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БИБЛИОТЕКА ПАТЕНТОВ НА ИЗОБРЕТЕНИЯ

Fuel injection control during start-up


Классы МПК:F02M25/14 для добавления антидетонационных реагентов, не отнесенных к подгруппам  25/022
Автор(ы): Bidner, David Karl (Livonia, MI, US)
Roth, John M. (Grosse Ile, MI, US)
Peters, Mark (Wolverine Lake, MI, US)
Патентообладатель(и): Ford Global Technologies, LLC (Dearborn, MI, US)
Приоритеты:
подача заявки
08.04.2011
публикация патента
20.09.2011

РЕФЕРАТ (Abstract)

A method of operation of an internal combustion engine including an intake valve coupled to a combustion chamber, and a port fuel injector positioned upstream of the intake valve in an intake manifold including a throttle, the port fuel injector fluidly coupled to a fuel rail included in a fuel delivery system housing a fuel at least partially composed of alcohol. The method including, during a start-up operation when the temperature of the engine is below a threshold value and fuel is actively being injected into the intake manifold, adjusting a cone angle of a fuel spray from the port fuel injector, via adjustment of the throttle and/or fuel delivery system, based on the position of the intake valve.
Полный текст Патента US 8020532 + PDF


ФОРМУЛА ИЗОБРЕТЕНИЯ (CLAIMS)

The invention claimed is:

1. A method or operating an engine including a port fuel injector, comprising: during a start-up operation when engine temperature is below a threshold and fuel is actively injected by the injector with an open intake valve, decreasing a cone angle of a fuel spray from the injector; and then increasing the cone angle after a selected number of combustion events, wherein the cone angle is further adjusted based on a fuel alcohol content.

2. The method according to claim 1 wherein the cone angle is reduced as an amount of alcohol in the fuel is increased.

3. The method according to claim 1 wherein the start-up operation includes a crank-start sequence.

4. A method of operating an engine including a port fuel injector, comprising: during a start-up operation when engine temperature is below a threshold value and before manifold pressure is pumped down below a pressure threshold, during active injection of fuel by the injector, and during intake to exhaust valve overlap conditions, decreasing a fuel spray cone from the injector, where an amount of decrease is based on alcohol content of the fuel.

5. The method according to claim 4 wherein the fuel injection event occurs at least partially during an open intake valve.

6. The method according to claim 5 wherein the throttle is adjusted to increase a manifold air pressure and the fuel injection event occurs substantially while the intake valve is open.

7. The method according to claim 4 further comprising, subsequent to start-up operation when the temperature of the engine has surpassed the threshold value, increasing the cone angle.

8. The method according to claim 4 wherein a fuel rail pressure is decreased via actuation of one or more pumps and/or valves within the fuel delivery system, to decrease the cone angle.


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