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US 6,925,372 B2Granted
Control apparatus, control method, and engine control unit
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorYuji Yasui
Life of this patent
Estimating the term…
Abstract
A control apparatus, a control method, and an engine control unit are provided for controlling an output of a controlled object which has a relatively large response delay and/or dead time to rapidly and accurately converge to a target value. When the output of the controlled object is chosen to be that of an air/fuel ratio sensor in an internal combustion engine, the output of the air/fuel ratio sensor can be controlled to rapidly and accurately converge to a target value even in an extremely light load operation mode.
Claims159
A control apparatus comprising:
- deviation calculating means for calculating a deviation of an output of a controlled object from a predetermined target value;
- and
- control input calculating means for calculating a control input to said controlled object based on one modulation algorithm selected from a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm for converging the output of said controlled object to said target value in accordance with the calculated deviation;
- wherein said control input calculating means calculates a first intermediate value in accordance with said deviation based on said one modulation algorithm, and calculates said control input based on a product of said calculated first intermediate value and a predetermined gain.
1 more element
A control apparatus comprising:
- deviation calculating means for calculating a deviation of an output of a controlled object from a predetermined target value;
- first control input calculating means for calculating a control input to said controlled object based on one modulation algorithm selected from a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm for converging the output of said controlled object to said target value in accordance with the calculated deviation;
- second control input calculating means for calculating a control input to said controlled object in accordance with the calculated deviation based on a response specifying control algorithm for converging the output of said controlled object to said target value;
- controlled object state detecting means for detecting a state of said controlled object;
- and
- control input selecting means for selecting one of the control input calculated by said first control input calculating means and he control input calculated by said second control input calculating means in accordance with the detected state of said controlled object as a control input which should be inputted to said controlled object.
3 more elements
A control apparatus comprising:
- a downstream air/fuel ratio sensor for outputting a detection signal indicative of an air/fuel ratio of exhaust gases at a location downstream of a catalyzer in an exhaust pipe of an internal combustion engine;
- output deviation calculating means for calculating an output deviation of an output of said downstream air/fuel ratio sensor from a predetermined target value;
- and
- air/fuel ratio control means for controlling an air/fuel ratio of an air/fuel mixture supplied to said internal combustion engine in accordance with the calculated output deviation based on one modulation algorithm selected from a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm such that the output of said downstream air/fuel ratio sensor converges to said target value.
1 more element
A control apparatus comprising:
- a downstream air/fuel ratio sensor for outputting a detection signal indicative of an air/fuel ratio of exhaust gases at a location downstream of a catalyzer in an exhaust pipe of an internal combustion engine;
- output deviation calculating means for calculating an output deviation of an output of said downstream air/fuel ratio sensor from a predetermined target value;
- first air/fuel ratio control means for controlling an air/fuel ratio of an air/fuel mixture supplied to said internal combustion engine in accordance with the calculated output deviation based on one modulation algorithm selected from a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm such that the output of said downstream air/fuel ratio sensor converges to said target value;
- second air/fuel ratio control means for controlling the air/fuel ratio of the air/fuel mixture supplied to said internal combustion engine in accordance with the calculated output deviation based on a response specifying control algorithm such that the output of said downstream air/fuel ratio sensor converges to said target value;
- operating condition parameter detecting means for detecting an operating condition parameter indicative of an operating condition of said internal combustion engine;
- and
- selecting means for selecting one of said first air/fuel ratio control means and said second air/fuel ratio control means in accordance with the detected operating condition parameter to control the air/fuel ratio of the air/fuel mixture.
4 more elements
A control method comprising the steps of:
- calculating a deviation of an output of a controlled object from a predetermined target value;
- and
- calculating a control input to said controlled object based on one modulation algorithm selected from a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm for converging the output of said controlled object to said target value in accordance with the calculated deviation;
- wherein said step of calculating a control input includes calculating a first intermediate value in accordance with said deviation based on said one modulation algorithm, and calculating said control input based on a product of said calculated first intermediate value and a predetermined gain.
1 more element
A control method comprising the steps of:
- calculating a deviation of an output of a controlled object from a predetermined target value;
- calculating a control input to said controlled object based on one modulation algorithm selected from a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm for converging the output of said controlled object to said target value in accordance with the calculated deviation;
- calculating a control input to said controlled object in accordance with the calculated deviation based on a response specifying control algorithm for converging the output of said controlled object to said target value;
- detecting a state of said controlled object;
- and
- selecting one of the control input calculated based on the one modulation algorithm and the control input calculated based on the response specifying control algorithm in accordance with the detected state of said controlled object as a control input which should be inputted to said controlled object.
