Use of torque model at virtual engine conditions

• US 9,002,550 B2
• Filed: 01/14/2008
• Issued: 04/07/2015
• Est. Priority Date: 07/02/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Brennan, Daniel G., Wozniak, Leonard G., Simon, Robert C. Jr., Kaiser, Jeffrey M., Ritzen, Emil, Reimark, Mats A., Backman, Richard M., Wall, Magnus, Magnusson, Thomas
• Primary Examiner(s): MANCHO, RONNIE M
• Application Number:
  US12/013,699
• Publication Number:
  US 20090012665A1
• Time in Patent Office: 2,640 Days
• Field of Search: 701/70, 701/84, 701/85, 701/86, 701/99, 701/101, 701/102, 701/104, 701/105, 701/108, 701/110, 606/051, 123/559.1, 123/90.15, 123/687, 123/676, 903/902
• US Class Current: 701/22
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 2220/14 Synchronous machines
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/443 Torque
• CPC Class Codes: B60L 2240/662 Temperature
• CPC Class Codes: B60L 2260/44 by parameter estimation
• CPC Class Codes: B60L 3/0023 Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 40/12 related to parameters of the vehicle itself , e.g. tyre models
• CPC Class Codes: F02D 2200/1004 Estimation of the output torque
• CPC Class Codes: F02D 2200/1006 Engine torque losses, e.g. friction or pumping losses or losses caused by external loads of accessories
• 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 41/0002 Controlling intake air
• CPC Class Codes: F02D 41/0065 Specific aspects of external EGR control constructional details of EGR system F02M26/00
• CPC Class Codes: F02D 41/0087 Selective cylinder activation, i.e. partial cylinder operation deceleration cut-off F02D41/123
• CPC Class Codes: F02D 41/1406 : with use of a optimisation method, e.g. iteration
• CPC Class Codes: Y02T 10/40 : Engine management systems
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y10S 903/902 : Prime movers comprising electrical and internal combustion motors

Abstract

A torque estimation system for a vehicle comprises an operating parameter module, a torque estimation module, and an estimation control module. The operating parameter module determines an estimated engine operating parameter based on engine speed. The torque estimation module estimates engine torque based on the engine speed and the estimated engine operating parameter. The estimation control module provides a plurality of engine speeds to the operating parameter module and the torque estimation module to determine estimated engine torque as a function of engine speed.

Claims

1. A torque estimation system for a vehicle, comprising:

an estimation control module that selectively outputs a first engine speed and a second engine speed;

an operating parameter module that determines a first set of M estimated engine operating parameters based on the first engine speed and that determines a second set of the M estimated engine operating parameters based on the second engine speed, wherein M is an integer greater than one;

a torque estimation module that estimates a first set of M engine torques based on the first set of M estimated engine operating parameters, respectively, and the first engine speed and that estimates a second set of M engine torques based on the second set of M estimated engine operating parameters, respectively, and the second engine speed; and

a hybrid control module that controls an electric motor of the vehicle based upon the first and second sets of M engine torques.

2. The torque estimation system of claim 1 wherein the operating parameter module determines at least one of air per cylinder and fuel per cylinder.

3. The torque estimation system of claim 1 wherein the operating parameter module determines a first minimum air per cylinder (APC) required at the first engine speed and determines a second minimum APC required at the second engine speed.

4. The torque estimation system of claim 3 wherein the operating parameter module:

determines a third minimum APC required for reliable throttle control for the first engine speed, a fourth minimum APC required for reliable fuel injection for the first engine speed, and a fifth minimum APC required for combustion stability for the first engine speed;

determines the first minimum APC based on one of the third, fourth, and fifth minimum APCs;

determines a sixth minimum APC required for reliable throttle control for the second engine speed, a seventh minimum APC required for reliable fuel injection for the second engine speed, and an eighth minimum APC required for combustion stability for the second engine speed; and

determines the second minimum APC based on one of the sixth, seventh, and eighth minimum APCs.

5. The torque estimation system of claim 4 wherein the operating parameter module:

determines the first minimum APC based on a maximum one of the third, fourth, and fifth minimum APCs; and

determines the second minimum APC based on a maximum one of the sixth, seventh, and eighth minimum APCs.

6. The torque estimation system of claim 1 wherein the operating parameter module determines a first maximum air per cylinder (APC) at the first engine speed and determines a second maximum APC at the second engine speed.

7. The torque estimation system of claim 1 wherein:

the operating parameter module further determines a third set of the M estimated engine operating parameters based on the first engine speed and a first number of cylinders of an engine being active and determines a fourth set of the M estimated engine operating parameters based on the second engine speed and a second number of cylinders of the engine being active; and

the torque estimation module further estimates a third set of M engine torques based on the third set of M estimated engine operating parameters, respectively, and the first engine speed and that estimates a fourth set of M engine torques based on the fourth set of M estimated engine operating parameters, respectively, and the second engine speed.

8. The torque estimation system of claim 7 wherein said engine includes a total of N cylinders, said first number is equal to N, and said second number is equal to N divided by two.

9. The torque estimation system of claim 1 further comprising a cam phaser position estimation module that estimates a first set of M cam phaser positions based on the first set of M estimated engine operating parameters, respectively, and the first engine speed, and that estimates a second set of M cam phaser positions based on the second set of M estimated engine operating parameters, respectively, and the second engine speed,

wherein the torque estimation module estimates the first set of M engine torques further based on the first set of M cam phaser positions, respectively, and

wherein the torque estimation module estimates the second set of M engine torques further based on the second set of M cam phaser positions, respectively.

