Power supply control circuit of engine electronic fuel injection system and general engine

Abstract

The utility model discloses a power supply control circuit of an electronic fuel injection system of an engine and a general engine, the power supply control circuit comprises a voltage regulator, a power supply control module, a battery module, a switch module and a power supply port, the voltage output end of a magneto is connected with the voltage input end of the voltage regulator; the voltage output end of the voltage regulator, the switch module and the negative electrode of the battery module are connected with the power supply control module, the voltage output end of the voltage regulator and the positive electrode of the battery module are connected with the power supply port, and the power supply port is used for being connected with the power input end of the electronic fuel injection system so as to supply power to the electronic fuel injection system. When the magnetor outputs voltage, the power supply control module controls the battery module to supply power to the electronic fuel injection system, when the magnetor outputs voltage, the power supply control module controls the battery module to be disconnected, power is directly supplied to the electronic fuel injection system through the magnetor, and the magnetor does not charge the battery module. The starting performance of the manual starting general electronic fuel injection engine can be effectively improved with low cost.

Description

Technical Field

[0001] The present application belongs to the technical field of general electronic fuel injection engine starting control, and in particular, relates to a power supply control circuit of an engine electronic fuel injection system and a general engine. Background Art

[0002] At present, the starting of general-purpose engines is generally achieved through electric starting or manual starting. The electric starting of a general-purpose engine is to connect a battery to the general-purpose engine with a cable, and operate a start switch or a start button to drive the battery to drive the starter motor on the general-purpose engine to rotate, and the starter motor then drives the flywheel to rotate to start the general-purpose engine. The manual starting of a general-purpose engine is to pull a pull cord to drive the winding wheel connected to the pull cord, and then drive the pawl disk assembly connected to the flywheel, so as to rotate the flywheel to start the general-purpose engine.

[0003] After general engines use electronic fuel injection technology, the electric start and manual start of the engine usually need to be connected to a battery, and the battery is used to power the electronic fuel injection system. However, in the current manual start scheme that uses a battery to power the electronic fuel injection system, during the engine start process, the battery is used to power the electronic fuel injection system. After the engine starts, the engine drives the magneto to generate electricity to charge the battery, and the battery continues to power the electronic fuel injection system. Such a scheme requires the use of a large-capacity rechargeable battery (such as a lead-acid battery), and the battery cost is relatively high.

[0004] Some hand-started general-purpose electronic fuel injection engines do not need to be connected to a battery. During the hand-start process, the magneto installed on the engine is driven to rotate and generate electricity to directly provide sufficient power for the electronic fuel injection system to assist in starting. However, the current battery-free hand-start solution for general-purpose electronic fuel injection engines is limited by the performance of the magneto installed on the general-purpose electronic fuel injection engine, and the consistency of the number of starts is poor. At the same time, there are certain requirements on the speed at which the user pulls the pull rope.

[0005] Therefore, how to effectively improve the starting performance of a hand-started general electronic fuel injection engine at a lower cost is a problem that needs to be solved urgently in the current field. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of this application is to provide a power supply control circuit of an engine electronic fuel injection system and a universal engine, which can effectively improve the starting performance of a hand-start universal electronic fuel injection engine at a relatively low cost.

[0007] In order to achieve the above objectives, this application provides the following solutions:

[0008] According to a first aspect of the present application, the present application provides a power supply control circuit of an engine electronic fuel injection system, wherein a magnetic motor is installed on the engine, and the power supply control circuit comprises a voltage regulator, a power supply control module, a battery module, a switch module and a power supply port.

[0009] The voltage output end of the magnetic motor is connected to the voltage input end of the voltage regulator, the voltage output end of the voltage regulator, the switch module and the negative electrode of the battery module are respectively connected to the power supply control module, the voltage output end of the voltage regulator and the positive electrode of the battery module are connected to the power supply port, and the power supply port is used to connect the power input end of the electronic fuel injection system to supply power to the electronic fuel injection system.

