Patent ID: 7370638
Filing Date: 2008-05-13
Classification: F02D,F02M

Abstract:
1. A fuel injection control system comprising: a fuel pump works to feed fuel; an accumulator in which the fuel fed from said fuel pump is to be accumulated at a given pressure; fuel injectors each of which works to inject the fuel supplied from said accumulator into one of cylinders of a multi-cylinder internal combustion engine; a fuel pressure sensor working to measure a pressure of the fuel in said accumulator; and a controller working to energize said fuel injectors to inject the fuel at a sequence of given injection timings into the cylinders of the engine and also to control an operation of said fuel pump to feed an amount of the fuel to said accumulator at a sequence of controlled times for compensating for an amount of the fuel which flows out of said accumulator to bring the pressure of the fuel in said accumulator, as measured by said fuel pressure sensor, into agreement with a target value under feedback control, said controller being designed to perform a diagnosis function to diagnose whether at least one of said fuel injectors has failed in operation or not, when it is determined that at least one of said fuel injectors has failed in operation, said controller altering a mode of the feedback control to decrease the amount of fuel fed from said fuel pump to said accumulator at one of the sequence of the controlled times which is at a selected interval away from one of the sequence of the injection timings at which the at least one of said fuel injectors is to be energized to inject the fuel into the engine.