JPH0583997A - Operating method of ac generator for fuel injection type internal-combustion engine - Google Patents

Abstract

PURPOSE:To make it possible to operate an engine even when a battery can not be used by operating a pump motor. CONSTITUTION:A plurality of power generating coils W1, W2 are provided in a generator 1. When a battery 3 can not be used, the generator 1 is operated with the power generating coils W1, W2 connecting them in series. When the battery can be used, the generator is operated with the power generating coils W1, W2 connecting them in parallel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating an alternator mounted on a fuel injection type internal combustion engine.

[0002]

2. Description of the Related Art A fuel injection device for a gasoline engine has an injector having a valve operated by an electromagnet, a fuel pump for supplying fuel to the injector, and a constant pressure (fuel pressure) of fuel supplied to the injector. And a pressure regulator for controlling the valve, and when the fuel injection command is given, the valve of the injector is opened to inject the fuel.

In order to operate this fuel injection device,
It is necessary to drive the fuel pump during operation of the engine to supply fuel to the injector at all times, and in order to start the engine without any trouble, a sufficient amount of fuel must be supplied from the fuel pump even when the engine is started. Need to be discharged. A pump motor for driving the fuel pump is composed of a DC motor, and is driven by a battery charged through a rectification circuit by an AC generator mounted on the engine.

Generally, a power supply device equipped in an internal combustion engine is
It consists of an AC generator driven by the engine and a battery charged by the output of the AC generator through a rectifier circuit. When the engine cannot start up a large output and the engine rotates at a low speed, the battery is discharged from the battery. When the electric power is supplied to the load and the generator generates a sufficient output at the medium speed and the high speed rotation, the output of the generator charges the battery to supply the electric power to the load.

FIG. 8 shows an example of a power supply device used in a fuel injection type internal combustion engine. In the figure, 1'is a magnet type AC generator installed in an internal combustion engine,
This generator has a generator coil W1, and an AC output voltage obtained from the generator coil W1 is input to a rectifier circuit 2 which is composed of diodes D1 and D2 connected in a bridge. A battery 3 is connected between the output terminals of the rectifier circuit 2, and a pump motor 5 is connected to both ends of the battery 3 via switches 4. 6 is a fuel tank, 7 is an injector, and the fuel in the fuel tank 6 is supplied to the injector 7 by a fuel pump driven by a pump motor 5. Reference numeral 8 is a pressure regulator for controlling the pressure (fuel pressure) of the fuel supplied from the fuel pump to the injector 7 at a constant level.
When the fuel pressure becomes excessive, a part of the fuel supplied from the fuel pump is returned to the fuel tank 6 to keep the fuel pressure constant. 9
Is another load connected across the battery.

In some cases, a regulator may be further provided to control the charging voltage of the battery so as not to become excessive. This regulator is composed of, for example, a detector that detects the voltage across the battery and a circuit that limits the voltage applied to the battery when the detection value of the detector exceeds a set value. If the generator is a magnet generator,
As a circuit for limiting the voltage applied to the battery, the generator coil W is used when the voltage across the battery exceeds a set value.
A circuit that shorts 1 is often used. There is also a case where a control rectifier circuit including a thyristor is used as the rectifier circuit 2, and the firing voltage of the thyristor is controlled according to the voltage across the battery to control the voltage applied to the battery. Furthermore, a control element capable of controlling internal resistance such as a transistor is inserted between the rectifier circuit 2 and the battery, and the voltage applied to the battery is controlled by controlling the internal resistance of the control element according to the output voltage. It may be kept below the set value.

[0007]

