Hydraulic control system for wet-type double-clutch automatic transmission

Abstract

The invention belongs to automobile transmissions, in particular to a hydraulic control system for a wet-type double-clutch automatic transmission. The hydraulic control system consists of two separate subsystems, wherein one subsystem is a clutch and gearshift mechanism hydraulic control subsystem which is mainly used for operating an odd number gear clutch and an even number gear clutch to separate and combine according to a control signal transmitted by an electronic control unit as well as operating a gear-shift mechanism control oil cylinder to finish switching of each gear synchronizer; and the other subsystem is a clutch cooling and lubricating subsystem. By adopting a more scientific and reasonable hydraulic control system, the efficiency of the hydraulic control system for the wet-type double-clutch automatic transmission is improved, the fuel consumption is reduced, the effects of saving energy and reducing emission are achieved, and the reliability of the system work and the compactness of the structure are enhanced.

Description

technical field [0001] The invention relates to transmissions, in particular to a hydraulic control system for wet dual-clutch automatic transmissions. Background technique [0002] Dual-clutch automatic transmission is a new type of automatic transmission system developed on the basis of parallel shaft manual mechanical transmission. It not only maintains the advantages of simple structure and high transmission efficiency of electromechanical automatic transmission (AMT), but also can Through the cooperative control of the separation and combination of the two clutches, the transmission ratio can be changed without interrupting the power, which greatly shortens the shifting time and improves the shifting quality, so that the whole vehicle has excellent fuel economy and power. It has been widely used at present. [0003] In a dual-clutch automatic transmission, there are two sets of transmission mechanisms that are independent of each other, one of which is composed of odd-...

AI Technical Summary

Problems solved by technology

Since the flow requirements of each system must be met when the engine is idling (usually at a low speed), the oil pump is required to have a large displacement, which will cause a large power loss

[0007] 2. Since the quantitative oil pump is directly connected to the output end of the engine, as the engine speed increases, the output flow of the oil pump will also increase accordingly. The increased flow far exceeds the flow required by the system when it is working, which will cause problems in the valve control system. Large throttling energy loss, these throttling energy losses will be converted into temperature rise of the system oil, and will cause problems such as system oil aging, seal hardening, and increased leakage, while causing energy waste, noise pollution, etc.

In this way, on the one hand, the requirements on the oil are very high, which increases the cost of the oil. On the other hand, the oil in the hydraulic control system is easily polluted, which will greatly reduce the reliability of the system.

[0010] 5. Due to the large working flow of the system, the size of the hydraulic components such as the oil pump, hydraulic control valve, filter, oil tank and pipeline in the system is relatively large, which is not conducive to the compactness and miniaturization of the structure of the hydraulic control system

[0011] In short, the existing technical scheme of the hydraulic control system of the wet dual-clutch automatic transmission has the problems of unreasonable use of flow rate, large power loss, large temperature rise, easy oil pollution, and low working reliability.

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