A four-speed transmission control system and working method thereof

Abstract

The present invention relates to a four-speed transmission control system and a working method thereof, comprising a hydraulic valve block, an oil tank, an oil inlet circuit and a lubricating oil circuit, wherein each oil outlet of the hydraulic valve block is respectively connected to the oil chambers at the K1, K2, K3 and K4 ends of the clutch; the oil outlet end of the oil tank is connected to the oil inlet of the hydraulic valve block via the oil inlet circuit; the lubricating oil circuit comprises a lubricating oil delivery main circuit connected to the oil outlet end of the oil tank at one end, and the other end of the lubricating oil delivery main circuit is connected to a first supplementary oil circuit and a lubricating oil delivery branch circuit in parallel, wherein the first supplementary oil circuit is connected to the oil inlet circuit. The present invention is reasonably designed, and the oil in the lubricating oil circuit can be input into the oil inlet circuit through the first supplementary oil circuit, so that two metering pumps work simultaneously to supply oil to the hydraulic valve block, ensuring that the clutch piston has sufficient working pressure and ensuring smooth gear shifting.

Description

Technical field:

[0001] The invention relates to a four-speed transmission control system and a working method thereof. Background technology:

[0002] The four-speed transmission needs to supply oil to the oil chamber of the clutch during operation. However, the existing four-speed transmission has a complicated oil supply structure and the gear shifting is not smooth enough. Summary of the invention:

[0003] The present invention makes improvements to the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the present invention is to provide a four-speed transmission control system and a working method thereof.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a four-speed transmission control system, including a hydraulic valve block, an oil tank, an oil inlet circuit and a lubricating oil circuit, wherein the oil outlets of the hydraulic valve block are respectively connected to the oil chambers at the K1, K2, K3 and K4 ends of the clutch; the oil outlet end of the oil tank is connected to the oil inlet of the hydraulic valve block via the oil inlet circuit; the lubricating oil circuit includes a main lubricating oil delivery circuit having one end connected to the oil outlet end of the oil tank, and the other end of the main lubricating oil delivery circuit is connected to a first supplementary oil circuit and a lubricating oil delivery branch circuit in parallel, and the first supplementary oil circuit is connected to the oil inlet circuit.

[0005] Furthermore, the hydraulic valve block includes an oil inlet pipe connected to the oil inlet circuit on the main valve block, and the oil inlet pipe leads to the oil inlets of the first proportional valve and the second proportional valve respectively through the first one-way valve; the oil outlet of the first proportional valve is connected to the oil inlet of the first reversing valve, and the oil outlet of the second proportional valve is connected to the oil inlet of the second reversing valve; the A\B ends of the first reversing valve are connected to the oil chambers of the K1 and K2 ends of the clutch respectively through the first oil outlet filter element, and the A\B ends of the second reversing valve are connected to the oil chambers of the K3 and K4 ends of the clutch respectively through the second oil outlet filter element; the first reversing valve and the second reversing valve both adopt three-position four-way electromagnetic reversing valves.

[0006] Furthermore, the hydraulic valve block also includes a third proportional valve and a third reversing valve. The oil inlet of the third proportional valve is connected to the oil inlet pipe, the oil outlet of the third proportional valve is connected to the oil inlet of the third reversing valve, the oil outlet of the third reversing valve is connected to the oil return ports of the first reversing valve and the second reversing valve, and the third reversing valve adopts a two-position three-way electromagnetic reversing valve.

[0007] Furthermore, the lubricating oil delivery branch is connected to a main lubricating oil circuit, the main lubricating oil circuit is connected to a second supplementary oil circuit, and the second supplementary oil circuit is connected to an oil return port of a third reversing valve.

[0008] Furthermore, the lubricating oil delivery branch is also connected to a secondary lubricating oil circuit in parallel with the main lubricating oil circuit, and the secondary lubricating oil circuit is used to deliver lubricating oil to the mechanical platform valve block.

[0009] Furthermore, a fourth reversing valve is installed on the lubricating oil delivery branch, and the fourth reversing valve is used to control the on-off of the lubricating oil delivery branch.

[0010] Furthermore, the oil inlet circuit is provided with a first metering pump, at least one first filter element and a second one-way valve in sequence along the delivery direction; the lubricating oil delivery main circuit is provided with a second metering pump and at least one second filter element in sequence along the delivery direction, and an oil circuit for supplying oil to the high-speed motor is provided between the first metering pump and the second metering pump.

