A transmission shift mechanism control system and a shift control method

Abstract

The application provides a transmission gear shifting mechanism control system and a gear shifting control method, and relates to the field of gear shifting mechanism control.The application adopts the following scheme: the system comprises a switching valve and further comprises a gear shifting oil cylinder, a gear shifting valve group, a gear shifting oil pump and a lubricating oil tank.The piston rod of the gear shifting oil cylinder is connected with a shift fork shaft.The gear shifting valve group comprises a pressure regulating valve I and a pressure regulating valve II.The pressure regulating valve I and the pressure regulating valve II are respectively connected with two oil inlets of the gear shifting oil cylinder.The oil inlet end of the gear shifting oil pump is connected with the lubricating oil tank.The oil outlet end of the gear shifting oil pump is connected with the lubricating system through the switching valve.The oil outlet end of the gear shifting oil pump is connected with the gear shifting valve group.The application can use hydraulic control instead of electric control to perform gear shifting, and has simple structure and low cost required for gear position expansion.

Description

Technical Field

[0001] The present invention relates to the field of shift mechanism control, and in particular to a transmission shift mechanism control system and a shift control method. Background Art

[0002] As commercial vehicles' pursuit of driving comfort and clean energy continues to improve, commercial vehicle gearboxes are also developing towards AMT gearboxes, AT gearboxes, pure electric gearboxes, and electric drive axles.

[0003] Related art discloses an electronically controlled shift mechanism for a transmission. When a shift controller requests a shift to one side, it controls the drive motor to rotate in the corresponding direction. The drive motor's output shaft drives the worm to rotate synchronously. The worm, through the worm-gear transmission, drives the worm wheel in the corresponding direction. The worm wheel, through its internal spline, drives the worm wheel shaft to rotate in the corresponding direction. The worm wheel shaft, through a rack and pinion transmission, drives the shift fork shaft to translate in the corresponding direction, thereby achieving the corresponding shifting action caused by the translation of the shift fork on the fork shaft. When the shift fork translates to the corresponding position, a position sensor identifies the high-strength magnet on the shift fork shaft and outputs a drive motor lock signal to the shift controller, stopping the drive motor.

[0004] However, with the above-mentioned electronically controlled gear selection and shifting mechanism, one drive motor can only control two gears. When the gears of the gearbox need to be expanded, a corresponding number of drive motors and worm gear mechanisms need to be added, which increases the cost. In addition, the structure is complicated and numerous, which greatly occupies the internal space of the gearbox, making it difficult to expand the gears. Summary of the Invention

[0005] In order to solve the technical problem of high cost and difficulty in expanding the gear positions of the transmission shift mechanism control system in the above-mentioned prior art, the present invention provides a transmission shift mechanism control system and a shift control method, which can use hydraulic control instead of electric control for shifting, and the cost required for gear expansion is relatively low.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a transmission shift mechanism control system, including a switching valve, and also including: a shift cylinder, the piston rod of the shift cylinder is connected to the fork shaft; a shift valve group, the shift valve group includes a pressure regulating valve 1 and a pressure regulating valve 2, the pressure regulating valve 1 and the pressure regulating valve 2 are respectively connected to the two oil inlets of the shift cylinder; a shift oil pump, the oil inlet end of the shift oil pump is connected to the lubricating oil tank, the oil outlet end of the shift oil pump is connected to the lubrication system through the switching valve, and the oil outlet end of the shift oil pump is connected to the shift valve group.

[0007] The present invention provides a shift oil pump, a shift valve group and a shift oil cylinder, and can use transmission lubricating oil to control the shift oil cylinder, replacing electric shifting, greatly reducing the cost of the shift mechanism. At the same time, there is no heat dissipation problem, the development difficulty is relatively small, and it is convenient for commercial vehicle gear expansion.

[0008] Furthermore, the shift oil pump can be connected in series with the lubricating oil pump, the lubricating oil pump is connected to a drive motor, the oil inlet end of the lubricating oil pump is connected to the lubricating oil tank, the oil outlet end of the lubricating oil pump is connected to the lubrication system, and the oil outlet end of the shift oil pump is connected to the lubrication system through a switching valve.

[0009] The present invention connects the shift oil pump in series with the lubricating oil pump of the lubrication system, thereby providing power with the help of the drive motor of the lubricating oil pump, eliminating the arrangement of the drive motor in the shift control system and further reducing costs.

[0010] Furthermore, the oil inlet of the switching valve can be communicated with the oil outlet of the lubricating oil pump, and the oil outlet of the switching valve can be communicated with the lubricating oil tank.

