Green start engine control systems and methods

• US 20080314349A1
• Filed: 06/25/2007
• Published: 12/25/2008
• Est. Priority Date: 06/25/2007
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH, Robert Bosch LLC (Robert Bosch GmbH)
• Original Assignee: Robert Bosch GmbH
• Inventors: Oertel, Heiko, Knieps, Peter
• Application Number:
  US11/821,668
• Publication Number:
  US 20080314349A1
• Time in Patent Office: Days
• US Class Current: 123/179.5
• CPC Class Codes: F02D 2041/3881 with multiple common rails, e.g. one rail per cylinder bank, or a high pressure rail and a low pressure rail
• CPC Class Codes: F02D 37/02 one of the functions being ignition
• CPC Class Codes: F02D 41/062 for starting F02D41/061 takes precedence
• CPC Class Codes: F02D 41/3818 for petrol engines
• CPC Class Codes: F02N 11/10 Safety devices F02N11/08 takes precedence
• CPC Class Codes: F02P 5/1504 with particular means during a transient phase, e.g. acceleration, deceleration, gear change during starting F02P5/1506
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method of starting an engine having a fuel rail, one or more fuel injectors, and one or more spark plugs. In one embodiment, the method includes initializing a starting operation of the engine and suppressing the engine from starting by retarding a spark timing of the one or more spark plugs from normal spark timing. The method also includes purging, while the spark timing is being retarded, the fuel rail of the engine by operating the one or more fuel injectors. Additionally, the method includes advancing the spark timing after a first duration has passed or the engine has started.

Claims

1. A method of starting an engine having a fuel rail, one or more fuel injectors, and one or more spark plugs, the method comprising:

initializing a starting operation of the engine;

suppressing the engine from starting by retarding a spark timing of the one or more spark plugs from normal spark timing;

purging, while the spark timing is being retarded, the fuel rail of the engine by operating the one or more fuel injectors; and

advancing the spark timing after a first duration has passed or the engine has started.

2. The method of claim 1, further comprising supporting an idle operation of the engine after the engine has started by altering spark parameters of the one or more spark plugs.

3. The method of claim 2, further comprising supporting the idle operation of the engine until the engine is operating at a pre-determined operating speed or a second duration has passed.

4. The method of claim 2, further comprising altering spark parameters by increasing a rate with which spark timing is altered.

5. The method of claim 2, further comprising altering spark parameters by setting a minimum spark boundary of the one or more spark plugs.

6. The method of claim 1, further comprising supporting an idle operation of the engine by compensating for fuel supply deviations between a first bank of the fuel rail and a second bank of the fuel rail.

7. The method of claim 6, wherein compensating for fuel supply deviations includes operating fuel injectors associated with the first bank differently than fuel injectors associated with the second bank.

8. The method of claim 1, wherein retarding the spark timing includes utilizing a green start spark map, the green start spark map varying with engine speed.

9. A method of starting an engine having a fuel injection system, the engine being installed in a vehicle having an associated fuel line and fuel tank, the fuel injection system and fuel line being initially substantially air filled, the method comprising:

initializing a starting operation of the engine;

retarding a spark timing of one or more spark plugs included in the fuel injection system;

purging air from of the fuel line and burning residual fuel from the fuel rail;

supplying the fuel rail with fuel from the fuel tank via the fuel line; and

advancing the spark timing of the one or more spark plugs included in the fuel injection system upon the engine of the vehicle starting based on fuel delivered to fuel injectors of the fuel injection system from the fuel tank of the vehicle.

10. The method of claim 9, further comprising advancing the spark timing of the one or more spark plugs included in the fuel injection system upon exhaustion of a first pre-determined duration.

11. The method of claim 10, further comprising altering spark parameters, after the engine has started, by increasing an aggressiveness with which the spark timing is altered or or by setting a minimum spark boundary of the one or more spark plugs.

12. The method of claim 9, further comprising supporting an idle operation of the engine by compensating for fuel supply deviations between a first bank of the fuel rail and a second bank of the fuel rail.

13. The method of claim 12, wherein compensating for fuel supply deviations includes operating fuel injectors associated with the first bank differently than fuel injectors associated with the second bank.

14. The method of claim 13, further comprising altering the compensation for fuel supply deviations based at least partially on engine speed.

15. The method of claim 9, further comprising retarding the spark timing using a spark map based at least partially on engine speed and engine temperature.

16. A method of starting an engine of a vehicle, the engine having a fuel injection system, the vehicle having a fuel tank and a fuel line that is configured to supply the fuel injection system of the engine with fuel from the fuel tank, the method comprising:

initiating a green start process, the green start process being different from a normal start process;

actuating an ignition operation of the engine;

retarding a spark timing of spark plugs included in the engine for a first duration;

advancing the spark timing upon the first duration being exhausted;

starting the engine of the vehicle upon the spark timing being advanced; and

supporting an idle operation of the engine by altering spark parameters of the spark plugs.

17. The method of claim 16, further comprising altering spark parameters by increasing an aggressiveness with which spark timing is altered.

18. The method of claim 16, further comprising altering spark parameters by setting a minimum spark boundary of the one or more spark plugs.

19. The method of claim 16, further comprising supporting the idle operation of the engine by compensating for fuel supply deviations between a first bank of the fuel rail and a second bank of a fuel rail included in the fuel injection system.

20. The method of claim 19, wherein compensating for fuel supply deviations includes operating fuel injectors associated with the first bank differently than fuel injectors associated with the second bank.