CN204312689U - The shifting control system of automatic transmission - Google Patents

Abstract

A shift control system of an automatic transmission, the first gear switching valve has four pressure output ports, a first control terminal and a second control terminal; the second gear switching valve has four pressure output ports and a first control terminal and the second control end; the odd-even selection valve has a first pressure output port, a second pressure output port, a first control end and a second control end, the first pressure output port and the first control end of the first gear switching valve and The first control end of the second gear switching valve is connected, and the second pressure output port is connected with the second control end of the first gear switching valve and the second control end of the second gear switching valve; The pressure output port is connected to the first control end of the odd-even selection valve; the pressure output port of the second clutch solenoid valve is connected to the second control end of the odd-even selection valve; the four pressure output ports of the first gear switching valve and the second gear The four pressure output ports of the position switching valve are connected with the four shift oil cylinders.

Description

Shift Control System of Automatic Transmission

technical field

The utility model relates to the technical field of automatic transmissions of automobiles, in particular to a shift control system of automatic transmissions.

Background technique

With the advancement of science and technology, the way automobiles realize shifting has gradually evolved from manual shifting to automatic shifting, and automatic shifting is realized through automatic transmissions. Among them, the dual-clutch automatic transmission has been welcomed by the market due to its advantages such as high transmission efficiency. Two clutches are used in the dual-clutch automatic transmission, one of which is used to control odd-numbered gears, and the other is used to control even-numbered gears. , by automatically switching between the two clutches to complete the shift program, so the power shift during the shift process can be realized, that is, the power is not interrupted during the shift process, and the comfort of the vehicle is improved.

When the automatic transmission realizes automatic shifting, it needs a shift actuator, a system component, whose function is to realize the automatic shift function. At present, hydraulic shift actuators are mostly used. Gear shifting is generally accomplished by a synchronizer keyed to the relevant shaft and rotated therewith. Gears with different transmission ratios are provided on one or both sides of the synchronizer. Under the action of the shift actuator, the synchronizer is The toggle moves axially and engages adjacent gears, coupling the gears to the shaft and synchronizing the gears with the shaft for power output.

The current automatic transmission mostly adopts eight gears (including reverse gear), and utilizes the shift control system to control the shift actuator to complete the shift operation of the eight gears. In the prior art, when the clutches of the odd gears (or even gears) cannot be operated, the operation of the odd gears (or even gears) is prohibited, so that misoperation may occur when the transmission is running and the transmission may be damaged.

Utility model content

The purpose of this utility model is to provide a gear shift control system of an automatic transmission, so that when the clutch of an odd gear (or an even gear) is working, the operation of the odd gear (or even gear) is prohibited, thereby avoiding erroneous damage to the automatic transmission.

The embodiment of the utility model provides a shift control system of an automatic transmission, including a main pump and four shift oil cylinders, and the shift control system also includes:

The first gear switching valve, the first gear switching valve has two pressure input ports, four pressure output ports, a first control end and a second control end, the first control end and the second control end of the first gear switching valve The second control end is respectively located at both ends of the first gear switching valve. The first gear switching valve can be switched between the first working position and the second working position. The first gear switching valve is in the first working position. position, the two pressure input ports of the first gear switching valve respectively communicate with two of the four pressure output ports of the first gear switching valve, and the first gear switching valve is in the second In the working position, the two pressure input ports of the first gear switching valve communicate with the other two pressure output ports of the four pressure output ports of the first gear switching valve;

The second gear switching valve, the second gear switching valve has two pressure input ports, four pressure output ports, a first control end and a second control end, the first control end and the second control end of the second gear switching valve The second control ports are respectively located at both ends of the second gear switching valve. The second gear switching valve can be switched between the first working position and the second working position. The second gear switching valve is in the first working position. position, the two pressure input ports of the second gear switching valve respectively communicate with two of the four pressure output ports of the second gear switching valve, and the second gear switching valve is in the second In the working position, the two pressure input ports of the second gear switching valve communicate with the other two pressure output ports of the four pressure output ports of the second gear switching valve;

An odd-even selection valve, the odd-even selection valve has a pressure input port, a first pressure output port, a second pressure output port, a first control port, and a second control port, and the first control port and the second control port of the odd-even selection valve are respectively Located at both ends of the odd-even selection valve, the first pressure output port of the odd-even selection valve is connected to the first control end of the first gear switching valve and the first control end of the second gear switching valve. The second pressure output port of the valve is connected with the second control end of the first gear switching valve and the second control end of the second gear switching valve; the odd-even selection valve can be in the first working position and the second working position When the odd-even selection valve is in the first working position, the pressure input port of the odd-even selection valve communicates with the first pressure output port of the odd-even selection valve. When the odd-even selection valve is in the second working position, the odd-even selection valve The pressure input port of the valve communicates with the second pressure output port of the odd-even selection valve;

The first clutch solenoid valve, the first clutch solenoid valve is used to control the engagement of the first clutch, the first clutch solenoid valve has a pressure input port and a pressure output port, the pressure output port of the first clutch solenoid valve is connected to the odd-even selection The first control end of the valve is connected;

The second clutch electromagnetic valve, the second clutch electromagnetic valve is used to control the engagement of the second clutch, the second clutch electromagnetic valve has a pressure input port and a pressure output port, the pressure output port of the second clutch electromagnetic valve is connected to the odd-even selection The second control end of the valve is connected;

Wherein, the four pressure output ports of the first gear switching valve are connected with two of the four shifting oil cylinders, and the four pressure output ports of the second gear switching valve are connected with the four shifting oil cylinders. The other two shift cylinders in the gear cylinder are connected.

In the embodiment of the utility model, by controlling the first gear switching valve, the second gear switching valve, the odd-even selection valve, the first clutch solenoid valve, and the second clutch solenoid valve in the shift control system, the When the clutches of odd gears (or even gears) are working, it is prohibited to operate the odd gears (or even gears), so as to avoid damage to the automatic transmission due to misoperation, and improve system safety and robustness.

