An engine system includes an engine, an intake line, an exhaust line, a turbocharger, a water-cooled intercooler, a high-pressure Exhaust Gas Recirculation (EGR) system which includes a high-pressure EGR line, a high-pressure EGR cooler, and a high-pressure EGR valve, a low-pressure EGR system which includes a low-pressure EGR line, and a low-pressure EGR cooler, a radiator which cools the coolant, a low-pressure EGR cooling line, an intercooler cooling line, a low-pressure EGR cooling valve, an intercooler cooling valve, an electric water pump, a driving information detector which detects driving information of a vehicle including an outside air temperature, a temperature of the intake gas supplied to the engine and a coolant temperature, and a controller which controls the low-pressure EGR cooling valve, the intercooler cooling valve, the high-pressure EGR valve and the electric water pump based on the driving information detected by the driving information detector.

A method of controlling exhaust gas recirculation (EGR) for controlling recirculation of exhaust gas discharged from a combustion chamber of an engine includes: a data obtaining operation of obtaining data about an engine state and a gas supply state; a current EGR rate calculating operation of calculating a current EGR rate of supply gas based on the data; a demand EGR rate setting operation of setting a demand EGR rate matched with the data in a pre-made target EGR rate map; an error calculating operation of calculating a difference between the demand EGR rate and the current EGR rate; and a control operation of making the current EGR rate follow the demand EGR rate by changing a recirculation rate of the exhaust gas by adjusting an inhalation side pressure of the supply gas according to the difference.

A method of controlling exhaust gas recirculation (EGR) for controlling recirculation of exhaust gas discharged from a combustion chamber of an engine includes: a data obtaining operation of obtaining data about an engine state and a gas supply state; a current EGR rate calculating operation of calculating a current EGR rate of supply gas based on the data; a demand EGR rate setting operation of setting a demand EGR rate matched with the data in a pre-made target EGR rate map; an error calculating operation of calculating a difference between the demand EGR rate and the current EGR rate; and a control operation of making the current EGR rate follow the demand EGR rate by changing a recirculation rate of the exhaust gas by adjusting an inhalation side pressure of the supply gas according to the difference.

The present invention relates to a control apparatus and method for an internal combustion engine including two fuel injection valves in the intake port of each cylinder. In the present invention, fuel injection from a first fuel injection valve is activated while fuel injection from a second fuel injection valve is temporarily stopped at the resumption of fuel injection from the deceleration fuel cut-off state in response to a decrease in the engine rotation speed. The amount of minimum fuel injection to each cylinder that ensures the accuracy of fuel measurement can be reduced, and fuel is injected from the first fuel injection valve in an amount equal to or greater than the amount of minimum fuel injection. Thus, fuel injection can be resumed at a lower engine speed than when fuel injection is resumed from the two fuel injection valves.

The present invention relates to a control apparatus and method for an internal combustion engine including two fuel injection valves in the intake port of each cylinder. In the present invention, fuel injection from a first fuel injection valve is activated while fuel injection from a second fuel injection valve is temporarily stopped at the resumption of fuel injection from the deceleration fuel cut-off state in response to a decrease in the engine rotation speed. The amount of minimum fuel injection to each cylinder that ensures the accuracy of fuel measurement can be reduced, and fuel is injected from the first fuel injection valve in an amount equal to or greater than the amount of minimum fuel injection. Thus, fuel injection can be resumed at a lower engine speed than when fuel injection is resumed from the two fuel injection valves.

There is provided an internal combustion engine control apparatus having an exhaust gas recirculation amount estimation unit that learns the relationship between an exhaust gas recirculation valve opening area calculated by an exhaust gas recirculation valve opening area calculation unit and an opening degree of the exhaust gas recirculation valve and estimates an recirculation amount of exhaust gas utilized in controlling an internal combustion engine, based on the relationship between the exhaust gas recirculation valve opening area and the opening degree of the exhaust gas recirculation valve.

There is provided an internal combustion engine control apparatus having an exhaust gas recirculation amount estimation unit that learns the relationship between an exhaust gas recirculation valve opening area calculated by an exhaust gas recirculation valve opening area calculation unit and an opening degree of the exhaust gas recirculation valve and estimates an recirculation amount of exhaust gas utilized in controlling an internal combustion engine, based on the relationship between the exhaust gas recirculation valve opening area and the opening degree of the exhaust gas recirculation valve.

The present disclosure relates to internal combustion engines. The teachings thereof may be embodied in methods and devices for actuating an exhaust gas recirculation valve of a forced-induction internal combustion engine with exhaust gas recirculation. A method for building up the charge pressure required to avoid a drop in torque may include: detecting an acceleration indicator; in response, providing an increased target value for an exhaust gas recirculation rate; measuring an instantaneous actual charge pressure; determining a setpoint exhaust gas recirculation rate based on the increased target value, the instantaneous setpoint charge pressure, and the instantaneous actual charge pressure; calculating a control signal using the determined setpoint exhaust gas recirculation rate; and delivering the control signal to the exhaust gas recirculation valve to change its opening state.

The purpose of the present invention is to provide an engine with reforming cylinders which are fuel reforming devices capable of supplying a reformed fuel according to the outputs of outputting cylinders. The engine is provided with the outputting cylinders for burning the fuel and the reforming cylinders which are the fuel reforming devices for reforming the fuel through the reciprocating motions of pistons. The amount of reformed fuel supplied to all the outputting cylinders is changed according to the outputs of the outputting cylinders while maintaining the amount of supplied fuel and the amount of suctioned gas, which are supplied into one reforming cylinder.

The purpose of the present invention is to provide an engine with reforming cylinders which are fuel reforming devices capable of supplying a reformed fuel according to the outputs of outputting cylinders. The engine is provided with the outputting cylinders for burning the fuel and the reforming cylinders which are the fuel reforming devices for reforming the fuel through the reciprocating motions of pistons. The amount of reformed fuel supplied to all the outputting cylinders is changed according to the outputs of the outputting cylinders while maintaining the amount of supplied fuel and the amount of suctioned gas, which are supplied into one reforming cylinder.