System and method for improving the response time of an engine using model predictive control

• US 9,334,815 B2
• Filed: 03/26/2014
• Issued: 05/10/2016
• Est. Priority Date: 03/26/2014
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Cygan, Gary Robert Jr., Verdejo, Julian R., Jin, Ning, Bemporad, Alberto, Bernardini, Daniele
• Primary Examiner(s): HUYNH, HAI H
• Application Number:
  US14/225,587
• Publication Number:
  US 20150275785A1
• Time in Patent Office: 776 Days
• Field of Search: 701/103, 701/110, 731/141.5, 123/399, 123/436
• US Class Current: 1/1
• CPC Class Codes: F01L 1/34409 by torque-responsive means
• CPC Class Codes: F01L 13/0015 for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
• CPC Class Codes: F01L 2800/14 Determining a position, e.g. phase or lift
• CPC Class Codes: F02B 37/12 Control of the pumps
• CPC Class Codes: F02D 11/105 characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
• CPC Class Codes: F02D 13/0238 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 2200/0411 Volumetric efficiency
• CPC Class Codes: F02D 2200/60 said parameters being related to the driver demands or status
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 28/00 Programme-control of engines
• 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 41/005 according to engine operating conditions
• CPC Class Codes: F02D 41/023 in relation with the gear ratio shifting conjoint control for improving gear change B60W30/19
• CPC Class Codes: F02D 41/10 for acceleration
• CPC Class Codes: G05B 13/048 using a predictor
• 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 predicted parameters based on a model of a subsystem and a set of possible target values. The MPC module generates a cost for the set of possible target values based on the predicted parameters and at least one of weighting values and references values. The MPC module adjusts the at least one of the weighting values and the reference values based on a desired rate of change in an operating condition of the subsystem. The MPC module selects the set of possible target values from multiple sets of possible target values based on the cost. The actuator module adjusts an actuator of the subsystem based on at least one of the target values.

Claims

1. A system comprising:

a model predictive control (MPC) module that;

generates predicted parameters based on a model of a subsystem and a set of possible target values;

generates a cost for the set of possible target values based on the predicted parameters and at least one of weighting values and references values;

adjusts the at least one of the weighting values and the reference values based on a desired rate of change in an operating condition of the subsystem; and

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

an actuator module that adjusts an actuator of the subsystem based on at least one of the target values.

2. The system of claim 1 wherein the MPC module adjusts at least one of the weighting values to zero when the desired change rate is greater than a first rate.

3. The system of claim 2 wherein:

the weighting values include a first weighting value associated with a difference between one of the possible target values and one of the reference values; and

the MPC module adjusts the first weighting value to zero when the desired change rate is greater than the first rate.

4. The system of claim 2 wherein:

the weighting values include a first weighting value associated with a total amount of change in one of the possible target values over N control loops;

the MPC module adjusts the first weighting value to zero when the desired change rate is greater than the first rate; and

N is an integer greater than one.

5. The system of claim 2 wherein the MPC module determines the first rate based on a rate of change in at least one of the predicted parameters.

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

determines a reference trajectory based on the desired change rate; and

adjusts at least one of the references values based on the reference trajectory.

7. The system of claim 1 wherein the MPC module adjusts at least one of the references values to one of at least one of a maximum limit of the actuator and a minimum limit of the actuator when the desired change rate is greater than a first rate.

8. The system of claim 1 wherein the subsystem is an engine and the operating condition is a desired torque output of the engine.

9. The system of claim 8 wherein:

the weighting values include a first weighting value associated with a difference between a target throttle opening area and a reference throttle opening area; and

the MPC module adjusts the first weighting value to zero when the desired change rate is greater than a first rate.

10. The system of claim 8 wherein:

the reference values include a reference throttle opening area;

the MPC module determines a reference trajectory based on the desired change rate; and

the MPC module adjusts the reference throttle opening area based on the reference trajectory.

11. A method comprising:

generating predicted parameters based on a model of a subsystem and a set of possible target values;

generating a cost for the set of possible target values based on the predicted parameters and at least one of weighting values and references values;

adjusts the at least one of the weighting values and the reference values based on a desired rate of change in an operating condition of the subsystem;

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

adjusting an actuator of the subsystem based on at least one of the target values.

12. The method of claim 11 further comprising adjusting at least one of the weighting values to zero when the desired change rate is greater than a first rate.

13. The method of claim 12 wherein the weighting values include a first weighting value associated with a difference between one of the possible target values and one of the reference values, the method further comprising adjusting the first weighting value to zero when the desired change rate is greater than the first rate.

14. The method of claim 12 wherein the weighting values include a first weighting value associated with a total amount of change in one of the possible target values over N control loops and N is an integer greater than one, the method further comprising adjusting the first weighting value to zero when the desired change rate is greater than the first rate.

15. The method of claim 12 further comprising determining the first rate based on a rate of change in at least one of the predicted parameters.

16. The method of claim 11 further comprising:

determining a reference trajectory based on the desired change rate; and

adjusting at least one of the references values based on the reference trajectory.

17. The method of claim 11 further comprising adjusting at least one of the references values to one of at least one of a maximum limit of the actuator and a minimum limit of the actuator when the desired change rate is greater than a first rate.

18. The method of claim 11 wherein the subsystem is an engine and the operating condition is a desired torque output of the engine.

19. The method of claim 18 wherein the weighting values include a first weighting value associated with a difference between a target throttle opening area and a reference throttle opening area, the method further comprising adjusting the first weighting value to zero when the desired change rate is greater than a first rate.

20. The method of claim 18 wherein the reference values include a reference throttle opening area, the method further comprising:

determining a reference trajectory based on the desired change rate; and

adjusting the reference throttle opening area based on the reference trajectory.