Transmission gear shifting mechanism control system and gear shifting control method

Abstract

The invention provides a transmission gear shifting mechanism control system and a gear shifting control method, relates to the field of gear shifting mechanism control, and adopts the technical scheme that the transmission gear shifting mechanism control system comprises a switching valve and further comprises a gear shifting oil cylinder, and a piston rod of the gear shifting oil cylinder is connected with a shifting fork shaft; the gear shifting valve group comprises a pressure regulating valve I and a pressure regulating valve II, and the pressure regulating valve I and the pressure regulating valve II are respectively communicated with two oil inlets of the gear shifting oil cylinder; the oil inlet end of the gear shifting oil pump is communicated with a lubricating oil tank, the oil outlet end of the gear shifting oil pump is communicated with a lubricating system through a switching valve, and the oil outlet end of the gear shifting oil pump is communicated with the gear shifting valve set. Hydraulic control can be used for replacing electric control for gear shifting, the structure is simple, and the cost needed by gear expansion is low.

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 the current commercial vehicles' pursuit of driving comfort and energy cleanliness continues to improve, commercial vehicle gearboxes are also developing towards AMT gearboxes, AT gearboxes, pure electric gearboxes, and electric drive axles.

[0003] In the related art, a gearbox electronically controlled shifting mechanism is disclosed. When the shift controller makes a shift request to one side, the drive motor is controlled to rotate in the corresponding direction, and the output shaft of the drive motor drives the worm to rotate synchronously. The worm drives the worm wheel to rotate in the corresponding direction through the worm and worm gear transmission. The worm wheel drives the worm wheel shaft to rotate in the corresponding direction through the internal spline. The worm wheel shaft drives the shift fork shaft to move in the corresponding direction through the gear rack transmission, thereby realizing the corresponding shifting action of the shift fork on the shift fork shaft moving in the translation. When the shift fork moves in the translation to the corresponding position, the position sensor identifies the high-strength magnet on the shift fork shaft, outputs a drive motor locking signal to the shift controller, and stops the drive motor from rotating.

[0004] However, with the above-mentioned electronically controlled gear selection and shifting mechanism, one drive motor can only control two gears. When the gear range of the gearbox needs 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 gear range. Summary of the invention

[0005] In order to solve the technical problem of high cost and difficulty in expanding the gear positions of a 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 the transmission lubricating oil to control the shift oil cylinder, instead of electric shifting, which greatly reduces the cost of the shift mechanism. At the same time, there is no problem of heat dissipation, 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 driving 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, and can provide power with the help of the driving motor of the lubricating oil pump, thereby eliminating the arrangement of the driving motor in the shift control system and further reducing the cost.

[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 sent back 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 of the drive motor, and saving electric energy.

[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 one and the pressure regulating valve two both adopt pilot-operated proportional pressure regulating valves, the pilot-operated proportional pressure regulating valves include 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-operated proportional pressure regulating valve to accurately shift gears, and 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 a driving motor, a switching valve, a shift oil pump and a 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, part of the 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, when the speed of the driving motor is increased, 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), thereby reducing the amount of oil entering the lubrication system, reducing the load of the drive motor, and saving electric energy.

[0024] It can be seen from the above technical solutions that the present invention has the following advantages: The invention provides a transmission shift mechanism control system and a shift control method. By setting a shift oil pump, a shift valve group and a 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 problem of heat dissipation, the development difficulty is relatively small, and it is convenient for the expansion of commercial vehicle gears. By connecting the shift oil pump in series with the lubricating oil pump of the lubricating system, power can be provided by means of a driving motor of the lubricating oil pump, eliminating the arrangement of the driving motor in the shift control system, and further reducing the cost. 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 sent back to the oil suction port of the lubricating oil pump during shifting, reducing the amount of oil flowing to the lubricating system during shifting, reducing the load of the driving motor, and saving electric energy. By setting a relief valve, the stability of the oil pressure of the control system can be ensured, and the hydraulic components can be prevented from being damaged by excessive pressure. By using a pilot proportional pressure regulating valve, the pressure on both sides of the shift oil cylinder can be adjusted 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. By sharing the solenoid valve, the number of solenoid valves is reduced, and the cost is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the structure of controlling two gears according to a specific implementation manner of the present invention.

[0027] 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. lubrication oil pump. DETAILED DESCRIPTION

[0028] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme 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 creative work are within the scope of protection of this patent. Specific implementation method 1 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 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 106, and the pressure regulating valve 105 and the pressure regulating valve 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.

[0030] This specific embodiment provides a shift oil pump 101, a shift valve group and a shift oil cylinder, and can use the transmission lubricating oil to control the shift oil cylinder, thereby achieving gear shifting, replacing electric shifting, and greatly reducing the cost of the shift mechanism. At the same time, there is no problem of heat dissipation, and the development difficulty is relatively small, which is convenient for the expansion of commercial vehicle gears.

