Vehicle steering system, control method and vehicle

Abstract

The invention provides a vehicle steering system, a control method and a vehicle. The input end of an oil pump in the vehicle steering system is connected with an oil tank, and the output end of the oil pump is connected with a steering execution mechanism through an oil inlet pipeline; the steering executing mechanism is connected with the oil tank through an oil return pipeline; the oil inlet pipeline is connected with the oil return pipeline through a stop valve group; after the vehicle is started, the oil pump conveys oil in the oil tank into the oil inlet pipeline; after the vehicle is started, if it is detected that all stop valves in the stop valve set do not have closing faults and at least one target stop valve without opening faults exists in the stop valve set, the controller controls all the stop valves, except the target stop valves, in the stop valve set to be in a closed state; and the oil pressure in the vehicle steering system is adjusted by controlling the on-off state of the target stop valve. The operation safety and reliability of the steering system can be improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a vehicle steering system, a control method and a vehicle. Background Art

[0002] At present, when a vehicle driver controls the vehicle to turn, the hydraulic steering system in the vehicle is often required to assist the steering. The existing hydraulic system outputs oil through an oil pump to provide flow, and a single shut-off valve changes the flow direction of the oil output by the oil pump, thereby achieving control over the vehicle's steering.

[0003] Existing hydraulic steering systems often control the switching state of the stop valve through the signal of the vehicle angle sensor to control the steering of the vehicle. However, when the vehicle is in a condition where continuous small-angle steering is required, the stop valve will be frequently switched on and off, which may easily cause a single stop valve in the system to fail to open, resulting in steering system failure and poor steering system operation safety. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a vehicle steering system, a control method and a vehicle, which can improve the safety of the steering system. The specific scheme is as follows:

[0005] According to a first aspect of an embodiment of the present invention, there is provided a vehicle steering system, comprising:

[0006] An oil tank, an oil pump, a stop valve group, a steering actuator and a controller, wherein the stop valve group includes a plurality of parallel stop valves;

[0007] The input end of the oil pump is connected to the oil tank, and the output end of the oil pump is connected to the steering actuator through an oil inlet pipeline; the steering actuator is connected to the oil tank through an oil return pipeline; the oil inlet pipeline and the oil return pipeline are connected through the stop valve group;

[0008] The oil pump is used to transport the oil in the oil tank to the oil inlet pipeline after the vehicle is started;

[0009] The controller is used to control all the stop valves in the stop valve group except the target stop valve to be in a closed state after the vehicle is started, if it is detected that none of the stop valves in the stop valve group has a closing fault and there is at least one target stop valve in the stop valve group without an opening fault, and adjust the oil pressure in the vehicle steering system by controlling the switching state of the target stop valve.

[0010] In the above vehicle steering system, optionally, the controller is used to:

[0011] Sending a first control instruction to each stop valve in the stop valve group, wherein the first control instruction is used to instruct the stop valve to close;

[0012] detecting whether the oil pressure in the vehicle steering system increases;

[0013] If it is detected that the oil pressure in the vehicle steering system increases, it is determined that none of the stop valves in the stop valve group has a closing fault.

[0014] In the above vehicle steering system, optionally, the controller is used to:

[0015] After determining that none of the stop valves in the stop valve group has a closing fault, performing a detection operation on each of the stop valves in turn;

[0016] The detection operation includes: sending a second control instruction to the stop valve, wherein the second control instruction is used to instruct the stop valve to open; if it is detected that the oil pressure in the vehicle steering system decreases, determining that the stop valve is a target stop valve in the stop valve group without an opening fault; otherwise, determining that the stop valve has an opening fault; and sending the first control instruction to the stop valve.

[0017] In the above vehicle steering system, optionally, the controller is used to:

[0018] When it is detected that any of the stop valves has an opening failure and / or a closing failure, alarm information of the stop valve failure is output.

[0019] In the above vehicle steering system, optionally, the controller is used to:

[0020] Detecting whether the vehicle has a steering demand and obtaining a detection result;

[0021] The switch state of the target cut-off valve is controlled according to the detection result to adjust the oil pressure in the vehicle steering system.

