DE602005004000D1 - Improvements in and relating to break detectors for electrically heatable disks - Google Patents

Improvements in and relating to break detectors for electrically heatable disks

Info

Publication number
DE602005004000D1
DE602005004000D1 DE602005004000T DE602005004000T DE602005004000D1 DE 602005004000 D1 DE602005004000 D1 DE 602005004000D1 DE 602005004000 T DE602005004000 T DE 602005004000T DE 602005004000 T DE602005004000 T DE 602005004000T DE 602005004000 D1 DE602005004000 D1 DE 602005004000D1
Authority
DE
Germany
Prior art keywords
resistance
disks
relating
threshold
electrically heatable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
DE602005004000T
Other languages
German (de)
Other versions
DE602005004000T2 (en
Inventor
Jonathan Barclay Dixon
Stephen Roland Day
Robert William Evans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pilkington Group Ltd
Original Assignee
Pilkington Group Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pilkington Group Ltd filed Critical Pilkington Group Ltd
Publication of DE602005004000D1 publication Critical patent/DE602005004000D1/en
Application granted granted Critical
Publication of DE602005004000T2 publication Critical patent/DE602005004000T2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
    • H05B3/86—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields the heating conductors being embedded in the transparent or reflecting material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications
    • H05B1/0236—Industrial applications for vehicles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/013—Heaters using resistive films or coatings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/035—Electrical circuits used in resistive heating apparatus
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2214/00—Aspects relating to resistive heating, induction heating and heating using microwaves, covered by groups H05B3/00, H05B6/00
    • H05B2214/02—Heaters specially designed for de-icing or protection against icing

Abstract

There is disclosed a crack detector (30) for a glazing (2) comprising a heatable layer (8), the detector (30) comprising a resistance measurer (32) arranged to repeatedly measure a resistance of the heatable layer (8) of the glazing (2) and to output a resistance value; a threshold determiner (38) arranged repeatedly to determine a threshold resistance indicative of a resistance of the heatable layer (8) characteristic of a crack, which threshold resistance is determined based on a plurality of the previous resistance values; and a comparator (40) arranged to compare the threshold resistance with the measured resistance value, thereby to determine if a crack is present.
DE602005004000T 2004-10-16 2005-10-13 Improvements in and relating to break detectors for electrically heatable disks Active DE602005004000T2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0423033.0A GB0423033D0 (en) 2004-10-16 2004-10-16 Improvements in and relating to crack detectors
GB0423033 2004-10-16

Publications (2)

Publication Number Publication Date
DE602005004000D1 true DE602005004000D1 (en) 2008-02-07
DE602005004000T2 DE602005004000T2 (en) 2008-12-18

Family

ID=33462861

Family Applications (1)

Application Number Title Priority Date Filing Date
DE602005004000T Active DE602005004000T2 (en) 2004-10-16 2005-10-13 Improvements in and relating to break detectors for electrically heatable disks

Country Status (4)

Country Link
EP (1) EP1648200B1 (en)
AT (1) ATE382251T1 (en)
DE (1) DE602005004000T2 (en)
GB (1) GB0423033D0 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201309549D0 (en) 2013-05-29 2013-07-10 Pilkington Group Ltd Glazing
US10755123B1 (en) * 2017-05-16 2020-08-25 Apple Inc. Window defect sensing and image processing
GB2569120B (en) * 2017-12-05 2021-02-10 Edwards Ltd Thermal management method and apparatus
US11229091B2 (en) * 2018-05-30 2022-01-18 Betterfrost Technologies, Inc. Continuous resistance and proximity checking for high power deicing and defogging systems
CN112997581B (en) * 2018-09-05 2024-03-22 Ppg工业俄亥俄公司 System and method for monitoring resistance of conductive coating as an indication of condition of conductive coating
DE102018218621A1 (en) * 2018-10-31 2020-04-30 Audi Ag Emergency control for a vehicle
US11780594B2 (en) 2019-10-02 2023-10-10 Ppg Industries Ohio, Inc. Transparency including a wireless sensor
CN113715768B (en) * 2020-05-25 2023-02-03 华晨宝马汽车有限公司 Protection system for avoiding injury of passenger when vehicle glass is broken and vehicle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565919A (en) * 1984-06-14 1986-01-21 Donnelly Corporation Crack detector for electrically conductive windshield
US5072098A (en) * 1990-06-11 1991-12-10 Chrysler Corporation Electrically heated windshield controller
US6020576A (en) * 1997-10-09 2000-02-01 Lear Automotive Dear Born, Inc. Temperature and windshield crack detector
US5981907A (en) * 1997-10-09 1999-11-09 Ut Automotive Dearborn, Inc. Rear wiper monitoring theft deterrent circuit
DE10125639C2 (en) * 2001-05-25 2003-12-24 Audi Ag Method for operating a window heater in a vehicle and window heater control unit

Also Published As

Publication number Publication date
GB0423033D0 (en) 2004-11-17
EP1648200B1 (en) 2007-12-26
ATE382251T1 (en) 2008-01-15
EP1648200A1 (en) 2006-04-19
DE602005004000T2 (en) 2008-12-18

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