Nippondenso Co., Ltd.

Katsumi Itoh

Kazumasa Mori

Yoshio Akita

Katsuya Muto

Katsutaro Iwaki

Akira Mase

Takayasu Nimura

Keiichiro Banzai

Taro Asahi

Takeshi Nakamoto

Toshio Morishima

Takayasu Minura

A generation control apparatus for vehicles comprises a voltage regulator circuit for controlling the generation of power by a vehicle generator. The power is supplied to the voltage regulator circuit through a first circuit including an ignition switch and a second circuit not including the ignition switch. The supply of power through the second circuit is dependent upon the generating condition of the generator thus allowing the control of the power generation by means of the current flowing through a charge indicator even if the detection of the power generation is prevented. In this way, even if a fault such as a break occurs in the first circuit, the generating operation is maintained until the engine is turned off and the generator has stopped.

Generation control system for vehicles

A voltage control system for vehicles includes a power supply control circuit which allows power to be supplied to a voltage regulator circuit from a battery through a voltage detection line only when a key switch is turned on. The voltage regulator circuit controls the energization of a generator depending on the terminal voltage of the battery detected through the voltage detection line. The power supply control circuit includes a voltage divider circuit for detecting a voltage developed at an output terminal of an auxiliary rectifier associated with the generator when the connection of the output terminal to the battery is completed upon closing the key switch. The power supply control circuit also includes an output transistor controlled by the voltage detected by the voltage divider circuit and when the detected voltage reaches a predetermined level, the output transistor is rendered conductive and allows the supply of power from the battery to the voltage regulator circuit through the voltage detection line.

Voltage control system for vehicles

A power generation control system for a vehicle generator comprises a generator including an armature coil, an exciting coil and a rectifier for rectifying the AC output of the armature coil, a battery, and a voltage control device for controlling the activation of the generator in accordance with the terminal voltage of the battery. This power generation control system further comprises an abnormal voltage detector circuit for detecting the voltage generated across the armature coil and cutting off the current flowing in the exciting coil when said voltage exceeds a predetermined value. The abnormal voltage detector circuit has the function to hold this forcible stoppage of power generation.

Power generation control system for vehicle generator

In a battery charging control system for vehicles having an energization resistor connected to the output terminal of an auxiliary rectifier for the purpose of providing a current path from a battery through a key switch, a warning lamp and the energization resistor to indicate a failure of a generator by the lamp, an energization control circuit is provided to form the current path through the energization resistor only when a voltage developed at the output terminal of the auxiliary rectifier reaches a specified voltage level thus blocking the current path during initial excitation of the field coil of the generator.

Battery charging control system for vehicles

A generation control apparatus for vehicle generator normally controls the energization of the vehicle generator in response to a terminal voltage of a battery which is charged by the generator through a rectifier. The generation control apparatus includes a fault detection circuit to detect an abnormal condition of the terminal voltage of the battery or the output voltage of the generator, and if the abnormal condition is detected, a changeover circuit effects the control of the energization in accordance with the output voltage of the generator instead of the battery terminal voltage.

Generation control apparatus for vehicle generators

A semi-conductor voltage regulation system for a vehicle alternator has a timed signal generating circuit initiated by the engine starter signal. The field exciting current of the alternator is first supplied for a predetermined period after the engine has been started until the alternator is excited to start generation. When the alternator is fully excited, the regulation system operates in the well known manner.

Voltage regulator system for vehicle generator

In a voltage control apparatus for an electric generator (1) for vehicles including an armature winding (3), an exciting coil (4), a rectifier (2) for rectifying an a.c. output from the armature winding, and a voltage regulator (5), the voltage regulator comprises a differential amplifier circuit (26) producing a detected voltage corresponding to a difference between a battery charging voltage and a reference voltage, a comparator circuit (30) comparing the detected voltage with a triangular waveform voltage generated at constant periods and producing a pulsed output voltage, a first driver circuit (51) effecting duty-factor-control of an exciting current flowing through the exciting coil in response to the pulsed output voltage, and an initial excitation circuit (32) for causing a predetermined small initial exciting current to flow through the exciting coil intermittently during a time interval after the start of the electric generator.