[0022] In the above vehicle steering system, optionally, the controller is used to:

[0023] If the detection result indicates that the vehicle has a steering demand, controlling the target cut-off valve to be in a closed state to increase the oil pressure in the vehicle steering system;

[0024] If the detection result indicates that there is no steering demand for the vehicle, then when it is detected that the oil pressure in the vehicle steering system is greater than a preset pressure threshold, the target cut-off valve is controlled to be in an open state to reduce the oil pressure in the vehicle steering system.

[0025] In the above vehicle steering system, optionally, the controller is used to:

[0026] Whether the vehicle has a steering demand is detected according to the opening degree of the steering proportional valve in the vehicle.

[0027] In the above vehicle steering system, optionally, the controller is used to:

[0028] If it is detected that the opening of the steering proportional valve in the vehicle is greater than a preset opening threshold, it is determined that the vehicle has a steering demand;

[0029] If it is detected that the opening of the steering proportional valve in the vehicle is not greater than a preset opening threshold, it is determined that there is no steering demand for the vehicle.

[0030] According to a second aspect of an embodiment of the present invention, a control method is provided, which is applied to a controller in a vehicle steering system, wherein an input end of an oil pump in the vehicle steering system is connected to an oil tank, and an output end of the oil pump is connected to a steering actuator in the vehicle steering system through an oil inlet pipeline; the steering actuator is connected to the oil tank through an oil return pipeline; the oil inlet pipeline and the oil return pipeline are connected through a shut-off valve group in the vehicle steering system; the shut-off valve group includes a plurality of shut-off valves connected in parallel; the method comprises:

[0031] After the vehicle is started, if it is detected that none of the stop valves in the stop valve group has a closing fault, and there is at least one target stop valve in the stop valve group that has no opening fault, then all the stop valves in the stop valve group except the target stop valve are controlled to be in a closed state, and the oil pressure in the vehicle steering system is adjusted by controlling the switching state of the target stop valve.

[0032] According to a second aspect of an embodiment of the present invention, a vehicle is provided, comprising the vehicle steering system as described above.

[0033] Based on the vehicle steering system, control method and vehicle provided by the above embodiment of the present invention, the input end of the oil pump in the vehicle steering system is connected to the oil tank, and the output end of the oil pump is connected to the steering actuator through an oil inlet pipeline; the steering actuator is connected to the oil tank through an oil return pipeline; the oil inlet pipeline and the oil return pipeline are connected through a stop valve group; after the vehicle is started, the oil pump transports the oil in the oil tank to the oil inlet pipeline; after the vehicle is started, if the controller detects that none of the stop valves in the stop valve group has a closing fault, and there is at least one target stop valve without an opening fault in the stop valve group, then the stop valves in the stop valve group except the target stop valve are controlled to be in a closed state, and the oil pressure in the vehicle steering system is adjusted by controlling the switch state of the target stop valve. The system provided by the embodiment of the present invention is applied, and the oil inlet pipeline and the oil return pipeline are connected by a stop valve group including a plurality of parallel stop valves, so that in the case of an opening fault of some stop valves in the stop valve group, the normal operation of the steering system can still be guaranteed, and the safety and operational reliability of the steering system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0035] Figure 1 A schematic structural diagram of a vehicle steering system provided by the present invention;

[0036] Figure 2 A method flow chart of a control method provided by the present invention;

[0037] Figure 3 A structural example diagram of a stop valve group provided by the present invention;

[0038] Figure 4 A flow chart of a process for performing fault detection on a stop valve provided by the present invention;

[0039] Figure 5 An example diagram of a stop valve signal provided by the present invention;

[0040] Figure 6 An example diagram of system pressure change provided by the present invention;

[0041] Figure 7 A flow chart of a stop valve control process provided by the present invention;

[0042] Figure 8An example diagram of a proportional valve opening signal provided by the present invention;

[0043] Fig. 9 An example diagram of a stop valve opening signal provided by the present invention;

[0044] Fig.10 Another example diagram of system pressure change provided by the present invention;

[0045] Fig.11 An example diagram of a wheel turning angle provided by the present invention;

[0046] Fig.12 A schematic diagram of a vehicle structure provided by the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0049] At present, when a vehicle driver controls the vehicle to turn, the hydraulic steering system in the vehicle is often required to assist the steering. The existing hydraulic system outputs oil through an oil pump to provide hydraulic pressure, and a single shut-off valve changes the flow direction of the oil output by the oil pump, thereby achieving control over the vehicle's steering.

