Hitachi, Ltd.

Hitachi Automotive Engineering Co., Ltd.

Agency of Industrial Science and Technology

Keishin Matsumoto

Katsuji Marumoto

Tsutomu Omae

Masatoshi Hoshino

Kazuo Tahara

Tsutomu Ohmae

Hiroshi Kimura

Keiichi Mashino

Toshimi Abukawa

Hisatugu Ishikura

Toshiyuki Koterazawa

Toru Tatsuzaki

Shuichi Takamatsu

Minoru Ohsuga

Mitsuru Watabe

Atsushi Kanke

Hirohisa Yamamura

Mitsuyuki Hombu

Ryozo Masaki

Takanori Shibata

Yasushi Sasaki

Toshiaki Okuyama

Shotaro Naito

Minoru Oosuga

Yasuhiro Kamimura

Toshimichi Minowa

Nobuo Kurihara

Kunio Miyashita

Kazuaki Tobari

Matsuo Amano

Mineo Kashiwaya

Akihiro Saito

Yuuji Maeda

Akiteru Ueda

Yuji Maeda

Mitsuyuki Honbu

Sakae Hikita

Naoyuki Takahashi

Yuichi Mori

Shouju Masumoto

Toshio Suzuki

Shuuichi Kokubun

Hiroshisa Yamamura

Nobuo Takamoto

Toshiyuki Koterazaka

Schigeru Kuriyama

Tsutcmu Ohmae

A method is provided for easily avoiding undesirable effects on various physical values due to the change in temperature of a motor for driving a throttle valve without causing secondary problems. A technique is also provided for measuring the temperature of the motor electrically. The method uses a compensation device for correcting the power supply to the motor by detecting the impedance of the motor windings and/or the change in the motor temperature. The temperature of the motor is estimated from the current and voltage to the motor.

Method and apparatus for controlling motor-driven throttle valve, automobile, method of measuring temperature of motor for driving automotive throttle valve, and method of measuring motor temperature

Method and apparatus for motor-driven throttle valve, automobile, method of measuring temperature of motor for driving automotive throttle valve, and method of measuring motor temperature

An apparatus of controlling an electronically controllable throttle valve for car has a sensor for detecting the opening of the throttle valve and a microcomputer. A throttle valve opening command value is delivered in the form of a digital signal under the control of the microcomputer. The digital command value signal is converted into an analog signal and on the basis of the analog signal and a detected throttle opening, a motor connected to the throttle valve is driven to control the opening thereof.

Electronic throttle valve control apparatus

It is an object to improve the opening control resolving power in the case where the opening/closing of a throttle valve is controlled by a motor driven actuator. An additional control signal for finely vibrating the throttle valve is given to the actuator in a specific period until the opening of the throttle valve approaches its target value. Consequently, the throttle valve vibrates finely only as occasion demands. Accordingly, in spite of the fact that the opening of the throttle valve can be controlled with finer control resolving power than ordinary control resolving power, good response can be obtained as a whole.

Throttle valve control apparatus

In a valve control apparatus for an automobile, an H-bridge type chopper main circuit 4 is operated by a control signal PWM from a microcomputer 1 to thereby drive a motor 9 for controlling a throttle valve 10. The power element current from the chopper main circuit 4 is detected by a shunt resistor 5 in the form of a voltage, and the detected voltage is amplified by an amplifier 6 and then taken into the microcomputer 1 through a sample hold circuit 12 and an A/D converter. The sample hold circuit 12 is operated in synchronism with the control signal PWM from the microcomputer 1. Further, the A/D converter is also operated in synchronism with the control signal PWM from the microcomputer 1. The motor 9 is controlled by a throttle valve opening angle command and a throttle valve opening angle signal, and further the motor 9 is controlled by a detected motor current.

Valve control apparatus for an automobile

A charging generator having a self-diagnosis function includes a self-diagnosis circuit, a storage device and an output device. When an anomaly is detected, the charging generator with a self-diagnosis function stores data concerning at least one anomalous condition of the generator and the contents of the anomaly in the storage device, and outputs the anomalous data concerning the generator or the contents of the anomaly, which are stored in the storage device, by inputting a specific signal from the outside.

Charging generator with self-diagnosis function

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

A charging generator for a vehicle including a field winding rotated by the rotation of an engine so as to generate a rotating magnetic field; an armature winding responsive to the rotating magnetic field to generate a current and charge a battery via a rectifier; a comparison circuit for comparing a voltage of the battery or a voltage of the rectifier with a predetermined value; a current control circuit for controlling a field current to be supplied to the field winding on the basis of output of the comparison circuit; a voltage change value detection circuit for detecting a change value in the battery voltage or the rectifier voltage; and a load response control circuit for suppressing a rise in the field current to be supplied to the field winding on the basis of an output of the voltage change value detection circuit.

Charging generator for a vehicle including a circuit for suppressing a

A control device for an electric generator for use with a vehicle engine includes an armature winding (stator) and a field winding (rotor) driven by the vehicle engine. A chopper is provided for controlling the field current of the field winding and a pulse width modulator is provided for controlling the duty cycle of the chopper in response to the operating conditions of the engine. A voltage feedback loop is provided from a normally provided battery which loop incorporates a detector for detecting the actual battery voltage and a comparator for comparing the battery voltage with a predetermined set voltage so that the difference in voltage is rendered to zero. The invention additionally provides a current feedback loop for controlling a deviation between a current command value determining the duty of the chopper and an actual current flowing through the field winding so as to be substantially zero. There is also disclosed means for adaptively modifying the current command signal and means for controlling the current demanded by the field winding to reduce the torque demanded by the generator at times, inter alia, of acceleration and engine knocking.

Control apparatus for electric generator

A charging generator output control system for automobiles is disclosed, in which the field current of the generator is controlled by a chopper, an output voltage of the generator is compared with a predetermined target voltage, the difference therebetween is detected, and the duty factor of an output signal of the chopper is controlled in accordance with the difference while at the same time controlling the frequency of an output signal of the chopper in accordance with the duty factor, thus reducing the difference substantially to zero.

Control system for automotive charging generator

A generator generates two voltage outputs which have different voltage levels. One voltage output from the generator is used for operating a power steering apparatus. Another voltage output from the generator is used for charging a battery which supplies current to other loads.

Motor-driven power steering apparatus

An electric power steering apparatus for a vehicle comprises a steering shaft, an electric motor operable to generate an auxiliary steering force having a magnitude corresponding to a value of electric current supplied thereto, a steering toque sensor for detecting a steering torque applied to the steering shaft, a vehicle weight sensor for detecting a vehicle weight, and a control device. The control device is constituted to increase and decrease the value of electric current to be supplied to the electric motor in accordance with not only the increase and decrease of the value detected by the steering torque sensor but also the increase and decrease of the value detected by the vehicle weight sensor.

Electric power steering apparatus for vehicle

Growing community of inventors

Hitachi, Japan

Katsuji Marumoto