Air-fuel ratio detecting system

Details Air-fuel ratio detecting system Air-fuel ratio detecting system

1979-03-08

1980-12-09

Myhre, Charles J.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, F02D 500, F02B 308

Patent

active

042378397

ABSTRACT:
An air-fuel ratio sensor exhibiting a resistance value variable depending on the concentration of oxygen in exhaust gases is disposed in the exhaust system of an internal combustion engine and is connected in series with a variable resistance unit. Strobe signals are produced when the potential level at the connection point between the air-fuel ratio sensor and the variable resistance unit crosses a reference potential level. A maximum value and a minimum value of the potential at this connection point are sampled and held in a sampling circuit to be applied to a computation circuit in response to the strobe signals. The computation circuit computes the aforementioned reference voltage on the basis of the detected maximum and minimum values of the potential at the connection point. The reference potential and the resistance value of the variable resistance unit vary in relation to the maximum and minimum potential values sampled and held in the sampling circuit.

REFERENCES:
patent: 4140085 (1979-02-01), Rabas et al.
patent: 4156413 (1979-05-01), Taplin

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