Method and system for simulating various engine operating conditions to evaluate engine emissions test equipment

• US 8,495,908 B2
• Filed: 09/21/2011
• Issued: 07/30/2013
• Est. Priority Date: 09/21/2011
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Nagy, Donald B.
• Primary Examiner(s): Kirkland, III, Freddie
• Application Number:
  US13/238,529
• Publication Number:
  US 20130068002A1
• Time in Patent Office: 678 Days
• Field of Search: 731/146.9, 731/147.1, 731/147.5, 731/160.2, 731/160.4, 731/160.5, 731/160.6
• US Class Current: 73/114.13
• CPC Class Codes: G01M 15/02 Details or accessories of testing apparatus

Abstract

A system according to the principles of the present disclosure includes an engine control module, a valve control module, and a level determination module. The engine control module controls an engine mounted in one of an engine dynamometer and a chassis dynamometer based on a predetermined schedule specifying a desired speed with respect to time. The valve control module controls a valve to inject a first quantity of a substance into an exhaust system to simulate the engine outputting an emission. The level determination module determines an emissions level of the emission in the exhaust system based on the predetermined schedule and the first quantity.

Claims

1. A system comprising:

an engine control module that controls an engine mounted in one of an engine dynamometer and a chassis dynamometer based on a predetermined schedule specifying a desired speed with respect to time;

a valve control module that controls a valve to inject a first quantity of a substance into an exhaust system to simulate the engine outputting an emission; and

a level determination module that determines an emissions level of the emission in the exhaust system based on the predetermined schedule and the first quantity.

2. The system of claim 1, wherein the engine is mounted in the engine dynamometer, the desired speed is an engine speed, and the predetermined schedule specifies an engine load with respect to time.

3. The system of claim 1, wherein the engine is mounted in a vehicle on the chassis dynamometer and the desired speed is a wheel speed.

4. The system of claim 1, wherein the substance includes at least one of a liquid substance, a solid substance, and carbon dioxide.

5. The system of claim 1, wherein the level determination module adjusts the emissions level based on a difference between the desired speed and an actual speed.

6. The system of claim 1, further comprising a power determination module that determines a desired power output of the engine based on the desired speed and that determines an actual power output of the engine based on an actual speed.

7. The system of claim 6, wherein the level determination module adjusts the emissions level based on a difference between the desired power output and the actual power output.

8. The system of claim 1, further comprising a mass determination module that determines a total mass of emissions output by the exhaust system during the predetermined schedule.

9. The system of claim 8, wherein the mass determination module determines the total mass based on the emissions level and an actual speed.

10. The system of claim 9, further comprising a quantity adjustment module that adjusts the first quantity to increase the total mass to a predetermined mass.

11. A method comprising:

controlling an engine mounted in one of an engine dynamometer and a chassis dynamometer based on a predetermined schedule specifying a desired speed with respect to time;

controlling a valve to inject a first quantity of a substance into an exhaust system to simulate the engine outputting an emission; and

determining an emissions level of the emission in the exhaust system based on the predetermined schedule and the first quantity.

12. The method of claim 11, wherein the engine is mounted in the engine dynamometer, the desired speed is an engine speed, and the predetermined schedule specifies an engine load with respect to time.

13. The method of claim 11, wherein the engine is mounted in a vehicle on the chassis dynamometer and the desired speed is a wheel speed.

14. The method of claim 11, wherein the substance includes at least one of a liquid substance, a solid substance, and carbon dioxide.

15. The method of claim 11, further comprising adjusting the emissions level based on a difference between the desired speed and an actual speed.

16. The method of claim 11, further comprising determining a desired power output of the engine based on the desired speed and determining an actual power output of the engine based on an actual speed.

17. The method of claim 16, further comprising adjusting the emissions level based on a difference between the desired power output and the actual power output.

18. The method of claim 11, further comprising determining a total mass of emissions output by the exhaust system during the predetermined schedule.

19. The method of claim 18, further comprising determining the total mass based on the emissions level and an actual speed.

20. The method of claim 19, further comprising adjusting the first quantity to increase the total mass to a predetermined mass.