Voltage controller for vehicle using averaged status signal

A voltage controller electrically connected to a power generator mounted on a vehicle, the power generator having a field winding electrically connected in series to a switching means and the power generator being connected to a battery, the voltage controller comprising:

• a voltage controlling means for controlling an output voltage of the power generator and a terminal voltage of the battery by intermittently switching the switching means on and off to control an amount of field current flowing through the field winding to control the output voltage of the power generator and the terminal voltage of the battery;
• a signal generating means for generating a power generator state signal by repeatedly measuring a state of the power generator at predetermined measurement periods;
• and
• a signal averaging means for performing an exponentially weighted averaging of the power generator state signal generated by the signal generating means, wherein
• the signal averaging means executes the weighted averaging within a predetermined averaging period and updates the weighted averaging at each of the predetermined measurement periods,
• the signal generating means generates at least one of a duty ratio of the switching means that is conducted intermittently and a current value of the field current flowing to the field winding as the power generator state signal,
• the switching means is intermittently conducted at a predetermined period, and
• the signal generating means measures one of the duty ratio and the current value and generates the power generator state signal at the predetermined measurement period that is equal to the predetermined period of the switching means, regardless if the switching means is in operation.