Composite piston type proportional relay valve and control method of relay valve

Abstract

The invention discloses a composite piston type proportional relay valve and a control method. The relay valve comprises a valve body provided with a first valve cavity, a first piston performing linear motion in the first valve cavity, an electric control mechanism driving the first piston to perform linear motion, a valve seat performing linear motion in the first valve cavity, an air inlet valve and an air exhausting valve, wherein the first piston and the valve seat divides the first valve cavity into three air chambers including an output air chamber, an air supplying chamber and an air exhausting chamber, the output air chamber is communicated with a brake air chamber, the air supplying chamber is communicated with an air storage cylinder, and the air exhausting chamber is led to the atmospheric environment. When the electric control mechanism acts, the first piston is driven to perform linear motion, and air with the pressure matched with working current of the electric control mechanism is output to the brake air chamber through the output air chamber. An output port of the relay valve produces the air with the pressure matched with the working current of the electric control mechanism to the bake air chamber by accurately controlling the working current of the electric control mechanism, and accordingly a braking system can be accurately controlled.

Description

technical field [0001] The present invention relates to the technical field of automobile braking systems, in particular, to a composite piston-type proportional braking system suitable for electronic control systems (EBS), autonomous emergency braking (AEB) and adaptive cruise control (ACC) systems of commercial vehicles. A relay valve and a control method for the composite piston proportional relay valve. Background technique [0002] The braking system is the decisive device for the braking performance of the vehicle, and it is also one of the most important factors related to traffic safety. The proportional relay valve is the most complicated part of the commercial vehicle EBS system, and it is also the core component of the system. Its performance has an extremely important impact on the braking performance of the commercial vehicle EBS system. In addition, proportional relay valves can also be used as active brake actuation structures for driver assistance systems ...

AI Technical Summary

Problems solved by technology

This utility model adopts electric signal proportion to control the brake air pressure, which replaces the traditional air pressure control transmission process, so that the wheels of the car can be braked synchronously, but its structure is relatively complicated, the processing precision of parts is high, and the manufacturing cost is relatively high.

[0006] Generally speaking, most of the existing proportional relay valves adopt the conventional structure of the proportional pressure regulating air chamber connecting the proportional valve and the relay valve, and are designed based on the drive anti-skid system (ASR) and EBS, which cannot solve all the problems for trucks. There is the problem of slow braking, or because of the complex design structure, there are problems of complicated manufacturing and installation and high cost; at the same time, there are defects such as loud noise, poor air tightness, and unstable output air pressure during work.

Therefore, these proportional relay valves are difficult to meet the needs of vehicles for normal and efficient working performance of relay valves

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