Vehicle reversing system control method, vehicle reversing system and vehicle

Abstract

The application belongs to the technical field of vehicle control, and discloses a vehicle reversing system control method, a vehicle reversing system and a vehicle. The vehicle reversing system control method fills the forward oil cylinder and the backward oil cylinder with oil after starting the gearbox, so that the two are in a standby state, thereby improving the speed and sensitivity of the subsequent reversing response, shortening the time consumed in the reversing process, and further improving the fluency of vehicle reversing. Whether the vehicle speed reaches a first set rotating speed value n1 during vehicle travel is judged to determine the timing of oil discharge of the forward oil cylinder or the backward oil cylinder, thereby protecting the vehicle reversing system and prolonging its service life.

Description

Technical Field

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

[0002] When designing a gearbox, placing the reversing clutch on the output shaft is inconvenient due to the excessive size of the friction clutch. Therefore, in the aforementioned scenario, a dog clutch with strong torque transmission capability and small size can be used to achieve the reversing function.

[0003] A jaw clutch transmits torque through the engagement of two toothed sections. One of these sections is controlled by a hydraulic system; the hydraulic cylinder is filled with oil to increase pressure, causing one of the jaw clutch's toothed sections to move and engage with the other. If the hydraulic cylinder is only filled with oil after a reversing request is received while the vehicle is moving in one direction, the reversing process will be too time-consuming and lack sensitivity, hindering the smoothness of vehicle reversing. Furthermore, if the hydraulic cylinder corresponding to the other jaw clutch, used to reverse wheel rotation, always retains hydraulic oil while the vehicle is moving in one direction, the solenoid valve in the hydraulic system used for filling and draining the hydraulic cylinder will operate for an extended period, reducing its lifespan.

[0004] Therefore, there is an urgent need for a vehicle steering system control method, a vehicle steering system, and a vehicle to solve the above problems. Summary of the Invention

[0005] According to one aspect of the present invention, the object is to provide a vehicle steering system control method that can shorten the time consumed in the steering process, improve the steering sensitivity, and thus improve the smoothness of vehicle steering.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A vehicle reversing system control method, wherein the vehicle reversing system includes a gearbox, the gearbox including a housing, an output shaft, a forward clutch, a reverse clutch, a forward cylinder, and a reverse cylinder, wherein the forward clutch, the reverse clutch, the forward cylinder, and the reverse cylinder are all disposed within the housing, the output shaft extends out of the housing and is configured to connect to a wheel; the forward cylinder is used to drive the forward clutch to engage so that the output shaft can rotate forward, and the reverse cylinder is used to drive the reverse clutch to engage so that the output shaft can rotate in reverse;

[0008] The vehicle reversing system control method includes:

[0009] S100, start the gearbox;

[0010] S110, oil is filled into the forward oil cylinder and the backward oil cylinder, so that the forward oil cylinder and the backward oil cylinder are both in a standby state, at this time, the output pressure of the forward oil cylinder is a forward standby pressure pf1, and the output pressure of the backward oil cylinder is a backward standby pressure p r1 ;

[0011] S200, a driving direction instruction is acquired, if the driving direction instruction is forward, S300 is performed; if the driving direction instruction is backward, S400 is performed;

[0012] S300, oil continues to be filled into the forward oil cylinder, the output pressure of the forward oil cylinder is increased to a forward pressure p f2 , and the output pressure of the forward oil cylinder is kept at the forward pressure p f2 , when the output shaft speed value n out is increased to a first set speed value n1, oil is discharged from the backward oil cylinder, and the output pressure of the backward oil cylinder is reduced to zero;

[0013] S400, oil continues to be filled into the backward oil cylinder, the output pressure of the backward oil cylinder is increased to a backward pressure p r2 , and the output pressure of the backward oil cylinder is kept at the backward pressure p r2 , when the output shaft speed value n out is increased to the first set speed value n1, oil is discharged from the forward oil cylinder, and the output pressure of the forward oil cylinder is reduced to zero.

[0014] As a preferred scheme of the vehicle reversing system control method provided by the application, when the output shaft speed value n out is reduced to less than the first set speed value n1, but the driving direction instruction does not change, the backward oil cylinder is filled with oil, so that the backward oil cylinder is in the standby state;

[0015] When the output shaft speed value n out is reduced to less than the first set speed value n1, and the driving direction instruction changes to backward, the backward oil cylinder is filled with oil, so that the backward oil cylinder is in the standby state, and the forward oil cylinder is discharged, so that the forward oil cylinder is in the standby state.

