A high-speed electromagnetic valve flow measurement system mainboard

Abstract

The utility model provides a kind of high-speed electromagnetic valve flow measurement system mainboard, including MCU, general digital input circuit, general digital output circuit, nozzle drive circuit, oil pump drive circuit and flow interface exchange circuit;The MCU is connected with general digital input circuit, general digital output circuit, nozzle drive circuit, oil pump drive circuit and flowmeter interface circuit respectively;The general digital input circuit is connected with MCU, for receiving the digital signal of external equipment input;The general digital output circuit is connected with MCU;The nozzle drive circuit is connected with MCU;The oil pump drive circuit is connected with MCU;The flowmeter interface circuit is connected with MCU.The utility model can be used to adjust the flow output of oil atomizer cleaning machine, eliminates the error caused by artificial observation, realizes the high-precision measurement and automatic control of flow, improves the accuracy and reliability of nozzle electromagnetic valve flow measurement.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve flow measurement technology, and in particular to a motherboard for a high-speed electromagnetic valve flow measurement system. Background Technology

[0002] In the automotive manufacturing, machining, and related industrial sectors, fuel injectors are key components of the fuel system, and their performance directly affects engine operating efficiency and emissions. To ensure the proper functioning of fuel injectors, fuel injector cleaning machines are widely used in the maintenance and inspection of fuel injectors. Existing fuel injector cleaning machines typically integrate cleaning and flow measurement functions, aiming to monitor the flow characteristics of the fuel injectors while physically cleaning them. However, the flow measurement function of these cleaning machines often relies on a simple graduated cylinder measurement method, that is, collecting the fuel injected by the fuel injector and measuring its volume using a graduated cylinder to assess the fuel injector's flow rate.

[0003] While existing injector cleaning machines can meet the cleaning needs of injectors to some extent, this flow measurement method relies on manual observation of the measuring cylinder to determine the flow rate. Differences in perspective, experience, and operating habits among different operators when reading the cylinder scale often lead to inconsistent measurement results. This method is not only inefficient but also highly susceptible to human error, resulting in poor measurement stability and hindering the improvement of the efficiency and quality of injector cleaning and inspection. Utility Model Content

[0004] The purpose of this invention is to provide a high-speed solenoid valve flow measurement system mainboard, which can be used to adjust the flow output of an injector cleaning machine. This eliminates errors caused by manual observation, achieves high-precision flow measurement and automated control, and improves the accuracy and reliability of nozzle solenoid valve flow measurement. The specific technical solution is as follows:

[0005] A high-speed solenoid valve flow measurement system motherboard includes an MCU, a general-purpose digital input circuit, a general-purpose digital output circuit, a nozzle drive circuit, an oil pump drive circuit, and a flow interface switching circuit.

[0006] The MCU is connected to a general-purpose digital input circuit, a general-purpose digital output circuit, a nozzle drive circuit, an oil pump drive circuit, and a flow meter interface circuit, respectively. It is used for control and data processing, receiving signals from the general-purpose digital input circuit, controlling the output of the general-purpose digital output circuit, driving the nozzle and oil pump to work, and processing the flow data transmitted from the flow meter conversion circuit.

[0007] A general-purpose digital input circuit, which is connected to the MCU, is used to receive digital signals input from external devices and transmit the digital signals to the MCU;

[0008] A general-purpose digital output circuit, which is connected to the MCU, is used to receive digital signals output by the MCU and output digital signals to external devices;

[0009] A nozzle driving circuit, which is connected to an MCU, is used to receive control signals from the MCU to control the opening and closing of the nozzle and the flow rate of the nozzle.

[0010] An oil pump drive circuit is connected to an MCU and is used to drive the oil supply pump and receive instructions from the MCU to control the speed and start / stop of the oil pump.

[0011] The flow meter interface circuit is connected to the MCU and is used to convert the flow signal detected by the flow meter into an electrical signal format suitable for the MCU to process, and then transmit it to the MCU.

[0012] Preferably, it also includes a power supply circuit; the power supply circuit is connected to the MCU and is connected to an external DC power supply to power the MCU.

[0013] Preferably, it also includes an ADC and a DAC; the ADC and DAC are respectively connected to the MCU.

[0014] Preferably, it also includes a serial communication interface; the serial communication interface is connected to the MCU and provides the MCU with an interface for data communication with other devices or systems.

