Patent ID: 7562561
Filing Date: 2009-07-21
Classification: F02D,F02M,Y02T

Abstract:
1. An intake manifold air leak determination system for an internal combustion engine, comprising: an intake manifold fluidly connected to a plurality of cylinders of the engine; a plurality of fuel injection valves for injecting fuel for the cylinders, each of said plurality of fuel injection valves corresponding to a respective one of said plurality of cylinders; a fuel cutoff indicating module indicating that fuel has been cut from one or more of said plurality of cylinders but less than all of said plurality of cylinders due to certain operating conditions of the internal combustion engine; an air leak detection module determining whether a significant air leak is occurring at said intake manifold; an air leak fuel cutoff module cutting off fuel supply to all of said fuel injection valves when said air leak detection module determines that a significant air leak is occurring at said intake manifold; and an air leak detection prohibiting module prohibiting detection of an air leak at said intake manifold by said air leak detection module when said fuel cutoff indicating module indicates that fuel has been cut from said one or more of said plurality of cylinders.