[0011] Furthermore, a pressure relief oil circuit composed of a throttle valve and a relief valve connected in series is provided beside the oil inlet circuit, and the pressure relief oil circuit is connected to the oil inlet circuit and the oil tank respectively.

[0012] Furthermore, a heater and an oil suction filter are sequentially arranged at the oil outlet end of the oil tank along the conveying direction, and a radiator is arranged inside the oil tank.

[0013] Another technical solution adopted by the present invention is: a working method of a four-speed transmission control system, and is carried out according to the following steps:

[0014] Step S1: In the initial state, the first proportional valve, the second proportional valve, the third proportional valve, the first reversing valve, the second reversing valve and the third reversing valve are all de-energized;

[0015] Step S2, neutral gear is switched to first gear, and the first clutch and the fourth clutch are closed;

[0016] Step S21: The first proportional valve, the second proportional valve and the third proportional valve are all given a specified voltage, and the oil supply pressure of the first proportional valve and the second proportional valve is greater than the oil pressure of the third proportional valve. Then, the A end of the first reversing valve and the B end of the second reversing valve are energized respectively, and the third reversing valve and the fourth reversing valve are energized respectively; at this time, the first proportional valve supplies oil to the K2 end oil chamber of the clutch, and the piston pushes to the K1 end oil chamber, and the first clutch begins to close; the second proportional valve supplies oil to the K3 end oil chamber of the clutch, and the piston pushes to the K4 end oil chamber, and the fourth clutch begins to close; the third proportional valve supplies oil to the K1 and K4 end oil chambers of the clutch through the third reversing valve;

[0017] Step S22: continuously adjusting the voltages of the first proportional valve, the second proportional valve, and the third proportional valve, so that the pressure difference between the oil chamber at the K1 end and the oil chamber at the K2 end, and between the oil chamber at the K3 end and the oil chamber at the K4 end of the clutch becomes larger and larger, until the first clutch and the fourth clutch are completely closed, and then the third reversing valve, the fourth reversing valve, and the third proportional valve lose power, completing the shifting process;

[0018] Step S3: switching from the first gear to the second gear, and closing the first clutch and the third clutch;

[0019] Step S31: The first proportional valve, the second proportional valve and the third proportional valve are all given a specified voltage, and the oil supply pressure of the first proportional valve and the second proportional valve is greater than the oil pressure of the third proportional valve. Then, the A end of the first reversing valve and the A end of the second reversing valve are energized respectively, and the third reversing valve and the fourth reversing valve are energized respectively; at this time, the first proportional valve supplies oil to the K2 end oil chamber of the clutch, and the piston pushes to the K1 end oil chamber, and the first clutch begins to close; the second proportional valve supplies oil to the K4 end oil chamber of the clutch, and the piston pushes to the K3 end oil chamber, and the third clutch begins to close; the third proportional valve supplies oil to the K1 and K3 end oil chambers of the clutch through the third reversing valve;

[0020] Step S32: continuously adjusting the voltages of the first proportional valve, the second proportional valve, and the third proportional valve, so that the pressure difference between the oil chamber at the K1 end and the oil chamber at the K2 end, and between the oil chamber at the K3 end and the oil chamber at the K4 end of the clutch becomes larger and larger, until the first clutch and the third clutch are completely closed, and then the third reversing valve, the fourth reversing valve, and the third proportional valve lose power, completing the shifting process;

[0021] Step S4, the second gear is switched to the third gear, and the second clutch and the fourth clutch are closed;

[0022] Step S41: The first proportional valve, the second proportional valve and the third proportional valve are all given a specified voltage, and the oil supply pressure of the first proportional valve and the second proportional valve is greater than the oil pressure of the third proportional valve. Then, the B end of the first reversing valve and the B end of the second reversing valve are energized respectively, and the third reversing valve and the fourth reversing valve are energized respectively; at this time, the first proportional valve supplies oil to the K1 end oil chamber of the clutch, the piston pushes to the K2 end oil chamber, and the second clutch begins to close, the second proportional valve supplies oil to the K3 end oil chamber of the clutch, the piston pushes to the K4 end oil chamber, and the fourth clutch begins to close; the third proportional valve supplies oil to the K2 and K4 end oil chambers of the clutch through the third reversing valve;

