Engine Control System

摘要

The purpose of the present invention is to provide an engine control system that is capable of promoting mixing of fuel and air during exhaust gas recirculation, thereby suppressing combustion fluctuation of a gasoline engine, such that efficiency and exhaust gas purification can be simultaneously achieved. The engine control system controls an engine and is equipped with an injection device for injecting fuel directly into a cylinder and a recirculation device for recirculating exhaust gas to the intake side. When the temperature of the recirculating exhaust gas recirculated by the recirculation device is high as opposed to when the temperature is low, or when the amount of the recirculating exhaust gas recirculated by the recirculation device is large as opposed to when the amount is small, at least one of the following is executed: advancing of the fuel injection timing (IT_SP (n−2) of the injection device; increasing of the fuel pressure (FP) to be supplied to the injection device; reducing the frequency (n) of divided multi-stage injection to be performed by the injection device during the period between intake top dead center and compression top dead center; and reducing of the interval of divided multi-stage injection (IT_RE (n−2)).

主权项

1. An engine control system for controlling an engine, the engine control system comprising an injection device which injects fuel directly into a cylinder, and a recirculation device which recirculates exhaust gas to an intake side, wherein
when the temperature of the recirculating exhaust gas to be recirculated by the recirculation device is high as opposed to when the temperature is low, or when the amount of the recirculating exhaust gas to be recirculated by the recirculation device is large as opposed to when the amount is small, the engine control system executes at least one of advancing a fuel injection timing of the injection device, increasing the pressure of fuel to be supplied to the injection device, reducing the frequency of divided multi-stage injection of the injection device during a period from intake top dead center and compression top dead center, and reducing the interval of the divided multi-stage injection.