Control device of vehicle-onboard electric source

A control device of a vehicle-onboard electric source, comprising:

• a generator driven by an engine to generate electricity;
• a capacitor storing an electric energy from the generator during declaration of a vehicle to discharge the electricity to an electric load of the vehicle;
• and
• a controller including:
• an estimated-deterioration degree memorizing module configured to previously memorize an estimated-deterioration degree of the capacitor against a use term;
• a real-deterioration degree detecting module configured to detect a real-deterioration degree of the capacitor at a specified timing of the use term of the capacitor;
• a deterioration degree determining module configured to determine whether or not the real-deterioration degree exceeds the estimated-deterioration degree by comparing the real-deterioration degree detected by said real-deterioration degree detecting module and the estimated-deterioration degree memorized by said estimated-deterioration degree memorizing module;
• and
• an upper-limit voltage controlling module configured to set an upper-limit voltage of charging of said capacitor by said generator at a limit voltage which is lower than a specified voltage and corresponds to an excess degree of the real-deterioration degree over the estimated-deterioration degree when it is determined by said deterioration degree determining module that the real-deterioration degree exceeds the estimated-deterioration degree.