[0016] As a preferred scheme of the vehicle reversing system control method provided by the application, when the output shaft speed value n out is reduced to less than the first set speed value n1, and the driving direction instruction changes to backward, and the output shaft speed value n out is reduced to a second set speed value n2, the backward oil cylinder is filled with oil, so that the backward oil cylinder is in the standby state, the forward oil cylinder is discharged, so that the forward oil cylinder is in the standby state, and the second set speed value n2 is less than the first set speed value n1.

[0017] As a preferred solution of the vehicle reversing system control method provided by the present application, during the vehicle reversing process, when the output shaft speed value n out decreases to be less than the first set speed value n1, but the driving direction instruction does not change, the forward oil cylinder is filled with oil, so that the forward oil cylinder is in the standby state;

[0018] As a preferred solution of the vehicle reversing system control method provided by the present application, during the vehicle reversing process, when the output shaft speed value n out decreases to be less than the first set speed value n1, and the driving direction instruction changes to forward, the forward oil cylinder is filled with oil, so that the reverse oil cylinder is in the standby state, and the reverse oil cylinder is drained, so that the forward oil cylinder is in the standby state.

[0019] As a preferred solution of the vehicle reversing system control method provided by the present application, during the vehicle reversing process, when the output shaft speed value n out decreases to be less than the first set speed value n1, and the driving direction instruction changes to forward, and when the output shaft speed value n out decreases to be less than the second set speed value n2, the forward oil cylinder is filled with oil, so that the forward oil cylinder is in the standby state, and the reverse oil cylinder is drained, so that the reverse oil cylinder is in the standby state, the second set speed value n2 is less than the first set speed value n1.

[0020] As a preferred solution of the vehicle reversing system control method provided by the present application, in step S110, before the pressure in the forward oil cylinder reaches the forward standby pressure p f1 , and the pressure in the reverse oil cylinder reaches the reverse standby pressure p r1 , the oil filling process of the forward oil cylinder and the oil filling process of the reverse oil cylinder are performed simultaneously.

[0021] According to still another aspect of the present application, the purpose is to provide a vehicle reversing system, which adopts the vehicle reversing system control method according to any one of the above solutions, comprising:

[0022] The output shaft, the forward clutch, the reverse clutch, the forward oil cylinder, the reverse oil cylinder, the forward input shaft, the reverse input shaft and the gearbox, the output shaft is connected to the gearbox;

[0023] The forward clutch comprises a first forward half clutch and a second forward half clutch which are separably connected, the first forward half clutch is connected to the output shaft, the second forward half clutch is connected to the forward input shaft, and the output end of the forward oil cylinder is connected to the first forward half clutch or the second forward half clutch;

[0024] The rearward clutch comprises a first rearward half clutch and a second rearward half clutch connected in a separable manner, the first rearward half clutch is connected to the output shaft, the second rearward half clutch is connected to the rearward input shaft, and the output end of the rearward oil cylinder is connected to the first rearward half clutch or the second rearward half clutch.

[0025] As a preferred scheme of the vehicle reversing system provided by the present application, the vehicle reversing system further comprises a hydraulic oil tank and a hydraulic pump;

[0026] The hydraulic pump is in communication with the hydraulic oil tank and selectively in communication with the oil inlet of the forward oil cylinder and the oil inlet of the rearward oil cylinder, and the hydraulic pump can pump the hydraulic oil in the hydraulic oil tank to the forward oil cylinder or the rearward oil cylinder to charge and actuate the forward oil cylinder to drive the first forward half clutch to combine with the second forward half clutch, or to charge and actuate the rearward oil cylinder to drive the first rearward half clutch to combine with the second rearward half clutch.

[0027] The oil outlet of the forward oil cylinder and the oil outlet of the rearward oil cylinder are selectively in communication with the hydraulic oil tank, and the hydraulic oil in the forward oil cylinder or the rearward oil cylinder can be discharged to the hydraulic oil tank to actuate the forward oil cylinder to drive the first forward half clutch to separate from the second forward half clutch, or to actuate the rearward oil cylinder to drive the first rearward half clutch to separate from the second rearward half clutch.

[0028] As a preferred scheme of the vehicle reversing system provided by the present application, the vehicle reversing system further comprises a forward control valve and a rearward control valve, the forward control valve and the rearward control valve are connected to the hydraulic pump respectively, the forward control valve is connected to the forward oil cylinder, and the rearward control valve is connected to the rearward oil cylinder, the forward oil cylinder can be charged or discharged through the forward control valve, and the rearward oil cylinder can be charged or discharged through the rearward control valve.

