A start control system for an electronic fuel injection engine

Abstract

This invention provides a starting control system for an electronic fuel injection engine. The control system includes: an AC / DC voltage regulator, a first step-down circuit, a system controller, a second step-down circuit, a charging circuit, an energy storage module, and a boost circuit. The AC / DC voltage regulator converts the AC power output from the magneto generator into DC power to supply the fuel pump motor. Simultaneously, the first step-down circuit steps down the DC power output from the AC voltage regulator to provide short-term power to the ECU controller and system controller of the electronic fuel injection engine. The charging circuit also charges the energy storage module with the stepped-down DC power, allowing the stored energy to be boosted and used to continue supplying power to the ECU controller after the magneto generator stops outputting AC power. Therefore, even without a high-power battery, the ECU controller can continue to operate normally until the normal starting conditions of the electronic fuel injection engine are met, thereby reducing the size and management complexity of the electronic fuel injection engine.

Description

Technical Field

[0001] This invention relates to the field of starting technology for electronic fuel injection engines, and more particularly to a starting control system for electronic fuel injection engines. Background Technology

[0002] Electronic fuel injection (EFI) engines employ an electronic control unit (ECU). Various sensors input signals such as engine temperature, air-fuel ratio, throttle position, engine speed, load, and crankshaft position into the ECU. Based on these parameters, the ECU calculates and controls the amount and timing of fuel injection for each cylinder. Gasoline is atomized and injected into the intake manifold under pressure, mixing with the incoming airflow before entering the combustion chamber for combustion. This results in more complete combustion, less black smoke, and higher fuel efficiency, ensuring the engine and catalytic converter always operate at their optimal levels. As a result, electronic control units are gradually replacing traditional mechanical systems (such as carburetors) in controlling the engine's fuel supply process. Currently, general-purpose gasoline engines are also increasingly adopting EFI technology.

[0003] However, existing technologies for starting electronic fuel injection engines typically use high-power batteries to provide long-term power to the fuel pump motor and ECU. This not only increases the size of the electronic fuel injection engine, but also requires regular charging or replacement of the battery, increasing the difficulty of battery management. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a starting control system for an electronic fuel injection engine, which solves the problems of increased size and management difficulties in the starting control of electronic fuel injection engines in existing technologies.

[0005] This invention provides a starting control system for an electronic fuel injection engine. The control system includes: an AC / DC voltage regulator, a first step-down circuit, a system controller, a second step-down circuit, a charging circuit, an energy storage module, and a boost circuit. The input terminal of the AC / DC voltage regulator is connected to a magneto generator, and the output terminal of the AC / DC voltage regulator is connected to the fuel pump motor of the electronic fuel injection engine. It converts the AC power output from the magneto generator into DC power, which then powers the fuel pump motor. The input terminal of the first step-down circuit is connected to the output terminal of the AC / DC voltage regulator. The first output terminal of the first step-down circuit is connected to the ECU controller of the electronic fuel injection engine, and the second output terminal of the first step-down circuit is connected to the system controller. It converts the DC power output from the AC / DC voltage regulator into different voltage values ​​to power the ECU controller and the system controller, respectively. The input terminal of the second step-down circuit is connected to the first output terminal of the first step-down circuit. The charging circuit is used to convert the first voltage value output by the first step-down circuit into a second voltage value; the power supply terminal of the charging circuit is connected to the output terminal of the second step-down circuit, the control terminal of the charging circuit is connected to the system controller, and the output terminal of the charging circuit is connected to the energy storage module, used to charge the energy storage module according to the charging control signal output by the system controller; the power supply terminal of the boost circuit is connected to the energy storage module, the control terminal of the boost circuit is connected to the system controller, and the output terminal of the boost circuit is connected to the power supply terminal of the ECU controller, used to boost the voltage output by the energy storage module to obtain a third voltage value according to the boost control signal of the system controller, so that the third voltage value supplies power to the system controller; the system controller is also connected to the input terminal of the AC / DC voltage regulator, used to output corresponding charging control signals or boost control signals according to the AC input state of the magneto generator.

[0006] Optionally, the first step-down circuit includes: a first resistor, a first transistor, a second resistor, a first Zener diode, a first diode, a second diode, a third diode, a fourth diode, and a third resistor; the collector of the first transistor is connected to the AC / DC voltage regulator through the first resistor, the base of the first transistor is connected to the AC / DC voltage regulator through the second resistor, and the base of the first transistor is grounded; the cathode of the first Zener diode is connected to the base of the first transistor, and the anode of the first Zener diode is grounded; the anode of the first diode is connected to the emitter of the first transistor, the cathode of the first diode is connected to the cathode of the second diode, the cathode of the third diode, and the first terminal of the third resistor, respectively, and the anode of the second diode is grounded; the anode of the third diode is connected to the anode of the fourth diode, and the cathode of the fourth diode is grounded; wherein, the cathode of the fourth diode is the first output terminal of the first step-down circuit, and the second terminal of the third resistor is the second output terminal of the first step-down circuit.

[0007] Optionally, the first step-down circuit further includes: a second Zener diode and a first capacitor; the cathode of the second Zener diode is connected to the second terminal of the third resistor, the anode of the second Zener diode is grounded, the first terminal of the first capacitor is connected to the second terminal of the third resistor, and the second terminal of the first capacitor is grounded.

[0008] Optionally, the charging circuit includes: a charging chip, a second transistor, a fourth resistor, a third transistor, and a fifth resistor; the power supply terminal of the charging chip is connected to the output terminal of the second step-down circuit, the control terminal of the charging chip is connected to the collector of the second transistor, the emitter of the second transistor is grounded, and the base of the second transistor is connected to the system controller through the fourth resistor; the base of the third transistor is connected to the system controller through the fifth resistor, the emitter of the third transistor is grounded, and the base of the third transistor is connected to the energy storage module.

