Electronic fuel injection circuit with altitude compensation

Details Electronic fuel injection circuit with altitude compensation Electronic fuel injection circuit with altitude compensation

1986-12-23

1987-12-22

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123412, 123478, F02D 4134

Patent

active

047140674

ABSTRACT:
A resistance switching circuit is toggled immediately prior to cranking but subsequent to power application by the output of a manifold absolute pressure sensor effectively responding to ambient atmospheric pressure as indicative of altitude. The switching circuit is connected in series with the resistance element of the potentiometer which serves as the throttle control and alters the transfer characteristic of the control circuit. The gain of the system is such that the output operational amplifier saturates at an intermediate throttle setting such that the response for slow throttle is y=nx over the entire range of manifold pressure, while for fast throttle the response is y=nx for low manifold pressure and changes to y=mx+b for higher manifold pressure.

REFERENCES:
patent: 4271797 (1981-06-01), McCarbery
patent: 4280465 (1981-07-01), Staerzl
patent: 4349000 (1982-09-01), Staerzl
patent: 4526148 (1985-07-01), Narasaka et al.

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