[0011] The present invention connects the switching valve with the lubricating oil pump and the oil tank, so that part of the oil pumped out by the lubricating oil pump can be returned to the oil suction port of the lubricating oil pump during gear shifting, thereby reducing the amount of oil flowing to the lubrication system during gear shifting, reducing the load on the drive motor, and saving electricity.

[0012] Furthermore, the shift valve group also includes a relief valve, the oil inlet of the relief valve is connected to the oil outlet of the switching valve, and the oil outlet of the relief valve is connected to the pressure regulating valve 1 and the pressure regulating valve 2 respectively.

[0013] The present invention can ensure the stability of the oil pressure of the control system by arranging the overflow valve, and avoid damage to the hydraulic components due to excessive pressure.

[0014] Furthermore, the pressure regulating valve 1 and the pressure regulating valve 2 both adopt pilot proportional pressure regulating valves, the pilot proportional pressure regulating valve includes a pilot valve, the shift valve group also includes a pressure reducing valve, the oil inlet of the pressure reducing valve is connected to the oil outlet end of the overflow valve, and the oil outlet of the pressure reducing valve is respectively connected to the two pilot valves.

[0015] The present invention can adjust the pressure on both sides of the shift oil cylinder by using a pilot proportional pressure regulating valve to accurately shift gears. At the same time, a pressure reducing valve is provided to prevent the control system pressure from being too high and causing impact on the pilot valve.

[0016] Furthermore, the switching valve and the overflow valve share a solenoid valve.

[0017] The present invention reduces the number of solenoid valves by sharing the solenoid valves, thereby further reducing the cost.

[0018] Furthermore, the pilot valve, the solenoid valve and the drive motor are all connected to a controller.

[0019] In the second aspect, the present invention also provides a transmission shift mechanism shift control method, which adopts the above-mentioned transmission shift mechanism control system, including the following steps: after receiving the shift command, the speed of the drive motor is increased, the switching valve and the overflow valve are actuated, the shift oil pump is no longer connected to the lubrication system, and the oil enters the shift valve group through the shift oil pump and the switching valve, and the shift valve group controls the piston rod of the shift cylinder to move in the set direction to achieve shifting.

[0020] The present invention realizes the use of transmission lubricating oil to control the shifting of the shift cylinder by the cooperation of the driving motor, the switching valve, the shift oil pump and the shift valve group, replacing electric control, which has low cost, no heat dissipation problem and is convenient for gear expansion.

[0021] Furthermore, after receiving the shift command, the controller controls the two pilot valves to adjust the output oil pressure respectively. After the oil passes through the shift oil pump and the switching valve, it enters the pressure regulating valve 1 and the pressure regulating valve 2 respectively through the overflow valve. At the same time, some oil enters the pressure reducing valve through the overflow valve. The oil is reduced in pressure through the pressure reducing valve and enters the corresponding pilot valves respectively. Different pilot valves output oil of different pressures.

[0022] Furthermore, as the speed of the drive motor increases, the switching valve returns the oil input by the lubricating oil pump to the lubricating oil tank.

[0023] The present invention controls the switching valve to return part of the oil to the oil tank (i.e., the oil suction port of the lubricating oil pump), which can reduce the amount of oil entering the lubrication system, reduce the load on the drive motor, and save electricity.

[0024] It can be seen from the above technical solutions that the present invention has the following advantages:

[0025] The present invention provides a transmission shift mechanism control system and shift control method. By providing a shift oil pump, a shift valve group, and a shift oil cylinder, the shift oil cylinder can be controlled by transmission lubricating oil, replacing electric shifting, greatly reducing the cost of the shift mechanism. At the same time, there is no heat dissipation problem, the development difficulty is relatively low, and it is convenient for expanding the gear range of commercial vehicles. By connecting the shift oil pump in series with the lubricating oil pump of the lubrication system, power can be provided by the drive motor of the lubricating oil pump, eliminating the arrangement of the drive motor in the shift control system, further reducing costs. By connecting the switching valve with the lubricating oil pump and the oil tank, part of the oil pumped out by the lubricating oil pump can be returned to the oil suction port of the lubricating oil pump during shifting, reducing the amount of oil flowing to the lubrication system during shifting, reducing the load on the drive motor, and saving electricity. By providing a relief valve, the stability of the oil pressure of the control system can be ensured, preventing damage to hydraulic components due to excessive pressure. By using a pilot-operated proportional pressure regulating valve, the pressure on both sides of the control shift oil cylinder can be adjusted to accurately perform shifting. At the same time, a pressure reducing valve is provided to prevent excessive pressure in the control system from impacting the pilot valve. By sharing the solenoid valve, the number of solenoid valves is reduced, further reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the structure of controlling two gears in a specific embodiment of the present invention.