[0009] Optionally, the energy storage module includes: an energy storage element and a relay; the first end of the relay coil is connected to the input end of the second step-down circuit, the second end of the relay coil is connected to the collector of the third transistor, the first switch end of the relay is connected to the output end of the charging chip, and the second switch end of the relay is connected to the energy storage element.

[0010] Optionally, the second step-down circuit includes: a first step-down chip, a first inductor, a second capacitor, and a fifth diode; the input terminal of the first step-down chip is connected to the first output terminal of the first step-down circuit, the output terminal of the first step-down chip is connected to the first terminal of the first inductor, the second terminal of the first inductor is connected to the power supply terminal of the first step-down chip, the cathode of the fifth diode is connected to the first terminal of the first inductor, the first terminal of the second capacitor is connected to the second terminal of the first inductor, the anode of the fifth diode and the second terminal of the second capacitor are grounded, and the second terminal of the first inductor is also connected to the power supply terminal of the charging circuit.

[0011] Optionally, the boost circuit includes: a boost chip, a fourth transistor, a sixth resistor, a first MOSFET, a second inductor, a sixth diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a third capacitor; the input terminal of the boost chip is connected to the collector of the fourth transistor, the emitter and base of the fourth transistor are connected to the system controller through the sixth resistor, the output terminal of the boost chip is connected to the gate of the first MOSFET, and the source of the first MOSFET is grounded through the seventh resistor; the first terminal of the second inductor is connected to the first terminal of the relay switch, the second terminal of the second inductor is connected to the drain of the first MOSFET and the anode of the sixth diode, the cathode of the sixth diode is connected to the first terminal of the eighth resistor and the first terminal of the tenth resistor, the second terminal of the eighth resistor is grounded through the ninth resistor, and the second terminal of the tenth resistor is connected to the second terminal of the eighth resistor through the third capacitor; wherein, the first terminal of the tenth resistor is the output terminal of the boost circuit.

[0012] Optionally, the boost circuit further includes: a seventh diode, an eleventh resistor, a twelfth resistor, and a thirteenth resistor; the anode of the seventh diode is connected to the first output terminal of the first buck circuit, the cathode of the seventh diode is connected to the first terminal of the twelfth resistor through the eleventh resistor, the second terminal of the twelfth resistor is connected to the input terminal of the boost chip, and the second terminal of the eleventh resistor is also connected to the first terminal of the tenth resistor through the thirteenth resistor.

[0013] Optionally, the AC / DC voltage regulator includes: a thyristor rectifier circuit, the input terminal of which is connected to the magneto generator of the electronic fuel injection engine, for rectifying the AC power output by the magneto generator into DC power; and a step-down constant current circuit, the input terminal of which is connected to the output terminal of the thyristor rectifier circuit, and the output terminal of which is connected to the first step-down circuit, for converting the DC power output by the thyristor rectifier circuit into a constant voltage.

[0014] Optionally, the thyristor rectifier circuit includes: a first thyristor, a second thyristor, a third thyristor, an eighth diode, a ninth diode, a fifth transistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a tenth diode, an eleventh diode, a twelfth diode, a thirteenth diode, and a third Zener diode; the anode of the first thyristor is connected to the first output terminal of the magnetogenerator, the control electrode of the first thyristor is connected to the cathode of the first thyristor through the fourteenth resistor, the anode of the first thyristor is connected to the cathode of the eighth diode, and the anode of the eighth diode is grounded; the anode of the second thyristor is connected to the second output terminal of the magnetogenerator, the controller of the second thyristor is connected to the cathode of the second thyristor through the fifteenth resistor, the anode of the second thyristor is connected to the cathode of the ninth diode, and the ninth... The anode of the diode is grounded; the cathode of the third thyristor is connected to the anodes of the tenth and eleventh diodes respectively through the sixteenth resistor; the cathode of the tenth diode is connected to the control electrode of the first thyristor; the cathode of the eleventh diode is connected to the control electrode of the second thyristor; the anode of the third thyristor is connected to the cathodes of the twelfth and thirteenth diodes respectively; the anode of the twelfth diode is connected to the cathode of the eighth diode; and the anode of the thirteenth diode is connected to the cathode of the ninth diode; the collector of the fifth transistor is connected to the control electrode of the third thyristor; the emitter of the fifth transistor is grounded; the base of the fifth transistor is connected to the anode of the third Zener diode through the seventeenth resistor; and the cathode of the third Zener diode is connected to the cathode of the second thyristor.

