| US 7,495,411 B2 | ||
| Controller for an electric four-wheel-drive vehicle | ||
| Satoru Kaneko, Naka (Japan); Shiho Izumi, Hitachi (Japan); Tatsuyuki Yamamoto, Mito (Japan); Kenta Katsuhama, Hitachinaka (Japan); Shigeru Akaishi, Isesaki (Japan); Yasuo Matsunaga, Sagamihara (Japan); and Hidehiko Sugita, Zama (Japan) | ||
| Assigned to Hitachi, Ltd., Tokyo (Japan); and Nissan Motor Co., Ltd., Yokohama-shi (Japan) | ||
| Filed on Jan. 24, 2007, as Appl. No. 11/657,032. | ||
| Claims priority of application No. 2006-052315 (JP), filed on Feb. 28, 2006. | ||
| Prior Publication US 2007/0200529 A1, Aug. 30, 2007 | ||
| Int. Cl. H02P 27/04 (2006.01) | ||
| U.S. Cl. 318—801 [318/140; 318/800; 180/65.1; 180/65.3] | 9 Claims |
| 1. A controller for an electric four-wheel-drive vehicle which includes an internal combustion engine for giving driving force
to wheels of an automobile, a generator connected to the internal combustion engine for outputting DC power by using rotational
power of the internal combustion engine, an inverter for directly converting the DC power, which is output from the generator,
to AC power, and an AC motor for driving the other wheels by using an output from the inverter, the controller comprising:
control means for generating desired torque from the AC motor by controlling the inverter,
wherein, when the power generated by the generator is larger than the power consumption of the inverter and the AC motor to
generate excessive power, said control means consumes the excessive power by increasing a loss in the AC motor,
wherein, when the loss in the AC motor is to be increased, said control means increases an armature current in the d-axis
direction, which is a rotor flux direction of the AC motor.
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