WO1998002646B1

WO1998002646B1 - A hydraulically controlled intake/exhaust valve

Info

Publication number: WO1998002646B1
Application number: PCT/US1997/011967
Authority: WO
Filing date: 1997-07-09
Publication date: 1998-06-11

Abstract

A camless valve assembly for an internal combustion engine which utilizes a plurality of three position control valves to open and close the intake and exhaust valves of the assembly. Each valve is coupled to a plurality of hydraulically driven pins that move the valve between the open and closed positions. The flow of fluid to the pins is controlled by the three position digitally latched solenoid actuated control valves that can be switched between a first position, a second position and a neutral position. When a control valve is in the first position the fluid flows into the pins and moves the valve. When the control valve is in the second position the fluid can flow away from the pins to allow the valve to move back to the original position. When the control valve is in the neutral position the fluid does not flow so that the valve cannot move. The control valve can be switched by a controller that can move and maintain a valve at any position during any cycle of the engine.

Claims

AMENDED CLAIMS

[received by the International Bureau on 5 January 1998 (05.01.98); original claim 7 and 15 cancelled; original claims 1, 4, 6, 8, 10 and 20 amended; remaining claims unchanged (6 pages)]

1. A valve assembly for an internal combustion chamber, comprising: a valve that moves between an open position, a closed position, and an intermediate position to allow a gas to flow into or from the internal combustion chamber; an hydraulic system that provides a fluid which moves said valve from the closed position to the open position; and, a three position control valve which controls the flow of the fluid within said hydraulic system, wherein said three position control valve includes a first position which opens said valve, a second position which closes said valve and a neutral position which maintains said intermediate position of said valve.

2. The valve assembly as recited in claim 1, wherein said three position control valve includes a spool that is located within a housing and maintained in the neutral position by a pair of springs, said three position control valve further including a first solenoid that pulls said spool to the first position and a second solenoid that pulls said spool to the second position. 17

3. The valve assembly as recited in claim 2, wherein said first and second solenoids are actuated by a digital pulse.

4. The valve assembly as recited in claim 1, further comprising a first pin that is in fluid communication with the fluid and which moves said valve to the open position when said three position control valve is in the first position.

5. The valve assembly as recited in claim 4, wherein said three position control valve is a three-way valve.

6. The valve assembly as recited in claim 4, further comprising a second pin that is in fluid communication with the fluid and which moves said valve to the closed position when said three position control valve is in the second position.

8. The valve assembly as recited in claim 4, further comprising a booster spring that is coupled to said first pin to bias said valve to the open position.

9. The valve assembly as recited in claim 6, further comprising a collar that couples said first pin and said second pin to said valve. 18

10. An internal combustion engine, comprising: a block that has an internal combustion chamber, an exhaust port and an intake port; a valve housing that is attached to said block; an intake valve that is coupled to said valve housing and which can move between an open position and a closed position to control a flow of air through said intake port; an exhaust valve that is coupled to said valve housing and which can move between an open position, a closed position and an intermediate position to control a flow of exhaust through said exhaust port; a first intake pin that is in fluid communication with a fluid that moves said intake valve to the open position; a first exhaust pin that is in fluid communication with the fluid to move said exhaust valve to the open position; a three position intake control valve which controls the movement of said first intake pin, wherein said three position intake control valve includes a first position which allows the fluid to flow to said first intake pin, a second position which allows fluid to flow from said first intake pin and a neutral position which does not allow fluid flow and maintains said intake valve in said intermediate position; and, a three position exhaust control valve which controls the movement of said first exhaust pin, wherein said three position exhaust control valve includes a first position which allows the fluid 19

to flow to said first exhaust pin, a second position which allows fluid to flow from said first exhaust pin and a neutral position which does not allow fluid flow and maintains said exhaust valve in said intermediate position.

11. The engine as recited in claim 10, wherein said three position intake and exhaust control valves each include a spool that is located within a housing and maintained in the neutral position by a pair of springs, said three position intake and exhaust control valves further including a first solenoid that pulls said spool to the first position and a second solenoid that pulls said spool to the second position.

12. The engine as recited in claim 11, wherein said first and second solenoids are actuated by a digital pulse.

13. The engine as recited in claim 10, wherein said three position intake and exhaust control valves are each a three-way valve.

14. The valve assembly as recited in claim 10, further comprising a second intake pin that is in fluid communication with the fluid and which moves said intake valve to the closed position when said three position intake control valve is in the second position, and a second exhaust pin 20

that is in fluid communication with the fluid and which moves said exhaust valve to the closed position when said three position exhaust control valve is in the second position.

16. The valve assembly as recited in claim 10, further comprising a pair of booster springs that are coupled to said first intake and exhaust pins to bias said intake and exhaust valves to the open positions.

17. The valve assembly as recited in claim 14, further comprising a pair of collars that couple said first and second intake and exhaust pins to said intake and exhaust valves .

18. A method for opening a valve of an internal combustion chεmber, comprising the steps of: a) switching a control valve to a first position to direct a flow of fluid that moves a valve to an open position; b) switching said control valve to a neutral position to terminate the flow fluid so that said valve remains in the open position; and, c) switching said control valve to a second position so that said valve moves to a closed position. 21

19. The method as recited in claim 18, wherein said control valve is switched with a digital pulse.

20. The valve assembly as recited in claim 1, further comprising: a valve housing which has a bore that contains a internal thread, wherein a stem that extends through said bore of said valve housing, said stem has an external thread that cooperates with said internal thread of said valve housing to rotate said valve each time said valve moves between the open and closed positions.