[0015] Optionally, the step-down constant current circuit includes: a second step-down chip, a second MOSFET, an eighteenth resistor, a fourteenth diode, a nineteenth resistor, a twentieth resistor, a third inductor, a fourth capacitor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a fifteenth diode, a sixteenth diode, and a seventeenth diode; the input terminal of the second step-down chip is connected to the output terminal of the thyristor rectifier circuit through the twenty-eighth resistor, the first output terminal of the second step-down chip is connected to the gate of the second MOSFET through the eighteenth resistor, the drain of the second MOSFET is connected to the output terminal of the thyristor rectifier circuit, the source of the second MOSFET is connected to the first terminal of the nineteenth resistor, the first terminal of the twentyth resistor, and the cathode of the fourteenth diode, respectively, and the anode of the fourteenth diode is grounded; the first terminal of the third inductor... The second terminal of the third inductor is connected to the second terminals of the nineteenth and twentyth resistors respectively. The second terminal of the third inductor is grounded through the fourth capacitor. The second terminal of the third inductor is also connected to the second output terminal of the second step-down chip through the twenty-second resistor. The second output terminal of the second step-down chip is also connected to the first terminal of the twenty-fifth resistor through the twenty-third resistor. The second terminal of the twenty-fifth resistor is grounded through the twenty-seventh resistor. The twenty-fourth resistor is connected in parallel with the twenty-third resistor, and the twenty-sixth resistor is connected in parallel with the twenty-fifth resistor. The second terminal of the third inductor is also connected to the anode of the fifteenth diode. The cathode of the fifteenth diode is connected to the cathode of the sixteenth diode and the input terminal of the second step-down chip respectively. The anode of the sixteenth diode is connected to the first step-down circuit. The cathode of the seventeenth diode is connected to the anode of the fifteenth diode, and the anode of the seventeenth diode is grounded.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention uses an AC / DC voltage regulator to convert the AC power output from the magneto generator into DC power to supply power to the fuel pump motor of the electronic fuel injection engine, thereby starting the fuel pump motor. Simultaneously, a first step-down circuit steps down the DC power output from the AC direct voltage regulator to provide short-term power to the ECU controller and system controller of the electronic fuel injection engine, and charges the energy storage module with the stepped-down DC power through a charging circuit. This allows the stored energy in the energy storage module to be boosted to continue supplying power to the ECU controller after the magneto generator stops outputting AC power. This cyclical charge and discharge control allows the ECU controller to continue operating normally without a high-power battery until the normal starting conditions of the electronic fuel injection engine are met, thereby reducing the size and management difficulty of the electronic fuel injection engine. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a start-up control system for an electronic fuel injection engine provided in an embodiment of the present invention;

[0019] Figure 2 This is a circuit diagram of a starting control system for an electronic fuel injection engine provided in an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example 1

[0022] Figure 1 This is a schematic diagram of the structure of a starting control system for an electronic fuel injection engine provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the start control system 100 of the electronic fuel injection engine includes:

[0023] AC / DC voltage regulator 110, first step-down circuit 120, system controller 130, second step-down circuit 140, charging circuit 150, energy storage module 160, and boost circuit 170;

[0024] The input terminal of the AC / DC voltage regulator 110 is connected to the magnetic generator 200, and the output terminal of the AC / DC voltage regulator 110 is connected to the oil pump motor 300 of the electronic fuel injection engine. It is used to convert the AC power output by the magnetic generator 200 into DC power so that the DC power supplies the oil pump motor 300.

[0025] The input terminal of the first step-down circuit 120 is connected to the output terminal of the AC / DC voltage regulator 110, the first output terminal of the first step-down circuit 120 is connected to the ECU controller 400 of the electronic fuel injection engine, and the second output terminal of the first step-down circuit 120 is connected to the system controller 130. It is used to convert the DC power output by the AC / DC voltage regulator 110 into different voltage values ​​to power the ECU controller 400 and the system controller 130 respectively.

[0026] The input terminal of the second step-down circuit 140 is connected to the first output terminal of the first step-down circuit 120, and is used to convert the first voltage value output by the first step-down circuit 120 into a second voltage value.

[0027] The power supply terminal of the charging circuit 150 is connected to the output terminal of the second step-down circuit 140, the control terminal of the charging circuit 150 is connected to the system controller 130, and the output terminal of the charging circuit 150 is connected to the energy storage module 160, for charging the energy storage module 160 according to the charging control signal output by the system controller 130.

[0028] The power supply terminal of the boost circuit 170 is connected to the energy storage module 160, the control terminal of the boost circuit 170 is connected to the system controller 130, and the output terminal of the boost circuit 170 is connected to the power supply terminal of the ECU controller 400. It is used to boost the voltage output by the energy storage module 160 to obtain a third voltage value according to the boost control signal of the system controller 130, so that the third voltage value supplies power to the system controller 130.

[0029] The system controller 130 is also connected to the input terminal of the AC / DC voltage regulator 110, and is used to output corresponding charging control signals or boost control signals according to the AC input state of the magnetic generator 200.

[0030] It should be noted that the magnetic generator in this embodiment is a manually operated pull-start engine. It can be part of an electronic fuel injection engine or a component other than an electronic fuel injection engine. By manually pulling the pull once, the low-speed magnetic generator can generate AC power for 2-3 seconds. The energy storage module includes an energy storage element and a relay. The relay is used to control the charging and discharging of the energy storage element, wherein the energy storage element is a supercapacitor, a low-power lithium battery, or a nickel-metal hydride battery.

[0031] The working principle of the electronic fuel injection engine start control system provided in this embodiment is as follows:

[0032] The AC power output from the magneto generator is converted into DC power by an AC / DC voltage regulator to power the fuel pump motor of the electronic fuel injection engine, thereby starting the fuel pump motor. At the same time, the first step-down circuit steps down the DC power output from the AC direct voltage regulator to power the ECU controller and system controller of the electronic fuel injection engine.

[0033] Furthermore, since the AC power output from the magneto generator is short-lived, it cannot maintain the normal operation of the ECU controller before the electronic fuel injection generator reaches the starting conditions. In this embodiment, after the AC power output from the magneto generator is no longer available, in order to ensure the normal operation of the ECU controller, the boost circuit boosts the voltage output from the energy storage module according to the boost control signal output by the system controller to supply power to the ECU controller. In this embodiment, the energy storage module can generally only output a voltage of 3.5V, while the ECU controller supply voltage is 13.5V, so it is necessary to boost the output voltage of the energy storage module.

