Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki K.k.

Shiro Iwatani

Keiichi Komurasaki

Hirofumi Watanabe

Kazutoshi Kaneyuki

Yoshiyuki Iwaki

Kazuya Tokugawa

Mitsuharu Morishita

Yutaka Kitamura

Tatsuki Kouwa

Yoshihito Itou

Shinji Nishimura

Kenji Itoh

Masakazu Mori

Katsuhiro Sasaki

Shinji Iwamoto

Kyoji Matsumura

Mitsuaki Nanba

Tsunezi Gouda

Tatsuki Kohwa

The brush abrasion detector is unnecessary to provide any detecting element for detecting limit of abrasion of a brush in the proximity of the brush. The brush abrasion detector includes: a brush located being slidably press-fitted to a slip ring provided at an end portion of a field winding of a generator, and supplying an excitation current from a battery to the field winding; a current detection circuit for detecting a current value flowing through the field winding via the brush; an output voltage detection circuit for detecting an output voltage value from the generator; and a brush abrasion determination circuit for determining abrasion state of the brush based on a current value detected by the current detection circuit or an output voltage value detected by the output voltage detection circuit.

Brush abrasion detector of vehicle generator

A control system for a vehicular generator is provided which can be simplified in construction as the entire system to achieve cost reduction by using only a single control terminal that takes in a control signal from outside and by employing the control signal composed of only three kinds of signals. The system includes a generatorhaving an armature coiland a field coil, a batteryto be charged by a power generation voltage, and a control circuitA that adjusts the power generation voltage by controlling to turn a field current supplied to the field coilon and off in accordance with a battery voltage. A single control terminal C is provided on the control circuitA, and an external control unitis connected to the control terminal C. The external control unitsupplies either one of a ground signal, an open signal and a pull-up signal to the control terminal C as a control signal in accordance with the battery voltage and an operating condition of the vehicle. The control circuitA interrupts the field current to stop power generation in response to the ground signal, adjust the power generation voltage to a first control voltage for normal time in response to the open signal, and adjusts the power generation voltage to a second control voltage higher than the first control voltage in response to the pull-up signal.

System for controlling generator for vehicle

The structure of the present invention includes: a switching element inserted in series in a field coil of an A.C. generator for intermittently controlling a field current supplied to the field coil in accordance with an output voltage from the A.C. generator in order to control the output voltage from the A.C. generator to a predetermined value; and conduction rate control means for detecting a rotational speed of the A.C. generator to reduce a conduction rate of the switching element in accordance with an increase in rotational speed.

Controller of A.C. generator for vehicles

A controller for an A.C. generator for a vehicle, includes: batteries each of which is charged with electric charges on the basis of an output of generation of electrical energy of an A.C. generator having a field coil; voltage regulating means for regulating a current, which is caused to flow through the field coil, on the basis of the detection result of a voltage developed across the terminals the batteries due to an output voltage of the A.C. generator into an fixed output value of the generation of electrical energy of the A.C. generator; and field current restricting means for detecting a current which is caused to flow through the field coil by means of a field current detecting resistor to restrict the current to a predetermined value in correspondence with the detection result, wherein the field current detecting resistor is formed as a thick film printed resistor, and wherein each of the means other than the thick film printed resistor is formed by an electronic circuit are in the form of an integrated circuit.

Automotive dynamo controller

An AC generator control apparatus for automobiles includes a car battery charged by the rectified output from an AC generator for automobiles; a voltage regulator circuit for intermittently controlling the exciting current flowing through the field coil of the AC generator and adjusting the generated output voltage into a set value; and a set signal output unit for outputting to the voltage regulator circuit an output voltage value set signal of the AC generator depending on the detection results of various operation states of automobiles. The voltage regulator circuit includes a set value switching means for switching and setting a value of an output voltage of the AC generator depending on the contents of the set signal input from the set signal output unit; an output voltage detection means for detecting the output voltage of the AC generator; and an exciting current control means for intermittently controlling the exciting current depending on the comparison result between the set values of the detected output voltage and the output voltage of the AC generator.

Controller of AC generator for use in vehicles

A vehicle AC-generator controller includes a storage battery to be charged by a rectification output of an AC generator having a field coil, a voltage regulator for controlling an output voltage of the AC generator to a predetermined value by controlling a field current flowing through the field coil, an indicator lamp for indicating a power-generation state and a no-power generation state of the AC generator, an indicator-lamp driving element for turning on and off the indicator lamp, a power-supply driving element for driving power supply of the voltage regulator in accordance with a turn-on-lamp output of the indicator-lamp driving element, and a power-supply cutoff element for cutting off the power-supply driving apparatus by controlling the turn-on-lamp output to the ground potential when the AC generator is brought into the no-power-generation state.

Controller AC generator for vehicle

In order to make the output voltage of the alternating current generator to be controllable even when a malfunction is produced on the negative electrode side of the magnetic field coil, the voltage control circuit for controlling the output voltage of the alternating current generator is provided on the negative electrode side of the magnetic field coil of the alternating current generator for charging a battery and, on the positive electrode side of the same, the overvoltage protection circuit for controlling the output voltage of the alternating current generator is provided.