[0029] As a preferred scheme of the vehicle reversing system provided by the present application, the vehicle reversing system further comprises an oil suction filter and an oil pressure filter, the oil suction filter is arranged between the oil inlet of the hydraulic pump and the hydraulic oil tank, and the oil pressure filter is arranged downstream of the outlet of the hydraulic pump.

[0030] According to another aspect of the present application, the purpose is to provide a vehicle comprising a vehicle reversing system according to any one of the above schemes and a wheel connected to the output shaft.

[0031] The present application has the following beneficial effects:

[0032] The vehicle reversing system control method provided by the application can improve the speed and sensitivity of the subsequent reversing response, shorten the time consumed by the reversing process, and improve the smoothness of the vehicle reversing.

[0033] The vehicle reversing system provided by the application can effectively improve the sensitivity of the reversing process based on the vehicle reversing system control method.

[0034] The vehicle provided by the application is provided with the vehicle reversing system, and thus the smoothness and the fluency of the vehicle reversing can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic diagram of the vehicle reversing system provided by the first embodiment of the application;

[0036] Figure 2 is a flowchart of the vehicle reversing system control method provided by the second embodiment of the application.

[0037] In the drawings:

[0038] 10, hydraulic oil tank; 20, forward oil cylinder; 21, first reset spring; 30, backward oil cylinder; 31, second reset spring; 40, hydraulic pump; 50, forward control valve; 60, backward control valve; 70, oil suction filter; 71, first safety valve; 80, oil pressure filter; 81, second safety valve; 90, overflow valve. DETAILED DESCRIPTION

[0039] The application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the application, and not to limit the application. In addition, it should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings, not all the structures.

[0040] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature is "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0042] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like, orientation or positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0043] Embodiment one

[0044] The present embodiment provides a vehicle reversing system and a vehicle. The vehicle comprises a vehicle wheel and the vehicle reversing system provided by the present embodiment, which can control the forward and reverse movement of the vehicle.

[0045] Figure 1 A schematic diagram of the vehicle reversing system provided by the first embodiment of the present application is shown. Referring to Figure 1 The vehicle reversing system provided by the present embodiment comprises a gearbox, which comprises a gearbox body, an output shaft, a forward clutch, a reverse clutch, a forward oil cylinder 20 and a reverse oil cylinder 30, the forward clutch, the reverse clutch, the forward oil cylinder 20 and the reverse oil cylinder 30 are all arranged in the gearbox body, and the output shaft extends out of the gearbox body and is configured to be connected to a vehicle wheel. The forward oil cylinder 20 is used to drive the forward clutch to engage so that the output shaft can rotate forward, and the reverse oil cylinder 30 is used to drive the reverse clutch to engage so that the output shaft can rotate reversely. In the present embodiment, the forward clutch and the reverse clutch are both jaw clutches.

[0046] Specifically, the forward clutch includes a first forward half clutch and a second forward half clutch connected in a separable manner. The first forward half clutch is connected to the output shaft, and the second forward half clutch is connected to the forward input shaft. The output end of the forward cylinder 20 is connected to either the first forward half clutch or the second forward half clutch. In the present embodiment, the forward cylinder 20 is connected to the second forward half clutch. When the forward cylinder 20 is actuated to control the first forward half clutch and the second forward half clutch to be coupled to each other, the forward input shaft is drivingly connected to the output shaft, and the vehicle is able to move forward.

[0047] Similarly, the reverse clutch includes a first reverse half clutch and a second reverse half clutch connected in a separable manner. The first reverse half clutch is connected to the output shaft, and the second reverse half clutch is connected to the reverse input shaft. The output end of the reverse cylinder 30 is connected to either the first reverse half clutch or the second reverse half clutch. In the present embodiment, the reverse cylinder 30 is connected to the second reverse half clutch. When the reverse cylinder 30 is actuated to control the first reverse half clutch and the second reverse half clutch to be coupled to each other, the reverse input shaft is drivingly connected to the output shaft, and the vehicle is able to move backward.

[0048] Specifically, the vehicle reversing system further includes a hydraulic oil tank 10 and a hydraulic pump 40. The hydraulic pump 40 is in communication with the hydraulic oil tank 10 and selectively in communication with the oil inlet of the forward cylinder 20 and the oil inlet of the reverse cylinder 30. During the reversing from reverse to forward, the hydraulic pump 40 is able to pump the hydraulic oil in the hydraulic oil tank 10 to the forward cylinder 20 to charge the forward cylinder 20 and actuate it to drive the first forward half clutch and the second forward half clutch to be coupled to each other. During the reversing from forward to reverse, the hydraulic pump 40 is able to pump the hydraulic oil in the hydraulic oil tank 10 to the reverse cylinder 30 to charge the reverse cylinder 30 and actuate it to drive the first reverse half clutch and the second reverse half clutch to be coupled to each other.