[0028] In the figure, 1. Transmission shift mechanism control system; 101. Shift oil pump; 102. Overflow valve; 103. Solenoid valve; 104. Pilot valve; 105. Pressure regulating valve 1; 106. Pressure regulating valve 2; 107. Pressure reducing valve; 108. Switching valve; 2. Lubrication system; 201. Oil tank; 202. Drive motor; 203. Lubricating oil pump. DETAILED DESCRIPTION

[0029] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent. Specific implementation method 1

[0031] like Figure 1As shown, this specific embodiment provides a transmission shift mechanism control system, including a switching valve 108, a shift cylinder, a shift valve group and a shift oil pump 101, the piston rod of the shift cylinder is connected to the shift fork shaft, and the oil outlet of the shift cylinder is connected to the transmission housing; the shift valve group includes a pressure regulating valve 105 and a pressure regulating valve 2 106, and the pressure regulating valve 105 and the pressure regulating valve 2 106 are respectively connected to the two oil inlets of the shift cylinder; the oil inlet end of the shift oil pump 101 is connected to the lubricating oil tank 201, the oil outlet end of the shift oil pump 101 is connected to the lubrication system 2 through the switching valve 108, and the oil outlet end of the shift oil pump 101 is connected to the shift valve group.

[0032] This specific embodiment provides a shift oil pump 101, a shift valve group and a shift oil cylinder, and can use transmission lubricating oil to control the shift oil cylinder to achieve shifting, replacing electric shifting, greatly reducing the cost of the shift mechanism. At the same time, there is no heat dissipation problem, the development difficulty is relatively small, and it is convenient for the expansion of commercial vehicle gears.

[0033] like Figure 1 As shown, in order to further reduce the cost of the control system, in this specific embodiment, the shift oil pump 101 can be connected in series with the lubricating oil pump 203, the lubricating oil pump 203 is connected to the driving motor 202, the oil inlet end of the lubricating oil pump 203 is connected to the lubricating oil tank 201, and the oil outlet end of the lubricating oil pump 203 is connected to the lubricating system 2. In order to avoid increasing the load of the driving motor 202, the oil outlet end of the shift oil pump 101 is connected to the lubricating system 2 through the switching valve 108. When not shifting, the oil of the shift oil pump 101 enters the lubricating system 2 through the switching valve 108; after such arrangement, the driving motor of the lubricating system 2 The engine 202 can drive the lubricating oil pump 203 and the shift oil pump 101 to rotate together to supply oil, eliminating the need for the motor of this control system, reducing costs while reducing space occupancy, and further providing convenient space conditions for gear expansion; in this specific embodiment, since the amount of oil required by the lubrication system 2 is greater than that of this control system, but the required oil pressure is less than that of this control system, the shift oil pump 101 of this system is a small-displacement high-pressure oil pump relative to the lubricating oil pump 203. At the same time, since the gear shift is instantaneous high pressure and the flow rate pumped into the gear shift fluid circuit by the shift oil pump 101 is small, it will not have a major impact on the lubrication system 2.

[0034] like Figure 1As shown, in this specific embodiment, the oil inlet of the switching valve 108 can be connected to the oil outlet end of the lubricating oil pump 203, and the oil outlet of the switching valve 108 can be connected to the lubricating oil tank 201; after such arrangement, when shifting, due to the increased demand for oil, the speed of the driving motor 202 needs to be increased, so that the shift oil pump 101 pumps oil into the shift fluid circuit with higher pressure. At this time, the oil pumping amount of the lubricating oil pump 203 will also increase, thereby increasing the oil amount in the lubrication system 2. Since the load of the lubrication system 2 is relatively large, After the oil volume is increased, the corresponding power of the lubricating oil pump 203 will increase. Without increasing the output power of the drive motor 202, the power reduction of the shift oil pump 101 affects the shifting work of this system. If the output power of the drive motor 202 is increased, unnecessary waste of electric energy will be caused. For this reason, a part of the oil pumped out by the lubricating oil pump 203 is returned to the oil tank 201, that is, the oil suction port position of the lubricating oil pump 203, through the switching valve 108, which can prevent excessive oil from entering the lubrication system 2, reduce the load, and thus avoid power loss.