[0010] in,

[0011] When the switch module is closed and there is no voltage output at the voltage output terminal of the magnetic motor, the power supply control module controls the battery module to supply power to the electronic fuel injection system;

[0012] When the switch module is closed and the voltage output terminal of the magnetic motor has a voltage output, the power supply control module switches the power supply of the electronic fuel injection system from the battery module to the magnetic motor.

[0013] Preferably, the power supply control module is an electronic switch, the voltage output end of the voltage regulator is connected to the input circuit of the electronic switch, one end of the output circuit of the electronic switch is connected to the switch module, and the other end is connected to the negative electrode of the battery module, wherein:

[0014] When the switch module is closed and there is no voltage output at the voltage output terminal of the magnetic motor, the output loop of the electronic switch is closed, so that the battery module can supply power to the electronic fuel injection system;

[0015] When the switch module is closed and there is voltage output at the voltage output end of the magnetic motor, the output circuit of the electronic switch is disconnected, so that the power supply circuit of the battery module for the electronic fuel injection system of the generator is disconnected, so as to switch the power supply of the electronic fuel injection system from the battery module to the magnetic motor.

[0016] Preferably, the electronic switch is a relay, one end of the coil of the relay is connected to the voltage output end of the magnetic motor, and the other end is grounded, one end of the normally closed contact of the relay is grounded through the switch module, and the other end is connected to the negative pole of the battery module.

[0017] Preferably, the power supply control module is an electronic switch, the voltage output end of the voltage regulator is connected to the input circuit of the electronic switch, one end of the output circuit of the electronic switch is grounded, and the other end is connected to the negative electrode of the battery module through the switch module, wherein:

[0018] When the switch module is closed and there is no voltage output at the voltage output terminal of the magnetic motor, the output circuit of the electronic switch is closed, so that the battery module can supply power to the electronic fuel injection system;

[0019] When the switch module is closed and there is voltage output at the voltage output end of the magnetic motor, the output circuit of the electronic switch is disconnected, so that the power supply circuit of the battery module for the electronic fuel injection system of the generator is disconnected, so as to switch the power supply of the electronic fuel injection system from the battery module to the magnetic motor.

[0020] Preferably, the electronic switch is a relay, one end of the coil of the relay is connected to the voltage output end of the magnetic motor, and the other end is grounded, one end of the normally closed contact of the relay is grounded, and the other end is connected to the negative pole of the battery module through the switch module.

[0021] Preferably, a diode is connected between the power supply port and a connection point between the voltage output end of the voltage regulator and the power supply control module.

[0022] Preferably, the diode is a Schottky diode.

[0023] Preferably, the battery module is an alkaline battery or a nickel-metal hydride battery.

[0024] Preferably, the switch module is a power switch provided by the engine.

[0025] According to a second aspect of the present application, the present application provides a general engine, comprising a power supply control circuit of an engine electronic fuel injection system as described in any one of the first aspects above.

[0026] Due to the adoption of the above technical solution, this application has the following beneficial effects:

[0027] The present application forms a power supply control circuit for the engine electronic fuel injection system by setting a voltage regulator, a power supply control module, a battery module, a switch module and a power supply port. The connection and disconnection between the negative electrode of the battery module and the electronic fuel injection system are controlled by the power supply control module. Before the engine is started, the voltage regulator has no voltage output, and the battery module is used to power the electronic fuel injection system. After the engine is started, the power supply circuit of the battery module is disconnected, and the voltage regulator is used to directly power the electronic fuel injection system, and the voltage regulator is prevented from charging the battery module during the operation of the engine. This allows the battery module to use ordinary small-capacity batteries to meet the needs, thereby effectively improving the starting performance of a hand-started general electronic fuel injection engine at a lower cost.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation of the present application or the technical solution in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation or the prior art description. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of a power supply control circuit of an engine electronic fuel injection system in one embodiment of the present application;

[0031] Figure 2 It is a structural schematic diagram of a power supply control circuit of an engine electronic fuel injection system in another embodiment of the present application. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0033] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined.

