Control method of limited slip differential, vehicle anti-skid system and vehicle

Abstract

The present disclosure relates to a control method for a limited slip differential, a vehicle anti-skid system and a vehicle, the control method comprising: obtaining at least one parameter of whether the limited slip differential is in a first state; and the controller of the limited slip differential sends a signal to a dashboard based on the at least one parameter and displays a prompt message; wherein, in the first state, the limited slip differential cannot reach a predetermined locking torque, and the at least one parameter comprises: a vehicle inclination angle α, a wheel speed difference ΔV=|V1-V2|, V1 is the left wheel speed, and V2 is the right wheel speed. In this way, through the prompt message, the driver is prompted that the limited slip differential cannot work normally, that is, the oil suction port of the limited slip differential cannot suck oil and establish oil pressure, the oil pressure is insufficient, and the limited slip differential cannot reach the required locking torque, thereby causing one side of the wheel to continue to slip, and if the vehicle is operated for a long time, the adjacent friction plates are always in a friction state, and the friction plates will be burned. The driver can stop the operation to reduce the risk of burning the friction plates of the limited slip differential.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle anti-skid systems, and in particular to a control method for a limited slip differential, a vehicle anti-skid system and a vehicle. Background Art

[0002] The limited slip differential is part of the vehicle's transmission system. Its function is to ensure that the transmission system can provide sufficient traction under different road conditions and control the speed difference between the left and right wheels within a certain range to ensure the normal movement of the vehicle. When one of the wheels slips, the limited slip differential can transfer power to the other wheel, so that the slipping wheel will not continue to spin, and the other wheel will also have enough power to help the vehicle move forward and get out of trouble.

[0003] The limited slip differential can adjust the locking coefficient of the differential by controlling the limited slip mechanism, thereby adapting to driving requirements on different road surfaces. Specifically, the controller of the limited slip differential can accurately control the oil pressure acting on the friction plate through the solenoid valve, and ultimately achieve the necessary locking. For example, when the control oil pressure is zero, the limited slip differential is in a closed state, and the multiple friction plates are spaced apart; when the control oil pressure increases, the piston is pushed forward to press the friction plate, thereby achieving partial locking or full locking.

[0004] For some extreme working conditions, since the oil suction port of the differential is on the left side of the bridge package, when the vehicle tilts to the right at a certain angle, the gear oil in the rear axle flows to the right and flows into the right bridge housing. There is no gear oil on the left side, and the oil suction port of the limited slip differential cannot absorb oil and build up oil pressure at this time. The limited slip differential cannot reach the required locking torque, causing the wheel to continue to slip on one side and be unable to get out of trouble. The friction plate inside the limited slip differential is always in a friction state, and the friction plate cannot be pressed tightly. Over time, it will cause the friction plate to burn, and the limited slip differential function will fail. The limited slip mechanism cannot lock the entire differential. Summary of the invention

[0005] The first objective of the present disclosure is to provide a control method for a limited slip differential, which can solve the problem that the oil suction port of the limited slip differential cannot suck oil and build up oil pressure, and cannot reach the required locking torque, thereby causing the wheel to continuously slip on one side, the friction plate is always in a friction state, and the friction plate is burned.

[0006] A second objective of the present disclosure is to provide a vehicle anti-skid system, wherein the limited slip differential in the vehicle anti-skid system uses the control method of the limited slip differential provided by the present disclosure.

[0007] A third object of the present disclosure is to provide a vehicle, which includes the vehicle anti-skid system provided by the present disclosure.

[0008] In order to achieve the above object, the present disclosure provides a control method for a limited slip differential, comprising:

[0009] obtaining at least one parameter indicating whether the limited slip differential is in a first state; and

[0010] The controller of the limited slip differential sends a signal to the instrument panel based on the at least one parameter and displays a prompt message; wherein,

[0011] In the first state, the limited slip differential cannot reach a predetermined locking torque;

[0012] The at least one parameter includes: a vehicle inclination angle α, a wheel speed difference ΔV=|V1-V2|, V1 is the left wheel speed, and V2 is the right wheel speed.

