JPH01227868A - Driving equipment for starter motor of vehicle - Google Patents

Abstract

PURPOSE:To reduce the load on a starter motor at the starting time in an equipment which contains a motor driving circuit, a power generating circuit and a regulator circuit by incorporating a power generation interruption circuit which interrupts the operation of a power generating circuit when a motor driving circuit is working. CONSTITUTION:A motor driving circuit 10 feeds the current of a battery 1 to a starter motor 4 via a plurality of switches 3, 6 and 7 and a plurality of relays 8. Using a field coil 12 and a starter coil 12, a power generation circuit 14 generates power when an engine operates. Furthermore, when the voltage of the battery 1 is, for example, lower than the specified value, a regulator circuit 19 applies magnetizing current to the field coil 1 to have the power generation circuit 14 generate power. In such constitution the relays 8 and 9 are connected to the base of a secondary transistor 16 by a lead wire 20 having a diode 21. As a result, a power generation interruption circuit 22 which interrupts the power generation of the power generation circuit 14 at the starting time is configurated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starter motor drive device employed in, for example, a motorcycle, and particularly to a so-called starter motor drive device that is used for starting an engine by driving a generator with the drive device. The present invention relates to a drive device that can reduce torque loss.

[Conventional technology]

Motorcycles are often equipped with a starter motor to start the engine, and this starter motor drive device is
The following configuration is common. That is, a battery that serves as a power source, a motor drive circuit that supplies the battery voltage to the starter motor, a power generation circuit that rotates a generator to generate electricity when the engine is operated, and the power generation circuit when the battery voltage is below a predetermined value. and a regulator circuit that supplies current from the battery to the battery to charge the battery.

[Problem that the invention seeks to solve]

By the way, the starter motor drive device described above is structured so that when the engine is started, the generator is simultaneously driven by cranking the starter motor. Therefore, the power generation circuit generates power not only when the vehicle is running, but also when the engine is started. On the other hand, in recent years, power consumption has increased due to dual headlights and larger electrical components such as directional supports, and in order to compensate for this large amount of power consumption, the generators in the power generation circuit have also increased considerably. The capacity is increasing. Therefore, the cranking torque required of the starter motor is increasing accordingly, and considering the increase in required ranking torque due to recent engines with larger displacements and higher compression, the burden on the starter motor is extremely large. It has become a thing.

In view of the above-mentioned conventional problems, an object of the present invention is to reduce the cranking torque that increases due to the generator.
It is an object of the present invention to provide a drive device for a starter motor for a vehicle that can reduce the burden on the starter motor at the time of starting.

[Means for solving problems]

The present invention includes a power supply, a motor drive circuit that supplies power supply voltage to a starter motor, a power generation circuit that generates power by rotation of a generator caused by engine rotation, and a power supply that charges the power supply with current from the power generation circuit when the power supply voltage is low. A driving device for a starter motor for a vehicle is equipped with a regiator circuit that stops charging when the voltage is high, and is characterized in that a power generation stop circuit is added that stops the operation of the power generation circuit when the motor drive circuit is activated.

Here, the generator of the present invention includes, for example, a three-phase alternating current generator (hereinafter referred to as ACG) composed of a field coil magnetized by battery voltage and a stator coil that takes out the generated alternating voltage, and a permanent magnet. It includes a multipolar magneto (hereinafter referred to as ACM) that is rotated and the resulting change in magnetic flux is extracted as an alternating current voltage using a stator coil.

For example, in the case of an ACG, the above-mentioned power generation stop circuit can be realized by turning off the excitation current of the field coil at the time of starting, and in the case of an AC-, the current from the above-mentioned power generation circuit is connected to the power supply and ground at the time of starting. This can be achieved by ensuring that it does not flow in either direction.

[Effect]

According to the starter motor drive device according to the present invention, since the operation of the power generation circuit is stopped at the time of starting, loss torque due to power generation does not occur (therefore, the cranking torque of the starter motor is reduced accordingly, and the motor The burden of this will be reduced.