In the generator shown in FIG. 8, since the voltage induced in the generator coil W1 rises slowly after the generator is started, a sufficient output for driving the load at low speed rotation is obtained. Can not occur. Therefore, in the conventional generator, the load must be driven by the battery when the engine is started or at low speed, and the pump motor is driven when the battery goes up or the battery is removed due to theft or the like. There was a problem that the engine could not be started because it could not be done. In particular, if such a situation occurred in the outboard motor, it would be impossible to return to the port, which was dangerous. In order to solve the above problems, it is possible to increase the capacity of the alternator to the extent that it can drive the load without a battery, but recently, in order to reduce the weight of the engine and save fuel consumption, It is difficult to increase the capacity of the generator because it is required to make the generator as small as possible. An object of the present invention is to provide a method of operating an AC generator for a fuel injection type internal combustion engine, which can normally drive a pump motor even in a state where a battery cannot be used, without using a large-sized generator. is there.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides power generation when an output voltage of an AC generator mounted on a fuel injection type internal combustion engine is supplied to a load including a pump motor of a fuel injection device for an internal combustion engine through a rectification circuit. It relates to the operating method of the machine. In the present invention, a plurality of power generating coils are provided in the AC generator, and the plurality of power generating coils are connected in series or in parallel according to the state of the load side to operate the power generator, so that the engine is running at low speed. The invention described in claim 1 is capable of driving a load including a fuel pump without any trouble from high speed to high speed.
It applies when the load includes a battery,
In the present invention, when the battery is in a state where it can be used normally, the plurality of generating coils are connected in parallel to operate the AC generator, and when the battery is not in a state where it can be used normally (the battery is (Or when the battery is removed), the plurality of magneto coils are connected in series to operate the alternator. The invention described in claims 2 to 4 can be applied regardless of whether or not a battery is provided. In the invention described in claim 2, the load current is determined by determining the magnitude of the load current flowing when the plurality of power generating coils are connected in series and the load current flowing when the plurality of power generating coils are connected in parallel. Operate the alternator by connecting multiple generator coils with the larger connection. In the invention described in claim 3,
When the voltage applied to the load is less than the set value, the load current that flows when multiple generator coils are connected in series and the load current that flows when multiple generator coils are connected in parallel are determined. When multiple generator coils are connected by the connection method with the larger current and the voltage applied to the load exceeds the set value, the multiple generator coils are connected by the connection method with the lower voltage applied to the load. Connect to operate the alternator. In the invention described in claim 4,
Connects multiple generator coils in series by determining the level of the voltage supplied to the load when multiple generator coils are connected in series and the voltage supplied to the load when multiple generator coils are connected in parallel. When both the voltage supplied to the load and the voltage supplied to the load when a plurality of generator coils are connected in parallel between the input terminals of the rectifier circuit are both below the set value, the voltage is supplied to the load. The generator is operated by connecting multiple generator coils according to the connection method with the higher voltage. In addition, if either the voltage supplied to the load when multiple generator coils are connected in series or the voltage supplied to the load when multiple generator coils are connected in parallel exceeds the set value, the voltage is supplied to the load. The generator is operated by connecting a plurality of generator coils according to the connection method with the lower voltage. The rectifier circuit can be commonly provided for a plurality of magneto coils. In this case, switching between the series connection and the parallel connection of the plurality of magneto coils is performed on the input side of the rectifier circuit. In the case of such a configuration, it is necessary that the plurality of magneto coils generate AC outputs of the same phase. Further, the rectifying circuit may be provided for each of the plurality of magneto coils. In this case, a plurality of power generating coils are connected between the input terminals of the corresponding rectifier circuits, and the series connection and the parallel connection of the plurality of power generating coils are switched on the output side of the rectifier circuit. With such a configuration, it does not matter even if the plurality of magneto coils generate AC outputs of different phases.

[0009]

