Gm Global Technolgoy Operations, Inc.

Electro-motive Diesel, Inc.

Richard J Lill

Michael B Goetzke

Paul Gottemoller

Ramesh B Poola

Richard Wayne Tupek

Wojciech T Pierga

Jerry Van Polen

David Corba

Keith E Solomons

Donald E Meyer

Hassan Z Hannon

A hybrid fuel injection system which allows electronic control over the injection processes, wherein selective rate shaping and multiplicity of injections is possible. The hybrid fuel injection system consists of an add-on common rail system (CRS) which provides supplemental fuel injections with respect to the main fuel injections provided by a unit pump system (UPS). Additionally, the CRS can serve to provide fuel injections as necessary to effect a 'limp-home' mode of engine operation in the event of a failure of the UPS. Both the CRS and the UPS use common fuel supply, return, injector, and electronic controller.

Hybrid fuel injection system

An electronically-controlled air injection system implemented in three different embodiments with respect to each cylinder. A first embodiment includes a T-adapter, an air solenoid, a fuel injector, and a control unit. The T-adapter receives pressurized fuel and pressurized air from an air solenoid, and outputs these to the fuel injector. The air solenoid controls the flow of air to the fuel injector via the control unit. The second embodiment includes a modified fuel injector, an air solenoid, and a control unit. The fuel injector is modified by forming therein an air passage and a communicating sac, wherein the sac communicates with the fuel valve. Compressed air is supplied through an air solenoid to the air passage. The third embodiment includes a modified cylinder head, an air solenoid, and a control unit. Compressed air is supplied through an air solenoid to at least one combustion chamber cylinder port in the cylinder head.

Electronically-controlled late cycle air injection to achieve simultaneous reduction of NOx and particulates emissions from a diesel engine

Ignition delay in a diesel engine is reduced or eliminated by a fuel injector or igniter nozzle which includes energy supplying fuel conditioning means at the point of fuel injection into a cylinder. A preferred embodiment includes an electrically-conductive injection valve reciprocable in a conductive nozzle body and seatable on a valve seat to stop fuel flow through nozzle orifices. The injection valve is electrically insulated from the body except at its contact with the valve seat and is connected to an electrical charge, at least during opening of the valve. An electrical spark discharge is thus generated between the injection valve and the valve seat upon opening of the valve. Initially injected fuel passes through the arc and is conditioned by the spark energy to ignite almost immediately by compression ignition upon entering the engine cylinder and thus essentially eliminate diesel ignition delay.

Diesel injection igniter and method

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Naperville, IL, United States of America

Richard J Lill