Abstract— This paper presents a digital speed governor system
for a gas engine based on TMS320F28335. In speed governor
system, hall sensor A04E is used to measure speed; L298N is
used to drive the step motor; torque vector control is used to
subdivise the angular of step motor. Fuzzy control and PID
control are used together, fuzzy control implement fast control,
PID control implement accurate control. Fuzzy PID control
improves dynamic response while the load change, and keep
the governor performing well in a wide operating range