Hydraulic system of automobile hybrid power transmission

Abstract

The invention provides a hydraulic system of an automobile hybrid power transmission, and belongs to the technical field of hydraulic pressure. The problems that an existing transmission hydraulic system is poor in cold start performance, high in energy consumption and high in cost are solved. The hydraulic system comprises a cooling lubricating oil way, a high-pressure oil way, a reversing valve,a mechanical lubricating pump and a duplex mechanical pump driven by an engine or a P1 motor. The high-pressure oil way is connected with a clutch piston cavity through a first control valve, and thehigh-pressure oil way is connected with the cooling lubricating oil way through an overflow valve. The mechanical lubricating pump is driven by the output end of a differential mechanism and connected with the cooling lubricating oil way, the duplex mechanical pump comprises a large-displacement pump and a small-displacement pump, the large-displacement pump communicates with a first oil inlet ofthe reversing valve and the high-pressure oil way, and a left oil outlet and a right oil outlet of the reversing valve both communicate with the cooling lubricating oil way. A reversing pilot pressure cavity of the reversing valve is connected with a clutch piston cavity, and the small-displacement pump communicates with a high-pressure oil way. The system is low in cost, good in cold start performance and low in energy consumption.

Description

technical field [0001] The invention belongs to the field of hydraulic technology, and relates to a hydraulic system of an automobile hybrid transmission. Background technique [0002] A hybrid vehicle refers to a vehicle whose drive system is composed of two or more single drive systems that can operate simultaneously. The driving power of the vehicle is provided by each drive system individually or jointly according to the actual driving state of the vehicle. Generally, the hybrid vehicle generally refers to a gasoline-electric hybrid vehicle. Existing automotive hybrid systems generally include three major powertrains, including an engine, a generator (P1 motor) and a drive motor (P3 motor). [0003] The hydraulic control system is an important subsystem of automatic transmissions of various hybrid electric vehicles, and is widely used in various transmission controls due to its high energy density and control stability. The hydraulic system mainly controls the combinat...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the above-mentioned problems in the existing technology, and propose a hydraulic system of a vehicle hybrid transmission. ...

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