Multi-axle commercial vehicle brake-by-wire system anti-lock pressure coordination control method

Abstract

The invention discloses a multi-axle commercial vehicle brake-by-wire system anti-lock pressure coordination control method which comprises the following steps: S1, according to the travel of a brake pedal, calculating the pressure of an oil outlet 1, the pressure of an oil outlet 2 and the pressure of two independent pressure buildup modules QEBS; and S2, ABS data is received, wherein the ABS data comprises parameters of Pwh, Preq, dpreq, plstMax, fgh2l and fgl2h, an ABS activation state and an ABS fault state. According to the method, more reasonable pressure building cavity pressure control under the working condition of the ABS is achieved based on the current target pressure of the ABS, the target pressure gradient requirement, the maximum pressure value of the last pressurization cycle of the ABS and QEBS coordinated pressure target algorithm logic of a butt joint road surface recognition mark; when an ABS valve / motor fails, two paths of pressure output capacity are output through the QEBS, on the premise that needed braking force is kept, when incomplete locking and anti-locking control over wheels of a middle axle and a rear axle of the multi-axle commercial vehicle is achieved, and on the premise that pressurization and pressure buildup rates and target values are guaranteed, working noise is reduced by controlling the pressure of a pressure buildup cavity of the QEBS.

Description

technical field [0001] The invention relates to the technical field of brake-by-wire systems, in particular to an anti-lock pressure coordinated control method for a multi-axle commercial vehicle brake-by-wire system. Background technique [0002] The brake-by-wire system is an electronically controlled braking system, developed from the traditional hydraulic braking system, but it is very different from the traditional braking method. The electronically controlled braking system replaces some of the original mechanical components with electronic components. , is an advanced mechatronics system that combines electronic and hydraulic systems. The electronically controlled braking system is mainly composed of electronic pedals, electronic control unit (ECU), and hydraulic actuators. [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 press...

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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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