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An electronically controlled governor was developed for a generator equipped with a medium size gasoline engine. Among the available control methods, LQ and PID were considered since they are high practical and require less computations. Based on a numerical simulation, the PID control method was chosen for the governor system because of its simplicity in tuning the control parameters. To ensure the reliability of the governor system for volume production, the system has been tested with regard to the influence of environmental changes, and the deviation of engine performance and its deterioration. Under all of the above severity tests, the governor system has been confirmed to provide an excellent performance and stability in the power output far exceeding the ISO-A1 standards.