Hitachi, Ltd.

Hitachi Automotive Eng. Co., Ltd.

Keigo Naoi

Minoru Ohsuga

Toshiharu Nogi

Ryoso Masaki

Makoto Shioya

Toshiaki Okuyama

Kazuo Tahara

Sanshiro Obara

Keiichi Mashino

Yoshiyuki Tanabe

Tsutomu Ohmae

Akihiro Saito

Jun'ichi Yamaguchi

Kunio Kobayashi

Masayuki Shizuka

The present invention relates to a control circuit for use in an internal combustion engine having a cranking device and an air pump driven by a starter motor. The control circuit comprises a first circuit for supplying a power to the starter motor and the cranking device, a second circuit for terminating power supply for the cranking device with maintaining power supply for the starter motor, and a control unit for selectively switching between the first and second circuits.

Method and system for controlling internal combustion engine with air

A control apparatus of a motor drive vehicle includes a unit for generating a target vehicle speed; a speed instruction unit for generating a target motor rotational speed of the motor based upon a preset motor control pattern in response to the target vehicle speed; a power circuit for operating the motor at the target motor rotational speed upon receipt of the target motor rotational speed; a variable transmission unit for converting a drive output from the motor into a transmission ratio for instructing a rotational speed of the drive output, and transferring the converted transmission ratio to a drive shaft of the motor drive vehicle; and a transmission ratio calculating unit for determining the transmission gear ratio based on the target vehicle speed and the target motor rotational speed thereby to instruct the determined transmission gear ratio to the variable transmission unit. A control method sets a target vehicle speed value; produces a target motor rotational speed based upon the target vehicle speed value and a preset motor control pattern; operates the motor at the target motor rotational speed; determines a transmission gear ratio based upon both of the target vehicle speed and the target motor rotational speed; and converts a rotational speed of a drive output into the transmission ratio and transfers the converted transmission ratio to a drive shaft.

Control apparatus and control method for motor drive vehicle

A voltage regulator for a generator wherein a switching device connected in series to the field coil of the generator is adapted to be controlled in accordance with an output voltage of the generator and the ambient temperature at the voltage regulator so as not to exceed the junction temperature limit value of the switching means.

Voltage regulator for generator

A voltage regulator for a charging generator comprising an a.c. generator, a rectifier for converting the a.c. output of the a.c. generator to a d.c., a battery connected to the output of the rectifier, comparison means for comparing the battery voltage with a reference voltage of a reference voltage generation circuit and a power transistor controlled by the output of the comparison means and controlling a current flowing through a field coil of the a.c. generator. The reference voltage generation circuit comprises a voltage divider connected to a constant voltage power source and providing its divided voltage as the reference voltage, a plurality of transistors connected in parallel with a part of the voltage divider, and conduction control means for controlling the transistor in accordance with the ambient temperature so that the reference voltage is determined in accordance with the ambient temperature.

Voltage regulator for charging generator

There is disclosed a rectifier assembly for an AC generator for use with vehicles. The rectifier assembly comprises a single horseshoe heat radiating plate and electric circuit elements mounted thereon, and including at least one rectifier unit and two DC output conductor plates. The two d.c. output conductor plates are disposed in spaced relationship on one surface of the heat radiating plate with an intermediate insulating layer and electrically connected to output terminals of the rectifier unit. The assembly may be incorporated with a voltage regulator of an integrated circuit configuration for controlling the output voltage of the AC generator and a brush holder. The voltage regulator may be coplanar with the conductor plates.

Rectifier assembly for AC generators for use with vehicles

Growing community of inventors

Katsuta, Japan

Keigo Naoi