Claims
- 1. A valve actuation system for a cylinder of an internal combustion engine, the cylinder having an intake valve and an exhaust valve, said valve actuation system comprising:an intake valve train for providing motion to operate the intake valve; an exhaust valve train for providing motion to operate the exhaust valve; an intake valve hydraulic actuator that selectively responds to motion of said intake valve train and causes the intake valve to open; an exhaust valve hydraulic actuator that selectively responds to motion of said exhaust valve train and causes the exhaust valve to open; a control valve for controlling the supply of hydraulic fluid of said intake valve hydraulic actuator and said exhaust valve hydraulic actuator to control the operation of said intake valve hydraulic actuator and said exhaust valve hydraulic actuator in response to the motion of said intake valve train and said exhaust valve train; and wherein the intake valve hydraulic actuator comprises a first master piston, a first slave piston, and a first variable volume fluid chamber formed between said first master and slave pistons; and the exhaust valve hydraulic actuator comprises a second master piston, a second slave piston, and a second variable volume fluid chamber formed between said second master and slave pistons.
- 2. The system according to claim 1, wherein said control valve is a solenoid actuated valve.
- 3. The system according to claim 1, wherein said control valve is a spool valve.
- 4. The system according to claim 1, wherein said second slave piston contacts the exhaust valve and said second master piston contacts the exhaust valve train.
- 5. The system according to claim 1, wherein said second master piston contacts the exhaust valve and said second slave piston contacts the exhaust valve train.
- 6. The system according to claim 1, where said control valve controls the amount of fluid in said second variable volume fluid chamber in order to selectively modify the openings of said exhaust valve in response to said exhaust valve train.
- 7. The system according to claim 1, wherein said exhaust valve train comprises a rocker arm.
- 8. The system according to claim 1, wherein said first slave piston contacts the intake valve and said first master piston contacts the intake valve train.
- 9. The system according to claim 1, wherein said first master piston contacts the intake valve and said first slave piston contacts the intake valve train.
- 10. The system according to claim 1, where said control valve controls the amount of fluid in said first variable volume fluid chamber in order to selectively modify the openings of said intake valve in response to said intake valve train.
- 11. The system according to claim 1, wherein the intake valve train comprises a rocker arm.
- 12. The system according to claim 1, wherein each of said hydraulic actuators comprises a hydraulic tappet.
- 13. The system according to claim 12, wherein said hydraulic tappet comprises a master piston and a slave piston, wherein said master piston includes a central bore and said slave piston is slidably disposed inside of said central bore.
- 14. The system according to claim 13, wherein said slave piston contacts one of said plurality of engine valves and said master piston contacts a valve train.
- 15. The system according to claim 1, further comprising a means for effectuating engine valve motion upon a loss of hydraulic pressure.
- 16. The system according to claim 15, wherein said means for effectuating engine valve motion comprises a mechanical link in the hydraulic actuator created when the second variable volume chamber completely collapses and the second master piston contacts the second slave piston directly in order to transfer motion from the exhaust valve train to the exhaust valve.
- 17. The system according to claim 15, wherein said means for effectuating engine valve motion comprises a mechanical link in the hydraulic actuator created when the first variable volume chamber completely collapses and the first master piston contacts the first slave piston directly in order to transfer motion from the intake valve train to the intake valve.
- 18. An engine valve actuation system for a cylinder of an internal combustion engine that includes, the cylinder having a first intake valve, a second intake valve, a first exhaust valve and a second exhaust valve, said system comprising:an intake valve train for providing motion to operate the first and second intake valves; an exhaust valve train for providing motion to operate the first and second exhaust valves; a first intake valve actuator that selectively responds to motion of said intake valve train and causes the first intake valve to open; a second intake valve actuator that selectively responds to motion of said intake valve train and causes the second intake valve to open; a first exhaust valve actuator that selectively responds to motion of said exhaust valve train and causes the first exhaust valve to open; a second exhaust valve actuator that selectively responds to motion of said exhaust valve train and causes the second exhaust valve to open; a first control valve for controlling the operation of said first intake and said first exhaust valve actuators; a second control valve for controlling the operation of said second intake and said second exhaust valve actuators; and wherein said first intake valve actuator said second intake valve actuator, said first exhaust valve actuator and said second exhaust valve actuator are hydraulic tappets comprising: a slave piston; a master piston that includes a central bore; and wherein said slave piston is slidably disposed within the central bore forming a variable volume chamber between said master and slave piston.
- 19. The system of claim 18, wherein said first and second control valves are solenoid valves.
- 20. A valve actuation system for an internal combustion engine having a plurality of cylinders, each cylinder having at least one valve, said valve actuation system comprising:a first valve train for providing motion to operate the at least one valve of a first cylinder of the plurality of cylinders; a second valve train for providing motion to operate the at least one valve of a second cylinder of the plurality of cylinders; a first valve actuator that selectively responds to motion of said first valve train to operate the at least one valve of the first cylinder of the plurality of cylinders; a second valve actuator that selectively responds to motion of said second valve train to operate the at least one valve of the second cylinder of the plurality of cylinders; and a control valve assembly for controlling the operation of said first valve actuator and said second valve actuator in response to motion of said first valve train and said second valve train.
- 21. The valve actuation system according to claim 20, wherein the at least one valve of the first cylinder is an intake valve, and the at least one valve of the second cylinder is an intake valve.
- 22. The valve actuation system according to claim 20, wherein the at least one valve of the first cylinder is an exhaust valve, and the at least one valve of the second cylinder is an exhaust valve.
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims priority to U.S. Provisional Applications Serial No. 60/066,376, entitled “LOST MOTION SYSTEM FOR INDEPENDENT CONTROL OF MULTIPLE ENGINE VALVES,” filed on Nov. 21, 1997 and Serial No. 60/064,353, “FAIL SAFE LOST MOTION FULL AUTHORITY VALVE ACTUATION SYSTEM” filed on Nov. 4, 1997.
US Referenced Citations (20)
Foreign Referenced Citations (1)
Number |
Date |
Country |
3815668 A1 |
Nov 1989 |
DE |
Provisional Applications (2)
|
Number |
Date |
Country |
|
60/066376 |
Nov 1997 |
US |
|
60/064353 |
Nov 1997 |
US |