Automatic gearbox control oil path for automobile

Abstract

An automatic gearbox control oil path for an automobile is used for realizing the gear control of a 4AT automatic gearbox. The automatic gearbox control oil path comprises an oil bottom case, an oil pump, a main pressure regulating valve, a lockup valve, a cooler, a hydraulic torque converter, a gear shifting valve assembly and a gear shifting execution unit, and the automatic gearbox control oil path is characterized in that the gear shifting valve assembly comprises a hand valve, a first gear shifting electromagnetic valve, a second gear shifting electromagnetic valve, a third gear shifting electromagnetic valve, a fourth gear shifting electromagnetic valve and a limp interlocking valve, wherein the first gear shifting electromagnetic valve, the third gear shifting electromagnetic valve and the fourth gear shifting electromagnetic valve are normally high pressure valves, and the second gear shifting electromagnetic valve is a normally low pressure valve. According to the automatic gearbox control oil path for the automobile, the problems caused by the complicated conventional 4AT control oil path and single limp gear are solved, the requirements that the automobile travels at the high-speed limp gear and the low-speed limp gear, the gear shifting comfort and the gear shifting smoothness when the automobile is moved into a garage are improved, the safety of the gearbox and a traveling automobile can be ensured, and the fuel economy of the automobile is improved.

Description

technical field [0001] The invention relates to an oil circuit of an automobile transmission, in particular to a control oil circuit of an automatic transmission (AT), and belongs to the technical field of vehicle transmission devices. Background technique [0002] AT hydraulic automatic transmission mainly includes hydraulic control mechanism, electronic control system and planetary gear mechanism. Among them, the hydraulic control mechanism refers to the control oil circuit composed of valve body, oil pump, clutch, brake, hydraulic torque converter and other components. The automatic transmission function of AT is realized through the design of the control oil circuit. [0003] In order to meet the increasingly strict requirements of vehicle driving safety, fuel economy and emission regulations, the design of AT control oil circuit pays more attention to the improvement of transmission efficiency and driving safety performance. The existing 4AT automatic transmissions are...

AI Technical Summary

Problems solved by technology

The existing 4AT automatic transmissions are equipped with auxiliary devices such as oil pumps, solenoid valves, actuators, fuel tanks, and pressure regulating valves in the control oil circuit. The valve locks the oil circuit of some non-working gears, and controls the switching of limp gears through the ON / OFF switch valve), which not only complicates the oil circuit, but also increases the processing difficulty of the valve body and increases the cost, and it is impossible to realize the full gear lock stop function

Especially because the existing AT automatic transmission only has a limp gear, when the vehicle limps, it cannot realize the function of power increase or engine braking under the condition of continuous slope; the dynamic performance is poor under the condition of continuous uphill or heavy load; Continuous braking of the brakes during long-distance downhill will cause the brakes to overheat, and there are hidden dangers to driving safety; driving at medium and high speeds cannot be achieved on straight roads; the vehicle suddenly enters a low-speed limp gear from a high-speed driving gear, which is prone to vehicle loss of control or transmission damage phenomenon

Images