[0049] Specifically, the oil outlet of the forward cylinder 20 and the oil outlet of the reverse cylinder 30 are selectively in communication with the hydraulic oil tank 10, respectively. During the reversing from forward to reverse, the hydraulic oil in the forward cylinder 20 is able to be discharged to the hydraulic oil tank 10 to actuate the forward cylinder 20 to drive the first forward half clutch and the second forward half clutch to be decoupled. During the reversing from reverse to forward, the hydraulic oil in the reverse cylinder 30 is able to be discharged to the hydraulic oil tank 10 to actuate the reverse cylinder 30 to drive the first reverse half clutch and the second reverse half clutch to be decoupled.

[0050] More specifically, the hydraulic pump 40 is also capable of pumping hydraulic oil into the forward oil cylinder 20, so that the piston rod in the forward oil cylinder 20 is just capable of overcoming the elastic force of the first return spring 21 in its rod cavity under the pressure in the rodless cavity, and the moving degree of the piston rod is not enough to make the first forward half clutch and the second forward half clutch combine. At this time, the forward clutch is in the standby state.

[0051] Similarly, the hydraulic pump 40 is also capable of pumping hydraulic oil into the backward oil cylinder 30, so that the piston rod in the backward oil cylinder 30 is just capable of overcoming the elastic force of the second return spring 31 in its rod cavity under the pressure in the rodless cavity, and the moving degree of the piston rod is not enough to make the first backward half clutch and the second backward half clutch combine. At this time, the backward clutch is in the standby state.

[0052] Continuing to refer to Figure 1 The vehicle reversing system further comprises a forward control valve 50 and a backward control valve 60. The forward control valve 50 and the backward control valve 60 are connected in parallel to the hydraulic pump 40, the forward control valve 50 is connected to the forward oil cylinder 20, and the backward control valve 60 is connected to the backward oil cylinder 30. The forward oil cylinder 20 can be filled with oil or drained through the forward control valve 50, and the backward oil cylinder 30 can be filled with oil or drained through the backward control valve 60. It should be noted that the oil inlet and outlet of the forward oil cylinder 20 are integrated in the rod cavity of the forward oil cylinder 20, the hydraulic pump 40 can pump hydraulic oil into the rod cavity of the forward oil cylinder 20 through the forward control valve 50, and the forward control valve 50 can also drain the hydraulic oil in the rod cavity of the forward oil cylinder 20 to the hydraulic oil tank 10, so that the piston rod in the forward oil cylinder 20 moves under the action of the first return spring 21, thereby driving the first forward half clutch and the second forward half clutch to separate, and stopping the forward movement of the vehicle. Similarly, the oil inlet and outlet of the backward oil cylinder 30 are integrated in the rod cavity of the backward oil cylinder 30, the hydraulic pump 40 can pump hydraulic oil into the rod cavity of the backward oil cylinder 30 through the backward control valve 60, and the backward control valve 60 can also drain the hydraulic oil in the rod cavity of the backward oil cylinder 30 to the hydraulic oil tank 10, so that the piston rod in the backward oil cylinder 30 moves under the action of the second return spring 31, thereby driving the first backward half clutch and the second backward half clutch to separate, and stopping the backward movement of the vehicle. In this embodiment, the forward control valve 50 and the backward control valve 60 can be solenoid valves.

[0053] Specifically, the vehicle reversing system further comprises an oil suction filter 70 and an oil pressure filter 80. The oil suction filter 70 is arranged between the oil inlet of the hydraulic pump 40 and the hydraulic oil tank 10, and the oil pressure filter 80 is arranged downstream of the outlet of the hydraulic pump 40 and upstream of the forward control valve 50 and the backward control valve 60. Through the oil suction filter 70, the hydraulic oil coming from the hydraulic oil tank 10 and about to enter the hydraulic pump 40 can be filtered, so as to prevent impurities in the hydraulic oil from blocking the hydraulic pump 40. Similarly, through the oil pressure filter 80, the hydraulic oil coming from the hydraulic pump 40 and about to enter the forward control valve 50 or the backward control valve 60 can be filtered, so as to prevent impurities in the hydraulic oil from entering the forward control valve 50 or the backward control valve 60.

