EP 0174261 B1 19890111 - FUEL DELIVERY CONTROL SYSTEM
Title (en)
FUEL DELIVERY CONTROL SYSTEM
Publication
Application
Priority
US 64064084 A 19840814
Abstract (en)
[origin: EP0174261A1] A system for controlling delivery of fuel to a compression ignition engine having a predetermined characteristic ignition delay. A positive-displacement pump, typically a high-pressure, multiplunger in-line pump (12), receives fuel from a source and provides intermittent, pressurized pulses of fuel flow. A conduit (30) extends from a pumping chamber (62) to a node to which a normally-closed fuel injector (32) is operatively connected. A normally-open, solenoid-controlled bypass valve (34) has an inlet port (36) connected to the conduit node for allowing fuel to bypass the injector (32). When a signal is applied to the bypass valve (34) it rapidly closes, causing the pressure at the injector (32) to rapidly increase to a first injector-opening level to inject pilot fuel. Thereafter, following a predetermined hydraulic delay, the pressure at the injector (32) rapidly increases to a second level greater than the first to provide main fuel injection. The conduit length determines the hydraulic delay and is selected to have a predetermined time relation with the engine's ignition delay time. The hydraulic delay substantially corresponds with the ignition delay time in the preferred embodiment. The bypass valve (34) also responds rapidly in the closing direction. Part of the make-up fuel delivered by the pump (12) is provided by reverse flow of fuel through the open bypass valve (34).
IPC 1-7
IPC 8 full level
F02D 1/02 (2006.01); F02M 45/04 (2006.01); F02M 51/00 (2006.01); F02M 55/02 (2006.01); F02M 59/36 (2006.01); F02M 63/06 (2006.01)
CPC (source: EP)
F02M 45/04 (2013.01); F02M 55/02 (2013.01); F02M 59/366 (2013.01); F02M 63/06 (2013.01)
Citation (examination)
- US 3851635 A 19741203 - MERCIER L, et al
- US 4258674 A 19810331 - WOLFF GEORGE D
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0174261 A1 19860312; EP 0174261 B1 19890111; DE 3567506 D1 19890216; JP S61106970 A 19860524
DOCDB simple family (application)
EP 85630105 A 19850705; DE 3567506 T 19850705; JP 16738085 A 19850729