The above description is only an overview of the technical solutions of the present utility model. In order to better understand the technical means of the present utility model, it can be implemented according to the contents of the description, and in order to make the above-mentioned and other purposes, features and advantages of the present utility model better It is obvious and easy to understand. The preferred embodiments are specifically cited below, together with the accompanying drawings, and detailed descriptions are as follows.

Description of drawings

Fig. 1 is a schematic diagram of the principle of the shift control system of the automatic transmission in the embodiment of the utility model.

Detailed ways

In order to further explain the technical means and effects of the utility model to achieve the intended purpose of the utility model, the utility model will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

Fig. 1 is a schematic diagram of the principle of the shift control system of the automatic transmission in the embodiment of the present invention, please refer to Fig. 1, the shift control system is used in the automatic transmission of automobiles, especially in the dual-clutch automatic transmission, the shift control system Including main pump 11, gear shift control valve 12, first gear switching valve 13, second gear switching valve 14, first gear switching valve 15, second gear switching valve 16, odd-even selection valve 17, first Clutch solenoid valve 18, second clutch solenoid valve 19.

The main pump 11 sucks oil from the oil tank 22 through the oil suction filter 21 , so as to provide the pressure oil required for the shift control system to work. In this embodiment, the main pump 11 is driven by the internal combustion engine of the automobile. The gear shift control system is also provided with an auxiliary pump 23. The auxiliary pump 23 is driven by a motor. The main pump 11 is assisted in the case, and on the other hand, the supply of pressurized oil in the system can be ensured in the case of a stop of the internal combustion engine and thus of the main pump 11. The auxiliary pump 23 also sucks oil from the oil tank 22 via the oil suction filter 21 . Tank symbols are used in various places in FIG. 1 , and these tank symbols are understood to communicate to tank 22 through associated lines.

In order to prevent the reverse flow of oil, the output port of the main pump 11 is connected with a main pump check valve 24. It acts on the control end of the main pump check valve 24 to resist the spring arranged at the spring end. Only when the output pressure of the main pump 11 is sufficient to overcome the spring force, the main pump check valve 24 is switched from the closed position shown in FIG. 1 to In the open position, that is to say, the main pump check valve 24 disconnects the main pump 11 from the rest of the shift control system as long as the main pump 11 has not built up sufficient pressure. The main pump check valve 24 is used to prevent oil from flowing toward the main pump 11 on the one hand, and is used to ensure the necessary starting characteristics of the main pump 11 on the other hand. Understandably, the main pump one-way valve 24 can also be a common one-way valve.

In order to control the maximum pressure in the system, the output port of the main pump check valve 24 is also connected with a system safety valve 25, and the system safety valve 25 can be a safety overflow valve or a common check valve. In this embodiment, the system safety valve 25 It is an ordinary check valve, which is connected between the output port of the main pump check valve 24 and the oil tank 22, the oil inlet of the check valve is connected with the output port of the main pump check valve 24, and the oil outlet of the check valve The port is connected with the oil tank 22, and the maximum pressure allowed in the system is set through the check valve. When the pressure in the system exceeds the maximum pressure, the check valve opens to drain oil.

The shift control valve 12 has a pressure input port 121 and two pressure output ports 122, 123 (hereinafter referred to as the first pressure output port 122 and the second pressure output port 123). The pump check valve 24 is connected with the main pump 11 . The shift control valve 12 can be switched between the first working position and the second working position. When the shift control valve 12 is in the first working position, the pressure input port 121 and one of the two pressure output ports 122 and 123 When the shift control valve 12 is in the second working position, the pressure input port 121 communicates with the other of the two pressure output ports 122 , 123 . In this embodiment, when the shift control valve 12 is in the first working position (the left position as shown in FIG. 1 ), the pressure input port 121 communicates with the first pressure output port 122, and the second pressure output port 123 communicates with the fuel tank 22. Communication; when the shift control valve 12 is switched to the second working position (the right position as shown in Figure 1), the pressure input port 121 communicates with the second pressure output port 123, and the first pressure output port 122 communicates with the oil tank 22 . That is to say, by changing the working position of the shift control valve 12 , the pressure oil from the main pump 11 can be selectively guided to one of the two pressure output ports 122 , 123 .

The shift control valve 12 may be a spool type electromagnetic directional valve or a hydraulic control directional valve. When the shift control valve 12 is an electromagnetic reversing valve, the reversing operation of the shift control valve 12 can be realized through simple power-on and power-off. When performing shifting operations in different gears, the required shifting pressure is usually different. In order to realize that the shifting pressure output by the two pressure output ports 122 and 123 can meet the shifting requirements in different gears, this In the embodiment, the shift control valve 12 adopts a spool type hydraulic control proportional directional valve, the shift control system also includes a shift pressure solenoid valve 26, the pressure output port of the shift pressure solenoid valve 26 and the shift control valve 12 is connected to the control end, when the shift pressure solenoid valve 26 is opened, the control pressure output by the shift pressure solenoid valve 26 acts on the control end of the shift control valve 12 to push the shift control valve 12 to perform the reversing operation; in addition , the two pressure output ports 122 and 123 of the shift control valve 12 respectively apply pressure feedback to both ends of the shift control valve 12 to realize the two pressure outputs of the shift control valve 12 through the shift pressure solenoid valve 26 Ports 122 and 123 output different shift pressures under different shift demands.

