Diesel fuel injection pump with signal rotor giving reference position and rotation position signals

摘要

In a fuel injection system incorporating a distribution type fuel injection pump, wherein the amount of fuel in each fuel injection is controlled by the time duration from the stoppage to the resumption of the venting or spilling of the pumping chamber, the time duration is electronically calculated according to engine rotational speed and accelerator pedal opening amount as a rotational angle of the crankshaft. The value of the rotational angle is divided by a unit rotational angle of the crankshaft, as detected by a signal pickup from a signal rotor which rotates with an input shaft of the pump to obtain a quotient of an integer and a fractional remainder, and the rotational angle is measured by first counting the number of times that the crankshaft rotates through successive unit rotational angles equal to the integer of the quotient and, secondly, by adding a time equal to the product of the fractional remainder and a unit time which is equal to the time for the crankshaft to rotate through the unit rotational angle at the current engine rotational speed.