Automobile air brake system adhesion coefficient utilization rate test device and method

Abstract

The invention relates to the technical field of automobile test devices, and discloses an automobile air brake system adhesion coefficient utilization rate test device and method. The test device comprises an air inlet selection valve, a pipeline cut-off valve, an electromagnetic switch valve, an electric pressure regulating valve, a first pressure release valve, a second pressure release valve and an air outlet selection valve, wherein the air inlet selection valve is provided with a first air inlet, a second air inlet and a first air outlet; the first air inlet can be used for being connected with an original automobile pipeline of an automobile brake system, and the second air inlet can be used for being connected with an air tank; the pipeline cut-off valve is provided with a third airinlet, a second air outlet and a third air outlet; the third air inlet is communicated with the first air outlet;theair outlet selection valve is provided with a fourth air inlet, a fifth air inlet and a fourth air outlet; the fourth air inlet is communicated with the first pressure release valve; the fifth air inlet is communicated with the second pressure release valve; and the fourth air outlet can be used for being connected with an air chamber. The device has the advantages that the test device is simple, multiple in functions and high in test efficiency; the electric pressure regulatingvalve can be manually and electrically regulated, and is convenient to regulate and high in regulating precision.

Description

technical field [0001] The invention relates to the technical field of automobile test devices, in particular to a device and method for testing the utilization rate of adhesion coefficient of an automobile air pressure braking system. Background technique [0002] Automobile anti-lock braking system (ABS) is an effective vehicle safety device, which makes the wheels in a stable state by automatically adjusting the pressure during the braking process, thereby greatly improving the steering ability and direction during the braking process of the car stability. The adhesion coefficient utilization rate is one of the important evaluation indicators of the automobile anti-lock braking system. The adhesion coefficient utilization rate test needs to find the critical point between the locked and non-locked wheels of the car, and measure it in this state. Substituting the braking data into the formula to calculate the adhesion coefficient utilization rate. [0003] In the coeffic...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: the data repeatability is poor, so it is also improved by placing a limit device under the brake pedal

Another improved method is to connect a manual pressure-regulating proportional valve in series in the brake pipeline. In this method, the data repeatability is better after adjusting to the critical point, but its disadvantage is that it takes a long time to find the critical point, It is necessary for the test personnel to stop multiple times and drill under the vehicle for adjustment. Since different test sites have different requirements for entering and exiting the site, some vehicles do not have the conditions to drill under the vehicle, so they need to go out to the trench or lift to adjust; And this pressure regulating method still exists, it is easy to occur that the pressure of the brake chamber cannot be fully released, and the residual pressure needs to be manually released after parking; The structure is difficult to meet the high demands of the test process

It can be seen that the existing air pressure brake system adhesion coefficient utilization rate test device is unreasonably set up, has a single function, requires high technology and experience for the test personnel, and the test process is cumbersome, and the test efficiency and test accuracy are not high.

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