Emission control system for an internal combustion engine

Details Emission control system for an internal combustion engine Emission control system for an internal combustion engine

1992-09-18

1993-06-29

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123399, 123688, F02D 910, F02D 4114

Patent

active

052224716

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.

REFERENCES:
patent: 4171690 (1979-10-01), Hosaka et al.
patent: 4178883 (1979-12-01), Herth
patent: 4204482 (1980-05-01), Harada et al.
patent: 4363305 (1982-12-01), Ohgami et al.
patent: 4364227 (1982-12-01), Yoshida et al.
patent: 4402291 (1983-09-01), Aono
patent: 4430979 (1984-02-01), Shikata
patent: 4601273 (1986-07-01), Kitahara et al.
patent: 5033433 (1991-07-01), Churchill et al.

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