Electric vehicle hydraulic brake system according with brake energy recovery and having ABS/ESP function

Abstract

The invention discloses an electric vehicle hydraulic brake system according with brake energy recovery and having ABS / ESP function, which comprises a pedal and a pedal push rod. The pedal push rod is connected with a pedal brake valve; a P port of the pedal brake valve is connected with an outlet oil way of a high pressure accumulator, a T port of the pedal brake valve is connected with an oil way of a liquid accumulator, and an A port of the pedal brake valve is connected with an oil way of an ABS / ESP hydraulic valve block; the oil way connecting the pedal brake valve and the ABS / ESP hydraulic valve block is provided with a pedal brake valve pressure sensor; the high pressure accumulator supplies oil by an oil pump through a one-way valve, and the oil pump is connected with the liquid accumulator; the ABS / ESP hydraulic valve block are respectively connected with four wheel cylinders on the front and rear of a vehicle through an oil way, and the four wheel cylinders are respectively provided with a wheel speed sensor; and a brake controller of the vehicle is in circuit connection with the pedal brake valve pressure sensor, the high pressure accumulator, the ABS / ESP hydraulic valve block and each wheel speed sensor. The hydraulic brake system has high safety, can meet the requirement of electric vehicle series brake energy recovery technology, and can realize the ABS / ESP function by controlling the ABS / ESP hydraulic valve block.

Description

technical field [0001] The invention relates to a vehicle hydraulic braking system, in particular to a hydraulic braking system applied to electric vehicles that meets the braking energy recovery requirements and has ABS / ESP functions. Background technique [0002] Under the dual pressure of energy and the environment, new types of vehicles including hybrid electric vehicles, pure electric vehicles and fuel cell vehicles have gradually emerged. This type of vehicle has a motor and a battery or a supercapacitor, so when braking, the motor can convert the braking kinetic energy of the vehicle into electrical energy and store it in the battery or supercapacitor, thereby realizing energy recovery and utilization. But generally speaking, the regenerative braking torque provided by the motor cannot meet the needs of vehicle braking, so this type of vehicle still needs to retain the original hydraulic braking system or pneumatic braking system, so the hydraulic braking system or pn...

AI Technical Summary

Problems solved by technology

The main disadvantage of this technology is: when the brake energy is recovered, the oil circuit connection between the brake master cylinder and the brake wheel cylinder is cut off by two two-position three-way valves, but at this time, the outlet of the master cylinder is blocked, resulting in The brake pedal cannot be depressed

[0005] The application number of Jilin University is "200710055687", and the patent title is "Integrated Control System of Regenerative Braking and Anti-lock Braking for Hybrid Cars". In the technical solution of this patent, the two outlets of the brake master cylinder pass through the ABS hydraulic valve. The oil inlet valve of the brake block is directly connected to the brake wheel cylinder, so when the brake wheel cylinder brake pressure is adjusted during the braking energy recovery process, it will cause large fluctuations in the pressure of the brake master cylinder, resulting in severe braking of the brake pedal Vibration, affecting pedal feel

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