Air pressure environment simulation system and method at different altitudes for braking performance test

Abstract

The invention discloses a different-altitude air pressure environment simulation system for a brake performance test. The system comprises a brake system vacuum source, a one-way valve, and a vacuum booster and brake master cylinder assembly; the air exhaust end of the brake system vacuum source is connected with the output end of the one-way valve; the input end of the one-way valve is connectedwith the brake boosting air chamber of the vacuum booster and brake master cylinder assembly; the system further comprises a vacuum speed regulating device, a vacuum pressure regulating device and a vacuum degree monitoring device; the vacuum speed regulating device and the vacuum pressure regulating device are arranged on a pipeline between the air exhaust end of the brake system vacuum source and the output end of the one-way valve; the vacuum degree monitoring device is arranged on a pipeline between the input end of the one-way valve and the brake boosting air chamber of the vacuum boosterand brake master cylinder assembly; and the signal output end of the vacuum degree monitoring device is used for being connected with the vacuum degree signal input end of brake performance testing equipment. According to the system of the invention, whole vehicle braking performance of an environment where air pressure changes due to altitude change is simulated at the same place, and whole vehicle level dynamic and static performance tests are conveniently carried out.

Description

technical field [0001] The invention relates to the technical field of braking performance of automobile chassis, in particular to a system and method for simulating air pressure environments at different altitudes for testing braking performance. Background technique [0002] Vacuum booster and brake master cylinder assembly are widely used in the braking system of automobiles. After the automobile enters different altitudes, due to the thin air at different altitudes, the vacuum booster performance will decrease, and the performance will decrease more as the altitude increases. Braking performance at altitude is not representative of performance at different altitudes. In order to meet the necessary braking performance of vehicles driving at different altitudes, various automobile manufacturers need to carry out braking performance verification tests at different altitudes. Place the brake system components into the low-pressure chamber (vacuum chamber) of the laboratory,...

AI Technical Summary

Problems solved by technology

[0004] 1. Tests at different altitudes involve vehicle transportation, personnel travel, and test guarantees, resulting in high costs;

[0005] 2. The braking system needs to be adjusted repeatedly before it is finalized, and it needs to go to different altitudes many times;

[0006] 3. Technicians in low-altitude areas are prone to altitude sickness after going to plateau areas, and there are safety risks in the test process;

[0007] 4. There is no fixed test site due to altitude changes in different altitude areas, and the braking tests are all carried out on public roads, which poses safety risks

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