Control system for an alternating current generator

An arrangement including an AC generator,whose output voltage is regulated with a control quantity for a field current flowing through a field coil,of the AC generator, a switching element 308 for performing on/off-control of the field current flowing through the field coil,with a predetermined duty ratio, a voltage detecting means,for detecting an output voltage of the AC generator,and a gradually increasing control means,A for increasing gradually a conducting rate by increasing gradually the duty ratio in dependence on the detected output voltage, and a rotation speed detecting means,for detecting a rotation speed of the generator,wherein the gradually increasing control means,A is designed to increase the gradually increasing rate of the duty ratio in conformance with increasing of the rotation speed detected by the rotation speed detecting means

Control apparatus for vehicle AC generator

An alarm apparatus for a vehicle-onboard AC generator has an alarm function improved owing to detection of both output voltages of a pair of armature coils of the generator. The alarm apparatus includes an AC generator (1) driven by an engine of a motor vehicle and including a field coil (10) and a pair of armature coils (11, 12), a pair of rectifier circuits (21, 22; 21A, 22A) for rectifying output voltages generated by the paired armature coils (11, 12), respectively, a battery (5) charged by rectified outputs of the paired rectifier circuits (21, 22; 21A, 22A), a voltage regulator (3) for regulating the output voltages of the paired armature coils (11, 12) on the basis of either rectified output voltages of the rectifier circuits (21, 22; 21A, 22A) or a terminal voltage of the battery (5), and an alarm means (4A, 49) for generating an alarm when at least one of the output voltages of the paired armature coils (11, 12) deviates from a predetermined value (VR2).

Alarm apparatus for vehicle-onboard AC generator

Only when it is detected by a frequency/voltage converter that the frequency of the phase output of an AC generator is higher than a predetermined frequency, a smoothing capacitor is charged. Therefore, the charging of the smoothing capacitor is prevented at the time of a generation stop.

Controller for car generator

The startability of an internal combustion engine at low temperatures is improved and the revolution stability of the internal combustion engine right after start-up is increased by setting the predetermined maximum value of field current to a low level at low temperatures and to a high level at high temperatures by field current limit setting means.

A control apparatus for an onboard AC generator for a motor vehicle is capable of suppressing erroneous operation of the switching circuit due to a leakage current to thereby prevent the output voltage of the AC generator from abnormal rising. The control apparatus includes an AC generator (1) including a field winding (102), a rectifier circuit (2) for converting an output voltage of the AC generator (1) into a DC voltage, a battery (5) charged with the DC voltage, a switching circuit (3) constituted by a low-side switch for turning on/off a current flow loop extending through the field winding (102), a control unit (4) for controlling on/off-operation of the switching circuit (3) so that a voltage (VB) appearing at a charging terminal of the battery (5) matches with a predetermined voltage level, and a resistor (303) inserted between a control input terminal of the switching circuit (3) and the ground potential.

Control apparatus for onboard AC generator for motor vehicle

A vehicle generator controller comprises a voltage detection circuit for outputting a voltage detection signal D to regulate a generated voltage VG in accordance with a battery voltage VB, a gradual increase control circuit for outputting a gradual increase control signal E in response to the voltage detection signal D and a switching element for intermittently controlling a field voltage in response to the gradual increase control signal E, the gradual increase control circuit includes a smoothing circuit for smoothing the voltage detection signal D by a charging time constant and a discharging time constant and a comparator for outputting the gradual increase control signal E by comparing the smoothing signal with a triangle voltage, both the charging time constant and the discharging time constant of the smoothing circuit are set to one second or more and the gradual increase control signal E moves to a waveform for gradually decreasing the field voltage when the battery voltage increases. With this arrangement, the vehicle generator controller suppresses a torque shock when an electric load is turned on as well as suppresses the drop of a battery voltage when the electric load is repeatedly turned on.

Vehicle generator controller

A rectifier excellent in terms of heat sink performance, product quality, and cost including a one-way conducting device for rectifying an alternating current, wherein the one-way conducting device includes a metal base serving as one electrode and having a side surface portion and a seating surface portion; and a metal heat dissipation member, including a socket section for receiving the metal base, for dissipating heat generated at the one-way conductive device, wherein the socket section of the metal heat dissipation member has a side wall portion firmly engaged with the side surface portion of the metal base and a bottom portion in contact with the seating surface portion of the metal base.

Rectifier heat dissipation

A control apparatus for an AC generator of a motor vehicle of high reliability having substantially no adverse influence to an onboard battery and an onboard high-voltage load by suppressing to a passible minimum variation of a regulating voltage which may occur as contacts of a detection voltage change-over switch are degraded. An AC generator of a motor vehicle includes a rectifier circuit for rectifying an output of the AC generator including a field coil, an output change-over switch for changing over an output of the rectifier circuit to either one of a battery and a high-voltage electric load mounted on the motor vehicle, and a voltage regulator for regulating an exciting current supplied to the field coil in dependence on a terminal voltage of the battery as detected on a charging line connected to the battery by way of the output change-over switch upon charging of the battery from the output of the rectifier circuit, to thereby regulate the output voltage of the AC generator.

Growing community of inventors

Tokyo, Japan

Shiro Iwatani