The first gear switching valve 13 has two pressure input ports 131, 132 (hereinafter referred to as the first pressure input port 131 and the second pressure input port 132) and four pressure output ports 133, 134, 135, 136 (hereinafter referred to as are the first pressure output port 133, the second pressure output port 134, the third pressure output port 135 and the fourth pressure output port 136). The first gear switching valve 13 can be switched between the first working position and the second working position. When the first gear switching valve 13 is in the first working position, the two pressure input ports 131, 132 are connected with the four pressure output ports respectively. Two of the pressure output ports of ports 133, 134, 135, and 136 are connected. When the first gear switching valve 13 is in the second working position, the two pressure input ports 131, 132 are respectively connected to the four pressure output ports 133, 134. , The other two pressure outlets in 135 and 136 are connected. In this embodiment, when the first gear switching valve 13 is in the first working position (left position as shown in FIG. 1 ), the two pressure input ports 131, 132 are respectively connected to the first pressure output port 133 and the third pressure The output port 135 is connected, and the second pressure output port 134 and the fourth pressure output port 136 are connected to the oil tank 22; The two pressure input ports 131 , 132 communicate with the second pressure output port 134 and the fourth pressure output port 136 respectively, while the first pressure output port 133 and the third pressure output port 135 communicate with the oil tank 22 . That is to say, by changing the working position of the first gear switching valve 13, the first pressure input port 131 can be selectively communicated with the first pressure output port 133 or the second pressure output port 134, and the second pressure output port 131 can be selectively connected. The second pressure input port 132 communicates with the third pressure output port 135 or the fourth pressure output port 136 .

The second gear switching valve 14 has two pressure input ports 141, 142 (hereinafter referred to as the first pressure input port 141 and the second pressure input port 142) and four pressure output ports 143, 144, 145, 146 (hereinafter referred to as are the first pressure output port 143, the second pressure output port 144, the third pressure output port 145 and the fourth pressure output port 146). The second gear switching valve 14 can be switched between the first working position and the second working position. When the second gear switching valve 14 is in the first working position, the two pressure input ports 141, 142 are connected with the four pressure output ports respectively. Two of the pressure output ports in the ports 143, 144, 145, and 146 are connected. When the second gear switching valve 14 is in the second working position, the two pressure input ports 141, 142 are respectively connected to the four pressure output ports 143, 144. , The other two pressure outlets in 145 and 146 are connected. In this embodiment, when the second gear switching valve 14 is in the first working position (right position as shown in FIG. 1 ), the two pressure input ports 141, 142 are respectively connected to the first pressure output port 143 and the third pressure The output port 145 is connected, and the second pressure output port 144 and the fourth pressure output port 146 are connected to the oil tank 22; The two pressure input ports 141 , 142 communicate with the second pressure output port 144 and the fourth pressure output port 146 respectively, while the first pressure output port 143 and the third pressure output port 145 communicate with the oil tank 22 . That is to say, by changing the working position of the second gear switching valve 14, the first pressure input port 141 can be selectively communicated with the first pressure output port 143 or the second pressure output port 144, and the second pressure output port 141 can be selectively connected The second pressure input port 142 communicates with the third pressure output port 145 or the fourth pressure output port 146 .

The first gear switch valve 15 is connected between the first gear switch valve 13 and the shift control valve 12, the first gear switch valve 15 can switch between the closed position and the open position, the first gear switch valve 15 When it is in the closed position, the two pressure output ports 122, 123 of the shift control valve 12 are respectively disconnected from the two pressure input ports 131, 132 of the first gear switching valve 13; the first gear switching valve 15 is in the open position , the two pressure output ports 122 and 123 of the shift control valve 12 communicate with the two pressure input ports 131 and 132 of the first gear switching valve 13 respectively. In this embodiment, when the first gear switch valve 15 is in the closed position (left position as shown in FIG. is blocked, the two pressure input ports 131, 132 of the first gear switch valve 13 are connected to the fuel tank 22 via the first gear switch valve 15, so that the two pressure output ports 122, 123 of the shift control valve 12 are connected to the first The two pressure input ports 131, 132 of the gear switch valve 13 are disconnected; when the first gear switch valve 15 is in the open position (the right position as shown in Figure 1), the two The pressure output ports 122 , 123 communicate with the two pressure input ports 131 , 132 of the first gear switching valve 13 respectively.

The second gear switching valve 16 is connected between the second gear switching valve 14 and the shift control valve 12, the second gear switching valve 16 can be switched between a closed position and an open position, and the second gear switching valve 16 When it is in the closed position, the two pressure output ports 122, 123 of the shift control valve 12 are respectively disconnected from the two pressure input ports 141, 142 of the second gear switching valve 14; the second gear switching valve 16 is in the open position , the two pressure output ports 122 and 123 of the shift control valve 12 communicate with the two pressure input ports 141 and 142 of the second gear switching valve 14 respectively. In this embodiment, when the second gear switch valve 16 is in the closed position (right position as shown in FIG. is blocked, the two pressure input ports 141, 142 of the second gear switch valve 14 are connected to the oil tank 22 through the second gear switch valve 16, so that the two pressure output ports 122, 123 of the shift control valve 12 are connected to the second The two pressure input ports 141, 142 of the gear switching valve 14 are disconnected; when the second gear switching valve 16 is in the open position (left position as shown in FIG. The pressure output ports 122 , 123 communicate with the two pressure input ports 141 , 142 of the second gear switching valve 14 respectively.

