A hydraulic brake-by-wire system with dual pressure sources and its brake control method

Abstract

The invention provides a hydraulic brake-by-wire system with double pressure sources and a brake control method of the hydraulic brake-by-wire system. In a brake pressure unit of the system, a high-pressure energy accumulator and a pressure boosting unit are connected to one side of a three-position three-way reversing electromagnetic valve, a branch of the other side of the three-position three-way reversing electromagnetic valve is connected with a main cylinder inner cavity through a normally-open switch electromagnetic valve, the other branch is connected with four brake wheel cylinders through four normally-open linear electromagnetic valves, the high-pressure energy accumulator is further connected with the main cylinder inner cavity through the other normally-open switch electromagnetic valve, a pressure sensor is installed in the position of an oil outlet of the high-pressure energy accumulator, and the pressure boosting unit is mechanically connected with a pressure boosting motor. Through cooperative work of the pressure boosting unit and the high-pressure energy accumulator, a vacuum pump and a pump motor are saved, the energy consumption of the brake system is reduced,meanwhile, according to brake requirements under different working conditions, the pressure boosting unit or the high-pressure energy accumulator is adopted for braking, and the overall energy consumption of the brake system is optimized.

Description

technical field [0001] The invention belongs to the technical field of brake-by-wire systems of intelligent electric vehicles or intelligent networked vehicles, and in particular relates to a hydraulic brake-by-wire system with dual pressure sources and a braking control method thereof. Background technique [0002] At present, with the increasing electrification and integration of vehicles, the development of intelligence and networking of vehicles has also developed rapidly. The security puts forward higher requirements. On the basis of improving the electrification and integration of the braking system, in view of the braking safety issues that are emphasized in the intelligentization and networking of vehicles, the braking system is required to have fast response speed, high pressure control precision, and stable braking performance. , It has functions such as fail-safe function and compatibility with vehicle-related intelligent driving functions. [0003] In the inven...

AI Technical Summary

Problems solved by technology

However, the braking system requires an electric pump and an oil return motor. The energy consumption of the braking system is relatively high. At the same time, the high-pressure accumulator is in a high-voltage state for a long time, and the system has certain safety.

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