Electric generating system for automobiles and its control method

In a driving apparatus for a four-wheel drive vehicle having first and second driving axles and a drive system that includes an internal combustion engine which drives said first driving axle and is coupled to a generator that supplies power to a battery, said second driving axle being driven by a motor force;

• electric driving apparatus comprising:
• a second generator driven by said internal combustion engine;
• a motor for generating said motor force;
• and
• a control unit for controlling a drive of said second generator and a drive of said motor, wherein
• said second generator supplies power exclusively for driving said motor;
• said second generator has a power output that is higher than a power output of said first generator;
• said second generator is arranged in an engine compartment, together with said internal combustion engine and said first generator;
• said second generator is arranged at a side of said internal combustion engine together with said first generator, and at a position which is below said first generator;
• said motor uses electric power generated by said second generator to generate said motor force;
• said motor is arranged at a bottom portion of said vehicle, in a vicinity of a differential gear having a reduction mechanism for transmitting a driving force to said second driving axle;
• said motor is connected mechanically to said differential gear via a clutch.