[0034] In this application, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] like Figure 1-2 As shown, the embodiment of the present application provides a power supply control circuit of an engine electronic fuel injection system, a magnetic motor 100 is installed on the engine, and the power supply control circuit includes a voltage regulator 1, a power supply control module 2, a battery module 3, a switch module 4 and a power supply port 5.

[0037] The voltage output end of the magneto 100 is connected to the voltage input end of the voltage regulator 1, the voltage output end of the voltage regulator 1, the switch module 4 and the negative pole of the battery module 3 are respectively connected to the power supply control module 2, the voltage output end of the voltage regulator 1 and the positive pole of the battery module 3 are connected to the power supply port 5, the power supply port 5 is used to connect the power input end of the electronic fuel injection system 200 to supply power to the electronic fuel injection system 200, the voltage regulator 1 automatically adjusts the output voltage of the magneto 100, and converts the AC voltage output by the magneto 100 that changes with the engine speed into the desired DC voltage to supply power to the power supply control module 2 and the electronic fuel injection system 200.

[0038] Specifically, when the switch module 4 is closed and there is no voltage output at the voltage output terminal of the magnetic motor 100, the power supply control module 2 controls the battery module 3 to supply power to the electronic fuel injection system 200;

[0039] When the switch module 4 is closed and the voltage output terminal of the magnetic motor 100 has a voltage output, the power supply control module 2 switches the power supply of the electronic fuel injection system 200 from the battery module 3 to the magnetic motor 100 .

[0040] The working principle of the power supply control circuit of the engine electronic fuel injection system 200 in this embodiment is as follows:

[0041] When the switch module 4 is disconnected, the engine cannot be started. When the switch module 4 is closed, when the engine manual start is not involved, the engine has no speed, and at this time the magneto 100 has no voltage output, then the power supply control module 2 controls the battery module 3 to supply power to the electronic fuel injection system 200, and the electronic fuel injection system 200 starts and starts working; during the process of the engine manual start and after the engine start, the engine has a speed, and at this time the magneto 100 has a voltage output, then the power supply control module 2 switches the power supply of the electronic fuel injection system 200 from the battery module 3 to the magneto 100, and the battery module 3 no longer forms a loop with the electronic fuel injection system 200.

[0042] In this embodiment, a power supply control circuit of the engine electronic fuel injection system 200 is formed by setting a voltage regulator 1, a power supply control module 2, a battery module 3, a switch module 4 and a power supply port 5. The connection and disconnection of the battery module 3 and the electronic fuel injection system 200 are controlled by the power supply control module 2. Before the engine is started, the voltage regulator 1 has no voltage output, and the battery module 3 is used to power the electronic fuel injection system 200. After the engine is started, the power supply circuit of the battery module 3 is disconnected, and the voltage regulator 1 is used to directly power the electronic fuel injection system 200, and the voltage regulator 1 is prevented from charging the battery module 3 during the operation of the engine. This allows the battery module 3 to use an ordinary small-capacity battery to meet the demand, thereby effectively improving the starting performance of the hand-started general electronic fuel injection engine at a lower cost.

[0043] like Figure 1 As shown, in one embodiment, the power supply control module 2 is an electronic switch, the voltage output end of the voltage regulator 1 is connected to the input circuit of the electronic switch, one end of the output circuit of the electronic switch is connected to the switch module 4, and the other end is connected to the negative electrode of the battery module 3, wherein,

[0044] When the switch module 4 is closed and there is no voltage output at the voltage output terminal of the magnetic motor 100, the output loop of the electronic switch is closed, so that the battery module 3 can supply power to the electronic fuel injection system 200;

[0045] When the switch module 4 is closed and there is voltage output at the voltage output end of the magnetic motor 100, the output circuit of the electronic switch is disconnected, so that the power supply circuit of the battery module 3 for the electronic fuel injection system 200 of the generator is disconnected, so as to switch the power supply of the electronic fuel injection system 200 from the battery module 3 to the magnetic motor 100.