[0035] like Figure 1 As shown, in this specific embodiment, the shift valve group also includes a relief valve 102, the oil inlet of the relief valve 102 is connected to the oil outlet end of the switching valve 108, and the oil outlet of the relief valve 102 is respectively connected to the pressure regulating valve 105 and the pressure regulating valve 2 106; by setting the relief valve 102, the stability of the oil pressure of the control system can be ensured, and the damage to the hydraulic components due to excessive pressure can be avoided.

[0036] like Figure 1 As shown, in order to adjust the pressure at both ends of the shift cylinder and control its movement direction to achieve accurate shifting, in this specific embodiment, pressure regulating valve 105 and pressure regulating valve 2 106 both adopt pilot proportional pressure regulating valves, which include a pilot valve 104. The pilot valve 104 adopts a proportional solenoid valve 103. The shift valve group also includes a pressure reducing valve 107. The oil inlet of the pressure reducing valve 107 is connected to the oil outlet end of the overflow valve 102, and the oil outlet of the pressure reducing valve 107 is respectively connected to the two pilot valves 104; since the oil pressure required by the pilot valve 104 is relatively low, in order to avoid damage to it by the oil pressure of this system, a pressure reducing valve 107 is additionally provided to reduce the pressure.

[0037] like Figure 1 As shown, since the switching valve 108 and the relief valve 102 operate in unison during gear shifting, in order to further reduce costs, in this specific embodiment, the switching valve 108 and the relief valve 102 share a solenoid valve 103 .

[0038] In this specific embodiment, the pilot valve 104 , the solenoid valve 103 and the drive motor 202 are all connected to the controller.

[0039] When expanding the gears, it is sufficient to add shift cylinders and corresponding pressure regulating valves. One shift cylinder controls two gears, and two pressure regulating valves control the left and right movement of the shift cylinder. For example, when expanding to three or four gears, two shift cylinders and four pressure regulating valves are required. When expanding to seven or eight gears, four shift cylinders and eight pressure regulating valves are required. Compared with the existing technology of adding a corresponding number of motors and worm gear mechanisms, there is no heat dissipation problem, the cost is greatly reduced, and there is no need for an intermediate transmission mechanism, which occupies relatively less space inside the gearbox and is easy to expand. Specific implementation method 2

[0041] The present embodiment provides a transmission shift mechanism shift control method, which adopts the transmission shift mechanism control system 1 of the embodiment 1, including the following steps: after receiving the shift instruction of the controller, the speed of the drive motor 202 is increased to the set speed, the switching valve 108 and the relief valve 102 are actuated, the shift oil pump 101 is no longer connected to the lubrication system 2, and the oil pumped out by the shift oil pump 101 enters the shift valve group through the shift oil pump 101 via the switching valve 108, and the shift valve group controls the piston rod of the shift oil cylinder to move in the set direction to achieve shifting; specifically, the controller controls the two pilot valves 104 to adjust the output oil pressure respectively, and the oil passes through the shift oil pump 101 through the switching valve 108 and then passes through the relief valve 102 to enter the pressure regulating valve 1 105 and the pressure regulating valve 2 106 respectively. At the same time, part of the oil passes through the relief valve 10 2 enters the pressure reducing valve 107, and the oil is reduced in pressure by the pressure reducing valve 107 and enters the corresponding pilot valve 104 respectively. Different pilot valves 104 output oil of different pressures to ensure that the pressure regulating valve 105 and the pressure regulating valve 2 106 output the set oil pressure, control the shift cylinder to move in the set direction, and the oil outlet of the shift cylinder is connected to the gearbox housing, and the oil in the shift cylinder returns to the gearbox housing; as a preferred embodiment, in order to reduce the load of the drive motor 202, the speed of the drive motor 202 is increased, and the switching valve 108 returns the oil input by the lubricating oil pump 203 to the lubricating oil tank 201; after the shift is completed, the switching valve 108 and the relief valve 102 are actuated to connect the shift oil pump 101 with the lubrication system 2, and at the same time cut off the oil path of the oil returning to the oil tank 201, the drive motor 202 is reduced to the speed under the lubrication condition, and the relief valve 102 is closed.

[0042] From the above specific embodiments, it can be seen that the present invention has the following beneficial effects:

[0043] 1. By providing the shift oil pump 101, the shift valve group, and the shift oil cylinder, the transmission lubricating oil can be used to control the shift oil cylinder, replacing electric shifting, greatly reducing the cost of the shift mechanism. At the same time, there is no heat dissipation problem, the development difficulty is relatively low, and it is convenient for the expansion of commercial vehicle gear positions.

