Engine control circuit

Abstract

The invention provides an engine control circuit, and relates to the technical field of engine control, the engine control circuit is arranged between a coil and an engine high-voltage pack, a power supply line and a ground wire are arranged between the coil and the engine high-voltage pack, the engine control circuit is provided with a single chip microcomputer and a main control circuit, and the main control circuit is provided with a P-MOS tube, a thyristor and a main control power supply. The drain electrode of the P-MOS tube is communicated with the control electrode G of the thyristor, the grid electrode of the P-MOS tube is communicated with the single chip microcomputer, and the source electrode of the P-MOS tube is communicated with the main control power supply; the main electrode T2 of the thyristor is communicated with the power supply line, and the main electrode T1 of the thyristor is grounded; the single-chip microcomputer controls on-off of the thyristor by controlling the P-MOS tube, periodically controls whether the ignition plug of the engine is ignited by the high-voltage pack of the engine, controls output and speed of the engine, and further controls running speed of the kart.

Description

Technical Field

[0001] The present application belongs to the technical field of engine control, and more specifically, relates to an engine control circuit. Background Art

[0002] As people's living standards improve, entertainment activities become more and more diverse. Karting, as an exciting, competitive and inexpensive entertainment project, is becoming more and more popular. However, as a motor vehicle, karts travel at a high speed and are prone to danger during driving. For example, in the passenger pick-up and drop-off area of ​​a kart racing field, pedestrians and running cars coexist. If the vehicle speed is not restricted, accidents are likely to occur. There is an urgent practical need to limit the speed of karts.

[0003] The kart uses a single-cylinder engine that uses an external coil to trigger ignition. Every time the engine rotates, the coil is triggered to generate electricity, driving the high-voltage package to generate high-voltage electricity, which then drives the spark plug to ignite, completing a working cycle of the engine.

[0004] The existing engine control circuits have the following main problems: controlling the throttle and then the speed through electromechanical control requires a complex mechanical structure, which is costly and prone to damage; and using electromechanical output consumes a lot of power and has a short endurance. Summary of the invention

[0005] The purpose of the present invention is to make up for the deficiencies of the prior art and provide an engine control circuit. The technical solution adopted in this application is:

[0006] An engine control circuit is arranged between a coil and an engine high-voltage package, and a power supply line and a ground line are arranged between the coil and the engine high-voltage package; the control circuit is provided with a single-chip microcomputer and a main control circuit, and the main control circuit is provided with a P-MOS tube, a thyristor and a main control power supply, the drain of the P-MOS tube is connected to the control level G of the thyristor, the gate of the P-MOS tube is connected to the single-chip microcomputer, and the source of the P-MOS tube is connected to the main control power supply; the main electrode T2 of the thyristor is connected to the power supply line, and the main electrode T1 of the thyristor is grounded.

[0007] Optionally, the main control circuit is provided with a main control resistor, and the main control resistor is provided between the drain of the P-MOS tube and the control stage G of the thyristor.

[0008] Optionally, the main control circuit is further provided with a main control diode, which is provided between the main electrode T2 of the thyristor and the power supply line, the anode of the main control diode is connected to the main electrode T2 of the thyristor, and the cathode of the main control diode is connected to the power supply line.

[0009] Optionally, a plurality of main control diodes are provided and arranged in sequence, and anodes and cathodes of adjacent main control diodes are connected.

[0010] Optionally, a detection circuit is also provided, and the detection circuit is arranged between the power supply line and the single-chip microcomputer; the detection circuit is provided with a linear voltage regulator and a detection diode, and the detection diode is arranged between the input stage of the linear voltage regulator and the power supply line, the anode of the detection diode is connected to the power supply line, and the cathode of the detection diode is connected to the input stage of the linear voltage regulator; the output stage of the linear voltage regulator is connected to the single-chip microcomputer.

[0011] Optionally, the detection circuit is further provided with a first protection circuit, the first protection circuit is provided with a first TVS tube, the cathode of the first TVS tube is arranged between the linear regulator and the detection diode and are interconnected, and the anode of the first TVS tube is grounded.

