Drive device for hybrid electric vehicle based on transformer, hydraulic pump and multiple motors

Abstract

The invention provides a hybrid power vehicle drive device based on a transformer, a hydraulic pump and a multi-joint motor. The hybrid power vehicle drive device comprises an engine, a fixed displacement hydraulic pump, a clutch, a fixed displacement multi-joint hydraulic motor, a one-way valve, a high-pressure energy accumulator, a low-pressure energy accumulator, a three-position five-way reversing valve and a two-position two-way reversing valve, wherein the fixed displacement multi-joint hydraulic motor consists of more than two fixed displacement hydraulic motors; and each motor is independently controlled by a two-position three-way reversing valve so as to adjust the displacement of the fixed displacement hydraulic motors. By the drive device in the form, the engine can be guaranteed to work in a best fuel economic zone; the transmission efficiency can be improved; the stepless speed change and the braking energy recovery of a vehicle can be realized; and five transmission forms, namely purely mechanical transmission, hybrid power transmission without a hydraulic transformer, the hybrid power transmission with the hydraulic transformer, purely hydraulic transmission without the hydraulic transformer and the purely hydraulic transmission with the hydraulic transformer can be provided. Therefore, the power performance of the vehicle can be improved; and the fuel consumption rate of the overall vehicle can be reduced.

Description

technical field [0001] The invention relates to a vehicle transmission hybrid driving device, in particular to a hybrid vehicle driving device based on a transformer, a hydraulic pump and multiple hydraulic motors. Background technique [0002] Energy and environmental issues have become the focus of discussion in today's society, and energy conservation and emission reduction have risen to an issue related to the survival of human beings. As one of the important means to deal with these problems, hybrid power includes electric hybrid power, mechanical hybrid power and hydraulic hybrid power. Among them, the development of electric hybrid power is restricted by battery technology; mechanical hybrid power is difficult to maintain high-efficiency flywheel operation for a long time; hydraulic hybrid power requires the most mature technology and high power density, especially for medium and heavy vehicles. Traditional hydraulic hybrid vehicles usually use variable displacement ...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention provides a hybrid vehicle drive device based on transformers, hydraulic pumps and multiple motors, through hydraulic transformers, fixed-displacement multiple hydraulic motors and fixed-displacement hydraulic pumps, the power of hydraulic hybrid vehicles can be greatly improved Performance and transmission efficiency, overcome the problems of poor dynamic performance of traditional hydraulic hybrid drives, low efficiency of variable displacement hydraulic motors at low displacement, high cost, large volume and heavy weight

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