Patent ID: 7210289
Filing Date: 2007-05-01
Classification: F02B,F02D,Y02T

Abstract:
1. An output control system for an engine of the type operating with timed spark ignition, in which, in an exhaust passage for guiding exhaust gas from the engine, at a location external to and downstream from the engine, there has been arranged an exhaust control valve for making an exhaust gas cross-sectional area thereof variable, the output control system comprising: diagnosis means for diagnosing whether or not said exhaust control valve is operating normally; and output limiting means for lowering the engine output when an operation of said exhaust control valve is diagnosed as abnormal, said output limiting means reduces a rate of fuel injections to the engine according to thinning out ratios responsive to the engine speed have-been, said thinning out ratios being set stepwise such that the engine output becomes lower than at all times of normal operation.