An EGR system (1) for an internal combustion engine E provided with a first EGR passage (10) for recirculating EGR gas to the downstream side of a compressor from the upstream side of a turbine (2a) of a turbo-charger (2) is provided with a second EGR pass...

In an exhaust gas recirculation device, when the engine is turned off, a valve 3 of EGR control valve is moved in a valve closing direction and stopped at a position beyond fully closed valve position by a given flap opening degree. In case that the valve ...

A control unit (40) for an exhaust gas recirculation control system (30) compares an actual intake air quantity GN with a predetermined quantity GNC1 when an engine (10) is in a stable idling state (steps S100,S110). Then, presuming there is a t endency fo...

An exhaust gas recirculation system connects an exhaust system of an internal combustion engine to a downstream side of a throttle valve of an intake system by an exhaust gas recirculation passage. The amount of an exhaust gas to be recirculated to the int...

In a cold condition before a warming-up completion in a diesel engine, when an engine power is less than a predetermined value, an air excess rate is controlled to a second air excess rate being smaller than a target air excess rate set after the warming-u...

Fuel injection amount is limited below an upper limit value so that the fuel injection amount is prevented from being excessive in relation to the intake air amount supplied to a diesel engine. When a throttle valve or an EGR valve is judged to be malfunct...

The fuel injection parameters of a diesel engine are chosen so that injection is completed at the latest possible crank shaft related angle and or so that the a pre-determined main injection commencement angle are such that the engine is operated in a requ...