Cummins Engine Company, Inc.

Raymond J Amlung

George L Muntean

Norman C Blizard

Lester L Peters

Thomas M Yonushonis

Edward D Smith

William David Daniel

Dan K Vetters

Mark Pounder

Thomas Kozlowski

A lube oil and fuel blending system, pumping device and method are provided which effectively, inexpensively and controllably removes used lube oil from an engine and delivers the lube oil to the fuel system for consumption within the engine. The lube oil and fuel blending system includes a fuel pumping device or injector containing a bore and a plunger reciprocally mounted in the bore for movement through a retraction stroke and an advancement stroke, each having a predetermined stroke length. A fuel drain circuit communicates with the bore at a drain location spaced a predetermined seal length axially along the bore from an outer opening of the bore through which the plunger extends. The predetermined seal length is specifically designed less than the predetermined stroke length to cause lube oil on the outer portion of the plunger to be delivered by the plunger to the fuel drain circuit at the drain location. Fuel leakage through the fuel drain circuit washes the lube oil from the plunger thereby blending the lube oil and fuel and delivering the blend to the fuel supply system via a return line. A variable restriction valve may be provided in the return line to control the leakage flow. Therefore, the predetermined seal length can be chosen relative to the stroke to achieve a desired leakage rate. In another embodiment, an undercut may be used to increase the used lube oil leakage rate.

Lubricating oil and fuel blending system

A pump system for preventing hot start knock in a diesel engine following engine shut down carried by fuel leakage into one or more of the combustion chambers of a multiple-cylinder internal combustion engine equipped with a fuel system including open nozzle injectors connected with a common rail. The system includes a transfer pump (46) in fluid communication with the common rail (50) and the fuel tank (48) for pumping fuel out of the common rail and into the fuel tank. A transfer pump control module (82) is provided for actuating the transfer pump (46) for a period of time following engine shut down to remove a sufficient amount of fuel from the common rail to prevent fuel from leakage through the open nozzles. The control system module may include a timer (96) and a voltage sensor (86) to sense condition of a fuel shut off valve (64). A retrofit kit (FIG. 5) is provided including a control module bracket (98) and a transfer module bracket (102).

Pump system for preventing hot start knock in a diesel engine

A leak prevention device including an expandable chamber and control valve for preventing fuel leakage into the combustion chambers of a internal combustion engine equipped with a common rail fule injection system including open nozzle injectors and a shut off valve mounted in the common rail upstream of the fuel injectors to isolate, when closed, the fuel injectors from the source of fuel under pressure. The expandable chamber contains a variable volume held in its collapsed condition during engine operation and expanded upon engine shutdown sufficiently to prevent the flow of fuel from any injector into the corresponding combustion chamber. The control valve may be a three way valve for controlling the expansion of the variable volume of the expandable chamber The leak prevention device includes a housing assembly connected with a fuel drain and contains an outlet passage fluidically connected at one end with the variable volume and at the other end with the fuel drain and an outlet check valve for allowing fuel to flow in only one direction from the variable volume into the fuel drain. A control circuit is provided to energize solenoids for operating the shut off valve and control valve.

Variable volume chamber device for preventing leakage in an open nozzle

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Columbus, IN, United States of America

Raymond J Amlung