Pneumatic electric control braking system and braking method with fail-safe function

Abstract

The invention provides an air pressure electronic control braking system with fail safe defensive function and a braking method. The system cancels a existing front and back bridge relay valve air control structure in the air pressure electronic control braking system. By the outage return effect of a counterbalance valve, high pressure gas of a third gas holder is directly opened by controlling the second relay valve by the counterbalance valve, the high pressure gas of a third gas holder directly passes the second relay valve to reach four braking gas rooms of a front and back bridge; According to the technical scheme, the dependence of a proportion relay valve of the front bridge and a bridge control valve of the back bridge is low, the proportion relay valve of the front bridge and the bridge control valve of the back bridge does not need possess the air control function the cost of the system is lowered. Because a fail braking gas circuit in the braking system separates with a routine braking gas circuit, the error-tolerant rate is high when the proportion relay valve of the front bridge and the bridge control valve of the back bridge break down, and the stability of the lose efficacy braking is higher.

Description

technical field [0001] The invention belongs to the technical field of automobile brake systems, and more particularly relates to a pneumatic electric control brake system and a brake method with a failure protection function. Background technique [0002] Due to the large weight of commercial vehicles and the large braking torque required for braking, commercial vehicles are usually braked by air pressure brakes that can provide higher brake pressure. [0003] The traditional pneumatic braking system of commercial vehicles is usually composed of air compressor, air storage tank, relay valve, dual-chamber brake valve and other parts. The air inlet and the air outlet are connected, so that the high-pressure gas in the air storage tank enters the front and rear brake air chambers through the brake valve to realize the braking process of commercial vehicles. [0004] However, due to the compressibility of gas and other factors, the traditional air braking system has obvious br...

AI Technical Summary

Problems solved by technology

However, when the current pneumatic electronic control braking system fails to brake, the relay valves of the front and rear axles are pneumatically controlled to ensure service braking, which makes it more dependent on the relay valves of the front and rear axles, and requires The relay valves in the system have air control functions, so the relay valves on the front and rear axles need to have high stability, which increases the manufacturing and maintenance costs of the entire braking system, and the fault tolerance rate when the relay valves on the front and rear axles fail Poor, insufficient braking stability

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