Planar air-to fuel ratio sensor and driving circuit therefor

Details Planar air-to fuel ratio sensor and driving circuit therefor Planar air-to fuel ratio sensor and driving circuit therefor

1996-10-29

1998-02-24

Gorgos, Kathryn L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204412, 204425, 204426, 204429, G01N 27407

Patent

active

057208638

ABSTRACT:
A planar air-to-fuel (A/F) ratio sensor and a driving circuit therefor are provided. A circuit for driving a planar A/F ratio sensor having a structure wherein an exhaust gas side electrode is shared by a pumping cell and a sensing sell, or a structure wherein an air side electrode is shared by the pumping cell and the sensing cell, is comprised of a comparator for comparing a voltage measured in the sensing cell with a predetermined reference voltage corresponding to the voltage the sensing cell when the pumping cell is within a limit current range to output a voltage which is proportional to the difference between two compared voltages, an integrator for integrating the output of the voltage comparator to output a voltage, an adder for adding a voltage for compensating an electromotive force of the pumping cell to the output voltage of the integrator and an A/F ratio detector for sensing the current flowing through the pumping cell from a voltage output from the adder and applied to the pumping cell to detect an A/F ratio. Therefore, damage to the electrode can be prevented, and the response characteristic between the sensing cell and pumping cell and the accuracy in measuring the A/F ratio can be improved. Also, shift of the current limit region into a region where a voltage V.sub.p is greater than 0 can be compensated by an internal electromotive force of the pumping cell.

REFERENCES:
patent: 4658790 (1987-04-01), Kitahara
patent: 4661234 (1987-04-01), Takahashi et al.
patent: 4664773 (1987-05-01), Suzuki et al.
patent: 4718999 (1988-01-01), Suzuki et al.
patent: 4776943 (1988-10-01), Kitahara
patent: 5366610 (1994-11-01), Hirako et al.

Affiliated with

Also associated with

Rating

Planar air-to fuel ratio sensor and driving circuit therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Planar air-to fuel ratio sensor and driving circuit therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Planar air-to fuel ratio sensor and driving circuit therefor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1872929