Injection device, an internal combustion engine, and a method for operating an injection device for gasoline and CNG

Patent metadata

Field	Value
Publication number	US-9845776-B2
Application number	US-201113997910-A
Country	US
Kind code	B2
Filing date	Nov 7, 2011
Priority date	Dec 27, 2010
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

An injection device for an internal combustion engine having a first injection system for injecting fuel having a first fuel composition, and a second injection system for the injection of fuel having a second fuel composition that has a lower ethanol component than the first fuel composition, the first injection system having at least one first fuel injector for injecting fuel having the first fuel composition both in the direction of a first intake orifice of a combustion chamber of the internal combustion engine, and in the direction of a second intake orifice of the combustion chamber, in which the second injection system has a second fuel injector for injecting fuel having the second fuel composition essentially only in the direction of the first intake orifice, and a separate third fuel injector for injecting fuel having the second fuel composition essentially only in the direction of the second intake orifice.

First claim

What is claimed is:

1. An injection device for an internal combustion engine, comprising:
a first injection system for injecting fuel having a first fuel composition based on natural gas; and
a second injection system for injecting fuel having a second fuel composition based on gasoline;
wherein the first injection system has one first fuel injector for injecting fuel having the first fuel composition in the direction of both a first intake opening of a combustion chamber of the internal combustion engine and a second intake opening of the combustion chamber;
wherein the second injection system has a second fuel injector for injecting fuel having the second fuel composition essentially only in the direction of the first intake opening, and a separate third fuel injector for injecting fuel having the second fuel composition essentially only in the direction of the second intake opening.

2. The injection device of claim 1 , wherein the second fuel injector and the third fuel injector are situated in an intake manifold leading to the combustion chamber, the second fuel injector and the third fuel injector being situated in a lower wall section, facing the combustion chamber, of the intake manifold.

3. The injection device of claim 1 , wherein the first fuel injector is situated in the intake manifold, the first fuel injector being situated in an upper wall section, facing away from the combustion chamber, of the intake manifold.

4. The injection device of claim 1 , wherein the intake manifold between the second injection system and the combustion chamber is separated by an inner separating wall into a first intake duct which is discharged into the first intake opening, and a second intake duct which is discharged into the second intake opening, the second fuel injector being situated in the region of the first intake duct, and the third fuel injector being situated in the region of the second intake duct.

5. The injection device of claim 1 , wherein a distance between the second fuel injector and the first intake opening, and a distance between the third fuel injector and the second intake opening is smaller in each case than a distance between the first fuel injector and the first intake opening or the second intake opening.

6. The injection device of claim 1 , wherein the second fuel injector and the third fuel injector include only a single injection orifice for injecting the fuel having the second fuel composition, and the second fuel injector and the third fuel injector are dimensioned for a lower fuel through-flow range than the at least one first fuel injector.

7. The injection device of claim 1 , wherein the first fuel composition comprises compressed natural gas.

8. An internal combustion engine, comprising:
an injection device, including:
a first injection system for injecting fuel having a first fuel composition based on natural gas; and
a second injection system for injecting fuel based on gasoline;
wherein the first injection system has one first fuel injector for injecting fuel having the first fuel composition in the direction of both a first intake opening of a combustion chamber of the internal combustion engine, and a second intake opening of the combustion chamber; and wherein the second injection system has a second fuel injector for injecting fuel having the second fuel composition essentially only in the direction of the first intake opening, and a separate third fuel injector for injecting fuel having the second fuel composition essentially only in the direction of the second intake opening.

9. The internal combustion engine of claim 8 , wherein the first fuel composition comprises compressed natural gas.

10. A method for injecting fuel in an internal combustion engine, the method comprising:
injecting, using a first injection system, fuel having a first fuel composition based on natural gas; and
injecting, using a second injection system, fuel having a second fuel composition based on gasoline;
wherein the first injection system has one first fuel injector for injecting fuel having the first fuel composition in the direction of both a first intake opening of a combustion chamber of the internal combustion engine, and a second intake opening of the combustion chamber; and
wherein the second injection system has a second fuel injector for injecting fuel having the second fuel composition essentially only in the direction of the first intake opening, and a separate third fuel injector for injecting fuel having the second fuel composition essentially only in the direction of the second intake opening.

11. The method of claim 10 , wherein the first fuel injector is used exclusively for injecting fuel having the first fuel composition, and the second fuel injector and the third fuel injector are used exclusively for injecting fuel having the second fuel composition.

12. The method of claim 10 , wherein predominantly fuel having the second composition is injected by the second fuel injector and the third fuel injector in a start-up phase of the internal combustion engine, and wherein in a load phase of the internal combustion engine, predominantly fuel having the first composition is injected by the first fuel injector.

13. The method of claim 10 , wherein the first fuel composition comprises compressed natural gas.

Assignees

• Gutscher Andreas
• Posselt Andreas
• Lorenz Marko
• Bosch Gmbh Robert

Inventors

• Gutscher Andreas
• Posselt Andreas
• Lorenz Marko

Classifications

• F02D19/081

  Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other · CPC title

• F02D19/0692 Primary

  Arrangement of multiple injectors per combustion chamber · CPC title

• F02M43/00 Primary

  Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive · CPC title

• Y02T10/36

  Cross-Sectional Technologies · mapped topic

• F02M69/044

  for injecting into the intake conduit downstream of an air throttle valve · CPC title