Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1994-10-03
1995-10-24
Okonsky, David A.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123198F, F01L 1300
Patent
active
054601290
ABSTRACT:
A control system and control method are described for an engine (12) having a valve controller (42) for controlling exhaust valves (EV.sub.1-4) and intake valves (IV.sub.1-4) 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).
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James John V.
Miller John M.
Ford Motor Company
Lippa Allan J.
Lo Weilun
May Roger L.
Okonsky David A.
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