Air fuel ratio measuring system

Details Air fuel ratio measuring system Air fuel ratio measuring system

1987-08-11

1989-01-17

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Using ionization effects

For analysis of gas, vapor, or particles of matter

324464, 204406, G01N 2762, G01N 2766

Patent

active

047990180

ABSTRACT:
A detecting element (6) comprising a solid zirconia electrolyte (6a), a reference electrode (6d), a detecting electrode (6c) and a diffusion member (6a) is provided, and also a driving circuit (1b, 4) for impressing a voltage between the electrodes (6c, 6d) of said detecting element so as to detect the threshold current of an oxygen ion pumping current (I.sub.p) is provided. The output of this driving circuit is delivered as a continuous output (V.sub.o) of an air fuel ratio of fuel gas comprising al the regions of rich, stoichiometric and lean air fuel ratios. On the other hand, an I.sub.p detection resistor (Rs) for detecting the pumping current flowing between the input/output terminals of the driving circuit is provided. The opposite-end voltages (V.sub.a, V.sub.o) of this I.sub.p detection resistor are compared by a comparator (5), and a step signal corresponding to the stiochiometric air fuel ratio (.lambda.) is outputted from this comparator.

REFERENCES:
patent: 4578171 (1986-03-01), Yamada et al.
patent: 4626338 (1986-12-01), Kondo et al.
patent: 4664773 (1987-03-01), Suzuki et al.

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