also provides a debugging method of the electric control hydraulic vehicle steering system, which comprises the following steps:
starting the vehicle, and sending an instruction through a controller to enable the rear axle centering and locking oil cylinder to be in a rear axle centering and locking state;
on the premise of ensuring that the vehicle wheels have reasonable toe-in values, the lengths of the first steering side pull rod and the transverse pull rod are adjusted to enable the first steering swing arm and the first steering cylinder arm to be located at initial neutral positions;
and measuring the installation position distance between the first steering cylinder arm and the rear end of the rear axle centering locking cylinder, adjusting the length of the rear axle centering locking cylinder according to the installation position distance, and installing the rear axle centering locking cylinder in place.
The invention has the beneficial effects that:
1) the combination of the mechanical connecting rod type hydraulic steering system and the electric control hydraulic steering system can realize the conversion of different steering modes under various different driving working conditions so as to ensure good trafficability of the vehicle during low-speed driving and stability during high-speed driving.
2) A first steering oil cylinder of a first steering axle and a second steering oil cylinder of a second steering axle in a front axle steering set respectively pass through a single-loop mechanical transmission type steering system with emergency loop hydraulic power assistance, and a fourth steering axle and a fifth steering axle in a rear axle steering set adopt electric control hydraulic steering systems. The steering system is provided with an emergency oil way, and when the main oil way breaks down, the emergency oil source supplies oil to the system to ensure that the vehicle can realize the steering function.
3) By adopting the centering locking oil cylinder, the rear axle steering group (the fourth axle and the fifth axle) can be realized under the high-speed running state of the vehicle, the steering of the fourth axle and the fifth axle during the high-speed running is avoided, and the good operation stability of the vehicle is ensured.
4) The method has the advantages that the method firstly enters a centering locking state in the rear axle electric control active steering system, the mounting distance of the centering locking oil cylinder is measured after the positions of wheels are measured and the positions of steering swing arms are adjusted, and then the length of the centering locking oil cylinder is adjusted, so that the abnormal problems of running deviation, inclined running of the vehicle, abnormal wheel abrasion and the like of the vehicle can be effectively avoided when the vehicle runs in a straight line.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a block diagram of a hydraulic system in an embodiment of the present invention;
FIG. 2 is a schematic view of a steering rod assembly arrangement in an embodiment of the present invention.
In the figure, 1, a hydraulic oil tank; 2. a front axle steering pump; 3. a rear axle steering pump; 4. a steering emergency pump; 5. an emergency control valve bank; 6. a flow control valve group; 7. a diverter; 8. a front axle steering power-assisted oil cylinder; 9. an oil source control valve group; 10. an accumulator and a control valve bank; 11. centering the control valve group; 12. the rear axle is centered and locked with the oil cylinder; 13. a rear axle steering control valve group; 14. a rear axle steering power-assisted cylinder; 15. a first wheel; 16. a first steering knuckle; 17. a first steering trapezoid arm; 18. a first steering side tie rod; 19. a first steering swing arm; 20. a tie rod; 21. a second steering side tie rod; 22. a second knuckle; 23. a second wheel; 24. a second steering trapezoid arm; 25. a second steering swing arm; 26. a second steering cylinder arm; 27. a rear axle steering power-assisted cylinder; 28. the rear axle is centered and locked with the oil cylinder; 29. a first steering cylinder arm.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In an exemplary embodiment of the present invention, as shown in fig. 1-2, an electrically controlled hydraulic vehicle steering system includes a mechanical hydraulic power steering system, an electrically controlled hydraulic active steering system and an associated steering rod assembly, wherein the mechanical hydraulic power steering system is capable of assisting a mechanical link to achieve active steering of a front steering axle of a vehicle.
The electric control hydraulic active steering system can drive a rear steering axle set of the vehicle to steer; in the electric control hydraulic steering system, a controller detects a steering angle in a front steering axle set, calculates the steering angle in a rear axle steering set, and converts the steering angle into an electric signal to control the electric control steering hydraulic system to realize the active steering of the rear axle steering axle set.