[0050] Existing hydraulic steering systems often control the switching state of the stop valve through the signal of the vehicle's steering angle sensor to control the steering of the vehicle. However, when the vehicle is in a condition where continuous small-angle steering is required, the stop valve will be frequently switched on and off, which may easily cause a single stop valve in the system to fail, resulting in steering system failure.

[0051] Based on this, see Figure 1 , is a schematic diagram of the structure of a vehicle steering system provided by an embodiment of the present invention, the vehicle steering system comprising:

[0052] An oil tank 101 , an oil pump 102 , a shut-off valve group 103 , a steering actuator 104 and a controller 105 , wherein the shut-off valve group 103 includes a plurality of shut-off valves connected in parallel.

[0053] The input end of the oil pump 102 is connected to the oil tank 101, and the output end of the oil pump 102 is connected to the steering actuator 104 through an oil inlet pipeline; the steering actuator 104 is connected to the oil tank 101 through an oil return pipeline; the oil inlet pipeline and the oil return pipeline are connected through a stop valve group 103. In this embodiment, the oil tank is used to store oil.

[0054] The oil pump 102 is used to transport the oil in the fuel tank 101 to the oil inlet pipeline after the vehicle is started. In this embodiment, the oil pump may include one or more of a fixed-displacement pump and a variable-displacement pump. After the vehicle is started, when the vehicle steering system does not receive a steering command, the oil pump may operate at a preset initial speed to transport the oil in the fuel tank to the oil inlet pipeline. The initial speed may be the minimum speed of the oil pump.

[0055] Optionally, the oil pump can output oil to the steering actuator through the oil inlet pipeline to drive the steering actuator to perform steering movement.

[0056] In this embodiment, the steering actuator may include a hydraulic valve, a hydraulic cylinder and a wheel, etc. The hydraulic valve can be used to control the opening size of the oil circuit and the hydraulic cylinder. The hydraulic cylinder and the wheel are connected by a connecting rod, and the steering angle of the wheel is controlled by controlling the piston movement of the hydraulic cylinder.

[0057] In this embodiment, the shut-off valve group can be used to change the flow direction of the oil, thereby adjusting the hydraulic pressure in the vehicle steering system.

[0058] The controller is used to control all the stop valves in the stop valve group except the target stop valve to be in a closed state after the vehicle is started, if it is detected that none of the stop valves in the stop valve group has a closing fault and there is at least one target stop valve in the stop valve group without an opening fault, and adjust the oil pressure in the vehicle steering system by controlling the switching state of the target stop valve.

[0059] In this embodiment, after the target stop valve is opened, the oil output by the oil pump into the oil inlet pipeline will flow into the oil return pipeline through the target stop valve; after the target stop valve is closed, the oil output by the oil pump will enter the steering actuator through the oil inlet pipeline, thereby driving the steering actuator to perform steering movement.

[0060] Optionally, the number of the target shut-off valves may be one or more.

[0061] The system provided by the embodiment of the present invention connects the oil inlet pipeline and the oil return pipeline through a shut-off valve group including a plurality of shut-off valves connected in parallel, so that in the event that some of the shut-off valves in the shut-off valve group fail to open, the normal operation of the steering system can still be guaranteed, thereby improving the safety and operational reliability of the steering system.

[0062] In one embodiment provided by the present invention, based on the above-mentioned scheme, optionally, the controller in the steering system can be used to send a first control instruction to each stop valve in the stop valve group, and the first control instruction is used to instruct the stop valve to close; detect whether the oil pressure in the vehicle steering system increases; if it is detected that the oil pressure in the vehicle steering system increases, it is determined that none of the stop valves in the stop valve group has a closing fault.

