Valve system for variable displacement diesel engine

Details Valve system for variable displacement diesel engine Valve system for variable displacement diesel engine

2002-02-20

2004-03-16

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S19800E, C123S090150, C123S1980DB

Reexamination Certificate

active

06705258

ABSTRACT:

I FIELD OF THE INVENTION
This invention relates to an improved valve system for a variable displacement Diesel engine.
II BACKGROUND OF THE INVENTION
U.S. Pat. No. 5,813,383 discloses a variable displacement Diesel engine for use in automotive, overland truck, locomotive, marine and industrial applications in which selected cylinders are deactivated and reactivated depending on the load that the engine encounters. The system is preferably computer controlled. If a deactivated cylinder is below the minimum temperature for combustion at the time of reactivation, the glow plugs are activated to bring the cylinder up to the temperature necessary for combustion.
III SUMMARY OF THE INVENTION
A. Objects of the Invention
One object of the present invention is to provide an improved valve system for variable displacement Diesel engines.
Another object of the present invention is to provide a valve system for motorcycle Diesel engines.
Other objects will be apparent from the following Description and Drawings.
B. Summary
In accordance with the present invention a supply valve
15
is provided in the Diesel fuel supply line
14
to a cylinder to be deactivated. A return fuel line
16
is provided. When the supply valve is open, the fuel is returned to the fuel supply tank
18
. In closed position fuel is directed to the top portion of the cylinder. The cylinder is provided with a conventional exhaust valve
24
. However, the intake valve
30
is modified to be located closer to the top
22
of the cylinder. The previous gap
31
(
FIG. 2
) of about ¼ inch is reduced to about 0.005 to 0.015 inches as indicated at
33
in FIG.
3
. This allows the intake valve to remain partially open instead of closed as the piston moves upwardly in the deactivated cylinder. Thus when the exhaust valve is closed, the intake valve allows air to exit from the cylinder when the exhaust valve is in the full up position of the piston. This arrangement thus avoids heat and exhaust products from non-deactivated cylinders from burning the modified intake valve. The modified intake valve is preferably operated by a cam to move the modified intake valve back and forth. The supply valve in the fuel line may be manually operated or computer controlled. This valve system is well adapted to large and small Diesel engines including motorcycle Diesel engines.


REFERENCES:
patent: 4204512 (1980-05-01), Brock, Jr.
patent: 5329895 (1994-07-01), Nishida et al.
patent: 5813383 (1998-09-01), Cummings
patent: 5881690 (1999-03-01), Park
patent: 6332446 (2001-12-01), Matsumoto et al.
patent: 6431154 (2002-08-01), Inoue

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