The first gear switching valve 15 and the second gear switching valve 16 may specifically be spool type electromagnetic directional valves or hydraulic control directional valves. When the first gear switching valve 15 and the second gear switching valve 16 adopt electromagnetic reversing valves, the switching of the first gear switching valve 15 and the second gear switching valve 16 can be realized through simple power-on and power-off. commutation operation. In this embodiment, both the first gear switching valve 15 and the second gear switching valve 16 are spool type hydraulic control valves, and the shift control system also includes a first gear solenoid valve 27 and a second gear solenoid valve 27. The first gear solenoid valve 28, the first gear solenoid valve 27 and the second gear solenoid valve 28 can specifically be proportional solenoid valves, the first gear solenoid valve 27 can output adjustable first gear control pressure, and the second gear solenoid valve 27 can output an adjustable first gear control pressure. The solenoid valve 28 can output an adjustable second gear control pressure, wherein the first gear control pressure acts on the opening end 151 of the first gear switching valve 15 and the closing end 162 of the second gear switching valve 16, the The second gear control pressure acts on the open end 161 of the second gear switching valve 16 and the closing end 152 of the first gear switching valve 15, whereby the two gear switching valves 15, 16 can pass through the first gear. When the first gear control pressure and the second gear control pressure realize reversing, they can also realize interlocking, which improves the safety of the system, that is, when the first gear control pressure output by the first gear solenoid valve 27 makes the first gear When the switch valve 15 is in the open state, the first gear control pressure will simultaneously make the second gear switch valve 16 in the closed state; when the second gear control pressure output by the second gear solenoid valve 28 makes the second gear When the first gear switch valve 16 is in the open state, the second gear control pressure will simultaneously make the first gear switch valve 15 in the closed state. In addition, the closing end 152 of the first gear switching valve 15 and the closing end 162 of the second gear switching valve 16 are respectively provided with springs to provide the reset of the two gear switching valves 15, 16 after the shutdown by using the springs. Function.

The first gear switching valve 13 and the second gear switching valve 14 may specifically be spool type electromagnetic directional valves or hydraulic control directional valves. When the first gear switching valve 13 and the second gear switching valve 14 adopt electromagnetic reversing valves, the switching of the first gear switching valve 13 and the second gear switching valve 14 can be realized through simple power-on and power-off. commutation operation. In this embodiment, both the first gear switching valve 13 and the second gear switching valve 14 are spool type hydraulic control valves, and the first gear switching valve 13 also has a first control port 137 and a second control port 137. end 138, the first control end 137 and the second control end 138 are respectively located at the two ends of the first gear switching valve 13, the second gear switching valve 14 also has a first control end 147 and a second control end 148, the first The control terminal 147 and the second control terminal 148 are respectively located at two ends of the second gear switching valve 14 . The first control end 137 of the first gear switching valve 13 is connected to the first control end 147 of the second gear switching valve 14 and connected to a control oil circuit, and the second control end 138 of the first gear switching valve 13 is connected to the first control end 147 of the second gear switching valve 14. The second control end 148 of the second gear switching valve 14 is connected to another control oil circuit.

The shift control system also includes four shift cylinders 41, 42, 43, 44 (hereinafter referred to as the first shift cylinder 41, the second shift cylinder 42, the third shift cylinder 43 and the fourth shift cylinder 44) ). The four pressure output ports 133, 134, 135, 136 of the first gear switching valve 13 are connected to two of the four shifting oil cylinders 41, 42, 43, 44, and the second gear switching valve 14 The four pressure output ports 143, 144, 145, 146 are connected with the other two shift oil cylinders in the four shift oil cylinders 41, 42, 43, 44. In this embodiment, the four pressure output ports 133, 134, 135, and 136 of the first gear switching valve 13 are connected to the first shift oil cylinder 41 and the second shift oil cylinder 42, and the four pressure output ports 133, 134, 135, 136 of the second gear switching valve 14 A pressure output port 143 , 144 , 145 , 146 is connected with the third shift oil cylinder 43 and the fourth shift oil cylinder 44 . The first pressure output port 133 and the third pressure output port 135 of the first gear switching valve 13 are connected to the two ends of the first shift oil cylinder 41 respectively, and the second pressure output port 134 and the second pressure output port 134 of the first gear switching valve 13 The four pressure output ports 136 are respectively connected to both ends of the second shift cylinder 42, and the first pressure output port 143 and the third pressure output port 145 of the second gear switching valve 14 are respectively connected to two ends of the third shift cylinder 43. The second pressure output port 144 and the fourth pressure output port 146 of the second gear switching valve 14 are respectively connected to both ends of the fourth gear shift cylinder 44 . Each gear shift cylinder is used to drive a corresponding shift fork to move to realize the shifting or removal of two gears. For example, the first gear shift cylinder 41 is used to control the third gear and the seventh gear, and the second gear shift The gear oil cylinder 42 is used to control the reverse gear and the sixth gear, the third gear shift oil cylinder 43 is used to control the first gear and the fifth gear, and the fourth gear shift oil cylinder 44 is used to control the second gear and the fourth gear. The shift control valve 12, the first gear switch valve 13, the second gear switch valve 14, the first gear switch valve 15 and the second gear switch valve 16 in the gear shift control system are controlled to realize the The automatic shifting function of the automatic transmission with eight speeds (seven forward gears and one reverse gear) greatly simplifies the number of components in the system, making it possible to achieve automatic transmission with as few control slide valves and solenoid valves as possible. The shift control and safety control functions of the transmission make the system simpler and the control more efficient.

The odd-even selection valve 17 has a pressure input port 171, a first pressure output port 172 and a second pressure output port 173, the first pressure output port 172 is connected to the first control port 137 of the first gear switching valve 13 and the second gear switching The first control end 147 of the valve 14 is connected, and the second pressure output port 173 is connected with the second control end 138 of the first gear switching valve 13 and the second control end 148 of the second gear switching valve 14 . The odd-even selection valve 17 can be switched between the first working position and the second working position. When the odd-even selection valve 17 is in the first working position, the pressure input port 171 communicates with the first pressure output port 172, and the odd-even selection valve 17 is in the second working position. In the working position, the pressure input port 171 communicates with the second pressure output port 173 . In this embodiment, when the odd-even selector valve 17 is in the first working position (the right position as shown in FIG. 1 ), the pressure input port 171 communicates with the first pressure output port 172, and the second pressure output port 173 communicates with the oil tank 22. ; When the odd-even selector valve 17 is switched to the second working position (left position as shown in Figure 1), the pressure input port 171 communicates with the second pressure output port 173, and the first pressure output port 172 communicates with the oil tank 22.

