A vehicle steering hydraulic pipeline system and its control method

Abstract

The present application relates to a vehicle steering hydraulic pipeline system and a control method thereof, including: A common section includes a first communication valve, a steering oil tank, a steering oil pump, and a second communication valve that are sequentially connected through pipelines; A first oil supply section includes a first steering assist component for connecting to the vehicle's front wheels, and the first oil supply section and the common section form a first loop; A second oil supply section includes a normally closed connection valve and a second steering assist component that are sequentially connected through pipelines, and the second oil supply section and the common section form a second loop; A control device is connected to the normally closed connection valve and is used to control the opening or closing of the normally closed connection valve to connect or disconnect the second loop; Since there is one steering oil tank and one steering oil pump, it can ensure consistent pressure and consistent oil quality, avoid the pressure and oil quality differences of setting two oil supply systems, reduce power consumption, and cooperate with an appropriate control strategy to provide hydraulic power during the active steering of the rear axle.

Description

Technical Field

[0001] This application relates to the technical field of automotive steering systems, and particularly relates to a vehicle steering hydraulic pipeline system and its control method. Background Art

[0002] Currently, the steering systems of conventional vehicles use front axle steering. Some vehicles have added mid-axle or rear-axle steering devices to improve vehicle passability, reduce the turning diameter of the whole vehicle, or improve benefits, and most of them use follow-up steering. However, the wheels of follow-up steering are driven to rotate passively, and there is a problem of tire wear to a certain extent. Therefore, active steering of the mid-rear axles is considered to be a direction to improve the tire wear problem.

[0003] In some related technologies, active steering of the mid-axle or rear-axle involves steering devices and hydraulic power sources. The common solution is to add a set of steering oil pumps and pipeline systems to provide hydraulic assistance. However, the front and rear steering systems respectively use two sets of steering oil pumps and steering hydraulic pipeline systems, and there are differences in the coordination and synchronization when controlling the two sets of steering oil pumps, which poses certain risks in the actual control process and also leads to problems of high cost and many components. In addition, due to the limited space of the vehicle, there are also great difficulties in layout and assembly. Summary of the Invention

[0004] The embodiments of this application provide a vehicle steering hydraulic pipeline system and its control method to solve the problem of differences in coordination and synchronization when controlling two sets of steering oil pumps in related technologies.

[0005] In a first aspect, a vehicle steering hydraulic pipeline system is provided, which includes:

[0006] A common section, which includes a first connection valve, a steering oil tank, a steering oil pump, and a second connection valve connected in sequence through pipelines;

[0007] A first oil supply section, which includes a first steering assist member for connecting with the vehicle front wheels. The input end of the first steering assist member is connected to the second connection valve through a pipeline, and the output end of the first steering assist member is connected to the first connection valve through a pipeline to form a first loop with the common section;

[0008] A second oil supply section, which includes a normally closed connection valve and a second steering assist member connected in sequence through pipelines. The normally closed connection valve is communicated with the second connection valve; the second steering assist member is communicated with the first connection valve to form a second loop with the common section;

[0009] A control device, which is connected to the normally closed connection valve and is used to control the opening or closing of the normally closed connection valve to connect or disconnect the second loop.

[0010] Due to the provision of a common section, a first oil supply section, and a second oil supply section, the second oil supply section includes a normally closed connection valve and a second steering assist member connected in sequence through a pipeline. The normally closed connection valve communicates with the second communication valve of the common section; the second steering assist member communicates with the first communication valve of the common section to form a second circuit with the common section; thus, a single oil circuit is shared with the front axle oil supply circuit. Additionally, under normal conditions, the normally closed connection valve is closed, and the second circuit is only connected when rear axle steering is required. Therefore, whether the second circuit is connected or not does not affect the oil supply of the first circuit; during use, since a single steering oil tank and a steering oil pump are shared, the pressure and oil quality can be ensured to be consistent, avoiding the pressure and oil quality differences of two oil supply systems, thus ensuring coordination and synchronization; moreover, more importantly, costs are also reduced, and two pressure sources for oil supply are avoided to reduce the occupation of vehicle space. Thus, sharing a single steering oil pump can reduce power consumption. Additionally, the above control processes are all controlled by a control device. With an appropriate control strategy, hydraulic power can be provided during rear axle active steering without additional power consumption.

