This paper presents a phenomenological and semi-empirical simulation model to predict the injection rate of a diesel solenoid valve injector based on a few injection quantity measurements and indications (EMI). The approximate injection rate will be used as the input data for a subsequent model, which simulates the rate of heat release (ROHR). The injection rate model encompasses algebraic relations and differential equations deviating from the equations of motion and conservation, which describes the characteristic processes in the injector by using modular submodules. The process and its assumptions are explained step by step for each submodule. In addition, the injection rate predictions are presented and compared with experimental results arising from the selected reference solenoid valve injector.