[0046] In this embodiment, when the switch module 4 is disconnected, the engine cannot be started. When the switch module 4 is closed, the engine has no speed when the manual start of the engine is not involved. At this time, the magneto 100 has no voltage output, and the output circuit of the electronic switch is closed. Then the circuit formed by the switch module 4, the output circuit of the electronic switch, the battery module 3 and the electronic fuel injection system 200 is closed. At this time, the battery module 3 supplies power to the electronic fuel injection system 200, and the electronic fuel injection system 200 starts and starts working; during the manual start of the engine and after the engine is started, the engine has a speed, and at this time the magneto 100 has a voltage output, then the output circuit of the electronic switch is disconnected, then the circuit formed by the switch module 4, the output circuit of the electronic switch, the battery module 3 and the electronic fuel injection system 200 is disconnected, and at this time, the power supply of the electronic fuel injection system 200 is switched from the battery module 3 to the magneto 100, and the voltage regulator 1 converts the AC voltage output by the magneto 100 that changes with the engine speed into the desired DC voltage to supply power to the electronic fuel injection system 200, and the battery module 3 no longer forms a circuit with the electronic fuel injection system 200.

[0047] Specifically, Figure 1 As shown, in one embodiment, based on the previous embodiment, the electronic switch is a relay, one end of the coil of the relay is connected to the voltage output end of the magnetic motor 100, and the other end is grounded, one end of the normally closed contact of the relay is grounded through the switch module 4, and the other end is connected to the negative pole of the battery module 3.

[0048] In this embodiment, when the switch module 4 is disconnected, the engine cannot be started. When the switch module 4 is closed, the engine has no speed when the manual start of the engine is not involved. At this time, the magneto 100 has no voltage output, the coil of the relay is not energized, and the normally closed contact of the relay is closed, then the circuit formed by the switch module 4, the normally closed contact of the relay, the battery module 3 and the electronic fuel injection system 200 is closed, and at this time the battery module 3 supplies power to the electronic fuel injection system 200, and the electronic fuel injection system 200 starts and starts to work; during the manual start of the engine and after the engine is started, the engine has a speed, at this time the magneto 100 has a voltage output, the coil of the relay is energized, and the normally closed contact of the relay is disconnected, then the circuit formed by the switch module 4, the normally closed contact of the relay, the battery module 3 and the electronic fuel injection system 200 is disconnected, and at this time the power supply of the electronic fuel injection system 200 is switched from the battery module 3 to the magneto 100, and the voltage regulator 1 converts the AC voltage output by the magneto 100 that changes with the engine speed into the desired DC voltage to supply power to the electronic fuel injection system 200, and the battery module 3 no longer forms a circuit with the electronic fuel injection system 200.

[0049] like Figure 2 As shown, in one embodiment, the power supply control module 2 is an electronic switch, the voltage output end of the voltage regulator 1 is connected to the input circuit of the electronic switch, one end of the output circuit of the electronic switch is grounded, and the other end is connected to the negative electrode of the battery module 3 through the switch module 4, wherein,

[0050] When the switch module 4 is closed and there is no voltage output at the voltage output terminal of the magnetic motor 100, the output loop of the electronic switch is closed, so that the battery module 3 can supply power to the electronic fuel injection system 200;

[0051] When the switch module 4 is closed and there is voltage output at the voltage output end of the magnetic motor 100, the output circuit of the electronic switch is disconnected, so that the power supply circuit of the battery module 3 for the electronic fuel injection system 200 of the generator is disconnected, so as to switch the power supply of the electronic fuel injection system 200 from the battery module 3 to the magnetic motor 100.

[0052] In this embodiment, when the switch module 4 is disconnected, the engine cannot be started. When the switch module 4 is closed, the engine has no speed when the manual start of the engine is not involved. At this time, the magneto 100 has no voltage output, and the output circuit of the electronic switch is closed. Then the circuit formed by the switch module 4, the output circuit of the electronic switch, the battery module 3 and the electronic fuel injection system 200 is closed. At this time, the battery module 3 supplies power to the electronic fuel injection system 200, and the electronic fuel injection system 200 starts and starts working; during the manual start of the engine and after the engine is started, the engine has a speed, and at this time the magneto 100 has a voltage output, then the output circuit of the electronic switch is disconnected, then the circuit formed by the switch module 4, the output circuit of the electronic switch, the battery module 3 and the electronic fuel injection system 200 is disconnected, and at this time, the power supply of the electronic fuel injection system 200 is switched from the battery module 3 to the magneto 100, and the voltage regulator 1 converts the AC voltage output by the magneto 100 that changes with the engine speed into the desired DC voltage to supply power to the electronic fuel injection system 200, and the battery module 3 no longer forms a circuit with the electronic fuel injection system 200.