[0012] Optionally, the detection circuit is also provided with a diode clamping circuit, the midpoint of the diode clamping circuit is arranged between the output stage of the linear regulator and the single chip microcomputer and are interconnected; the anode of the diode clamping circuit is grounded, and the cathode of the diode clamping circuit is connected to the main control power supply.

[0013] Optionally, the detection circuit is further provided with a detection capacitor, one end of which is provided between the diode clamping circuit and the single-chip microcomputer and is interconnected; the other end of the detection capacitor is grounded.

[0014] Optionally, the detection circuit is further provided with a current limiting resistor, and the current limiting resistor is arranged between the output stage of the linear voltage regulator and the single chip microcomputer.

[0015] Optionally, a charging circuit and an external power supply are also provided, the charging circuit is arranged between the power supply line and the external power supply; a second linear regulator is provided on the charging circuit, the input stage of the second linear regulator is connected to the power supply line, and the output stage of the second linear regulator is connected to the external power supply.

[0016] Optionally, a charging diode is further provided in the charging circuit, and the charging diode is provided with a forward diode and a reverse diode, the cathode of the forward diode is connected to the cathode of the reverse diode, the anode of the forward diode is connected to the power supply line, and the anode of the reverse diode is connected to the input stage of the second linear regulator.

[0017] Optionally, the charging circuit is further provided with an energy storage capacitor, one end of which is arranged between the reverse diode and the external power supply and is connected to each other; the other end of the energy storage capacitor is grounded.

[0018] Optionally, a second protection circuit is further provided on the charging circuit, and the second protection circuit is provided with a second TVS tube, the cathode of the second TVS tube is arranged between the forward diode and the reverse diode and are connected to each other, and the anode of the second TVS tube is grounded.

[0019] Optionally, a plurality of reverse diodes are provided and arranged in sequence, and anodes and cathodes of adjacent reverse diodes are connected.

[0020] Optionally, the thyristor is provided with a first bias circuit, which is provided between the control stage G and the main electrode T1 of the thyristor; and a first bias resistor is provided on the first bias circuit.

[0021] Optionally, the P-MOS tube is provided with a second bias circuit, which is arranged between the source and the gate of the P-MOS tube; and a second bias resistor is arranged on the second bias circuit.

[0022] The advantages of the present invention are as follows:

[0023] The single-chip microcomputer controls the P-MOS tube, and then controls the on and off of the thyristor, periodically controls whether the engine high-voltage package ignites the engine spark plug, controls the engine output and speed, and then controls the speed of the kart;

[0024] When the thyristor is disconnected, the coil current passes through the engine high-voltage package and can ignite normally. At this time, the coil current does not pass through the thyristor; when the thyristor is connected, the negative current of the coil is directly short-circuited and discharged by the thyristor. After the negative current is short-circuited, the ignition of this cycle can be stopped, and the engine speed will gradually decrease, limiting the engine output and speed, so that the driving speed of the kart is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained like these drawings without paying any creative labor.

[0026] Figure 1 It is a schematic diagram of the engine control circuit;

[0027] Figure 2 is the voltage curve of the coil output.

[0028] Explanation of symbols in the figure:

[0029] 1 is a coil, 11 is a power supply line;

[0030] 2 is the engine high voltage package, 21 is the ground wire;

[0031] 3 is a single chip microcomputer;

[0032] 4 is a main control circuit, 41 is a P-MOS tube, 411 is a drain, 412 is a gate, 413 is a source, 414 is a second bias circuit, 4141 is a second bias resistor, 42 is a thyristor, 421 is a first bias circuit, 4211 is a first bias resistor, 43 is a main control power supply, 44 is a main control resistor, and 45 is a main control diode;

[0033] 5 is a detection circuit, 51 is a linear regulator, 52 is a detection diode, 53 is a first protection circuit, 531 is a first TVS tube, 54 is a diode clamping circuit, 55 is a detection capacitor, and 56 is a current limiting resistor;

[0034] 6 is a charging circuit, 61 is a second linear regulator, 62 is a charging diode, 621 is a forward diode, 622 is a reverse diode, 63 is an energy storage capacitor, 64 is a second protection circuit, and 641 is a second TVS tube;

