Electronic hydraulic pressurization system and control method

Abstract

The invention relates to an electronic hydraulic pressurization system and a control method. The electronic hydraulic pressurization system comprises a pressurization power source module, a pressurization transmission module, a brake main cylinder module and an electronic control unit, wherein the output end of the pressurization power source module is connected with the brake main cylinder modulethrough the pressurization transmission module, and the pressurization power source module achieves switching or superposition of pressurization torque through the pressurization transmission module;the electronic control unit controls output of the pressurization power source module and switching and mixing of the pressurization transmission module, and the brake main cylinder module is used for feeding back pressure signals to the electronic control unit. Two motors of the pressurization power source module are subjected to torque coupling through a planetary gear mechanism and output through a gear ring. The pressurization transmission module adopts a ball screw mechanism, and the gear ring is in threaded engagement with the outer circumference of a ball screw nut; and three driving pressurization modes are achieved through cooperation of two locking mechanisms and the two pressurization motors in terms of rotating speed and torque. It can be guaranteed that the pressurization capacity is still achieved when the first pressurization motor breaks down and fails.

Description

technical field [0001] The invention relates to the technical field of vehicle brake-by-wire, in particular to an electronic hydraulic booster system and a control method with a failure operation capability. Background technique [0002] Brake-by-wire system is the basis and premise for electric vehicle to realize braking energy recovery and intelligent vehicle to realize active braking, and it plays a vital role in realizing high-level unmanned driving technology. According to the regulations of the American Society of Automotive Engineers (SAE) for the driverless level, L4 and L5 autonomous driving does not require the driver to take over during the driving process. Therefore, in the above-mentioned level of autonomous driving, the use of a brake-by-wire system is an inevitable requirement. However, due to the high complexity of automatic driving, various failures are inevitable in the car, among which the failure of the braking system will lead to the reduction or even d...

AI Technical Summary

Problems solved by technology

[0004] However, in the L4 and L5 autonomous driving environment, there is no driver to take over the vehicle, so the traditional fail-safe level brake-by-wire system is no longer suitable for L4 and L5 autonomous driving

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