EP 0668966 A1 19950830 - METHOD OF DIAGNOSING MALFUNCTIONING OF THE HIGH-PRESSURE CIRCUIT OF INTERNAL COMBUSTION ENGINE HIGH-PRESSURE INJECTION SYSTEMS.
Title (en)
METHOD OF DIAGNOSING MALFUNCTIONING OF THE HIGH-PRESSURE CIRCUIT OF INTERNAL COMBUSTION ENGINE HIGH-PRESSURE INJECTION SYSTEMS.
Title (de)
VERFAHREN ZUR HERSTELLUNG VON STöRUNGEN DES HOCHDRUCKKREISES EINESHOCHDRUCK- KRAFTSTOFFEINSPRITZ EINER BRENNKRAFTMASCHINE.
Title (fr)
METHODE DE DIAGNOSTIC DE DEFAILLANCES D'UN CIRCUIT A HAUTE PRESSION D'UN SYSTEME D'INJECTION A HAUTE PRESSION D'UN MOTEUR A COMBUSTION INTERNE.
Publication
Application
Priority
- EP 9402922 W 19940902
- IT TO930646 A 19930903
Abstract (en)
[origin: WO9506814A1] A method of diagnosing malfunctioning of a high-pressure circuit including a pump (6) for supplying fuel at a pressure value controlled by a pressure regulating solenoid valve (7) supplied with current whose duty cycle is controlled in periodic control cycles. The method consists in monitoring quantities correlated to the pressure generated by the pump (6) in successive control cycles; comparing the pattern of the quantities with reference values; and generating fault signals in the event the determined pattern fails to present a predetermined relationship with the reference values. In particular, a check is made to determine whether fuel supply pressure remains above or below maximum and minimum values; wether the duty cycle of the current supply to the solenoid valve (7) remains above or below predetermined limits; and to determine the congruency of a measured pressure value and a reference value calculated on the basis of the duty cycle.
IPC 1-7
IPC 8 full level
F02D 41/22 (2006.01); F02D 41/38 (2006.01); F02M 65/00 (2006.01); F02D 45/00 (2006.01)
CPC (source: EP)
F02D 41/22 (2013.01); F02D 41/3836 (2013.01); F02D 41/3809 (2013.01); F02D 2041/2027 (2013.01); F02D 2041/223 (2013.01); F02D 2041/224 (2013.01); F02D 2041/225 (2013.01); F02D 2041/228 (2013.01); F02D 2200/0602 (2013.01); F02D 2250/31 (2013.01)
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
WO 9506814 A1 19950309; DE 69409222 D1 19980430; DE 69409222 T2 19980716; EP 0668966 A1 19950830; EP 0668966 B1 19980325; IT 1261575 B 19960523; IT TO930646 A0 19930903; IT TO930646 A1 19950303; JP 3727339 B2 20051214; JP H08503053 A 19960402
DOCDB simple family (application)
EP 9402922 W 19940902; DE 69409222 T 19940902; EP 94927543 A 19940902; IT TO930646 A 19930903; JP 50796095 A 19940902