Non-disassembling engine dynamic fuel injection advance angle detection method

Abstract

The invention relates to an engine fuel injection advance angle detection method, and provides a non-disassembling engine dynamic fuel injection advance angle detection method. The non-disassembling engine dynamic fuel injection advance angle detection method comprises: firstly, on a fuel injection pump testbed, conducting the fuel injection law test on a fuel injection pump-high pressure fuel pipe-fuel injector system to be detected, and conducting the dynamic vibration test on the high pressure fuel pipe at the same time; processing the vibration signal of the high pressure fuel pipe and calibrating the vibration signal by using the tested fuel injection law, to obtain the corresponding relationship between the vibration signal and the fuel injection advance angle; and finally, after thecorresponding relationship of the vibration signal of the high pressure fuel pipe and the fuel injection advance angle is determined, conducting dynamic detection on the vibration signal of the highpressure fuel pipe in the real vehicle state, to realize the dynamic fuel injection advance angle detection of an engine the real vehicle state. The method realizes the accurate dynamic measurement ofthe fuel injection advance angle of the engine the real vehicle state, and realizes the measurement under the condition that the fuel system of the engine is not disassembled.

Description

technical field [0001] The present invention relates to a method for detecting an engine fuel injection advance angle, more specifically, to a method for detecting a dynamic fuel injection advance angle that does not disassemble an engine fuel injection system, and a detection method for a dynamic fuel injection advance angle of an engine based on oil pipe vibration signals method. Background technique [0002] The fuel injection advance angle of the engine refers to the crankshaft rotation angle corresponding to the distance from the top of the piston to the top dead center when the fuel injector opens and injects fuel into the cylinder. If the fuel injection advance angle is too small, it will cause severe engine afterburn, high fuel consumption rate, high exhaust temperature, and black smoke. If the fuel injection advance angle is too large, it will cause rough engine operation, unstable operation, increased mechanical load, and even cylinder scuffing; if the fuel inject...

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Problems solved by technology

[0004] The method of static detection of fuel supply advance angle can only measure the fuel supply advance angle of the engine under static conditions, and cannot reflect the fuel supply advance angle and fuel injection advance angle when the engine is actually running; while the method of dynamic detection of fuel supply advance angle, the serial method The detection method of the oil supply pressure sensor needs to disconnect the high-pressure oil pipe and install the pressure sensor, which cannot achieve non-disintegration measurement, and the series connection of the pressure sensor will affect the characteristics of the original high-pressure oil circuit, which will affect the fuel injection law; the clip type oil supply The pressure sensor can realize non-disintegration measurement, but this method has high requirements for the sensor and installation, and is not suitable for real vehicle testing of the engine

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