Fuel injection control valve with dual solenoids

• US 5,494,219 A
• Filed: 06/02/1994
• Issued: 02/27/1996
• Est. Priority Date: 06/02/1994
• Status: Expired due to Term

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Sommars, Mark F., Shinogle, Ronald D., Sturman, Oded E., Maley, Dale C.
• Primary Examiner(s): Kashnikow, Andres
• Assistant Examiner(s): Morris, Lesley D.
• Application Number:
  US08/252,943
• Time in Patent Office: 635 Days
• Field of Search: 239/88-96, 251/129.1, 335/220, 335/229, 335/253, 335/266, 335/268
• US Class Current: 239/88
• CPC Class Codes: F02B 2075/025 two
• CPC Class Codes: F02B 2275/14 Direct injection into combustion chamber
• CPC Class Codes: F02M 45/06 Pumps peculiar thereto
• CPC Class Codes: F02M 59/366 Valves being actuated electrically
• CPC Class Codes: F02M 59/466 Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A control valve assembly adapted for a fuel injector includes a valve seat with fluid inlet and fluid outlet. A poppet valve controls the flow of fluid through the valve seat. A pair of electrical actuators are selectively operably energized for releasing the poppet and moving the poppet to valve open and closed positions. Split fuel injection can be provided using either sequential operation or concurrent operation, i.e., phasing. Permanent magnets, holding current and residual magnetism enable the latching of the poppet valve in each of the valve open and closed positions.

Claims

1. A fluid pressure control valve assembly adapted for a fuel injector capable of injecting fuel during a fuel injection cycle, said control valve assembly comprising:

a valve body with fluid inlet and fluid outlet ports;

a valve seat communicating with said fluid inlet and said fluid outlet ports;

a poppet valve slidably mounted in said valve body between opposite respective fuel injection and non-fuel injection poppet valve positions controlling said fluid inlet and said fluid outlet ports through said valve seat;

means for maintaining said poppet valve in said opposite respective poppet valve positions;

first and second electrical actuators selectively operably energized for releasing said poppet valve from one of said poppet valve positions and for moving said poppet valve to the other of said poppet valve positions; and

means for selectively energizing said electrical actuators to provide at least two separate fuel injections during said fuel injection cycle.

2. A control valve assembly according to claim 1, wherein said means for maintaining said poppet valve in said opposite respective poppet valve positions includes a permanent magnet for at least one of said poppet valve positions.

3. A control valve assembly according to claim 2, including a second permanent magnet for the other of said poppet valve positions.

4. A control valve according to claim 1, wherein said means for maintaining said poppet valve in said opposite respective poppet valve positions includes residual magnetism means for at least one of said poppet valve positions.

5. A control valve assembly according to claim 4, wherein one of said electrical actuators is a solenoid and including solenoid holding current for maintaining said poppet valve in the other of said poppet valve positions.

6. A control valve assembly according to claim 1, wherein the first of said fuel injections during said fuel injection cycle supplies significantly less fuel over a smaller portion of said cycle compared to the second of said fuel injections.

7. A fluid pressure control valve assembly for a fuel injector comprising:

a valve body with fluid inlet and fluid outlet ports;

a valve seat communicating with said fluid inlet and said fluid outlet ports;

a poppet valve slidably mounted in said valve body between opposite respective fuel injection and non-fuel injection poppet valve positions controlling said fluid inlet and said fluid outlet ports through said valve seat;

permanent magnet means coupled to said poppet valve forming suitable magnetic forces for latching said poppet valve in said opposite respective poppet valve positions;

first and second electrical actuators operably energized for forming suitable counter magnetic forces to said permanent magnet means for releasing said poppet valve from one of said poppet valve positions and for moving said poppet valve to the other of said poppet valve positions; and

means for selectively energizing said electrical actuators to provide at least two separate fuel injections during said fuel injection cycle.

8. A fluid pressure control valve assembly adapted for a fuel injector providing a fuel injection cycle comprising:

a valve body with fluid inlet and fluid outlet ports;

a valve seat communicating with said fluid inlet and said fluid outlet ports, and including a flat seating surface;

a poppet valve slidably mounted in said valve body between respective poppet valve positions, with one poppet end having a poppet end portion including a concave end portion for sealingly engaging said flat seating surface of said valve seat to block said fluid inlet;

a first permanent magnet adapted for mounting at the other poppet end setting up a first magnetic force for holding said poppet valve in one of said poppet valve positions;

a first electrical actuator adapted for mounting at the other poppet end and operably energized for setting up a first counter-magnetic force to said first magnetic force tending to release said poppet valve from said one poppet valve position;

a second electrical actuator adapted for mounting at the other poppet end and operably energized for setting up a second counter-magnetic force to said first magnetic force for moving said poppet valve into said sealing engagement with said valve seat at said other poppet valve position; and

a second permanent magnet adapted for mounting at the other poppet end setting up a second magnetic force for holding said poppet valve in said other poppet valve position.