When a plurality of generator coils provided in the AC generator are connected in series, the output voltage can be quickly raised after the generator is started, but the output voltage increase at high speed rotation is suppressed. When a plurality of magneto coils are connected in parallel, the output voltage rises slowly, but the output voltage during high-speed rotation increases. Therefore, if a plurality of generator coils are connected in series, a relatively high output voltage can be obtained even when the engine is started and at low speed. It becomes possible to drive loads including the above, and it is possible to operate the engine even when the battery goes up or when the battery is removed. Further, if a plurality of magneto coils are connected in series, the output voltage rise at high speed is suppressed, so that the voltage applied to the load does not become excessive when the battery is removed. On the other hand, when the battery is connected and can be used normally, connecting a plurality of generator coils in series suppresses the output voltage from rising at high speeds, resulting in insufficient battery charging current. Become a trend. Therefore, when the battery can be used normally, it is better to connect a plurality of magneto coils in parallel in order to suppress a decrease in output at high speed. If a plurality of magneto coils are connected in parallel, the output voltage rises slowly, but at low speeds, the fuel pump can be driven by the battery, so there is no hindrance to the operation of the engine. Further, as in the invention described in claim 2, when the connection of the generator coil is switched so that a large load current always flows, a large current is supplied to the pump motor even at a low speed when the battery cannot be used, and the engine is Can be started, and the electric current necessary for obtaining a predetermined fuel pressure can be supplied to the pump motor at high speed. Therefore, the engine can be operated without any trouble even when the battery cannot be used. Further, when the battery can be used, a sufficient charging current can be supplied to the battery from low speed to high speed. Further claim 3
When the load voltage is equal to or lower than the set value, the generator coil is connected by the connection method in which the large load current flows, and when the load voltage exceeds the set value, the load voltage becomes low. If the generator coil is connected by the other connection method, a sufficient current can be supplied to the pump motor and the battery while preventing an excessive voltage from being applied to the pump motor and the battery. Further, as in the invention described in claim 4, even if the connection of the generator coil is switched based on only the load voltage, the pump motor is prevented from being excessively applied to the battery and the pump motor. And sufficient current can be supplied to the battery. According to the invention described in claim 5, since only one rectifying circuit needs to be provided, the circuit structure can be simplified. Further, according to the invention as set forth in claim 6, since it does not matter even if the phases of the voltages output by the plurality of magneto coils are different, the present invention can be applied regardless of the constitution of the generator. it can.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the configuration of a power supply device used in the operating method of the present invention. In FIG. 1, 1 is a magnet type AC generator mounted on an internal combustion engine, 2 is a full wave rectifier, Battery, 4 is a switch that is closed when the engine is started, 5 is a pump motor, 6 is a fuel tank, 7 is an injector, 8
Is a pressure regulator, and 9 is any other load. Of these, the parts other than the generator 1 are the same as the conventional one described with reference to FIG.

The generator 1 has a plurality of (two in the illustrated example) generating coils W1 and W2, and these generating coils induce a single-phase AC voltage of the same phase in synchronization with the rotation of the engine. The magneto coils W1 and W2 are connected in series or in parallel by the changeover switch 10 and are connected between the input terminals of the rectifier circuit 2. The changeover switch 10 includes movable contacts 10a and 10b which are simultaneously operated, fixed contacts Sa and Pa to which the movable contact 10a is switched and connected, and fixed contacts Sb and Pb to which the movable contact 10b is switched and connected. Sb is a play contact point. One end of the magneto coil W1 is connected to one input terminal of the rectifier circuit 2 and the fixed contact Pa of the changeover switch, and the other end is fixed contact Sa of the changeover switch.
And the movable contact 10b. Generator coil W1
One end of the magneto coil W2 having the same phase as the one end is connected to the movable contact 10a of the changeover switch, and the other end is connected to the other input terminal of the rectifier circuit 2 and the fixed contact Pb. When the movable contacts 10a and 10b of the changeover switch 10 are brought into contact with the fixed contacts Sa and Sb, respectively, the magneto coils W1 and W2 are connected in series between the input terminals of the rectifier circuit 2, and the movable contacts 10a and 10b of the changeover switch are respectively connected. When the fixed contacts Pa and Pb are contacted, the magneto coils W1 and W2
Are connected in parallel between the input terminals of the rectifier circuit 2.

In the magnet type AC power generation, the characteristics of the output voltage V versus the load current I when the two power generation coils W1 and W2 are connected in series are as shown by curves a to e in FIG. Here, the curves a to e have rotational speeds (rpm) of No to N, respectively.
4 (No <N1 <N2 <N3 <N4). Further, the characteristics of the output voltage V vs. the load current I when the two magneto coils W1 and W2 are connected in parallel are as follows:
For the case of o to N4, the curve a'of FIG.
It becomes like ~ e '. Here, No is the starting speed of the engine, and N4 is the maximum operating speed of the engine.

A broken line R shown by a chain line in FIG. 2 is a load line of the pump motor. Until the fuel pressure reaches the set pressure of the pressure regulator 8, the pump motor is in a locked state, so the load resistance of the pump motor shows a value according to the internal resistance of the motor. After the fuel pressure reaches the set value (after the armature current Ir that causes the motor to generate a torque equivalent to the set pressure flows), the pump motor rotates, so that the voltage across the pump motor overcomes its back electromotive force. The voltage rises. Since the fuel pressure is controlled to be constant by the pressure regulator, the armature current of the pump motor is constant (= Ir
) Is held.

