Patent ID: 7156078
Filing Date: 2007-01-02
Classification: F02D

Abstract:
1. A fuel injection control device comprising: a plurality of injectors for injecting fuel into an internal combustion engine; a fuel pressure sensor for detecting a pressure of fuel supplied to the plurality of injectors; various sensors for detecting operation states of the internal combustion engine; and a fuel supply control portion for calculating an amount of fuel supply based on a signal from the fuel pressure sensor and signals from the various sensors and for performing driving control of the plurality of injectors, wherein the fuel supply control portion comprises: injector-valve opening signal generating means for calculating an amount of fuel supply based on the signals from the various sensors and for outputting an injector-valve opening signal for the plurality of injectors; a first driving current supply signal generating means for setting a first driving current supply time period, in which a first driving current is supplied during an injector-valve opening time period, based on the signal from the fuel pressure sensor and for outputting a first driving current supply signal; a first driving current supplying means for supplying the first driving current to the plurality of injectors based on the injector-valve opening signal from the injector-valve opening signal generating means and the first driving current supply signal from the first driving current supply signal generating means; a second driving current supplying means for supplying a second driving current, which is smaller than the first driving current, to the plurality of injectors based on the injector-valve opening signal from the injector-valve opening signal generating means after the first driving current has been supplied to the plurality of injectors; and fuel pressure sensor malfunction detecting means for detecting a malfunction in the fuel pressure sensor based on a signal from the fuel pressure sensor, and wherein the first driving current supply signal generating means sets the first driving current supply time period to a predetermined fixed time period in a case where the fuel pressure sensor malfunction detecting means has detected a malfunction in the fuel pressure sensor.