[0015] Preferably, the nozzle driving circuit includes resistors R8, R9, R10, and R11, an optocoupler U3, transistors Q4 and Q6, a power output transistor Q5, diodes D4, D5, and D6; the input terminal of the optocoupler U3 is connected to the power supply and resistor R10; the first terminals of transistors Q4 and Q6 are respectively connected to the output terminal of the optocoupler U3, the second terminal of transistor Q4 is connected to one end of the nozzle L1, and the third terminal of transistor Q6 is connected to the optocoupler U3. The output terminal is connected; one end of resistor R9 is connected to the third terminal of transistor Q4 and the second terminal of transistor Q6, and the other end is connected to the first terminal of power output transistor Q5. The second terminal of power output transistor Q5 is connected to the other end of nozzle L1; one end of resistor R11 is connected to the third terminal of power output transistor Q5, and the other end is grounded; resistor R8 is connected in parallel with transistor Q4; diode D5 is connected in parallel with resistor R9; diodes D4 and D6 are connected in parallel with power output transistor Q5.

[0016] Preferably, the oil pump drive circuit includes resistors R1, R3, R6, and R7, an optocoupler U1, transistors Q1 and Q3, a power output transistor Q2, and diodes D1 and D2. The input terminal of the optocoupler U1 is connected to the power supply and resistor R6. The first terminals of transistors Q1 and Q3 are respectively connected to the output terminals of optocoupler U1, the second terminal of transistor Q1 is connected to one end of oil pump B1, and the third terminal of transistor Q3 is connected to the output terminal of optocoupler U1. One end of resistor R3 is connected to both the third terminal of transistor Q1 and the second terminal of transistor Q3, and the other end is connected to the first terminal of power output transistor Q2. The second terminal of power output transistor Q2 is connected to the other end of oil pump B1. One end of resistor R7 is connected to the third terminal of power output transistor Q2, and the other end is grounded. Resistor R1 is connected in parallel with transistor Q1. Diode D1 is connected in parallel with resistor R3. Diode D2 is connected in parallel with oil pump B1.

[0017] Preferably, the flowmeter interface circuit includes resistors R2, R4, and R5, capacitors C1 and C2, diode D3, and optocoupler U2; the input terminal of optocoupler U2 is connected to the power supply and resistor R2; one end of resistor R4 is connected to the power supply and the output terminal of optocoupler U2, and the other end is connected to resistor R5 and the output terminal of optocoupler U2; the other end of resistor R5 is connected to the signal output terminal; one end of capacitor C1 is connected to the output terminal of optocoupler U2, and the other end is grounded; one end of capacitor C2 is connected to resistor R5, and the other end is grounded; diode D3 is connected in parallel with the input terminal of optocoupler U2.

[0018] Preferably, transistor Q4 is an NPN transistor and transistor Q6 is a PNP transistor.

[0019] Preferably, transistor Q1 is an NPN transistor and transistor Q3 is a PNP transistor.

[0020] Preferably, four identical nozzle drive circuits are set up, and the four nozzle drive circuits are respectively connected to the MCU.

[0021] Compared with existing technologies, this utility model has the following beneficial effects:

[0022] This invention utilizes a nozzle drive circuit, an oil pump drive circuit, and a flow meter interface circuit. The flow meter interface circuit acquires the flow rate data of the injector cleaner, and the nozzle drive circuit and oil pump drive circuit enable precise control of the nozzle solenoid valve and oil pump. The MCU performs real-time processing and analysis of the flow rate data, thereby adjusting the flow output of the injector cleaner. This eliminates errors caused by manual observation, achieving high-precision flow measurement and automated control, thus improving the accuracy and reliability of the measurement. Furthermore, this invention allows for flexible configuration of multiple nozzle drive circuits to meet different operating conditions, enhancing the system's adaptability and flexibility. The circuit also employs resistors, capacitors, diodes, and other components for current limiting, filtering, and protection, improving the overall stability and reliability of the system. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the nozzle drive circuit of this utility model.

[0026] Figure 3 This is a schematic diagram of the oil pump drive circuit of this utility model.

