Method of determining valve events to optimize engine operating parameters

• US 6,701,903 B1
• Filed: 08/22/2002
• Issued: 03/09/2004
• Est. Priority Date: 08/22/2002
• Status: Expired due to Fees

• Current Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Original Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Inventors: Mianzo, Lawrence Andrew, Collins, Brett Denton
• Primary Examiner(s): WOLFE JR, WILLIS RAY
• Application Number:
  US10/225,897
• Publication Number:
  US 20040035402A1
• Time in Patent Office: 565 Days
• Field of Search: 123/90.11, 123/90.12, 123/90.15, 123/90.16, 123/90.17, 123/90.18, 123/295, 123/305, 123/478, 123/480, 123/486, 123/568.11, 123/568.13, 123/568.14, 701/103, 701/104, 701/106, 701/115, 731/173, 731/181, 706/15, 706/16, 706/23
• US Class Current: 123/568.14
• CPC Class Codes: F02D 13/0215 changing the valve timing only
• CPC Class Codes: F02D 13/0265 Negative valve overlap for temporarily storing residual gas in the cylinder
• CPC Class Codes: F02D 2041/001 for engines with variable valve actuation
• CPC Class Codes: F02D 41/0002 Controlling intake air
• CPC Class Codes: F02D 41/006 using internal EGR control of valve overlap for internal EGR F02D13/0261; arrangements for internal EGR F02M26/01
• CPC Class Codes: F02D 41/2425 Particular ways of programming the data
• CPC Class Codes: F02D 41/2432 Methods of calibration
• CPC Class Codes: F02D 41/2451 characterised by what is learned or calibrated
• CPC Class Codes: F02D 41/2464 Characteristics of actuators
• CPC Class Codes: F02M 26/01 Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method for determining valve timing events to optimize operating parameters of an engine having a variable valve timing system over an entire operating range of the engine. The method includes setting combinations of intake valve opening and closing timing events and exhaust valve opening and closing timing events for a given engine speed. For each combination, a fuel conversion efficiency measure and an emissions measure of the engine at the given engine speed is obtained. Combinations which optimize a weighted cost function of the fuel conversion efficiency measure and the emission measure for a range of engine output torque settings at the given engine speed are then selected. This is repeated for each given engine speed across a range of engine speeds. A feed-forward map based on the selected combinations for the entire operating range of the engine is then assembled.

Claims

1. A method for determining valve timing events to optimize operating parameters of an engine having a variable valve timing system over an entire operating range of the engine, the method comprising the steps of:

(A) setting combinations of intake valve opening and closing timing events and exhaust valve opening and closing timing events for a given engine speed;

(B) for each combination, obtaining a fuel conversion efficiency measure and an emissions measure of the engine at the given engine speed;

(C) selecting combinations which optimize a weighted cost function of the fuel conversion efficiency measure and the emission measure for a range of engine output torque settings at the given engine speed;

(D) repeating steps A, B, and C for each given engine speed across a range of engine speeds; and

(E) assembling a feed-forward map based on the selected combinations for the entire operating range of the engine.

2. The method of claim 1 wherein:

the fuel conversion efficiency measure includes a fuel consumption measure.

3. The method of claim 1 wherein:

the emissions measure includes an estimated NO_x measure.

4. The method of claim 1 wherein:

the emissions measure includes an internal exhaust gas re-circulation measure.

5. The method of claim 1 further comprising:

controlling the engine in accordance with the selected combination for an engine output torque setting at a given engine speed.

6. A method for determining valve timing events to optimize operating parameters of an engine having a variable valve timing system over an entire operating range of the engine, the method comprising the steps of:

(A) setting combinations of intake valve and exhaust valve closing timing events for a given engine speed;

(B) for each combination, obtaining a fuel conversion efficiency measure and an emissions measure of the engine at the given engine speed;

(C) selecting combinations which optimize a weighted cost function of the fuel conversion efficiency measure and the emission measure for a range of engine output torque settings at the given engine speed;

(D) repeating steps A, B, and C for each given engine speed across a range of engine speeds; and

(E) assembling a feed-forward map based on the selected combinations for the entire operating range of the engine.

7. The method of claim 6 further comprising:

setting exhaust valve opening timing events as a function of engine speed.

8. The method of claim 6 further comprising:

setting intake valve opening timing events as a function of exhaust valve closing timing events.

9. The method of claim 6 further comprising:

controlling the engine in accordance with the selected combination for an engine output torque setting at a given engine speed.

10. A method for determining valve timing events to optimize operating parameters of an engine having a variable valve timing system over an entire operating range of the engine, the method comprising the steps of:

(A) setting combinations of intake valve and exhaust valve closing timing events for a given engine speed;

(B) for each combination, obtaining an exhaust gas residual measurement and an air charge measurement of the engine at the given engine speed;

(C) selecting combinations which optimize a weighted cost function of the exhaust gas residual measurement and the air charge measurement for a range of engine output torque settings at the given engine speed;

(D) repeating steps A, B, and C for each given engine speed across a range of engine speeds; and

(E) assembling a feed-forward map based on the selected combinations for the entire operating range of the engine.

11. The method of claim 10 further comprising:

setting exhaust valve opening timing events as a function of engine speed.

12. The method of claim 10 further comprising:

setting intake valve opening timing events as a function of exhaust valve closing timing events.

13. The method of claim 10 further comprising:

controlling the engine in accordance with the selected combination for an engine output torque setting at a given engine speed.