Patent ID: 9284907
Filing Date: 2016-03-15
CPC Classification: F02D

Claim Text:
1. A fuel pump control apparatus of an engine, comprising: an operation condition detection portion that detects an operation condition of the engine; a motorized fuel pump furnished with a fuel pressure regulation function; an injector that supplies the engine with fuel according to a fuel pressure supplied from the motorized fuel pump; a power generation portion that generates power by manual rotational driving of a crank shaft of the engine; and a control portion that is activated by a voltage generated by the power generation portion and computes an amount of fuel to be injected and calculates a fuel pump driving duty according to a detected value from the operation condition detection portion, wherein the control portion includes: an injector injection amount calculation functioning portion that calculates an amount of injector injection to be supplied to the engine according to the operation condition of the engine; a fuel consumption amount calculation functioning portion that calculates an amount of fuel the engine is consuming on a basis of the amount of injector injection, a number of cylinders of the engine, and an engine rotation speed of the engine; a pump driving fuel amount calculation functioning portion that calculates an amount of fuel to drive the motorized fuel pump on a basis of an output of the fuel consumption amount calculation functioning portion; a target motor speed calculation functioning portion that calculates a target motor speed on a basis of an output of the pump driving fuel amount calculation functioning portion; a driving duty calculation functioning portion that calculates the fuel pump driving duty indicating time periods during which the motorized fuel pump is driven, on a basis of an output of the target motor speed calculation functioning portion; and a feedback (F/B) correction value calculation functioning portion that finds a deviation between an actual motor speed detected from the motorized fuel pump and the target motor speed and calculates a F/B correction value of the fuel pump driving duty so that the deviation is eliminated, wherein: in a case where a state in which the operation condition of the engine is stable for a predetermined time period or longer and the F/B correction value is stable without yielding the deviation between the actual motor speed and the target motor speed for the predetermined time period or longer, the control portion learns the F/B correction value and stores the F/B correction value in a memory region in the control portion, so that when the control portion is activated a next time after the predetermined time period elapses, the control portion starts control by correcting the fuel pump driving duty with the stored, learned F/B correction value in addition to a subsequent F/B correction value calculated when the control portion is activated the next time.