[0027] Figure 4 This is a schematic diagram of the flow meter interface circuit of this utility model. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0032] Example 1

[0033] The figure shows a high-speed solenoid valve flow measurement system motherboard, which includes an MCU, a general digital input circuit, a general digital output circuit, a nozzle drive circuit, an oil pump drive circuit, and a flow interface switching circuit.

[0034] The MCU is connected to a general-purpose digital input circuit, a general-purpose digital output circuit, a nozzle drive circuit, an oil pump drive circuit, and a flow meter interface circuit, respectively. It is used for control and data processing, receiving signals from the general-purpose digital input circuit, controlling the output of the general-purpose digital output circuit, driving the nozzle and oil pump to work, and processing the flow data transmitted from the flow meter conversion circuit.

[0035] A general-purpose digital input circuit, which is connected to the MCU, is used to receive digital signals input from external devices and transmit the digital signals to the MCU;

[0036] A general-purpose digital output circuit, which is connected to the MCU, is used to receive digital signals output by the MCU and output digital signals to external devices;

[0037] A nozzle driving circuit, which is connected to an MCU, is used to receive control signals from the MCU to control the opening and closing of the nozzle and the flow rate of the nozzle.

[0038] An oil pump drive circuit is connected to an MCU and is used to drive the oil supply pump and receive instructions from the MCU to control the speed and start / stop of the oil pump.

[0039] The flow meter interface circuit is connected to the MCU and is used to convert the flow signal detected by the flow meter into an electrical signal format suitable for the MCU to process, and then transmit it to the MCU.

[0040] Next, the working principle of this embodiment will be described in detail so that those skilled in the art can better understand this utility model:

[0041] The general-purpose digital input circuit is used to receive digital signals sent by external devices (such as control buttons, start buttons, stop buttons, and emergency stop buttons, or cabinet locks of control cabinets). The general-purpose digital input circuit receives these signals and transmits them to the MCU. After analyzing and processing these input signals, the MCU outputs corresponding control commands or feedback information to external devices through the general-purpose digital output circuit (such as indicator lights, pass lights, solenoid valves, cylinders, return oil pumps, and coolers in the production workshop).

[0042] In terms of nozzle and oil pump control, the MCU sends control signals to the nozzle drive circuit, which controls the opening and closing of the nozzles and adjusts the flow rate based on the signals. Simultaneously, the MCU issues commands to the oil pump drive circuit, which drives the oil pump and controls its speed and start / stop according to the MCU's commands to ensure the normal operation of the oil circuit system and the stability of the oil supply. After the flow meter detects the flow signal, it converts it into an electrical signal format suitable for MCU processing via the flow meter interface circuit and transmits it to the MCU.

[0043] Example 2

[0044] The difference between this embodiment and Embodiment 1 is that it also includes a power supply circuit; the power supply circuit is connected to the MCU and is powered by an external DC power supply. The power supply circuit is connected to the MCU and is powered by an external DC power supply (DC12~24V), providing stable power for the stable operation of the entire system and ensuring that each circuit module can function normally.

[0045] The working principle of this embodiment is the same as that of Embodiment 1.

[0046] Example 3

[0047] The difference between this embodiment and Embodiment 2 is that it also includes an ADC and a DAC; the ADC and DAC are respectively connected to the MCU. The ADC converts analog signals into digital signals and transmits them to the MCU so that the MCU can process and analyze the analog signals; the DAC converts digital signals into analog signals for driving analog devices or performing analog signal output control and other related operations. The ADC is used to receive data detected by external sensors, such as oil pressure, voltage, current, and liquid level, while the DAC serves as a reserved interface.

[0048] The working principle of this embodiment is the same as that of Embodiment 1.

[0049] Example 4

[0050] The difference between this embodiment and embodiment 3 is that it also includes a serial communication interface. This serial communication interface is connected to the MCU, providing the MCU with an interface for data communication with other devices or systems. During operation, the MCU can interact with other devices or systems (such as a display screen or host computer) through the serial communication interface to send and receive data, such as receiving control commands or parameter settings from external devices, and transmitting its own operating status and measurement data to external devices. This enables collaborative operation and remote monitoring of the entire system.

[0051] The working principle of this embodiment is the same as that of Embodiment 1.

