Electro-hydraulic control system of hydrodynamic-mechanic automatic transmission and control method of electro-hydraulic control system

Abstract

The invention relates to an electro-hydraulic control system of a hydrodynamic-mechanic automatic transmission and a control method of the electro-hydraulic control system. The electro-hydraulic control system comprises a shift control system, a shift lever, electromagnetic valves, a hydraulic shift valve group and a clutch; the shift control system is connected with the shift lever and the electromagnetic valves through wires, and the electromagnetic valves are connected with the hydraulic shift valve group; the hydraulic shift valve group is controlled through the electromagnetic valves, oil charging and discharging of a piston of the clutch is controlled, and connection and disconnection of the clutch is realized; automatic shift operation of the hydraulic mechanical type automatic transmission of tracked vehicles can be realized, system oil pressure is regulated in time through a pressure regulating valve of a hydraulic control system, stable oil pressure in loops is guaranteed, a manual shift mode and an automatic shift mode are switched smoothly, and safety of the system is guaranteed.

Description

technical field [0001] The invention relates to the field of shift control of an automatic transmission, in particular to an electro-hydraulic control system and a control method of a hydraulic-mechanical automatic transmission. Background technique [0002] Automatic transmission technology has developed and evolved over the decades to form a technology widely used in vehicle drivetrains today. There are many types of automatic transmissions. At present, there are mainly: hydraulic mechanical automatic transmission AT (Automatic Transmission), automatic mechanical transmission AMT (Automatic Mechanical Transmission), mechanical continuously variable transmission CVT (Continuously Variable Transmission), dual-clutch automatic transmission Transmission DCT (Dual Clutch Transmission). Because the hydromechanical automatic transmission has good road adaptive ability, it improves the vehicle's dynamics and average driving speed, makes the vehicle start and accelerate more smoot...

AI Technical Summary

Problems solved by technology

Depending on the hydraulic torque converter and planetary gear mechanism of different gearboxes, the shift control system also has different design requirements. Although the stability and comfort of the hydraulic mechanical automatic transmission have been greatly improved in theory, in practice In the application, due to the poor stability of the output pressure of the clutch piston controlled by the hydraulic shift control system, the impact of the clutch engagement or separation process is relatively large, resulting in a large shift impact during the shifting process of the gearbox, which reduces the stability of the vehicle during driving.

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