[0063] In this embodiment, since the oil pump runs at a preset speed after the vehicle is started, it will continue to transport the oil in the oil tank to the oil inlet line. If one or more stop valves have a closing failure, the oil in the oil inlet line will enter the oil return line through the stop valve with the closing failure, so that the oil pressure in the vehicle steering system cannot be increased; therefore, by sending a first control instruction to each stop valve in the stop valve group and detecting whether the oil pressure in the vehicle steering system increases, it can be determined whether there is a stop valve with a closing failure in the stop valve group.

[0064] In some embodiments, after sending a first control instruction to each stop valve in the stop valve group, it can be detected whether the oil pressure in the vehicle steering system increases by a preset value within a preset time. If it increases by the preset value, it can be determined that none of the stop valves in the stop valve group has a closing fault.

[0065] In an embodiment provided by the present invention, based on the above-mentioned scheme, optionally, the controller is used to: after determining that none of the shut-off valves in the shut-off valve group has a closing fault, perform a detection operation on each of the shut-off valves in turn; the detection operation includes: sending a second control instruction to the shut-off valve, the second control instruction is used to instruct the shut-off valve to open; if it is detected that the oil pressure in the vehicle steering system decreases, determining that the shut-off valve is a target shut-off valve in the shut-off valve group that has no opening fault; otherwise, determining that the shut-off valve has an opening fault; and sending the first control instruction to the shut-off valve.

[0066] In this embodiment, after it is detected that none of the shut-off valves in the shut-off valve group has a closing fault, since each shut-off valve is in a closed state, the oil pump continues to work so that the hydraulic pressure in the oil system increases; if one of the shut-off valves is in an open state, the oil in the oil inlet pipeline will enter the oil return pipeline through the shut-off valve in the open state, so that the oil pressure in the oil system decreases; therefore, a second control instruction is sent to one of the shut-off valves in the shut-off valve group, and it is detected whether the oil pressure in the vehicle steering system decreases, so that it can be determined whether the shut-off valve is opened normally. If the oil pressure decreases, it is determined that the shut-off valve is opened, that is, there is no opening fault. If the oil pressure does not decrease, it is determined that the shut-off valve is not successfully opened, that is, there is an opening fault.

[0067] In an embodiment provided by the present invention, based on the above solution, optionally, the controller is used to:

[0068] When it is detected that any of the stop valves has an opening failure and / or a closing failure, alarm information of the stop valve failure is output.

[0069] In this embodiment, if at least one stop valve in the stop valve group has a closing failure, or all the stop valves have an opening failure, a first alarm message can be output, and the first alarm message can be used to indicate that the stop valve group cannot operate normally; if none of the stop valves in the stop valve group has a failure, and some of the stop valves have an opening failure, a second alarm message can be output; the second alarm message can be used to indicate that the stop valve group can operate normally, but some of the stop valves have an opening failure; by outputting the alarm message, the user can be prompted to repair or replace the faulty stop valve.

[0070] In some embodiments, after the vehicle is started, the controller can detect whether the oil pressure in the vehicle steering system is greater than a preset first threshold value. If it is greater than the preset first threshold value, the target stop valve can be controlled to open; detect whether the oil pressure in the vehicle steering system is less than a preset second threshold value. If it is less than the preset second threshold value, the target stop valve can be controlled to close; optionally, the second threshold value can be less than or equal to the first threshold value.

[0071] In an embodiment provided by the present invention, based on the above solution, optionally, the controller is used to:

[0072] Detecting whether the vehicle has a steering demand and obtaining a detection result;

[0073] The switch state of the target cut-off valve is controlled according to the detection result to adjust the oil pressure in the vehicle steering system.

[0074] In this embodiment, the detection result can indicate whether the vehicle has a steering demand or not, and the switch state of the target shut-off valve can be controlled according to the detection result to adjust the oil pressure in the vehicle steering system.

