RESERVE TORQUE MANAGEMENT FOR ENGINE SPEED CONTROL

• US 20090118965A1
• Filed: 01/10/2008
• Published: 05/07/2009
• Est. Priority Date: 11/02/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: Livshiz, Michael, Chynoweth, Scott J., Kaiser, Jeffrey M., Whitney, Christopher E., Jin, Ning, Shupe, Todd R.
• Granted Patent: US 7,650,219 B2
• Time in Patent Office: Days
• US Class Current: 701/101
• 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 2200/023 Temperature of lubricating oil or working fluid
• CPC Class Codes: F02D 2200/703 Atmospheric pressure
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 2250/22 by keeping a torque reserve, i.e. with temporarily reduced drive train or engine efficiency
• CPC Class Codes: F02D 31/002 controlling air supply
• CPC Class Codes: F02D 37/02 one of the functions being ignition

Abstract

An engine control module comprises a base reserve module, a power steering reserve module, a reserve torque module, first and second engine actuator modules, and an engine speed control module. The base reserve module determines a base reserve torque. The power steering reserve module determines a power steering reserve torque. The reserve torque module determines a first reserve torque based on the base reserve torque, the power steering reserve torque, and at least one of an oil temperature of an engine and a barometric pressure. The first and second engine actuator modules control first and second actuators of the engine, respectively. The engine speed control module instructs the first engine actuator module to produce a first torque output from the engine and instructs the second engine actuator module to produce a second torque output from the engine.

Claims

1. An engine control module comprising:

a base reserve module that determines a base reserve torque;

a power steering reserve module that determines a power steering reserve torque;

a reserve torque module that determines a first reserve torque based on said base reserve torque, said power steering reserve torque, and at least one of an oil temperature of an engine and a barometric pressure;

first and second engine actuator modules that control first and second actuators of the engine, respectively; and

an engine speed control module that instructs the first engine actuator module to produce a first torque output from the engine and that instructs the second engine actuator module to produce a second torque output from the engine, wherein said second torque output is approximately equal to a sum of said first reserve torque and said first torque output.

2. The engine control module of claim 1 wherein said engine speed control module, in order to produce said first torque output from the engine, instructs said first engine actuator module to produce said first torque output and said second engine actuator module to produce said second torque output.

3. The engine control module of claim 1 wherein said first engine actuator module comprises a spark control module and said second engine actuator module comprises a throttle area control module.

4. The engine control module of claim 1 wherein said base reserve module determines said base reserve torque based on air per cylinder (APC) of said engine and engine speed (RPM).

5. The engine control module of claim 4 further comprising:

a stabilized RPM module that determines a stabilized RPM based on said RPM, a desired RPM, and a predetermined RPM value; and

a stabilized APC module that determines a stabilized APC based on said APC, a desired APC, and a predetermined APC value,

wherein said base reserve module determines said base reserve torque based on said stabilized RPM and said stabilized APC.

6. The engine control module of claim 1 wherein said power steering reserve module determines said power steering reserve torque based on power steering angle and rate of change of said power steering angle.

7. The engine control module of claim 1 wherein said reserve torque module determines said first reserve torque based on said oil temperature and said barometric pressure.

8. The engine control module of claim 1 wherein an increase in said oil temperature results in a decrease in said first reserve torque.

9. The engine control module of claim 1 wherein an increase in said barometric pressure results in a decrease in said first reserve torque.

10. The engine control module of claim 1 further comprising a reserve torque limits module that applies at least one of an upper limit and a lower limit to said first reserve torque.

19. The method of claim 1 further comprises applying at least one of an upper limit and a lower limit to said first reserve torque.

11. A method comprising:

determining a base reserve torque;

determining a power steering reserve torque;

determining a first reserve torque based on said base reserve torque, said power steering reserve torque, and at least one of an oil temperature of an engine and a barometric pressure;

adjusting a first engine actuator to produce a first torque output from the engine; and

adjusting a second engine actuator to produce a second torque output from the engine,

wherein said second torque output is approximately equal to a sum of said first reserve torque and said first torque output.

12. The method of claim 11 further comprising producing said first torque output from the engine by adjusting said first engine actuator to produce said first torque output and by adjusting said second engine actuator to produce said second torque output.

13. The method of claim 11 wherein said base reserve is determined based on air per cylinder (APC) of the engine and engine speed (RPM).

14. The method of claim 13 further comprising:

determining a stabilized RPM based on said RPM, a desired RPM, and a predetermined RPM value; and

determining a stabilized APC based on said APC, a desired APC, and a predetermined APC value,

wherein said base reserve torque is determined based on said stabilized RPM and said stabilized APC.

15. The method of claim 11 wherein said power steering reserve torque is determined based on power steering angle and rate of change of said power steering angle.

16. The method of claim 11 wherein said first reserve torque is determined based on said oil temperature and said barometric pressure.

17. The method of claim 11 wherein an increase in said oil temperature results in a decrease in said first reserve torque.

18. The method of claim 11 wherein an increase in said barometric pressure results in a decrease in said first reserve torque.