Model predictive control systems and methods for future torque changes

• US 9,388,758 B2
• Filed: 03/26/2014
• Issued: 07/12/2016
• 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: Pochner, Klaus, Whitney, Christopher E., Cygan, Gary Robert Jr.
• Primary Examiner(s): Huynh, Hai
• Assistant Examiner(s): NAJMUDDIN, RAZA NEHAL
• Application Number:
  US14/226,006
• Publication Number:
  US 20150275796A1
• Time in Patent Office: 839 Days
• Field of Search: 701/101, 701/102, 701/103, 701/104, 701/105, 701/106, 701/110, 701/111, 701/113, 701/114, 701/115
• US Class Current: 1/1
• CPC Class Codes: F02D 2041/001 for engines with variable valve actuation
• 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 2200/025 Engine noise, e.g. determined by using an acoustic sensor
• CPC Class Codes: F02D 2200/0611 Fuel type, fuel composition or fuel quality
• CPC Class Codes: F02D 2200/1004 Estimation of the output torque
• CPC Class Codes: F02D 2200/602 Pedal position
• CPC Class Codes: F02D 2200/606 Driving style, e.g. sporty or economic driving
• 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 41/0007 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 41/04 Introducing corrections for particular operating conditions F02D41/14 takes precedence
• CPC Class Codes: F02D 41/1401 characterised by the control or regulation method F02D41/1473, F02D41/1477 take precedence
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine
• CPC Class Codes: F02N 2300/2006 using prediction of future conditions
• CPC Class Codes: F02P 5/1502 using one central computing unit

Abstract

A prediction module, based on a set of possible target values for M future times and a model of an engine, determines predicted torques of the engine for the M future times, respectively. M is an integer greater than one. A cost module determines a cost for the set of possible target values based on comparisons of the predicted torques for the M future times with engine torque requests for the M future times, respectively. A selection module, based on the cost, selects the set of possible target values from a group including the set of possible target values and N other sets of possible target values, wherein N is an integer greater than zero, and sets target values based on the selected set of possible target values. An actuator module controls an engine actuator based on a first one of the target values.

Claims

1. An engine control system of a vehicle, comprising:

a prediction module that, based on a set of possible target values for M future times and a model of an engine, determines predicted torques of the engine for the M future times, respectively,

wherein M is an integer greater than one;

a cost module that determines a cost for the set of possible target values based on comparisons of the predicted torques for the M future times with engine torque requests for the M future times, respectively;

a selection module that, based on the cost, selects the set of possible target values from a group including the set of possible target values and N other sets of possible target values, wherein N is an integer greater than zero, and that sets target values based on the selected set of possible target values; and

an actuator module that controls an engine actuator based on a first one of the target values.

2. The engine control system of claim 1 wherein:

based on the set of possible target and the model of the engine, the prediction module further determines a predicted fuel efficiency of the engine; and

the cost module determines the cost for the set of possible target values further based on a comparison of the predicted fuel efficiency with a predetermined maximum fuel efficiency.

3. The engine control system of claim 1 wherein:

based on the set of possible target and the model of the engine, the prediction module further determines a predicted noise, vibration, and harshness (NVH) value; and

the cost module determines the cost for the set of possible target values further based on a comparison of the predicted NVH value with a predetermined NVH value.

4. The engine control system of claim 1 further comprising a future request module that sets at least one of the engine torque requests for the M future times based on a gear shift of a transmission.

5. The engine control system of claim 1 further comprising a future request module that sets at least one of the engine torque requests for the M future times based on a change in an accelerator pedal position.

6. The engine control system of claim 1 further comprising a future request module that sets at least one of the engine torque requests for the M future times based on a change in a load on the engine.

7. The engine control system of claim 1 further comprising a future request module that sets at least one of the engine torque requests for the M future times based on a change in torque of an electric motor.

8. The engine control system of claim 1 further comprising a future request module that sets at least one of the engine torque requests for the M future times when a sport mode of operation is selected for the vehicle.

9. The engine control system of claim 1 wherein the selection module selects the set of possible target values from the group based on the cost being less than costs of the N other sets of possible target values, respectively.

10. The engine control system of claim 1 further comprising:

a boost actuator module that controls opening of a wastegate of a turbocharger based on a second one of the target values;

an exhaust gas recirculation (EGR) actuator module that controls opening of an EGR valve based on a third one of the target values;

a phaser actuator module that controls intake and exhaust valve phasing based on fourth and fifth ones of the target values, respectively;

a spark actuator module that controls spark timing based on a sixth one of the target values; and

a fuel actuator module that controls fueling based on a seventh one of the target values,

wherein the actuator module controls the opening of a throttle valve based on the one of the target values.

11. An engine control method for a vehicle, comprising:

based on a set of possible target values for M future times and a model of an engine, determining predicted torques of the engine for the M future times, respectively,

wherein M is an integer greater than one;

determining a cost for the set of possible target values based on comparisons of the predicted torques for the M future times with engine torque requests for the M future times, respectively;

based on the cost, selecting the set of possible target values from a group including the set of possible target values and N other sets of possible target values, wherein N is an integer greater than zero;

setting target values based on the selected set of possible target values; and

controlling an engine actuator based on a first one of the target values.

12. The engine control method of claim 11 further comprising:

based on the set of possible target and the model of the engine, determining a predicted fuel efficiency of the engine; and

determining the cost for the set of possible target values further based on a comparison of the predicted fuel efficiency with a predetermined maximum fuel efficiency.

13. The engine control method of claim 11 further comprising:

based on the set of possible target and the model of the engine, determining a predicted noise, vibration, and harshness (NVH) value; and

determining the cost for the set of possible target values further based on a comparison of the predicted NVH value with a predetermined NVH value.

14. The engine control method of claim 11 further comprising setting at least one of the engine torque requests for the M future times based on a gear shift of a transmission.

15. The engine control method of claim 11 further comprising setting at least one of the engine torque requests for the M future times based on a change in an accelerator pedal position.

16. The engine control method of claim 11 further comprising setting at least one of the engine torque requests for the M future times based on a change in a load on the engine.

17. The engine control method of claim 11 further comprising setting at least one of the engine torque requests for the M future times based on a change in torque of an electric motor.

18. The engine control method of claim 11 further comprising setting at least one of the engine torque requests for the M future times when a sport mode of operation is selected for the vehicle.

19. The engine control method of claim 11 further comprising selecting the set of possible target values from the group based on the cost being less than costs of the N other sets of possible target values, respectively.

20. The engine control method of claim 11 further comprising:

controlling opening of a wastegate of a turbocharger based on a second one of the target values;

controlling opening of an exhaust gas recirculation (EGR) valve based on a third one of the target values;

controlling intake and exhaust valve phasing based on fourth and fifth ones of the target values, respectively;

controlling spark timing based on a sixth one of the target values; and

controlling fueling based on a seventh one of the target values,

wherein the engine actuator is a throttle valve.