Granted Patent B2

US 8,112,215 · App. 12/187,564 · Granted Feb 7, 2012

Abstract

Claims (29)

1. A method for operating cruise control in a vehicle having an engine with active fuel management (AFM), the method comprising:

determining adaptive scaler values based on a cylinder deactivation signal and calibrated scaler values;

calculating cruise control commands based on the adaptive scaler values; and

controlling a speed of the vehicle based on the cruise control commands.

2. The method of claim 1 wherein calculating the cruise control commands comprises calculating a first cruise control command for the engine operating when AFM is enabled and calculating a second cruise control command for the engine operating when AFM is disabled.

3. The method of claim 2 further comprising, determining a vehicle speed error.

4. The method of claim 3 wherein the vehicle speed error is based on a measured vehicle speed and a desired set vehicle speed.

5. The method of claim 4 further comprising, determining the calibrated scaler values based on the vehicle speed error.

6. The method of claim 5 wherein the first cruise control command is based on a product of the calibrated scaler values and each of a proportional, integral and derivative term associated with the first cruise control command.

7. The method of claim 2 , further comprising:

determining whether the engine is transitioning out of AFM; and

transitioning to the second cruise control command wherein the adaptive scaler values are one.

8. The method of claim 7 wherein the transitioning comprises ramping the adaptive scaler values from the calibrated scaler values to one.

9. The method of claim 2 , further comprising:

determining whether the engine is transitioning into AFM; and

transitioning to the first cruise control command wherein the calibrated scaler values are between zero and one.

10. The method of claim 9 wherein the transitioning comprises ramping the adaptive scaler values from one to the calibrated scaler values.

11. A controller for operating cruise control in a vehicle having an engine with active fuel management (AFM), the controller comprising:

a scaler value determination module that determines adaptive scaler values based on a cylinder deactivation signal and calibrated scaler values;

a cruise command module that calculates cruise control commands based on the adaptive scaler values; and

a cruise control module that controls a speed of the vehicle based on the cruise control commands.

12. The controller of claim 11 wherein the cruise command module calculates a first cruise control command for the engine operating when AFM is enabled and calculates a second cruise control command for the engine operating when AFM is disabled.

13. The controller of claim 12 further comprising, a calibration memory module that determines the calibrated scaler values based on a vehicle speed error.

14. The controller of claim 13 wherein the vehicle speed error is based on a measured vehicle speed and a desired set vehicle speed.

15. The controller of claim 14 wherein the first cruise control command is based on a product of the calibrated scaler values and each of a proportional, integral and derivative term associated with the first cruise control command.

16. The controller of claim 12 wherein the cruise command module determines whether the engine is transitioning out of AFM and transitions to the second cruise control command wherein the adaptive scaler values are one based on the determination.

17. The controller of claim 16 wherein the cruise command module ramps the adaptive scaler values from the calibrated scaler values to one.

18. The controller of claim 12 wherein the cruise command module determines whether the engine is transitioning into AFM and transitions to the first cruise control command wherein the calibrated scaler values are between zero and one based on the determination.

19. The controller of claim 18 wherein the adaptive scaler values are ramped from one to the calibrated scaler values.

Assignments (12)