| 摘要 |
The present invention relates to verifying the cycle of a fuel injection internal combustion engine during running of the engine. The engine comprises a number of cylinders with pistons linked to a crankshaft, an exhaust conduit, one or more engine operating condition sensors including an exhaust gas sensor in an exhaust conduit, and an engine management system that includes timer means and fueling means for controlling the air/fuel ratio for at least one cylinder, the engine management system being arranged to receive from said sensors respective signals representative of engine operating conditions including exhaust gas condition, wherein the engine management system is capable of verifying the engine cycle by first altering the air/fuel ratio for one cylinder relative to the other cylinders, then timing a time delay until a signal is received from the exhaust gas sensor indicating a change in exhaust gas condition attributable to exhaust from said one cylinder and then comparing this delay against an expected delay according to the engine operating conditions.
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