Patent ID: 7208847

Claim:
A vehicular electric power generating system comprising: a vehicular electric generator rotatable by an engine mounted on a vehicle; a rotational speed changing device for transmitting rotational power generated by said engine to said vehicular electric generator to rotate said vehicular electric generator selectively in a relatively high first rotational speed range and a relatively low second rotational speed range; an electric power storage device chargeable with electric power by said vehicular electric generator; and a charge detecting device for detecting a charged quantity of said electric power storage device; wherein said vehicular electric generator is rotated in said first rotational speed range by said rotational speed changing device when said charged quantity detected by said charge detecting device is smaller than a predetermined value, and said vehicular electric generator is rotated in said second rotational speed range by said rotational speed changing device when said charged quantity detected by said charge detecting device is greater than said predetermined value.