Accumulation-type fuel injection system and accumulation chamber pressure control method therefor

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EP 1 024 274 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	27.03.2002 Bulletin 2002/13

(43)	Date of publication A2:
	02.08.2000 Bulletin 2000/31

(21)	Application number: 00100432.4

(22)	Date of filing: 10.01.2000

(51)	International Patent Classification (IPC)⁷: F02D 41/38, F02M 63/02

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

28.01.1999 JP 1992499
19.07.1999 JP 20447099

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

(72)	Inventors:
	Uchiyama, Ken, c/o Denso Corporation Kariya-city, Aichi-pref., 448-8661 (JP) Isogai, Nobumasa, c/o Denso Corporation Kariya-city, Aichi-pref., 448-8661 (JP) Haraguchi, Hiroshi, c/o Denso Corporation Kariya-city, Aichi-pref., 448-8661 (JP)

(74)	Representative: Pellmann, Hans-Bernd, Dipl.-Ing. et al
	Patentanwaltsbüro Tiedtke-Bühling-Kinne & Partner Bavariaring 4-6 80336 München 80336 München (DE)

(54)	Accumulation-type fuel injection system and accumulation chamber pressure control method therefor

(57) A spill control valve such as an electromagnetic valve (1a) of an injector (1) is ineffectively driven to open for a period (Tq) shorter than a delay period (tm) by which a nozzle needle (37) opens, when a pressure reducing condition to reduce fuel pressure in a common rail (3) is satisfied. A temperature of an injector driving circuit (79) in an ECU (7) is estimated from a coolant temperature detected by a coolant temperature sensor (71). A cycle period of an ineffective driving is determined from the estimated temperature so that a thermal load applied to the injector driving circuit does not exceed a limit.

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