Altitude compensation feature for electronic fuel management sys

Details Altitude compensation feature for electronic fuel management sys Altitude compensation feature for electronic fuel management sys

1978-06-22

1980-07-08

Smith, Jerry

Boots, shoes, and leggings

123478, 123480, 123486, 123488, F02M 700, G06F 1546

Patent

active

042120659

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 an altitude compensation feature. The altitude compensation feature includes circuitry to modify the intake manifold pressure portion of the speed density schedule with two variables which depend on altitude. Power enrichment for the pressure schedule is provided as a function of altitude by lowering a power enrichment break point for increases in altitude and enrichment for all values of intake pressure is provided as a function of altitude to compensate for the internal EGR of the engine and to provide increased utilization for the closed loop controller.

REFERENCES:
patent: 3969614 (1976-07-01), Moyer et al.
patent: 4009699 (1977-03-01), Hetzler et al.
patent: 4050878 (1977-09-01), Priegel
patent: 4114570 (1978-09-01), Marchak et al.

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