Automatic gearbox built-in electronic gear shifting hydraulic system and control method thereof

Abstract

The invention discloses an automatic gearbox built-in electronic gear shifting hydraulic system and a control method thereof. The hydraulic system comprises a D / N / R gear shifting mechanism, a gear shifting electronic control valve, an executing mechanism, an oil supply cavity and an oil way, wherein the D / N / R gear shifting mechanism comprises a valve body, a gear shifting valve element, a limitingvalve element, a spring and an end plug, the limiting valve element is provided with a left working position and a right working position, the gear shifting valve element is provided with a left working position, a middle working position and a right working position which correspond to a gear R, a gear N and a gear D respectively, and the gear shifting electronic control valve comprises an electromagnetic switch valve A and an electromagnetic switch valve B. According to the automatic gearbox built-in electronic gear shifting hydraulic system and the control method thereof, when the D gear is achieved, the electromagnetic switch valve A is closed, when the gear N is achieved, the electromagnetic switch valve A and the electromagnetic switch valve B are opened, when the gear R is achieved, the electromagnetic switch valve A is opened, and the electromagnetic switch valve B is closed, so that automatic D / N / R gear shifting is achieved, the driving automation degree is improved, the sizeis reduced, the cost is reduced, and the gear shifting reliability is enhanced.

Description

technical field [0001] The invention relates to the technical field of automatic transmissions for automobiles, in particular to a hydraulic system with built-in electronic gear shifting in automatic transmissions and a control method thereof. Background technique [0002] At present, most continuously variable transmission automatic transmission vehicles all adopt mechanical control gear shifting, and the driver still needs to manipulate the gear lever to switch between P, R, N, and D gears. This method also has requirements for the layout space, and also has relatively high requirements for the driver's driving skills. With the improvement of automobile automation technology, the mechanical shift structure is difficult to meet the intelligentization of automobiles and user needs. The premise of the application of technologies such as automatic parking and automatic driving is that the vehicle has an electronic shift function. Without changing the internal structure of the...

AI Technical Summary

Problems solved by technology

Without changing the internal structure of the gearbox, adding an external electronic shifting mechanism can also realize the automatic shifting function of the car, but it still requires a certain amount of driving space for layout, which is not flexible enough; using a built-in electronic shifting mechanism is beneficial to the car. assembly in the inner space, but still need to reduce the space occupied inside the gearbox

The integrated multi-way valve series-parallel oil circuit used in most existing electronic shifting mechanisms is not conducive to the mechanical self-locking function of the oil circuit, and is prone to shift shock and poor reliability. The multi-way valve oil circuit adopts multiple Solenoid valve, complex oil circuit connection, high cost

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