[0011] In some embodiments, the control device is further configured to be connected to a vehicle front wheel angle sensor and a rear steering machine to obtain the front wheel angle and control the start and stop of the rear steering machine.

[0012] In some embodiments, the control device is further configured to be connected to a locking assembly and a vehicle ECU to lock or unlock the second steering assist member and obtain a vehicle speed signal through the vehicle ECU.

[0013] In some embodiments, the locking assembly includes a steering lock switch, an air pressure valve, and a locking mechanism connected in sequence.

[0014] In some embodiments, both the first communication valve and the second communication valve are three-way valves;

[0015] Pilot valves are provided on the pipelines connected to the three valve ports of the first communication valve and the second communication valve.

[0016] In a second aspect, a control method for a vehicle steering hydraulic pipeline system is provided, which includes the following steps:

[0017] Obtain a steering demand, where the steering demand includes front wheel steering and rear wheel not steering, front wheel steering and rear wheel steering, front wheel not steering and rear wheel not steering, and front wheel not steering and rear wheel steering;

[0018] Use the control device to analyze the steering demand according to a set rule and control the normally closed connection valve according to the analysis result;

[0019] The set rule is:

[0020] If the steering requirement is that the front wheels steer and the rear wheels do not, or that neither the front wheels nor the rear wheels steer, the control device keeps the normally closed connection valve closed;

[0021] If the steering requirement is that the front wheels steer and the rear wheels steer, or that the front wheels do not steer and the rear wheels steer, the control device opens the normally closed connection valve.

[0022] In some embodiments, the control device is further configured to be connected to a front wheel angle sensor of the vehicle and a rear steering machine to obtain the front wheel angle and control the start and stop of the rear steering machine;

[0023] When the steering requirement is that the front wheels steer and the rear wheels do not, or that neither the front wheels nor the rear wheels steer, the rear steering machine is controlled to remain in a stopped state;

[0024] When the steering requirement is that the front wheels steer and the rear wheels steer, according to the front wheel angle, the rear steering machine is controlled to rotate while rotating an angle equal to the front wheel angle, and the angle change speed is equal to the front wheel angle change speed;

[0025] When the steering requirement is that the front wheels do not steer and the rear wheels steer, the rear steering machine is controlled to turn on and rotate a set angle.

[0026] In some embodiments, the control device is further configured to be connected to a locking assembly and a vehicle ECU to lock or unlock the second steering assist member and obtain a vehicle speed signal through the vehicle ECU;

[0027] The setting rules further include:

[0028] If the vehicle speed signal is greater than or equal to a set threshold and the front wheel angle of the vehicle is zero within a set time period, the rear steering machine is controlled to automatically return to the neutral position. After the rear wheels are centered, the normally closed connection valve and the rear steering machine are closed, and the second steering assist member is locked by the locking assembly.

[0029] In some embodiments, the setting rules further include:

[0030] If the vehicle speed signal is greater than the set threshold and the steering requirement is that the front wheels steer and the rear wheels do not, or that neither the front wheels nor the rear wheels steer, the locking assembly is controlled to lock the second steering assist member;

[0031] If the vehicle speed signal is less than the set threshold and the steering requirement is that the front wheels steer and the rear wheels steer, or that the front wheels do not steer and the rear wheels steer, the locking assembly is controlled to unlock the second steering assist member.

[0032] In some embodiments, the set angle, the set threshold, and the set time period are all stored in the vehicle ECU, and the control device calls the set angle, the set threshold, and the set time period when analyzing according to the setting rules.

[0033] The beneficial effects brought by the technical solution provided in this application include:

[0034] An embodiment of this application provides a vehicle steering hydraulic pipeline system and its control method. Due to the setting of a common section, a first oil supply section, and a second oil supply section, the second oil supply section includes a normally closed connection valve and a second steering assist component connected in sequence through a pipeline. The normally closed connection valve communicates with the second communication valve of the common section; the second steering assist component communicates with the first communication valve of the common section to form a second loop with the common section; thus, it shares an oil circuit with the front axle oil supply circuit. Additionally, the normally closed connection valve is closed under normal conditions, and only when rear axle steering is required, the second loop is connected. Therefore, whether the second loop is connected or not does not affect the oil supply of the first loop; during use, since a common steering oil tank and a steering oil pump are shared, the pressure can be ensured to be consistent and the oil quality can be the same, avoiding the pressure and oil quality differences of two oil supply systems. Therefore, the coordination and synchronization are ensured, and the cost and the occupation of vehicle space are also reduced.

