Airflow control systems and methods using model predictive control

Patent metadata

Field	Value
Publication number	US-9376965-B2
Application number	US-201313911121-A
Country	US
Kind code	B2
Filing date	Jun 6, 2013
Priority date	Apr 23, 2013
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A torque requesting module generates a first torque request for a spark ignition engine based on driver input. A torque conversion module converts the first torque request into a second torque request. A setpoint control module, based on the second torque request, generates a mass of air per cylinder (APC) setpoint, an exhaust gas recirculation (EGR) setpoint, an intake valve phasing setpoint, and an exhaust valve phasing setpoint. A model predictive control (MPC) module: identifies sets of possible target values based on the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints; generates predicted parameters based on a model of the spark ignition engine and the sets of possible target values, respectively; selects one of the sets of possible target values based on the predicted parameters; and sets target values based on the possible target values of the selected one of the sets.

First claim

What is claimed is:

1. An engine control system for a vehicle, comprising:
a torque requesting module that generates a first torque request for a spark ignition engine based on driver input;
a torque conversion module that converts the first torque request into a second torque request;
a setpoint control module that, based on the second torque request, generates a mass of air per cylinder (APC) setpoint, an exhaust gas recirculation (EGR) setpoint, an intake valve phasing setpoint, and an exhaust valve phasing setpoint;
a model predictive control (MPC) module that identifies sets of possible target values based on the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints, that generates predicted parameters based on a model of the spark ignition engine and the sets of possible target values, respectively, that selects one of the sets of possible target values based on the predicted parameters, and that sets target values based on the possible target values of the selected one of the sets; and
a throttle actuator module that controls opening of a throttle valve based on a first one of the target values.

2. The engine control system of claim 1 further comprising:
a boost actuator module that controls opening of a wastegate 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; and
a phaser actuator module that controls intake and exhaust valve phasing based on fourth and fifth ones of the target values.

3. The engine control system of claim 1 wherein the MPC module selects the one of the sets of possible target values further based on the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints.

4. The engine control system of claim 3 wherein the MPC module selects the one of the sets of possible target values based on comparisons of the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints with the predicted parameters, respectively.

5. The engine control system of claim 1 wherein the MPC module:
determines costs for the sets based on:
first comparisons of the APC setpoint with predicted APCs determined for the sets, respectively;
second comparisons of the EGR setpoint with predicted EGRs determined for the sets, respectively;
third comparisons of the intake valve phasing setpoint with predicted intake valve phasing values determined for the sets, respectively; and
fourth comparisons of the exhaust valve phasing setpoint with predicted exhaust phasing values determined for the sets, respectively; and

selects the one of the sets of possible target values based on the costs.

6. The engine control system of claim 5 wherein the MPC module applies first, second, third, and fourth weighting values to the first, second, third, and fourth comparisons, respectively, to determine the costs, and
wherein the first weighting value is one of greater than and less than all of the second, third, and fourth weighting values.

7. The engine control system of claim 1 wherein the MPC module sets the target values to within predetermined ranges for the target values, respectively.

8. The engine control system of claim 1 wherein the setpoint module generates the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints further based on desired combustion phasing.

9. The engine control system of claim 1 wherein the setpoint module generates the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints further based on predetermined ranges for the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints, respectively.

10. The engine control system of claim 1 wherein the setpoint module generates the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints further based on a number of deactivated cylinders.

11. An engine control method for a vehicle, comprising:
generating a first torque request for a spark ignition engine based on driver input;
converting the first torque request into a second torque request;
generating, based on the second torque request, a mass of air per cylinder (APC) setpoint, an exhaust gas recirculation (EGR) setpoint, an intake valve phasing setpoint, and an exhaust valve phasing setpoint;
using a model predictive control (MPC) module:
identifying sets of possible target values based on the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints;
generating predicted parameters based on a model of the spark ignition engine and the sets of possible target values, respectively;
selecting one of the sets of possible target values based on the predicted parameters; and
sets target values based on the possible target values of the selected one of the sets; and

controlling opening of a throttle valve based on a first one of the target values.

12. The engine control method of claim 11 further comprising:
controlling opening of a wastegate 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; and
controlling intake and exhaust valve phasing based on fourth and fifth ones of the target values.

13. The engine control method of claim 11 further comprising selecting the one of the sets of possible target values further based on the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints.

14. The engine control method of claim 13 further comprising selecting the one of the sets of possible target values based on comparisons of the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints with the predicted parameters, respectively.

15. The engine control method of claim 11 further comprising:
determining costs for the sets based on:
first comparisons of the APC setpoint with predicted APCs determined for the sets, respectively;
second comparisons of the EGR setpoint with predicted EGRs determined for the sets, respectively;
third comparisons of the intake valve phasing setpoint with predicted intake valve phasing values determined for the sets, respectively; and
fourth comparisons of the exhaust valve phasing setpoint with predicted exhaust phasing values determined for the sets, respectively; and

selecting the one of the sets of possible target values based on the costs.

16. The engine control method of claim 15 further comprising applying first, second, third, and fourth weighting values to the first, second, third, and fourth comparisons, respectively, to determine the costs, and
wherein the first weighting value is one of greater than and less than all of the second, third, and fourth weighting values.

17. The engine control method of claim 11 further comprising setting the target values to within predetermined ranges for the target values, respectively.

18. The engine control method of claim 11 further comprising generating the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints further based on desired combustion phasing.

19. The engine control method of claim 11 further comprising generating the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints further based on predetermined ranges for the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints, respectively.

20. The engine control method of claim 11 further comprising generating the APC, EGR, intake valve phasing, and exhaust valve phasing setpoints further based on a number of deactivated cylinders.

Assignees

• Gm Global Tech Operations Inc

Inventors

• Whitney Christopher E
• Storch Sharon L

Classifications

• F02D41/22

  Safety or indicating devices for abnormal conditions {(in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809)} · CPC title

• F02M25/0809

  Judging failure of purge control system · CPC title

• F01L2800/11

  Fault detection, diagnosis · CPC title

• F02D2041/001

  for engines with variable valve actuation · CPC title

• Y02T10/47

  Cross-Sectional Technologies · mapped topic