[0031] 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 for oil supply, eliminating the need for the motor of the control system, reducing costs while reducing space occupancy, and further providing convenient space conditions for gear expansion; in the present specific embodiment, since the amount of oil required by the lubrication system 2 is greater than that of the present control system, but the required oil pressure is less than that of the present control system, the shift oil pump 101 of the present 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 relatively small, it will not have a significant impact on the lubrication system 2.

[0032] like Figure 1As shown, in this specific embodiment, the oil inlet of the switching valve 108 can be connected to the oil outlet 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 driving motor 202, the power reduction of the shifting oil pump 101 affects the shifting work of the system. If the output power of the driving 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, i.e., 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.

[0033] 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 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.

[0034] 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 1 105 and pressure regulating valve 2 106 both adopt pilot proportional pressure regulating valves, the pilot proportional pressure regulating valve includes 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.

[0035] 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 .

[0036] In this specific embodiment, the pilot valve 104 , the solenoid valve 103 and the drive motor 202 are all connected to the controller.

[0037] When expanding the gear position, it is sufficient to add a shift cylinder and a corresponding pressure regulating valve. 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 prior art 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 internal space of the gearbox and is easy to expand. Specific implementation method 2 The present specific embodiment provides a transmission shift mechanism shift control method, which adopts the transmission shift mechanism control system 1 of the specific embodiment 1, and includes the following steps: after receiving the shift command 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 enters the pressure regulating valve 1 105 and the pressure regulating valve 2 106 respectively through the relief valve 102, and 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 with different pressures to ensure that the pressure regulating valve 1 105 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 with 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, while the speed of the drive motor 202 is increased, 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.

[0039] From the above specific implementations, it can be seen that the present invention has the following beneficial effects: 1. By providing the shift oil pump 101, the shift valve group and the shift oil cylinder, the gearbox lubricating oil can be used to control the shift oil cylinder, replacing the electric shift, greatly reducing the cost of the shift mechanism. At the same time, there is no problem of heat dissipation, the development difficulty is relatively small, and it is convenient for the expansion of commercial vehicle gears; 2. By connecting the shift oil pump 101 in series with the lubricating oil pump 203 of the lubricating system 2, the drive motor 202 of the lubricating oil pump 203 can be used to provide power, thereby eliminating the arrangement of the drive motor 202 in the shift control system and further reducing the cost; 3. By connecting the switching valve 108 with the lubricating oil pump 203 and the oil tank 201, part of the oil pumped out by the lubricating oil pump 203 can be sent back to the oil suction port of the lubricating oil pump 203 during gear shifting, thereby reducing the amount of oil flowing to the lubrication system 2 during gear shifting, reducing the load of the drive motor 202, and saving electric energy; 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; 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; 6. By sharing the solenoid valve 103, the number of solenoid valves 103 is reduced, further reducing the cost.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be 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 will not be limited to the embodiments shown herein, but rather 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 first pressure regulating valve (105) and a second pressure regulating valve (106), the first pressure regulating valve (105) and the second pressure regulating valve (106) being respectively connected to two oil inlets of the shift oil cylinder; A gear shift oil pump (101), wherein an oil inlet end of the gear shift oil pump (101) is in communication with a lubricating oil tank (201), and an oil outlet end of the gear shift oil pump (101) is in communication with the gear shift valve group.

2. The transmission shift mechanism control system according to claim 1, characterized in that: 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); an oil inlet end of the lubricating oil pump (203) is connected to a lubricating oil tank (201); an oil outlet end of the lubricating oil pump (203) is connected to a lubricating system (2); and the oil outlet end of the shift oil pump (101) is connected to the lubricating system (2) via a switching valve (108).

3. The transmission shift mechanism control system according to claim 2, characterized in that: 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).

4. The transmission shift mechanism control system according to claim 3, characterized in that: The shift valve group further comprises 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 first pressure regulating valve (105) and the second pressure regulating valve (106) respectively.

5. The transmission shift mechanism control system according to claim 4, characterized in that: The first pressure regulating valve (105) and the second pressure regulating valve (106) are both pilot-operated proportional pressure regulating valves, the pilot-operated proportional pressure regulating valves comprising a pilot valve (104), the shift valve group further comprising a pressure reducing valve (107), the oil inlet of the pressure reducing valve (107) being connected to the oil outlet of the overflow valve (102), and the oil outlet of the pressure reducing valve (107) being respectively connected to the two pilot valves (104).

6. The transmission shift mechanism control system according to claim 5, characterized in that: The switching valve (108) and the overflow valve (102) share a solenoid valve (103).

7. The transmission shift mechanism control system according to claim 6, characterized in that: The pilot valve (104), the solenoid valve (103) and the drive motor (202) are all in communication with a controller.

8. A transmission shift mechanism shift control method, characterized in that: The transmission shift mechanism control system according to claim 7 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.

9. The transmission shift mechanism shift control method according to claim 8, characterized in that: 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 pressure regulating valve 1 and pressure regulating valve 2 respectively through the overflow valve. At the same time, part of the 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.

10. The transmission shift mechanism shift control method according to claim 9, characterized in that: 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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