Electro-hydraulic proportional valve control pump/motor hydraulic power assisted system of electric automobile

Abstract

The invention discloses an electro-hydraulic proportional valve control pump / motor hydraulic power assisted system of an electric automobile, which comprises a hydraulic drive circuit, a compound brake system and an electric controller. The hydraulic drive circuit comprises a hydraulic pump / motor, a high-pressure accumulator, a low-pressure accumulator, an electromagnetic directional valve, an electric-hydraulic proportional pressure reducing valve and the like. The brake system comprises a brake pedal, a brake master cylinder, a direct-control sequence valve, a displacement sensor and the like. The hydraulic pump / motor is coupled with a power motor and a drive axle through a transfer case. When brake is performed, the hydraulic pump is driven by the inertia of the automobile to prefill the high-pressure accumulator, and a brake force is generated on the automobile by the drive torque of the pump. When emergency brake is performed, high-pressure oil is exported by the brake master cylinder to enter a brake cylinder, and the brake force is generated by the brake cylinder and the hydraulic pump together. When the automobile starts or is accelerated, if the current of the motor is out of limit, torque is output by the hydraulic motor to assist the motor in driving the automobile, the current of the motor is reduced, the discharge rate of a power battery is reduced, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to an electro-hydraulic proportional valve-controlled pump / motor hydraulic booster system for an electric vehicle, which belongs to the technical field of hydraulic transmission. Background technique [0002] In order to save energy and protect the environment, in recent years, new energy vehicles have become the strategic focus of the development of the automobile industry in various countries in the world. Among them, electric vehicles have attracted much attention as the main technical solution. At present, the main technical obstacle to the development of electric vehicles is the power storage battery technology. As the power source of a car, capacity is the most important performance indicator of a power battery. The capacity of a single battery is not a fixed number, it is related to the usage of the battery, especially the charge and discharge rate. Excessive charge and discharge rate will significantly reduce the battery...

AI Technical Summary

Problems solved by technology

From the perspective of technical performance alone, supercapacitors combined with batteries are indeed an ideal form of energy combination. However, at present, supercapacitors still lack competitiveness in terms of price and cost of use, and it will take time to realize industrialization.

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