Method for predicting R-step ahead engine state measurements
First Claim
Patent Images
1. An engine--powertrain--controller combination, comprising:
- a powertrain receiving power from said engine and including a transmission;
means for determining measures of a set of engine parameters and for providing measurement signals indicative of said measures; and
a microprocessor control unit, including (i) means for receiving the measurement signals, (ii) means for predicting a prediction set including at least one predicted value of a desired engine state, and (iii) means for controlling the vehicle engine--powertrain in response to the prediction set, providing improved control of an engine--powertrain parameter comprising;
air-fuel ratio, engine idle speed, engine speed, spark timing, or transmission gear selection, whereinthe microprocessor control unit iteratively (i) determines the prediction set in response to (a) the measurement signals, (b) a linear model comprising a set of fixed predetermined model parameters, and (c) an estimation set including at least one estimated value of the desired engine state, and (ii) determines the estimation set in response to (a) a present measure of the desired engine state, (b) the prediction set, and (c) a correction set of fixed predetermined correction coefficients wherein the predicted value of the desired engine state is a substantially accurate prediction of the desired engine state'"'"'s future value.
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Abstract
An engine--powertrain--controller combination includes a microprocessor control unit which predicts a future value of an engine state and uses that predicted value in engine control functions for improved control of the engine--powertrain in such areas as air-fuel ratio control, control of the engine during engine idle, and engine spark timing control.
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Citations
38 Claims
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1. An engine--powertrain--controller combination, comprising:
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a powertrain receiving power from said engine and including a transmission; means for determining measures of a set of engine parameters and for providing measurement signals indicative of said measures; and a microprocessor control unit, including (i) means for receiving the measurement signals, (ii) means for predicting a prediction set including at least one predicted value of a desired engine state, and (iii) means for controlling the vehicle engine--powertrain in response to the prediction set, providing improved control of an engine--powertrain parameter comprising;
air-fuel ratio, engine idle speed, engine speed, spark timing, or transmission gear selection, whereinthe microprocessor control unit iteratively (i) determines the prediction set in response to (a) the measurement signals, (b) a linear model comprising a set of fixed predetermined model parameters, and (c) an estimation set including at least one estimated value of the desired engine state, and (ii) determines the estimation set in response to (a) a present measure of the desired engine state, (b) the prediction set, and (c) a correction set of fixed predetermined correction coefficients wherein the predicted value of the desired engine state is a substantially accurate prediction of the desired engine state'"'"'s future value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An engine--powertrain--controller combination, comprising:
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an engine; a powertrain receiving power from said engine and including a transmission; means for determining, at successive time events, measures of a set of engine parameters and for providing measurement signals indicative of said measures; and a microprocessor control unit, including (i) means for receiving the measurement signals, (ii) means for predicting from engine information available at event k, a prediction set including at least one predicted value of a desired engine state at an event k+R, where R is at least 1, and (iii) means for controlling the vehicle engine--powertrain in response to the prediction set, providing improved control of an engine--powertrain parameter comprising;
air-fuel ratio, engine idle speed, engine speed, spark timing, or transmission gear selection, whereinthe microprocessor control unit iteratively; determines an estimation of the desired engine state in response to a present measure of the desired engine state, a prediction of the desired engine state at event k, and a set of fixed predetermined correction coefficients; determines the prediction of the desired engine state at an event k+1 in response to information including (i) the measurement signals including signals indicative of the measures of the set of engine parameters at event k and previous events, (ii) the estimation of the desired engine state, and (iii) a set of fixed predetermined model parameters; and determines the predicted value of the desired engine state at event k+R in response to information including (i) the measurement signals including signals indicative of the measures of the set of engine parameters at event k and previous events, (ii) the estimation of the desired engine state, and (iii) the set of fixed predetermined model parameters, wherein the predicted value of the desired engine state at event k+R is a substantially accurate representation of a value of the desired engine state at event k+R. - View Dependent Claims (31, 32, 33)
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34. An engine--powertrain--controller combination, comprising:
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an engine; a powertrain receiving power from said engine and including a transmission; means for determining, at successive time events, measures of a set of engine parameters and for providing measurement signals indicative of said measures; and a microprocessor control unit, including (i) means for receiving the measurement signals, (ii) means for predicting, from engine information available at event k, a prediction set including at least one predicted value of a desired engine state at an event k+R, where R is greater than zero, and (iii) means for controlling the vehicle engine--powertrain in response to the prediction set, providing improved control of an engine--powertrain parameter comprising;
air-fuel ratio, engine idle speed, engine speed, spark timing, or transmission gear selection, whereinthe microprocessor control unit; initializes a set of variables including the set of engine parameters for events preceding time k;
thereafter iteratively;receives the measurement signals for event k; determines an error signal in response to a difference between a measure of the desired engine state at event k and a prediction of the desired engine state for event k; schedules a set of fixed predetermined correction coefficients in response to two of the measurement signals representing independent engine parameters; determines a set of estimated values of the desired engine state in response to the prediction set, the error signal, and the set of fixed predetermined correction coefficients; schedules a set of fixed model parameters in response to the two measurement signals representing independent engine states; determines the prediction set in response to the measurement signals for event k and preceding events, the set of estimated values, and a set of fixed predetermined model parameters, the prediction set including a prediction of the desired engine state at event k+1; and determines engine--powertrain control in response to the prediction set. - View Dependent Claims (35, 36, 37, 38)
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Specification