Emission control system for an internal combustion engine
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United States of America Patent
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Jun 29, 1993
Grant Date -
N/A
app pub date -
Sep 18, 1992
filing date -
Sep 18, 1992
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system for controlling the air/fuel ratio input to a small engine measures the oxygen level in the engine's exhaust and compares it with a reference level. A stepper motor controls the air/fuel ratio and it is advanced one step each time a clock pulse is produced in a direction determined by the level of exhaust oxygen. A fault detector circuit stops the engine if the sensed oxygen level is outside a preset range for more than a preset time interval.
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