Emergency automatic brake steady-state control method based on real-time road surface recognition

Abstract

The invention discloses an emergency automatic brake steady-state control method based on real-time road surface recognition. When reasonable AEB autonomous emergency brake action needs to be conducted, the road surface type and the friction coefficient at the moment can be effectively recognized in time through the sub-function pre-brake prompt function, and performance attenuation of a vehicle is effectively judged. In combination with the vehicle distance and the vehicle speeds of front and rear vehicles, a proper compensation amount is calculated to perform reasonable compensation for thebrake opportunity, the defect of deceleration response is overcome by properly compensating the brake force aiming at performance attenuation of the vehicle, so that the current road condition can berecognized even on a slippery road surface, the automatic emergency brake controller can correctly compensate a brake instruction, and collision accidents caused by the slippery road surface and untimely brake are avoided. Aiming at insufficient deceleration response caused by reduction of vehicle performance, the stability of deceleration execution can be met through proper deceleration compensation factor adjustment, and collision is prevented.

Description

technical field [0001] The invention relates to the technical field of vehicle body control, in particular to a steady-state control method for emergency automatic braking based on real-time road surface recognition. Background technique [0002] With the rapid advancement of automobile technology and the continuous improvement of people's requirements for vehicle safety, as well as the stricter requirements for vehicle active safety in the regulations of the automobile industry, the market for intelligent assisted driving vehicles is becoming more and more popular. The automatic emergency braking function is an active safety function, and the data from the China Automobile Association shows that the equipment range has increased significantly. Since CNCAP is a standard test scenario, although there are strict requirements, it is foreseeable that the functions that perform well in the test scenario will be reflected in the difference in performance on public roads. The pres...

AI Technical Summary

Problems solved by technology

The various AEB emergency braking systems currently on the market do not fully consider the type of road surface, adhesion coefficient, and vehicle status. They are all calibrated on the basic standard friction coefficient road surface, and environmental factors such as ice, snow, and rain are not considered. The friction coefficient changes, and the calibration completed by the test sample vehicle also does not consider the performance attenuation caused by vehicle aging and brake system wear

If it is measured according to the calibration of the AEB system at the time of departure, it cannot guarantee timely and accurate braking, and the occurrence of collision accidents cannot be avoided.

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