[0035] 7 is an external power supply. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] like Figure 1 As shown, an engine control circuit is arranged between a coil 1 and an engine high-voltage package 2, and a power supply line 11 and a ground line 21 are arranged between the coil 1 and the engine high-voltage package 2; the control circuit is provided with a single-chip computer 3 and a main control circuit 4, and the main control circuit 4 is provided with a P-MOS tube 41, a thyristor 42 and a main control power supply 43, the drain 411 of the P-MOS tube 41 is connected to the control level G of the thyristor 42, the gate 412 of the P-MOS tube 41 is connected to the single-chip computer 3, and the source 413 of the P-MOS tube 41 is connected to the main control power supply 43; the main electrode T2 of the thyristor 42 is connected to the power supply line 11, and the main electrode T1 of the thyristor 42 is grounded.

[0038] like Figure 2 As shown in the figure, when there is no external intervention, the voltage curve output by coil 1 contains 4 groups of pulse cycles, corresponding to four cycles of engine operation; each cycle contains two positive pulses and one negative pulse, of which the first positive pulse charges the engine high-voltage package 2, and after the engine high-voltage package 2 is charged, a negative high-voltage pulse will be generated, and the negative high-voltage pulse will ignite the spark plug through the subsequent circuit; after ignition, a second positive pulse will be generated. Among them, the voltage peak of the positive pulse is not high, and is normally below 20V; the negative pulse contains a high-frequency high-voltage pulse, and its voltage peak can reach more than negative 100V. There must be corresponding protection devices in the circuit, and the connected devices can also withstand the negative high voltage. When the engine speed increases, the cycle time is shortened, and the peak value of the positive pulse remains basically unchanged. In order to ensure the safety and stability of the circuit, it is necessary to leave as much redundancy as possible for the negative pulse to prevent breakdown and damage to the device.

[0039] like Figure 1 and Figure 2As shown, the circuit of the present invention intervenes in the operation process of the coil 1-engine high-voltage package 2, and completes the ignition control of the engine spark plug by utilizing the output voltage of the coil 1. The output voltage of the coil 1 is divided into positive voltage and negative voltage. Among them, when the ignition is disabled, the negative voltage is directly turned on and short-circuited by the thyristor 42; during normal ignition, the thyristor 42 is in the off state and does not process the negative voltage.

[0040] When the engine needs to be ignited normally, the requirement for the engine high-voltage package 2 is: the positive voltage of the coil 1 needs to be relatively high voltage, which is used to charge the engine high-voltage package 2 to ensure the operation of the engine.

[0041] When the engine needs to prohibit ignition, the requirement for the engine high-voltage package 2 is: the lower the forward voltage, the better. If the forward voltage is too high, even if the negative voltage is completely short-circuited, ignition cannot be prohibited.

[0042] Therefore, the key to the control of the present invention is to control the forward voltage of the coil 1 within a suitable value range.

[0043] The single chip computer 3 controls the on and off of the thyristor 42 by controlling the P-MOS tube 41, and periodically controls whether the engine high voltage package 2 ignites the spark plug of the engine, controls the engine output and speed, and further controls the driving speed of the kart.

[0044] When the thyristor 42 is disconnected, the current of the coil 1 passes through the engine high-voltage package 2 and can be ignited normally. At this time, the current of the coil 1 does not pass through the thyristor 42; when the thyristor 42 is connected, the negative current of the coil 1 is directly short-circuited and discharged by the thyristor 42. After the negative current is short-circuited, the ignition of this cycle can be stopped, the engine speed will gradually decrease, limiting the engine output and speed, so that the driving speed of the kart is reduced.

[0045] The main control circuit 4 is provided with a main control resistor 44, which is provided between the drain 411 of the P-MOS tube 41 and the control level G of the thyristor 42. In this embodiment, the resistance of the main control resistor 44 is 1000 ohms, and the resistance of the main control resistor 44 can be adjusted according to actual conditions.

[0046] The main control circuit 4 is further provided with a main control diode 45, which is provided between the main electrode T2 of the thyristor 42 and the power supply line 11, the anode of the main control diode 45 is connected to the main electrode T2 of the thyristor, and the cathode of the main control diode 45 is connected to the power supply line 11. When the thyristor 42 is turned on, the forward voltage of the coil 1 is controlled by the main control diode 45.