[0023] Step S42: continuously adjusting the voltages of the first proportional valve, the second proportional valve, and the third proportional valve, so that the pressure difference between the oil chamber at the K1 end and the oil chamber at the K2 end, and between the oil chamber at the K3 end and the oil chamber at the K4 end of the clutch becomes larger and larger, until the second clutch and the fourth clutch are completely closed, and then the third reversing valve, the fourth reversing valve, and the third proportional valve lose power, completing the shifting process;

[0024] Step S5, the third gear is switched to the fourth gear, and the second clutch and the third clutch are closed;

[0025] Step S51: The first proportional valve, the second proportional valve and the third proportional valve are all given a specified voltage, and the oil supply pressure of the first proportional valve and the second proportional valve is greater than the oil pressure of the third proportional valve. Then, the B end of the first reversing valve and the A end of the second reversing valve are energized respectively, and the third reversing valve and the fourth reversing valve are energized respectively; at this time, the first proportional valve supplies oil to the K1 end oil chamber of the clutch, the piston pushes to the K2 end oil chamber, and the second clutch begins to close; the second proportional valve supplies oil to the K4 end oil chamber of the clutch, the piston pushes to the K3 end oil chamber, and the third clutch begins to close; the third proportional valve supplies oil to the K2 and K3 end oil chambers of the clutch through the third reversing valve;

[0026] Step S52: Continuously adjust the voltages of the first proportional valve, the second proportional valve and the third proportional valve to increase the pressure difference between the oil chamber at the K1 end and the oil chamber at the K2 end, and between the oil chamber at the K3 end and the oil chamber at the K4 end of the clutch until the second clutch and the third clutch are completely closed, and then the third reversing valve, the fourth reversing valve and the third proportional valve lose power to complete the shifting process.

[0027] Compared with the prior art, the present invention has the following effects:

[0028] (1) The present invention has a reasonable design. The oil in the lubricating oil circuit can be input into the oil inlet circuit through the first supplementary oil circuit. In this way, the two quantitative pumps work simultaneously to supply oil to the hydraulic valve block, ensuring that the clutch piston has sufficient working pressure and ensuring smooth gear shifting.

[0029] (2) The lubricating oil is delivered to the third reversing valve through the second supplementary oil circuit, and the third reversing valve delivers oil to the clutch pipeline, so that the oil in the pipeline has a certain pressure, which reduces the starting pressure of the transmission and improves the response speed;

[0030] (3) The third proportional valve and the third reversing valve in the hydraulic valve block cooperate to balance the pressure difference in the clutch oil chamber, making the gear shifting smooth. Description of the drawings:

[0031] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention.

[0032] In the figure:

[0033] 1-Hydraulic valve block; 2-Oil tank; 3-Oil inlet circuit; 4-Lubricating oil circuit; 5-Lubricating oil delivery main circuit; 6-First supplementary oil circuit; 7-Lubricating oil delivery branch circuit; 8-Main valve block; 9-Oil inlet pipe; 10-First check valve; 11-First proportional valve; 12-Second proportional valve; 13-Third proportional valve; 14-First reversing valve; 15-Second reversing valve; 16-Third reversing valve; 17-First oil outlet filter element; 18-Second oil outlet filter element; 19-Main lubricating oil circuit; 20-Second supplementary oil circuit; 21-Auxiliary lubricating oil circuit; 22-Mechanical platform valve block; 23-fourth reversing valve; 24-first metering pump; 25-first filter element; 26-second one-way valve; 27-second metering pump; 28-second filter element; 29-high-speed motor; 30-throttle valve; 31-overflow valve; 32-pressure relief oil circuit; 33-first pressure sensor; 34-pressure measuring joint; 35-heater; 36-oil suction filter; 37-second pressure sensor; 38-return oil tank; 39-radiator; 40-breathing cap; 41-first clutch; 42-second clutch; 43-third clutch; 44-fourth clutch. Specific implementation method:

[0034] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] The four-speed transmission has four clutches, namely the first clutch, the second clutch, the third clutch and the fourth clutch, and the oil chambers corresponding to the four clutches are the K1 end oil chamber, the K2 end oil chamber, the K3 end oil chamber and the K4 end oil chamber of the clutch. When the transmission is working, the neutral gear is switched to the first gear, the first clutch and the fourth clutch are closed, the first gear is switched to the second gear, the first clutch and the third clutch are closed, the second gear is switched to the third gear, the second clutch and the fourth clutch are closed, the third gear is switched to the fourth gear, and the second clutch and the third clutch are closed.