[0035] Thus, a common steering oil pump can be shared to reduce power consumption. Additionally, the above control processes are all controlled by a control device. With a suitable control strategy, hydraulic power can be provided during rear axle active steering without additional power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0037] Figure 1 It is a schematic structural diagram of the vehicle steering hydraulic pipeline system provided by the embodiment of this application;

[0038] Figure 2 It is a schematic diagram of the connection relationship between the control device and vehicle components provided by the embodiment of this application;

[0039] Figure 3 It is a schematic diagram of the vehicle in a straight driving state provided by the embodiment of this application;

[0040] Figure 4 It is a schematic diagram of the vehicle in a steering driving state (rear axle locked) provided by the embodiment of this application;

[0041] Figure 5 It is a schematic diagram of the vehicle in a steering driving state (rear axle steering) provided by the embodiment of this application;

[0042] Figure 6 It is a strategy flowchart of the control method of the vehicle steering hydraulic pipeline system provided by the embodiment of this application.

[0043] In the figure: 1. First communication valve; 2. Steering oil tank; 3. Steering oil pump; 4. Second communication valve; 5. First steering assist component; 6. Normally closed connection valve; 7. Second steering assist component; 8. Control device. Specific embodiments

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0045] The embodiments of the present application provide a vehicle steering hydraulic pipeline system and its control method to solve the problem of differences in coordination and synchronization when controlling two sets of steering oil pumps in the related art.

[0046] The vehicle steering hydraulic pipeline system of the present application is applicable to the hydraulic pipeline of a rear axle steering system and a vehicle with active steering and return functions that have been proposed, that is, a hydraulic pipeline system specifically matched for the proposed application. Specifically, it is a hydraulic power source that provides assistance to the driving device therein. The driving device includes a steering gear body, a steering gear mounting hole, a motor device, and steering gear fixing bolts; a motor device is arranged at the input shaft end of the steering gear body, and the output shaft on the steering gear body is used to connect to a steering pitman arm device; the motor device is provided with an electronic control component, and the electronic control component is used to control the rotation angle of the input shaft of the steering gear body to control the steering pitman arm device; the steering gear body is connected to a steering gear bracket through a steering gear mounting hole and a steering gear fixing bolt; the steering pitman arm device includes a steering pitman arm, one end of the steering pitman arm is connected to the output shaft on the steering gear body through a steering pitman arm locking nut, and the other end of the steering pitman arm extends out of the swing space of the pitman arm and is connected to a steering gear tie rod.

[0047] Since front axle steering and rear axle steering generally require two sets of oil pumps and pipeline systems to provide hydraulic assistance; however, the front and rear steering systems respectively adopt two sets of steering oil pumps and steering hydraulic pipeline systems, and there are differences in the oil pressure and oil products in the two sets of steering oil pumps during use, resulting in differences in coordination and synchronization during control; the two sets of steering oil pumps and steering hydraulic pipeline systems lead to high production costs and many components. In addition, due to limited vehicle space, there are also great difficulties in layout and assembly;

[0048] Furthermore, existing front and rear steering systems generally have the following two operating states: straight driving state and steering state. There are two situations: ① The front wheels steer while the rear wheels do not; ② The front wheels steer and the rear wheels steer. Then the two systems need to be jointly controlled, and there is a time difference in the front and rear steering drives, which needs to be ensured.

[0049] A rear axle steering system and a vehicle with active steering and straightening functions applicable to this application. The rear steering system has high performance in active steering and straightening. The front and rear steering systems have the following four operating states: Refer to Figures 2 - 5 ;

[0050] State 1: The front wheels steer and the rear wheels do not;

[0051] State 2: The front wheels do not steer and the rear wheels do not;

[0052] State 3: The front wheels steer and the rear wheels steer;

[0053] State 4: The front wheels do not steer and the rear wheels steer.