9. A control valve assembly according to claim 8, including return means for returning said poppet valve from said other poppet valve position to said one poppet valve position, said return means including energizing said second electrical actuator for setting up a reverse magnetic force to said second magnetic force tending to release said poppet valve from said other poppet valve position.

10. A control valve assembly according to claim 9, said return means including energizing said first electrical actuator for setting up a reverse magnetic force to said second magnetic force for disengaging said poppet end portion from said valve seat and returning said poppet valve to said one valve position where it is held by said first permanent magnet.

11. A control valve assembly according to claim 8, wherein said poppet valve concave end portion includes a knife edge for sealingly engaging said flat seating surface of said valve seat in a flat seat seal on valve closing during pressurized fuel injection and for responding to pressurizing fluid for rapidly opening said poppet valve.

12. A control valve assembly according to claim 8, wherein said fuel injector is a unit fuel pump-injector.

13. A control valve assembly according to claim 8, wherein each of said electrical actuators is a solenoid.

14. A control valve assembly according to claim 8, including means for selectively energizing said electrical actuators to provide at least two separate fuel injections during said fuel injection cycle.

15. A control valve assembly according to claim 14, wherein the first of said fuel injections during said fuel injection cycle supplies significantly less fuel over a smaller portion of said cycle compared to the second of said fuel injections.

16. An electronically-controlled unit fuel pump-injector providing a fuel injection cycle comprising:

an injector body having a fuel inlet and a fuel outlet;

a fuel injection pumping assembly, including a nozzle receiving fuel from said fuel inlet for injecting said fuel under pressure from said pumping assembly;

a control valve assembly for controlling the injecting of said fuel, said control valve assembly including a valve body with a valve seat having a valve seat inlet connected to said injector body fuel outlet and having a drain fuel outlet;

said control valve assembly including,

a poppet valve slidably mounted in said valve body between opposite respective fuel injection and non-fuel injection poppet valve positions controlling said fuel inlet and said fuel outlet through said valve seat;

means for maintaining said poppet valve in said opposite respective poppet valve positions;

first and second electrical actuators selectively operably energized for releasing said poppet valve from one of said poppet valve positions and for moving said poppet valve to the other of said poppet valve positions; and

means for selectively energizing said electrical actuators to provide at least two separate fuel injections during said fuel injection cycle.

17. An electronically-controlled unit fuel pump-injector according to claim 16, wherein said means for maintaining said poppet valve in said opposite respective poppet valve positions includes a permanent magnet for at least one of said poppet valve positions.

18. An electronically-controlled unit fuel pump-injector according to claim 17, including a second permanent magnet for the other of said poppet valve positions.

19. An electronically-controlled unit fuel pump-injector according to claim 16, wherein said means for maintaining said poppet valve in said opposite respective poppet valve positions includes residual magnetism means for at least one of said poppet valve positions.

20. An electronically-controlled unit fuel pump-injector according to claim 19, wherein one of said electrical actuators is a solenoid and including solenoid holding current for maintaining said poppet valve in the other of said poppet valve positions.

21. An electronically-controlled unit fuel pump-injector according to claim 16, wherein the first of said fuel injections during said fuel injection cycle supplies significantly less fuel over a smaller portion of said cycle compared to the second of said fuel injections.

22. An electronically-controlled fuel injector system comprising:

an injector body having a fuel inlet and a fuel outlet;

a fuel injection pumping assembly, including a nozzle receiving fuel from said fuel inlet for injecting said fuel under pressure from said pumping assembly;

a pressure control valve assembly for controlling the injecting of said fuel, said control valve assembly including a valve body with a valve seat having a valve seat inlet connected to said injector body fuel outlet and having a drain fuel outlet;

said pressure control valve assembly including,

a poppet valve slidably mounted in said valve body between said opposite respective fuel injection and non-fuel injection poppet valve positions controlling said fuel inlet and said fuel outlet through said valve seat;

means for maintaining said poppet valve in said opposite respective poppet valve positions;

first and second electrical actuators selectively operably energized for releasing said poppet valve from one of said poppet valve positions and for moving said poppet valve to the other of said poppet valve positions; and

means for selectively energizing said electrical actuators to provide at least two separate fuel injections during said fuel injection cycle.

23. An electronically-controlled fuel injector system according to claim 22, wherein said means for maintaining said poppet valve in said opposite respective poppet valve positions includes a permanent magnet for at least one of said poppet valve positions.

