Hitachi Astemo Ltd.

Hitachi Automotive Systems, Ltd.

Akihiro Ashida

Toshiyuki Ajima

Takafumi Hara

Hirokazu Matsui

Midori Takaoka

Kiyoshi Kuroda

Hiroshi Tamura

Yoshinori Aoshima

Katsuhiro Hoshino

Kazuto Oyama

Junki Isobe

An inverter control deviceincludes a PWM control unitthat generates a PWM pulse for controlling an inverter, and a pulse edge control unitthat performs pulse edge control for correcting (shifting) a phase of a pulse edge of the PWM pulse generated by the PWM control unit. The PWM control unitgenerates a PWM pulse by using a modulation rate based on a voltage command (Vd*, Vq*). The pulse edge control unitcorrects the PWM pulse so that a phase difference between a zero cross point where the modulation wave changes across 0 and a pulse edge of the PWM pulse falls within a predetermined range.

Inverter control device and electric vehicle system

A deviation between a detection result of an output current of an inverter and an actual current is suppressed. A current detection unitdetects a three-phase AC current output from an inverteror input to the inverter. An inverter control devicecontrols the inverterbased on a current detection value based on a detection result of the three-phase AC current by the current detection unitand a predetermined current command value. The inverter control devicecorrects the current detection value so as to correct a detection error of the three-phase AC current generated due to a delay time of a filterwhich is a filter element provided in the current detection unit

An inverter control deviceincludes a current control unitthat outputs a voltage commands (Vd*, Vq*), a modulation wave control unitthat generates a modulation wave based on the voltage commands (Vd*, Vq*), a pulse generation unitthat generates a PWM pulse for controlling an inverterusing a modulation wave and a carrier wave of a predetermined frequency, and a pulse shift unitthat corrects the phase of the PWM pulse such that the PWM pulse is output in a phase corresponding to a harmonic of a predetermined order of the modulation wave in the near-zero-cross region including the zero-cross point at which the modulation wave changes across 0.

Inverter control device

A random value integration unitoutputs a random value output from a random value generation unitin a diffusion width Rand output from a diffusion width generation unitby a product of an output of the random value generation unitand an output of the diffusion width generation unit. A triangular wave signal generation unitgenerates a triangular wave signal corresponding to a second carrier frequency fcwhich is obtained by adding the random value output from the random value integration unitto a first carrier frequency fcwhich is an output of a carrier frequency setting unit. That is, a frequency obtained by increasing the diffusion width of the first carrier frequency fcis used as the second carrier frequency fc, and the second carrier frequency is used as the carrier frequency.

Motor control device and electric vehicle system

An object of the present invention is to provide a motor control device that can suppress electromagnetic noises including a switching noise and to an electric vehicle system using the motor control device. A motor control device includes: a power converter that is controlled by a pulse width modulation signal; a motor that is driven by the power converter; and a controller that generates the pulse width modulation signal, based on a carrier signal. When switching between a first carrier frequency (fc1) of the carrier signal and a second carrier frequency (fc2) of the carrier signal, the controller varies proportions of the first carrier frequency and the second carrier frequency in accordance with a number of rotations of the motor, the second carrier frequency being higher than the first carrier frequency.

Motor control device and electric vehicle system using the same

This is to reduce electromagnetic noise while reducing a calculation load of a microcomputer. An inverter drive device according to the present invention switches a first control mode, a second control mode, and a third control mode on the basis of vehicle speed information in a motor control device that controls a power converter that drives a polyphase motor by a PWM pulse signal based on a carrier signal, the first control mode being for updating a command voltage signal to the power converter only on a ridge side or a trough side of the carrier signal, the second control mode being for updating a command voltage signal to the power converter both on a ridge side and a trough side of the carrier signal, and the third control mode being for updating a command voltage signal to the power converter only once of ridge-trough-ridge or trough-ridge-trough of the carrier signal.

Inverter drive device and electrically driven vehicle system using the same

An object of the present invention is to reduce output voltage errors of an inverter circuit and stably control a motor until the motor reaches high speed rotation. An inverter device includes a PWM controller that generates a PWM pulse for converting DC voltage to AC voltage in accordance with an output request of a motor, and an inverter circuit that converts the DC voltage to the AC voltage with the PWM pulse generated by the PWM controller and drives a motor. The PWM controller changes the pulse width of the PWM pulse at predetermined timing on the upper side of the trapezoidal wave when the trapezoidal wave modulation using the trapezoidal wave is performed in the overmodulation region.

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Hitachinaka, Japan

Akihiro Ashida