Hitachi, Ltd.

Nissan Motor Company Limited

Kenta Katsuhama

Satoru Kaneko

Tatsuyuki Yamamoto

Shiho Izumi

Shigeru Akaishi

Kazuya Motegi

Hideki Miyazaki

Tokihito Suwa

Kimihisa Furukawa

Yuuichirou Takamune

Masaru Ito

Hisaya Shimizu

Yasuo Matsunaga

Hidehiko Sugita

Hisao Iino

Satoru Kaneka

Satoru Ohno

Katsuyo Tsushima

To provide a motor control apparatus that uses an inverter to drive an AC motor and hybrid automotive control apparatus adapted to drive an AC motor by use of an inverter while reducing torque pulsations during switching from PWM driving to rectangular-wave driving. The motor control apparatushas a PWM driving mode in which to input a PWM signal to the inverterand perform PWM driving of the AC motor, and a rectangular-wave driving mode in which to input a rectangular-wave signal to the inverterand perform rectangular-wave driving of the AC motor. For switching from the PWM driving mode to the rectangular-wave driving mode, a driving-pulse switching blockperforms the switching process within a maximum pulse-width range of high-level or low-level pulses developed in the PWM driving mode.

Motor control apparatus and control apparatus for hybrid electric vehicles

A controller of a field winding type synchronous motor is provided that can stably output torque even if the d-axis current pulsates by reducing torque pulsation without causing fluctuation in the magnetic flux acting on the torque. A motor control unitperforms control so that a desired torque can be generated from a field winding type motorhaving a field windingon the rotor. Based on a current Id flowing in the d-axis direction out of the current flowing in a stator windingof the field winding type motor, the motor control unitcalculates an induced voltage Vfbeing induced in the field windingand compensates a field voltage Vf of the field winding based on the induced voltage Vf, thus suppressing pulsation of the field current flowing in the field winding of the field winding type motor

Controller of field winding type synchronous motor, electric drive system, electric four wheel driving vehicle, and hybrid automobile

An object of the present invention is to provide a generator control unit having improved voltage response in a system which is not provided with a battery in a DC output unit. In order to control the DC voltage of the DC voltage output terminal in a state where an electric load is connected to the DC voltage output terminal of a power generation unit, a PWM signal generation unitgenerates a field voltage to be applied to a field winding terminal of the power generation unit. A feedback control unitcalculates a field voltage command value to be given to the PWM signal generation unit. Further, the feedback control unitincludes a PT control unitwhich calculates a voltage deviation between a DC voltage detection value and a DC voltage command value to generate the field voltage command value through a PI operation based on the voltage deviation. The feedback control unitincludes compensation unitsandwhich generate a field voltage command value after compensating the output of the PT control unitfor the voltage deviation based on input/output transfer characteristics of the generator from the field voltage to the DC voltage.

Generator control unit

An object of the present invention is to provide a controller for an electric four-wheel-drive vehicle, which is capable of minimizing torque changes and consuming excessive power even when the excessive power is generated by a generator. A motor control unit causes an AC motor to generate desired torque by controlling an inverter. When the power generated by the generator exceeds the power consumed by the inverter and AC motor to generate excessive power, a current command determination unit in the motor control unit consumes the excessive power by increasing a loss in the AC motor.

Controller for an electric four-wheel-drive vehicle

An electric four-wheel drive vehicle and a control unit for the same, which can be applied to cars of class having larger displacements than the class to which the electric four-wheel drive vehicle equipped with the DC motor is applied, without increasing the cost over that of the known mechanical four-wheel drive vehicle. Front wheels of the vehicle are driven by an engine, and rear wheels are driven by an AC motor. A generator is driven by a rotating force of the engine to output DC power. An inverter converts the DC power outputted from the generator to AC power. A control unit controls the generator such that energy Pm required for driving the AC motor is outputted from the generator.

Electric four-wheel drive vehicle and control unit for same

The present invention provides a controller and driving apparatus for an electric vehicle, which enables a motor to steadily output torque even when there is an increase in the rotation speed of an internal combustion engine that drives a generator. A motor control unit includes a voltage/current command generator F. The voltage/current command generator Fincludes a base command determination unit, which determines a base command value for the output voltage of the generator and base command values for d- and q-axis currents that drive an AC motor, and power generation operating point change means, which changes the command values that are output from the base command determination unit. When an operating point of the generator approaches an unstable region where the generator unsteadily operates, the power generation operating point change means changes the generator's operating point to position it within a stable region.

Controller for an electric vehicle and driving apparatus for the electric vehicle

An electric four-wheel drive vehicle includes: an internal combustion engine; a generator for outputting DC electrical power; an inverter for converting DC electrical power, output from the generator, into AC electrical power; and an AC electric motor, which is driven by the inverter, for driving rear wheels. An electric motor controller controls the inverter, the AC electric motor, and the generator, according to torque instructions from a vehicle. Furthermore, in a case that the output of the AC electric motor becomes negative, and excess electrical energy is generated, the electric motor controller controls the current applied to said AC electric motor such that the loss in said AC electric motor exceeds the negative output of said AC electric motor. This enables the AC electric motor to absorb excess electrical energy in the form of thermal loss.

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Hitachinaka, Japan

Kenta Katsuhama