[0037] like Figure 1As shown, a four-speed transmission control system of the present invention comprises a hydraulic valve block 1, an oil tank 2, an oil inlet circuit 3 and a lubricating oil circuit 4, wherein each oil outlet of the hydraulic valve block 1 is respectively connected to the oil chambers at the K1, K2, K3 and K4 ends of the clutch; the oil outlet end of the oil tank 2 is connected to the oil inlet of the hydraulic valve block 1 via the oil inlet circuit 3, and is used to supply oil to the oil chambers at each end of the clutch; the lubricating oil circuit 4 comprises a lubricating oil delivery main circuit 5 connected to the oil outlet end of the oil tank 2 at one end, and the other end of the lubricating oil delivery main circuit 5 is connected to a first supplementary oil circuit 6 and a lubricating oil delivery branch circuit 7 in parallel, and the lubricating oil delivery branch circuit is used to deliver lubricating oil to the transmission; the first supplementary oil circuit 6 is connected to the oil inlet circuit 3, and the oil in the lubricating oil circuit can be input into the oil inlet circuit through the first supplementary oil circuit, so that the two quantitative pumps work simultaneously to supply oil to the hydraulic valve block, ensuring that there is sufficient working pressure when the two clutch pistons work simultaneously (for example, switching from the second gear to the third gear), thereby ensuring smooth gear shifting.

[0038] In this embodiment, the hydraulic valve block 1 includes an oil inlet pipe 9 connected to the oil inlet circuit 3 on the main valve block 8, and the oil inlet pipe 9 leads to the oil inlets of the first proportional valve 11, the second proportional valve 12, and the third proportional valve 13 through the first check valve 10; the oil outlet of the first proportional valve 10 is connected to the oil inlet of the first reversing valve 14, the oil outlet of the second proportional valve 11 is connected to the oil inlet of the second reversing valve 15, the oil outlet of the third proportional valve 12 is connected to the oil inlet of the third reversing valve 16, and the oil outlet of the third reversing valve 16 is connected to the oil return ports of the first reversing valve 14 and the second reversing valve 15; the A\B ends of the first reversing valve 14 are connected to the K1 and K2 end oil chambers of the clutch through the first oil outlet filter 17, and the A\B ends of the second reversing valve 15 are connected to the K3 and K4 end oil chambers of the clutch through the second oil outlet filter 18; that is, each proportional valve controls the oil supply of two clutch oil chambers, and the two proportional valves control the pressure of four oil chambers. The third proportional valve is used to balance the pressure difference in the oil chamber when switching gears, and the third reversing valve is used to switch the pressure source of the balancing oil chamber.

[0039] In this embodiment, the first reversing valve 14 and the second reversing valve 15 are both three-position four-way electromagnetic reversing valves, and the third reversing valve 16 is a two-position three-way electromagnetic reversing valve.

[0040] In this embodiment, the lubricating oil delivery branch 7 is connected to a main lubricating oil circuit 19 for delivering lubricating oil to the transmission, and the main lubricating oil circuit 19 is connected to a second supplementary oil circuit 20, and the second supplementary oil circuit 20 is connected to the oil return port of the third reversing valve 16. The lubricating oil is delivered to the third reversing valve 16 through the second supplementary oil circuit 20, and the third reversing valve 16 delivers oil to the clutch pipeline, so that the oil with a certain pressure in the pipeline only needs to input oil with a lower pressure when the transmission is started, which greatly reduces the starting pressure of the transmission, improves the response speed, and shortens the response time. It should be noted that the main lubricating oil circuit can be connected to multiple lubricating pipelines.

[0041] In this embodiment, the lubricating oil delivery branch 7 is also connected to a secondary lubricating oil circuit 21 in parallel with the main lubricating oil circuit 19. The secondary lubricating oil circuit 21 is used to deliver lubricating oil to the mechanical platform valve block 22. The return oil port of the mechanical platform valve block 22 is connected back to the oil tank 2 via a hose.

[0042] In this embodiment, a fourth reversing valve 23 is installed on the lubricating oil delivery branch 7, and the fourth reversing valve 23 is used to control the on-off of the lubricating oil delivery branch.

[0043] In this embodiment, the oil inlet circuit 3 is provided with a first metering pump 24, two first filter elements 25 and a second one-way valve 26 in sequence along the delivery direction. The two first filter elements filter the oil output from the oil tank. The first metering pump delivers the oil output from the oil tank to the hydraulic valve block at a certain pressure to supply oil to the clutch.

