Control system of internal combustion engine

摘要

The present invention provides a control system for an internal combustion engine capable of, in a case where fuel is injected from an injector for a plurality of times in a divided manner based on an operation status of the internal combustion engine, controlling an injection quantity of the injector accurately in light of variation in an injection quantity of the injector based on air-fuel ratio accuracy, while preventing performance deterioration of the internal combustion engine caused by the injection of fuel. An internal combustion engine control system of the present invention includes an injector for making a valve operate and injecting fuel by applying an excitation current to a coil and injecting fuel into a combustion chamber directly in a manner dividing into a plurality of times of fuel injection, the internal combustion engine control system includes means for determining invalid and valid pulse widths of the injector.

主权项

1. A control system of an internal combustion engine having an injector for making a valve operate and inject fuel by applying an excitation current to a coil, and injecting the fuel directly to a combustion chamber,
the control system comprising: air-fuel ratio detecting means for detecting an air-fuel ratio of the internal combustion engine; operation status detecting means for detecting an operation status of the internal combustion engine; injection count setting means for setting a fuel injection count based on the operation status of the internal combustion engine detected by the operation status detecting means; driving control means for performing driving control of a pulse width of the excitation current for valve-opening driving the injector; and pulse width learning means for learning the pulse width; the driving control means calculating a valid pulse width corresponding to a fuel injection quantity injected into the combustion chamber and an invalid pulse width corresponding to a valve opening delay and a valve closing delay of the injector; the pulse width learning means learning, based on the operation status of the internal combustion engine, an amount of change in the air-fuel ratio, which occurs as a result of a change in the fuel injection count, as the invalid pulse width, and maintaining the amount of change in the air-fuel ratio as a constant invalid pulse width until a further change in the fuel injection count; and the injector injecting the fuel directly to the combustion chamber based upon the valid pulse width and the invalid pulse width.