Dual Clutch Transmission Hydraulic Control System

Abstract

A double-clutch transmission hydraulic control system mainly comprises a mechanical oil pump driven by an engine, a hydraulic source device of an electric oil pump driven by a motor, a clutch actuating high-pressure oil circuit, a shifting fork gear-shifting actuating high-pressure oil circuit and a lubrication cooling low-pressure oil circuit. The clutch actuating high-pressure oil circuit, the shifting fork gear-shifting actuating high-pressure oil circuit and the lubrication cooling low-pressure oil circuit are connected with the hydraulic source device. During normal operation, the mechanical oil pump supplies oil to a lubrication cooling low-pressure system, the electric oil pump supplies oil to the clutch actuating high-pressure oil circuit and the shifting fork gear-shifting actuating high-pressure oil circuit. When the engine is at a low speed or a lower oil temperature, the mechanical oil pump and the electric oil pump can supply oil to a shifting fork gear-shifting actuating high-pressure system simultaneously, so that the drive current of the electric oil pump is reduced, and the response speed of the hydraulic system is increased. However, when the engine is at a high oil temperature, the electric oil pump can also supplies oil to the lubrication cooling system to assist the mechanical oil pump in cooling double clutches. An electromagnet is used for positioning of a shifting fork gear-shifting oil cylinder, so that the design of the hydraulic system and valve bodies is simplified.

Description

technical field [0001] The invention relates to the field of automobile transmissions, in particular to a hydraulic control system of a dual-clutch transmission. Background technique [0002] In addition to the flexibility of manual transmission and the comfort of automatic transmission, dual clutch transmission can also provide uninterrupted power output; this transmission has two clutches, one controls odd gears and the other controls even gears; When shifting, the other gear is ready for shifting; when shifting, the power output is uninterrupted, there is no delay, and the shifting time is greatly shortened; the structure of the dual-clutch gearbox is very similar to that of a manual gearbox, and the dual-clutch gearbox also includes There is a power input shaft with gears and idler gears, and an intermediate shaft with gears of different gears, and the gears are changed through shift forks; the utility model of Chinese patent application No. CN201320767136.6 discloses a ...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the existence of the existing dual-pump hydraulic system that the mechanical oil pump often works under high pressure. Although its displacement can be half that of the traditional single-pump system, about 1.5% of the engine output power is still wasted at high speeds. , the overall efficiency of the transmission is low, to provide a dual clutch transmission hydraulic control system that reduces the waste of engine output power and the overall efficiency of the transmission is high

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