Voltage control apparatus for electric generators for vehicles

A semi-conductor voltage regulation system for a vehicle includes engine rise-up detection circuit and an oscillator circuit. The field exciting current is intermittently supplied by the oscillator circuit before the engine starts and continuously supplied after the engine has started so as to minimize battery discharge.

A generator operation indicating apparatus for vehicle generators having a protective circuit against abnormal voltage, includes a drive circuit for turning an indicating device on from the time of closing of a key switch until the time that a vehicle generator attains a predetermined operating condition to indicate the generator operation and a control circuit for forcibly rendering the drive circuit inoperative in response to the occurrence of an abnormal voltage between the indicating device and the drive circuit. When the generator attains the predetermined operating condition, the indicating device is turned off and the supply of current to a load circuit is started. In this case, the drive circuit is also forced to come out of operation upon occurrance of an abnormal supply voltage.

Generator operation indicating apparatus for vehicle generators having a

When an engine key switch of a vehicle is closed, a rotor coil of a three-phase a.c. alternator adapted to charge a vehicle-mounted battery is excited by a first controlling circuit. Even with the closure of the engine key switch, the exciting current is restricted to a predetermined value by a second controlling circuit before the alternator has reached a predetermined operating state. The operating state of the alternator is monitored by detecting a voltage at the neutral point of a stator coil connected in star of the alternator.

Voltage control apparatus for a vehicle-mounted alternator

A semi-conductor voltage regulation system for a vehicle includes engine rise-up detection circuit and an oscillator circuit. The field exciting current is intermittently supplied by the oscillator circuit before the engine starts and continuously supplied after the engine has started so as to minimize battery discharge. The engine rise-up detection circuit changes its input impedance in accordance with the voltage applied thereto, whereby a highly reliable regulator with less heat generation may be obtained.

A generator comprises an output winding connected to input terminals of a full-wave rectifier and a field winding. A resistor and diodes are also connected to the input terminals for supplying voltage to a voltage regulator. The generator, the rectifier and the voltage regulator are assembled together within a generator housing, so that a single conducting wire is sufficient for connecting the generator and a battery. The pole cores of the generator are made of low carbon steel the residual magnetism of which has been increased by a cementation process or by insertion of high carbon steel elements.

Current generating system

A generator has a positive and a negative output terminals across which a battery is connected, and another output terminal for generating an output power earlier than the positive output terminal when the generator begins to generate an output power. A field energizing circuit is connected to the other output terminal and a battery voltage responsive circuit to thereby establish a field excitation when the generator begins to generate the output power at the other output terminal and when the battery voltage is below a predetermined value, whereby the field excitation can be carried out earlier and battery discharge through the field energizing circuit is prevented during the time when the engine is stopped and a key switch remains closed.

Current generating system for motor vehicle

A voltage regulating system is used to regulate the output voltage of an alternating current generator which serves to supply electrical loads on a motor vehicle including a battery. The field winding of the generator is supplied with current through the voltage regulating system operating in a switching mode. The voltage regulating system includes a voltage sensing circuit connected with the battery, a control transistor connected with the voltage sensing circuit for effecting ON-OFF of a field current, and a protection circuit having a PNP transistor and a zener diode connected between an output terminal of the generator and the voltage sensing circuit which becomes operable to effect ON-OFF of the field current when the voltage sensing circuit is disconnected from the battery, whereby the output voltage of the generator is regulated at a lower level than that regulated by the voltage sensing circuit during such a disconnection.

Voltage regulating system

In a voltage regulating system, a protective transistor has its collector connected to a base of a power transistor which controls field current of a battery charging generator and its base connected via voltage dropping element to a collector of a control transistor which controls the power transistor in response to a battery voltage whereby an uncontrolled high voltage which takes place during disconnection of a voltage regulator to a battery is prevented in such a manner that the protective transistor controls the power transistor to cut off the field current.

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Ohbu, Japan

Katsumi Itoh