- [Example] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an electric circuit diagram for explaining a driving device for a starter motor for a motorcycle according to a first embodiment of the present invention, and this embodiment is an example applicable to an ACG generator.

In the figure, l is a battery that is a power source, 2 is a fuse,
3 is the main switch, 4 is the starter motor, 5 is the starter button, 6.7 is the clutch switch and neutral switch that are turned on when the clutch lever is pulled or in the neutral state, and 8.9 is the relay that is turned on when the power is applied. Yes, each of these switches, relays, etc.
A motor drive circuit 1O is configured to supply current from a battery 1 to a starter motor 4.

11 is a field coil excited by battery voltage, 1
2 is a stator coil that is rotated by the crankshaft and extracts the resulting change in n fluxes as an alternating current voltage; 13 is a rectifier circuit consisting of a plurality of diodes that rectifies the alternating current from the stator coil 12; each of these coils, etc. A power generation circuit 14 is configured to generate power during engine operation.

15 is an NPN type transistor that is turned on when the base voltage is high, and is used to control the excitation current of the field coil 11; 16 is the same NPN type transistor that controls on and off the first transistor; The second transistor 17 is a Zener diode for applying a base voltage to the second transistor 16 when the batch voltage exceeds a predetermined value. Note that 17a and 17b are dividing resistors that determine the voltage to the Zener dihode 17;
15a and 16a are bypass resistors, 18 is a backflow prevention diode, and tea is a resistor. In this way, when the battery voltage is below a predetermined voltage, an excitation current is applied to the field coil 11 to cause the power generation circuit 14 to generate electricity, charging the battery, and when the voltage exceeds a predetermined voltage, the regierator stops power generation. A circuit 19 is configured.

In this embodiment, the above-mentioned 1. 4 wires 20 are connected between the second relay 8°9 and the heath of the second transistor 16.
In addition, a diode 21 is connected to this with the direction of the second transistor in the forward direction, thereby cutting off the current to the field coil 11 at the time of startup and stopping the power generation operation of the power generation circuit I4. A stop circuit 22 is configured.

Next, the effects of this embodiment will be explained.

During normal operation of the engine, the voltage of Pantel I is applied to the first transistor 1 from the main switch 3 through the resistor 18a.
5, the transistor 15 is turned on,
Excitation current from battery l is applied to main switch 3. Field coil 11. flows through the path of the first transistor 15;
Field coil 11 is excited. As a result, an alternating current voltage is taken out from the stator coil 12, which is rectified by the rectifier circuit 13, and as a result, the battery l is charged. On the other hand, the battery voltage is the Zener diode 1
7, this voltage is applied to the base of the second transistor 16, turning it on, which lowers the base voltage of the first transistor 15, turning it off, and the above The exciting current is cut off and power generation is stopped.

Furthermore, when starting the engine, when the starter button 5 is pressed while the clutch lever is pulled or in the neutral state, the first relay 8 is turned on, and then the second relay 9 is also turned on, thereby reducing the battery voltage to the starter motor. 4 is applied, and the engine starts. And at this time,
5. When the battery voltage reaches the starter button. It is also applied to the base of the second transistor 16 via the first relay 8 and the diode 21, which turns on the transistor 16.
As in the case where the battery voltage becomes high, the first transistor 15 is then turned off, the excitation current is cut off, and power generation is stopped.

In this manner, in this embodiment, when the starter button is pressed, the excitation current is cut off and power generation is stopped, so there is no torque loss due to power generation when the engine is started, and the burden on the starter motor 4 can be reduced accordingly. Moreover, in this embodiment, this power generation stop operation is performed using one conductor 20 and one wire.
The structure is extremely simple, and there is almost no problem of increased cost.

FIG. 2 is an electrical circuit diagram showing a second embodiment of the present invention,
This embodiment is an example applied to an ACM generator.

In the figure, the same reference numerals as in FIG.
2, the voltage is taken out as an alternating current voltage, and the rectifier circuit 13 rectifies the voltage.