[0034] Furthermore, when the system controller detects that the magnetogenerator outputs AC power again before the energy storage module has finished discharging, the system controller controls the boost circuit to stop working; at the same time, the system controller controls the charging circuit to work, charging the energy storage module with the voltage output by the second buck circuit, so that the fully charged energy storage module can ensure the normal operation of the ECU controller after the magnetogenerator stops outputting AC power; this cycle of charging and discharging control allows the ECU controller to work normally without a high-power battery, until the normal starting conditions of the electronic fuel injection engine are met.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] This invention uses an AC / DC voltage regulator to convert the AC power output from the magneto generator into DC power to supply power to the fuel pump motor of the electronic fuel injection engine, thereby starting the fuel pump motor. Simultaneously, a first step-down circuit steps down the DC power output from the AC direct voltage regulator to provide short-term power to the ECU controller and system controller of the electronic fuel injection engine, and charges the energy storage module with the stepped-down DC power through a charging circuit. This allows the stored energy in the energy storage module to be boosted to continue supplying power to the ECU controller after the magneto generator stops outputting AC power. This cyclical charge and discharge control allows the ECU controller to continue operating normally without a high-power battery until the normal starting conditions of the electronic fuel injection engine are met, thereby reducing the size and management difficulty of the electronic fuel injection engine.

[0037] Example 2

[0038] Figure 2 This invention provides a circuit diagram of a starting control system for an electronic fuel injection engine; as shown in the embodiment of the invention. Figure 2 As shown, the first step-down circuit 120 includes:

[0039] The first resistor R1, the first transistor Q1, the second resistor R2, the first Zener diode DZ1, the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, and the third resistor R3;

[0040] The collector of the first transistor Q1 is connected to the AC / DC voltage regulator 110 through the first resistor R1, and the base of the first transistor Q1 is connected to the AC / DC voltage regulator 110 through the second resistor R2. The base of the first transistor Q1 is grounded. The cathode of the first Zener diode DZ1 is connected to the base of the first transistor Q1, and the anode of the first Zener diode DZ1 is grounded. The anode of the first diode D1 is connected to the emitter of the first transistor Q1, and the cathode of the first diode D1 is connected to the cathode of the second diode D2, the cathode of the third diode D3, and the first terminal of the third resistor R3. The anode of the second diode D2 is grounded. The anode of the third diode D3 is connected to the anode of the fourth diode D4, and the cathode of the fourth diode D4 is grounded. The cathode of the fourth diode D4 is the first output terminal of the first buck circuit, and the second terminal of the third resistor R3 is the second output terminal of the first buck circuit.

[0041] In this embodiment, the first step-down circuit further includes: a second Zener diode DZ2 and a first capacitor C1; the cathode of the second Zener diode DZ2 is connected to the second terminal of the third resistor R3, the anode of the second Zener diode DZ2 is grounded, the first terminal of the first capacitor C1 is connected to the second terminal of the third resistor R3, and the second terminal of the first capacitor C1 is grounded.

[0042] In this embodiment, the AC / DC voltage regulator 110 includes: a thyristor rectifier circuit 111, the input terminal of which is connected to the magneto generator of the electronic fuel injection engine, for rectifying the AC power output by the magneto generator into DC power; and a step-down constant current circuit 112, the input terminal of which is connected to the output terminal of the thyristor rectifier circuit, and the output terminal of which is connected to the first step-down circuit, for converting the DC power output by the thyristor rectifier circuit into a constant voltage.

[0043] It should be noted that, as Figure 2 As shown, the first step-down circuit includes a step-down module 1 composed of a first resistor R1, a first transistor Q1, a second resistor R2, and a first Zener diode DZ1; an isolation module composed of D1, D2, D3, and D4; and a step-down module 2 composed of resistor R3. The specific working principle is as follows: the DC power output from the thyristor rectifier circuit is input into the step-down constant current circuit for step-down, and the other path is input into the step-down module 1 composed of the first resistor, the first transistor, and the second resistor for step-down. After being reverse isolated by diode D1, it is input into the step-down module 2 for further step-down to VCC5V to power the system controller U4.

[0044] In this embodiment, to improve the power supply stability of the system controller U4, the first step-down circuit provides power to the system controller U4 through three power supplies, namely:

[0045] The first path: The step-down module composed of R1, R2, Q1 and DZ1 supplies power to U4 through D1 and R3 after passing through the thyristor rectifier circuit output voltage.

[0046] Second path: The voltage output from the boost circuit powers U4 after passing through D2 and R3;

[0047] The third path: The voltage output from the step-down constant current circuit is used to power U4 through D3 and R3.

[0048] In this embodiment, the working principle of the step-down module 1 composed of the first resistor, the first transistor, the second resistor, and the first Zener diode is as follows: the voltage output by the thyristor rectifier circuit is stepped down by R2 and then output to the cathode of DZ1. When DZ1 is turned on, the base of Q1 is grounded and Q1 is turned off; when DZ1 is turned off, Q1 is turned on and outputs the corresponding voltage according to the regulated voltage value of DZ1.

[0049] The first and second Zener diodes stabilize the output voltage, and the first capacitor filters the voltage.

[0050] like Figure 2 As shown, the second step-down circuit in this embodiment is a step-down chip U5, which takes the 13.5V voltage output from the first output terminal of the first step-down circuit and inputs it through pin 1 of U5, steps it down to 5V, and then outputs it to the charging circuit through pin 3.

