Hitachi, Ltd.

Hitachi Automotive Engineering Co., Ltd.

Nissan Motor Company Limited

Yuuji Maeda

Keiichi Mashino

Tatsuyuki Yamamoto

Hisaya Shimizu

Yoshinori Fukasaku

Susumu Tajima

Toshiyuki Innami

Keisuke Nishidate

Atsushi Kanke

Naoyuki Takahashi

Shouju Masumoto

Yuzo Kadomukai

Junichi Sakano

Tokihito Suwa

Yozo Nakamura

Katsuji Marumoto

Masahiro Sato

Masahide Sakamoto

Shinji Shirakawa

Satoru Shigeta

Masao Fukushima

Kenichi Nakamura

Masakatsu Fujishita

Akihiro Saito

Yoshiaki Honda

Sakae Hikita

Kei Murakami

Kazutoyo Narita

Shuuichi Kokubun

Satoru Sigeta

Seiichi Kawasaki

Takayuki Ebisawa

Keisuke Mishidate

The power converter for solving the above-described problem has a module section and a drive section for operating the module section. The drive section has a drive circuit. The drive circuit is provided so as to correspond to the first semiconductor element which is one of the semiconductor elements comprising the parallel circuit; wherein drive signals for operating the first semiconductor element are output. The drive signals that are output from the drive circuit are electrically branched and output to a second semiconductor element which is a separate semiconductor element from the first semiconductor element of the semiconductor elements comprising the parallel circuit. As a result, the second semiconductor element receives the branched drive signals and operates in the same manner as the first semiconductor element. Thereby, a motor converter favorable for control large current at a low cost is provided.

Power converter

To provide a vehicle driving apparatus capable of providing a sufficient driving force. A driving high-power generator is driven by an engine. A DC motor is driven directly by energy from the generator. A driving generator output voltage control circuit controls output voltage of the generator in accordance with the demanded driving force from the vehicle to control the motor.

Electric generating system for automobiles and its control method

In order to provide an interface circuit, a power converter using the same and an electric vehicle using the same, wherein this interface circuit ensures improved control reliability without employing a photo-coupler, an interface circuitA transfers control signals to the power transistor in a large-current circuitfrom a small-signal circuitfor driving a power transistor. The interface circuitA has a noise absorberthat electrically absorbs a noise voltage produced between the ground of the small-signal circuitand that of the power transistor. The noise absorbertransfers to the power transistor the control signals generated by the small-signal circuit, without being affected by the noise voltage if produced.

Interface circuit with power converter with interface circuit and electric vehicle with power converter

An electric generating system for automobiles has a primary generator which is driven by an internal combustion engine of an automobile and supplies power to an electric load of the automobile and an electric motor for driving wheels of the automobile which are not driven by the internal combustion engine. A secondary generator is driven by the internal combustion engine and drives the motor. A control unit controls the secondary generator and the electric motor. The control circuit controls the output of the generator according to a driving force requested by the automobile, and the driving force of the electric motor is controlled by the output of the secondary generator.

The present invention provides a vehicle driving apparatus capable of being mounted easily even in a narrow space such as under-floor of the vehicle. The vehicle driving apparatus comprises a first and a second generators driven by an engine for driving front wheels, and a motor driven by receiving a power supply from the second generator to drive rear wheels, the first and second generators being installed in the vicinity of an engine within an engine room, the motor being arranged in the vicinity of a differential gear with which a reduction mechanism is integrated and is positioned substantially in a central part of the rear wheels.

A vehicle alternating-current generator control system comprising a voltage command unit for variably controlling a reference voltage according to the state of an internal combustion engine, and an arithmetic unit for storing the difference between a target generation voltage commanded by the voltage command unit and a battery voltage detected by a voltage detection circuit and adding a voltage corresponding to the voltage difference to a command voltage generated by the voltage command unit.

Vehicle-use alternating current generator control system

A control device for a battery charging AC generator for a motor vehicle including a power transistor connected in series with a field winding of the AC generator for performing switching control of a current flowing through the field winding. A voltage deviation circuit detects a deviation of the battery voltage from a reference voltage; and a PWM signal generating circuit is responsive to a voltage deviation signal from the voltage deviation circuit for turning the power transister on and off a resistor connected in series with the power transistor detects a current flowing through the field winding; and a current limiting circuit generates a turn off signal for the power transistor when the detected current is determined to have exceeded a reference current. A latch circuit operates in response to a clock signal from the PWM signal generating circuit to limit the frequency of turning on and off of the power transistor to below 1 KHz.

Control device for battery charging AC generator used in motor vehicle

Electric generator control for a motor vehicle in which the field current IF provided to the field coil of the generator is variable between two values in response to variations in the load applied to the battery. The output voltage of the battery is compared to a predetermined reference value, and a signal representing the difference is supplied to a voltage divider and to an integrator circuit. The outputs of the voltage divider and the integrator are then provided to respective, comparators. A reference signal provided by a time variable signal generator is supplied to both comparators, the respective outputs of which are connected to the inputs of an AND gate which controls a gating element which in turn controls the field current. In the case of a sudden increase in load applied to the battery, the output of the integrator responds more slowly than the voltage divider, which tracks the difference signal instantaneously, and the operation of the power switch is controlled by the output of the integrator circuit.

Charging generator control for vehicles

A vehicle alternator output rectifier instrument in which mesa structure Zener diodes, formed by diffusion of impurity on a P-type silicon substrate, are used as rectifier elements which are used in rectifier circuits for rectifying an alternate current output of a vehicle alternator. Since the vehicle alternator output rectifier instrument employs the above Zener diodes, this rectifier instrument can endure high temperature circumstances, considerably reduce a reverse leakage current to thereby prevent a battery voltage from being discharged and reduce a radio noise to thereby reduce a bad influence exerted upon an electronic device serving as a load.

Vehicle alternator output rectifier instrument capable of high

A method of reducing vibrations of a car body comprises a step of detection of rough which is irregular combustion in an engine, preferably through monitoring of angular velocity of a crankshaft of the engine, and a step of exerting such external force as will cancel roll vibrations of the engine caused by the rough on an engine block of the engine temporarily after the occurrence of the rough. A magnitude of the force and timing of exerting the force is preferably determined on the basis of a degree of the rough and the angular velocity immediately before the occurrence of the rough.

Method and apparatus for reducing vibrations of car body

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Hitachiota, Japan

Yuuji Maeda