[0054] More specifically, a first safety valve 71 is arranged in parallel with the oil suction filter 70 between the hydraulic pump 40 and the hydraulic oil tank 10. The first safety valve 71 can provide a flow passage for the hydraulic oil when the filter element of the oil suction filter 70 is accidentally blocked. Similarly, a second safety valve 81 is arranged in parallel with the oil pressure filter 80 between the hydraulic pump 40 and the forward control valve 50 and the backward control valve 60. The second safety valve 81 can provide a flow passage for the hydraulic oil when the filter element of the oil pressure filter 80 is accidentally blocked.

[0055] More specifically, a first safety valve 71 is arranged in parallel with the oil suction filter 70 between the hydraulic pump 40 and the hydraulic oil tank 10. The first safety valve 71 can provide a flow passage for the hydraulic oil when the filter element of the oil suction filter 70 is accidentally blocked. Similarly, a second safety valve 81 is arranged in parallel with the oil pressure filter 80 between the hydraulic pump 40 and the forward control valve 50 and the backward control valve 60. The second safety valve 81 can provide a flow passage for the hydraulic oil when the filter element of the oil pressure filter 80 is accidentally blocked.

[0056] Embodiment Two

[0057] Figure 2 A flow chart of the vehicle reversing system control method provided by the second embodiment of the present application is shown. Referring to Figure 1 and Figure 2 The second embodiment provides a vehicle reversing system control method. The vehicle reversing system provided by the first embodiment is reversed based on the vehicle reversing system control method provided by the second embodiment. It should be noted that each speed value and each pressure value shown in the second embodiment are absolute values.

[0058] The vehicle reversing system control method provided by the second embodiment comprises:

[0059] Step S100, the gearbox is powered on, and the gearbox is started. At this time, the output shaft speed value n out is zero.

[0060] Then, step S110 is performed, the forward oil cylinder 20 and the backward oil cylinder 30 are filled with oil, and the forward oil cylinder 20 and the backward oil cylinder 30 are both in a standby state. At this time, the output pressure of the forward oil cylinder 20 is the forward standby pressure p f1, the output pressure of the backward cylinder 30 is the backward preparation pressure p r1 .

[0061] Specifically, in the present embodiment, the hydraulic oil amount filled in the rodless cavity of the forward cylinder 20 is controlled by the forward control valve 50, so that the pressure in the rodless cavity of the forward cylinder 20 reaches the forward preparation pressure p f1 . The size of the forward preparation pressure p f1 is such that the piston rod of the forward cylinder 20 can just overcome the elastic force of the first return spring 21 in its rod cavity under the pressure of the hydraulic oil in its rodless cavity, and the moving degree of the piston rod at this time cannot make the first forward half clutch and the second forward half clutch combine.

[0062] Similarly, the hydraulic oil amount filled in the rodless cavity of the backward cylinder 30 is controlled by the backward control valve 60, so that the pressure in the rodless cavity of the backward cylinder 30 reaches the backward preparation pressure p r1 . The size of the backward preparation pressure p r1 is such that the piston rod of the backward cylinder 30 can just overcome the elastic force of the second return spring 31 in its rod cavity under the pressure of the hydraulic oil in its rodless cavity, and the moving degree of the piston rod at this time cannot make the first backward half clutch and the second backward half clutch combine. Through the above setting, the forward cylinder 20 and the backward cylinder 30 can be in a preparation state before formal shifting, which facilitates the quick response of subsequent shifting.

[0063] It should be noted that the size of the forward preparation pressure p f1 and the size of the backward preparation pressure p r1 are calculated according to the physical properties of the first return spring 21 and the second return spring 31 respectively, and the calculation process is prior art, which will not be described here in the present embodiment.

[0064] Specifically, in step S110, before the output pressure of the forward cylinder 20 reaches the forward preparation pressure p f1 and the output pressure of the backward cylinder 30 reaches the backward preparation pressure p r1 , the oil filling process of the forward cylinder 20 and the oil filling process of the backward cylinder 30 are carried out at the same time. Thus, the subsequent forward cylinder 20 or backward cylinder 30 can be quickly responded.

[0065] Step S200, obtain the driving direction instruction, if the driving direction instruction is forward, proceed to S300; if the driving direction instruction is backward, proceed to S400.

