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US 4,217,862 AGranted
High constant pressure, electronically controlled diesel fuel injection system
AssigneeCombustion Research & Technology, Inc.
InventorsLeonard N. Fort, Albert F. Albert, Edward P. Darragh
Life of this patent
Estimating the term…
Abstract
Diesel fuel injection system in which a standing high-pressure wave is maintained in the common rail and which utilizes injectors which function as gates or valves. Electronic controls sensitive to engine demands based on speed and load electronically control the injectors to vary both moment and duration of fuel injection time. Input signals, as determined by engine speed by way of the distributor, vary the injection timing according to an advance curve at the distributor correlated to piston position. Duration of the injection cycle (quantity of fuel injected) is controlled electronically and variably in relation to throttle position.
Claims29
Fuel injector mechanism for diesel engines, comprising:
- (a) an elongated generally cylindrical injector body member having an upper end and a lower end and an internal plunger bore, said body also being provided with fuel line connection means and first fuel passage means opening into and for admitting fuel under pressure to said bore, said injector body also having a reservoir in the lower portion thereof and opening at said lower end,
- (b) an injector tip member having an upper connection end and a lower dispersal end designed to be detachably secured by its connection end to the lower end of said injector body, said tip member having a generally centrally located cavity which opens upwardly so that said body reservoir and tip member cavity together form essentially a common chamber, said tip member having an axial valve stem guide bore extending from said cavity and opening at the dispersal end thereof, said tip member also being provided with at least one fuel delivery channel means extending generally axially parallel with said guide bore from said cavity to said fuel dispersal end,
- (c) a cylindrical plunger member axially slidably received in said plunger bore and having an inner end and having an outer end which is connected to a plunger actuator means for operatively moving said plunger into an open position from a normally closed position for allowing fuel from said plunger body first fuel passage means to pass by said plunger,
- (d) second fuel passage means for allowing said fuel to pass from said bore to said reservoir chamber,
- (e) an elongated valve member having a stem portion extending thru and being axially slidable within said guide bore and having a fuel dispersal head at the outer end thereof, said stem portion extending upwardly through said cavity and into said reservoir chamber and detachably receiving at the upper end thereof a valve retaining and adjustment member including stop means for limiting the downward movement of said adjustment member and said valve stem and having fuel delivery passage means therein for permitting fuel to pass therethrough to said cavity and fuel delivery channels, and
- (f) a first spring means in said cavity for resiliently biasing said adjustment member upwardly and above said stop means and also biasing said valve member upwardly to hold said dispersal head against said dispersal end in a normally closed position, and second resilient spring means in said internal bore for biasing said plunger member into said normally closed position.
3 more elements
Fuel injector mechanism for diesel engines, comprising:
- (a) an elongated generally cylindrical injector body member having an upper end and a lower end and an internal plunger bore, said body also being provided with fuel line connection means and first fuel passage means opening into and for admitting fuel under pressure to said bore, said injector body also having a reservoir chamber generally in the lower portion thereof,
- (b) an injector tip member having an upper connection end and a lower dispersal end designed to be detachably secured by its connection end to the lower end of said injector body, said tip member having a generally centrally located cavity which opens upwardly into said reservoir chamber such that a stop surface is defined, said tip member having an axial valve stem guide bore extending from said cavity and opening at the dispersal end thereof, said tip member also being provided with at least one fuel delivery channel means extending generally axially from said cavity to said fuel dispersal end,
- (c) a cylindrical plunger member slidably received in said plunger bore and having an inner end and having an outer end which is connected to a plunger actuator means for slidably moving said plunger into an open position for allowing fuel from said plunger body first fuel passage means to pass said plunger,
- (d) second fuel passage means interconnecting with said first fuel passage, when said plunger is in its open position for allowing said fuel to pass from said bore to said reservoir chamber,
- (e) an elongated valve member having a stem portion extending thru said guide bore and a fuel dispersal head at the outer end thereof, said stem portion extending upwardly through said cavity and into said reservoir chamber and threadably receiving at the upper end thereof a valve retaining and adjustment member, said adjustment member being of such diameter that it engages said stop surface and having fuel delivery passage means therein for permitting fuel to pass therethrough to said cavity and fuel delivery channels, and
- (f) a first spring means in said cavity for resiliently biasing said adjustment member upwardly and above said offset surface and biasing said valve member upwardly to hold said dispersal head against said dispersal end in a normally closed position, and second resilient spring means in said internal bore for biasing said plunger member into a normally closed position.
3 more elements
Fuel injector mechanism for diesel engines, comprising:
- (a) an elongated generally cylindrical injector body member having an upper end and a lower end and an internal plunger bore, said body also being provided with fuel line connection means and first fuel passage means opening into and for admitting fuel under pressure to said bore, said injector body also having a reservoir in the lower portion thereof and opening at said lower end,
- (b) an injector tip member having an upper connection end and a lower dispersal end designed to be detachably secured by its connection end to the lower end of said injector body, said tip member having a generally centrally located cavity which opens upwardly so that said body reservoir and tip member cavity together form essentially a common chamber, said tip member having an axial valve stem guide bore extending from said cavity and opening at the dispersal end thereof, said tip member also being provided with at least one fuel delivery channel means extending generally axially parallel with said guide bore from said cavity to said fuel dispersal end,
- (c) a cylindrical plunger member axially slidably received in said plunger bore and having an inner end and having an outer end which is connected to a plunger actuator means for operatively moving said plunger into an open position from a normally closed position for allowing fuel from said plunger body first fuel passage means to pass said plunger,
- (d) second fuel passage means in said body interconnecting with said first fuel passage when said plunger is in its open position and being interconnected to said reservoir for allowing said fuel to pass from said bore to said reservoir,
- (e) an elongated valve member having a stem portion extending thru and being axially slidable within said guide bore and having a fuel dispersal head at the outer end thereof, said stem portion extending upwardly through said cavity and into said common chamber and detachably receiving at the upper end thereof a valve retaining and adjustment member including stop means for limiting the downward movement of said adjustment member and said valve stem and having fuel delivery passage means therein for permitting fuel to pass therethrough to said cavity and fuel delivery channels, and
- (f) a first spring means in said cavity for resiliently biasing said adjustment member upwardly and above said stop means and also biasing said valve member upwardly to hold said dispersal head against said dispersal end in a normally closed position, and second resilient spring means in said internal bore for biasing said plunger member into said normally closed position.
3 more elements
A fuel injector system for a diesel engine in which said engine is provided with a fuel tank, common rail, foot throttle control, distributor driven by said engine, and an excess fuel return line from the common rail to said tank comprising:
- (a) pump means driven by said engine for creating a standing high pressure wave within said common rail,
- (b) non-pressure generating fuel injector means for each cylinder of said engine and connected to said common rail and in which each of the said injectors includes valve means, said valve means being operatively connected to an actuating solenoid mounted on said injector for moving said injector valve means to an open position to allow fuel to pass through said injector and into said cylinder,
- (c) distributor means for generating electronic first and second input signals in accordance with engine speed,
- (d) throttle position responsive electronic control means for generating an electronic third input signal, and
- (e) an electronic control unit which accepts said first, second and third signals for determining time of beginning fuel injection and for determining duration and thus the quantity of said fuel injection in accordance with said engine speed and load demands, said electronic control unit being operatively connected to said injector actuating solenoids so that said solenoids can be energized at electronically predetermined instances of time with respect to cylinder piston position and for electronically predetermined durations of time.
2 more elements
Dependencies are inferred from the claim text.