METHOD FOR MEASURING FUEL INJECTION TIMING AND FUEL INJECTION PERIOD OF INTERNAL COMBUSTION ENGINE AND APPARATUS FOR MEASURING FUEL INJECTION TIMING AND FUEL INJECTION PERIOD OF INTERNAL COMBUSTION ENGINE

摘要

The present invention provides a method for measuring the fuel injection timing and fuel injection period of an internal combustion engine and an apparatus for measuring the fuel injection timing and fuel injection period of an internal combustion engine. The method for measuring the fuel injection timing and fuel injection period of an internal combustion engine according to the present invention comprises the steps of: certifying, on a reference clock, an information signal about the rotational state of an engine extracted from the position signals of a cam and a crank and the operational signal of an injector detected from an engine control unit to control the operation of the injector; and calculating the start point or end point of injecting fuel through the injector by measuring the position of the operational signal of the injector with respect to the information signal about the rotational state of the engine on the reference clock.;COPYRIGHT KIPO 2014;[Reference numerals] (AA) Start; (BB) End; (S100) Provide a reference clock; (S210) Detect the operating positions of a cam and a crank using a position sensor; (S220) Certify the detected operating positions of the cam and the crank on the reference clock as position signals; (S310) Certify the position of an administrative division signal from the operating position of the cam in the shape of continuous signals; (S320) Certify the position of a reference pulse signal from the operating position of the crank in the shape of continuous signals; (S330) Calculate a compression top dead point of time from the position of the reference pulse signal and the position of the administrative division signal; (S340) Certify the compression top dead point of time on the reference clock; (S410) Detect the operating state of an injector from an engine control unit; (S420) Certify the operating state of the injector as the operating signal of the injector on the reference clock; (S510) Compare and calculate the position of the operating signal of the injector with respect to the position of the compression top dead point of time based on the preset position signal of the crank; (S520) Judge the start point and end point of spraying fuel through the injector; (S600) Calculate a fuel spray point of time and fuel spray time; (S700) Analyze the fuel spray point of time and the fuel spray time which have been calculated repeatedly