(19)
(11) EP 1 031 721 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.04.2003 Bulletin 2003/15

(43) Date of publication A2:
30.08.2000 Bulletin 2000/35

(21) Application number: 00102054.4

(22) Date of filing: 02.02.2000
(51) International Patent Classification (IPC)7: F02D 41/38, F02D 41/40
(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

(30) Priority: 24.02.1999 JP 4619799

(71) Applicant: Toyota Jidosha Kabushiki Kaisha
Aichi-ken 471-8572 (JP)

(72) Inventors:
  • Sugiyama, Tatsumasa c/o Toyota Jidosha K.K.
    Aichi-ken, 471-8571 (JP)
  • Katou, Yuuichirou c/o Toyota Jidosha K.K.
    Aichi-ken, 471-8571 (JP)

(74) Representative: Kuhnen & Wacker 
Patentanwaltsgesellschaft dbR Postfach 19 64
85319 Freising
85319 Freising (DE)

   


(54) Fuel pressure control device for high pressure fuel injection system


(57) In a fuel pressure control apparatus for a high-pressure fuel injection system provided with a common rail (15), a supply pump (13) for force-feeding fuel to the common rail, and a fuel injection valve (17) attached to each cylinder of a diesel engine (1) and connected at one end to the common rail (15), an attempt is made to securely reduce a surplus of fuel pressure making use of a limited period during which normal fuel injection is not carried out. In exclusively performing pressure-release of fuel in the common rail (15) by driving the fuel injection valve (17) within an invalid injection period, the fuel injection valve (17) is driven in a cycle that does not depend on an operational condition of the engine (1), while adjusting a timing for driving the fuel injection valve (17) in such a manner as to prevent interference with the normal fuel injection control.






Search report