Control of a partial cylinder deactivation engine
First Claim
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1. A method for managing transitions between operational states of an internal combustion engine having a plurality of working chambers, the method comprising:
- operating the engine in one of a first displacement and a second displacement, each displacement having an associated fixed set of active working chambers, wherein the number of active working chambers associated with the first displacement is different than the number of active working chambers associated with the second displacement and wherein the number of active working chambers associated with each of the first and second displacements is greater than zero;
making a transition between the first displacement and the second displacement; and
operating the engine in a skip fire manner during the transition wherein the transition between the first and second displacements has a duration of less than two seconds and wherein during skip fire operation at least one of the active working chambers is fired during a first working cycle, skipped during a subsequent second working cycle and fired during a third working cycle that is subsequent to the second working cycle, the first, second and third working cycles occurring during the transition.
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Abstract
A variety of methods and arrangements for managing transitions between operating states for an engine are described. In one aspect, an engine is operated in a particular operating state. A transition is made to another operating state. During that transition, the engine is operated in a skip fire manner.
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Citations
23 Claims
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1. A method for managing transitions between operational states of an internal combustion engine having a plurality of working chambers, the method comprising:
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operating the engine in one of a first displacement and a second displacement, each displacement having an associated fixed set of active working chambers, wherein the number of active working chambers associated with the first displacement is different than the number of active working chambers associated with the second displacement and wherein the number of active working chambers associated with each of the first and second displacements is greater than zero; making a transition between the first displacement and the second displacement; and operating the engine in a skip fire manner during the transition wherein the transition between the first and second displacements has a duration of less than two seconds and wherein during skip fire operation at least one of the active working chambers is fired during a first working cycle, skipped during a subsequent second working cycle and fired during a third working cycle that is subsequent to the second working cycle, the first, second and third working cycles occurring during the transition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 19, 22, 23)
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9. An engine controller for managing transitions between operational states of an internal combustion engine having a plurality of working chambers, the engine controller comprising:
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a fire control unit arranged to operate the engine in one of a first displacement and a second displacement, each displacement having an associated fixed set of active working chambers wherein the number of active working chambers associated with the first displacement is different than the number of active working chambers associated with the second displacement and wherein the number of active working chambers associated with each of the first and second displacements is greater than zero; and a firing timing determination module arranged to generate a firing sequence that operates at least one or more of the working chambers of the engine in a skip fire manner during a transition between the first and second displacements wherein the transition between the first and second displacements has a duration of less than five seconds and wherein during skip fire operation at least one of the active working chambers is fired during a first working cycle, skipped during a subsequent second working cycle and fired during a third working cycle that is subsequent to the second working cycle, the first, second and third working cycles occurring during the transition. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 20)
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17. A method for managing transitions between operational states of an internal combustion engine having a plurality of working chambers, the method comprising:
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operating the engine in one of a first displacement and a different, second displacement, each displacement having an associated fixed set of active working chambers wherein the number of active working chambers associated with the first displacement is different than the number of active working chambers associated with the second displacement and wherein the number of active working chambers associated with each of the first and second displacements is greater than zero; making a transition between the first displacement and the second displacement; during the transition, selecting a firing parameter from the group consisting of a plurality of predetermined firing fractions stored in a firing fraction library and a plurality of firing sequences stored in a firing sequence library; and operating the engine in a skip fire manner during the transition to deliver the selected firing parameter wherein during skip fire operation at least one of the active working chambers is fired during a first working cycle, skipped during a subsequent second working cycle and fired during a third working cycle that is subsequent to the second working cycle, the first, second and third working cycles occurring during the transition. - View Dependent Claims (18, 21)
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Specification