10. The torque estimation system of claim 1 further comprising a spark advance estimation module that estimates a first set of M spark advance values based on the first set of M estimated engine operating parameters, respectively, and the first engine speed, and that estimates a second set of M spark advance values based on the second set of M estimated engine operating parameters, respectively, and the second engine speed,

wherein the torque estimation module estimates the first set of M engine torques further based on the first set of M spark advance values, respectively, and

wherein the torque estimation module estimates the second set of M engine torques further based on the second set of M spark advance values, respectively.

11. The torque estimation system of claim 1 further comprising exhaust gas recirculation (EGR) estimation module that estimates a first set of M openings of an EGR valve based on the first set of M estimated engine operating parameters, respectively, and the first engine speed, and that estimates a second set of M openings of the EGR valve based on the second set of M estimated engine operating parameters, respectively, and the second engine speed,

wherein the torque estimation module estimates the first set of M engine torques further based on the first set of M openings of the EGR valve, respectively, and

wherein the torque estimation module estimates the second set of M engine torques further based on the second set of M openings of the EGR valve, respectively.

12. The torque estimation system of claim 1 further comprising an engine control module that controls an internal combustion engine of said vehicle based upon the first and second sets of M engine torques.

13. A torque estimation method for a vehicle, comprising:

selectively outputting a first engine speed and a second engine speed;

determining a first set of M estimated engine operating parameters based on the first engine speed, wherein M is an integer greater than one;

determining a second set of the M estimated engine operating parameters based on the second engine speed;

estimating a first set of M engine torques based on the first set of M estimated engine operating parameters, respectively, and the first engine speed;

estimating a second set of M engine torques based on the second set of M estimated engine operating parameters, respectively, and the second engine speed; and

controlling an electric motor of the vehicle based upon the first and second sets of M engine torques.

14. The torque estimation method of claim 13 wherein the first and second sets of M estimated engine operating parameters each include at least one of air per cylinder and fuel per cylinder.

15. The torque estimation method of claim 13 wherein:

determining the first set of the M estimated engine operating parameters includes determining a first minimum air per cylinder (APC) required at the first engine speed; and

determining the second set of the M estimated engine operating parameters includes determining a second minimum APC required at the second engine speed.

16. The torque estimation method of claim 15 further comprising:

determining a third minimum APC required for reliable throttle control for the first engine speed, a fourth minimum APC required for reliable fuel injection for the first engine speed, and a fifth minimum APC required for combustion stability for the first engine speed;

determining the first minimum APC based on one of the third, fourth, and fifth minimum APCs;

determining a sixth minimum APC required for reliable throttle control for the second engine speed, a seventh minimum APC required for reliable fuel injection for the second engine speed, and an eighth minimum APC required for combustion stability for the second engine speed; and

determining the second minimum APC based on one of the sixth, seventh, and eighth minimum APCs.

17. The torque estimation method of claim 16 further comprising:

determining the first minimum APC based on a maximum one of the third, fourth, and fifth minimum APCs; and

determining the second minimum APC based on a maximum one of the sixth, seventh, and eighth minimum APCs.

18. The torque estimation method of claim 13 wherein:

determining the first set of the M estimated engine operating parameters includes determining a first maximum air per cylinder (APC) at the first engine speed; and

determining the second set of the M estimated engine operating parameters includes determining a second maximum APC at the second engine speed.

19. The torque estimation method of claim 13 further comprising:

determining a third set of the M estimated engine operating parameters based on the first engine speed and a first number of cylinders of an engine being active;

determining a fourth set of the M estimated engine operating parameters based on the second engine speed and a second number of cylinders of the engine being active;

estimating a third set of M engine torques based on the third set of M estimated engine operating parameters, respectively, and the first engine speed; and

estimating a fourth set of M engine torques based on the fourth set of M estimated engine operating parameters, respectively, and the second engine speed.

20. The torque estimation method of claim 19 wherein said engine includes a total of N cylinders, said first number is equal to N, and said second number is equal to N divided by two.

21. The torque estimation method of claim 13 further comprising:

estimating a first set of M cam phaser positions based on the first set of M estimated engine operating parameters, respectively, and the first engine speed;

estimating a second set of M cam phaser positions based on the second set of M estimated engine operating parameters, respectively, and the second engine speed;

estimating the first set of M engine torques further based on the first set of M cam phaser positions, respectively; and

estimating the second set of M engine torques further based on the second set of M cam phaser positions, respectively.

22. The torque estimation method of claim 13 further comprising:

estimating a first set of M spark advance values based on the first set of M estimated engine operating parameters, respectively, and the first engine speed;

estimating a second set of M spark advance values based on the second set of M estimated engine operating parameters, respectively, and the second engine speed;

estimating the first set of M engine torques further based on the first set of M spark advance values, respectively; and

estimating the second set of M engine torques further based on the second set of M spark advance values, respectively.

23. The torque estimation method of claim 13 further comprising:

estimating a first set of M openings of an exhaust gas recirculation (EGR) valve based on the first set of M estimated engine operating parameters, respectively, and the first engine speed;

estimating a second set of M openings of the EGR valve based on the second set of M estimated engine operating parameters, respectively, and the second engine speed;

estimating the first set of M engine torques further based on the first set of M openings of the EGR valve, respectively; and

estimating the second set of M engine torques further based on the second set of M openings of the EGR valve, respectively.

24. The torque estimation method of claim 13 further comprising controlling an internal combustion engine of said vehicle based upon the first and second sets of M engine torques.