Hydraulic gear shifting system of dual-clutch automatic transmission

Abstract

The invention relates to a hydraulic gear shifting system of a double-clutch automatic transmission. The hydraulic gear shifting system comprises a first pressure electromagnetic valve and a second pressure electromagnetic valve which are communicated with a main oil way; the first pressure electromagnetic valve is connected and communicated with a first flow electromagnetic valve and a second flow electromagnetic valve through the oil way; the first flow electromagnetic valve is connected and communicated with a first logic valve through the oil way, and the first logic valve is connected andcommunicated with a first gear shifting piston cylinder and a second gear shifting piston cylinder through the oil way; the second flow electromagnetic valve is connected and communicated with a second logic valve through the oil way, and the second logic valve is connected and communicated with a third gear shifting piston cylinder through the oil way; the second logic valve is further connectedand communicated with a third logic valve through the oil way, and the third logic valve is connected and communicated with a fourth gear shifting piston cylinder and a fifth gear shifting piston cylinder through the oil way; and the second pressure electromagnetic valve is connected and communicated with the first logic valve, the second logic valve and the third logic valve through the oil way.According to the hydraulic gear shifting system of the dual-clutch automatic transmission provided by the invention, the number of the electromagnetic valves can be reduced, shifting forks with the number larger than that of the electromagnetic valves are controlled, and the control difficulty can be reduced.

Description

technical field [0001] The invention relates to an automobile transmission, in particular to a hydraulic shift system of a double-clutch automatic transmission. Background technique [0002] For dual-clutch automatic transmissions, with more stringent energy consumption requirements, multi-speed dual-clutch transmissions such as 8-speed or 9-speed dual-clutch transmissions will become a future development trend. For an 8-speed or 9-speed dual-clutch transmission, at least 5 shift forks are required, so a more complex hydraulic shift system is required to support the multi-speed requirements of the transmission. The traditional hydraulic pressure of an 8-speed or 9-speed dual-clutch transmission The shifting system scheme will exceed the use of 5 solenoid valves, and the more solenoid valves, the higher the cost. Therefore, there is a need for further improvement in the hydraulic shifting system of the existing dual-clutch automatic transmission. [0003] CN 109296748A disc...

AI Technical Summary

Problems solved by technology

For an 8-speed or 9-speed dual-clutch transmission, at least 5 shift forks are required, so a more complex hydraulic shift system is required to support the multi-speed requirements of the transmission. The traditional hydraulic pressure of an 8-speed or 9-speed dual-clutch transmission The shifting system scheme will exceed the use of 5 solenoid valves, and the more solenoid valves, the higher the cost

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