[0053] Specifically, Figure 2 As shown, in one embodiment, based on the previous embodiment, the electronic switch is a relay, one end of the coil of the relay is connected to the voltage output end of the magnetic motor 100, and the other end is grounded, one end of the normally closed contact of the relay is grounded, and the other end is connected to the negative pole of the battery module 3 through the switch module 4.

[0054] In this embodiment, when the switch module 4 is disconnected, the engine cannot be started. When the switch module 4 is closed, the engine has no speed when the manual start of the engine is not involved. At this time, the magneto 100 has no voltage output, the coil of the relay is not energized, and the normally closed contact of the relay is closed, then the circuit formed by the switch module 4, the normally closed contact of the relay, the battery module 3 and the electronic fuel injection system 200 is closed, and at this time the battery module 3 supplies power to the electronic fuel injection system 200, and the electronic fuel injection system 200 starts and starts to work; during the manual start of the engine and after the engine is started, the engine has a speed, at this time the magneto 100 has a voltage output, the coil of the relay is energized, and the normally closed contact of the relay is disconnected, then the circuit formed by the switch module 4, the normally closed contact of the relay, the battery module 3 and the electronic fuel injection system 200 is disconnected, and at this time the power supply of the electronic fuel injection system 200 is switched from the battery module 3 to the magneto 100, and the voltage regulator 1 converts the AC voltage output by the magneto 100 that changes with the engine speed into the desired DC voltage to supply power to the electronic fuel injection system 200, and the battery module 3 no longer forms a circuit with the electronic fuel injection system 200.

[0055] Specifically, in some other embodiments, Figure 1 , Figure 2 The electronic switches in the circuit can also adopt controllable electronic drive devices such as thyristors, transistors, field effect transistors, and thyristors.

[0056] Specifically, Figure 1 , Figure 2 As shown, in one embodiment, a diode is connected between the power supply port 5 and the connection point between the voltage output end of the voltage regulator 1 and the power supply control module 2 to prevent the current of the battery module 3 from flowing back to the power supply control module 2 and energizing the power supply control module 2.

[0057] Specifically, in one embodiment, the diode is a Schottky diode. The forward voltage drop of the Schottky diode is much lower than that of a fast recovery common diode, so the power consumption is small, the efficiency is high, and the reverse charge recovery time is very short, so it is suitable for working in a high frequency state and can withstand high surge current.

[0058] Specifically, in one embodiment, the battery module 3 is an alkaline battery or a nickel-metal hydride battery. In this embodiment, since the electronic fuel injection system 200 is powered directly by the magneto 100 after the engine is started, and the battery module 3 only powers the electronic fuel injection system 200 in a short period of time after the switch module 4 is closed and before the engine is manually started, the battery module 3 has low capacity requirements, so inexpensive alkaline batteries or nickel-metal hydride batteries can be used. Specifically, the alkaline battery or nickel-metal hydride battery can be rechargeable or non-rechargeable.

[0059] Specifically, in one embodiment, the switch module 4 is a power switch provided by the engine. The power switch provided by the engine is used to control the battery module 3 to supply power to the electronic fuel injection system 200. Therefore, when the engine needs to be used, as long as the power switch is closed, the electronic fuel injection system 200 can be powered and work. The structure is simple, the operation is convenient, and the cost of the power supply control circuit can be effectively reduced.

[0060] The embodiment of the present application also provides a general engine, including the power supply control circuit of the engine electronic fuel injection system in any of the above embodiments. The working principle of the general engine is the same as that of the power supply control circuit of the engine electronic fuel injection system, and has the same effective effect as that of the power supply control circuit of the engine electronic fuel injection system, which will not be repeated here.