[0044] 2. By connecting the shift oil pump 101 in series with the lubricating oil pump 203 of the lubrication system 2, the drive motor 202 of the lubricating oil pump 203 can be used to provide power, eliminating the need for the drive motor 202 in the shift control system, further reducing costs.

[0045] 3. By connecting the switching valve 108 to the lubricating oil pump 203 and the oil tank 201, part of the oil pumped out by the lubricating oil pump 203 can be returned to the oil suction port of the lubricating oil pump 203 during gear shifting, thereby reducing the amount of oil flowing into the lubrication system 2 during gear shifting, reducing the load on the drive motor 202, and saving electricity;

[0046] 4. The relief valve 102 can ensure the stability of the oil pressure of the control system and avoid damage to the hydraulic components due to excessive pressure;

[0047] 5. By using a pilot-operated proportional pressure regulating valve, the pressure on both sides of the shift cylinder can be adjusted to accurately shift gears. At the same time, a pressure reducing valve 107 is provided to prevent the control system pressure from being too high and causing impact on the pilot valve 104.

[0048] 6. By sharing the solenoid valve 103 , the number of solenoid valves 103 is reduced, further reducing costs.

[0049] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A transmission shift mechanism control system, comprising a switching valve (108), characterized in that: Also includes: A shift cylinder, the piston rod of which is connected to the shift fork shaft; A shift valve group, the shift valve group comprising a pressure regulating valve 1 (105) and a pressure regulating valve 2 (106), the pressure regulating valve 1 (105) and the pressure regulating valve 2 (106) being respectively connected to two oil inlets of the shift oil cylinder; a shift oil pump (101), wherein the oil inlet end of the shift oil pump (101) is connected to the lubricating oil tank (201), and the oil outlet end of the shift oil pump (101) is connected to the shift valve group; The shift oil pump (101) can be connected in series with the lubricating oil pump (203), the lubricating oil pump (203) is connected to a drive motor (202), the oil inlet of the lubricating oil pump (203) is in communication with the lubricating oil tank (201), the oil outlet of the lubricating oil pump (203) is in communication with the lubricating system (2), and the oil outlet of the shift oil pump (101) is in communication with the lubricating system (2) via a switching valve (108); The oil inlet of the switching valve (108) can be communicated with the oil outlet of the lubricating oil pump (203), and the oil outlet of the switching valve (108) can be communicated with the lubricating oil tank (201); The shift valve group further includes a relief valve (102), the oil inlet of the relief valve (102) being connected to the oil outlet of the switching valve (108), and the oil outlet of the relief valve (102) being connected to the pressure regulating valve 1 (105) and the pressure regulating valve 2 (106) respectively; The pressure regulating valve 1 (105) and the pressure regulating valve 2 (106) both adopt pilot-operated proportional pressure regulating valves, the pilot-operated proportional pressure regulating valves include a pilot valve (104), the shift valve group also includes a pressure reducing valve (107), the oil inlet of the pressure reducing valve (107) is connected to the oil outlet end of the overflow valve (102), and the oil outlet of the pressure reducing valve (107) is respectively connected to the two pilot valves (104).

2. The transmission shift mechanism control system according to claim 1, wherein: The switching valve (108) and the overflow valve (102) share a solenoid valve (103).

3. The transmission shift mechanism control system according to claim 2, wherein: The pilot valve (104), the solenoid valve (103) and the drive motor (202) are all in communication with a controller.

4. A transmission shift mechanism shift control method, characterized in that: The transmission shift mechanism control system according to claim 3 comprises the following steps: After receiving the shift command, the speed of the drive motor increases, the switching valve and the relief valve are activated, the shift oil pump is no longer connected to the lubrication system, and the oil enters the shift valve group through the shift oil pump and the switching valve. The shift valve group controls the piston rod of the shift cylinder to move in the set direction to achieve gear shifting.

5. The transmission shift mechanism shift control method according to claim 4, wherein: After receiving the shift command, the controller controls the two pilot valves to adjust the output oil pressure respectively. After the oil passes through the shift oil pump and the switching valve, it enters the pressure regulating valve 1 and pressure regulating valve 2 respectively through the overflow valve. At the same time, some oil enters the pressure reducing valve through the overflow valve. The oil is reduced in pressure through the pressure reducing valve and enters the corresponding pilot valves respectively. Different pilot valves output oil with different pressures.

6. The transmission shift mechanism shift control method according to claim 5, wherein: As the speed of the drive motor increases, the switching valve returns the oil input by the lubricating oil pump to the lubricating oil tank.

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