Deceleration lean out feature for electronic fuel management sys

Details Deceleration lean out feature for electronic fuel management sys Deceleration lean out feature for electronic fuel management sys

1978-06-22

1980-07-22

Smith, Jerry

Boots, shoes, and leggings

60278, 123480, 123493, G06F 1546, F02M 700, F02M 5100

Patent

active

042143071

ABSTRACT:
An electronic control unit for regulating the air/fuel ratio of an internal combustion engine is disclosed. The electronic control unit has an open loop calibration for regulating the air/fuel ratio that is corrected with a closed loop correction signal developed by an integral controller. The open loop calibration is a speed-density based schedule which is combined with corrections for special conditions to account for the operating parameters of the engine at any instant. Included in these special condition corrections are provisions for increasing the air/fuel ratio upon a deceleration sufficient enough to cause a rich air/fuel ratio breakthrough because of the EGR valve lag time. A deceleration detector senses decelerations in excess of this predetermined amount by measuring the rate of change of the pressure in the intake manifold of the engine. A fixed percentage increase in air/fuel ratio is switched into the open loop calibration when the deceleration exceeds the amount required for breakthrough. The feature is additionally inhibited at low engine speeds and when the EGR valve is not operational.

REFERENCES:
patent: 3731659 (1973-05-01), Barr et al.
patent: 3809028 (1974-05-01), Luchaco
patent: 3866584 (1975-02-01), Bigalke et al.
patent: 3969614 (1976-07-01), Moyer et al.
patent: 4089313 (1978-05-01), Asano et al.

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