Contiuously variable transmission electro-hydraulic control system based on pilot control of high-speed switch valves

Abstract

The invention discloses a contiuously variable transmission electro-hydraulic control system based on the pilot control of high-speed switch valves. The system involves a speed ratio control hydraulicloop, a clamping force control hydraulic loop, an ECU electric control unit, a quantifying pump and a pilot pump; the speed ratio control hydraulic loop comprises a first HSV high-speed switch valve,a second HSV high-speed switch valve, a first cartridge valve, a second cartridge valve and a driving wheel hydraulic cylinder; the clamping force control hydraulic loop comprises a third HSV high-speed switch valve, a fourth HSV high-speed switch valve, a third cartridge valve, a fourth cartridge valve and a driven wheel hydraulic cylinder; and the ECU electric control unit is connected with thefirst HSV high-speed switch valve, the second HSV high-speed switch valve, the third HSV high-speed switch valve and the fourth HSV high-speed switch valve, and can be used for controlling the quantifying pump and the pilot pump to be opened. According to the system, the structure is simple, the cost is low, the cartridge valves are adopted by taking the high-speed switch valves as pilot valves,so that the high-pressure and large-flow working performance is easily realized, and the working efficiency of the system is improved.

Description

Technical field [0001] The invention relates to an electro-hydraulic control system of a continuously variable transmission controlled by a high-speed switch valve pilot control. Background technique [0002] Continuously Variable Transmission (CVT) can realize the continuous change of the transmission ratio without cutting off the power transmission during the gear shifting process, without frustration. A car equipped with a CVT can improve fuel economy and reduce emissions, and at the same time improve driver's handling convenience and occupant's ride comfort. It is a perfect transmission method. [0003] With the advancement of electronic and hydraulic technology, CVT transmission mechanism control system can be divided into: electro-hydraulic servo control system, electro-hydraulic proportional control system and full digital hydraulic control system. The core component of the electro-hydraulic servo control system is the electro-hydraulic servo valve, which has the advantages...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides an electro-hydraulic control system for continuously variable transmissions with high-speed on-off valve pilot control that can not only solve the problems of low control precision and slow response of the existing CVT, but also reduce costs and improve reliability.

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