Device and method for measuring spool displacement based on laser displacement sensor

Abstract

The invention discloses a valve core displacement measurement device based on a laser displacement sensor. The valve core displacement measurement device comprises a valve core displacement test bench and a signal acquisition and processing device. The valve core displacement test bench comprises a fixed support and an adjustable support. The signal acquisition and processing device comprises the laser displacement sensor (14), a signal amplifier and a computer. The laser displacement sensor (14) is connected with the signal amplifier and the computer so as to establish a signal transmission channel. The signal amplifier transmits the signals acquired by the laser displacement sensor (14) to the computer through signal amplification. The signals are processed in the computer so that the required digital signals are obtained, and the valve core displacement is determined by the digital signals. The valve core displacement can be directly measured so that the measurement accuracy can be enhanced.

Description

technical field [0001] The invention belongs to the displacement measurement technology of a solenoid valve core, in particular to a device and a method for measuring the displacement of a valve core in a hydraulic control unit of an active safety system of an automobile. Background technique [0002] As an important part of the vehicle dynamics control system, the hydraulic control unit has higher and higher application requirements. In the transient high-frequency brake pressure control process required in active safety systems, accurate linear control of the brake pressure on the hydraulic control unit can greatly improve the performance of the brake system and reduce noise and braking in the hydraulic control unit. Disk vibration. The displacement value of the booster valve is an important feedback quantity in the linear control system. Therefore, the solenoid valve spool displacement measuring device that can accurately obtain the displacement of the booster valve spoo...

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Problems solved by technology

For example, the method disclosed in the patent No. CN1587893A measures the displacement of the valve core through the method of high-voltage eddy current displacement sensor, which needs to destroy the structure of the valve body itself, which will have a certain impact on the performance of the valve, and the cost is relatively expensive.

The high-pressure pilot-operated pneumatic solenoid valve spool displacement measuring device and method disclosed in Patent No. CN103438807A mainly uses a laser displacement sensor to measure the spool displacement transmission device to obtain the spool displacement, but this method causes relatively large resistance to the spool. It also has a certain impact on the performance of the valve and cannot achieve high-precision measurement

The automatic detection device and method for solenoid valve core displacement disclosed in Patent No. CN102692200A uses a probe to measure the displacement of the valve core, but considering that the valve has no sealing structure, it is impossible to measure the displacement of the valve core in other types of valves

[0004] Therefore, for the high-speed switching valve in the hydraulic control unit, because the valve core is sealed in the valve body, it is difficult to measure the displacement of the valve core. At present, there is no relatively mature equipment and method for measurement.

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