In this embodiment, the odd-even selector valve 17 is a spool type hydraulic control reversing valve, and the two ends of the odd-even selector valve 17 respectively have a first control terminal 175 and a second control terminal 176, and the first clutch solenoid valve 18 has a pressure input Port 181 and pressure output port 182 , the pressure output port 182 of the first clutch solenoid valve 18 is connected with the first control port 175 of the odd-even selection valve 17 . When the first clutch solenoid valve 18 is opened, the pressure input port 181 communicates with the pressure output port 182, and the control pressure output by the first clutch solenoid valve 18 acts on the first control port 175 of the odd-even selector valve 17 to push the odd-even selector valve 17 to change direction. Make it in the second working position (left position as shown in Figure 1).

The second clutch solenoid valve 19 has a pressure input port 191 and a pressure output port 192 , and the pressure output port 192 of the second clutch solenoid valve 19 is connected with the second control end 176 of the odd-even selection valve 17 . When the second clutch solenoid valve 19 is opened, the pressure input port 191 communicates with the pressure output port 192, and the control pressure output by the second clutch solenoid valve 19 acts on the second control end 176 of the odd-even selector valve 17 to push the odd-even selector valve 17 to change direction. Make it in the first working position (the right position as shown in Figure 1). Wherein, the first clutch solenoid valve 18 is used to control the engagement of the first clutch (not shown), the second clutch solenoid valve 19 is used to control the engagement of the second clutch (not shown), and the pressure input port of the odd-even selection valve 17 171 . Both the pressure input port 181 of the first clutch solenoid valve 18 and the pressure input port 191 of the second clutch solenoid valve 19 are connected to the main pump 11 .

When the first clutch electromagnetic valve 18 is opened, the odd-even selector valve 17 will be in the second working position (left position as shown in Figure 1), and the pressure input port 171 of the odd-even selector valve 17 is connected to the second pressure output port 173 at this moment. The odd-even selector valve 17 applies control pressure to the second control end 138 of the first gear switching valve 13 and the second control end 148 of the second gear switching valve 14 at the same time, so that the first gear switching valve 13 switches to The second working position (the right position as shown in Figure 1 ), so that the first pressure input port 131 and the second pressure input port 132 of the first gear switching valve 13 can only be connected with the second pressure output port 134 and the fourth pressure port. The output port 136 is connected, and at the same time, the second gear switching valve 14 is switched to the second working position (left position as shown in FIG. 1 ), so that the first pressure input port 141 of the second gear switching valve 14 and the first pressure input port 141 The second pressure input port 142 can only communicate with the second pressure output port 144 and the fourth pressure output port 146 . When the first clutch electromagnetic valve 18 is opened, the first clutch controlling the odd gears is in the engaged working state, and the dual-clutch automatic transmission is working in the odd gears, so the next gear to be engaged is an even gear. Therefore, through appropriate gear design, for example, the second shift cylinder 42 connected to the second pressure output port 134 and the fourth pressure output port 136 of the first gear switching valve 13 and the second gear switching valve The second pressure output port 144 of 14 and the fourth shift oil cylinder 44 connected to the fourth pressure output port 146 are all designed to control the even gears, then when the first clutch solenoid valve 18 is opened, the first gear switch valve 13 and the second gear switching valve 14 can only be hung into even gears, so that when the first clutch of odd gears works, the operation of odd gears is prohibited.

When the second clutch solenoid valve 19 is opened, the odd-even selector valve 17 will be in the first working position (the right position as shown in Figure 1), and the pressure input port 171 of the odd-even selector valve 17 is connected to the first pressure output port 172 at this moment. The odd-even selector valve 17 applies control pressure to the first control end 137 of the first gear switching valve 13 and the first control end 147 of the second gear switching valve 14 at the same time, so that the first gear switching valve 13 switches to The first working position (the left position as shown in Figure 1 ), so that the first pressure input port 131 and the second pressure input port 132 of the first gear switching valve 13 can only be connected with the first pressure output port 133 and the third pressure port. The output port 135 is connected, and at the same time, the second gear switching valve 14 is switched to the first working position (right position as shown in FIG. 1 ), so that the first pressure input port 141 of the second gear switching valve 14 and the first The second pressure input port 142 can only communicate with the first pressure output port 143 and the third pressure output port 145 . And when the second clutch solenoid valve 19 is opened, the second clutch controlling the even-numbered gears is in the engaged working state, and the dual-clutch automatic transmission is working in the even-numbered gears, so the next gear to be engaged is an odd-numbered gear. Therefore, through appropriate gear design, for example, the first gear shift cylinder 41 connected with the first pressure output port 133 and the third pressure output port 135 of the first gear switching valve 13 and the second gear switching valve The third gear shift cylinder 43 connected to the first pressure output port 143 and the third pressure output port 145 of 14 is designed to control the odd gears, and when the second clutch electromagnetic valve 19 is opened, the first gear shift valve 13 and the second gear switching valve 14 can only be hung into odd gears, so that when the second clutch of even gears works, the operation of even gears is prohibited. That is to say, by controlling the first gear switching valve 13, the second gear switching valve 14, the odd-even selection valve 17, the first clutch solenoid valve 18 and the second clutch solenoid valve 19 in the shift control system, It can be realized that when the clutches of odd gears (or even gears) are working, the operation of odd gears (or even gears) is prohibited, thereby avoiding damage to the automatic transmission due to misoperation, and improving system safety and robustness.

In order to engage the reverse gear when the first clutch solenoid valve 18 and the second clutch solenoid valve 19 are not open, the odd-even selector valve 17 also has a third control terminal 177, a third control terminal 177 and a first control terminal 175. Located at the same end of the odd-even selector valve 17, the third control end 177 is connected with the first switch solenoid valve 29. When the first switch solenoid valve 29 is opened, the first switch solenoid valve 29 outputs control pressure and is applied to the odd-even selector valve 17. The third control end 177 pushes the odd-even selection valve 17 to reversing to make it in the second working position (left position as shown in FIG. 1 ), so as to be able to select the reverse gear.

