Method for operating an internal combustion engine having a plurality of cylinder banks

• US 20060005811A1
• Filed: 06/23/2005
• Published: 01/12/2006
• Est. Priority Date: 07/08/2004
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Hartmann, Dirk
• Granted Patent: US 7,246,594 B2
• Time in Patent Office: Days
• US Class Current: 123/406.470
• CPC Class Codes: F02D 17/02 Cutting-out cutting-out engines in multiple engine arrangements F02D25/04
• CPC Class Codes: F02D 2041/0012 with selective deactivation of cylinders
• CPC Class Codes: F02D 2250/21 during a transition between engine operation modes or states
• CPC Class Codes: F02D 37/02 one of the functions being ignition
• CPC Class Codes: F02D 41/0002 Controlling intake air
• CPC Class Codes: F02D 41/0082 per groups or banks F02D41/0087 takes precedence
• CPC Class Codes: F02D 41/0087 Selective cylinder activation, i.e. partial cylinder operation deceleration cut-off F02D41/123
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method for operating an internal combustion engine having a plurality of cylinder banks provides a cylinder cut-off using at least a reduced ignition angle retardation shift. In this context, at least one first cylinder bank is configured such that it is at least partially able to be cut off. Immediately before a cut off or immediately after a reactivation of at least one cylinder of the at least one first cylinder bank, a first output variable is set for the at least one first cylinder bank and a second output variable is set for at least one second cylinder bank. The first output variable and the second output variable are set differently from each other in such a way that an average of the first and second output variables is equivalent to a predetermined output variable of the internal combustion engine.

Claims

1. A method for operating an internal combustion engine having at least a first cylinder bank and a second cylinder bank, wherein at least one cylinder of the first cylinder bank is configured to be at least one of selectively cut off and subsequently reactivated, the method comprising:

setting, one of immediately before a cut off and immediately after a reactivation of the at least one cylinder of the first cylinder bank, a first output variable for the first cylinder bank and a second output variable for the second cylinder bank;

wherein the first output variable and the second output variable are set to be different from each other such that an average of the first output variable and the second output variable is equivalent to a predetermined output variable of the internal combustion engine.

2. The method as recited in claim 1, further comprising:

influencing an air supply to the first cylinder bank by at least one first actuator; and

influencing an air supply to the second cylinder bank by at least one second actuator.

3. The method as recited in claim 2, wherein the at least one cylinder of the first cylinder bank is cut off only when a predetermined value of the second output variable has been reached because of the influencing of the air supply to the second cylinder bank using the at least one second actuator.

4. The method as recited in claim 3, wherein the setting of the second output variable includes influencing of an ignition angle.

5. The method as recited in claim 4, wherein the influencing of the ignition angle is revoked during the cut off of the at least one cylinder of the first cylinder bank.

6. The method as recited in claim 4, wherein the influencing of the ignition angle is initiated during the reactivation of the at least one cylinder of the first cylinder bank.

7. The method as recited in claim 3, wherein an absolute value of the first output variable is limited to a predetermined threshold value floor.

8. The method as recited in claim 7, wherein the predetermined threshold value is selected as a function of a combustion limit of the first cylinder bank.

9. The method as recited in claim 3, wherein one of immediately before the cut off and immediately after the reactivation of the at least one cylinder of the first cylinder bank, an absolute value of a change in the first output variable is limited by a change in the second output variable.

10. The method as recited in claim 3, further comprising:

predetermining a third output variable for the second cylinder bank, wherein the third output variable is predetermined in such a way that the predetermined output variable of the internal combustion engine is achieved one of after the cut off and before the reactivation of the at least one cylinder of the first cylinder bank.

11. The method as recited in claim 10, wherein the third output variable is realized, one of after the cut off and before the reactivation of the at least one cylinder of the first cylinder bank, only by the influencing of the air supply using the at least one second actuator.

12. The method as recited in one of claim 2, wherein the first output variable is set by the influencing of the air supply using the at least one first actuator in such a way that an increase in the second output variable is compensated for with respect to the predetermined output variable of the internal combustion engine.

13. The method as recited in one of claim 3, wherein the first output variable is set by the influencing of the air supply using the at least one first actuator in such a way that an increase in the second output variable is compensated for with respect to the predetermined output variable of the internal combustion engine.

14. The method as recited in claim 3, wherein the at least one first actuator and the at least one second actuator are set so as to take up positions that are different from each other.