Fuel injection control apparatus having fail-safe function for protection against occurence of short-circuit to ground at connecting lead of fuel injector coil

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(11)

EP 1 788 228 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	13.08.2008 Bulletin 2008/33

(43)	Date of publication A2:
	23.05.2007 Bulletin 2007/21

(21)	Application number: 06024219.5

(22)	Date of filing: 22.11.2006

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International Patent Classification (IPC):

F02D 41/20^(2006.01)
F02D 41/14^(2006.01)

F02D 41/22^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK RS

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Priority:

22.11.2005 JP 2005337152
04.10.2006 JP 2006273247

(71)	Applicant: Denso Corporation
	Kariya-city, Aichi-pref. 448-8661 (JP)

(72)	Inventor:
	Kamiya, Takamichi Kariya-city Aichi-pref., 448-8661 (JP)

(74)	Representative: Winter, Brandl, Fürniss, Hübner Röss, Kaiser, Polte Partnerschaft Patent- und Rechtsanwaltskanzlei
	Alois-Steinecker-Strasse 22 85354 Freising 85354 Freising (DE)

(54)	Fuel injection control apparatus having fail-safe function for protection against occurence of short-circuit to ground at connecting lead of fuel injector coil

(57) A fuel injection control apparatus monitors the amplitude of a discharge current pulse supplied from a capacitor to a currently selected one of a group of fuel injectors, and judges that a short-circuit to ground is occurring in a connection lead of the group if the amplitude exceeds a regular threshold value. If that occurs, the judgement threshold value is changed to a lower value during a succeeding fixed number of judgement operations. If the regular threshold value is exceeded for a predetermined number of times in succession, operations for driving the injectors of that group are terminated.

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