(19)
(11) EP 2 290 224 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.10.2015 Bulletin 2015/43

(43) Date of publication A2:
02.03.2011 Bulletin 2011/09

(21) Application number: 10251466.8

(22) Date of filing: 19.08.2010
(51) International Patent Classification (IPC): 
F02P 19/02(2006.01)
 F02P 17/00(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 SE SI SK SM TR
Designated Extension States:
BA ME RS

(30) Priority: 20.08.2009 JP 2009191294

(71) Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Toyota-shi, Aichi-ken, 471-8571 (JP)

(72) Inventors:
  • Morita, Hisaharu
    Kariya-City Aichi-Pref. 448-8661 (JP)
  • Mizutani, Koichi
    Toyota-shi Aichi-ken 471-8571 (JP)
  • Miyara, Naoyuki
    Toyota-shi Aichi-ken 471-8571 (JP)

(74) Representative: Smith, Samuel Leonard 
J A Kemp 14 South Square
Gray's Inn London WC1R 5JJ
Gray's Inn London WC1R 5JJ (GB)

   


(54) Glow plug deterioration determination system


(57) A glow plug deterioration determination system 1 includes: a glow plug 40; a GCU 30 that controls energization of the glow plug 40 from a power supply 10 by driving switch means T1 to T4 to open and close in accordance with a drive signal SI issued by an ECU 20; a self-diagnosis unit (DIU) 32 that detects an abnormality between the glow plug 40, the switch means T1 to T4, and the GCU 30 and transmits a self-diagnosis signal DI to the ECU 20; and current detecting means S1 to S4 for detecting a plug current IGL flowing through the glow plug 40, wherein the DIU 32 includes deterioration level determining means 330 for determining whether the glow plug 40 is in a deteriorated condition by comparing a plug current converted voltage Vi that is proportionate to the plug current IGL with a plurality of voltage thresholds Vref1 to Veefn.







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