In this embodiment, the pressure output port 182 of the first clutch electromagnetic valve 18 is also connected with an odd gear pressure sensor 31 to detect the working pressure when driving the first clutch to engage; similarly, the pressure of the second clutch electromagnetic valve 19 The output port 192 is also connected with an even gear pressure sensor 32 to detect the working pressure when driving the second clutch to engage. In order to cut off the pipeline when there is an abnormal pressure in the pipeline where the clutch is engaged, a clutch safety cut-off valve 33 is also connected to the pressure output port 182 of the first clutch solenoid valve 18 and the pressure output port 192 of the second clutch solenoid valve 19 , the pressure output port of the first gear electromagnetic valve 27 and the pressure output port of the second gear electromagnetic valve 28 are also connected to the same control terminal of the clutch safety cut-off valve 33 at the same time, when the first gear electromagnetic valve 27 and the second gear When both solenoid valves 28 are open, the clutch safety cut-off valve 33 will be pushed from the open position (as shown in Fig. 1) to the closed position (left position as shown in Figure 1) to cut off the control oil circuit that controls clutch engagement.

In order to make the control pressure applied to each control end of the shift control valve 12, the first gear switching valve 13, the second gear switching valve 14, the first gear switching valve 15 and the second gear switching valve 16 tend to be In order to improve the stability of each valve body during reversing operation, an electromagnetic pressure regulating valve 34 is connected to the output port of the main pump 11. The electromagnetic pressure regulating valve 34 is a proportional pressure reducing valve of slide valve type. The regulating valve 34 has a pressure input port 341 and a pressure output port 342, the pressure input port 341 is connected to the main pump 11, and the pressure output port 342 is connected to the pressure input port of each electromagnetic valve 26, 27, 28, 29 and the odd-even selection valve 17, The pressure output port 342 of the electromagnetic pressure regulating valve 34 also acts pressure feedback on one end of the electromagnetic pressure regulating valve 34 to react against the spring disposed at the other end of the electromagnetic pressure regulating valve 34 . In this way, even if the output pressure of the main pump 11 fluctuates, after being regulated by the electromagnetic pressure regulating valve 34, the pressure output from the pressure output port 342 is always kept relatively stable, so that the output pressure through each electromagnetic valve 26, 27, 28, 29 and The control pressure applied to each control end after the odd-even selection valve 17 also tends to be stable.

The shift control system further includes a main oil circuit pressure solenoid valve 35 and a main oil circuit pressure relief valve 36. The pressure input port of the main oil circuit pressure solenoid valve 35 is connected with the pressure output port 342 of the electromagnetic pressure regulating valve 34. The pressure output port of the oil circuit pressure solenoid valve 35 is connected to the closed end of the main oil circuit pressure relief valve 36 (the closed end is also provided with a spring), and the main oil circuit pressure relief valve 36 has a pressure input port, a first pressure output port and the second pressure output port, the opening end (that is, the end opposite to the closing end) and the pressure input port of the main oil circuit pressure relief valve 36 are connected with the output port of the main pump 11, and the main oil circuit pressure relief valve 36 The first pressure output port of the main oil circuit pressure relief valve 36 is connected to the oil inlet port of the main pump 11 , and the second pressure output port of the main oil circuit pressure relief valve 36 leads to the lubricating cooling system 50 . The control pressure applied to the closed end of the main oil circuit pressure relief valve 36 can be changed by the main oil circuit pressure solenoid valve 35, so that the main oil circuit pressure relief valve 36 can be converted from the closed position to the open position, thereby making the main oil circuit Part of the oil in the system can be sent to the lubricating and cooling system 50 through the main oil circuit pressure relief valve 36 to meet the needs of cooling the oil and lubricating related components.

The lubricating cooling system 50 includes a cooling flow pressure limiting valve 51 , an oil cooler 52 , a pressure filter 53 , a one-way valve 54 , a small flow regulating valve 55 , a large flow regulating valve 56 and a second switching solenoid valve 57 . The cooling flow pressure limiting valve 51 is connected to the second pressure output port of the main oil circuit pressure relief valve 36 , and the cooling flow pressure limiting valve 51 is used to limit the oil pressure in the lubricating cooling system 50 . The oil cooler 52 and the pressure filter 53 are connected with the cooling flow pressure limiting valve 51 for cooling and fine filtering the oil. The one-way valve 54 is connected in parallel with the oil cooler 52 and the pressure filter 53, and the opening pressure of the one-way valve 54 is set to be relatively large, so under normal circumstances the oil flows through the oil cooler 52 and the pressure filter 53, Only when the oil cooler 52 and the pressure filter 53 are blocked, for example, does the oil bypass the check valve 54 . After the oil is cooled and filtered, it can be distributed to the components that need to be lubricated through the small flow regulating valve 55 for lubrication, and the excess oil can be returned to the oil tank 22 through the large flow regulating valve 56 . When the oil required for lubrication is a large flow, the large flow regulating valve 56 can be opened by the second switch solenoid valve 57, the second switch solenoid valve 57 has a pressure input port and a pressure output port, the pressure of the second switch solenoid valve 57 The input port is connected to the pressure output port of the electromagnetic pressure regulating valve 34, and the pressure output port of the second switching solenoid valve 57 is connected to the control end of the large flow regulating valve 56, so the large flow regulating valve can be pushed by the second switching solenoid valve 57 56 is reversed to open the large flow regulating valve 56.

The above are only preferred embodiments of the present utility model, and do not limit the utility model in any form. Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any Those who are familiar with this profession, without departing from the scope of the technical solution of the present utility model, can use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but all without departing from the technical solution of the utility model Content, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the utility model still belong to the scope of the technical solution of the utility model.