24. An electronically-controlled fuel injector system according to claim 23, wherein each of said electrical actuators is a solenoid.

25. An electronically-controlled fuel injector system according to claim 22, wherein said means for maintaining said poppet valve in said opposite respective poppet valve positions includes residual magnetism means for at least one of said poppet valve positions.

26. An electronically-controlled fuel injector system according to claim 25, wherein one of said electrical actuators is a solenoid and including solenoid holding current for maintaining said poppet valve in the other of said poppet valve positions.

27. An electronically-controlled fuel injector system according to claim 22, wherein said at least two fuel injections comprise a small amount of fuel followed by a much larger amount of fuel.

28. A fluid pressure control valve assembly adapted for a fuel injector providing a fuel injection cycle comprising:

a valve body with fluid inlet and fluid outlet ports;

a valve seat communicating with said fluid inlet and said fluid outlet ports;

a poppet valve slidably mounted in said valve body between respective poppet valve positions, with one poppet end portion sealingly engagable with said valve seat to block said fluid inlet;

a first permanent magnet adapted for mounting at the other poppet end portion setting up a first magnetic force for holding said poppet valve in one of said poppet valve positions;

a first electrical actuator adapted for mounting at the other poppet end portion and operably energized for setting up a first counter-magnetic force to said first magnetic force tending to release said poppet valve from said one poppet valve position;

a second electrical actuator adapted for mounting at the other poppet end portion and operably energized for setting up a second counter-magnetic force to said first magnetic force for moving said poppet valve into said sealing engagement with said valve seat at said other poppet valve position;

a second permanent magnet adapted for mounting at the other poppet end portion setting up a second magnetic force for holding said poppet valve in said other poppet valve position; and

means for selectively energizing said electrical actuators to provide at least two separate fuel injections during said fuel injection cycle.

29. A control valve assembly according to claim 28, including return means for returning said poppet valve from said other poppet valve position to said one poppet valve position, said return means including energizing said second electrical actuator for setting up a reverse magnetic force to said second magnetic force tending to release said poppet valve from said other poppet valve position.

30. A control valve assembly according to claim 29, said return means including energizing said first electrical actuator for setting up a reverse magnetic force to said second magnetic force for disengaging said poppet end portion from said valve seat and returning said poppet valve to said one valve position where it is held by said first permanent magnet.

31. A control valve assembly according to claim 28, wherein said fuel injector is a unit fuel pump-injector.

32. A control valve assembly according to claim 28, wherein each of said electrical actuators is a solenoid.

33. A control valve assembly according to claim 28, wherein the first of said fuel injections during said fuel injection cycle supplies significantly less fuel over a smaller portion of said cycle compared to the second of said fuel injections.

34. A fluid pressure control valve assembly adapted for a fuel injector capable of injecting fuel during a fuel injection cycle, said control valve assembly comprising:

a valve body with fluid inlet and fluid outlet ports;

a valve seat communicating with said fluid inlet and said fluid outlet ports;

a poppet valve slidably mounted in said valve body between opposite respective fuel injection and non-fuel injection poppet valve positions controlling said fluid inlet and said fluid outlet ports through said valve seat;

means for maintaining said poppet valve in said opposite respective poppet valve positions including residual magnetism means for at least one of said poppet valve positions; and

first and second electrical actuators selectively operably energized for releasing said poppet valve from one of said poppet valve positions and for moving said poppet valve to the other of said poppet valve positions.

35. A control valve assembly according to claim 34, wherein one of said electrical actuators is a solenoid and including solenoid holding current for maintaining said poppet valve in the other of said poppet valve positions.

36. An electronically-controlled unit fuel pump-injector providing a fuel injection cycle comprising:

an injector body having a fuel inlet and a fuel outlet;

a fuel injection pumping assembly, including a nozzle receiving fuel from said fuel inlet for injecting said fuel under pressure from said pumping assembly;

a control valve assembly for controlling the injecting of said fuel, said control valve assembly including a valve body with a valve seat having a valve seat inlet connected to said injector body fuel outlet and having a drain fuel outlet;

said control valve assembly including,

a poppet valve slidably mounted in said valve body between opposite respective fuel injection and non-fuel injection poppet valve positions controlling said fuel inlet and said fuel outlet through said valve seat;

means for maintaining said poppet valve in said opposite respective poppet valve positions including residual magnetism means for at least one of said poppet valve positions; and

first and second electrical actuators selectively operably energized for releasing said poppet valve from one of said poppet valve positions and for moving said poppet valve to the other of said poppet valve positions.

37. An electronically-controlled unit fuel pump-injector according to claim 36, wherein one of said electrical actuators is a solenoid and including solenoid holding current for maintaining said poppet valve in the other of said poppet valve positions.