Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1995-06-12
1997-10-07
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123496, 239 96, F02M 3704
Patent
active
056736690
ABSTRACT:
An improved hydraulically-actuated fluid injector system comprises a hydraulically-actuated fuel pressurization member, a fluid storage chamber, and a direct-operated check. Pressurization of fluid in the storage chamber begins before the start of fluid injection. Fluid injection begins by hydraulically unbalancing the check. Fluid injection ends by hydraulically balancing the check to allow a biasing device to close the check. Preferably, actuating fluid that is spilled from the fuel pressurization member (to end fuel injection) is communicated to a hydraulic motor which drives a source of pressurized hydraulically-actuating fluid.
The present invention provides improved control of several fluid injection parameters, including higher peak fluid injection capability and less fluid injection pressure drop at the end of injection, resulting in improved engine performance and lower emissions, noise, and wear. The present invention also improves efficiency of operation due to the above hydraulic energy recovery feature.
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Maley Dale C.
Shinogle Ronald D.
Caterpillar Inc.
Keen Joseph W.
McCracken W. E.
Moulis Thomas N.
Woloch Anthony N.
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