[0066] Step S300, continue to fill oil into the forward cylinder 20, and raise the output pressure of the forward cylinder 20 to the forward pressure p f2and keep the output pressure of the forward oil cylinder 20 at the forward pressure p f2 , the output shaft speed value n out is raised to the first set speed value n1, and the output pressure of the forward oil cylinder 20 is kept at the forward pressure p f2 , and the backward oil cylinder 30 is bled to reduce the output pressure of the backward oil cylinder 30 to zero. The forward pressure p f2 is sized to be able to overcome the elastic force of the first return spring 21 and move the piston rod of the forward oil cylinder 20 to combine the first forward half clutch and the second forward half clutch and be able to transmit the required torque without disengaging. Since the vehicle speed is gradually increasing at this time, it can be judged that the vehicle will not suddenly reverse at this time, so the heating problem caused by the backward control valve 60 continuously charging the backward oil cylinder 30 can be avoided, which affects the service life of the backward control valve 60.

[0067] It should be noted that the specific value of the first set speed value n1 should be determined according to the actual performance of the vehicle, and the first set speed value n1 should be less than the minimum value of the normal vehicle speed to prevent pressure shock in the forward oil cylinder 20. If the minimum value of the normal vehicle speed is 5 km / h, the first set speed value n1 can be set to 2 km / h.

[0068] More specifically, during vehicle forward travel, the following is performed:

[0069] Step S310, when the output shaft speed value n out is reduced to less than the first set speed value n1, but the driving direction instruction does not change, the backward oil cylinder 30 is charged to raise the pressure to the backward preparation pressure p r1 . At this time, since the output shaft speed value n out is reduced to a small amount (the first set speed value n1), it is likely that the driver will perform a reversing operation at this time, so the backward oil cylinder 30 is pre-charged to place it in a prepared state to improve the response speed during subsequent reversing. When the output shaft speed value n out is reduced to less than the first set speed value n1, and the driving direction instruction changes to reverse, the backward oil cylinder 30 is charged to raise the pressure to the backward preparation pressure p r1 , which can place the backward oil cylinder 30 in a prepared state to improve the response speed during subsequent reversing. At the same time, the forward oil cylinder 20 is bled to reduce the pressure to the forward preparation pressure p f1 , which can place the forward oil cylinder 20 in a prepared state to prepare for subsequent operations in advance.

[0070] More specifically, during vehicle forward travel, when the output shaft speed value n out is reduced to less than the first set speed value n1, and the driving direction instruction changes to reverse, and the output shaft speed value nout When the output shaft speed value n decreases to the second set speed value n2, the reverse oil cylinder 30 is charged to the pressure to increase to the reverse preparation pressure p r1 , and the forward oil cylinder 20 is discharged to the pressure to decrease to the forward preparation pressure p f1 .

[0071] It should be noted that the second set speed value n2 is less than the first set speed value n1, and the second set speed value n2 is close to zero. If the output shaft speed value n out decreases to the second set speed value n2, it indicates that the vehicle is about to stop moving forward, and the vehicle still maintains a certain speed at this time. At this time, the reverse oil cylinder 30 is charged, and the forward oil cylinder 20 is discharged, which can prevent the vehicle from idling and sliding, and improve safety.

[0072] Step S400, continue to charge the reverse oil cylinder 30, and increase the output pressure of the reverse oil cylinder 30 to the reverse pressure p r2 When the output shaft speed value n out increases to the first set speed value n1, the output pressure of the reverse oil cylinder 30 is maintained at the reverse pressure p r2 , and the forward oil cylinder 20 is discharged to reduce the output pressure of the forward oil cylinder 20 to zero. The size of the reverse pressure p r2 is determined according to the elastic force of the second return spring 31, so that the piston rod of the reverse oil cylinder 30 moves to drive the first reverse half clutch and the second reverse half clutch to be combined, and the required torque can be transmitted without being disconnected.

[0073] Specifically, during the vehicle reverse process, the following is performed:

[0074] Step S410, when the output shaft speed value n out decreases to less than the first set speed value n1, but the driving direction instruction does not change, the forward oil cylinder 20 is charged to the pressure to increase to the forward preparation pressure p f1 . At this time, since the output shaft speed value n out decreases to a small amount (the first set speed value n1), it indicates that the driver is likely to perform a reversing operation at this time. At this time, the forward oil cylinder 20 is pre-charged to be in a preparation state, which can improve the response speed during subsequent reversing. When the output shaft speed value n out decreases to less than the first set speed value n1, and the driving direction instruction changes to forward, the forward oil cylinder 20 is charged to the pressure to increase to the forward preparation pressure p f1 , so that the forward oil cylinder 20 is in a preparation state, which can improve the response speed during subsequent reversing. At the same time, the reverse oil cylinder 30 is discharged to the pressure to decrease to the reverse preparation pressure p r1 at this time, which can make the reverse oil cylinder 30 in a preparation state to prepare for subsequent operation in advance.