[0075] In an embodiment provided by the present invention, based on the above solution, optionally, the controller is used to:

[0076] If the detection result indicates that the vehicle has a steering demand, controlling the target cut-off valve to be in a closed state to increase the oil pressure in the vehicle steering system;

[0077] If the detection result indicates that there is no steering demand for the vehicle, then when it is detected that the oil pressure in the vehicle steering system is greater than a preset pressure threshold, the target cut-off valve is controlled to be in an open state to reduce the oil pressure in the vehicle steering system.

[0078] In this embodiment, when the vehicle has no steering demand, the controller will open the target stop valve to implement pressure protection and prevent the oil pressure in the vehicle steering system from being too high. When there is a steering demand, the controller will close the target stop valve to increase the system pressure and improve the response speed of the actuator. That is, the stop valve is opened when there is no steering demand to implement idle system pressure protection, and when there is a steering demand, the system pressure is increased, which avoids the problem of loss of system components when the system is under high oil pressure for a long time and also improves the safety of the system.

[0079] In an embodiment provided by the present invention, based on the above solution, optionally, the controller is used to:

[0080] Whether the vehicle has a steering demand is detected according to the opening degree of the steering proportional valve in the vehicle.

[0081] In this embodiment, whether the vehicle has a steering demand is detected based on the opening of the steering proportional valve in the vehicle, thereby controlling the switching state of the target stop valve. This can avoid the frequent switching of the stop valve caused by controlling according to the angle command in the prior art, and can effectively improve the service life of the stop valve.

[0082] In an embodiment provided by the present invention, based on the above solution, optionally, the controller is used to:

[0083] If it is detected that the opening of the steering proportional valve in the vehicle is greater than a preset opening threshold, it is determined that the vehicle has a steering demand;

[0084] If it is detected that the opening of the steering proportional valve in the vehicle is not greater than a preset opening threshold, it is determined that there is no steering demand for the vehicle.

[0085] In this embodiment, the opening threshold can be determined according to the dead zone value of the steering proportional valve. For example, the opening threshold=the dead zone value of the steering proportional valve*(1+6%).

[0086] Optionally, the steering proportional valve includes a left turn function and a right turn function.

[0087] The embodiment of the present invention further provides a control method which can be applied to the controller in the above vehicle steering system. The flow chart of the method is as follows: Figure 2 As shown, including:

[0088] S201: After the vehicle is started, each stop valve in the stop valve group is tested for faults.

[0089] S202: If it is detected that none of the stop valves in the stop valve group has a closing fault, and there is at least one target stop valve in the stop valve group that has no opening fault, then all the stop valves in the stop valve group except the target stop valve are controlled to be in a closed state, and the oil pressure in the vehicle steering system is adjusted by controlling the switching state of the target stop valve.

[0090] The implementation process and principle of the control method provided in the embodiment of the present invention can be found in the description of the controller in the vehicle steering system in the above embodiment of the present invention, which will not be repeated here.

[0091] See also Figure 3 , the present invention is described by taking the stop valve group including two stop valves connected in parallel as an example:

[0092] After the vehicle is turned on, if the steering system does not receive a steering command, the oil pump always works at the minimum speed. At this time, the system has no steering command and the actuator is closed. Since the oil pump works at the minimum speed, the pressure inside the system will gradually increase. At this time, the shut-off valve group is opened to reduce the pressure in the system. When the steering system receives a steering command, the system calculates the flow required for the actuator to move. After knowing the required flow of the actuator, the system distributes the required flow to the oil pump and opens the corresponding actuator to implement the steering command.

[0093] In this embodiment, when the vehicle is started, the double stop valve fault self-check function is realized, and the double stop valve fault self-check process is as follows: Figure 4As shown, when the vehicle is powered on, the fault detection function is automatically turned on. First, the double stop valve group is closed to determine whether the pressure in the system increases. If the pressure cannot increase normally, the stop valve group has a closing fault, there is a certain leakage inside the hydraulic system, and the normal steering function cannot be achieved. If the pressure can increase normally, there is no stop valve closing fault. At this time, a signal to open stop valve 1 is given. If the system pressure cannot be reduced normally, stop valve 1 has an opening fault. If the system pressure is reduced, the stop valve has no opening fault. After the system pressure increases normally, stop valve 2 is opened, and the opening fault of stop valve 2 is determined in the same way. When the stop valve group has a closing fault or both stop valves have an opening fault, the system cannot work normally. When the stop valve group has no closing fault and only one stop valve has an opening fault, the normal function of the stop valve without fault is performed.

