Parallel hydraulic hybrid driving system of vehicle

Abstract

The invention relates to a parallel hydraulic hybrid driving system of a vehicle, which comprises a mechanical transmission system and a hydraulic regenerative brake system, wherein the mechanical transmission system comprises an engine, a gearbox, a hydraulic control clutch, a power coupler, a two-way variable pump / motor, a transmission shaft and a rear driving axle; and the hydraulic regenerative brake system comprises a two-way variable pump / motor, a first stop valve, an oil tank, a variable mechanism of the two-way variable pump / motor, a plugin valve, a high pressure accumulator, a high pressure accumulator pressure gauge, a pressure sensor, a reducing valve, a two-position two-way reversing valve, an overflow valve and a filter. A charging / discharging major loop of the driving system adopts a controllable plugin valve, the plugin valve is controlled by controlling a pilot valve of the driving system, and the driving system responses rapidly. The driving system is convenient to operate and high in reliability, the power source switching is smooth, the power performances of the vehicle are improved, and the driving system has significant effects in recovering energy of the vehicle and improving fuel economy. The driving system meets the intermittent and high-power requirements and is used for the heavy vehicle requiring frequent start and parking operations.

Description

technical field [0001] The invention belongs to the field of automobile hybrid power, and in particular relates to a parallel hydraulic hybrid vehicle driving system. Background technique [0002] The hydraulic hybrid power system utilizes the characteristics that the hydraulic pump / motor can work in four quadrants, recovers the braking kinetic energy of the vehicle, and stores it in the high-pressure hydraulic accumulator. The recovered energy can provide auxiliary power during the starting or accelerating process of the vehicle, thereby Reduce fuel consumption and increase the service life of vehicle brakes. Compared with electric hybrid technology, hydraulic hybrid technology has the characteristics of high power density, high energy release and storage capacity in a short period of time. [0003] In advanced technology 1 (patents such as Ren Yongqiang, application number: 201210040215.7, application date July 2012 "Dual Power Energy Saving and Emission Reduction City Bu...

AI Technical Summary

Problems solved by technology

However, the main circuit of the hydraulic system of the patent application uses multiple cartridge valves, the hydraulic circuit is relatively complicated, and the energy loss is relatively large. The mechanical transmission system is powered by the gearbox and the hydraulic regenerative braking system, and the mechanical structure is relatively complicated.

Images