System and method for controlling engine speed

• US 8,919,323 B2
• Filed: 03/27/2012
• Issued: 12/30/2014
• Est. Priority Date: 03/27/2012
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Kar, Krishnendu, Cribbins, Leon
• Primary Examiner(s): Gimie, Mahmoud
• Application Number:
  US13/431,317
• Publication Number:
  US 20130255625A1
• Time in Patent Office: 1,008 Days
• Field of Search: 123/319, 123/350, 123/352, 123/399, 123/696, 701/54, 701/101, 701/102, 701/110
• US Class Current: 123/352
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 37/02 one of the functions being ignition
• CPC Class Codes: F02D 41/0002 Controlling intake air
• 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
• CPC Class Codes: F02D 43/00 Conjoint electrical control of two or more functions, e.g. ignition, fuel-air mixture, recirculation, supercharging or exhaust-gas treatment
• CPC Class Codes: F02D 43/04 using only digital means

Abstract

A system according to the principles of the present disclosure includes a gain determination module, a desired torque determination module, and an engine operation control module. The gain determination module determines a gain based on a desired speed of an engine and a change rate of an actual speed of the engine. The desired torque determination module determines a desired torque based on the gain and a difference between the actual speed and the desired speed. The engine operation control module controls at least one of a throttle area, a spark timing, and a fueling rate based on the desired torque.

Claims

1. A system comprising:

a gain determination module that determines a gain based on a desired speed of an engine and a change rate of an actual speed of the engine;

a desired torque determination module that determines a desired torque based on the gain and a difference between the actual speed and the desired speed; and

an engine operation control module that controls at least one of a throttle area, a spark timing, and a fueling rate based on the desired torque.

2. The system of claim 1, wherein the gain includes a proportional gain and an integral gain.

3. The system of claim 2, wherein the gain determination module decreases the integral gain when the difference between the actual speed and the desired speed is greater than a first speed.

4. The system of claim 2, wherein the desired torque determination module refrains from adjusting the desired torque faster than a first rate when the desired torque is greater than a first torque.

5. A system comprising:

a gain determination module that determines a gain based on a desired speed of an engine and a change rate of an actual speed of the engine;

a desired torque determination module that determines a desired torque based on the gain and a difference between the actual speed and the desired speed;

an engine operation control module that controls at least one of a throttle area, a spark timing, and a fueling rate based on the desired torque; and

an actual speed determination module that determines the actual speed during consecutive firing periods, wherein a firing period is a period between consecutive firing events.

6. A system comprising:

a gain determination module that determines a gain based on a desired speed of an engine and a change rate of an actual speed of the engine;

a desired torque determination module that determines a desired torque based on the gain and a difference between the actual speed and the desired speed; and

an engine operation control module that controls at least one of a throttle area, a spark timing, and a fueling rate based on the desired torque, wherein the gain determination module selectively increases the gain when a first condition is satisfied, and the first condition is satisfied when a pressure ratio across a throttle valve is less than a first ratio and the change rate of the actual speed is less than a first rate.

7. The system of claim 6, further comprising a first rate determination module that determines the first rate based on at least one of the desired speed, an accessory load, and whether a garage shift is in progress, wherein the garage shift is a transmission shift from one of park and neutral to one of drive and reverse.

8. The system of claim 6, wherein the gain determination module increases the gain for a first predetermined period that is based on a delay between a throttle area increase and a manifold pressure increase in response to the throttle area increase.

9. The system of claim 8, wherein the gain determination module stops increasing the gain when the first predetermined period ends and refrains from increasing the gain for a second predetermined period after the first predetermined period ends.

10. The system of claim 6, further comprising a throttle area determination module that determines the throttle area based on a desired manifold pressure when the first condition is satisfied.

11. A method comprising:

determining a gain based on a desired speed of an engine and a change rate of an actual speed of the engine;

determining a desired torque based on the gain and a difference between the actual speed and the desired speed; and

controlling at least one of a throttle area, a spark timing, and a fueling rate based on the desired torque.

12. The method of claim 11, wherein the gain includes a proportional gain and an integral gain.

13. The method of claim 12, further comprising decreasing the integral gain when the difference between the actual speed and the desired speed is greater than a first speed.

14. The method of claim 12, further comprising refraining from adjusting the desired torque faster than a first rate when the desired torque is greater than a first torque.

15. A method comprising:

determining a gain based on a desired speed of an engine and a change rate of an actual speed of the engine;

determining a desired torque based on the gain and a difference between the actual speed and the desired speed;

controlling at least one of a throttle area, a spark timing, and a fueling rate based on the desired torque; and

determining the actual speed during consecutive firing periods, wherein a firing period is a period between consecutive firing events.

16. A method comprising:

determining a gain based on a desired speed of an engine and a change rate of an actual speed of the engine;

determining a desired torque based on the gain and a difference between the actual speed and the desired speed;

controlling at least one of a throttle area, a spark timing, and a fueling rate based on the desired torque; and

selectively increasing the gain when a first condition is satisfied, wherein the first condition is satisfied when a pressure ratio across a throttle valve is less than a first ratio and the change rate of the actual speed is less than a first rate.

17. The method of claim 16, further comprising determining the first rate based on at least one of the desired speed, an accessory load, and whether a garage shift is in progress, wherein the garage shift is a transmission shift from one of park and neutral to one of drive and reverse.

18. The method of claim 16, further comprising increasing the gain for a first predetermined period that is based on a delay between a throttle area increase and a manifold pressure increase in response to the throttle area increase.

19. The method of claim 18, further comprising stop increasing the gain when the first predetermined period ends and refraining from increasing the gain for a second predetermined period after the first predetermined period ends.

20. The method of claim 16, further comprising determining the throttle area based on a desired manifold pressure when the first condition is satisfied.