[0044] In this embodiment, the lubricating oil delivery main path 5 is provided with a second metering pump 27 and two second filter elements 28 in sequence along the delivery direction.

[0045] In this embodiment, an oil circuit for supplying oil to the high-speed motor 29 is provided between the first constant-flow pump 24 and the second constant-flow pump 27 .

[0046] In this embodiment, a pressure relief oil circuit 32 composed of a throttle valve 30 and a relief valve 31 connected in series is provided beside the oil inlet circuit 3, and the pressure relief oil circuit 32 is respectively connected to the oil inlet circuit 3 and the oil tank 2. When maintenance is required, the oil inlet circuit is depressurized through the pressure relief oil circuit, and the reflux oil generated by the pressure relief flows back into the oil tank. Preferably, a pressure measuring joint 34 and a first pressure measuring sensor 33 are connected to the pressure relief oil circuit 32 for detecting the oil pressure.

[0047] In this embodiment, a heater 35 and an oil suction filter 36 are sequentially arranged at the oil outlet end of the oil tank 2 along the conveying direction, a radiator 39 is arranged inside the oil tank 2, and a breathable cap 40 is also arranged on the oil tank 2.

[0048] In this embodiment, the oil return ports of the first proportional valve 11 , the second proportional valve 12 and the third proportional valve 13 lead to the oil return tank 38 .

[0049] In this embodiment, a second pressure sensor is provided between the oil chambers at the K1, K2, K3, and K4 ends of the clutch and the reversing valve to detect the oil pressure.

[0050] The specific implementation process is carried out in the following steps:

[0051] Step S1: In the initial state, the first proportional valve 11, the second proportional valve 12, the third proportional valve 13, the first reversing valve 14, the second reversing valve 15 and the third reversing valve 16 are all de-energized;

[0052] Step S2, neutral gear is switched to first gear, and the first clutch and the fourth clutch are closed;

[0053] Step S21: The first proportional valve 11, the second proportional valve 12 and the third proportional valve 13 are all given a specified voltage, and the oil supply pressure of the first proportional valve 11 and the second proportional valve 12 is slightly greater than the oil pressure of the third proportional valve 13 through the transmission controller, and then the A end (Y1 end) of the first reversing valve 14 and the B end (Y4 end) of the second reversing valve 15 are respectively energized, and the third reversing valve and the fourth reversing valve are respectively energized; at this time, the first proportional valve 11 supplies oil to the K2 end oil chamber of the clutch, and the piston pushes to the K1 end oil chamber, and the first clutch begins to close, the second proportional valve 12 supplies oil to the K3 end oil chamber of the clutch, and the piston pushes to the K4 end oil chamber, and the fourth clutch begins to close; the third proportional valve 13 supplies oil to the K1 and K4 end oil chambers of the clutch through the third reversing valve 16 to balance the pressure difference of the oil chambers;

[0054] Step S22: During the closing process of the first clutch and the fourth clutch, the voltages of the first proportional valve 11, the second proportional valve 12 and the third proportional valve 13 are continuously adjusted to increase the pressure difference between the oil chamber at the K1 end and the oil chamber at the K2 end, and between the oil chamber at the K3 end and the oil chamber at the K4 end of the clutch, and finally reach a required pressure difference to completely close the first clutch and the fourth clutch, and then the third reversing valve, the fourth reversing valve and the third proportional valve are de-energized to complete the shifting process;

[0055] Step S3: switching from the first gear to the second gear, and closing the first clutch and the third clutch;

[0056] Step S31: The first proportional valve 11, the second proportional valve 12 and the third proportional valve 13 are all given a specified voltage, and the oil supply pressure of the first proportional valve 11 and the second proportional valve 12 is greater than the oil pressure of the third proportional valve 13. Then, the A end (Y1 end) of the first reversing valve 14 and the A end (Y3 end) of the second reversing valve 15 are energized respectively, and the third reversing valve and the fourth reversing valve are energized respectively; at this time, the first proportional valve 11 supplies oil to the K2 end oil chamber of the clutch, and the piston pushes to the K1 end oil chamber, and the first clutch begins to close; the second proportional valve 12 supplies oil to the K4 end oil chamber of the clutch, and the piston pushes to the K3 end oil chamber, and the third clutch begins to close; the third proportional valve 13 supplies oil to the K1 and K3 end oil chambers of the clutch through the third reversing valve 16 to balance the pressure difference of the oil chambers;

