Coordinated control method for anti-lock braking pressure of multi-axle commercial vehicle brake-by-wire system

Abstract

The invention discloses a method for coordinating control of anti-lock braking pressure of a multi-axis commercial vehicle brake-by-wire system, which includes the following steps: S1. According to the stroke of the brake pedal, calculate oil outlets 1 and 2 and two independent pressure building modules of QEBS pressure; S2, receive ABS data, the ABS data includes P wh ,P req 、dp req ,p lstMax , fg h2l , fg l2h Parameters and ABS activation status, ABS fault status. In the present invention, based on the current ABS target pressure, the target pressure gradient demand, the maximum pressure value of the last pressurization cycle of the ABS, and the QEBS coordination pressure target algorithm logic of the docking road surface identification mark, a more reasonable pressure control of the pressure chamber under ABS working conditions is realized. ; When the ABS valve / motor fails, the two-way pressure output capacity can be output through QEBS. On the premise of maintaining the required braking force, the center axle and rear axle wheels of multi-axle commercial vehicles are not completely locked. Under the premise of ensuring the pressure increase, pressure build-up rate and target value, the working noise is reduced by controlling the pressure of the QEBS build-up chamber.

Description

A method for coordinated control of anti-lock braking pressure in a multi-axle commercial vehicle brake-by-wire system technical field The present invention relates to the technical field of brake-by-wire systems, in particular to a kind of anti-locking of a multi-axle commercial vehicle brake-by-wire system Dead pressure coordinated control method. Background technique [0002] The brake-by-wire system is the electronically controlled braking system, which is developed from the traditional hydraulic braking system, but is different from the traditional hydraulic braking system. The braking method is very different. The electronically controlled braking system replaces some of the original mechanical components with electronic components. An advanced mechatronic system that combines electronic and hydraulic systems. The electronically controlled braking system is mainly composed of electric It is composed of sub pedal, electronic control unit (ECU) and hydraulic actua...

AI Technical Summary

Problems solved by technology

[0003] However, the existing brake-by-wire system has the following disadvantages. First, the existing brake-by-wire system is based on a single-motor structure, which can only control one pressure target, but cannot control two pressure targets; secondly, the existing brake-by-wire system The interaction between the system and the anti-lock braking system does not involve target pressure, target pressure gradient, and road surface recognition status, resulting in a simple pressure coordination control logic, which is not conducive to controlling ABS noise and is not conducive to ABS degradation control

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