The steering rod component of the electric control hydraulic active steering system is connected with a steering power-assisted cylinder, a centering locking cylinder, a steering knuckle and wheels in the electric control hydraulic active steering system so as to realize the deflection of the wheels according to a certain relation and realize the steering and centering locking functions of the wheels in a rear axle steering group.
The front axle steering pump 2 and the steering emergency pump 4 are connected with the hydraulic oil tank 1, the front axle steering pump 2 is driven by an engine, the steering emergency pump 4 is driven by a transfer case, pressure oil supplied by the front axle steering pump 2 and the steering emergency pump 4 enters the flow control valve group 6 through the emergency control valve group 5, hydraulic oil enters the steering gear 7 after emergency confluence, pressure limiting and flow stabilizing, and the steering gear controls the front axle steering power-assisted oil cylinder 8 to act, so that hydraulic power-assisted steering is realized.
Furthermore, in the mechanical hydraulic power-assisted steering system, oil return paths in the steering gear 7, the flow control valve group 6 and the emergency control valve group 5 are connected and communicated with the hydraulic oil tank 1.
Further, the electric control hydraulic active steering system comprises a rear axle steering pump 3, an oil source control valve group 9, an energy accumulator and control valve group 10, a centering control valve group 11, a rear axle centering locking oil cylinder 12, a rear axle steering control valve group 13 and a rear axle steering power-assisted oil cylinder 14.
Rear axle steering pump 3 is connected with hydraulic tank 1, rear axle steering pump 3 is by engine drive, rear axle steering pump exports pressure oil and gets into oil source control valve group 9, oil source control valve group 9 respectively with energy storage ware and control valve group 10 rear axle steering control valve group 13 links to each other.
Further, pressure oil output by the energy accumulator and control valve group 10 enters the centering control valve group 11, the centering control valve group 11 is connected with a rear axle centering locking oil cylinder 12, and the centering control valve group 11 is controlled by the controller in the electric control hydraulic active steering system, so that the vehicle wheel centering locking function is realized.
Further, the rear axle steering control valve group 13 is connected with a rear axle steering power cylinder 14, and the controller controls the rear axle steering control valve group 13 through the electric control hydraulic active steering system, so that the active steering function of the vehicle is realized.
Further, the rear axle steering control valve group 13, the oil source control valve group 9, the accumulator and control valve group 10 and the centering control valve group 11 are connected with an oil return path and communicated with the hydraulic oil tank.
The steering rod assembly in the rear axle electric control steering system comprises a rear axle centering locking oil cylinder 28, a rear axle steering power-assisted oil cylinder 27, a first steering oil cylinder arm 29, a second steering oil cylinder arm 26, a first steering swing arm 19, a second steering swing arm 25, a steering tie rod 20, a first steering side tie rod 18, a second steering side tie rod 21, a first steering trapezoid arm 17, a second steering trapezoid arm 24, a first steering joint 16, a second steering joint 22, a first wheel 15 and a second wheel 23.
The rear axle centering locking oil cylinder 28 is fixedly connected with a vehicle frame body, the centering locking oil cylinder 28 is connected with a first steering oil cylinder arm 29, the first steering oil cylinder arm 29 is fixedly connected with a first steering swing arm 19, the first steering swing arm 19 is connected with a steering tie rod 20 and a first steering side pull rod 18, the first steering side pull rod 18 is connected with a first steering trapezoid arm 17, and the first steering trapezoid arm 17 is connected with a first steering knuckle 16 and a first wheel 15.
Further, the rear end of the rear axle steering cylinder 27 is fixedly connected with the vehicle frame body, the front end of the rear axle steering cylinder 27 is connected with the second steering cylinder arm 26, the second steering cylinder arm 26 is fixedly connected with the second steering swing arm 25, the second steering swing arm 26 is connected with the tie rod 20 and the second steering side tie rod 21, the second steering side tie rod 21 is connected with the second steering trapezoid arm 24, and the second steering trapezoid arm 24 is connected with the second steering knuckle 22 and the second wheel 23.