[0052] Example 5

[0053] The difference between this embodiment and embodiment 4 is that the nozzle driving circuit includes resistors R8, R9, R10, and R11, an optocoupler U3, transistors Q4 and Q6, a power output transistor Q5, diodes D4, D5, and D6; the input terminal of the optocoupler U3 is connected to the power supply and resistor R10; the first terminals of transistors Q4 and Q6 are respectively connected to the output terminals of optocoupler U3, the second terminal of transistor Q4 is connected to one end of nozzle L1, and the third terminal of transistor Q6... The resistor R9 is connected to the output terminal of optocoupler U3; one end of resistor R9 is connected to the third terminal of transistor Q4 and the second terminal of transistor Q6, and the other end is connected to the first terminal of power output transistor Q5, and the second terminal of power output transistor Q5 is connected to the other end of nozzle L1; one end of resistor R11 is connected to the third terminal of power output transistor Q5, and the other end is grounded; resistor R8 is connected in parallel with transistor Q4; diode D5 is connected in parallel with resistor R9; diodes D4 and D6 are connected in parallel with power output transistor Q5.

[0054] The optocoupler U3 is used to achieve input isolation, and resistor R10 limits the current to about 10mA. Optocoupler U3 is used to convert the output level to the nozzle input voltage level, and then transistors Q4 and Q6 amplify the current of the transistors. Through resistor R9, the power output transistor Q5 is driven to control the switching of nozzle L1. Diode D5 is used to prevent the current from flowing through resistor R9 when it is turned off, so as to achieve rapid discharge turn-off and avoid the power output transistor Q5 being in the linear region. Diodes D4 and D6 control the reverse voltage amplitude of the nozzle. When turned off, the nozzle itself can generate an induced electromotive force of more than 100V. Diode D6 is a Zener diode with a breakdown voltage of 52V. When the induced electromotive force of nozzle L1 exceeds this voltage, diode D6 conducts, transistor Q5 turns on, and the nozzle current flows back to the power supply through transistor Q5 and resistor R11 until the induced electromotive force is less than the breakdown voltage of diode D6 before it turns off.

[0055] The working principle of this embodiment is the same as that of Embodiment 1.

[0056] Example 6

[0057] The difference between this embodiment and embodiment 5 is that the oil pump drive circuit includes resistors R1, R3, R6, and R7, an optocoupler U1, transistors Q1 and Q3, a power output transistor Q2, and diodes D1 and D2. The input terminal of the optocoupler U1 is connected to the power supply and resistor R6. The first terminals of transistors Q1 and Q3 are respectively connected to the output terminal of optocoupler U1, the second terminal of transistor Q1 is connected to one end of oil pump B1, and the third terminal of transistor Q3 is connected to the output terminal of optocoupler U1. One end of resistor R3 is connected to the third terminal of transistor Q1 and the second terminal of transistor Q3, and the other end is connected to the first terminal of power output transistor Q2. The second terminal of power output transistor Q2 is connected to the other end of oil pump B1. One end of resistor R7 is connected to the third terminal of power output transistor Q2, and the other end is grounded. Resistor R1 is connected in parallel with transistor Q1. Diode D1 is connected in parallel with resistor R3. Diode D2 is connected in parallel with oil pump B1.

[0058] The optocoupler U1 is used to achieve input isolation, and resistor R6 limits the current to about 10mA. The optocoupler U1 converts the output level to the voltage level of oil pump B1, and then transistors Q1 and Q3 amplify the current of the transistors. Through resistor R3, the power output transistor Q2 is driven to realize the switching control of oil pump B1. Diode D1 is used to achieve rapid discharge and turn-off without passing through resistor R3 when turned off, so as to avoid the power output transistor Q2 being in the linear region. The oil pump speed can be controlled by controlling the magnitude of the oil pump current through pulse width modulation of the input signal.

[0059] The working principle of this embodiment is the same as that of Embodiment 1.

[0060] Example 7

[0061] The difference between this embodiment and embodiment 6 is that the flowmeter interface circuit includes resistors R2, R4, and R5, capacitors C1 and C2, diode D3, and optocoupler U2; the input terminal of optocoupler U2 is connected to the power supply and resistor R2; one end of resistor R4 is connected to the output terminal of the power supply and optocoupler U2 respectively, and the other end is connected to the output terminal of resistor R5 and optocoupler U2 respectively; the other end of resistor R5 is connected to the signal output terminal; one end of capacitor C1 is connected to the output terminal of optocoupler U2, and the other end is grounded; one end of capacitor C2 is connected to resistor R5, and the other end is grounded; diode D3 is connected in parallel with the input terminal of optocoupler U2.