3 more elements
A control method comprising the steps of:
- outputting a detection signal indicative of an air/fuel ratio of exhaust gases at a location downstream of a catalyzer in an exhaust pipe of an internal combustion engine;
- calculating an output deviation of an output of said downstream air/fuel ratio sensor from a predetermined target value;
- and
- controlling an air/fuel ratio of an air/fuel mixture supplied to said internal combustion engine in accordance with the calculated output deviation based on one modulation algorithm selected from a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm such that the output of said downstream air/fuel ratio sensor converges to said target value.
1 more element
A control method comprising the steps of:
- outputting a detection signal indicative of an air/fuel ratio of exhaust gases at a location downstream of a catalyzer in an exhaust pipe of an internal combustion engine;
- calculating an output deviation of an output of said downstream air/fuel ratio sensor from a predetermined target value;
- controlling an air/fuel ratio of an air/fuel mixture supplied to said internal combustion engine in accordance with the calculated output deviation based on one modulation algorithm selected from a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm such that the output of said downstream air/fuel ratio sensor converges to said target value;
- controlling the air/fuel ratio of the air/fuel mixture supplied to said internal combustion engine in accordance with the calculated output deviation based on a response specifying control algorithm such that the output of said downstream air/fuel ratio sensor converges to said target value;
- detecting an operating condition parameter indicative of an operating condition of said internal combustion engine;
- and
- selecting one of the air/fuel ratio controlled based on the one modulation algorithm and the air/fuel ratio controlled based on the response specifying control algorithm in accordance with the detected operating condition parameter to control the air/fuel ratio of the air/fuel mixture.
4 more elements
An engine control unit including
- a control program for causing a computer to calculate a deviation of an output of a controlled object from a predetermined target value;
- and
- calculate a control input to said controlled object based on one modulation algorithm selected from a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm for converging the output of said controlled object to said target value in accordance with the calculated deviation
- wherein said control program further causes the computer to calculate a first intermediate value in accordance with said deviation based on said one modulation algorithm, and calculate said control input based on a product of said calculated first intermediate value and a predetermined gain.
1 more element
An engine control unit including a control program for causing a computer to calculate a deviation of an output of a controlled object from a predetermined target value;
- calculate a control input to said controlled object based on one modulation algorithm selected from a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm for converging the output of said controlled object to said target value in accordance with the calculated deviation;
- calculate a control input to said controlled object in accordance with the calculated deviation based on a response specifying control algorithm for converging the output of said controlled object to said target value;
- detect a state of said controlled object;
- and select one of the control input calculated based on the one modulation algorithm and the control input calculated based on the response specifying control algorithm in accordance with the detected state of said controlled object as a control input which should be inputted to said controlled object.
1 more element
An engine control unit including a control program for causing a computer to output a detection signal indicative of an air/fuel ratio of exhaust gases at a location downstream of a catalyzer in an exhaust pipe of an internal combustion engine;
- calculate an output deviation of an output of said downstream air/fuel ratio sensor from a predetermined target value;
- and control an air/fuel ratio of an air/fuel mixture supplied to said internal combustion engine in accordance with the calculated output deviation based on one modulation algorithm selected from a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm such that the output of said downstream air/fuel ratio sensor converges to said target value.
An engine control unit including a control program for causing a computer to output a detection signal indicative of an air/fuel ratio of exhaust gases at a location downstream of a catalyzer in an exhaust pipe of an internal combustion engine;
- calculate an output deviation of an output of said downstream air/fuel ratio sensor from a predetermined target value;
- control an air/fuel ratio of an air/fuel mixture supplied to said internal combustion engine in accordance with the calculated output deviation based on one modulation algorithm selected from a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm such that the output of said downstream air/fuel ratio sensor converges to said target value;
- control the air/fuel ratio of the air/fuel mixture supplied to said internal combustion engine in accordance with the calculated output deviation based on a response specifying control algorithm such that the output of said downstream air/fuel ratio sensor converges to said target value;
- detect an operating condition parameter indicative of an operating condition of said internal combustion engine;
- and select one of the air/fuel ratio controlled based on the one modulation algorithm and the air/fuel ratio controlled based on the response specifying control algorithm in accordance with the detected operating condition parameter to control the air/fuel ratio of the air/fuel mixture.
2 more elements
Dependencies are inferred from the claim text.