[0061] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application.

Claims

1. A power supply control circuit for an engine electronic fuel injection system, wherein a magnetic motor is installed on the engine, characterized in that: The power supply control circuit includes a voltage regulator, a power supply control module, a battery module, a switch module and a power supply port. The voltage output end of the magnetic motor is connected to the voltage input end of the voltage regulator, the voltage output end of the voltage regulator, the switch module and the negative electrode of the battery module are respectively connected to the power supply control module, the voltage output end of the voltage regulator and the positive electrode of the battery module are connected to the power supply port, and the power supply port is used to connect the power input end of the electronic fuel injection system to supply power to the electronic fuel injection system. in, When the switch module is closed and there is no voltage output at the voltage output terminal of the magnetic motor, the power supply control module controls the battery module to supply power to the electronic fuel injection system; When the switch module is closed and the voltage output terminal of the magnetic motor has a voltage output, the power supply control module switches the power supply of the electronic fuel injection system from the battery module to the magnetic motor.

2. The power supply control circuit of the engine electronic fuel injection system according to claim 1, characterized in that: The power supply control module is an electronic switch, the voltage output end of the voltage regulator is connected to the input circuit of the electronic switch, one end of the output circuit of the electronic switch is connected to the switch module, and the other end is connected to the negative electrode of the battery module, wherein: When the switch module is closed and there is no voltage output at the voltage output terminal of the magnetic motor, the output circuit of the electronic switch is closed, so that the battery module can supply power to the electronic fuel injection system; When the switch module is closed and there is voltage output at the voltage output end of the magnetic motor, the output circuit of the electronic switch is disconnected, so that the power supply circuit of the battery module for the electronic fuel injection system of the engine is disconnected, so as to switch the power supply of the electronic fuel injection system from the battery module to the magnetic motor.

3. The power supply control circuit of the engine electronic fuel injection system according to claim 2, characterized in that: The electronic switch is a relay, one end of the coil of the relay is connected to the voltage output end of the magnetic motor, and the other end is grounded. One end of the normally closed contact of the relay is grounded through the switch module, and the other end is connected to the negative pole of the battery module.

4. The power supply control circuit of the engine electronic fuel injection system according to claim 1, characterized in that: The power supply control module is an electronic switch, the voltage output end of the voltage regulator is connected to the input circuit of the electronic switch, one end of the output circuit of the electronic switch is grounded, and the other end is connected to the negative electrode of the battery module through the switch module, wherein: When the switch module is closed and there is no voltage output at the voltage output terminal of the magnetic motor, the output circuit of the electronic switch is closed, so that the battery module can supply power to the electronic fuel injection system; When the switch module is closed and there is voltage output at the voltage output end of the magnetic motor, the output circuit of the electronic switch is disconnected, so that the power supply circuit of the battery module for the electronic fuel injection system of the engine is disconnected, so as to switch the power supply of the electronic fuel injection system from the battery module to the magnetic motor.

5. The power supply control circuit of the engine electronic fuel injection system according to claim 4, characterized in that: The electronic switch is a relay, one end of the coil of the relay is connected to the voltage output end of the magnetic motor, and the other end is grounded. One end of the normally closed contact of the relay is grounded, and the other end is connected to the negative pole of the battery module through the switch module.

6. The power supply control circuit of the engine electronic fuel injection system according to claim 1, characterized in that: A diode is connected between the power supply port and a connection point between the voltage output end of the voltage regulator and the power supply control module.

7. The power supply control circuit of the engine electronic fuel injection system according to claim 6, characterized in that: The diode is a Schottky diode.

8. The power supply control circuit of the engine electronic fuel injection system according to any one of claims 1 to 7, characterized in that: The battery module is an alkaline battery or a nickel-hydrogen battery.

9. The power supply control circuit of the engine electronic fuel injection system according to any one of claims 1 to 7, characterized in that: The switch module is a power switch provided by the engine.

10. A general engine, characterized in that: A power supply control circuit for an engine electronic fuel injection system comprising any one of claims 1-9.

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