Common Rail Injector Assembly Nozzle Needle Valve Lift Measurement Method and Hall Sensor Probe

Abstract

The invention provides a common-rail oil sprayer assembly oil nozzle needle valve lift range measuring method. A guide face of a needle valve is provided with an annual groove. A Hall sensor probe is installed in a mounting hole in the side wall of a needle valve body, and the circular-arc end face at the end of the Hall sensor probe faces the needle valve guide face. The center of the Hall sensor probe is aligned with the upper edge or the lower edge of the needle valve annular groove and is set as the zero point position. When a needle valve moves up and down, the upper edge or the lower edge of the annular groove is perpendicular to a cutting magnetic line. The Hall sensor probe outputs needle valve displacement signals. The invention further provides the Hall sensor probe. The common-rail oil sprayer assembly oil nozzle needle valve lift range measuring method and the Hall sensor probe have the advantages that an oil nozzle needle valve lift range-time curve can be directly measured in the working process of an oil sprayer; a sensor structure is attached to the needle valve, and the working feature of the oil sprayer is not affected; measuring accuracy is improved through the mounting mode of a sensor, and the measuring error caused by the measuring distance deviation between the sensor and the needle valve.

Description

technical field [0001] The invention relates to the measurement technology in the design and development process of the fuel injector, in particular to a method for measuring the lift of the needle valve of the nozzle and the used Hall sensor measuring head. Background technique [0002] The injection law of common rail diesel engine has a direct impact on the economy, power and emission of the diesel engine. The needle valve lift is an important parameter for studying the injection law of common rail injector, and it is also one of the key parameters for design matching. The needle valve lift sensor is a small displacement sensor with high frequency response (range 0-1.0mm), which is mainly used to measure the opening and closing state of the needle valve. Qualitative measurement and analysis of injector needle valve lift, opening delay, closing delay, motion state, etc., to understand the motion of the common rail injector nozzle in actual work, has very important practica...

AI Technical Summary

Problems solved by technology

[0004] The traditional Hall displacement sensor is installed on the axial end face of the needle valve or control piston, which cannot be installed on the common rail injector, and cannot directly measure the needle valve lift of the common rail injector, and the common rail injector The lift range of the needle valve is small, and the precision of the traditional displacement sensor is not enough

[0005] Due to the high working pressure of 200MPa of the common rail injector and the compact structure of the nozzle, it is very difficult to install a small and high-pressure resistant sensor on the nozzle end. At present, there is no ready-made sensor that can be used to measure the electromagnet of the oil pump. We choose the linear sensor. chip processing and packaging

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