Claims (10)

1. A shift control system of an automatic transmission, comprising a main pump (11) and four shift cylinders (41, 42, 43, 44), characterized in that the shift control system also includes: The first gear switching valve (13), the first gear switching valve (13) has two pressure input ports (131, 132), four pressure output ports (133, 134, 135, 136) and a first control end (137) and second control end (138), the first control end (137) and second control end (138) of the first gear switching valve (13) are respectively located at the first gear switching valve (13 ), the first gear switching valve (13) can switch between the first working position and the second working position, when the first gear switching valve (13) is in the first working position, the first gear switching valve (13) The two pressure input ports (131, 132) of the gear switching valve (13) are respectively connected with two of the four pressure output ports (133, 134, 135, 136) of the first gear switching valve (13). The pressure output port is connected. When the first gear switching valve (13) is in the second working position, the two pressure input ports (131, 132) of the first gear switching valve (13) are connected to the first gear switching valve (13) respectively. The other two pressure output ports in the four pressure output ports (133, 134, 135, 136) of the switching valve (13) are connected; The second gear switching valve (14), the second gear switching valve (14) has two pressure input ports (141, 142), four pressure output ports (143, 144, 145, 146) and the first control end (147) and second control end (148), the first control end (147) and second control end (148) of the second gear switching valve (14) are respectively located in the second gear switching valve (14 ), the second gear switching valve (14) can switch between the first working position and the second working position, when the second gear switching valve (14) is in the first working position, the second The two pressure input ports (141, 142) of the gear switching valve (14) are respectively connected with two of the four pressure output ports (143, 144, 145, 146) of the second gear switching valve (14). The pressure output ports are connected. When the second gear switching valve (14) is in the second working position, the two pressure input ports (141, 142) of the second gear switching valve (14) are connected to the second gear switching valve (14) respectively. The other two pressure output ports in the four pressure output ports (143, 144, 145, 146) of the switching valve (14) are connected; The odd-even selection valve (17), the odd-even selection valve (17) has a pressure input port (171), a first pressure output port (172), a second pressure output port (173), a first control port (175) and a second The control terminal (176), the first control terminal (175) and the second control terminal (176) of the odd-even selection valve (17) are respectively located at the two ends of the odd-even selection valve (17), and the odd-even selection valve (17) The first pressure output port (172) is connected with the first control port (137) of the first gear switching valve (13) and the first control port (147) of the second gear switching valve (14). The second pressure output port (173) of the selection valve (17) is connected to the second control port (138) of the first gear switching valve (13) and the second control port (138) of the second gear switching valve (14) ( 148) are connected; the odd-even selection valve (17) can be switched between the first working position and the second working position, and when the odd-even selection valve (17) is in the first working position, the pressure input of the odd-even selection valve (17) The port (171) communicates with the first pressure output port (172) of the odd-even selection valve (17). When the odd-even selection valve (17) is in the second working position, the pressure input port (171) of the odd-even selection valve (17) ) is communicated with the second pressure output port (173) of the odd-even selector valve (17); The first clutch solenoid valve (18), the first clutch solenoid valve (18) is used to control the engagement of the first clutch, the first clutch solenoid valve (18) has a pressure input port (181) and a pressure output port (182) , the pressure output port (182) of the first clutch electromagnetic valve (18) is connected with the first control end (175) of the odd-even selection valve (17); The second clutch solenoid valve (19), the second clutch solenoid valve (19) is used to control the engagement of the second clutch, the second clutch solenoid valve (19) has a pressure input port (191) and a pressure output port (192) , the pressure output port (192) of the second clutch electromagnetic valve (19) is connected with the second control end (176) of the odd-even selection valve (17); Wherein, the four pressure output ports (133, 134, 135, 136) of the first gear switching valve (13) are connected to two of the four shift cylinders (41, 42, 43, 44) for shifting The four pressure output ports (143, 144, 145, 146) of the second gear switching valve (14) are connected to the other two shifting cylinders (41, 42, 43, 44) of the four shifting oil cylinders. The block oil cylinder is connected. 2. The shift control system of automatic transmission as claimed in claim 1, characterized in that: the shift control system further comprises: A shift control valve (12), the shift control valve (12) has a pressure input port (121) and two pressure output ports (122, 123), the shift control valve (12) can be in the first working position and Switch between the second working position, when the shift control valve (12) is in the first working position, the pressure input port (121) of the shift control valve (12) and the two pressure input ports of the shift control valve (12) One of the pressure output ports (122, 123) is connected, and when the shift control valve (12) is in the second working position, the pressure input port (121) of the shift control valve (12) is connected to the shift control valve (12). The other of the two pressure output ports (122, 123) of the valve (12) is communicated; The first gear switch valve (15), the first gear switch valve (15) is connected between the first gear switch valve (13) and the shift control valve (12), the first gear switch The valve (15) can be switched between the closed position and the open position. When the first gear switching valve (15) is in the closed position, the two pressure output ports (122, 123) of the shift control valve (12) are respectively It is disconnected from the two pressure input ports (131, 132) of the first gear switching valve (13), and when the first gear switching valve (15) is in the open position, the two The two pressure output ports (122, 123) are respectively communicated with the two pressure input ports (131, 132) of the first gear switching valve (13); and The second gear switch valve (16), the second gear switch valve (16) is connected between the second gear switch valve (14) and the shift control valve (12), the second gear switch The valve (16) can be switched between the closed position and the open position. When the second gear switching valve (16) is in the closed position, the two pressure output ports (122, 123) of the shift control valve (12) are respectively It is disconnected from the two pressure input ports (141, 142) of the second gear switching valve (14), and when the second gear switching valve (16) is in the open position, the two pressure input ports (141, 142) of the shift control valve (12) The two pressure output ports (122, 123) communicate with the two pressure input ports (141, 142) of the second gear switching valve (14) respectively. 