[0051] like Figure 2 As shown, the charging circuit 150 includes: a charging chip U1, a second transistor Q2, a fourth resistor R4, a third transistor Q3, and a fifth resistor R5; the power supply terminal of the charging chip U1 is connected to the output terminal of the second step-down circuit, the control terminal of the charging chip U1 is connected to the collector of the second transistor Q2, the emitter of the second transistor Q2 is grounded, and the base of the second transistor Q2 is connected to the system controller through the fourth resistor R4; the base of the third transistor Q3 is connected to the system controller through the fifth resistor R5, the emitter of the third transistor Q3 is grounded, and the base of the third transistor Q3 is connected to the energy storage module.

[0052] In this embodiment, the energy storage module includes: an energy storage element BT and a relay K1; the first end of the coil of the relay K1 is connected to the input end of the second step-down circuit, the second end of the coil of the relay K1 is connected to the collector of the third transistor Q3, the first switch end of the relay K1 is connected to the output end of the charging chip U1, and the second switch end of the relay K1 is connected to the energy storage element BT.

[0053] It should be noted that the system controller in this embodiment is a microcontroller U4. Pin 2 of U4 is the power supply terminal, and pin 8 is the detection terminal for the working status of the magnetic generator. Through the magnetic generator signal sensing circuit composed of R30, R31, DZ5, R32, and R33, the system controller detects the working status of the magnetic generator and outputs the corresponding control signal. Pin 3 of the microcontroller U4 is the control terminal for the relay working status, and pin 7 is the control terminal for the charging status and boost status.

[0054] The charging circuit in this embodiment works as follows: When pin 3 of the microcontroller U4 outputs a high level, the third transistor conducts, energizing relay K1 and closing the switch, thus connecting the energy storage element BT to the output terminal of the charging circuit. Simultaneously, when pin 7 of the microcontroller U4 outputs a low level, the second transistor Q2 conducts, putting the charging chip U1 into operation, and the output voltage charges the energy storage element BT. The charging circuit starts working under microcontroller control for 10 seconds before entering charging mode. Pin 1 of U1 is connected to a 5V power input terminal, pin 2 is connected to the charging voltage control terminal 1K (the target full charge voltage of 4.2V), pin 3 is connected to an LED charging status indicator, pin 4 controls whether charging is enabled, pin 5 controls the fast charging time, pin 6 is connected to the temperature control terminal, pin 7 is connected to the constant current terminal, and pin 8 is connected to the charging output control terminal.

[0055] In this embodiment, the second step-down circuit includes: a first step-down chip U5, a first inductor L1, a second capacitor C2, and a fifth diode D5; the input terminal of the first step-down chip U5 is connected to the first output terminal of the first step-down circuit, the output terminal of the first step-down chip U5 is connected to the first terminal of the first inductor L1, the second terminal of the first inductor L1 is connected to the power supply terminal of the first step-down chip U5, the cathode of the fifth diode D5 is connected to the first terminal of the first inductor L1, the first terminal of the second capacitor C2 is connected to the second terminal of the first inductor L1, the anode of the fifth diode D5 and the second terminal of the second capacitor C2 are grounded, and the second terminal of the first inductor L1 is also connected to the power supply terminal of the charging circuit.

[0056] It should be noted that pin 1 of the buck converter chip U5 is the input pin. The PWM signal output from pin 2 causes L1, D5 and C2 to step down the input voltage according to the duty cycle of the PWM signal. The stepped-down voltage is then input to the charging circuit, and the stepped-down voltage is fed back to pin 3 of the buck converter chip U5 to provide power to U5.

[0057] like Figure 2 As shown, the boost circuit 170 includes: a boost chip U2, a fourth transistor Q4, a sixth resistor R6, a first MOSFET G1, a second inductor L2, a sixth diode D6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a third capacitor C3; the input terminal of the boost chip U2 is connected to the collector of the fourth transistor Q4, the emitter and base of the fourth transistor Q4 are connected to the system controller through the sixth resistor R6, the output terminal of the boost chip U2 is connected to the gate of the first MOSFET G1, and the source of the first MOSFET G1 is connected to the gate of the first MOSFET G1. The circuit is grounded through the seventh resistor R7; the first end of the second inductor L2 is connected to the first terminal of the relay switch, the second end of the second inductor L2 is connected to the drain of the first MOSFET G1 and the anode of the sixth diode D6, the cathode of the sixth diode D6 is connected to the first end of the eighth resistor R8 and the first end of the tenth resistor R10, the second end of the eighth resistor R8 is grounded through the ninth resistor R9, and the second end of the tenth resistor R10 is connected to the second end of the eighth resistor R8 through the third capacitor C3; wherein, the first end of the tenth resistor R10 is the output terminal of the boost circuit.

[0058] It should be noted that the working principle of the boost circuit in this embodiment is as follows: When pin 3 of the microcontroller U4 outputs a high level, the third transistor is turned on, energizing the relay to close the switch, thereby connecting the energy storage element BT to the input terminal of the boost circuit; at the same time, when pin 7 of the microcontroller U4 outputs a high level, the second transistor Q2 is turned off, causing the charging chip U1 to stop working, and the fourth transistor is turned on, causing the boost chip U2 to work. The output PWM signal causes the first MOSFET to alternately turn on, converting the output voltage of the energy storage element into AC power through the second inductor and the alternately turned first MOSFET. After rectification by the sixth diode, the voltage is regulated by the eighth, ninth, and tenth resistors, boosting the output voltage of the energy storage element to power the ECU controller.

[0059] In this embodiment, the boost circuit 170 further includes: a seventh diode D7, an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13; the anode of the seventh diode D7 is connected to the first output terminal of the first buck circuit, the cathode of the seventh diode D7 is connected to the first terminal of the twelfth resistor R12 through the eleventh resistor R11, the second terminal of the twelfth resistor R12 is connected to the input terminal of the boost chip, and the second terminal of the eleventh resistor R11 is also connected to the first terminal of the tenth resistor through the thirteenth resistor R13.

