CHASSIS SYSTEM ENGINE TORQUE REQUESTS

• US 20090228178A1
• Filed: 01/22/2009
• Published: 09/10/2009
• Est. Priority Date: 03/07/2008
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Hutchinson, Mark T., Bauerle, Paul A., Stempnik, Joseph M., Jess, Richard B., Kociba, Michael L., Costin, Mark H., Pitsch, Michael J.
• Granted Patent: US 8,170,759 B2
• Time in Patent Office: Days
• US Class Current: 701/54
• 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 2200/501 Vehicle speed
• CPC Class Codes: F02D 2200/602 Pedal position
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 2250/26 by applying a torque limit
• CPC Class Codes: F02D 41/0225 in relation with the gear ratio or shift lever position
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine

Abstract

An engine control system of a vehicle comprises a torque module and a chassis request evaluation module. The torque module controls a torque output of an engine based on a driver torque request and selectively increases the torque output based on a chassis torque request. The chassis request evaluation module selectively prevents the increase of the torque output based on at least one of a vehicle speed, a transmission state, and an accelerator pedal position.

Claims

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

a torque module that controls a torque output of an engine based on a driver torque request and that selectively increases said torque output based on a chassis torque request; and

a chassis request evaluation module that selectively prevents said increase of said torque output based on at least one of a vehicle speed, a transmission state, and an accelerator pedal position.

2. The engine control system of claim 1 wherein said chassis request evaluation module prevents said increase when said transmission state is one of neutral, park, and reverse.

3. The engine control system of claim 1 wherein said chassis request evaluation module prevents said increase when said accelerator pedal position is greater than a predetermined position.

4. The engine control system of claim 1 wherein said chassis request evaluation module prevents said increase when said vehicle speed is one of less than a predetermined minimum speed and greater than a predetermined maximum speed.

5. The engine control system of claim 1 wherein said chassis request evaluation module selectively prevents said increase based on at least one of said vehicle speed, said transmission state, said accelerator pedal position, and a driven wheel speed.

6. The engine control system of claim 5 wherein said chassis request evaluation module prevents said increase when said driven wheel speed is greater than an undriven wheel speed.

7. The engine control system of claim 1 wherein said chassis request evaluation module selectively prevents said increase based on at least one of said vehicle speed, said transmission state, said accelerator pedal position, and whether a fault is diagnosed in at least one of a sensor and a module of said vehicle.

8. The engine control system of claim 1 wherein said chassis request evaluation module selectively prevents said increase based on at least one of said vehicle speed, said transmission state, said accelerator pedal position, and whether said chassis torque request is greater than a predetermined maximum torque of said engine.

9. The engine control system of claim 1 wherein said chassis request evaluation module tracks a period from when said torque module exits said increasing to when a second chassis torque request is generated and diagnoses a short request event when said period is less than a predetermined period.

10. The engine control system of claim 9 wherein said chassis request evaluation module disables future increases of said torque output based on future chassis torque requests when a predetermined number of short request events are diagnosed within a second predetermined period.

11. The engine control system of claim 1 wherein said chassis request evaluation module limits said torque output based on said driver torque request when a vehicle response differs from an expected response a predetermined period after said increase.

12. The engine control system of claim 1 wherein said chassis request evaluation module limits said torque output based on said driver torque request when a wheel drag event continues a predetermined period after said increase.

13. The engine control system of claim 1 further comprising a chassis control module that generates said chassis torque request,

wherein said chassis request evaluation module transmits fault data to said chassis control module after at least one of preventing and disabling said increase.

14. The engine control system of claim 1 wherein said torque module increases at least one engine operating parameter based on said chassis torque request.

15. An engine control method comprising:

controlling a torque output of an engine based on a driver torque request;

selectively increasing said torque output based on a chassis torque request; and

selectively preventing said increasing of said torque output based on at least one of a vehicle speed, a transmission state, and an accelerator pedal position.

16. The engine control method of claim 15 further comprising preventing said increasing when said transmission state is one of neutral, park, and reverse.

17. The engine control method of claim 15 further comprising preventing said increasing when said accelerator pedal position is greater than a predetermined position.

18. The engine control method of claim 15 further comprising preventing said increasing when said vehicle speed is one of less than a predetermined minimum speed and greater than a predetermined maximum speed.

19. The engine control method of claim 15 further comprising selectively preventing said increasing based on at least one of said vehicle speed, said transmission state, said accelerator pedal position, and a driven wheel speed.

20. The engine control method of claim 19 further comprising preventing said increasing when said driven wheel speed is greater than an undriven wheel speed.

21. The engine control method of claim 15 further comprising selectively preventing said increasing based on at least one of said vehicle speed, said transmission state, said accelerator pedal position, and whether a fault is diagnosed in at least one of a sensor and a module of said vehicle.

22. The engine control method of claim 15 further comprising selectively preventing said increasing based on at least one of said vehicle speed, said transmission state, said accelerator pedal position, and whether said chassis torque request is greater than a predetermined maximum torque of said engine.

23. The engine control method of claim 15 further comprising:

tracking a period from when said increasing is exited to when a second chassis torque request is generated; and

diagnosing a short request event when said period is less than a predetermined period.

24. The engine control method of claim 23 further comprising disabling future increases of said torque output based on future chassis torque requests when a predetermined number of short request events are diagnosed within a second predetermined period.

25. The engine control method of claim 15 further comprising limiting said torque output based on said driver torque request when a vehicle response differs from an expected response a predetermined period after said increasing has begun.

26. The engine control method of claim 15 further comprising limiting said torque output based on said driver torque request when a wheel drag event continues a predetermined period after said increasing has begun.

27. The engine control method of claim 15 further comprising:

generating said chassis torque request using a chassis control module; and

transmitting fault data to said chassis control module after at least one of preventing and disabling said increasing.

28. The engine control system of claim 15 wherein said increasing said torque output of said engine comprises increasing at least one engine operating parameter based on said chassis torque request.