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The electronic throttle valve is the main actuator of the air intake system in Otto cycle engines. The electronic control of this valve at the inlet system allows improved engine performance, fuel economy and exhaust gas reduction with consequent decrease in CO2, HC and other gases produced by the combustion of hydrocarbons. This article discusses the performance of the engine speed control of an electric power generator set by controlling the angular position of the throttle valve. This engine, the object of this study, was originally from the Diesel cycle and has been adapted for the use in both Diesel and Otto cycles in order to operate with different types of fuels and make it possible to choose the most economically viable. For this work, the focus has been only on the control technique that enabled the engine operation in the Otto cycle. An appropriate cascade control strategy was developed for the system under study and this strategy was validated by experimental tests. The results showed oscillations in the throttle valve response, as a signal above the overshoot of a maximum of 4.0% and an accommodation time-out of 20 seconds. These oscillations are natural due to the dynamics of the throttle valve systems and the internal combustion engine being different. These values meet the demand of the studied system and the presented results of the behavior of the electronic throttle valve demonstrate that it is suitable for use in the electric power generator set.

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