[0047] Among them, there can also be multiple main control diodes 45 arranged in sequence, and the anodes and cathodes of adjacent main control diodes 45 are connected. At this time, the forward voltage of the coil 1 is equal to the sum of the voltages of all the main control diodes 45, which is jointly determined by the voltage and number of the main control diodes 45.

[0048] The control circuit is also provided with a detection circuit 5, which is arranged between the power supply line 11 and the single-chip computer 3; the detection circuit 5 is provided with a linear regulator 51 and a detection diode 52, the detection diode 52 is arranged between the input stage of the linear regulator 51 and the power supply line 11, the anode of the detection diode 52 is connected to the power supply line 11, and the cathode of the detection diode 52 is connected to the input stage of the linear regulator 51; the output stage of the linear regulator 51 is connected to the single-chip computer 3.

[0049] The single chip microcomputer 3 determines the running progress of the engine through the detection circuit 5, and determines when to turn on the thyristor 42 and when to turn off the thyristor 42. The single chip microcomputer 3 controls the ratio of turning on and off the thyristor 42 by adjusting the ratio of the engine high voltage package 2 to ignite and not ignite the spark plug of the engine, and adjusts the engine speed and output to achieve speed control of the kart.

[0050] The detection circuit 5 requires that the forward voltage of the coil 1 is not lower than a certain voltage, which is used to generate a signal and transmit it to the single chip computer 3 to judge the state. The control circuit 4 and the charging circuit 6 cooperate with each other to control the forward voltage of the coil 1 to be maintained within a certain range.

[0051] The detection circuit 5 is further provided with a first protection circuit 53. The first protection circuit 53 is provided with a first TVS tube 531. The cathode of the first TVS tube 531 is provided between the linear regulator 51 and the detection diode 52 and connected to each other. The anode of the first TVS tube 531 is grounded.

[0052] The detection circuit 5 is also provided with a diode clamp circuit 54, the midpoint of which is located between the output stage of the linear regulator 51 and the single chip computer 3 and connected to each other; the anode of the diode clamp circuit 54 is grounded, and the cathode of the diode clamp circuit 54 is connected to the main control power supply 43.

[0053] The detection circuit 5 is further provided with a detection capacitor 55, one end of which is provided between the diode clamp circuit 54 and the single chip microcomputer 3 and connected to each other; the other end of the detection capacitor 55 is grounded. The detection capacitor 55 is used to filter the detection circuit 5, and the filtered signal is transmitted to the single chip microcomputer 3.

[0054] The detection circuit 5 is further provided with a current limiting resistor 56, which is arranged between the output stage of the linear regulator 51 and the single chip computer 3. The current limiting resistor 56 is used to adjust the current on the detection circuit 5, and can also be arranged at other positions of the detection circuit 5.

[0055] A charging circuit 6 and an external power supply 7 are also provided. The charging circuit 6 is arranged between the power supply line 11 and the external power supply 7. A second linear regulator 61 is provided on the charging circuit 6. The input stage of the second linear regulator 61 is connected to the power supply line 11, and the output stage of the second linear regulator 61 is connected to the external power supply 7.

[0056] After being stabilized by the second linear regulator 61, a voltage not higher than a specified voltage value is output to the subsequent stage.

[0057] The charging circuit 6 is also provided with a charging diode 62, and the charging diode 62 is provided with a forward diode 621 and a reverse diode 622. The cathode of the forward diode 621 is connected to the cathode of the reverse diode 622, the anode of the forward diode 621 is connected to the power supply line 11, and the anode of the reverse diode 622 is connected to the input stage of the second linear regulator 61. Since the negative pulse voltage output by the coil 1 is too high and may directly affect the effect of the engine high-voltage package 2, the energy recovery circuit still uses the forward diode 621 to filter out the negative voltage, does not affect the negative pulse, and ensures the normal operation of the engine high-voltage package 2.

[0058] The charging circuit 6 is also provided with an energy storage capacitor 63, one end of which is arranged between the reverse diode 622 and the external power supply 7 and connected to each other; the other end of the energy storage capacitor 63 is grounded. When the battery is fully charged and the current usage of the subsequent stage decreases, without the second linear regulator 61, the energy storage capacitor 63 may continue to charge until the forward pulse peak value is the same as that in normal circumstances. The second linear regulator 61 and the energy storage capacitor 63 cooperate with each other to avoid damage to the subsequent stage devices.