Further, in FIG. 2, Ipo represents the armature current of the pump motor when the generator coils W1 and W2 are connected in parallel at the starting speed No, and Iso is the starting speed No.
Shows the armature current of the pump motor when the generator coils W1 and W2 are connected in series and operated. Vp4 is the generator coils W1 and W at the maximum engine speed N4 of the engine.
2 shows the voltage across the pump motor when 2 are connected in parallel. Vs4 is the voltage of the pump motor when the generator coils W1 and W2 are connected in series at the maximum operating speed N4 of the engine. The voltage across both ends is shown. Also I
ch indicates the desired charging current of the battery.

From the characteristics shown in FIG. 2, when the two generator coils W1 and W2 are connected in series to drive the pump motor, the characteristics of the voltage Vs across the motor and the armature current Is with respect to the rotational speed N and the two generators are shown. FIG. 3 shows the characteristics of the voltage Vp across the motor and the armature current Ip with respect to the rotation speed N when the pump motor is operated by connecting the coils W1 and W2 in parallel. From this, the generator coil W
It can be seen that when 1 and W2 are connected in series, the voltage rises faster and the current flowing through the pump motor rises faster. Therefore, when the battery cannot be used, when the generator coils W1 and W2 are connected in series and the generator is operated, a high fuel pressure can be obtained even at a low rotation speed when starting with a recoil starter or the like. It can facilitate starting.

The characteristics of the charging current Isch with respect to the rotation speed N when the battery 3 is charged by connecting the generating coils W1 and W2 in series, and the charging current when the battery is charged by connecting both generating coils in parallel. The characteristics of Ipch with respect to the rotation speed N are shown in FIG. In FIG. 4, VB represents the voltage across the battery 3.

When the engine starts and the number of revolutions increases,
After the armature current of the pump motor reaches the set value Ir,
The voltage rises both when the generator coils W1 and W2 are connected in series and when they are connected in parallel. However, when the engine speed becomes N2 or higher, the voltage becomes higher when the generator coils W1 and W2 are connected in parallel. Becomes higher and the maximum engine speed N
In the vicinity of 4, the voltage is considerably higher when the generator coils are connected in parallel than when they are connected in series. It is not desirable to apply a voltage significantly higher than the rated voltage to the pump motor, so if the battery is not usable and the generator is used to drive the horn motor, the generator coils W1 and W2 should be connected in series. It is better to have it.

On the other hand, when the battery is in a state where it can be used normally, it is necessary to connect the magneto coils W1 and W2 in parallel in order to flow a desired charging current Ich. In this case, the output voltage of the generator is insufficient at low speed, but there is no problem because the fuel pump can be driven by the battery at low speed.

That is, in the embodiment of FIG. 1, when the battery is in a state where it can be used normally, the changeover switch 1
The movable contacts 10a and 10b of 0 are brought into contact with the fixed contacts Pa and Pb to operate the generator with the magneto coils W1 and W2 connected in parallel.

When the battery 3 goes up, the movable contacts 10a and 10b of the changeover switch 10 are brought into contact with the fixed contacts Sa and Sb, respectively, and the generator coils W1 and W2 are connected in series to operate the generator. To do. In this case, it is desirable to disconnect the load 9 from the circuit in order to prevent the load 9 from being supplied with power and running short of the power supplied to the fuel pump.

In the above embodiment, the generator coils W1 and W2 are connected in parallel or in series depending on whether the battery can be used or not. However, by detecting the load current, regardless of the presence or absence of the battery. It is also possible to have a more detailed operation.

FIG. 5 shows the generator coil W by detecting the load current.
The connection of 1 and W2 is switched, and in this example, a changeover switch 10 'composed of an electromagnetic relay is used to change over and connect the magneto coils W1 in series and parallel.
The movable contact and the fixed contact of the relay 10 'are shown by the same reference numerals as the changeover switch of the embodiment of FIG. 1, and when the relay is not excited, the movable contacts 10a and 10b contact the fixed contacts Pa and Pb, respectively. Generator coils W1 and W2
Are connected in parallel. In this example, the current detector 11 is inserted between the rectifier 2 and the load, and the detection output of this current detector is input to the control device 12 that controls the relay 10.

