ESC (electronic stability control) hydraulic performance test method based on flow control

Abstract

The invention discloses an ESC (electronic stability control) hydraulic performance test method based on flow control, and relates to the technical filed of ESC system test. A stable pressuring device, pressure detection devices, a flow detection device, a simulated energy storage device, a simulated load device, a first stop valve, a second stop valve and a third stop valve are included; the pressure detection devices are arranged at an oil inlet and an oil outlet of a valve block, the flow detection device is arranged at the oil outlet, the stable pressuring device comprises a servo electriccylinder and a hydraulic cylinder, the first stop valve is connected between the hydraulic cylinder and the oil inlet, the inlet end of the simulated energy storage device communicates with the oil inlet, the outlet end of the simulation energy storage device is connected with the second stop valve, the inlet end of the simulated load device communicates with the oil outlet, and the outlet end ofthe simulated load device is connected with the third stop valve. According to the ESC, through the brake fluid flow of the valve block, the demand of precise control of the flow in the hydraulic performance test of the ESC system is met.

Description

technical field [0001] The invention relates to the technical field of ESC system testing, more specifically, it relates to a flow control-based ESC hydraulic performance testing method. Background technique [0002] Such as figure 1 As shown, the vehicle body stabilization system (ESC) is composed of a controller 13, a valve block 1, and a motor 14. There are two oil inlets 10 on the valve block 1, which communicate with the two chambers of the brake master cylinder respectively, and there are four other The oil outlet 11 communicates with the brake wheel cylinders of the four wheels respectively. The main working principle of ESC is to judge the stability of the vehicle based on driver input (brake pedal, steering wheel angle) and sensor signals (master cylinder pressure, wheel speed, acceleration, yaw rate). When the vehicle is approaching an unstable state, The ESC controls the solenoid valve and the motor 14 inside the valve block 1 to realize the independent control ...

AI Technical Summary

Problems solved by technology

The traditional test method is to control the pressure change of the brake fluid at both ends of the valve block, and estimate the average flow through the valve block according to the pressure change and the PV characteristics of the brake wheel cylinder end. This test method is subject to PV nonlinearity and pressure control. Influenced by factors such as errors, for a micro-flow system such as the automotive ESC system, the error is relatively large, and it is difficult to meet the needs of higher-precision hydraulic pressure adjustment. Therefore, there is room for improvement

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