[0060] It should be noted that since the boost chip U2 operates when pin 1 is at a high level, thus causing pin 7 to output a PWM signal, the level of pin 1 is pulled high through two branch circuits composed of the seventh diode, the eleventh resistor, the twelfth resistor, and the thirteenth resistor: Branch 1, composed of D7, R11, and R12, pulls the voltage output by D4 in the first buck circuit to the high level of pin 1 after being stepped down and current-limited by D7, R11, and R12; Branch 2, composed of R13 and R12, pulls the voltage output by the boost circuit itself to the high level of pin 1 after being stepped down and current-limited by R13 and R12.

[0061] like Figure 2 As shown, in this embodiment, the thyristor rectifier circuit 111 includes: a first thyristor S1, a second thyristor S2, a third thyristor S3, an eighth diode D8, a ninth diode D9, a fifth transistor Q5, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a tenth diode D10, an eleventh diode D11, a twelfth diode D12, a thirteenth diode D13, and a third Zener diode DZ3; the anode of the first thyristor S1 is connected to the first output terminal of the magnetic generator, and the first thyristor... The control electrode of thyristor S1 is connected to the cathode of the first thyristor S1 through the fourteenth resistor R14, and the anode of the first thyristor S1 is connected to the cathode of the eighth diode D8, the anode of the eighth diode D8 is grounded; the anode of the second thyristor S2 is connected to the second output terminal of the magnetic generator, the controller of the second thyristor S2 is connected to the cathode of the second thyristor S2 through the fifteenth resistor R15, and the anode of the second thyristor S2 is connected to the cathode of the ninth diode D9, the anode of the ninth diode D9 is grounded;

[0062] The cathode of the third thyristor S3 is connected to the anode of the tenth diode D10 and the anode of the eleventh diode D11 through the sixteenth resistor R16. The cathode of the tenth diode D10 is connected to the control electrode of the first thyristor S1, and the cathode of the eleventh diode D11 is connected to the control electrode of the second thyristor S2. The anode of the third thyristor S3 is connected to the cathodes of the twelfth diode D12 and the thirteenth diode D13. The anode of the twelfth diode D12 is connected to the cathode of the eighth diode D8, and the anode of the thirteenth diode D13 is connected to the cathode of the ninth diode D9.

[0063] The collector of the fifth transistor Q5 is connected to the control electrode of the third thyristor S3, the emitter of the fifth transistor Q5 is grounded, the base of the fifth transistor Q5 is connected to the anode of the third Zener diode DZ3 through the seventeenth resistor R17, and the cathode of the third Zener diode DZ3 is connected to the cathode of the second thyristor S2.

[0064] It should be noted that S1, S2, D8, and D9 form a dual-function thyristor rectification and voltage regulation module. The voltage value is determined by DZ3, Q5, and S3, and it can output a fixed DC voltage of 12V-27V between the input AC voltage of 15V and 200V.

[0065] like Figure 2 As shown, the step-down constant current circuit 112 includes: a second step-down chip U3, a second MOSFET, an eighteenth resistor R18, a fourteenth diode D14, a nineteenth resistor R19, a twentieth resistor R20, a third inductor L3, a fourth capacitor C4, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a fifteenth diode D15, a sixteenth diode D16, and a seventeenth diode D17;

[0066] The input terminal of the second step-down chip U3 is connected to the output terminal of the thyristor rectifier circuit through the 28th resistor R28. The first output terminal of the second step-down chip U3 is connected to the gate of the second MOS transistor through the 18th resistor R18. The drain of the second MOS transistor is connected to the output terminal of the thyristor rectifier circuit. The source of the second MOS transistor is connected to the first terminal of the 19th resistor R19, the first terminal of the 20th resistor R20, and the cathode of the 14th diode D14. The anode of the 14th diode D14 is grounded.

[0067] The first terminal of the third inductor L3 is connected to the second terminal of the nineteenth resistor R19 and the second terminal of the twentieth resistor R20. The second terminal of the third inductor L3 is grounded through the fourth capacitor C4. The second terminal of the third inductor L3 is also connected to the second output terminal of the second step-down chip U3 through the twenty-second resistor R22. The second output terminal of the second step-down chip U3 is also connected to the first terminal of the twenty-fifth resistor through the twenty-third resistor R23. The second terminal of the twenty-fifth resistor R25 is grounded through the twenty-seventh resistor R27. The twenty-fourth resistor R24 ​​is connected in parallel with the twenty-third resistor R23. The twenty-sixth resistor R26 is connected in parallel with the twenty-fifth resistor R25.

[0068] The second terminal of the third inductor L3 is also connected to the anode of the fifteenth diode D15. The cathode of the fifteenth diode D15 is connected to the cathode of the sixteenth diode D16 and the input terminal of the second step-down chip U3, respectively. The anode of the sixteenth diode D16 is connected to the first step-down circuit. The cathode of the seventeenth diode D17 is connected to the anode of the fifteenth diode D15, and the anode of the seventeenth diode D17 is grounded.

[0069] In this embodiment, the working principle of the step-down constant current circuit is as follows: the voltage output by the thyristor rectifier circuit is stepped down by the step-down circuit composed of G2, R18, R19, R20, D14, L3, C4 and R21, and then output through the second terminal of L3. The detection circuit composed of R22, R23, R24, R25, R26 and R27 controls the duty cycle of the PWM signal output from pin 1 of the step-down chip U3, thereby causing the second terminal of L3 to output a constant current. Furthermore, the DC current output by the thyristor rectifier circuit generates a start-up voltage for the step-down chip U3 through resistor R28, then generates a continuous working voltage for U3 through Q1 and D16, and finally generates a normal working voltage for the step-down chip U3 through L3 and D15.