[0057] Step S32: During the closing process of the first clutch and K3, the voltages of the first proportional valve 11, the second proportional valve 12 and the third proportional valve 13 are continuously adjusted to increase the pressure difference between the oil chamber at the K1 end and the oil chamber at the K2 end, and between the oil chamber at the K3 end and the oil chamber at the K4 end of the clutch, and finally reach a required pressure difference to completely close the first clutch and the third clutch, and then the third reversing valve, the fourth reversing valve and the third proportional valve are de-energized to complete the shifting process;

[0058] Step S4, the second gear is switched to the third gear, and the second clutch and the fourth clutch are closed;

[0059] Step S41: The first proportional valve 11, the second proportional valve 12 and the third proportional valve 13 are all given a specified voltage, and the oil supply pressure of the first proportional valve 11 and the second proportional valve 12 is greater than the oil pressure of the third proportional valve 13. Then, the B end (Y2 end) of the first reversing valve 14 and the B end (Y4 end) of the second reversing valve 15 are respectively energized, and the third reversing valve and the fourth reversing valve are respectively energized; at this time, the first proportional valve 11 supplies oil to the K1 end oil chamber of the clutch, and the piston pushes to the K2 end oil chamber, and the second clutch begins to close; the second proportional valve 12 supplies oil to the K3 end oil chamber of the clutch, and the piston pushes to the K4 end oil chamber, and the fourth clutch begins to close; the third proportional valve 13 supplies oil to the K2 and K4 end oil chambers of the clutch through the third reversing valve 16 to balance the pressure difference of the oil chambers;

[0060] Step S42: During the closing process of the second clutch and the fourth clutch, the voltages of the first proportional valve 11, the second proportional valve 12 and the third proportional valve 13 are continuously adjusted to increase the pressure difference between the oil chamber at the K1 end and the oil chamber at the K2 end, and between the oil chamber at the K3 end and the oil chamber at the K4 end of the clutch, and finally reach a required pressure difference to completely close the second clutch and the fourth clutch, and then the third reversing valve, the fourth reversing valve and the third proportional valve are de-energized to complete the shifting process;

[0061] Step S5, the third gear is switched to the fourth gear, and the second clutch and the third clutch are closed;

[0062] Step S51: The first proportional valve 11, the second proportional valve 12 and the third proportional valve 13 are all given a specified voltage, and the oil supply pressure of the first proportional valve 11 and the second proportional valve 12 is greater than the oil pressure of the third proportional valve 13. Then, the B end (Y2 end) of the first reversing valve 14 and the A end (Y3 end) of the second reversing valve 15 are energized respectively, and the third reversing valve and the fourth reversing valve are energized respectively; at this time, the first proportional valve 11 supplies oil to the K1 end oil chamber of the clutch, and the piston pushes to the K2 end oil chamber, and the second clutch begins to close; the second proportional valve 12 supplies oil to the K4 end oil chamber of the clutch, and the piston pushes to the K3 end oil chamber, and the third clutch begins to close; the third proportional valve 13 supplies oil to the K2 and K3 end oil chambers of the clutch through the third reversing valve 16 to balance the pressure difference of the oil chambers;

[0063] Step S52: During the closing process of the second clutch and the third clutch, the voltages of the first proportional valve 11, the second proportional valve 12 and the third proportional valve 13 are continuously adjusted to increase the pressure difference between the oil chamber at the K1 end and the oil chamber at the K2 end, and between the oil chamber at the K3 end and the oil chamber at the K4 end of the clutch, and finally reach a required pressure difference to completely close the second clutch and the third clutch, and then the third reversing valve, the fourth reversing valve and the third proportional valve are de-energized to complete the shifting process;

[0064] Step S6: When reversing, just shift the transmission into a suitable gear and reverse the motor.

[0065] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integrated molding using a casting process) (except when it is obviously impossible to use an integrated molding process).

