Auxiliary fuel injection control circuit

Details Auxiliary fuel injection control circuit Auxiliary fuel injection control circuit

1977-10-17

1979-11-20

Brigance, Gerald

Internal-combustion engines

Noncompression

123 32EL, F02D 300, F02M 700

Patent

active

041746821

ABSTRACT:
An electronic circuit is described for use with an existing fuel injection system in which fuel control pulses are generated on the basis of air flow rate, engine speed and exhaust gas composition. In particular, the existing fuel injection system is assumed to include an exhaust gas sensor with a signal integrator and a throttle position switch which indicates a closed throttle. It is also assumed that the fuel injection system shuts off fuel control pulses when the throttle is closed and engine speed drops below a predetermined value. The present circuit is intended to recognize this fuel shutoff and to set the integrator at an average value irrespective of the "too lean" signal which it receives from the exhaust gas sensor. In this way, upon termination of fuel shutoff, the engine will receive an average mixture rather than a highly enriched one.

REFERENCES:
patent: 3742920 (1973-07-01), Black
patent: 3866584 (1975-02-01), Bigalke et al.
patent: 3916170 (1975-10-01), Norimatsu et al.
patent: 4073269 (1978-02-01), Herth et al.
patent: 4089313 (1978-05-01), Asano et al.

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