The control device 12 periodically excites the relay for a short time, and the magnitude of the load current flowing when the magneto coils W1 and W2 are connected in parallel (the magnitude of the load current immediately before exciting the relay). And the magnitude of the load current that flows when the generator coils W1 and W2 are connected in series,
Connect the generator coil W1, W depending on the connection method with the larger load current.
The excitation of the relay 10 'is controlled so that 2 is connected.
That is, when the load current when the generator coils W1 and W2 are connected in series is larger than the load current when the generator coils W1 and W2 are connected in parallel, the relay 10 'is excited and its movable contact 10a, 10b are brought into contact with the fixed contacts Sa and Sb, respectively, and the magneto coils W1 and W2 are connected in series. When the load current when the magneto coils W1 and W2 are connected in parallel is larger than the load current when the magneto coils W1 and W2 are connected in series, the relay 1
0'is de-excited so that the movable contacts 10a, 10b are brought into contact with the fixed contacts Pa, Pb, respectively, and the generator coil W1,
Connect W2 in parallel. Thus, the generator coil W1,
Determine the magnitude of the load current when W2 is connected in series and the load current when it is connected in parallel, and connect the generator coil with the connection method with the larger load current to operate the generator. If the battery cannot be used, the armature current Is flows from point A to point B in FIG.
The armature current Ip flows from the point B to the point C, and a sufficient armature current can be supplied to the pump motor to obtain a sufficient fuel pressure even when the engine is started. Further, when the battery is connected, the charging current Isch flows from point D to point E in FIG. 4, and the charging current Ipch from point E to point F.
Therefore, charging can be started at a low rotation speed and a large charging current can flow.

The magnitude of the load current flowing when the magneto coils W1 and W2 are connected in parallel as described above is compared with the magnitude of the load current flowing when the magneto coils W1 and W2 are connected in series. Even when the generator coils W1 and W2 are connected by the connection method with the larger load current to drive the load, it is preferable to disconnect the load 9 from the circuit when the battery cannot be used.

The controller 12 may be composed of a microcomputer or an electronic circuit.

As described above, when the generator coils are actually connected in series or in parallel and the load currents flowing in the series connection and the parallel connection are detected, the same control is performed regardless of the characteristics of the generator. Since the device can be applied, versatility can be provided. However, if the characteristics of the generator are known in advance, for example, the relationship between the number of revolutions of the generator and the load currents in series connection and load current in parallel connection is determined in advance, and the relationship is determined according to the number of revolutions. By controlling the relay by using the relay, the same control as described above can be performed.

FIG. 6 shows still another embodiment of the present invention. In this embodiment, in addition to the configuration of FIG. 5, a voltage detector 13 for detecting the voltage across the load is further provided. The output of the current detector 11 and the output of the voltage detector 13 are input to the control device 12.

In the embodiment of FIG. 6, the controller 12 is
In the same manner as in the embodiment of FIG. 5, the magnitude of the current supplied to the load when the magneto coils W1 and W2 are connected in series and the current flowing through the load when the magneto coils W1 and W2 are connected in parallel are determined. Then, when the voltage applied to the load is below the set value, the generator coils W1 and W2 are connected by the connection method with the larger load current, and when the voltage applied to the load exceeds the set value, the load current is applied to the load. The alternating current generator is operated by connecting the magneto coils W1 and W2 in the connection method of lowering the applied voltage. By controlling in this way, when the battery is in an unusable state, the voltage across the pump motor 5 is set to the set value when the magneto coils W1 and W2 are connected in parallel in the region exceeding point C in FIG. When the voltage exceeds the value (when it becomes excessive), the voltage can be limited by exciting the relay 10 'and connecting the magneto coils W1 and W2 in series. When the battery is ready for use, when the battery is overcharged and the voltage across the battery exceeds the set value, the voltage can be limited by switching the generator coils W1 and W2 to series connection.

In the embodiment of FIG. 6, both the load voltage and the load current are detected to control the switching of the connection of the magneto coils, but it is also possible to control only the load voltage. In this case, when the generator coils W1 and W2 are connected in series, the voltage supplied to the load and the generator coil W1
, W2 are connected in parallel to determine whether the voltage supplied to the load is high or low, and when the generator coils W1 and W2 are connected in series, the voltage supplied to the load and the generator coils W1 and W2 are determined.
If both the voltage supplied to the load and the voltage supplied to the load are less than the set value when connected in parallel, the alternator coils W1 and W2 are connected by the connection method with the higher voltage supplied to the load. The voltage supplied to the load when the generator coils W1 and W2 are connected in series, or the generator coils W1 and W2,
When either of the voltages supplied to the load exceeds the set value when W2 is connected in parallel, the generator coils W1 and W2 are connected according to the connection method with the lower voltage supplied to the load to generate AC power. Drive the machine.

