Coordinated engine torque control
View Patent ↗A torque control system for regulating operation of an engine includes a throttle that regulates air flow into the engine and a device that regulates a torque output of the engine. A first module determines a throttle area based on a desired manifold absolute pressure (MAP) and a desired manifold air flow (MAF) and a second module determines a device set-point based on a desired air per cylinder (APC) and an engine speed. A third module generates a throttle control signal to control the throttle based on the throttle area and generates a device control signal to control the device based on the device set-point.
1. A torque control system for regulating operation of an engine, comprising:
a throttle that regulates air flow into said engine;
a device that regulates a torque output of said engine;
a first module that determines a throttle area based on a desired manifold absolute pressure (MAP) and a desired manifold air flow (MAF); and
a second module that determines a device set-point based on a desired air per cylinder (APC) and an engine speed; and
a third module that generates a throttle control signal to control said throttle based on said throttle area and that generates a device control signal to control said device based on said device set-point.
2. The torque control system of claim 1 wherein said device includes a cam phaser that regulates a phase angle of a cam shaft relative to a rotational position of said engine.
3. The torque control system of claim 2 wherein said cam shaft includes an intake cam shaft.
4. The torque control system of claim 2 wherein said cam shaft includes an exhaust cam shaft.
5. The torque control system of claim 1 wherein said device includes an exhaust gas recirculation (EGR) valve that regulates a flow of exhaust gas into an intake manifold of said engine.
6. The torque control system of claim 1 wherein said device includes an intake manifold valve that selectively partitions a volume of said intake manifold.
7. The torque control system of claim 1 wherein said device includes a turbo that provides compressed air to said engine.
8. The torque control system of claim 1 further comprising a fourth module that determines said desired MAP based on said engine speed and a torque request.
9. The torque control system of claim 1 further comprising a fourth module that determines said desired MAF based on said desired APC.
10. The torque control system of claim 1 further comprising a fourth module that determines said desired APC based on said torque request and a device schedule feedback signal.
11. The torque control system of claim 1 wherein said desired APC is corrected based on an APC correction factor.
12. The torque control system of claim 11 wherein said APC correction factor is determined based on a torque request and a torque estimate.
13. A method of regulating operation of an engine based on a coordinated torque control system, comprising:
determining a throttle area based on a desired manifold absolute pressure (MAP) and a desired manifold air flow (MAF);
determining a device set-point based on a desired air per cylinder (APC) and an engine speed;
generating a throttle control signal based on said throttle area;
generating a device control signal based on said device set-point;
regulating a throttle based on said throttle control signal to adjust air flow into said engine; and
regulating a device based on said device control signal to adjust a torque output of said engine.
14. The method of claim 13 wherein said device includes a cam phaser that regulates a phase angle of a cam shaft relative to a rotational position of said engine.
15. The method of claim 14 wherein said cam shaft includes an intake cam shaft.
16. The method of claim 14 wherein said cam shaft includes an exhaust cam shaft.
17. The method of claim 13 wherein said device includes an exhaust gas recirculation (EGR) valve that regulates a flow of exhaust gas into an intake manifold of said engine.
18. The method of claim 13 wherein said device includes an intake manifold valve that selectively partitions a volume of said intake manifold.
19. The method of claim 13 wherein said device includes a turbo that provides compressed air to said engine.
20. The method of claim 13 further comprising determining said desired MAP based on said engine speed and a torque request.
21. The method of claim 13 further comprising determining said desired MAF based on said desired APC.
22. The method of claim 13 further comprising determining said desired APC based on said torque request and a device schedule feedback signal.
23. The method of claim 13 wherein said desired APC is corrected based on an APC correction factor.
24. The method of claim 23 wherein said APC correction factor is determined based on a torque request and a torque estimate.
25. A torque control system for regulating operation of an engine, comprising:
a throttle that regulates air flow into said engine;
a device that regulates a torque output of said engine; and
a control module that determines a throttle area based on a desired manifold absolute pressure (MAP) and a desired manifold air flow (MAF), that determines a device set-point based on a desired air per cylinder (APC) and an engine speed, that generates a throttle control signal to control said throttle based on said throttle area and that generates a device control signal to control said device based on said device set-point.
26. The torque control system of claim 25 wherein said device includes a cam phaser that regulates a phase angle of a cam shaft relative to a rotational position of said engine.
27. The torque control system of claim 26 wherein said cam shaft includes an intake cam shaft.
28. The torque control system of claim 26 wherein said cam shaft includes an exhaust cam shaft.
29. The torque control system of claim 25 wherein said device includes an exhaust gas recirculation (EGR) valve that regulates a flow of exhaust gas into an intake manifold of said engine.
30. The torque control system of claim 25 wherein said device includes an intake manifold valve that selectively partitions a volume of said intake manifold.
31. The torque control system of claim 25 wherein said device includes a turbo that provides compressed air to said engine.
32. The torque control system of claim 25 wherein said control module determines said desired MAP based on said engine speed and a torque request.
33. The torque control system of claim 25 wherein said control module determines said desired MAF based on said desired APC.
34. The torque control system of claim 25 wherein said control module determines said desired APC based on said torque request and a device schedule feedback signal.
35. The torque control system of claim 25 wherein said desired APC is corrected based on an APC correction factor.
36. The torque control system of claim 35 wherein said APC correction factor is determined based on a torque request and a torque estimate.
37. A method of regulating operation of an engine based on a coordinated torque control system, comprising:
determining a throttle area based on a desired manifold absolute pressure (MAP) and a desired manifold air flow (MAF);
determining a cam phaser set-point based on a desired air per cylinder (APC) and an engine speed;
determining a device set-point based on a desired air per cylinder (APC) and an engine speed;
generating a throttle control signal based on said throttle area;
generating a cam phaser control signal based on said cam phaser set-point;
generating a device control signal based on said device set-point;
regulating a throttle based on said throttle control signal to adjust air flow into said engine
regulating a cam phaser based on said cam phaser control signal to adjust a torque output of said engine; and
regulating a device based on said device control signal to adjust a torque output of said engine.
38. The method of claim 37 wherein said cam phaser regulates a phase angle of a cam shaft relative to a rotational position of said engine.
39. The method of claim 38 wherein said cam shaft includes an intake cam shaft.
40. The method of claim 38 wherein said cam shaft includes an exhaust cam shaft.
41. The method of claim 37 wherein said device includes an exhaust gas recirculation (EGR) valve that regulates a flow of exhaust gas into an intake manifold of said engine.
42. The method of claim 37 wherein said device includes an intake manifold valve that selectively partitions a volume of said intake manifold.
43. The method of claim 37 wherein said device includes a turbo that provides compressed air to said engine.
44. The method of claim 37 further comprising determining said desired MAP based on said engine speed and a torque request.
45. The method of claim 37 further comprising determining said desired MAF based on said desired APC.
46. The method of claim 37 further comprising determining said desired APC based on said torque request and a device schedule feedback signal.
47. The method of claim 37 wherein said desired APC is corrected based on an APC correction factor.
48. The method of claim 47 wherein said APC correction factor is determined based on a torque request and a torque estimate.