[0062] The optocoupler U2 is used to isolate the high-speed pulse signal. The flow meter outputs a 24V signal, which is limited by resistor R2. Diode D3 is used to prevent reverse connection of the input line and protect optocoupler U2 and flow meter. Capacitor C1 at the output of optocoupler U2 is used to decouple the signal. Resistor R4 is used to pull up the transistor inside optocoupler U2. Resistor R5 and capacitor C2 form an RC filter circuit to filter some signal noise.

[0063] The working principle of this embodiment is the same as that of Embodiment 1.

[0064] Example 8

[0065] The difference between this embodiment and embodiment 7 is that transistor Q4 is an NPN transistor and transistor Q6 is a PNP transistor. In the nozzle drive circuit, NPN transistor Q4 and PNP transistor Q6 cooperate to control the opening and closing of the nozzle and the adjustment of the flow rate according to the control signal sent by the MCU.

[0066] The working principle of this embodiment is the same as that of Embodiment 1.

[0067] Example 9

[0068] The difference between this embodiment and embodiment 8 is that transistor Q1 is an NPN transistor and transistor Q3 is a PNP transistor. In the oil pump drive circuit, NPN transistor Q1 and PNP transistor Q3 cooperate with each other to control the operating state of the power output transistor according to the instructions of the MCU, thereby realizing the control of the oil pump speed and start / stop.

[0069] The working principle of this embodiment is the same as that of Embodiment 1.

[0070] Example 10

[0071] The difference between this embodiment and embodiment 9 is that four identical nozzle drive circuits are set up, and the four nozzle drive circuits are respectively connected to the MCU.

[0072] By setting up four nozzle drive circuits, each connected to the MCU (e.g., nozzle 1, nozzle 2, nozzle 3, and nozzle 4), the MCU can independently send control signals to each nozzle drive circuit. Each nozzle drive circuit controls the opening and closing of the corresponding nozzle and the flow rate according to the received signals, enabling the system to control the operation of multiple nozzles simultaneously, meeting the flow requirements under different operating conditions and improving the system's flexibility.

[0073] The working principle of this embodiment is the same as that of Embodiment 1.

[0074] In summary, this invention, by setting up a nozzle drive circuit, an oil pump drive circuit, and a flow meter interface circuit, acquires the flow data of the injector cleaner through the flow meter interface circuit, and achieves precise control of the nozzle solenoid valve and oil pump through the nozzle drive circuit and oil pump drive circuit. Real-time processing and analysis of the flow data by the MCU adjusts the flow output of the injector cleaner, eliminating errors caused by manual observation and achieving high-precision flow measurement and automated control, thus improving the accuracy and reliability of the measurement. Furthermore, this invention allows for flexible configuration of multiple nozzle drive circuits to meet different operating conditions, enhancing the system's adaptability and flexibility. The circuit also employs components such as resistors, capacitors, and diodes for current limiting, filtering, and protection, improving the overall stability and reliability of the system.

[0075] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A mainboard for a high-speed solenoid valve flow measurement system, characterized in that, This includes an MCU, a general-purpose digital input circuit, a general-purpose digital output circuit, a nozzle drive circuit, an oil pump drive circuit, and a flow interface switching circuit; The MCU is connected to a general-purpose digital input circuit, a general-purpose digital output circuit, a nozzle drive circuit, an oil pump drive circuit, and a flow meter interface circuit, respectively. It is used for control and data processing, receiving signals from the general-purpose digital input circuit, controlling the output of the general-purpose digital output circuit, driving the nozzle and oil pump to work, and processing the flow data transmitted from the flow meter conversion circuit. A general-purpose digital input circuit, which is connected to the MCU, is used to receive digital signals input from external devices and transmit the digital signals to the MCU; A general-purpose digital output circuit, which is connected to the MCU, is used to receive digital signals output by the MCU and output digital signals to external devices; A nozzle driving circuit, which is connected to an MCU, is used to receive control signals from the MCU to control the opening and closing of the nozzle and the flow rate of the nozzle. An oil pump drive circuit is connected to an MCU and is used to drive the oil supply pump and receive instructions from the MCU to control the speed and start / stop of the oil pump. The flow meter interface circuit is connected to the MCU and is used to convert the flow signal detected by the flow meter into an electrical signal format suitable for the MCU to process, and then transmit it to the MCU.