In each of the above embodiments, a rectifier circuit is commonly provided for a plurality of generator coils, and the connection of the generator coils is switched on the input side of the rectifier circuit. However, as shown in FIG. A rectifier circuit may be provided for each power generation coil, and the connection of the power generation coil may be switched on the output side of the rectification circuit. In the embodiment shown in FIG. 7, the generator coil W1 is connected between the input terminals of the rectifier circuit 2 including the diodes D1 to D4, and the generator coil W2 is connected between the input terminals of the rectifier circuit 2'including the diodes D1 'to D4'. Has been done. The positive output terminal of the rectifier circuit 2 is connected to one end of the load, and the fixed contact Sa of the changeover switch (relay is also possible) 10
And the negative output terminal is connected to the fixed contacts Pa and Sb of the changeover switch 10. The positive output terminal of the rectifier circuit 2'is connected to the movable contact 10a of the changeover switch, and the negative output terminal is connected to the other end of the load and the movable contact 10b. The method of switching the changeover switch (or relay) is the same as in the above-described embodiments.

Also in the embodiments of FIGS. 6 and 7, it is preferable to disconnect the load 9 from the circuit when the battery cannot be used.

When the magneto coils W1 and W2 are directly connected in parallel or in series as in the embodiment shown in FIGS. 1, 5 and 6, the magneto coils W1 and W2 are in phase with each other in synchronization with the rotation of the engine. However, when the connection of the magneto coils W1 and W2 is switched on the output side of the rectifier circuit as shown in FIG. 7, the phases of the magneto coils W1 and W2 may be different. ..

In the above embodiment, the generator is provided with two generator coils W1 and W2, but the present invention can be applied to the case where three or more generator coils are provided.

In the above embodiment, the magnet type AC generator is used, but the present invention can be applied to the case of using another AC generator.

In the above embodiment, the manual switching switch or the electromagnetic relay is used as the switch for connecting and connecting the generator coils in series or in parallel, but the semiconductor coil is used to switch the connection of the generator coils. You can also

In order to automatically perform the operation of disconnecting the load 9 from the circuit when the battery is in an unusable state, the load 9 is connected to the circuit via a switch capable of controlling on / off, It is also possible to automatically disconnect the load 9 from the circuit by turning the switch off when the battery becomes unusable.

[0037]

As described above, according to the first aspect of the present invention, when the battery cannot be used, a plurality of magneto coils are connected in series to speed up the voltage rise, and the voltage at the time of high speed becomes excessive. Since the rise is suppressed and multiple generator coils are connected in parallel when the battery is in a usable state so that sufficient charging current can be obtained at high speed, the pump motor can be used even when the battery cannot be used. There is an advantage that the engine can be operated normally and the battery can be charged without trouble when the battery can be used. According to the invention described in claim 2, since the connection of the magneto coils is switched so that a large load current always flows,
When the battery cannot be used, a large current can be supplied to the pump motor even at low speed to enable the engine to start, and at high speed, the current necessary to obtain a predetermined fuel pressure can be supplied to the pump motor. be able to. Therefore, the engine can be operated without any trouble even when the battery cannot be used. Further, when the battery is in a usable state, a sufficient charging current can be supplied to the battery from low speed to high speed. According to the invention described in claim 3, when the load voltage is less than or equal to the set value, the generator coil is connected by a connection method in which a large load current flows, and when the load voltage exceeds the set value, the load voltage is increased. Since the generator coil is connected according to the connection method that lowers the
In addition to the effect obtained by the invention described in claim 2,
In addition, it is possible to prevent an excessive voltage from being applied to the pump motor and the battery. Further, according to the invention described in claim 4, it is possible to supply a sufficient current to the pump motor and the battery while preventing the voltage applied to the battery and the pump motor from becoming excessive. According to the invention described in claim 5, since only one rectifying circuit needs to be provided, the circuit configuration can be simplified. Further, according to the invention described in claim 6, since the phases of the outputs of the plurality of magneto coils may be different,
The present invention can be implemented regardless of the configuration of the generator.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a circuit used in an embodiment of the present invention.

FIG. 2 is a diagram showing an output voltage-current characteristic of a generator used in an example of the present invention.

FIG. 3 is a diagram showing voltage-current characteristics when a pump motor is driven using the generator having the characteristics shown in FIG.