Further, the steering centering locking oil cylinder 28 and the steering power-assisted oil cylinder 24 are controlled by the electronic control hydraulic active steering system controller to realize the functions of steering and centering locking of vehicle wheels.
Further, when the vehicle steering rod assembly is installed and debugged, the vehicle is started, and the steering mode of the electric control steering system of the rear axle steering group is adjusted, so that the rear axle centering locking oil cylinder 28 is in a rear axle centering locking state.
Further, on the premise that the vehicle wheels have a reasonable toe-in value, the lengths of the first steering side tie rod 18, the second steering side tie rod 21 and the tie rod 20 are adjusted, so that the first steering swing arm 19, the second steering swing arm 25, the first steering cylinder arm 29 and the second steering cylinder arm 26 are in initial neutral positions.
Further, the distance between the first steering cylinder arm 29 and the installation position of the rear end of the steering centering locking cylinder 28 is measured, and therefore the length of the rear axle steering centering locking cylinder 28 is adjusted and the rear axle steering centering locking cylinder is installed in place.
By the method, the steering rod assembly of the rear axle electric control hydraulic active steering system can ensure that the abnormal problems of running deviation, vehicle inclined running, abnormal wheel abrasion and the like of the vehicle can not occur when the wheels of the electric control rear axle steering assembly run linearly.
The working principle is as follows:
under the action of a front axle steering pump 2 and a steering emergency pump 4, hydraulic oil enters a steering gear 7 through an emergency control valve group 5 and a flow control valve group 6, when a driver rotates a steering wheel, a hydraulic valve core in the steering gear 7 acts, and the hydraulic oil enters a front axle steering power-assisted oil cylinder 8 through the hydraulic valve core in the steering gear 7, so that the hydraulic power-assisted steering function is realized.
The principle of the steering hydraulic system of the rear axle steering group (of the fourth steering axle and the fifth steering axle) is as follows:
the first steering axle and the second steering axle mechanically control hydraulic steering, the vehicle-mounted steering controller calculates the tire rotation angles of the fourth steering axle and the fifth steering axle according to the steering angle of the first steering axle, and the rear axle steering power-assisted cylinder 14 acts under the action of the oil source control valve group 9 and the rear axle steering control valve group 13 to realize the active steering of the rear axle steering group (the fourth steering axle and the fifth steering axle).
When the rear axle locking mode is selected, the centering control valve group 11 controls the rear axle centering locking oil cylinder 12 to act, and the rear axle steering group enters a rear axle locking state, so that the rear axle steering group (a fourth steering axle and a fifth steering axle) keeps running linearly.
The mode switching of the vehicle chassis steering system needs to be selectively operated through a steering mode switch in a cab.
The steering modes are divided into two steering modes:
front two-axle and rear two-axle steering modes: when the speed sensor detects that the running speed is lower than the set speed per hour, the rear axle steering group (a fourth steering axle and a fifth steering axle) actively steers according to the steering angle of the first steering axle. The controller sends out command signals to enable the electromagnetic valve to be electrified, the electro-hydraulic proportional valve group to be electrified, the rear axle rotates to want to lease the centering locking oil cylinder 12 to be unloaded, the controller calculates tire rotation angles of a fourth steering axle and a fifth steering axle according to tire rotation angles of the first steering axle, and enables the rear axle steering power-assisted cylinder 14 to act through the given electro-hydraulic proportional valve group signals, and active steering of the rear axle steering group (the fourth steering axle and the fifth steering axle) is achieved.
Rear axle lock-up steering mode: when the running speed exceeds the set speed per hour, the controller sends out an instruction model to power off the electro-hydraulic proportional valve group, the electromagnetic valve is powered off, the rear axle steering power-assisted cylinder 14 is unloaded and can freely move, the rear axle centering cylinder 12 is locked, and the rear axle steering group (a fourth steering axle and a fifth steering axle) restores to a straight running state and keeps locked.