[0066] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0067] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A four-speed transmission control system, characterized in that: It includes a hydraulic valve block, an oil tank, an oil inlet circuit and a lubricating oil circuit. The oil outlets of the hydraulic valve block are respectively connected to the oil chambers at the K1, K2, K3 and K4 ends of the clutch; the oil outlet end of the oil tank is connected to the oil inlet of the hydraulic valve block via the oil inlet circuit; the lubricating oil circuit includes a lubricating oil delivery main circuit connected to the oil outlet end of the oil tank at one end, and the other end of the lubricating oil delivery main circuit is connected to a first supplementary oil circuit and a lubricating oil delivery branch circuit in parallel, and the first supplementary oil circuit is connected to the oil inlet circuit; the hydraulic valve block includes a main valve block The oil inlet pipe connected to the oil inlet circuit leads to the oil inlet ports of the first proportional valve and the second proportional valve respectively through the first one-way valve; the oil outlet of the first proportional valve is connected to the oil inlet port of the first reversing valve, and the oil outlet of the second proportional valve is connected to the oil inlet port of the second reversing valve; the A\B ends of the first reversing valve are connected to the oil chambers of the K1 and K2 ends of the clutch respectively through the first oil outlet filter element, and the A\B ends of the second reversing valve are connected to the oil chambers of the K3 and K4 ends of the clutch respectively through the second oil outlet filter element; the first reversing valve and the second reversing valve both adopt three-position four-way electromagnetic reversing valves.

2. A four-speed transmission control system according to claim 1, characterized in that: The hydraulic valve block also includes a third proportional valve and a third reversing valve. The oil inlet of the third proportional valve is connected to the oil inlet pipe, the oil outlet of the third proportional valve is connected to the oil inlet of the third reversing valve, the oil outlet of the third reversing valve is connected to the oil return ports of the first reversing valve and the second reversing valve, and the third reversing valve adopts a two-position three-way electromagnetic reversing valve.

3. A four-speed transmission control system according to claim 2, characterized in that: The lubricating oil delivery branch is connected to a main lubricating oil circuit, the main lubricating oil circuit is connected to a second supplementary oil circuit, and the second supplementary oil circuit is connected to an oil return port of a third reversing valve.

4. A four-speed transmission control system according to claim 3, characterized in that: The lubricating oil delivery branch is also connected to a secondary lubricating oil circuit in parallel with the main lubricating oil circuit, and the secondary lubricating oil circuit is used to deliver lubricating oil to the mechanical platform valve block.

5. A four-speed transmission control system according to claim 1 or 3, characterized in that: A fourth reversing valve is installed on the lubricating oil delivery branch, and the fourth reversing valve is used to control the on-off of the lubricating oil delivery branch.

6. A four-speed transmission control system according to claim 1, characterized in that: The oil inlet circuit is provided with a first metering pump, at least one first filter element and a second one-way valve in sequence along the delivery direction; the lubricating oil delivery main circuit is provided with a second metering pump and at least one second filter element in sequence along the delivery direction, and an oil circuit for supplying oil to the high-speed motor is provided between the first metering pump and the second metering pump.

7. A four-speed transmission control system according to claim 1, characterized in that: A pressure relief oil circuit consisting of a throttle valve and a relief valve connected in series is arranged beside the oil inlet circuit, and the pressure relief oil circuit is connected to the oil inlet circuit and the oil tank respectively.

8. A four-speed transmission control system according to claim 1, characterized in that: The oil outlet end of the oil tank is provided with a heater and an oil suction filter in sequence along the conveying direction, and a radiator is provided in the oil tank.

