Patent ID: 6173700
Filing Date: 2001-01-16
Classification: F02D

Abstract:
A controller for cylinder injection type injectors comprising:various types of sensors for detecting operating states of an internal combustion engine;control parameter calculation means for calculating control parameters, which are a fuel injection amount and a fuel injection period for supplying a fuel to each cylinder of the internal combustion engine, based on the detection results obtained by said various types of sensors;high voltage generation means for generating a high voltage power supply for supplying over-excitation currents necessary for initially opening valves of injector nozzles to injector coils based on the result of a calculation made by said control parameter calculation means;over-excitation signal generation means for defining predetermined time intervals for supplying the over-excitation currents to the injector coils;first switching means for supplying the over-excitation currents to the injector coils from said high voltage generation means based on the outputs of said over-excitation signal generation means;holding current generation means for generating holding currents which are necessary to hold the valves of the injector nozzles open and which are supplied to the injector coils after the over-excitation currents have been supplied;second switching means for supplying the holding currents to the injector coils from a battery based on the outputs of said holding current generation means;third switching means for breaking currents flowing through the injector coils in order to close the valves of the injector nozzles;current detection means, arranged at paths not admitting the flow of the over-excitation currents supplied from said high voltage generation means through said first switching means, for detecting currents flowing through the injector coils;over-current detection means for detecting excessively large currents flowing through the injector coils based on the detection results obtained by said current detection means; andfailure determination holding means for holding said third switching means at the disenergized states based on the detection results obtained by said over-current detection means.