[0094] For example, when the vehicle starts, the oil pump starts to rotate, the system gradually increases pressure, the stop valve signal 1 is open, 0 is closed, after the vehicle starts, the oil pump is at a constant speed, at this time the two stop valve signals are as follows Figure 5 As shown, the system pressure diagram is as follows Figure 6 As shown, from 0s to 3s, the stop valve is in the open state, and the system pressure is always at a low level. At the 3rd second, the stop valve receives a closing signal, and the pressure in the system gradually increases. When the system pressure increases to 13.6MPa, 1s later, it is determined that the stop valve has no closing failure. At 4.5s, stop valve 1 is opened, and the system pressure drops to 0.3Mpa. It is determined that the stop valve has no opening failure at this time. At the 6th second, stop valve 1 is closed, and the system pressure gradually increases. When it increases to 13.6MPa, 1s later, stop valve 2 is opened, and the system pressure drops to 0.3MPa. It is determined that the stop valve has no opening failure at this time.

[0095] In this embodiment, when the vehicle is started, the oil pump speed is always in the maximum and minimum working range. At this time, if the valve of the valve-controlled cylinder of the actuator is not opened, the oil pressure of the oil system will gradually increase. At this time, the stop valve is used to relieve the pressure to protect the system. Figure 7 As shown in the figure, when the system is working normally, if the pressure in the system reaches a certain threshold, the controller opens the stop valve to release the pressure. When the system has a steering demand, the controller can control the stop valve to close, realize system pressure increase, and drive the actuator to rotate.

[0096] In this embodiment, after receiving a steering request, the controller sends a corresponding opening signal to the proportional valve, causing the proportional valve to gradually open. When the opening of the proportional valve is greater than a certain range of the dead zone value of the proportional valve, it is determined that the system has a steering demand. At this time, the controller opens the shut-off valve group, causing the system to start boosting pressure to drive the actuator to perform the wheel steering function.

[0097] Specifically, the proportional valve opening signals for left and right turns during vehicle steering are as follows: Figure 8 As shown, the system's stop valve opening signal is as follows Fig. 9 As shown, 1 represents the opening signal and 0 represents the closing signal. The system pressure is as follows Fig.10 As shown in Figure 2, the wheel angle diagram is as follows: Fig.11 As shown. At the 148th second, the right turn proportional valve opening of the wheel gradually increases. When the actual opening of the right turn proportional valve is greater than the dead zone value of 6%, the system's stop valve signal is set to 0, the stop valve is closed, and the system pressure gradually increases. At this time, the wheel begins to turn right. At the 150th second, the wheel reaches the target position. At this time, the controller issues a command to set the right turn proportional valve opening to 0, and the steering stops. At this time, the opening of the right turn proportional valve is less than the set threshold, the stop valve is opened, and the system pressure remains at a low state.

[0098] The embodiment of the present invention further provides a vehicle, such as Fig.12 As shown, the vehicle includes the vehicle steering system mentioned above.

[0099] Optionally, the vehicle may be a four-wheeled sedan, a multi-axle vehicle or an engineering vehicle, etc.

[0100] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0101] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0102] For the convenience of description, the above device is described as being divided into various units according to their functions. Of course, when implementing the present invention, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0103] It can be known from the above description of the implementation mode that those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present invention can be essentially or partly contributed to the prior art in the form of a software product, which can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present invention or certain parts of the embodiments.