[0054] Therefore, for the above four states, using the existing two control systems, the defect of the time difference in the front and rear steering drives is more obvious. Through our research, we found that the pressure and oil quality differences of the oil supply systems, as well as the complex structure of the pipelines, are important reasons for this. Therefore, the solution of this application came into being.

[0055] Refer to Figures 1 - 2 , a vehicle steering hydraulic pipeline system, which includes: a common section, a first oil supply section, and a second oil supply section.

[0056] The common section includes a first connection valve 1, a steering oil tank 2, a steering oil pump 3, and a second connection valve 4 that are sequentially connected through pipelines;

[0057] The first oil supply section includes a first steering assist member 5 for connecting to the vehicle's front wheels. The input end of the first steering assist member 5 is connected to the second connection valve 4 through a pipeline, and the output end of the first steering assist member 5 is connected to the first connection valve 1 through a pipeline to form a first circuit with the common section;

[0058] The second oil supply section includes a normally closed connection valve 6 and a second steering assist member 7 that are sequentially connected through pipelines, that is, the output end of the normally closed connection valve 6 is connected to the input end of the second steering assist member 7, and the input end of the normally closed connection valve 6 is connected to the second connection valve 4; the output end of the second steering assist member 7 is connected to the first connection valve 1 to form a second circuit with the common section; both the first connection valve 1 and the second connection valve 4 are three-way valves.

[0059] The control device 8 is connected to the normally closed connection valve 6 and is used to control the opening or closing of the normally closed connection valve 6 to connect or disconnect the second circuit.

[0060] With the above structural settings, due to the setting of the common section, the first oil supply section and the second oil supply section, the second oil supply section includes a normally closed connection valve 6 and a second steering assist member 7 connected in sequence through a pipeline. The normally closed connection valve 6 communicates with the second communication valve 4 of the common section; the second steering assist member 7 communicates with the first communication valve 1 of the common section to form a second circuit with the common section; thus sharing an oil circuit with the front axle oil supply circuit. Additionally, under normal conditions, the normally closed connection valve 6 is closed, and the second circuit is only connected when rear axle steering is required. Therefore, whether the second circuit is connected or not does not affect the oil supply of the first circuit; during use, since a common steering oil tank and a steering oil pump are shared, the pressure and oil quality can be ensured to be consistent, avoiding the pressure and oil quality differences of two oil supply systems, thus ensuring coordination and synchronization; moreover, more importantly, the cost is also reduced, and two pressure sources for oil supply are avoided to reduce the occupation of vehicle space. Thus, sharing a steering oil pump can reduce power consumption. Additionally, the above control processes are all controlled by the control device 8. With a suitable control strategy, hydraulic power can be provided during rear axle active steering without additional power consumption.

[0061] As Figure 2 shown, in some preferred embodiments, the control device 8 is further configured to be connected to the vehicle front wheel angle sensor and the rear steering machine to obtain the front wheel angle and control the start and stop of the rear steering machine; the control device 8 is further configured to be connected to the locking assembly and the vehicle ECU to lock or unlock the second steering assist member 7 and obtain the vehicle speed signal through the vehicle ECU; the locking assembly includes a steering lock switch, an air pressure valve, and a locking mechanism connected in sequence.

[0062] The above settings enable the control device 8 to actively unlock and lock in combination with the vehicle's motion state, and perform active rear axle steering when unlocked, avoiding the problem of tire wear to a certain extent that the wheels of the follow-up steering are passively dragged and rotated. For the specific control strategy, refer to the description of the control strategy later.

[0063] In some preferred embodiments, both the first communication valve 1 and the second communication valve 4 are three-way valves; pilot valves are provided on the pipelines connected to the three valve ports of the first communication valve 1 and the second communication valve 4 to avoid liquid backflow and pressure fluctuations. The normally closed connection valve is a normally closed solenoid valve.

[0064] In the above process, the specific structure of the vehicle steering hydraulic pipeline system has been introduced. Next, the control strategy will be described, that is, how to provide active steering or how to specifically control active steering.

