Control system for internal combustion engine

A control system for an internal combustion engine provided with a turbocharger having a compressor wheel for pressurizing intake air of the engine and a turbine wheel connected with the compressor wheel and rotationally driven by kinetic energy of exhaust gases discharged from the engine, exhaust gas flow rate changing means for changing a flow rate of exhaust gases injected to the turbine wheel, an exhaust gas recirculation passage for recirculating the exhaust gases to an intake pipe of the engine, an exhaust gas recirculation control valve disposed in the exhaust gas recirculation passage, and a throttle valve disposed in the intake pipe, the control system comprising:

• exhaust pressure detecting means for detecting an exhaust pressure in an exhaust pipe of the engine;
• intake pipe gas parameter obtaining means for obtaining values of intake pipe gas parameters indicating a state of gases in the intake pipe;
• first target value calculating means for calculating a target value of the exhaust pressure;
• second target value calculating means for calculating target values of the intake pipe gas parameters;
• and
• gas control means for calculating a control amount of the exhaust gas flow rate changing means, an opening control amount of the exhaust gas recirculation control valve, and an opening control amount of the throttle valve using a model predictive control, so that values of the detected exhaust pressure and the intake pipe gas parameters, respectively, coincide with the target values of the exhaust pressure and the intake pipe gas parameters.

A control method for an internal combustion engine provided with a turbocharger having a compressor wheel for pressurizing intake air of the engine and a turbine wheel connected with the compressor wheel and rotationally driven by kinetic energy of exhaust gases from the engine, an exhaust gas flow rate changing device for changing a flow rate of exhaust gases injected to the turbine wheel, an exhaust gas recirculation passage for recirculating the exhaust gases to an intake pipe of the engine, and an exhaust gas recirculation control valve disposed in the exhaust gas recirculation passage, the control method comprising the steps of:

• a) detecting an exhaust pressure in an exhaust pipe of the engine;
• b) obtaining a value of an intake pipe gas parameter indicating a state of gases in the intake pipe;
• c) calculating a target value of the exhaust pressure;
• d) calculating a target value of the intake pipe gas parameter;
• and
• e) calculating a control amount of the exhaust gas flow rate changing device and an opening control amount of the exhaust gas recirculation control valve using a model predictive control, so that values of the detected exhaust pressure and the intake pipe gas parameter, respectively, coincide with the target values of the exhaust pressure and the intake pipe gas parameter.

A control method for an internal combustion engine provided with a turbocharger having a compressor wheel for pressurizing intake air of the engine and a turbine wheel connected with the compressor wheel and rotationally driven by kinetic energy of exhaust gases from the engine, an exhaust gas flow rate changing device for changing a flow rate of exhaust gases injected to the turbine wheel, an exhaust gas recirculation passage for recirculating the exhaust gases to an intake pipe of the engine, an exhaust gas recirculation control valve disposed in the exhaust gas recirculation passage, and a throttle valve disposed in the intake pipe, the control method comprising the steps of:

• a) detecting an exhaust pressure in an exhaust pipe of the engine;
• b) obtaining values of intake pipe gas parameters indicating a state of gases in the intake pipe;
• c) calculating a target value of the exhaust pressure;
• d) calculating target values of the intake pipe gas parameters;
• and
• e) calculating a control amount of the exhaust gas flow rate changing device, an opening control amount of the exhaust gas recirculation control valve, and an opening control amount of the throttle valve using a model predictive control, so that values of the detected exhaust pressure and the intake pipe gas parameters, respectively, coincide with the target values of the exhaust pressure and the intake pipe gas parameters.

A computer program embodied on a computer-readable medium, for causing a computer to implement a control method for an internal combustion engine provided with a turbocharger having a compressor wheel for pressurizing intake air of the engine and a turbine wheel connected with the compressor wheel and rotationally driven by kinetic energy of exhaust gases from the engine, exhaust gas flow rate changing device for changing a flow rate of exhaust gases injected to the turbine wheel, an exhaust gas recirculation passage for recirculating the exhaust gases to an intake pipe of the engine, an exhaust gas recirculation control valve disposed in the exhaust gas recirculation passage, and a throttle valve disposed in the intake pipe, the control method comprising the steps of:

• a) detecting an exhaust pressure in an exhaust pipe of the engine;
• b) obtaining values of intake pipe gas parameters indicating a state of gases in the intake pipe;
• c) calculating a target value of the exhaust pressure;
• d) calculating target values of the intake pipe gas parameters;
• and
• e) calculating a control amount of the exhaust gas flow rate changing device, an opening control amount of the exhaust gas recirculation control valve, and an opening control amount of the throttle valve using a model predictive control, so that values of the detected exhaust pressure and the intake pipe gas parameters, respectively, coincide with the target values of the exhaust pressure and the intake pipe gas parameters.

A computer program embodied on a computer-readable medium, for causing a computer to implement a control method for an internal combustion engine provided with a turbocharger having a compressor wheel for pressurizing intake air of the engine and a turbine wheel connected with the compressor wheel and rotationally driven by kinetic energy of exhaust gases from the engine, an exhaust gas flow rate changing device for changing a flow rate of exhaust gases injected to the turbine wheel, an exhaust gas recirculation passage for recirculating the exhaust gases to an intake pipe of the engine, and an exhaust gas recirculation control valve disposed in the exhaust gas recirculation passage, the control method comprising the steps of:

• a) detecting an exhaust pressure in an exhaust pipe of the engine;
• b) obtaining a value of an intake pipe gas parameter indicating a state of gases in the intake pipe;
• c) calculating a target value of the exhaust pressure;
• d) calculating a target value of the intake pipe gas parameter;
• and
• e) calculating a control amount of the exhaust gas flow rate changing device and an opening control amount of the exhaust gas recirculation control valve using a model predictive control, so that values of the detected exhaust pressure and the intake pipe gas parameter, respectively, coincide with the target values of the exhaust pressure and the intake pipe gas parameter.