[0059] The charging circuit 6 is also provided with a second protection circuit 64, and the second protection circuit 64 is provided with a second TVS tube 641. The cathode of the second TVS tube 641 is arranged between the forward diode 621 and the reverse diode 622 and are connected to each other, and the anode of the second TVS tube 641 is grounded.

[0060] Requirements for charging circuit 6: The positive energy of coil 1 should be recycled as much as possible to extend the battery life.

[0061] During normal ignition, the thyristor 42 is not turned on, and the forward voltage of the coil 1 is controlled by the charging circuit 6. The forward voltage of the coil 1 is equal to the sum of the voltage of the charging diode 62 and the voltage of the energy storage capacitor 63. At this time, it is higher than the ignition voltage required by the detection circuit 5 and generates a signal and transmits it to the single chip computer 3;

[0062] There are multiple reverse diodes 622 arranged in sequence, and the anodes and cathodes of adjacent reverse diodes 622 are connected. The voltage and number of reverse diodes 622 are adjusted to change the voltage of charging circuit 6, adjust the forward voltage of coil 1, and complete the distribution of energy to coil 1 for ignition of engine high-voltage package 2, or for energy recovery in charging circuit 6; the greater the voltage and the greater the number of reverse diodes 622, the higher the voltage of charging circuit 6, the more energy is distributed to engine high-voltage package 2, the higher the forward voltage of coil 1, the better the operation, and the lower the recovered energy; the smaller the voltage and the fewer the number of reverse diodes 622, the lower the voltage of charging circuit 6, the more energy is recovered by charging circuit 6, the forward voltage of coil 1 is reduced, the operational reliability is deteriorated, and the forward voltage of coil 1 is too low, which will also cause the detection circuit 5 to fail to work normally.

[0063] When the external power supply 7 is fully charged and no longer needs to be charged, the voltage of the energy storage capacitor 63 will gradually increase, and the forward voltage of the coil 1 will also gradually increase, reaching a non-interference operation state; the number of reverse diodes 622 is adjusted according to actual needs, taking into account both engine operation and charging efficiency.

[0064] When ignition is disabled, the main control diode 45 and the thyristor 42 are connected normally, and the forward voltage of the coil 1 is controlled jointly by the control circuit 4 and the charging circuit 6; the control circuit 4 and the charging circuit 6 are connected in parallel to adjust the voltage and quantity of the main control diode 45 and the reverse diode 622, and the forward voltage of the coil 1 depends on the lower voltage of the two branches of the control circuit 4 and the charging circuit 6, and the lower voltage meets the requirements of the detection circuit 5.

[0065] The thyristor 42 is provided with a first bias circuit 421, which is provided between the control level G of the thyristor 42 and the main electrode T1; the first bias circuit 421 is provided with a first bias resistor 4211. In this embodiment, the resistance of the first bias resistor 4211 is 10 megohms. The first bias circuit 421 is used to ensure that the control level G of the thyristor 42 is at the same potential as the main electrode T1 when the thyristor 42 is powered on or when there is no control, and the thyristor 42 is in the off state.

[0066] The P-MOS tube 41 is provided with a second bias circuit 414, which is provided between the source 413 and the gate 412 of the P-MOS tube 41; the second bias circuit 414 is provided with a second bias resistor 4141. In this embodiment, the resistance of the second bias resistor 4141 is 10 megohms. The second bias circuit 414 ensures that the gate 412 and the source 413 of the P-MOS tube 41 are at the same potential when the P-MOS tube 41 is powered on or when there is no control, and the P-MOS tube 41 is in the off state.

[0067] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An engine control circuit, arranged between a coil and an engine high-voltage package, wherein a power supply line and a ground line are arranged between the coil and the engine high-voltage package, characterized in that: A single-chip computer and a main control circuit are provided, wherein the main control circuit is provided with a P-MOS tube, a thyristor and a main control power supply, wherein the drain of the P-MOS tube is connected to the control level G of the thyristor, the gate of the P-MOS tube is connected to the single-chip computer, and the source of the P-MOS tube is connected to the main control power supply; the main electrode T2 of the thyristor is connected to the power supply line, and the main electrode T1 of the thyristor is grounded.