3. The gear shift control system of an automatic transmission as claimed in claim 2, characterized in that: the gear shift control valve (12) is a spool type hydraulically controlled proportional directional valve, and the gear shift control system also includes a gear shift control valve. Pressure solenoid valve (26), the pressure output port of the shift pressure solenoid valve (26) is connected to the control end of the shift control valve (12), and the two pressure output ports (122) of the shift control valve (12) , 123) also respectively apply pressure feedback to both ends of the shift control valve (12). 4. The gear shift control system of automatic transmission as claimed in claim 3, characterized in that: the gear shift control system also includes an electromagnetic pressure regulating valve (34), and the electromagnetic pressure regulating valve (34) is a spool type proportional Pressure reducing valve, the electromagnetic pressure regulating valve (34) has a pressure input port (341) and a pressure output port (342), the pressure input port (341) of the electromagnetic pressure regulating valve (34) is connected with the main pump (11) The output ports are connected, and the pressure output port (342) of the electromagnetic pressure regulating valve (34) is connected with the pressure input port of the shift pressure electromagnetic valve (26). 5. The shift control system of automatic transmission as claimed in claim 4, characterized in that: the shift control system also includes a main oil circuit pressure solenoid valve (35), a main oil circuit pressure relief valve (36) and a lubrication Cooling system (50), the main oil circuit pressure solenoid valve (35) has a pressure input port and a pressure output port, the main oil circuit pressure relief valve (36) has a closing end and an opening end, and the main pump (11) has Oil inlet and oil outlet, the pressure input port of the main oil circuit pressure solenoid valve (35) is connected with the pressure output port (342) of the electromagnetic pressure regulating valve (34), the main oil circuit pressure solenoid valve (35) The pressure output port of the main oil circuit is connected to the closed end of the main oil circuit pressure relief valve (36); the main oil circuit pressure relief valve (36) also has a pressure input port, a first pressure output port and a second pressure output port, The open end and the pressure input port of the main oil circuit pressure relief valve (36) are connected with the oil outlet of the main pump (11), and the first pressure output port of the main oil circuit pressure relief valve (36) is connected with the The oil inlet port of the main pump (11) is connected, and the second pressure output port of the main oil circuit pressure relief valve (36) is connected with the lubricating cooling system (50). 6. The gear shift control system of an automatic transmission according to claim 2, characterized in that: the first gear switch valve (15) and the second gear switch valve (16) are hydraulically controlled shift valves of slide valve type. Directional valve, the first gear switching valve (15) has an opening end (151) and a closing end (152), and the second gear switching valve (16) also has an opening end (161) and a closing end (162), The shift control system also includes a first gear electromagnetic valve (27) and a second gear electromagnetic valve (28), and the control pressure output by the first gear electromagnetic valve (27) acts on the first gear switch valve The opening end (151) of (15) and the closing end (162) of the second gear switch valve (16), the control pressure output by the second gear solenoid valve (28) acts on the first gear switch valve The closing end (152) of (15) and the opening end (161) of the second gear switching valve (16). 7. The shift control system of an automatic transmission according to claim 6, characterized in that: the pressure output port (182) of the first clutch solenoid valve (18) and the pressure output port (182) of the second clutch solenoid valve (19) The clutch safety cut-off valve (33) is connected to the port (192), and the pressure output port of the first gear electromagnetic valve (27) and the pressure output port of the second gear electromagnetic valve (28) are also connected to the clutch at the same time. The same control end of the safety shut-off valve (33). 8. The shift control system of an automatic transmission according to claim 1, characterized in that: the four pressure output ports (133, 134, 135, 136) of the first gear switching valve (13) include the first pressure output port (133), second pressure output port (134), third pressure output port (135) and fourth pressure output port (136), when the first gear switching valve (13) is in the first working position, The two pressure input ports (131, 132) of the first gear switching valve (13) are respectively connected with the first pressure output port (133) and the third pressure output port (135) of the first gear switching valve (13). ), when the first gear switching valve (13) is in the second working position, the two pressure input ports (131, 132) of the first gear switching valve (13) are respectively connected to the first gear switching valve The second pressure output port (134) of (13) communicates with the fourth pressure output port (136); the four pressure output ports (143, 144, 145, 146) of the second gear switching valve (14) include the A pressure output port (143), a second pressure output port (144), a third pressure output port (145) and a fourth pressure output port (146), the second gear switching valve (14) is in the first working position , the two pressure input ports (141, 142) of the second gear switching valve (14) are respectively connected to the first pressure output port (143) and the third pressure output port of the second gear switching valve (14). (145) communicated, when the second gear switching valve (14) is in the second working position, the two pressure input ports (141, 142) of the second gear switching valve (14) are respectively connected to the second gear The second pressure output port (144) of the switching valve (14) communicates with the fourth pressure output port (146). 9. The shift control system of automatic transmission as claimed in claim 8, characterized in that: the four shift cylinders (41, 42, 43, 44) comprise a first shift cylinder (41), a second shift cylinder The oil cylinder (42), the third shift oil cylinder (43) and the fourth shift oil cylinder (44), the first pressure output port (133) and the third pressure output port (135) of the first gear switching valve (13) ) are respectively connected to both ends of the first shift cylinder (41), and the second pressure output port (134) and the fourth pressure output port (136) of the first gear switching valve (13) are respectively connected to the first Both ends of the second shift oil cylinder (42), the first pressure output port (143) and the third pressure output port (145) of the second gear switching valve (14) are respectively connected to the third shift oil cylinder (43 ), the second pressure output port (144) and the fourth pressure output port (146) of the second gear switching valve (14) are respectively connected to both ends of the fourth shift oil cylinder (44). 10. The shift control system of automatic transmission as claimed in claim 1, characterized in that: the odd-even selection valve (17) also has a third control terminal (177), and the third control terminal of the odd-even selection valve (17) (177) and the first control end (175) of the odd-even selection valve (17) are located at the same end of the odd-even selection valve (17), and the third control end (177) of the odd-even selection valve (17) is connected with a first The switching solenoid valve (29), the control pressure output by the first switching solenoid valve (29) acts on the third control terminal (177) of the odd-even selection valve (17).