Patent ID: 7911188

Claim:
A power generation control apparatus of a rotating electrical machine for a vehicle, characterized by comprising: a power control unit that is connected to said rotating electrical machine for controlling thereof, said rotating electrical machine having an armature winding and a field winding and being mechanically coupled with an internal combustion engine for the vehicle so as to operate at least as a generator; a storage battery that delivers and receives electric power to and from said rotating electrical machine through said power control unit; and a rotational speed detection part that detects a rotational speed of said rotating electrical machine; wherein when the detected rotational speed of said rotating electrical machine is less than or equal to a first predetermined rotational speed during operation of said rotating electrical machine as said generator, said power control unit controls a power generating operation of said rotating electrical machine in a first mode based on a compensation current for phase control to said armature winding and an energization current to said field winding, and when the detected rotational speed of said rotating electrical machine is higher than said first predetermined rotational speed, said power control unit controls the power generating operation of said rotating electrical machine in a second mode based on a field duty that controls the energization current to said field winding; and wherein said power control unit includes: a generation voltage command value calculation section that sets a current generation voltage command value for each of said first and second modes so as to follow a final target value of a generation voltage to said storage battery; and a generation voltage update calculation command section that instructs a next generation voltage command update timing, an amount of increase and an amount of decrease of said generation voltage command value to said generation voltage command value calculation section based on a state of said rotating electrical machine and a state of said storage battery, and wherein said generation voltage update calculation command section individually sets the next generation voltage update timing, the amount of increase and the amount of decrease of said generation voltage command value at least in a power generating operation immediately after the starting of said internal combustion engine and a power generating operation not immediately after said engine starting.