The injection systems have had a strong evolution in recent years, going from lowpressure system of a mechanical drive to complex high-pressure electronic systems. The electronics applied to this type of systems has allowed handling sequential injections and increasing the injection pressure. In the present work a review of the evolution of the injection systems in the last 20 years is made and how techniques have been developed to model the hydrodynamic behavior of the injectors in Diesel internal combustion engines. With this review, the trends for the modeling of the injection process are visualized, which has an important impact on the thermodynamic modeling and the prediction of the indicator parameters in Diesel internal combustion engines. This review allows to visualize the future development of this type of systems and the implications they have on the performance of internal combustion engines and the thermodynamic modeling of them. The optimization in the operation of diesel engines is possible by improving the operation of injection systems, which has led to more powerful engines but smaller.
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