2. The mainboard of a high-speed solenoid valve flow measurement system according to claim 1, characterized in that, It also includes a power supply circuit; the power supply circuit is connected to the MCU and is connected to an external DC power supply to power the MCU.

3. The mainboard of a high-speed solenoid valve flow measurement system according to claim 1, characterized in that, It also includes an ADC and a DAC; the ADC and DAC are respectively connected to the MCU.

4. The mainboard of a high-speed solenoid valve flow measurement system according to claim 1, characterized in that, It also includes a serial communication interface; the serial communication interface is connected to the MCU and provides the MCU with an interface for data communication with other devices or systems.

5. The mainboard of a high-speed solenoid valve flow measurement system according to claim 1, characterized in that, The nozzle driving circuit includes resistors R8, R9, R10, and R11, an optocoupler U3, transistors Q4 and Q6, a power output transistor Q5, and diodes D4, D5, and D6. The input terminal of optocoupler U3 is connected to the power supply and resistor R10. The first terminals of transistors Q4 and Q6 are respectively connected to the output terminal of optocoupler U3, the second terminal of transistor Q4 is connected to one end of nozzle L1, and the third terminal of transistor Q6 is connected to the output terminal of optocoupler U3. The output terminals are connected as follows: one end of resistor R9 is connected to the third terminal of transistor Q4 and the second terminal of transistor Q6, and the other end is connected to the first terminal of power output transistor Q5. The second terminal of power output transistor Q5 is connected to the other end of nozzle L1; one end of resistor R11 is connected to the third terminal of power output transistor Q5, and the other end is grounded; resistor R8 is connected in parallel with transistor Q4; diode D5 is connected in parallel with resistor R9; diodes D4 and D6 are connected in parallel with power output transistor Q5.

6. The mainboard of a high-speed solenoid valve flow measurement system according to claim 1, characterized in that, The oil pump drive circuit includes resistors R1, R3, R6, and R7, an optocoupler U1, transistors Q1 and Q3, a power output transistor Q2, and diodes D1 and D2. The input terminal of optocoupler U1 is connected to the power supply and resistor R6. The first terminals of transistors Q1 and Q3 are respectively connected to the output terminals of optocoupler U1, the second terminal of transistor Q1 is connected to one end of oil pump B1, and the third terminal of transistor Q3 is connected to the output terminal of optocoupler U1. One end of resistor R3 is connected to both the third and second terminals of transistors Q1 and Q3, and the other end is connected to the first terminal of power output transistor Q2. The second terminal of power output transistor Q2 is connected to the other end of oil pump B1. One end of resistor R7 is connected to the third terminal of power output transistor Q2, and the other end is grounded. Resistor R1 is connected in parallel with transistor Q1. Diode D1 is connected in parallel with resistor R3. Diode D2 is connected in parallel with oil pump B1.

7. The mainboard of a high-speed solenoid valve flow measurement system according to claim 1, characterized in that, The flowmeter interface circuit includes resistors R2, R4, and R5, capacitors C1 and C2, diode D3, and optocoupler U2. The input terminal of optocoupler U2 is connected to the power supply and resistor R2. One end of resistor R4 is connected to both the power supply and the output terminal of optocoupler U2, and the other end is connected to both resistor R5 and the output terminal of optocoupler U2. The other end of resistor R5 is connected to the signal output terminal. One end of capacitor C1 is connected to the output terminal of optocoupler U2, and the other end is grounded. One end of capacitor C2 is connected to resistor R5, and the other end is grounded. Diode D3 is connected in parallel with the input terminal of optocoupler U2.

8. The mainboard of a high-speed solenoid valve flow measurement system according to claim 5, characterized in that, Transistor Q4 is an NPN transistor, and transistor Q6 is a PNP transistor.

9. The mainboard of a high-speed solenoid valve flow measurement system according to claim 6, characterized in that, Transistor Q1 is an NPN type transistor, and transistor Q3 is a PNP type transistor.

10. The mainboard of a high-speed solenoid valve flow measurement system according to claim 1, characterized in that, Four identical nozzle drive circuits are set up, and each of the four nozzle drive circuits is connected to the MCU.

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