9. A working method of a four-speed transmission control system, characterized in that: The invention comprises adopting a four-speed transmission control system as claimed in claim 3, wherein the clutches of the four-speed transmission are respectively a first clutch, a second clutch, a third clutch and a fourth clutch, and performing the following steps: Step S1: In the initial state, the first proportional valve, the second proportional valve, the third proportional valve, the first reversing valve, the second reversing valve and the third reversing valve are all de-energized; Step S2, neutral gear is switched to first gear, and the first clutch and the fourth clutch are closed; Step S21: The first proportional valve, the second proportional valve and the third proportional valve are all given a specified voltage, and the oil supply pressure of the first proportional valve and the second proportional valve is greater than the oil pressure of the third proportional valve. Then, the A end of the first reversing valve and the B end of the second reversing valve are energized respectively, and the third reversing valve and the fourth reversing valve are energized respectively; at this time, the first proportional valve supplies oil to the K2 end oil chamber of the clutch, and the piston pushes to the K1 end oil chamber, and the first clutch begins to close; the second proportional valve supplies oil to the K3 end oil chamber of the clutch, and the piston pushes to the K4 end oil chamber, and the fourth clutch begins to close; the third proportional valve supplies oil to the K1 and K4 end oil chambers of the clutch through the third reversing valve; Step S22: continuously adjusting the voltages of the first proportional valve, the second proportional valve, and the third proportional valve, so that the pressure difference between the oil chamber at the K1 end and the oil chamber at the K2 end, and between the oil chamber at the K3 end and the oil chamber at the K4 end of the clutch becomes larger and larger, until the first clutch and the fourth clutch are completely closed, and then the third reversing valve, the fourth reversing valve, and the third proportional valve lose power, completing the shifting process; Step S3: switching from the first gear to the second gear, and closing the first clutch and the third clutch; Step S31: The first proportional valve, the second proportional valve and the third proportional valve are all given a specified voltage, and the oil supply pressure of the first proportional valve and the second proportional valve is greater than the oil pressure of the third proportional valve. Then, the A end of the first reversing valve and the A end of the second reversing valve are energized respectively, and the third reversing valve and the fourth reversing valve are energized respectively; at this time, the first proportional valve supplies oil to the K2 end oil chamber of the clutch, and the piston pushes to the K1 end oil chamber, and the first clutch begins to close; the second proportional valve supplies oil to the K4 end oil chamber of the clutch, and the piston pushes to the K3 end oil chamber, and the third clutch begins to close; the third proportional valve supplies oil to the K1 and K3 end oil chambers of the clutch through the third reversing valve; Step S32: continuously adjusting the voltages of the first proportional valve, the second proportional valve, and the third proportional valve, so that the pressure difference between the oil chamber at the K1 end and the oil chamber at the K2 end, and between the oil chamber at the K3 end and the oil chamber at the K4 end of the clutch becomes larger and larger, until the first clutch and the third clutch are completely closed, and then the third reversing valve, the fourth reversing valve, and the third proportional valve lose power, completing the shifting process; Step S4, the second gear is switched to the third gear, and the second clutch and the fourth clutch are closed; Step S41: The first proportional valve, the second proportional valve and the third proportional valve are all given a specified voltage, and the oil supply pressure of the first proportional valve and the second proportional valve is greater than the oil pressure of the third proportional valve. Then, the B end of the first reversing valve and the B end of the second reversing valve are energized respectively, and the third reversing valve and the fourth reversing valve are energized respectively; at this time, the first proportional valve supplies oil to the K1 end oil chamber of the clutch, the piston pushes to the K2 end oil chamber, and the second clutch begins to close, the second proportional valve supplies oil to the K3 end oil chamber of the clutch, the piston pushes to the K4 end oil chamber, and the fourth clutch begins to close; the third proportional valve supplies oil to the K2 and K4 end oil chambers of the clutch through the third reversing valve; Step S42: continuously adjusting the voltages of the first proportional valve, the second proportional valve, and the third proportional valve, so that the pressure difference between the oil chamber at the K1 end and the oil chamber at the K2 end, and between the oil chamber at the K3 end and the oil chamber at the K4 end of the clutch becomes larger and larger, until the second clutch and the fourth clutch are completely closed, and then the third reversing valve, the fourth reversing valve, and the third proportional valve lose power, completing the shifting process; Step S5, the third gear is switched to the fourth gear, and the second clutch and the third clutch are closed; Step S51: The first proportional valve, the second proportional valve and the third proportional valve are all given a specified voltage, and the oil supply pressure of the first proportional valve and the second proportional valve is greater than the oil pressure of the third proportional valve. Then, the B end of the first reversing valve and the A end of the second reversing valve are energized respectively, and the third reversing valve and the fourth reversing valve are energized respectively; at this time, the first proportional valve supplies oil to the K1 end oil chamber of the clutch, the piston pushes to the K2 end oil chamber, and the second clutch begins to close; the second proportional valve supplies oil to the K4 end oil chamber of the clutch, the piston pushes to the K3 end oil chamber, and the third clutch begins to close; the third proportional valve supplies oil to the K2 and K3 end oil chambers of the clutch through the third reversing valve; Step S52: Continuously adjust the voltages of the first proportional valve, the second proportional valve and the third proportional valve to increase the pressure difference between the oil chamber at the K1 end and the oil chamber at the K2 end, and between the oil chamber at the K3 end and the oil chamber at the K4 end of the clutch until the second clutch and the third clutch are completely closed, and then the third reversing valve, the fourth reversing valve and the third proportional valve lose power to complete the shifting process.

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