[0075] Specifically, during the vehicle reversing process, when the output shaft speed value n out decreases to less than the first set speed value n1, and the driving direction instruction changes to forward, and when the output shaft speed value n out decreases to the second set speed value n2, the forward oil cylinder 20 is filled with oil to increase the pressure to the forward preparation pressure p f1 , and the reverse oil cylinder 30 is discharged to decrease the pressure to the reverse preparation pressure p r1 .

[0076] It should be noted that, since the forward clutch and the reverse clutch provided by the embodiment are both cogged clutches, when the first forward half clutch side and the second forward half clutch side are combined, the speed difference of the two parts needs to be as low as possible; when the first reverse half clutch side and the second reverse half clutch side are combined, the speed difference of the two parts also needs to be as low as possible. The controller in the vehicle reversing system can adjust the speed of the forward input shaft and the reverse input shaft according to the speed of the output shaft, so as to reduce the speed difference of the first forward half clutch side and the second forward half clutch side as much as possible, or reduce the speed difference of the first reverse half clutch side and the second reverse half clutch side as much as possible, to avoid the tooth clashing phenomenon when the first forward half clutch and the second forward half clutch are combined, or when the first reverse half clutch and the second reverse half clutch are combined.

[0077] Obviously, the above embodiments of the present application are merely exemplary and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. It is not necessary or possible to exhaust all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A vehicle reversing system control method, characterized in that, The vehicle reversing system includes a gearbox, which includes a housing, an output shaft, a forward clutch, a reverse clutch, a forward cylinder (20), and a reverse cylinder (30). The forward clutch, the reverse clutch, the forward cylinder (20), and the reverse cylinder (30) are all disposed within the housing. The output shaft extends out of the housing and is configured to connect to a wheel. The forward cylinder (20) is used to drive the forward clutch to engage so that the output shaft can rotate forward, and the reverse cylinder (30) is used to drive the reverse clutch to engage so that the output shaft can rotate in reverse. The vehicle reversing system control method includes: S100, start the gearbox; S110. Fill the forward cylinder (20) and the reverse cylinder (30) with oil, so that both the forward cylinder (20) and the reverse cylinder (30) are in a ready state. At this time, the output pressure of the forward cylinder (20) is the forward preparation pressure p. f1 The output pressure of the retracting cylinder (30) is the retracting preparation pressure p. r1 ; S200: Obtain the driving direction command. If the driving direction command is forward, proceed to S300; if the driving direction command is backward, proceed to S400. S300, Continue to fill the forward cylinder (20) with oil, and increase the output pressure of the forward cylinder (20) to the forward pressure p. f2 And maintain the output pressure of the forward cylinder (20) at the forward pressure p f2 When the output shaft speed value n out When the speed is increased to the first set speed value n1, the oil in the retraction cylinder (30) is drained to reduce the output pressure of the retraction cylinder (30) to zero; S400, Continue to fill the retracting cylinder (30) with oil, and increase the output pressure of the retracting cylinder (30) to the retracting pressure p. r2 And maintain the output pressure of the retracting cylinder (30) at the retracting pressure p r2 When the output shaft speed value n out When the speed is increased to the first set speed value n1, the oil in the forward cylinder (20) is drained to reduce the output pressure of the forward cylinder (20) to zero.

2. The vehicle reversing system control method according to claim 1, characterized in that, During the vehicle's forward movement, when the output shaft speed value n out When the speed is reduced to less than the first set speed value n1, but the driving direction command is not changed, the reversing cylinder (30) is filled with oil, so that the reversing cylinder (30) is in the preparatory state; When the output shaft speed value n out When the speed is reduced to less than the first set speed value n1 and the driving direction command changes to reverse, the reverse cylinder (30) is filled with oil, so that the reverse cylinder (30) is in the preparatory state, and the forward cylinder (20) is drained with oil, so that the forward cylinder (20) is in the preparatory state.

3. The vehicle reversing system control method according to claim 1, characterized in that, During the vehicle's forward movement, when the output shaft speed value n out The speed is reduced to less than the first set speed value n1, and the driving direction command changes to reverse, and the output shaft speed value n out When the speed is reduced to the second set speed value n2, the retracting cylinder (30) is filled with oil, so that the retracting cylinder (30) is in the preparatory state, and the forward cylinder (20) is drained with oil, so that the forward cylinder (20) is in the preparatory state. The second set speed value n2 is less than the first set speed value n1.