[0013] Optionally, the control method further includes:

[0014] When the driver continues to operate the vehicle after receiving the prompt information, the controller controls the limited slip differential to switch to the second state;

[0015] When the driver stops operating the vehicle after receiving the prompt information, the controller controls the limited slip differential to gradually switch to the second state or the third state;

[0016] In the second state, the limited slip differential is closed;

[0017] In the third state, the limited slip differential can be partially locked or fully locked.

[0018] Optionally, in the step of the controller controlling the limited slip differential to switch to the second state, the controller controls the solenoid valve of the limited slip differential to open until the oil pressure is zero.

[0019] Optionally, when the vehicle inclination angle α>a first preset threshold, the limited slip differential is in the first state, wherein the first preset threshold is 20°-30°.

[0020] Optionally, when the wheel speed difference ΔV>a second preset threshold value and the duration T>15 seconds, the limited slip differential is in the first state, wherein the second preset threshold value is 10 rpm-25 rpm.

[0021] Optionally, when the limited slip differential is not in the first state, the controller controls the limited slip differential to automatically switch between the second state and the third state, wherein:

[0022] In the second state, the limited slip differential is closed;

[0023] In the third state, the limited slip differential can be partially locked or fully locked.

[0024] Optionally, the prompt information at least includes "The limited slip differential cannot work properly, please do not continue to operate the vehicle."

[0025] According to a second aspect of the present disclosure, a vehicle anti-skid system is also provided, comprising a limited differential, a first detection element for detecting a vehicle inclination angle, a second detection element for detecting a left wheel rotation speed, and a third detection element for detecting a right wheel rotation speed, wherein the first detection element, the second detection element, the third detection element, and a dashboard of the vehicle are respectively connected to a controller of the limited differential, and the limited differential is controlled according to the method described above.

[0026] Optionally, the vehicle anti-skid system further comprises a traction control system, and the traction control system is used to enable the vehicle to get out of trouble when the vehicle is in an unlocked state.

[0027] According to a third aspect of the present disclosure, a vehicle is also provided, comprising the vehicle anti-skid system as described above.

[0028] Through the above technical solution, the driver is prompted through a prompt message that the limited slip differential cannot work normally, that is, the oil suction port of the limited slip differential cannot absorb oil and build up oil pressure, the oil pressure is insufficient, and the limited slip differential cannot reach the required locking torque, which causes the wheel to continue to slip on one side. If the vehicle continues to be operated for a long time, the adjacent friction plates will be in a friction state all the time, and friction plate burning will occur. The driver can stop the operation according to the prompt message to reduce the risk of limited slip differential friction plate burning and increase the service life of the limited slip differential.

[0029] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0031] Figure 1 is a flow chart of a control method of a limited slip differential provided by an exemplary embodiment of the present disclosure;

[0032] Figure 2 is a flowchart of a control method of a limited slip differential provided by another exemplary embodiment of the present disclosure;

[0033] Figure 3 is a control flow chart of a vehicle anti-skid system provided by another exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0035] In the present disclosure, unless otherwise stated, the directional words "left" and "right" used in the present disclosure refer to the left and right sides of the driver relative to the direction of travel of the vehicle. In addition, the terms "first", "second", etc. used in the present disclosure are to distinguish one element from another element and do not have order and importance. In the present disclosure, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0036] First of all, it should be clear that the limited slip differential has:

[0037] In the first state, the oil pressure is insufficient, the limited slip differential cannot reach the predetermined locking torque, and the adjacent friction plates are always in a friction state, resulting in friction plate burning; in the second state, the limited slip differential is closed, the oil pressure is zero, the multiple friction plates are spaced apart, and there is no problem of friction plate burning; and in the third state, the limited slip differential can be partially locked or fully locked. Under the action of oil pressure, the multiple friction plates are pressed tightly, and there is also no problem of friction plate burning.

[0038] Therefore, for the problem of friction plate ablation in the first state, refer to Figure 1 The present disclosure provides a control method for a limited slip differential, the control method for the limited slip differential comprising: step 101, obtaining at least one parameter indicating whether the limited slip differential is in a first state; and step 102, a controller of the limited slip differential sends a signal to a dashboard based on the at least one parameter and displays a prompt message; wherein, in the first state, the limited slip differential cannot reach a predetermined locking torque, and the at least one parameter comprises: a vehicle inclination angle α, a wheel speed difference ΔV=|V1-V2|, V1 is a left wheel speed, and V2 is a right wheel speed.