[0070] In this embodiment, the status indicator circuit composed of resistor R34 and light-emitting diode LD outputs a corresponding signal through pin 1 of microcontroller U4, so that LD is in the off, slow flashing, and fast flashing states, respectively representing the different working states of the start control system.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0072] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A starting control system for an electrically injected engine, characterized by The control system includes: AC / DC voltage regulator, first step-down circuit, system controller, second step-down circuit, charging circuit, energy storage module, boost circuit; The input terminal of the AC / DC voltage regulator is connected to the magnetic generator, and the output terminal of the AC / DC voltage regulator is connected to the oil pump motor of the electronic fuel injection engine. It is used to convert the AC power output by the magnetic generator into DC power so that the DC power supplies the oil pump motor. The input terminal of the first step-down circuit is connected to the output terminal of the AC / DC voltage regulator, the first output terminal of the first step-down circuit is connected to the ECU controller of the electronic fuel injection engine, and the second output terminal of the first step-down circuit is connected to the system controller. It is used to convert the DC power output by the AC / DC voltage regulator into different voltage values ​​to power the ECU controller and the system controller respectively. The input terminal of the second step-down circuit is connected to the first output terminal of the first step-down circuit, and is used to convert the first voltage value output by the first step-down circuit into a second voltage value. The power supply terminal of the charging circuit is connected to the output terminal of the second step-down circuit, the control terminal of the charging circuit is connected to the system controller, and the output terminal of the charging circuit is connected to the energy storage module, which is used to charge the energy storage module according to the charging control signal output by the system controller. The power supply terminal of the boost circuit is connected to the energy storage module, the control terminal of the boost circuit is connected to the system controller, and the output terminal of the boost circuit is connected to the power supply terminal of the ECU controller. It is used to boost the voltage output by the energy storage module to obtain a third voltage value according to the boost control signal of the system controller, so that the third voltage value supplies power to the ECU controller. The system controller is also connected to the input terminal of the AC / DC voltage regulator, and is used to output a corresponding charging control signal or boost control signal according to the AC input state of the magneto generator; wherein, the system controller is configured to: when AC input is detected from the magneto generator, output a charging control signal to control the charging circuit to charge the energy storage module; when AC input from the magneto generator is detected to be stopped, output a boost control signal to control the boost circuit to boost the voltage output by the energy storage module to supply power to the ECU controller.

2. The start-up control system for an electrically injected engine according to claim 1, wherein The first step-down circuit includes: First resistor, first transistor, second resistor, first Zener diode, first diode, second diode, third diode, fourth diode, third resistor, second Zener diode, and first capacitor. The collector of the first transistor is connected to the AC / DC voltage regulator through the first resistor, and the base of the first transistor is connected to the AC / DC voltage regulator through the second resistor; the cathode of the first Zener diode is connected to the base of the first transistor, and the anode of the first Zener diode is grounded. The anode of the first diode is connected to the emitter of the first transistor, and the cathode of the first diode is connected to the cathode of the second diode, the cathode of the third diode, and the first terminal of the third resistor. The anode of the second diode is grounded. The anode of the third diode is connected to the anode of the fourth diode, and the cathode of the fourth diode is grounded. The cathode of the second Zener diode is connected to the second terminal of the third resistor, the anode of the second Zener diode is grounded, the first terminal of the first capacitor is connected to the second terminal of the third resistor, and the second terminal of the first capacitor is grounded. Wherein, the cathode of the fourth diode is the first output terminal of the first step-down circuit, and the second terminal of the third resistor is the second output terminal of the first step-down circuit.

3. The start-up control system for an electrically injected engine of claim 1 wherein, The charging circuit includes: Charging chip, second transistor, fourth resistor, third transistor and fifth resistor; The power supply terminal of the charging chip is connected to the output terminal of the second step-down circuit, the control terminal of the charging chip is connected to the collector of the second transistor, the emitter of the second transistor is grounded, and the base of the second transistor is connected to the system controller through the fourth resistor. The base of the third transistor is connected to the system controller through the fifth resistor, the emitter of the third transistor is grounded, and the base of the third transistor is connected to the energy storage module.

4. The start-up control system for an electrically injected engine according to claim 3, wherein The energy storage module includes: Energy storage components and relays; The first end of the relay coil is connected to the input end of the second step-down circuit, the second end of the relay coil is connected to the collector of the third transistor, the first end of the relay switch is connected to the output end of the charging chip, and the second end of the relay switch is connected to the energy storage element.

5. The start-up control system for an electrically injected engine of claim 1 wherein, The second step-down circuit includes: The first step-down chip, the first inductor, the second capacitor, and the fifth diode; The input terminal of the first step-down chip is connected to the first output terminal of the first step-down circuit. The output terminal of the first step-down chip is connected to the first terminal of the first inductor. The second terminal of the first inductor is connected to the power supply terminal of the first step-down chip. The cathode of the fifth diode is connected to the first terminal of the first inductor. The first terminal of the second capacitor is connected to the second terminal of the first inductor. The anode of the fifth diode and the second terminal of the second capacitor are grounded. The second terminal of the first inductor is also connected to the power supply terminal of the charging circuit.