2. The engine control circuit according to claim 1, characterized in that: The main control circuit is provided with a main control resistor, and the main control resistor is arranged between the drain of the P-MOS tube and the control stage G of the thyristor.

3. The engine control circuit according to claim 2, characterized in that: The main control circuit is further provided with a main control diode, which is arranged between the main electrode T2 of the thyristor and the power supply line, the anode of the main control diode is connected to the main electrode T2 of the thyristor, and the cathode of the main control diode is connected to the power supply line.

4. The engine control circuit according to claim 3, characterized in that: The main control diodes are provided in plurality and arranged in sequence, and the anodes and cathodes of adjacent main control diodes are connected.

5. The engine control circuit according to any one of claims 1 to 4, characterized in that: A detection circuit is also provided, which is arranged between the power supply line and the single-chip microcomputer; the detection circuit is provided with a linear regulator and a detection diode, the detection diode is arranged between the input stage of the linear regulator and the power supply line, the anode of the detection diode is connected to the power supply line, and the cathode of the detection diode is connected to the input stage of the linear regulator; the output stage of the linear regulator is connected to the single-chip microcomputer.

6. The engine control circuit according to claim 5, characterized in that: The detection circuit is further provided with a first protection circuit, the first protection circuit is provided with a first TVS tube, the cathode of the first TVS tube is arranged between the linear regulator and the detection diode and are connected to each other, and the anode of the first TVS tube is grounded.

7. The engine control circuit according to claim 6, characterized in that: The detection circuit is also provided with a diode clamping circuit, the midpoint of which is arranged between the output stage of the linear regulator and the single chip microcomputer and is interconnected; the anode of the diode clamping circuit is grounded, and the cathode of the diode clamping circuit is connected to the main control power supply.

8. The engine control circuit according to claim 7, characterized in that: The detection circuit is further provided with a detection capacitor, one end of which is arranged between the diode clamping circuit and the single chip microcomputer and is connected to each other; the other end of the detection capacitor is grounded.

9. The engine control circuit according to claim 8, characterized in that: The detection circuit is also provided with a current limiting resistor, and the current limiting resistor is arranged between the output stage of the linear regulator and the single chip microcomputer.

10. The engine control circuit according to any one of claims 1 to 4, characterized in that: A charging circuit and an external power supply are also provided. The charging circuit is arranged between the power supply line and the external power supply. A second linear regulator is provided on the charging circuit. The input stage of the second linear regulator is connected to the power supply line, and the output stage of the second linear regulator is connected to the external power supply.

11. The engine control circuit according to claim 10, characterized in that: The charging circuit is also provided with a charging diode, and the charging diode is provided with a forward diode and a reverse diode, the cathode of the forward diode is connected to the cathode of the reverse diode, the anode of the forward diode is connected to the power supply line, and the anode of the reverse diode is connected to the input stage of the second linear regulator.

12. The engine control circuit according to claim 11, characterized in that: The charging circuit is also provided with an energy storage capacitor, one end of which is arranged between the reverse diode and the external power supply and is connected to each other; the other end of the energy storage capacitor is grounded.

13. The engine control circuit according to claim 12, characterized in that: The charging circuit is also provided with a second protection circuit, the second protection circuit is provided with a second TVS tube, the cathode of the second TVS tube is arranged between the forward diode and the reverse diode and are connected to each other, and the anode of the second TVS tube is grounded.

14. The engine control circuit according to claim 11, characterized in that: The reverse diodes are provided in plurality and arranged in sequence, and the anodes and cathodes of adjacent reverse diodes are connected.

15. The engine control circuit according to any one of claims 1 to 4, characterized in that: The thyristor is provided with a first bias circuit, and the first bias resistor is provided between the control stage G of the thyristor and the main electrode T1; the first bias resistor is provided on the first bias circuit.

16. The engine control circuit according to any one of claims 1 to 4, characterized in that: The P-MOS tube is provided with a second bias circuit, and the second bias circuit is arranged between the source and the gate of the P-MOS tube; the second bias circuit is provided with a second bias resistor.

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