[0039] In the control method of the limited slip differential provided in the present disclosure, a prompt message is used to prompt the driver that the limited slip differential cannot work normally, that is, the oil suction port of the limited slip differential cannot absorb oil and build up oil pressure, the oil pressure is insufficient, and the limited slip differential cannot reach the required locking torque, thereby causing the wheel to continue to slip on one side. If the vehicle continues to be operated for a long time, the adjacent friction plates will be in a friction state all the time, and friction plate burning will occur. The driver can stop the operation according to the prompt message to reduce the risk of friction plate burning of the limited slip differential and increase the service life of the limited slip differential.

[0040] As an implementation method, refer to Figure 2In step 101, after obtaining at least one parameter, step 1011 is executed to determine whether the limited slip differential is in the first state. When the limited slip differential is in the first state, step 102 is executed, and the controller sends a signal to the dashboard and displays a prompt message. The control method of the limited slip differential provided by the present disclosure also includes: after the driver receives the corresponding prompt message, step 1021 is executed to determine whether the driver continues to operate the vehicle. When the driver continues to operate the vehicle, that is, the limited slip differential continues to work, and there is a wheel speed difference between the left and right wheels of the rear axle, at this time, step 103 is executed, and the controller The limited slip differential is controlled to switch to the second state, that is, the limited slip differential is closed, the oil pressure is no longer established, and the multiple friction plates are spaced apart to reduce the risk of ablation caused by friction plate sliding; when the driver stops operating the vehicle after receiving the prompt message, step 104 is executed, and the controller controls the limited slip differential to gradually switch to the second state or the third state. In the second state, the limited slip differential is closed, and in the third state, the limited slip differential can be partially locked or completely locked. At this time, the working state of the limited slip differential can be automatically controlled according to the road conditions, and automatically switched between the closed state and the locked state to meet driving needs.

[0041] According to some embodiments, reference Figure 2 In step 103, in which the controller controls the limited slip differential to switch to the second state, the controller can control the solenoid valve of the limited slip differential to open until the oil pressure is zero. By opening the solenoid valve, the oil pressure is no longer established, which can reduce the risk of ablation caused by friction plate sliding. The control method is effective and the operation is simple and convenient.

[0042] Specifically, when the vehicle inclination angle α> the first preset threshold, the limited slip differential is in the above-mentioned first state, wherein the first preset threshold may be 20°-30°, and preferably, the first preset threshold may be 26°. When the vehicle inclination angle α is greater than the first preset threshold by monitoring, the limited slip differential cannot absorb oil and build up oil pressure, and at this time, the limited slip differential is in a state where it cannot work normally. It should be noted that the first preset threshold can be adjusted according to the different limited slip differential structures in different vehicle models, and the specific value is not specifically limited here, and can be calculated according to actual conditions.

[0043] Furthermore, when the wheel speed difference ΔV> the second preset threshold value, and the duration T> 15 seconds, the second preset threshold value may be 10rpm-25rpm, and at this time, it also indicates that the limited slip differential is in a state where it cannot work normally, that is, it is in the first state. Specifically, the second preset threshold value and the duration T are not specifically limited here, and may have different value ranges according to different vehicle models and structures of the limited slip differential, and are not specifically limited here.

[0044] As an example, refer to Figure 2When the limited slip differential is not in the first state, it proves that the limited slip differential can work normally and the friction plate will not be burned. The driver can control the limited slip differential to automatically switch between the second state (closed state) and the third state (partially locked or fully locked state) through the controller according to the road conditions.

[0045] Specifically, the prompt information at least includes "The limited slip differential cannot work properly, please do not continue to operate the vehicle". The content of the prompt information is not limited to the above embodiments, and it only needs to serve to remind the customer to avoid damaging the limited slip differential, and all of them fall within the protection scope of the present disclosure.

