Hydraulic control system for dual-clutch automatic transmission

Abstract

The invention relates to a hydraulic control system for a dual-clutch automatic transmission. The system comprises a suction filter, an oil pump, a cooler, a first clutch hydraulic cylinder, a second clutch hydraulic cylinder, a three-gear synchronizer hydraulic cylinder, a five-gear synchronizer hydraulic cylinder, a four-reverse-gear synchronizer hydraulic cylinder and two six-gear synchronizerhydraulic cylinders and also comprises a main oil way, a lubricating and cooling oil way part, a dual-clutch control part and a gearshift actuator control part. 8 proportional solenoid valves, 4 switch valves and 3 mechanical slide valves are adopted in total, the quantity of the solenoid valves which need to act simultaneously is small during gear selection and shifting, and the control is simple. While in clutch control, two normally closed switch valves are added, and the switch valves are directly cut off when a clutch pressure control valve fails in the working position so that clutch pressure oil flows into an oil pan to ensure driving safety. While in gearshift actuator control, pressure and flow dual control is adopted, the engagement and disengagement speed is adjusted, smooth gear shifting process is ensured, and riding comfort is increased.

Description

technical field [0001] The invention belongs to the technical field of automobile gearboxes, and in particular relates to a hydraulic control system for a dual-clutch automatic gearbox. Background technique [0002] A typical dual-clutch transmission consists of two coaxial nested or parallel clutches, two coaxial, inner and outer nested input shafts, two parallel output shafts, and multiple synchronous clutches arranged on the output shafts. It consists of a shifter device, multiple shift forks and a differential. The odd and even gear input gears of the transmission are respectively arranged on the two input shafts, through the switching of the two clutches and the actions of different synchronizers, the torque conversion and output are realized through different output shafts. The dual-clutch hydraulic control system refers to accepting the control signal of the TCU, and adjusting the oil pressure, flow and direction through various actuators to control the actions of th...

AI Technical Summary

Problems solved by technology

[0003] The current dual-clutch control system uses too many mechanical slide valves or even multi-way valves, the control strategy is not accurate, the response speed of the whole system is slow, the control is not precise enough, and the risk of safety control is high.

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