Patent ID: 8100117
Filing Date: 2012-01-24
Classification: F01L,F01N,F02B,F02D,F02P,Y02T

Abstract:
1. An engine operating method, comprising: combusting an air-fuel mixture in each cylinder of a four cylinder engine; routing exhaust gases of each cylinder through a single exhaust manifold; deactivating solely one exhaust valve of each cylinder of the engine during a first engine operating condition, the deactivated solely one exhaust valve of each cylinder deactivated for at least two engine cycles, where an exhaust valve at a first location of a first cylinder is deactivated during the first engine operating condition, where an exhaust valve at a second location of a second cylinder is deactivated during the first engine operating condition, and where the first location is different from the second location; and activating the solely one exhaust valve of each cylinder during a second engine operating condition.