6. The start-up control system for an electrically injected engine of claim 4 wherein, The boost circuit includes: The boost converter chip, the fourth transistor, the sixth resistor, the first MOSFET, the second inductor, the sixth diode, the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, and the third capacitor; The input terminal of the boost chip is connected to the collector of the fourth transistor, the emitter of the fourth transistor is grounded, the base of the fourth transistor is connected to the system controller through the sixth resistor, the output terminal of the boost chip is connected to the gate of the first MOS transistor, and the source of the first MOS transistor is grounded through the seventh resistor. The first end of the second inductor is connected to the second terminal of the relay switch. The second end of the second inductor is connected to the drain of the first MOS transistor and the anode of the sixth diode. The cathode of the sixth diode is connected to the first end of the eighth resistor and the first end of the tenth resistor. The second end of the eighth resistor is grounded through the ninth resistor. The second end of the tenth resistor is connected to the second end of the eighth resistor through the third capacitor. The first end of the tenth resistor is the output terminal of the boost circuit.

7. The start-up control system for an electrically injected engine of claim 6 wherein, The boost circuit also includes: Seventh diode, eleventh resistor, twelfth resistor, thirteenth resistor; The anode of the seventh diode is connected to the first output terminal of the first buck circuit, the cathode of the seventh diode is connected to the first terminal of the eleventh resistor through the eleventh resistor, the second terminal of the twelfth resistor is connected to the input terminal of the boost chip, and the second terminal of the eleventh resistor is also connected to the first terminal of the tenth resistor through the thirteenth resistor.

8. The start-up control system for an electrically injected engine of claim 1 wherein, The AC / DC voltage regulator includes: A thyristor rectifier circuit, the input terminal of which is connected to the magneto generator of the electronic fuel injection engine, is used to rectify the AC power output by the magneto generator into DC power. A step-down constant current circuit is provided, wherein the input terminal of the step-down constant current circuit is connected to the output terminal of the thyristor rectifier circuit, and the output terminal of the step-down constant current circuit is connected to the first step-down circuit, for converting the DC power output by the thyristor rectifier circuit into a constant voltage.

9. The start-up control system for an electrically injected engine of claim 8 wherein, The thyristor rectifier circuit includes: First thyristor, second thyristor, third thyristor, eighth diode, ninth diode, fifth transistor, fourteenth resistor, fifteenth resistor, sixteenth resistor, seventeenth resistor, tenth diode, eleventh diode, twelfth diode, thirteenth diode and third Zener diode; The anode of the first thyristor is connected to the first output terminal of the magneto-generator, the control electrode of the first thyristor is connected to the cathode of the first thyristor through the fourteenth resistor, and the anode of the first thyristor is connected to the cathode of the eighth diode, the anode of the eighth diode is grounded; the anode of the second thyristor is connected to the second output terminal of the magneto-generator, the control electrode of the second thyristor is connected to the cathode of the second thyristor through the fifteenth resistor, and the anode of the second thyristor is connected to the cathode of the ninth diode, the anode of the ninth diode is grounded; The cathode of the third thyristor is connected to the anode of the tenth diode and the anode of the eleventh diode through the sixteenth resistor. The cathode of the tenth diode is connected to the control electrode of the first thyristor. The cathode of the eleventh diode is connected to the control electrode of the second thyristor. The anode of the third thyristor is connected to the cathode of the twelfth diode and the cathode of the thirteenth diode. The anode of the twelfth diode is connected to the cathode of the eighth diode. The anode of the thirteenth diode is connected to the cathode of the ninth diode. The collector of the fifth transistor is connected to the control electrode of the third thyristor, the emitter of the fifth transistor is grounded, the base of the fifth transistor is connected to the anode of the third Zener diode through the seventeenth resistor, and the cathode of the third Zener diode is connected to the cathode of the second thyristor.

10. The start-up control system for an electrically injected engine of claim 8 wherein, The step-down constant current circuit includes: The second step-down chip, the second MOSFET, the eighteenth resistor, the fourteenth diode, the nineteenth resistor, the twentieth resistor, the third inductor, the fourth capacitor, the twenty-first resistor, the twenty-second resistor, the twenty-third resistor, the twenty-fourth resistor, the twenty-fifth resistor, the twenty-sixth resistor, the twenty-seventh resistor, the twenty-eighth resistor, the fifteenth diode, the sixteenth diode, and the seventeenth diode; The input terminal of the second step-down chip is connected to the output terminal of the thyristor rectifier circuit through the 28th resistor. The first output terminal of the second step-down chip is connected to the gate of the second MOS transistor through the 18th resistor. The drain of the second MOS transistor is connected to the output terminal of the thyristor rectifier circuit. The source of the second MOS transistor is connected to the first terminal of the 19th resistor, the first terminal of the 20th resistor, and the cathode of the 14th diode. The anode of the 14th diode is grounded. The first end of the third inductor is connected to the second end of the nineteenth resistor and the second end of the twentieth resistor respectively. The second end of the third inductor is grounded through the fourth capacitor. The second end of the third inductor is also connected to the second output terminal of the second step-down chip through the twentieth resistor. The second output terminal of the second step-down chip is also connected to the first end of the twentieth resistor through the twentieth resistor. The second end of the twentieth resistor is grounded through the twentieth resistor. The twentieth resistor is connected in parallel with the twentieth resistor. The twentieth resistor is connected in parallel with the twentieth resistor. The second terminal of the third inductor is also connected to the anode of the fifteenth diode. The cathode of the fifteenth diode is connected to the cathode of the sixteenth diode and the input terminal of the second step-down chip, respectively. The anode of the sixteenth diode is connected to the first step-down circuit. The cathode of the seventeenth diode is connected to the anode of the fifteenth diode, and the anode of the seventeenth diode is grounded.

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