Patent ID: 9074550
Filing Date: 2015-07-07
Classification: F02D,F02M

Abstract:
1. A fuel injection control system for an internal combustion engine in which fuel discharged from a low pressure fuel pump is supplied to a fuel injection valve with its pressure boosted by a high pressure fuel pump, comprising: a processing section that executes a lowering process of lowering feed pressure that is the discharge pressure of said low pressure fuel pump; a pressure sensor that measures the discharge pressure of said high pressure fuel pump; a control section that performs a proportional-integral control of the duty cycle of said high pressure fuel pump based on the difference between a target discharge pressure of said high pressure fuel pump and a measurement value of said pressure sensor; a stopping section that stops said lowering process with reference to a tendency of change in an integral term used in the proportional-integral control during the execution of said lowering process.