A hydraulic auxiliary driving/braking system for an electric vehicle and its control method

Abstract

A hydraulic auxiliary driving / braking system for an electric vehicle and a control method thereof according to the present invention belong to the technical field of hydraulic application of electric vehicles. The hydraulic auxiliary driving / braking system includes a motor speed-up mechanism, a rear wheel, a hydraulic valve group, Accumulators, electronic control units, power batteries, motors, planetary gears, front wheels, drive axles, fixed shaft gears, universal joints, high-pressure variable pumps, oil tanks, brake pedals, accelerator pedals and lockers. The invention aims to solve the problems of poor passability on bad roads, insufficient torque when overtaking at high speed, and low motor braking torque when braking at low speed in the existing front-drive electric vehicle.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle hydraulic application, and relates to a driving and braking device of an electric-hydraulic hybrid power system, in particular to a hydraulic auxiliary driving / braking system for an electric vehicle and a control method thereof. Background technique [0002] In recent years, with the rapid development of the automobile industry, hydraulic transmission technology has achieved certain results in vehicles, and the application of this technology is mostly concentrated in traditional vehicles. In China, the research on hydraulic technology for vehicles is mostly concentrated in colleges and universities. Jilin University has conducted related research on hydraulic auxiliary drive trucks, which has improved the driving ability of trucks on bad roads; Xiangtan University has proposed an improved vehicle system. Hydraulic retarder with dynamic performance; Foton Lovol launched the country's first...

AI Technical Summary

Problems solved by technology

[0003] Passenger cars mostly use front-wheel drive, which is relatively cheap compared to four-wheel drive vehicles, and the control technology is relatively simple. However, its driving performance is not as good as that of four-wheel drive vehicles.

Whether it is a four-wheel drive vehicle or a front-wheel drive vehicle, when the vehicle is continuously going downhill, there are frequent use of vehicle brakes, which seriously affects the braking stability of the vehicle and reduces the service life of the vehicle brake.

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