23.24 is a PNP type charging control brush that turns on when the base voltage is low.1. a second transistor, and when the voltage of battery l is lower than a predetermined voltage, the second transistor 24
turns on the first transistor 23, thereby supplying the generated current to the battery 1.

25 is a PNP type transistor that controls the gate voltage of the thyristor 26 for flowing the generated current to the ground;
This applies a gate voltage to the thyristor 26 to turn it on when the battery voltage becomes higher than a predetermined value. Note that 24a is a dividing resistor that determines the base voltage of the second transistor 24, and 25a is a dividing resistor that determines the base voltage of the second transistor 24.
This is a dividing resistor that determines the base voltage of 5. In this way, when the voltage of battery 1 is low, the generated current is used to
A regulator circuit 19 is configured to charge the current and, when the current is high, release the generated current to the ground and stop charging.

In this embodiment, the gate of the thyristor 26 and
1st. A power generation stop circuit 22 is constructed by connecting the second relays 8 and 9 with a conductive wire 20 and connecting a diode 21 with one direction of the relays in the forward direction.

In this embodiment, during normal operation, when the battery voltage is low, the first transistor 23 is switched to the second transistor 2.
4 and turns on, and the generated current from the power generation circuit 14 is supplied to the battery 1 and other loads 27. When the battery voltage becomes higher than a predetermined voltage, the first transistor 23 is turned off, and the buffer voltage turns on the third transistor 25, turning on the thyristor 26, so that the generated current flows to ground.

On the other hand, when the starter button 5 is pressed and the first relay is turned on, the gate voltage of the thyristor 26 changes to the diode 21. It is turned off by reaching a substantially grounded potential via the first relay 8, and since the second transistor 24 is turned off, m
l) The transistor 23 is also turned off, and as a result, the power generation operation of the power generation circuit 14 is stopped.

In this way, in this embodiment, as in the first embodiment, the operation of the power generation circuit 14 is stopped when the engine is started, and loss torque can be suppressed to that extent, and the starter motor 4
can reduce the burden on Also, this deactivation action is a roar lol
20 and one diode 21.

In addition, in the present invention, loss torque is suppressed by electrically stopping the operation of the generator circuit when the engine is started, but the technical idea of suppressing this loss torque is to mechanically control the rotation of the rotating part of the generator. This can also be achieved by stopping the system automatically. That is, for example, 1! between the stator coil 12 of the first embodiment or the permanent magnet of the second embodiment and the crankshaft. A magnetic clutch is interposed, and this 1 when starting! The above objective can be achieved by blocking the magnetic clutch and preventing the permanent magnet from rotating.

[Effects of the Invention] As described above, according to the starter motor drive device according to the present invention, since the operation of the power generation circuit is stopped when the engine is started, the loss torque required for power generation can be suppressed, and the burden on the starter motor is reduced accordingly. It has the effect of reducing

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of a starter motor drive device according to a first embodiment of the present invention, and FIG. 2 is an electric circuit diagram of a starter motor drive device according to a second embodiment of the present invention. In the figure, 1 is a battery (power supply), 4 is a starter motor, 10 is a motor drive circuit, 14 is a power generation circuit, 19 is a regiator circuit, and 22 is a power generation stop circuit. Patent applicant: Yamaha Motor Co., Ltd., patent attorney Tsutomu Shimoichi

Claims (1)

[Claims] (1) A power supply, a motor drive circuit that supplies the power supply voltage to the starter motor, a power generation circuit that generates electricity by the rotation of the generator due to engine rotation, and when the power supply is below a predetermined voltage, the power supply is powered by the current from the power generation circuit. In the vehicle starter motor drive device, which is equipped with a regulator circuit that charges the vehicle and stops charging when the voltage exceeds a predetermined voltage, a power generation stop circuit is added that stops the operation of the power generation circuit when the motor drive circuit is activated. A driving device for a starter motor for a vehicle, characterized in that: