Pressure control method for hydraulic system of hybrid transmission

Abstract

The invention provides a pressure control method for a hydraulic system of a hybrid gearbox. When a corresponding clutch and a corresponding brake do not need to work, the control current of an electromagnetic pressure regulating valve and an electromagnetic reversing valve is 0, hydraulic oil flowing out of an electric hydraulic pump all flows to a first lubricating oil path output terminal and asecond lubricating oil path output terminal, and meanwhile, the clutch and the brake are in pressure relief states; and when the corresponding clutch and the corresponding brake are needed to work, the electromagnetic pressure regulating valve is electrified, pressure required by the clutch and the brake is produced, the electromagnetic reversing valve achieves the connection of the correspondingclutch and the corresponding brake through switching oil passages according to needs, a part of the hydraulic oil flowing out of the electric hydraulic pump flows to the first lubricating oil path output terminal and the second lubricating oil path output terminal, the other part of the hydraulic oil flows to the corresponding clutch and the corresponding brake passing by a cooling overflow valve, the electromagnetic pressure regulating valve and the electromagnetic reversing valve, and the corresponding clutch and the corresponding brake are controlled to work. The pressure control method for the hydraulic system of the hybrid gearbox is simple and feasible.

Description

technical field [0001] The invention relates to a pressure control method of a hybrid transmission hydraulic system. Background technique [0002] With environmental pollution and increasingly stringent fuel consumption and emission regulations at home and abroad, major automobile companies are focusing on the development of power systems with ultra-high fuel economy. Hybrid power systems that take into account fuel economy and technology maturity have become ideal at this stage. a choice of . [0003] The gearbox of a hybrid vehicle mostly adopts a planetary gear transmission mechanism, for example, a dual-planetary four-shaft hybrid transmission disclosed in the invention patent No. 200910194470.5. Its main components include two motors, an engine, a double planetary Shock absorbers, two lock-up clutches, various drive trains and the complete vehicle. Compared with the Prius structure, this structure can lock the first lock-up clutch when it is in the pure electric drivi...

AI Technical Summary

Problems solved by technology

The motor oil cooling scheme has more advantages than the water cooling scheme in the integrated design of the gearbox, especially for the hybrid transmission with shifting elements, it will involve the control of clutches and brakes, and these problems are generally realized by hydraulic systems. The quality of the structural design of the hydraulic system and how to control the pressure of the hydraulic system will ultimately affect the use of the gearbox and affect the performance and service life of each component in the gearbox

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