Apparatus with dynamic prediction of EGR in the intake manifold

An engine-controller combination, comprising:

• an engine;
• means for re-circulating exhaust gas;
• 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 future values of MAP and P.sub.o at an event k+R, where R is at least 1, where MAP represents an absolute pressure of an engine intake manifold and where P.sub.o represents a new air partial pressure of the engine intake manifold, and (iii) means for controlling the vehicle engine in response to the predicted future values of MAP and P.sub.o, providing improved control of an engine parameter comprising:
• air-fuel ratio, engine idle speed, engine speed, spark timing, wherein
• the microprocessor control unit iteratively:
• determines an estimation of MAP in response to a present measure of MAP, a prediction of MAP at event k, and a set of fixed predetermined correction coefficients;
• determines the prediction of MAP 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 MAP and (iii) a first set of fixed predetermined model parameters;
• determines the predicted value of MAP 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 MAP and (iii) the first set of fixed predetermined model parameters, wherein the predicted value of MAP at event k+R is a substantially accurate representation of a value of manifold absolute pressure at event k+R;
• determines a prediction of P.sub.o 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) previous predictions of P.sub.o and (iii) a second set of fixed predetermined model parameters;
• and
• determines the predicted value of P.sub.o 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 previous predictions of P.sub.o and (iii) the second set of fixed predetermined model parameters, wherein the predicted value of P.sub.o at event k+R is a substantially accurate representation of a value of new air partial pressure at event k+R.

An engine-controller combination, comprising:

• an engine;
• means for re-circulating exhaust gas;
• 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 future values of MAP and P.sub.o at an event k+R, where R is at least 1, where MAP represents an absolute pressure of an engine intake manifold and where P.sub.o represents a new air partial pressure of the engine intake manifold, and (iii) means for controlling the vehicle engine in response to the predicted future values of MAP and P.sub.o, providing improved control of an engine parameter comprising:
• air-fuel ratio, engine idle speed, engine speed, spark timing, wherein
• the 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 differece between a measure MAP at event k and a prediction of MAP 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 MAP in response to the prediction of MAP, the error signal, and the set of fixed predetermined correction coefficients;
• schedules first and second sets of fixed model parameters in response to the two measurement signals representing independent engine parameters;
• determines the prediction of MAP in response to the measurement signals for event k and preceding events, the set of estimated values, and the first set of fixed predetermined model parameters, the prediction of MAP including a prediction of MAP at engine event k+1;
• determines a prediction of P.sub.o in response to the measurement signals for event k and preceding events, previous predictions of P.sub.o, and the second set of fixed predetermined model parameters, the prediction of P.sub.o including a prediction of P.sub.o at engine event k+1;
• and
• determines engine control in response to the predictions of MAP and P.sub.o.

An engine-controller combination, comprising:

• a vehicle engine;
• an exhaust gas re-circulation valve providing re-circulation of engine exhaust gas;
• 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 future values of MAP and P.sub.o, where MAP represents an absolute pressure of an engine intake manifold and where P.sub.o represents a new air partial pressure of the engine intake manifold;
• and (iii) means for controlling the vehicle engine in response to the predicted future values of MAP and P.sub.o.