| 摘要 |
A method of, and controller for, detecting unstable combustion (mis-fire) in an internal combustion engine (e.g. in a vehicle). The method comprises the steps of measuring an exhaust gas parameter (e.g. amount of nitrous oxide or oxygen in the exhaust gas), and detecting unstable combustion by comparing the measured exhaust gas parameter with an expected exhaust gas parameter value. Unstable combustion may be detected if the difference between the measured parameter and the expected value is greater than a threshold amount. The expected value may be determined using a map, with an input to the map comprising a start of ignition (SOI) retardation degree angle of the engine, and optionally at least one of a measured air temperature and a measured air pressure. |
