Relay valve and electronic parking brake system based on same

Abstract

The invention discloses a relay valve and an electronic paring brake system based on the same. The relay valve comprises a shell, a control piston, a valve body, a valve return spring and a plate valve. A control port is arranged at the upper portion of the shell. An exhaust port is formed in the lower portion of the shell. An air inlet is formed in one side of the shell, an air outlet is formed in the other side of the shell, the shell comprises a control air source acting air cavity and a brake working air cavity, the control air source acting air cavity is communicated with the control port, the upper end of the valve body controls connection and disconnection of the air outlet and the exhaust port, the lower end of the valve controls connection and disconnection of the air inlet and the air outlet, the lower part of the piston is controlled to tightly abut against a piston return spring, and the lower portion of the valve abuts against the valve return spring; when the piston is controlled to be at the uppermost end, the air outlet and the exhaust port are communicated; when the piston return spring is pressed and moved downwards, the air outlet and the air inlet are communicated. The relay valve is simple in structure, reliable in working and low in cost, and the electronic parking brake system is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of automobile brake system parts, in particular to a relay valve with simple structure, reliable operation and low cost and an electronic parking brake system based on the relay valve. Background technique [0002] At present, the pneumatic parking brake devices of medium and heavy vehicles mostly adopt the principle of "air break brake", which generates parking brake by exhausting the parking brake air chamber. In order to realize the parking brake and release the parking brake, solenoid valves, relay valves or combinations thereof are often used to complete the intake and exhaust operations. In the braking system of trucks, the relay valve is used to shorten the reaction time and release the braking time, and play the role of acceleration and quick release. [0003] Chinese invention patent application "140 relay valve" (application number: 201410485169.0, publication date: 2014.12.10) discloses a relay v...

AI Technical Summary

Problems solved by technology

Due to the redesign of the structure of the above-mentioned relay valve, the structure is relatively complicated and the production cost is high. At the same time, it has high requirements on the air tightness of the system. If there is an air leak in the gas circuit, it is easy to affect the normal operation of the relay valve. , the reliability needs to be improved

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