An Engine Diagnostic Package (EDPAC) - Software for Analyzing Cylinder Pressure-Time Data

An engine diagnostic package known as EDPAC was designed to process engine cylinder pressure data automatically from single-cylinder and multicylinder engines in order to provide engine performance and combustion information. The EDPAC consists of several self-contained, independent software modules, each having a different analysis function: engine performance calculations, pressure-volume graphics, engine simulation for residual gas estimates, and heat release analysis. After each module is executed, computed results are stored automatically, providing input to subsequent software modules and a data base for future interrogation. The EDPAC saftware offers a user-oriented mechanism by which pressure-time data can be quickly and accurately reduced to meaningful results for evaluating engine combustion and performance. Processing cylinder pressure-time data with EDPAC includes test cell data reduction, generation of indicator diagrams, engine simulation to estimate residual gas fraction, heat release analysis, multicylinder engine summary, and summary of stored data. Routine use of the EDPAC to process pressure data reduces costs, effort, and turnaround time, and a data base containing performance, emission, and combustion data is automatically estabilished.

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