JPS5863085A - Starting device for internal combustion engine - Google Patents

Abstract

PURPOSE:To simplify the constitution of the titled device by using one permanent magnet type rotary machine as a motor for starting an internal combustion engine and an alternating current generator driven by the internal combustion engine. CONSTITUTION:When an internal combustion engine is started, transistors Q1- Q6 are put in continuity sequentially by a control circuit 3 and thereby a permanent magnet type rotary machine 2 is made to operate as a motor for starting the internal combustion engine. After the engine is started, the transistors Q1- Q6 are interrupted and the permanent magnet type rotary machine 2 is made to operate as an alternating current generator. By this constitution, generator equipment can be rationalized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starting device for a DC power supply that is a combination of an internal combustion engine, an alternator, and a storage battery.

As is well known, when the supply of commercial power is interrupted due to some kind of accident such as an emergency or a power outage, the power supply to the load is often covered by the private power supply.

Private power sources usually include a group of storage batteries based on lead-acid batteries,
It is comprised of an inverter for changing this DC power into AC power approximately equivalent to commercial power. However, with this type of private power source, the capacity of the storage battery is not sufficient, so if the power supply from the private power source is extended for a long time, there will be a shortage of power, so separate power generation equipment is required.

Generating equipment for this purpose generally consists of an alternating current generator, an internal combustion engine to drive it, and a direct current motor to start the internal combustion engine. It is also often configured to be powered by a storage battery.

The present invention aims to contribute to the rationalization of power generation equipment, and specifically, by using one permanent magnet type alternating current generator, it can also be used as a direct current motor at the time of startup. It is configured as follows.

Hereinafter, this will be explained based on the illustrated embodiment as follows.

The drawing shows a circuit diagram of a power generation facility according to an embodiment. In the figure, 1 is a storage battery group, and 2 is a three-phase alternating current generator.

Q+ + Q2 + ・Q6 is transistor% DI
+ D2...D6 are diodes, and each diode is connected in parallel between the collector and emitter of each transistor in the opposite direction. Each transistor and diode connected in parallel forms a bridge and is connected to the armature coil of each phase of a three-phase alternator. The anode of the storage battery is connected to the first-phase armature coil of the generator 2 through a terminal ■ through a parallel circuit of a transistor Qll diode D1, and the other end of the coil is connected through a terminal ■ to a transistor Q4. Storage battery 1 via a parallel circuit of diode D4
returns to the cathode. Similarly, the anode of the storage battery 1 is further connected to the terminal ■ via a parallel circuit of a transistor Qa and a diode D3.
connected to the second phase armature coil of generator 2 through
The other end of the coil is connected to transistor Q6 through terminal ■. It is returned to the cathode of the storage battery 1 via a parallel circuit to the diode. Similarly, the anode of the storage battery 1 is a transistor Q5e.
It is connected to the third-phase armature coil of the generator 2 through a terminal ■ through a parallel circuit of a diode D5, and the other end of the coil is connected to a transistor Q2 through a terminal ■. Diode D2
It is returned to the cathode of the storage battery 1 through the parallel circuit of. 3 is a control signal generation circuit, which has control signal output terminals -e
, are connected between the pace and emitter of the transistor Q1, and similarly, the terminals b2-e2, .b6-e5 are connected to the transistor Q2. Q3...Q6 pace-
Connected between emitters.

In the internal combustion engine starting device configured as described above, when starting the internal combustion engine (not shown) using 2 as the electric motor,
In the control circuit 3, -el and b4-e4 are used for outputting VC output signals, and transistor Q+.

If Q4 is made conductive, phase current can flow through the first phase of the motor 2. b3-e3 and b6-e6 in next cycle
By outputting an output signal to b5-65 and making the transistors Qs and Qe conductive, a phase current is obtained in the second phase of the motor 2, and in the next cycle, an output signal is output to b5-65 to turn on the transistor Qs t.
If Qz is made conductive, phase current can flow through the third phase of motor 2. If this is repeated periodically, a rotating magnetic field is generated in the armature coil of the electric motor 2, and since torque is generated, the electric motor 2 is started.

At this time, the rotational speed of the motor 2 can be set arbitrarily by changing the signal period that makes each transistor conductive. The period of this signal can be easily set by normal means in the control circuit 3, for example, from 1 to 5 using the frequency setting volume 4.
Hz. Furthermore, by changing the level of the signal that makes each transistor conductive, the magnitude of the phase current of the motor 2 changes, making it possible to set an arbitrary torque. The level of this signal can be easily set by normal means in the control circuit 3, for example, by using the frequency setting volume 5.
It can be set to about 10. Furthermore, by setting the waveform of the signal that conducts each transistor to a sine wave, square wave, triangular wave, sawtooth wave, tone burst wave, etc., you can improve the conversion efficiency of the motor, reduce torque ripple, and achieve smooth starting. This is something that can be achieved.

Next, after the internal combustion engine is started, the control signal applied to the pace of each transistor is set to zero level, each transistor is placed in a cut-off state, and the electric motor 2 changes to an alternating current generator. At this time, the point at which the electric motor 2 is switched from the DC motor to the AC generator is important for operation. This switching point can be detected by a minute resistor 6 inserted in the cathode circuit of the storage battery and a diode 7 inserted in parallel with the resistor 6 in the direction of flow of the charging current. When starting an internal combustion engine,
That is, when the electric motor 2 operates as an AC motor, a DC voltage is generated across the resistor 6, but after the internal combustion engine has started, that is, when the electric motor 2 operates as an AC generator, the current is bypassed by the diode 7. Therefore, the voltage across resistor 6 becomes zero. By introducing the voltage across this resistor 6 to the control circuit 3, the operating state can be identified and the transistors Q1 to Q6 can be controlled accurately.

As described above, according to the internal combustion engine starting device according to the present invention, one permanent magnet rotating machine 2 can serve both as an electric motor for starting the internal combustion engine and as an alternating current generator driven by the internal combustion engine. The economical effect on equipment configuration is significant. Further, during startup, the semiconductor control circuit can easily perform optimal control of frequency, efficiency, torque ripple, etc.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing one embodiment of the present invention. 1: Storage battery, 2: Permanent magnet type three-phase rotating machine (a-type electric motor and AC generator), 3: Control circuit, Q+,...Q6...: Transistor D1.・D6 ・: Diode. Patent applicant Osaka Generator Co., Ltd.

Claims (1)

[Claims] In a DC power supply device equipped with a storage battery, an internal combustion engine, and a rotating machine, when the internal combustion engine is started, a control signal is sequentially applied to the transistor bridge provided for each phase of the rotating machine to generate an electric motor, while the internal combustion engine is operated. 1. A starting device for an internal combustion engine, characterized in that the output of each phase is separated from a storage battery by a transistor in order to use a medium-rotating machine as an alternating current generator.