Patent ID: 8839766
Filing Date: 2014-09-23
Classification: F02D

Abstract:
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.