Method to reduce engine emissions due to misfire

A control system and control method are described for an engine (12) having a valve controller (42) for controlling exhaust valves (EV1-4) and intake valves (IV1-4) of each of the cylinders. Misfire detectors (210-302) provide an indication of ignition misfire in each of the cylinders each engine cy...

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Bibliographic Details
Main Authors MILLER; JOHN M, JAMES; JOHN V
Format Patent
LanguageEnglish
Published 24.10.1995
Edition6
Subjects
BLASTING
CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
ENGINE PLANTS IN GENERAL
HEATING
LIGHTING
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
STEAM ENGINES
WEAPONS
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Summary:A control system and control method are described for an engine (12) having a valve controller (42) for controlling exhaust valves (EV1-4) and intake valves (IV1-4) of each of the cylinders. Misfire detectors (210-302) provide an indication of ignition misfire in each of the cylinders each engine cycle. In response to a misfire detection, the valve lift of the exhaust valve for that cylinder is set to zero. If the misfire was absent during the cylinder's previous ignition cycle, the intake valve lift is also set to zero. After two successive misfire detections, the intake valve lift is set to a predetermined lift in order to refreshen the air/fuel charge which has been trapped in the cylinder from the previous engine cycles (402-428).
Bibliography:Application Number: US19940317010