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Caterpillar Inc. has developed a new diesel engine fuel system, powered by hydraulics and controlled electronically. This Hydraulic Electronic Unit Injector (HEUI) requires no mechanical actuating or mechanical control devices. HEUI offers many advantages over conventional diesel engine fuel injection systems. The HEUI design and development process focused on providing a product which meets the customers' needs for a reliable, cost effective fuel injection system with performance characteristics enabling the engine to meet future stringent emissions and noise regulations. This paper describes some of the unique hydraulic and structural analysis tools and techniques, and the integration of the design, analysis, test, and manufacturing processes used in the development of the HEUI product.

Caterpillar Inc. has developed a new diesel engine fuel system, powered by hydraulics and controlled electronically. This Hydraulic Electronic Unit Injector, (HEUI), requires no mechanical actuating or mechanical control devices, and offers many advantages over conventional fuel injection systems. Inherent features of the HEUI Fuel System include injection pressure control independent of engine load or speed, totally flexible injection timing, and full electronic control of injection parameters. Packaging the HEUI Fuel System on an engine is simple, as the injector is compact and available in a variety of configurations. The hydraulic actuating circuit is straightforward, using lubricating oil from the engine sump. Hydraulic lines may be internal to the engine or external. This paper describes the Caterpillar HEUI Fuel System, its operating features, performance advantages, and application to diesel engines.