초록 ▼

An injection system for a diesel engine with an injection pump for each cylinder has a delivery control valve 16 which is subjected to hydraulic control commands from a single central servohydraulic system, so that the respective spool 39 of the delivery control valve 16 connects the high pressure p

An injection system for a diesel engine with an injection pump for each cylinder has a delivery control valve 16 which is subjected to hydraulic control commands from a single central servohydraulic system, so that the respective spool 39 of the delivery control valve 16 connects the high pressure pump chamber 35 of the injection pump with its supply chamber 36. This bypassing connection occurs simultaneously in all the delivery control valves 16, however, movement of the delivery control spool 39 to a more fully open position takes place only if the associated injection pump is delivering fuel to the nozzle because the delivery pressure is used to complete the opening movement of the delivery control valve spool 39. In addition, a similarly operated pilot injection valve 60 is provided.

대표청구항 ▼

In a fuel injection system for a diesel engine of the type having an injection pump for each of a plurality of combustion cylinders, each pump having a housing containing a low pressure fuel supply chamber and a high pressure pump chamber in which fuel is subjected to a fuel injection pressure by a

In a fuel injection system for a diesel engine of the type having an injection pump for each of a plurality of combustion cylinders, each pump having a housing containing a low pressure fuel supply chamber and a high pressure pump chamber in which fuel is subjected to a fuel injection pressure by a reciprocating pump piston whereby fuel is delivered to an injection nozzle, the combination comprising: an arrangement for modifying the fuel delivery of each of said injection pumps including a delivery control valve in each pump including wall means defining a spool bore, an axially shiftable delivery control spool in sealing relation with said bore, the end surface of one end of said delivery control spool and said spool bore defining a low pressure chamber, a low pressure passage connecting said low pressure chamver in fluid communication with said fuel supply chamber, wall means defining a servopressure chamber at the other end of said delivery control spool, a high pressure passage in said pump connecting said high pressure pump chamber to said spool bore at a point spaced a first predetermined axial distance from the connection of said low pressure passage to said low pressure chamber, said delivery control spool being axially shiftable between a first fluid flow control position in which it closes said high pressure passage at said spool bore and a second fluid flow control position in which said high pressure passage is partially open at said piston bore whereby it is in fluid communication with said low pressure chamber, biasing means axially urging said delivery control spool to its second axial position, and a pressure fluid supply system independent of fuel supplied to said supply chamber operable to supply pressure fluid to said servopressure chamber including a solenoid valve having a first fluid flow control position in which a first level of pressure is effected in said servopressure chamber causing said delivery control spool to be in its first position and having a second fluid flow control position in which a second level of pressure is effected in said servopressure chamber permitting said biasing means to cause said delivery control spool to be in its second position of adjustment whereby actuation of said solenoid valve effects termination of fuel delivery of said pump.