Method of Measuring the Movement Law of Diesel Injector Needle Valve Based on Visualization Method

Abstract

The invention discloses a method and a device for measuring a diesel injector needle valve movement rule of a diesel engine based on a visualization method. A high-pressure common rail injecting system comprises a diesel filter oil tank, an oil tank, a low-pressure oil pump, a high-pressure oil pump, a fuel metering valve, a variable frequency motor, a pressure release valve, a common rail pipe, a common rail pressure sensor, a control computer, and an electric control oil injector with a transparent head part; and a data acquiring system includes a synchronous delay controller, a high-speed camera, a microscope lens, a nanosecond flashlight controller, a convex lens and a nanosecond flashlight. The lower end of a diesel engine nozzle is changed to a transparent material for directly observing the movement of a needle valve; and the high-speed camera captures the transient movement rule of the needle valve at higher shooting speed. The device not only can precisely measure the movement of the needle valve in the vertical direction, but also can measure the eccentric movement of the needle valve.

Description

technical field [0001] The invention belongs to the technical field of internal-combustion engine testing, and relates to a method for obtaining the law of needle valve movement through visualization of needle valve movement during fuel injection in a high-pressure common rail system of a diesel engine. Background technique [0002] Nowadays, high-pressure common rail fuel injection system is widely used in diesel engines, which can realize very high injection pressure, and can flexibly realize the adjustment of fuel injection pressure, fuel injection timing, fuel injection quantity, and fuel injection times. The electronically controlled fuel injector is the key component, and the needle valve lift is an important parameter of the electronically controlled fuel injector. Accurate measurement of it is of great significance for the simulation of electronically controlled fuel injection and the improvement of the performance of the diesel engine. [0003] The existing measurem...

AI Technical Summary

Problems solved by technology

[0003] The existing measurement methods mainly include the measurement based on the laser displacement sensor, etc., but it needs to introduce the laser displacement sensor into the injector body, the operation is more complicated, and this method can only measure the movement of the needle valve in the vertical direction, and cannot measure Eccentric movement of needle valve

Images