(19)
(11) EP 1 030 047 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.06.2005 Bulletin 2005/22

(43) Date of publication A2:
23.08.2000 Bulletin 2000/34

(21) Application number: 00100737.6

(22) Date of filing: 14.01.2000
(51) International Patent Classification (IPC)7: F02D 41/38
(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: 15.02.1999 JP 3546899
15.02.1999 JP 3547099

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

(72) Inventors:
  • Sugiyama, Tatsumasa
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • Katou, Yuuichirou
    Toyota-shi, Aichi-ken, 471-8571 (JP)

(74) Representative: KUHNEN & WACKER 
Patent- und Rechtsanwaltsbüro Postfach 19 64
85319 Freising
85319 Freising (DE)

   


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


(57) A fuel pressure control device and method for a high pressure fuel injection system serve to ensure good control and response characteristics irrespective of a transition state or a stationary state. Injectors (12) injecting a fuel into combustion chambers of cylinders (#1 to #4) of an engine (10) are connected to a common rail (20) and supplied with a high pressure fuel from the common rail (20). A fuel pump (30) pressurizes fuel in a fuel tank (14) to high pressure and force-feeds to the common rail (20). An ECU (60) sets closing timings of regulation valves (70a, 70b) of a fuel pump (30) based on predetermined control gains, thereby changing fuel force feed quantity and controlling fuel pressure within the common rail (20) to coincide with target fuel pressure. The ECU (60) variably sets the control gains based on the bulk modulus of the fuel calculated based on the pressure and temperature of the fuel within the common rail (20).






Search report