[0065] Refer to Figure 6 , this application also proposes a control method for a vehicle steering hydraulic pipeline system, which includes the following steps:

[0066] Step S01: Obtain the steering requirement, where the steering requirement includes front-wheel steering and rear-wheel non-steering, front-wheel steering and rear-wheel steering, front-wheel non-steering and rear-wheel non-steering, and front-wheel non-steering and rear-wheel steering;

[0067] Step S02: Use the control device 8 to analyze the steering requirement according to the set rules, and control the normally closed connection valve 6 according to the analysis result;

[0068] The set rules are as follows:

[0069] If the steering requirement is front-wheel steering and rear-wheel non-steering, and front-wheel non-steering and rear-wheel non-steering, the control device 8 will keep the normally closed connection valve 6 closed;

[0070] If the steering requirement is front-wheel steering and rear-wheel steering, and front-wheel non-steering and rear-wheel steering, the control device 8 will open the normally closed connection valve 6.

[0071] The above control process realizes the function that the hydraulic control of the front and rear wheel steering does not affect each other. In addition, the rear axle can be steered independently, providing more operating space for the vehicle's operation mode.

[0072] Furthermore, the control device 8 is also used to connect with the vehicle front-wheel angle sensor and the rear steering machine to obtain the front-wheel angle and control the start and stop of the rear steering machine; the set rules are specifically:

[0073] When the steering requirement is front-wheel steering and rear-wheel non-steering, and front-wheel non-steering and rear-wheel non-steering, the rear steering machine is controlled to remain in the stopped state;

[0074] When the steering requirement is front-wheel steering and rear-wheel steering, according to the front-wheel angle, the rear steering machine is controlled to rotate at the same angle as the front-wheel angle, and the angle change speed is equal to the front-wheel angle change speed;

[0075] When the steering requirement is front-wheel non-steering and rear-wheel steering, the rear steering machine is controlled to open and rotate a set angle.

[0076] Furthermore, the control device 8 is also used to connect with the locking component and the vehicle ECU to lock or unlock the second steering assist component 7, and obtain the vehicle speed signal through the vehicle ECU;

[0077] The set rules also include:

[0078] If the vehicle speed signal is greater than or equal to the set threshold, and the front-wheel angle of the vehicle is zero within the set time period, the rear steering machine is controlled to automatically return to the straight position. After the rear wheels are centered, the normally closed connection valve 6 and the rear steering machine are closed, and the second steering assist component 7 is locked by the locking component.

[0079] The set rules also include:

[0080] If the vehicle speed signal is greater than the set threshold, and the steering demand is that the front wheels steer and the rear wheels do not steer, and the front wheels do not steer and the rear wheels do not steer, then control the locking component to lock the second steering assist member 7; if the vehicle speed signal is less than the set threshold, and the steering demand is that the front wheels steer and the rear wheels steer, and the front wheels do not steer and the rear wheels steer, then control the locking component to unlock the second steering assist member 7.

[0081] The set angle, the set threshold, and the set time period are all stored in the vehicle ECU, and the control device 8 calls the set angle, the set threshold, and the set time period when analyzing according to the set rules.

[0082] The above has explained how to perform specific operations of the front-wheel steering and rear-wheel steering according to different steering demands during the actual use process. It should be understood that the above steering demands are all set in advance and stored in the control device 8. The control device 8 can be the vehicle's on-board computer or an additionally installed control device, which has buttons or an operation screen, so as to facilitate the driver to select the required mode.

[0083] In summary, a hydraulic pipeline system for a vehicle with an active steering function is provided both in terms of hardware and software. This pipeline system can cope with different steering demands, and can ensure consistent pressure and consistent oil quality, avoiding the pressure and oil quality differences of two oil supply systems, ensuring coordination and synchronization; more importantly, it also reduces costs, avoids setting two pressure sources for oil supply, reduces the occupation of vehicle space, and thus shares a steering oil pump, which can reduce power consumption. In addition, the above control process is all controlled by the control device 8, and with a suitable control strategy, it can provide hydraulic power during the active steering of the rear axle without additional power consumption.

