Nissan Motor Company Limited

Kazuhiro Takeda

Hiroshi Iwano

Tomoyuki Hanyu

Hiraku Ooba

Yuki Kosaka

Susumu Komiyama

Shinobu Kamada

Yasushi Narita

Itsuro Muramoto

Hitoshi Kidokoro

Eiji Ejiri

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

Hybrid vehicle equipped with a variable voltage battery

A hybrid drive system has an engine (); a motor-generator (); a transmission () for converting drive force inputted from at least one of the engine () and the motor-generator () and transmitting the converted drive force to a drive wheel (); a first rotating shaft (), a second rotating shaft () and a third rotating shaft () disposed mutually in parallel. The drive system includes a first gear wheel () disposed coaxially with the first rotating shaft (); a first clutch () for engaging/disengaging the first gear wheel () with/from the first rotating shaft (); a second gear wheel () disposed coaxially with the second rotating shaft (); a second clutch () for engaging/disengaging the second gear wheel () with/from the second rotating shaft (); a third gear wheel (), engaging with the first gear wheel () or the second gear wheel () and disposed coaxially with the second rotating shaft () or the first rotating shaft (); and a third clutch () for engaging/disengaging the third gear wheel () with/from the first rotating shaft () or the second rotating shaft (). The motor-generator () is connected to the first rotating shaft (). The engine () is connected to the third rotating shaft (). The transmission () includes an input disc () connected to the third rotating shaft; an output disc () disposed coaxially with the input disc; and a power roller () sandwiched in a tiltable fashion between the input disc and the output disc.

Hybrid drive system

A hybrid electric vehicle runs by torque of an internal combustion engine () and torque of an electric motor () that are output through a transmission. The transmission comprises a first shaft (, A) that is connectable to the internal combustion engine (), a second rotation shaft (, A) that is connectable to the electric motor (), and a third rotation shaft (, A) that is connected to drive wheels (). A plurality of combinations of gears that are selectively applied are provided between the first rotation shaft (, A) and the third rotation shaft (, A), and between the second rotation shaft (, A) and the third rotation shaft (, A). A variety of power transmissions to the drive wheels () are made possible by further providing a clutch () that connects the first rotation shaft (, A) and the second rotation shaft (, A).

Transmission for a vehicle

A gyration angle .phi. of a power roller (3) of a toroidal continuously variable transmission (10) is made to vary via a step motor (4) and control valve (5). A controller (61) calculates a feedback control amount v of a step motor (4) so that a real speed ratio i of the transmission (10) coincides with a target speed ratio i*. The controller (61) calculates a command value u by correcting a control value v based on a non-linear relation between the gyration angle .phi. and the real speed ratio i, and controls the actuator (4) based on the command value u.

Speed ratio controller and control method of continuously variable

In a torque converter of a coreless type allowing and utilizing a fluid flow in a central core region, the impeller blade exit angle is made smaller in the central core region than in an outer region surrounding the core region so as to increase the velocity and amount of the fluid flow circulating in the outer region and participating in torque multiplication, and decrease the velocity and amount of the fluid flow circulating in the core region like the fluid flow in a fluid coupling.

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Yokosuka, Japan

Kazuhiro Takeda