Air-fuel ratio control device for an internal combustion engine
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United States of America Patent
Stats
-
May 29, 1990
Grant Date -
N/A
app pub date -
Mar 27, 1989
filing date -
Apr 19, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An air-to-fuel ratio control device for an internal combustion engine is disclosed, which comprises a pressure sensor for detecting the pressure P within a cylinder of the engine, and means for computing an actual value of the ratio (dP/d.theta.)max/Pmax, wherein (dP/d.theta.)max is the maximum rate of change in pressure P within the cylinder with respect to the crank angle .theta. and Pmax is the maximum pressure in the cylinder during a predetermined interval in a cycle of the cylinder. A target value of the ratio (dP/d.theta.)max/Pmax is obtained by converting the optimum air-to-fuel ratio corresponding to the operating condition of the engine, the conversion being effected by means of a relationship established between the values of the air-to-fuel ratio and those of the ratio (dP/d.theta.)max/Pmax. A control element controls the amount of injected fuel to reduce the deviation of the actual value of the ratio (dP/d.theta.)max/Pmax with respect to the target value thereof.
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