Variable reference mixture control with current supplied exhaust

Details Variable reference mixture control with current supplied exhaust Variable reference mixture control with current supplied exhaust

1979-03-29

1980-12-09

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, F02D 304

Patent

active

042378290

ABSTRACT:
Mixture ratio control for internal combustion engines supplies a constant current into an exhaust gas sensor to develop a voltage of a substantial magnitude in proportion to the initial high value of the gas sensor internal impedance during low temperature conditions. The voltage so developed decreases as a function of time corresponding to the decrease of the internal impedance with temperature. A voltage detector is provided to trigger the control system to operate in a closed loop mode when the gas sensor voltage is reduced to a level below a first threshold level. Responsive to the output of the voltage detector the supplied current is momentarily interrupted to allow the gas sensor voltage to drop rapidly to a level which is higher or lower than a second threshold level depending on the concentration of the sensed gas in the exhaust system. A second detector senses this voltage drop relative to the second threshold to determine whether the gas sensor output represents rich or lean condition. The reference point of the closed loop is raised or lowered in response to the output of the second detector and further decreased as a function of time such that the reference point lies within the range between maximum and minimum peak values of the gas sensor output signal.

REFERENCES:
patent: 4153023 (1979-05-01), Asano et al.
patent: 4156413 (1979-05-01), Taplin
patent: 4167925 (1979-09-01), Hosaka et al.
patent: 4169440 (1979-10-01), Taplin et al.

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