Patent US4471648A successfully refreshed from Google Patents.
US4471648A
Expired / Lapsed
US
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Temperature control system
Assignee: Nissan Motor Co Ltd
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Filing: 1982-06-08
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Granted: 1984-09-18
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Expires: 2002-06-08
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
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:10
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: 5
Claim 1
Independent Claim
91 words
An apparatus comprising: a gas sensor having a heater; a bridge circuit comprising a plurality of reference resistors, at least one of said plurality of reference resistors being mounted within said gas sensor; 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
Independent Claim
91 words
An apparatus comprising: a gas sensor having a heater; a bridge circuit comprising a plurality of reference resistors, at least one of said plurality of reference resistors being mounted within said gas sensor; 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
32 words
An apparatus as claimed in claim 1, 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 4
Dependent Claim
18 words
An apparatus as claimed in claim 2, wherein said constant is expressed by K=C·(R 1 /R 3 ).
Claim 5
Dependent Claim
45 words
An apparatus as claimed in claim 2, 3, or 1, wherein said gas sensor comprises an element holder, a gas concentration measuring element supported by said element holder, and 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
US4359030A
Cited
US4365604A
Cited
US4332225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |