Nissan Motor Company Limited

Yuki Kosaka

Hiroshi Iwano

Kazuhiro Takeda

Tomoyuki Hanyu

Susumu Komiyama

Hiraku Ooba

A hybrid-vehicle driving system includes an engine, a transmission, a first motor/generator provided between the engine and the transmission, and a battery that can charge and discharge the first motor/generator. When an estimated output voltage of the first motor/generator becomes higher than or equal to a predetermined voltage during a gear shift operation of the transmission, the battery is electrically disconnected from the driving system, and the voltage of a power line on the side of the first motor/generator is then decreased so as to charge the battery.

Driving system for hybrid vehicle

A power accumulating unit of a power supply system includes a first switch section configured to achieve a first voltage output state in which an output voltage is substantially equal to a first motor driving voltage and a second switch section configured to achieve a second voltage output state in which the output voltage is substantially equal to a second motor driving voltage that is higher than the first motor driving voltage. A voltage switching control part is configured to perform a voltage switching control to switch between the first motor driving voltage and the second motor driving voltage by alternately operating the first and second switch sections to repeatedly switch between the first voltage output state and the second voltage output state.

Power supply system and power supply system control method

To protect the inverters and motor generators from damage caused by abnormal currents resulting from the sudden changes in voltage that occur when changing the battery voltage. A vehicle equipped with an engineand first and second motor-generatorsandthat can generate electricity by being driven by engineor from regeneration of kinetic energy of the vehicle, power supply linethat connects first motor-generatorwith second motor-generatorand batteryconnected via switchin the middle of electric power supply lineWhen changing the voltage of batteryswitchis opened before the voltage of batteryis changed, and switchis closed only after one of the motor generatorsandis caused to generate electric power or propel the vehicle in order to reduce the difference in voltage between power supply lineand battery

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Yokohama, Japan

Yuki Kosaka