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EP0068178A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Temperature control system

Assignee: Nissan Motor Co Ltd
•
Filing: 1982-06-04
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Granted: —
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Expires: 2002-06-04
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Abstract

Abstract A temperature control system is disclosed wherein a heater of a gas sensor and a plurality of reference resistors cooperate to form a bridge circuit. The temperature control system comprises a comparator means for monitoring a balancing voltage of the bridge circuit and generating a control signal indicative of the balancing voltage and an electric power amplifier means responsive to the control signal for varying a voltage applied to the bridge circuit in such a manner to reduce the balancing voltage. The gas sensor has mounted therein at least one of the plurality of reference resistors, which reference resistor having a resistance resulting from multiplying the resistance of the heater with a constant.

Inventors

  • 👤 Masaaki Uchida
  • 👤 Shigeo Isitani
  • 👤 Kohki Sone

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 17:01
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/2401

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 84 words
A temperature control system comprising: a gas sensor having a heater; a plurality of reference resistors which cooperate with said heater to form a bridge circuit; a source of electric power applying a voltage to said bridge circuit; means for monitoring a balancing voltage of said bridge circuit and generating a control signal indicative of said balancing voltage; and means responsive to .said control signal for varying said voltage applied to said bridge circuit in such a manner as to reduce said balancing voltage.
Claim 2
Dependent Claim 84 words
A temperature control system comprising: a gas sensor having a heater; a plurality of reference resistors which cooperate with said heater to form a bridge circuit; a source of electric power applying a voltage to said bridge circuit; means for monitoring a balancing voltage of said bridge circuit and generating a control signal indicative of said balancing voltage; and means responsive to .said control signal for varying said voltage applied to said bridge circuit in such a manner as to reduce said balancing voltage.
Claim 3
Dependent Claim 24 words
A temperature control system as claimed in claim 1, wherein said gas.sensor has mounted therein at least one of said plurality of reference resistors.
Claim 4
Dependent Claim 34 words
A temperature control system as claimed in claim 2, wherein said at least one of said plurality of reference resistors has a resistance resulting from multiplying a resistance of said heater with a constant.
Claim 5
Dependent Claim 15 words
A temperature control system as claimed in claim 3, wherein said constant is expressed by
Claim 6
Dependent Claim 47 words
A temperature control system as claimed in claim 2 or 3 or 4, wherein said gas sensor comprises an element holder, a gas concentration measuring element supported by said element holder, a connector carrying terminals electrically connected via respective lead lines with said gas concentration measuring element.

References Cited (Backward Citations)

FR1603599A Cited
FR2126039A5 Cited
FR2393363A1 Cited
EP0001512A1 Cited
GB2015175A Cited
EP0009129A1 Cited

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