The independent suspension special automobile steering rod assembly is complex, and particularly for the independent suspension special automobile of an electric control hydraulic active steering system, the electric control active steering hydraulic system needs to be matched with the steering rod assembly.
The embodiment also provides a debugging method of the electric control hydraulic vehicle steering system, which comprises the following steps
When the steering rod assembly of the electronic control steering hydraulic active steering system is debugged, a rear axle centering locking oil cylinder 28 in the electronic control steering hydraulic system is required to enter a centering locking state, meanwhile, the lengths of a steering side pull rod and a steering cross pull rod are adjusted according to the requirement of a toe-in value of a vehicle wheel, at the moment, a steering oil cylinder arm is in a middle position, the distance between the steering oil cylinder arm and a support connected with the rear end of the centering locking cylinder is measured, and the distance is used as a constraint condition to install and fix after the length of the rear axle centering locking oil cylinder 28 is adjusted.
The steering rod assembly of the electric control hydraulic active steering system adjusted by the method can effectively avoid the problems of running deviation, vehicle inclined running, abnormal wheel abrasion and the like.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (7)
1. An electrically controlled hydraulic vehicle steering system, comprising,
the mechanical hydraulic power-assisted steering system can assist a mechanical connecting rod to realize the active steering of a front end steering axle of the vehicle;
the electric control hydraulic active steering system can drive a rear steering axle of a vehicle to steer;
the controller is in signal connection with an angular displacement sensor of the front-end steering axle, the controller can calculate the angular displacement required by the rear-end steering axle according to the angular displacement of the front-end steering axle, and the controller controls the electric control hydraulic active steering system to move so as to drive the rear-end steering axle to rotate by a set angle;
the electric control hydraulic active steering system comprises a steering rod assembly, the steering rod assembly is connected with a rear axle centering locking oil cylinder and a rear axle steering power-assisted oil cylinder in the electric control hydraulic active steering system, and the structure of the steering rod assembly is set as follows: when the rear axle centering locking oil cylinder enters a centering locking state, wheels of the vehicle are in a straight-going state;
the steering rod assembly comprises a first steering cylinder arm and a second steering cylinder arm, the first steering cylinder arm is fixed with a piston rod of a rear axle centering locking cylinder, a cylinder body of the rear axle centering locking cylinder is fixedly connected with the frame body, the first steering cylinder arm is fixedly connected with a first steering swing arm, the first steering swing arm is connected with a steering tie rod and a first steering edge pull rod, the first steering edge pull rod is connected with a first steering trapezoid arm, and the first steering trapezoid arm is connected with a first steering knuckle and wheels.
2. An electrically controlled hydraulic vehicle steering system according to claim 1, wherein the mechanical hydraulic power steering system includes a front axle steering pump and a steering emergency pump, the front axle steering pump and the steering emergency pump are respectively connected to the hydraulic oil tank, the pressure oil supplied from the front axle steering pump and the steering emergency pump enters the flow control valve set through the emergency control valve set, the flow control valve set can realize emergency confluence, pressure limitation and flow stabilization of the hydraulic oil and send the hydraulic oil into the steering gear, and the steering gear controls the front axle steering power cylinder to operate, so as to realize the hydraulic power steering of the front axle.
3. An electrically controlled hydraulic vehicle steering system according to claim 2, wherein the rear axle steering pump is connected to a hydraulic oil tank, the rear axle steering pump is driven by the engine, the rear axle steering pump is capable of delivering pressurized oil to the source control valve bank, and the source control valve bank is connected to the accumulator and the control valve bank, and the rear axle steering control valve bank, respectively.
4. An electrically controlled hydraulic vehicle steering system according to claim 3, wherein the accumulator and control valve group output pressure oil to the centering control valve group, the centering control valve group is connected to the rear axle centering lock cylinder, and the controller controls the centering control valve group to realize the rear axle centering lock cylinder.
5. An electrically controlled hydraulic vehicle steering system according to claim 4, wherein the rear axle steering control valve assembly is connected to a rear axle steering cylinder, and the controller is adapted to control the rear axle steering control valve assembly to effect actuation of the rear axle steering resistance cylinder.
