Control apparatus, control method, control unit, and engine control unit

A control apparatus comprising:

• reference input-calculating means for calculating a reference input;
• modulation output-calculating means for inputting the calculated reference input to a ΔΣ modulation algorithm, thereby calculating a modulation output as an output from the ΔΣ modulation algorithm;
• and
• control input-calculating means for calculating a control input to the controlled object according to the calculated modulation output,
• wherein said modulation output-calculating means includes limiting means for limiting an integral of an input deviation which is a deviation between the reference input and the modulation output, in the ΔΣ modulation algorithm, to a value within a predetermined limited range.

A control apparatus for an internal combustion engine including an exhaust passage through which exhaust gases flow, comprising:

• an air-fuel ratio sensor for outputting a detection signal indicative of an air-fuel ratio of the exhaust gases flowing through the exhaust passage;
• reference input-calculating means for calculating a reference input based on an output deviation which is a deviation between the output from said air-fuel ratio sensor and a predetermined target value;
• limiting value-calculating means for calculating a limiting value for limiting the reference input;
• modulation output-calculating means for inputting the calculated limiting value to one of a ΔΣ modulation algorithm and a ΣΔ modulation algorithm, thereby calculating a modulation output as an output from the one of the modulation algorithms;
• and
• air-fuel ratio control means for controlling an air-fuel ratio of a mixture supplied to the engine, according to the calculated modulation output, such that the output from said air-fuel ratio sensor converges to the target value,
• wherein said limiting value-calculating means sets the limiting value to a value which is identical in sign to the reference input and equal in absolute value to the modulation output when the absolute value of the reference input is larger than the absolute value of the modulation output, and to a value which is equal to the reference input when the absolute value of the reference input is equal to or smaller than the absolute value of the modulation output.

A control apparatus for an internal combustion engine including an exhaust passage through which exhaust gases flow, comprising:

• an air-fuel ratio sensor for outputting a detection signal indicative of an air-fuel ratio of the exhaust gases flowing through the exhaust passage;
• reference input-calculating means for calculating a reference input based on an output deviation which is a deviation between the output from said air-fuel ratio sensor and a predetermined target value;
• modulation output-calculating means for inputting the calculated reference input to a ΔΣ modulation algorithm, thereby calculating a modulation output as an output from the ΔΣ modulation algorithm;
• and
• air-fuel ratio control means for controlling an air-fuel ratio of a mixture supplied to the engine according to the calculated modulation output such that the output from said air-fuel ratio sensor converges to the target value,
• wherein said modulation output-calculating means includes limiting means for limiting an integral of the input deviation between the reference input and the modulation output, in the ΔΣ modulation algorithm, to a value within a predetermined limited range.

A control method of controlling a controlled object, comprising:

• a reference input-calculating step of calculating a reference input;
• a limiting value-calculating step of calculating a limiting value for limiting the reference input;
• a modulation output-calculating step of inputting the calculated limiting value to one of a ΔΣ modulation algorithm and a ΣΔ modulation algorithm, thereby calculating a modulation output as an output from the one of the modulation algorithms;
• and
• a control input-calculating step of calculating a control input to the controlled object according to the calculated modulation output,
• wherein said limiting value-calculating step includes setting the limiting value to a value which is identical in sign to the reference input and equal in absolute value to the modulation output when the absolute value of the reference input is larger than the absolute value of the modulation output, and to a value which is equal to the reference input when the absolute value of the reference input is equal to or smaller than the absolute value of the modulation output.

A control method of controlling a controlled object, comprising:

• a reference input-calculating step of calculating a reference input;
• a modulation output-calculating step of inputting the calculated reference input to a ΔΣ modulation algorithm, thereby calculating a modulation output as an output from the ΔΣ modulation algorithm;
• and
• a control input-calculating step of calculating a control input to the controlled object according to the calculated modulation output,
• wherein said modulation output-calculating step includes a limiting step of limiting an integral of an input deviation which is a deviation between the reference input and the modulation output, in the ΔΣ modulation algorithm, to a value within a predetermined limited range.

A control method of controlling an internal combustion engine including an exhaust passage through which exhaust gases flow,

• the method comprising:
• an air-fuel ratio-detecting step of detecting an air-fuel ratio of the exhaust gases flowing through the exhaust passage;
• a reference input-calculating step of calculating a reference input based on an output deviation which is a deviation between the detected air-fuel ratio and a predetermined target value;
• a limiting value-calculating step of calculating a limiting value for limiting the reference input;
• a modulation output-calculating step of inputting the calculated limiting value to one of a ΔΣ modulation algorithm and a ΣΔ modulation algorithm, thereby calculating a modulation output as an output from the one of the modulation algorithms;
• and
• an air-fuel ratio control step of controlling an air-fuel ratio of a mixture supplied to the engine such that the detected air-fuel ratio converges to the target value,
• wherein said limiting value-calculating step include setting the limiting value to a value which is identical in sign to the reference input and equal in absolute value to the modulation output when the absolute value of the reference input is larger than the absolute value of the modulation output, and to a value which is equal to the reference input when the absolute value of the reference input is equal to or smaller than the absolute value of the modulation output.

A control method of controlling an internal combustion engine including an exhaust passage through which exhaust gases flow,

• the method comprising:
• an air-fuel ratio-detecting step of detecting an air-fuel ratio of the exhaust gases flowing through the exhaust passage;
• a reference input-calculating step of calculating a reference input based on an output deviation which is a deviation between the detected air-fuel ratio and a predetermined target value;
• a modulation output-calculating step of inputting the calculated reference input to a ΔΣ modulation algorithm, thereby calculating a modulation output as an output from the ΔΣ modulation algorithm;
• and
• an air-fuel ratio control step of controlling an air-fuel ratio of a mixture supplied to the engine according to the calculated modulation output such that the detected air-fuel ratio converges to the target value,
• wherein said modulation output-calculating step includes a limiting step of limiting an integral of an input deviation between the reference input and the modulation output, in the ΔΣ modulation algorithm, to a value within a predetermined limited range.

An engine control unit including a control program for causing the computer to control an internal combustion engine including an exhaust passage through which exhaust gases flow,

• wherein the control program causes the computer to detect an air-fuel ratio of the exhaust gases flowing through the exhaust passage, calculate a reference input based on an output deviation which is a deviation between the detected air-fuel ratio and a predetermined target value, calculate a limiting value for limiting the reference input, input the calculated limiting value to one of a ΔΣ modulation algorithm and a ΣΔ modulation algorithm, to thereby calculate a modulation output as an output from the one of the modulation algorithms, and control an air-fuel ratio of a mixture supplied to the engine such that the detected air-fuel ratio converges to the target value, and
• wherein when the control program causes the computer to calculate the limiting value, the control program causes the computer to set the limiting value to a value which is identical in sign to the reference input and equal in absolute value to the modulation output when the absolute value of the reference input is larger than the absolute value of the modulation output, and to a value which is equal to the reference input when the absolute value of the reference input is equal to or smaller than the absolute value of the modulation output.