System and method for adjusting weighting values assigned to errors in target actuator values of an engine when controlling the engine using model predictive control

• US 9,863,345 B2
• Filed: 11/03/2015
• Issued: 01/09/2018
• Est. Priority Date: 11/27/2012
• Status: Expired due to Fees

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Wong, Kevin C., Long, Ruixing
• Primary Examiner(s): Huynh, Hai
• Assistant Examiner(s): Laguarda, Gonzalo
• Application Number:
  US14/931,134
• Publication Number:
  US 20170122235A1
• Time in Patent Office: 798 Days
• Field of Search: 701103, 701110, 123436
• CPC Class Codes: F01L 1/34 characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
• CPC Class Codes: F01L 1/344 changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
• CPC Class Codes: F02D 13/0219 by shifting the phase, i.e. the opening periods of the valves are constant
• CPC Class Codes: F02D 2041/001 for engines with variable valve actuation
• CPC Class Codes: F02D 2041/0017 by simultaneous control of throttle and exhaust gas recirculation
• CPC Class Codes: F02D 2041/1412 using a predictive controller
• CPC Class Codes: F02D 2041/1433 using a model or simulation of the system
• CPC Class Codes: F02D 2200/602 Pedal position
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 37/02 one of the functions being ignition
• CPC Class Codes: F02D 41/0002 Controlling intake air
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/0087 Selective cylinder activation, i.e. partial cylinder operation deceleration cut-off F02D41/123
• CPC Class Codes: F02D 41/1401 characterised by the control or regulation method F02D41/1473, F02D41/1477 take precedence
• CPC Class Codes: F02D 41/1406 with use of a optimisation method, e.g. iteration
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine
• CPC Class Codes: F02D 41/3005 Details not otherwise provided for
• CPC Class Codes: F02D 9/08 Throttle valves specially adapted therefor; Arrangements of such valves in conduits
• CPC Class Codes: F02M 26/05 High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 : Engine management systems

Abstract

A system according to the principles of the present disclosure includes a model predictive control (MPC) module and an actuator module. The MPC module generates a set of possible target values for an actuator of an engine and predicts an operating parameter of the engine for each of the possible target values. The MPC module determines a weighting value associated with each of the target values based on a corresponding iteration number and determines a cost for the set of possible target values based on the predicted operating parameters and the weighting values. The MPC module selects the set of possible target values from multiple sets of possible target values based on the cost and sets target values to the possible target values of the selected set. The actuator module controls an actuator of an engine based on at least one of the target values.

Claims

1. A system comprising:

a model predictive control (MPC) module that;

during a current iteration, generates a set of possible target values for an actuator of an engine for a current iteration and for multiple iterations in the future, the set of the possible target values including one target value for the current iteration and one target value for each of the future iterations;

predicts an operating parameter of the engine for each of the possible target values;

determines a weighting value associated with each of the target values based on a corresponding iteration number;

determines a cost for the set of possible target values based on the predicted operating parameters and the weighting values;

selects the set of possible target values from multiple sets of possible target values based on the cost; and

sets the target value for the actuator to the possible target value of the selected set corresponding to the current iteration; and

an actuator module that controls the actuator of the engine based on the target value for the actuator.

2. The system of claim 1 wherein the MPC module increases the weighting values for at least one of the target values as the iteration number increases.

3. The system of claim 1 wherein the MPC module decreases the weighting values for at least one of the target values as the iteration number increases.

4. The system of claim 1 wherein the MPC module:

assigns a first weighting value to one of the target values for a first iteration; and

assigns a second weighting value to the same one of the target values for a second iteration, wherein the second weighting value is different than the first weighting value.

5. The system of claim 1 wherein:

the MPC module adjusts the weighting values for a first one of the target values based on a first reference value associated with the first target value; and

each of the weighting values corresponds to one of current iteration and one of the future iterations.

6. The system of claim 5 wherein the MPC module adjusts the weighting values for the first target value based on a change in the first reference value at one of the future iterations.

7. The system of claim 6 wherein the MPC module:

increases the weighting values for those of the future iterations corresponding to a first period before the change in the first reference value; and

decreases the weighting values for those of the future iterations corresponding to a second period after the change in the first reference value.

8. The system of claim 6 wherein the MPC module adjusts the weighting values for the first target value based on a desired relationship between:

a first time when the first reference value changes; and

a second time when the first target value responds to the change in the first reference value.

9. The system of claim 8 wherein the MPC module adjusts the weighting values for the first target value such that the second time is earlier than the first time.

10. The system of claim 8 wherein the MPC module adjusts the weighting values for the first target value such that the second time is later than the first time.

11. A method comprising:

during a current iteration, generating a set of possible target values for an actuator of an engine for a current iteration and for multiple iterations in the future, the set of the possible target values including one target value for the current iteration and one target value for each of the future iterations;

predicting an operating parameter of the engine for each of the possible target values;

determining a weighting value associated with each of the target values based on a corresponding iteration number;

determining a cost for the set of possible target values based on the predicted operating parameters and the weighting values;

selecting the set of possible target values from multiple sets of possible target values based on the cost;

setting the target value for the actuator to the possible target value of the selected set corresponding to the current iteration; and

controlling the actuator of the engine based on the target value for the actuator.

12. The method of claim 11 further comprising increasing the weighting values for at least one of the target values as the iteration number increases.

13. The method of claim 11 further comprising decreasing the weighting values for at least one of the target values as the iteration number increases.

14. The method of claim 11 further comprising:

assigning a first weighting value to one of the target values for a first iteration; and

assigning a second weighting value to the same one of the target values for a second iteration, wherein the second weighting value is different than the first weighting value.

15. The method of claim 11 further comprising adjusting the weighting values for a first one of the target values based on a first reference value associated with the first target value, wherein each of the weighting values corresponds to one of the future iterations.

16. The method of claim 15 further comprising adjusting the weighting values for the first target value based on a change in the first reference value at one of the future iterations.

17. The method of claim 16 further comprising:

increasing the weighting values for those of the future iterations corresponding to a first period before the change in the first reference value; and

decreasing the weighting values for those of the future iterations corresponding to a second period after the change in the first reference value.

18. The method of claim 16 further comprising adjusting the weighting values for the first target value based on a desired relationship between:

a first time when the first reference value changes; and

a second time when the first target value responds to the change in the first reference value.

19. The method of claim 18 further comprising adjusting the weighting values for the first target value such that the second time is earlier than the first time.

20. The method of claim 18 further comprising adjusting the weighting values for the first target value such that the second time is later than the first time.