Method for estimating brake pressure of automobile and peak value of road adhesion coefficient

Abstract

The invention belongs to the technical field of automobile brakes, in particular to a method for estimating the brake pressure of an automobile and the peak value of the road adhesion coefficient, more particularly, the invention intends to provide a method for estimating the brake pressure of an automobile and the peak value of the road adhesion coefficient on the basis of the conditions of the wheel speed and pressure control under the condition that no component for measuring the brake pressure is introduced. The method comprises the following steps: grading the peak value of the road adhesion coefficient and the brake pressure; and estimating the peak value of the road adhesion coefficient and the initial brake pressure of a wheel cylinder. By estimating the peak value of the road adhesion coefficient and the initial brake pressure of the wheel cylinder, the invention is capable of estimating the brake pressure of the automobile and the peak value of the road adhesion coefficient under the condition that no component for measuring the brake pressure is introduced, thus improving the breaking efficiency of an ABS (anti-lock braking system) and providing strong support for the fail-safe function. According to the tests, the maximum relative error between the estimated value and the measured value of the pressure of the wheel cylinder of the brake is lower than 10%, thus meeting the requirements for ABS control, reducing the cost and facilitating the popularization of the ABS in the field of braking and being beneficial to the improvement on the traffic safety.

Description

technical field [0001] The invention belongs to the technical field of automobile braking, and in particular relates to an estimation method for automobile braking pressure and road surface peak adhesion coefficient. Background technique [0002] ABS (Anti-lock Braking System) is an auxiliary braking device currently equipped on automobiles. It is an automatic control system used to prevent wheel locking and maximize the use of road adhesion coefficients during braking. device. As people pay more and more attention to personal safety, higher requirements are put forward for the braking performance of the ABS system and its adaptability to road adhesion conditions. ABS should not only have high braking performance on high-adhesion roads with good road adhesion, but also on low-adhesion roads, butt joint roads with sudden changes in adhesion coefficients, open roads with large differences in left and right adhesion coefficients, and curves and roads. It still has high brakin...

AI Technical Summary

Problems solved by technology

Simultaneously estimating the brake pressure and adhesion coefficient without introducing the brake pressure measurement element, there is no report on this aspect

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