(19)
(11) EP 3 096 000 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.12.2016 Bulletin 2016/51

(43) Date of publication A2:
23.11.2016 Bulletin 2016/47

(21) Application number: 16164940.5

(22) Date of filing: 12.04.2016
(51) International Patent Classification (IPC): 
F02P 19/02(2006.01)
 F23Q 7/00(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA MD

(30) Priority: 18.05.2015 JP 2015100775

(71) Applicant: NGK Spark Plug Co., Ltd.
Nagoya-shi, Aichi 467-8525 (JP)

(72) Inventors:
  • KAN, Yohei
    Nagoya-shi, Aichi 467-8525 (JP)
  • OTSUBO, Masanori
    Nagoya-shi, Aichi 467-8525 (JP)

(74) Representative: Nicholls, Michael John 
J A Kemp 14 South Square Gray's Inn
London WC1R 5JJ
London WC1R 5JJ (GB)

   


(54) HEATING DEVICE, HEATER STATE ESTIMATING DEVICE, AND HEATER STATE ESTIMATING METHOD


(57) To improve accuracy of detecting the state of a heater, such as abnormality of a heating unit, wear of a base, and the like.
A heating device includes: a heater including an electric conductor, a heating unit that generates heat by energization, and a ceramic base that holds the electric conductor and the heating unit so that the electric conductor and the heating unit are buried in the ceramic base so as to be isolated from each other; and an energization unit that causes the heater to generate heat by energizing the heating unit. The heating device includes: a detection unit that detects an electric resistance of the base between the electric conductor and the heating unit; and an estimation unit that estimates a state of the heater on the basis of the electric resistance detected by the detection unit when the heating unit is energized under a predetermined condition.







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