A dynamic model of a multi-port electronic fuel injection system, capable of analyzing fast fluid transients in the fuel, is presented. The model consists of distributed parameter models for fuel lines and lumped parameter models for the fuel pump, pressure regulator and injectors. Modal approximation is used to model fuel lines. An experimental test bench has been established, and comparison of simulation and experimental results shows excellent agreement in transient characteristics. Using this experimentally verified model, the effects of injector clogging and vapor in the fuel rail on pressure transients are examined. A bond graph model of the total system is presented to identify the proper formulation of each subsystem model.

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