FIG. 4 is a diagram showing voltage-current characteristics when a battery is charged using the generator having the characteristics shown in FIG.

FIG. 5 is a circuit diagram showing a circuit used in another embodiment of the present invention.

FIG. 6 is a circuit diagram showing a circuit used in still another embodiment of the present invention.

FIG. 7 is a circuit diagram showing a circuit used in still another embodiment of the present invention.

FIG. 8 is a circuit diagram showing a circuit used in a conventional operating method.

[Explanation of symbols]

1 ... AC generator, 2, 2 '... rectifier circuit, 3 ... battery,
5 ... Pump motor, 10 ... Changeover switch, 10 '... Relay, 10a, 10b ... Movable contact, Sa, Sb, Pa, P
b ... Fixed contact, W1, W2 ... Generator coil.

Claims (6)

[Claims] 1. A method for operating an AC generator for a fuel injection type internal combustion engine, which supplies an output voltage to a load including a battery and a pump motor of a fuel injection device for an internal combustion engine through a rectifying circuit, wherein a plurality of AC generators are provided in the AC generator. A generator coil is provided, and when the battery is in a state where it can be used normally,
When operating the AC generator by connecting the plurality of magneto coils in parallel, when the battery is not in a state in which it can be normally used,
A method for operating an AC generator for a fuel injection internal combustion engine, comprising operating the AC generator by connecting the plurality of generator coils in series. 2. A method of operating an AC generator for a fuel injection type internal combustion engine, which supplies an output voltage to a load including a pump motor of a fuel injection device for an internal combustion engine through a rectifying circuit, wherein a plurality of generating coils are provided in the AC generator. The size of the load current flowing when the plurality of magneto coils are connected in series and the load current flowing when the plurality of magneto coils are connected in parallel is determined, and the connection with the larger load current is provided. A method for operating an AC generator for a fuel injection type internal combustion engine, characterized in that the AC generator is operated by connecting the plurality of generator coils in this manner. 3. A method of operating an AC generator for a fuel injection type internal combustion engine, which supplies an output voltage to a load including a pump motor of a fuel injection device for an internal combustion engine through a rectifying circuit, wherein a plurality of generating coils are provided in the AC generator. The size of the load current that flows when the plurality of power generating coils are connected in series and the load current that flows when the plurality of power generating coils are connected in parallel is determined, and the voltage applied to the load is When the load current is less than or equal to a set value, the load current is connected to the plurality of magneto coils to connect the plurality of magneto coils to operate the alternator, and when the voltage applied to the load exceeds the set value,
A method of operating an AC generator for a fuel injection type internal combustion engine, comprising: connecting the plurality of magneto coils to operate the AC generator by a connection method that lowers a voltage applied to the load. 4. A method for operating an AC generator for a fuel injection type internal combustion engine, which supplies an output voltage to a load including a pump motor of a fuel injection device for an internal combustion engine through a rectifying circuit, wherein a plurality of magneto coils are provided in the AC generator. Provided, to determine the high and low of the voltage supplied to the load when the plurality of power generating coils are connected in series and the voltage supplied to the load when the plurality of power generating coils are connected in parallel, When the voltage supplied to the load when the plurality of magneto coils are connected in series and the voltage supplied to the load when the plurality of magneto coils are connected in parallel are both set values or less, The load is supplied to the load when the plurality of magneto coils are connected to operate the AC generator by connecting the plurality of magneto coils in a manner in which the voltage supplied to the load is higher. Voltage or a voltage supplied to the load when the plurality of magneto coils are connected in parallel exceeds a set value, the voltage supplied to the load is lower in the connection method. A method for operating an AC generator for a fuel injection type internal combustion engine, characterized in that the generator coil is connected to operate the AC generator. 5. The rectifier circuit is commonly provided for the plurality of power generating coils, and switching between the series connection and the parallel connection of the plurality of power generating coils is performed on an input side of the rectifier circuit. 5. A method for operating an AC generator for a fuel injection type internal combustion engine according to any one of 1 to 4. 6. The rectifier circuit is provided for each of the plurality of power generating coils, and each power generating coil is connected between input terminals of the corresponding rectifier circuit, and the plurality of power generating coils are connected in series and in parallel. 5. The fuel-injection type AC generator for internal combustion engine according to claim 1, wherein switching between and is performed on the output side of a plurality of rectifier circuits respectively corresponding to the plurality of generator coils. Driving method.