[0104] The vehicle steering system provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A vehicle steering system, characterized in that: include: An oil tank, an oil pump, a stop valve group, a steering actuator and a controller, wherein the stop valve group includes a plurality of parallel stop valves; The input end of the oil pump is connected to the oil tank, and the output end of the oil pump is connected to the steering actuator through an oil inlet pipeline; the steering actuator is connected to the oil tank through an oil return pipeline; the oil inlet pipeline and the oil return pipeline are connected through the stop valve group; The oil pump is used to transport the oil in the oil tank to the oil inlet pipeline after the vehicle is started; The controller is used to control all the stop valves in the stop valve group except the target stop valve to be in a closed state after the vehicle is started, if it is detected that none of the stop valves in the stop valve group has a closing fault and there is at least one target stop valve in the stop valve group without an opening fault, and adjust the oil pressure in the vehicle steering system by controlling the switching state of the target stop valve.

2. The vehicle steering system according to claim 1, characterized in that: The controller is used to: Sending a first control instruction to each stop valve in the stop valve group, wherein the first control instruction is used to instruct the stop valve to close; detecting whether the oil pressure in the vehicle steering system increases; If it is detected that the oil pressure in the vehicle steering system increases, it is determined that none of the stop valves in the stop valve group has a closing fault.

3. The vehicle steering system according to claim 2, characterized in that: The controller is used to: After determining that none of the stop valves in the stop valve group has a closing fault, performing a detection operation on each of the stop valves in turn; The detection operation includes: sending a second control instruction to the stop valve, wherein the second control instruction is used to instruct the stop valve to open; If it is detected that the oil pressure in the vehicle steering system decreases, the shut-off valve is determined to be a target shut-off valve in the shut-off valve group without an opening fault; otherwise, it is determined that the shut-off valve has an opening fault; and the first control instruction is sent to the shut-off valve.

4. The vehicle steering system according to claim 1, characterized in that: The controller is used to: When it is detected that any of the stop valves has an opening failure and / or a closing failure, alarm information of the stop valve failure is output.

5. The vehicle steering system according to claim 1, characterized in that: The controller is used to: Detecting whether the vehicle has a steering demand and obtaining a detection result; The switch state of the target cut-off valve is controlled according to the detection result to adjust the oil pressure in the vehicle steering system.

6. The vehicle steering system according to claim 5, characterized in that: The controller is used to: If the detection result indicates that the vehicle has a steering demand, controlling the target cut-off valve to be in a closed state to increase the oil pressure in the vehicle steering system; If the detection result indicates that there is no steering demand for the vehicle, then when it is detected that the oil pressure in the vehicle steering system is greater than a preset pressure threshold, the target cut-off valve is controlled to be in an open state to reduce the oil pressure in the vehicle steering system.

7. The vehicle steering system according to claim 5, characterized in that: The controller is used to: Whether the vehicle has a steering demand is detected according to the opening degree of the steering proportional valve in the vehicle.

8. The vehicle steering system according to claim 7, characterized in that: The controller is used to: If it is detected that the opening of the steering proportional valve in the vehicle is greater than a preset opening threshold, it is determined that the vehicle has a steering demand; If it is detected that the opening of the steering proportional valve in the vehicle is not greater than a preset opening threshold, it is determined that there is no steering demand for the vehicle.

9. A control method, characterized in that: A controller applied to a vehicle steering system, wherein the input end of an oil pump in the vehicle steering system is connected to an oil tank, and the output end of the oil pump is connected to a steering actuator in the vehicle steering system through an oil inlet pipeline; the steering actuator is connected to the oil tank through an oil return pipeline; the oil inlet pipeline and the oil return pipeline are connected through a stop valve group in the vehicle steering system; the stop valve group includes a plurality of parallel stop valves; the method includes: After the vehicle is started, if it is detected that none of the stop valves in the stop valve group has a closing fault, and there is at least one target stop valve in the stop valve group that has no opening fault, then all the stop valves in the stop valve group except the target stop valve are controlled to be in a closed state, and the oil pressure in the vehicle steering system is adjusted by controlling the switching state of the target stop valve.

10. A vehicle, characterized in that: Comprising a vehicle steering system as described in any one of claims 1-8.

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