Drive-by-wire hydraulic brake system and brake control method for independently controlling four-wheel pressure

Abstract

The invention provides a drive-by-wire hydraulic brake system and brake control method for independently controlling four-wheel pressure. Four pressure control units in the system are connected with abrake main cylinder pipeline in a brake pedal mechanism through a main cylinder normally open switch electromagnetic valve, each pressure control unit is respectively composed of a normally open switch electromagnetic valve, an electronic control pressurizing unit, and a normally open linear electromagnetic valve in series sequentially; the down stream of the normally open linear electromagneticvalve is respectively with a brake wheel cylinder, pressure sensors are arranged on a pipeline where the normally open linear electromagnetic valve and the brake wheel cylinder are connected; the electromagnetic valves, the sensors and the electronic control pressurizing units are respectively in signal connection with an electronic control unit; the brake control method comprises a brake controlmethod of an effective state of electrifying and a brake control method of a failure state of outage. The four pressure control units respectively independently control the pressurization, pressure preservation or pressure reduction of the brake wheel cylinder. The drive-by-wire hydraulic brake system for independently controlling four-wheel pressure and the brake control method thereof can actively build up pressure, rapidly pressurize, accurately control pressure and has functions of failure braking and regenerative braking during vehicle braking.

Description

technical field [0001] The invention belongs to the technical field of a brake-by-wire brake system for an intelligent electric vehicle or an intelligent networked vehicle, and in particular relates to a hydraulic brake-by-wire system with four-wheel pressure independent control and a brake control method thereof. Background technique [0002] In the context of increasingly serious air pollution problems, the focus of the development of the automobile industry is gradually shifting from the field of traditional fuel vehicles to the field of new energy vehicles such as hybrid vehicles or pure electric vehicles. Under such circumstances, various companies have invested a lot of money in the design and development of new energy vehicles, and with the deepening of new energy vehicle research and development, correspondingly, the braking of new energy vehicles such as hybrid vehicles and pure electric vehicles The system puts forward new requirements. In order to achieve the ele...

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a wire-controlled hydraulic braking system with four-wheel pressure independent control and its braking control method, in order to overcome the traditional braking system vacuum booster in the prior art, which is bulky, expensive, unable to realize the active braking function, and The dynamic pressure is not easy to control accurately, cannot match the current intelligent driving assistance functions such as ACC and AEB, and the existing motor-driven brake-by-wire system has relatively high requirements on motor performance. Combined with the accompanying drawings in the specification, the technical solution of the present invention as follows:

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