Detection Method of Rotational Speed in Electronically Controlled Fuel Injection System for Diesel Engines

摘要

The present invention relates to a method of detecting the number of revolutions in an electronically controlled fuel injection system for a diesel engine, in which a sensing gear is connected to a camshaft of a fuel injection system, The waveform shaping circuit converts the waveform signal into a square wave signal and then inputs it to an external interrupt terminal of the microprocessor. The microprocessor converts the interrupt signal F_INTThe clock pulse F_CLKCounting_T), Obtaining an arbitrarily set count clock frequency F_CLK) And the maximum bit of the timer (B_MAX) Is multiplied by 60 to obtain the maximum pump rotation number N_PMAX) And the number of sensing gear teeth (G_N), And this value is divided by the number of counted clocks (C_T) To obtain a linearized rotational speed recognition data DEC.