[0046] According to a second aspect of the present disclosure, a vehicle anti-skid system is also provided, the vehicle anti-skid system comprising a limited slip differential, a first detection element for detecting a vehicle inclination angle, a second detection element for detecting a left wheel rotation speed, and a third detection element for detecting a right wheel rotation speed, wherein the first detection element, the second detection element, the third detection element, and a dashboard of the vehicle are respectively connected to a controller of the limited slip differential, and the controller can further control the limited slip differential according to the control method of the limited slip differential described above based on parameters provided by the first detection element or the second detection element and the third detection element, that is, judging whether the limited slip differential is in a first state based on the acquired parameters, and when the limited slip differential is in a first state, the controller can further control the limited slip differential according to the control method of the limited slip differential described above. In the first state, the controller sends a signal to the dashboard and displays a prompt message. When the driver receives the corresponding prompt message, it determines whether the driver continues to operate the vehicle. When the driver continues to operate the vehicle, the controller controls the limited slip differential to switch to the second state, that is, close the limited slip differential; when the driver stops operating the vehicle after receiving the prompt message, the controller controls the limited slip differential to gradually switch to the second state or the third state. At this time, the working state of the limited slip differential can be controlled according to the road conditions, and automatically switch between the closed state and the locked state. The vehicle anti-skid system has the same advantages as the control method of the limited slip differential described above compared with the prior art, which will not be repeated here. The first detection element can be an inclination sensor, the second detection element and the third detection element can be speed sensors respectively. In other embodiments, any device that can be used to obtain the inclination angle and speed can also fall within the protection scope of the present disclosure.

[0047] As an implementation method, refer to Figure 3The vehicle anti-skid system also includes a traction control system (Traction Control System, TCS). After executing step 103, that is, after closing the limited slip differential, step 104 is executed to cooperate with the traction control system to get the vehicle out of trouble. Since the oil pressure of the limited slip differential is zero in the closed state, the traction control system in the electronic stability program (ESP) can help the vehicle get out of trouble, so that the wheels can get out of the slipping state and the vehicle can continue to drive normally.

[0048] According to the third aspect of the present disclosure, a vehicle is also provided, which includes the vehicle anti-skid system provided by the present disclosure. The vehicle has the same advantages as the control method of the limited slip differential and the vehicle anti-skid system introduced above compared with the prior art, which will not be repeated here.

[0049] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0050] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0051] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A control method for a limited slip differential, characterized in that: include: obtaining at least one parameter indicating whether the limited slip differential is in a first state; as well as The controller of the limited slip differential sends a signal to the instrument panel based on the at least one parameter and displays a prompt message; wherein, In the first state, the limited slip differential cannot reach a predetermined locking torque; The at least one parameter includes: a vehicle inclination angle α.

2. The control method of the limited slip differential according to claim 1, characterized in that: The control method further comprises: When the driver continues to operate the vehicle after receiving the prompt information, the controller controls the limited slip differential to switch to the second state; When the driver stops operating the vehicle after receiving the prompt information, the controller controls the limited slip differential to gradually switch to the second state or the third state; In the second state, the limited slip differential is closed; In the third state, the limited slip differential can be partially locked or fully locked.

3. The control method of the limited slip differential according to claim 2, characterized in that: In the step of the controller controlling the limited slip differential to switch to the second state, the controller controls the solenoid valve of the limited slip differential to open until the oil pressure is zero.

4. The control method of the limited slip differential according to claim 1, characterized in that: When the vehicle inclination angle α>a first preset threshold, the limited slip differential is in the first state, wherein the first preset threshold is 20°-30°.

5. The control method of the limited slip differential according to claim 1, characterized in that: When the limited slip differential is not in the first state, the controller controls the limited slip differential to automatically switch between the second state and the third state; wherein, In the second state, the limited slip differential is closed; In the third state, the limited slip differential can be partially locked or fully locked.

6. The control method of the limited slip differential according to claim 1, characterized in that: The prompt message at least includes "The limited slip differential cannot work properly, please do not continue to operate the vehicle." 7. A vehicle anti-skid system, characterized in that: It includes a limited differential, a first detection element for detecting a vehicle inclination angle, a second detection element for detecting a left wheel rotation speed, and a third detection element for detecting a right wheel rotation speed, wherein the first detection element, the second detection element, the third detection element, and a dashboard of the vehicle are respectively connected to a controller of the limited differential, and the limited differential is controlled according to the method described in any one of claims 1 to 6.

8. The vehicle anti-skid system according to claim 7, characterized in that: The vehicle anti-skid system further comprises a traction control system, and the traction control system is used to enable the vehicle to escape from trouble when the vehicle is in an unlocked state.

9. A vehicle, characterized in that: Comprising a vehicle anti-skid system according to claim 7 or 8.

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