[0084] A specific embodiment is given below, working mode:

[0085] The rear steering gear relies on the steering oil pump 3 to provide hydraulic assistance; the normally closed connection valve 6 and the second steering assist member 7 receive working signals at the same time: the normally closed connection valve 6 opens, and the oil in the second circuit starts to flow, generating hydraulic pressure to provide hydraulic assistance for the second steering assist member 7; the normally closed connection valve 6 closes, the oil in the second circuit stops flowing, the hydraulic pressure in the rear system disappears, and the rear steering gear stops working.

[0086] When the rear steering gear, that is, the second steering assist member 7, is working (active steering or return of the rear axle, non-locked state of the rear steering axle), the normally closed connection valve 6 is in the open state, and the oil in the rear axle pipeline flows. As Figure 2As shown, while the front axle is steering, the rear axle actively steers / actively returns to the straight position according to the steering amplitude of the front axle. When the second steering assist component 7, i.e., the rear steering gear, stops working (the rear steering axle is in the locked state), the normally closed connection valve 6 is in the closed state, and the hydraulic fluid in the second circuit, i.e., the rear axle pipeline, is stationary.

[0087] Control method: When the vehicle speed ≥ 20 km / h and the vehicle is driving straight for 5 seconds, the rear axle automatically returns to the straight position. After the rear axle is centered, the rear axle is locked; at the same time, the rear steering gear stops working and the pipeline solenoid valve is closed.

[0088] When the vehicle speed < 20 km / h and the rear axle has a steering requirement, under the condition that the rear axle is unlocked, the rear axle actively steers, the pipeline solenoid valve is opened, and the rear wheel steering angle corresponds to and matches the front wheel steering angle.

[0089] Principle of this application:

[0090] (1) Due to the setting of the common section, the first oil supply section and the second oil supply section, the second oil supply section includes a normally closed connection valve 6 and a second steering assist component 7 connected in sequence through a pipeline. The normally closed connection valve 6 is connected to the second connection valve 4 of the common section; the second steering assist component 7 is connected to the first connection valve 1 of the common section to form a second circuit with the common section; thus sharing an oil circuit with the front axle oil supply circuit. Additionally, under normal conditions, the normally closed connection valve 6 is closed, and the second circuit is only connected when rear axle steering is required. Therefore, whether the second circuit is connected or not does not affect the oil supply of the first circuit; during use, since a common steering oil tank and a steering oil pump are shared, the pressure can be ensured to be consistent and the oil quality can be the same, avoiding the pressure and oil quality differences of two oil supply systems, thus ensuring coordination and synchronization; moreover, more importantly, the cost is also reduced, and the setting of two pressure sources for oil supply is avoided to reduce the occupation of vehicle space. Thus, sharing a steering oil pump can reduce power consumption. Additionally, the above control process is all controlled by the control device 8. With a suitable control strategy, hydraulic power can be provided during the active steering of the rear axle without additional power consumption.

[0091] This application also provides a computer-readable storage medium, on which computer-executable instructions are stored. The computer-executable instructions are executed by a processor and are used to control the control strategy of the hydraulic pipeline described in the above embodiments.

[0092] The computer-readable storage medium in this embodiment can be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., an SSD), etc.

[0093] Those of ordinary skill in the art will understand that all or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps including those of the above method embodiments; and the foregoing storage medium includes: various media such as ROM, RAM, magnetic disk, or optical disc that can store program code.

[0094] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are performed on the computer or other programmable device to generate computer-implemented processing. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one process Figure 1 one process or multiple processes and / or boxes Figure 1 or multiple boxes. In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and memory. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM), and / or non-volatile memory in the form of, for example, read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0095] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0096] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0097] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A vehicle steering hydraulic pipeline system, characterized in that, It includes: A common section, which includes a first connection valve (1), a steering oil tank (2), a steering oil pump (3), and a second connection valve (4) connected in sequence through a pipeline; A first oil supply section, which includes a first steering assist component (5) for connecting with the vehicle's front wheels. The input end of the first steering assist component (5) is connected to the second connection valve (4) through a pipeline, and the output end of the first steering assist component (5) is connected to the first connection valve (1) through a pipeline to form a first loop with the common section; A second oil supply section, which includes a normally closed connection valve (6) and a second steering assist component (7) connected in sequence through a pipeline. The normally closed connection valve (6) is communicated with the second connection valve (4); the second steering assist component (7) is communicated with the first connection valve (1) to form a second loop with the common section; A control device (8), which is connected to the normally closed connection valve (6) and is used to control the opening or closing of the normally closed connection valve (6) to connect or disconnect the second loop; Both the first connection valve (1) and the second connection valve (4) are three-way valves; Guide valves are provided on the pipelines connected to the three valve ports of the first connection valve (1) and the second connection valve (4).