4. The vehicle reversing system control method according to claim 1, characterized in that, During the vehicle's reversing process, when the output shaft speed value n out When the speed is reduced to less than the first set speed value n1, but the driving direction command is not changed, the forward cylinder (20) is filled with oil, so that the forward cylinder (20) is in the preparatory state; When the output shaft speed value n out When the speed is reduced to less than the first set speed value n1 and the driving direction command changes to forward, the forward cylinder (20) is filled with oil, so that the reverse cylinder (30) is in the preparatory state, and the reverse cylinder (30) is drained of oil, so that the forward cylinder (20) is in the preparatory state.

5. The vehicle reversing system control method according to claim 1, characterized in that, During the vehicle's reversing process, when the output shaft speed value n out The speed is reduced to less than the first set speed value n1, and the driving direction command changes to forward, and the output shaft speed value n out When the speed is reduced to the second set speed value n2, the forward cylinder (20) is filled with oil, so that the forward cylinder (20) is in the preparatory state, and the reverse cylinder (30) is discharged with oil, so that the reverse cylinder (30) is in the preparatory state. The second set speed value n2 is less than the first set speed value n1.

6. The vehicle reversing system control method according to claim 1, characterized in that, In step S110, the pressure in the forward cylinder (20) reaches the forward preparation pressure p. f1 And the pressure inside the retraction cylinder (30) reaches the retraction preparation pressure p. r1 Previously, the oil filling process of the forward cylinder (20) and the oil filling process of the reverse cylinder (30) were carried out simultaneously.

7. A vehicle reversing system, characterized in that, The vehicle reversing system employs the vehicle reversing system control method as described in any one of claims 1-6, comprising: The output shaft, the forward clutch, the reverse clutch, the forward cylinder (20), the reverse cylinder (30), the forward input shaft, the reverse input shaft, and the gearbox, wherein the output shaft is connected to the gearbox; The forward clutch includes a separable first forward half clutch and a second forward half clutch, the first forward half clutch is connected to the output shaft, the second forward half clutch is connected to the forward input shaft, and the output end of the forward cylinder (20) is connected to the first forward half clutch or the second forward half clutch. The reversing clutch includes a first reversing half clutch and a second reversing half clutch that can be detachably connected. The first reversing half clutch is connected to the output shaft, and the second reversing half clutch is connected to the reversing input shaft. The output end of the reversing cylinder (30) is connected to the first reversing half clutch or the second reversing half clutch.

8. The vehicle reversing system according to claim 7, characterized in that, The vehicle reversing system also includes a hydraulic tank (10) and a hydraulic pump (40); The hydraulic pump (40) is connected to the hydraulic oil tank (10) and selectively connected to the oil inlet of the forward cylinder (20) and the oil inlet of the reverse cylinder (30). The hydraulic pump (40) can pump the hydraulic oil in the hydraulic oil tank (10) to the forward cylinder (20) or the reverse cylinder (30) so that the forward cylinder (20) is filled with oil and actuated, thereby engaging the first forward half clutch and the second forward half clutch; or so that the reverse cylinder (30) is filled with oil and actuated, thereby engaging the first reverse half clutch and the second reverse half clutch. The oil outlet of the forward cylinder (20) and the oil outlet of the reverse cylinder (30) are selectively connected to the hydraulic oil tank (10). The hydraulic oil in the forward cylinder (20) or the reverse cylinder (30) can be discharged to the hydraulic oil tank (10) so that the forward cylinder (20) can be activated to disengage the first forward half clutch from the second forward half clutch, or the reverse cylinder (30) can be activated to disengage the first reverse half clutch from the second reverse half clutch.

9. The vehicle reversing system according to claim 8, characterized in that, The vehicle reversing system also includes a forward control valve (50) and a reverse control valve (60), which are respectively connected to the hydraulic pump (40). The forward control valve (50) is connected to the forward cylinder (20), and the reverse control valve (60) is connected to the reverse cylinder (30). The forward cylinder (20) can be filled or drained by the forward control valve (50), and the reverse cylinder (30) can be filled or drained by the reverse control valve (60).

10. The vehicle reversing system according to claim 8, characterized in that, The vehicle reversing system also includes a suction filter (70) and a pressure filter (80). The suction filter (70) is located between the oil inlet of the hydraulic pump (40) and the hydraulic oil tank (10), and the pressure filter (80) is located downstream of the outlet of the hydraulic pump (40).

11. A vehicle, characterized in that, Includes wheels and a vehicle reversing system as described in any one of claims 7-10, wherein the wheels are connected to the output shaft.

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