Method and apparatus for maintaining temperatures during engine fuel cutoff modes
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United States of America Patent
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-
Jan 16, 1996
Grant Date -
N/A
app pub date -
Oct 25, 1993
filing date -
Oct 25, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method, for use with a vehicle including a multi-cylinder internal combustion engine having exhaust valves, for controlling the temperature of the exhaust valves during fuel cutoff modes of engine operation utilizing a bit pattern representation of the engine cylinders. The method includes cutting off the fuel delivered to the cylinders in an indexed cylinder firing pattern to vary which cylinders receive fuel, so as to maintain acceptable exhaust valve temperature levels. The method may also include operating the engine with a lean air/fuel ratio, so as to maintain acceptable catalytic converter temperature levels.
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