System and method for adjusting target actuator values of an engine using model predictive control to satisfy emissions and drivability targets and maximize fuel efficiency
A system includes a target generating module, a model predictive control (MPC) module, and an actuator module. The target generating module generates a target value for an actuator of an engine. The MPC module generates a set of possible adjustments to the target value and predicts an operating parameter for the set of possible adjustments. The predicted operating parameter includes an emission level and/or an operating parameter of an exhaust system. The MPC module determines a cost for the set of possible adjustments and selects the set of possible adjustments from multiple sets of possible adjustments based on the cost. The MPC module determines whether the predicted operating parameter for the selected set satisfies a constraint and adjusts the target value using the possible adjustments of the selected set when the predicted operating parameter satisfies the constraint. The actuator module controls the actuator based on the target value as adjusted.
1. A system comprising:
a target generating module that generates a target value for an actuator of an engine;
a model predictive control (MPC) module that:
generates a set of possible adjustments to the target value;
predicts an operating parameter for the set of possible adjustments to target value, wherein the predicted operating parameter includes at least one of an emission level and an operating parameter of an exhaust system;
determines a cost for the set of possible adjustments to the target value, wherein the cost is a value that represents a loss of engine performance;
selects the set of possible adjustments to the target value from multiple sets of possible adjustments to the target value based on the cost;
determines whether the predicted operating parameter for the selected set satisfies a constraint; and
adjusts the target value using the possible adjustments of the selected set when the predicted operating parameter satisfies the constraint; and
an actuator module that controls the actuator of the engine based on the target value as adjusted.
2. The system of claim 1 wherein the MPC module:
predicts a level of combustion noise for the set of possible adjustments to the target value; and
determines the cost for the set of possible adjustments to the target value based on the predicted combustion noise level.
3. The system of claim 1 wherein the predicted operating parameter includes a level of nitrogen oxide in exhaust gas produced by the engine.
4. The system of claim 1 wherein the predicted operating parameter includes a level of soot in exhaust gas produced by the engine.
5. The system of claim 1 wherein the predicted operating parameter includes an amount of soot buildup in a particulate filter of the exhaust system.
6. The system of claim 1 wherein the predicted operating parameter includes a level of ammonia stored in a selective catalytic reduction (SCR) catalyst of the exhaust system.
7. The system of claim 1 wherein the predicted operating parameter includes a temperature of a selective catalytic reduction (SCR) catalyst in the exhaust system.
8. The system of claim 1 wherein the predicted operating parameter includes a temperature of a particulate filter in the exhaust system.
9. The system of claim 1 wherein the predicted operating parameter further includes a speed of a vehicle that is propelled by the engine.
10. The system of claim 1 wherein the predicted operating parameter further includes a jerk of a vehicle that is propelled by the engine.
11. A method comprising:
generating a target value for an actuator of an engine;
generating a set of possible adjustments to the target value;
predicting an operating parameter for the set of possible adjustments to target value, wherein the predicted operating parameter includes at least one of an emission level and an operating parameter of an exhaust system;
determining a cost for the set of possible adjustments to the target value, wherein the cost is a value that represents a loss of engine performance;
selecting the set of possible adjustments to the target value from multiple sets of possible adjustments to the target value based on the cost;
determining whether the predicted operating parameter for the selected set satisfies a constraint;
adjusting the target value using the possible adjustments of the selected set when the predicted operating parameter satisfies the constraint; and
controlling the actuator of the engine based on the target value as adjusted.
12. The method of claim 11 further comprising:
predicting a level of combustion noise for the set of possible adjustments to the target value; and
determining the cost for the set of possible adjustments to the target value based on the predicted combustion noise level.
13. The method of claim 11 wherein the predicted operating parameter includes a level of nitrogen oxide in exhaust gas produced by the engine.
14. The method of claim 11 wherein the predicted operating parameter includes a level of soot in exhaust gas produced by the engine.
15. The method of claim 11 wherein the predicted operating parameter includes an amount of soot buildup in a particulate filter of the exhaust system.
16. The method of claim 11 wherein the predicted operating parameter includes a level of ammonia stored in a selective catalytic reduction (SCR) catalyst of the exhaust system.
17. The method of claim 11 wherein the predicted operating parameter includes a temperature of a selective catalytic reduction (SCR) catalyst in the exhaust system.
18. The method of claim 11 wherein the predicted operating parameter includes a temperature of a particulate filter in the exhaust system.
19. The method of claim 11 wherein the predicted operating parameter further includes a speed of a vehicle that is propelled by the engine.
20. The method of claim 11 wherein the predicted operating parameter further includes a jerk of a vehicle that is propelled by the engine.