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This paper details the development of a mathematical model to simulate the incylinder processes in the Caterpillar 1.7L Diesel engine and the results obtained during compression stroke and early part of the combustion stroke. The model includes accurate representation of the geometry of the 1.7L combustion chamber via Body Fitted Coordinates (BFC) which conform to the shape of the piston-dish and cylinder. Also included are the combustion model and evaporation model. This 3-D model predicts average cylinder pressure and temperature variations with degree crank angle which are in good agreement with Caterpillar measurements for this engine.

Diesel engine manufacturers have been asking for new, innovative, flexible fuel injection systems in order to meet future diesel engine emission requirements throughout the world and improve engine performance. Engineers at Caterpillar have listened to these requests and developed a fuel system concept to meet their needs. This new fuel system is called the Next Generation Electronic Unit Injector (NGEUI). The new concept is adaptable to mechanically actuated electronic unit injector, hydraulic electronic unit injector, electronic unit pump, and pump/line/nozzle systems. Features of the new fuel system are listed below: 1. Fully controllable injection pressure independent of engine speed and load 2. Injection pressure capability to 207 MPa (30,000 psi) 3. Reduced drive train torsional excitation and improved hydraulic efficiency 4.