2. The vehicle steering hydraulic pipeline system according to claim 1, characterized in that: The control device (8) is further used to connect with a vehicle front wheel angle sensor and a rear steering machine to obtain the front wheel angle and control the start and stop of the rear steering machine.

3. The vehicle steering hydraulic pipeline system according to claim 2, characterized in that: The control device (8) is further used to connect with a locking assembly and a vehicle ECU to lock or unlock the second steering assist component (7) and obtain a vehicle speed signal through the vehicle ECU.

4. The vehicle steering hydraulic pipeline system according to claim 3, characterized in that: The locking assembly includes a steering lock switch, an air pressure valve, and a locking mechanism connected in sequence.

5. A control method for a vehicle steering hydraulic pipeline system as claimed in claim 1, characterized in that, It includes the following steps: Obtain a steering demand, where the steering demand includes front wheel steering and rear wheel non-steering, front wheel steering and rear wheel steering, front wheel non-steering and rear wheel non-steering, and front wheel non-steering and rear wheel steering; Use the control device (8) to analyze the steering demand according to a set rule and control the normally closed connection valve (6) according to the analysis result; The set rule is: If the steering demand is front wheel steering and rear wheel non-steering, and front wheel non-steering and rear wheel non-steering, the control device (8) keeps the normally closed connection valve (6) closed; If the steering demand is front wheel steering and rear wheel steering, and front wheel non-steering and rear wheel steering, the control device (8) opens the normally closed connection valve (6).

6. The control method of the vehicle steering hydraulic pipeline system according to claim 5, characterized in that: The control device (8) is further used to connect with a vehicle front wheel angle sensor and a rear steering machine to obtain the front wheel angle and control the start and stop of the rear steering machine; When the steering demand is front wheel steering and rear wheel non-steering, and front wheel non-steering and rear wheel non-steering, then control the rear steering machine to remain in a stopped state; When the steering requirement is front-wheel steering and rear-wheel steering, according to the front-wheel angle, control the rear steering gear to rotate while rotating an angle equal to the front-wheel angle, and the angle change speed is equal to the front-wheel angle change speed; When the steering requirement is front-wheel non-steering and rear-wheel steering, control the rear steering gear to be turned on and rotate a set angle.

7. The control method of the vehicle steering hydraulic pipeline system according to claim 6, characterized in that: The control device (8) is further configured to be connected to the locking component and the vehicle ECU to lock or unlock the second steering assist member (7), and obtain a vehicle speed signal through the vehicle ECU; The setting rule further includes: If the vehicle speed signal is greater than or equal to the set threshold, and the front-wheel angle of the vehicle is zero within the set time period, control the rear steering gear to automatically return to the straight position. After the rear wheels are centered, close the normally closed connection valve (6) and the rear steering gear, and use the locking component to lock the second steering assist member (7).

8. The control method of the vehicle steering hydraulic pipeline system according to claim 7, characterized in that: The setting rule further includes: If the vehicle speed signal is greater than the set threshold, and the steering requirement is front-wheel steering and rear-wheel non-steering and front-wheel non-steering and rear-wheel non-steering, control the locking component to lock the second steering assist member (7); If the vehicle speed signal is less than the set threshold, and the steering requirement is front-wheel steering and rear-wheel steering and front-wheel non-steering and rear-wheel steering, control the locking component to unlock the second steering assist member (7).

9. The control method of the vehicle steering hydraulic pipeline system according to claim 7, characterized in that: The set angle, set threshold and set time period are all stored in the vehicle ECU, and the control device (8) calls the set angle, set threshold and set time period when analyzing according to the set rule.

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