The rear axle steering control valve group, the oil source control valve group, the energy accumulator, the control valve group and the centering control valve group are respectively connected with the hydraulic oil tank through oil return pipelines.
6. An electrically controlled hydraulic vehicle steering system according to claim 1,
the second steering cylinder arm is fixed with a piston rod of the rear axle steering power-assisted cylinder, a cylinder body of the rear axle steering power-assisted cylinder is fixedly connected with the frame body, the second steering cylinder arm is fixedly connected with the second steering swing arm, the second steering swing arm is connected with a steering tie rod and a second steering side pull rod, the first steering side pull rod is connected with a second steering trapezoid arm, and the second steering trapezoid arm is connected with a second steering knuckle and wheels.
7. A commissioning method for an electrically controlled hydraulic vehicle steering system according to any one of claims 1 to 6, comprising the steps of:
starting the vehicle, and sending an instruction through a controller to enable the rear axle centering and locking oil cylinder to be in a rear axle centering and locking state;
on the premise of ensuring that the vehicle wheels have reasonable toe-in values, the lengths of the first steering side pull rod and the transverse pull rod are adjusted to enable the first steering swing arm and the first steering cylinder arm to be located at initial neutral positions; and measuring the installation position distance between the first steering cylinder arm and the rear end of the rear axle centering locking cylinder, adjusting the length of the rear axle centering locking cylinder according to the installation position distance, and installing the rear axle centering locking cylinder in place.
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| CN201911414749.XA CN111017012A (en) | 2019-12-31 | 2019-12-31 | Electric control hydraulic vehicle steering system and debugging method |
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| CN201911414749.XA CN111017012A (en) | 2019-12-31 | 2019-12-31 | Electric control hydraulic vehicle steering system and debugging method |
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| CN113638923A (en) * | 2021-07-08 | 2021-11-12 | 中车唐山机车车辆有限公司 | Vehicle end corner hydraulic device and control method thereof |
| CN113788068A (en) * | 2021-09-07 | 2021-12-14 | 北京航天发射技术研究所 | Multimode electro-hydraulic all-wheel steering system for special vehicle and control method |
| CN114248839A (en) * | 2022-01-26 | 2022-03-29 | 湖南三一中型起重机械有限公司 | Vehicle emergency steering hydraulic system and working vehicle |
| CN115465359A (en) * | 2022-09-15 | 2022-12-13 | 泰安航天特种车有限公司 | Modular electro-hydraulic steering system of ultra-heavy type electric-driven multi-axle vehicle and control method |
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| CN107856732A (en) * | 2017-11-02 | 2018-03-30 | 北京航天发射技术研究所 | Electro-hydraulic steering hydraulic system for multi-mode control |
| CN108216360A (en) * | 2018-01-17 | 2018-06-29 | 中国石油大学(华东) | Multiaxis hybrid vehicle mechanical-hydraulic mixes steering with the grouping of active differential |
| CN110282008A (en) * | 2019-04-22 | 2019-09-27 | 中国北方车辆研究所 | A kind of rear-axle steering integrates valve group and transfer |
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| CN113638923A (en) * | 2021-07-08 | 2021-11-12 | 中车唐山机车车辆有限公司 | Vehicle end corner hydraulic device and control method thereof |
| CN113638923B (en) * | 2021-07-08 | 2023-10-31 | 中车唐山机车车辆有限公司 | Vehicle end corner hydraulic device and control method thereof |
| CN113788068A (en) * | 2021-09-07 | 2021-12-14 | 北京航天发射技术研究所 | Multimode electro-hydraulic all-wheel steering system for special vehicle and control method |
| CN114248839A (en) * | 2022-01-26 | 2022-03-29 | 湖南三一中型起重机械有限公司 | Vehicle emergency steering hydraulic system and working vehicle |
| CN115465359A (en) * | 2022-09-15 | 2022-12-13 | 泰安航天特种车有限公司 | Modular electro-hydraulic steering system of ultra-heavy type electric-driven multi-axle vehicle and control method |
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