Control device, control method, control unit, and engine control unit

A control device comprising:

• predicted value-calculating means for calculating a predicted value of a value indicative of an output from a controlled object, based on a predictive algorithm at a predetermined predicted value calculation period;
• and
• control input-calculating means for calculating a control input to the controlled object so as to control the output from the controlled object according to the calculated predicted value, based on one of a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm at a predetermined control input calculation period shorter than the predetermined predicted value calculation period.

A control method comprising the steps of:

• calculating a deviation between an output from a controlled object and a predetermined target value at a predetermined deviation calculation period;
• and
• calculating a control input to the controlled object so as to converge the output from the controlled object to the target value, according to the calculated deviation, based on one of a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm at a predetermined control input calculation period shorter than the predetermined deviation calculation period.

A control method comprising the steps of:

• calculating a predicted value of a value indicative of an output from a controlled object, based on a predictive algorithm at a predetermined predicted value calculation period;
• and
• calculating a control input to the controlled object so as to control the output from the controlled object according to the calculated predicted value, based on one of a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm at a predetermined control input calculation period shorter than the predetermined predicted value calculation period.

A control unit including a control program for causing a computer to control a controlled object,

• wherein the control program causes the computer to calculate a deviation between an output from the controlled object and a predetermined target value at a predetermined deviation calculation period, and calculate a control input to the controlled object so as to converge the output from the controlled object to the target value, according to the calculated deviation, based on one of a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm at a predetermined control input calculation period shorter than the predetermined deviation calculation period.

A control unit including a control program for causing a computer to control a controlled object,

• wherein the control program causes the computer to calculate a predicted value of a value indicative of an output from the controlled object, based on a predictive algorithm at a predetermined predicted value calculation period, and calculate a control input to the controlled object so as to control the output from the controlled object according to the calculated predicted value, based on one of a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm at a predetermined control input calculation period shorter than the predetermined predicted value calculation period.

An engine control unit including a control program for causing a computer to control an internal combustion engine including a catalyst arranged in an exhaust passage thereof,

• wherein the control program causes the computer to detect a parameter indicative of an air-fuel ratio of exhaust gases on a downstream side of the catalyst arranged in the exhaust passage, calculate a deviation between the parameter and a predetermined target value at a predetermined deviation calculation period, calculate a target air-fuel ratio of a mixture to be supplied to the engine so as to converge the parameter to the predetermined target value, according to the calculated deviation, based on any one of a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm, at a predetermined air-fuel ratio calculation period shorter than the predetermined deviation calculation period, and control an air-fuel ratio of the mixture to be supplied to the engine, according to the calculated target air-fuel ratio.

An engine control unit including a control program for causing a computer to control an internal combustion engine including a catalyst arranged in an exhaust passage thereof,

• wherein the control program causes the computer to detect a parameter indicative of an air-fuel ratio of exhaust gases on a downstream side of the catalyst arranged in the exhaust passage, calculate a predicted value of a value indicative of the parameter, based on a predictive algorithm at a predetermined predicted value calculation period, calculate a target air-fuel ratio of a mixture to be supplied to the engine, for controlling the parameter according to the calculated predicted value, based on any one of a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm, at a predetermined air-fuel ratio calculation period shorter than the predetermined predicted value calculation period, and control an air-fuel ratio of the mixture to be supplied to the engine, according to the calculated target air-fuel ratio.