Diesel-driven air compressor unit control device with electric air inlet valve control function

Abstract

The utility model provides a diesel-driven air compressor unit control device with an electric air inlet valve control function, which comprises an embedded microprocessor and an electric air inlet valve control circuit connected with the embedded microprocessor, and the electric air inlet valve control circuit comprises a signal isolation circuit, a digital-to-analog conversion circuit and an output circuit. The signal isolation circuit is connected with an output pin of the embedded microprocessor and is used for receiving a digital signal output by the embedded microprocessor; and the digital-to-analog conversion circuit is connected with the output pin of the isolation chip and is used for converting the digital signal forwarded by the signal isolation circuit into an analog signal and inputting the analog signal to the control end of the electric air inlet valve through the output circuit. Therefore, the diesel-driven air compressor unit control device provided by the utility model has an electric air inlet valve control function and can drive the electric air inlet valve to open at a corresponding angle.

Description

Technical Field

[0001] The utility model relates to a control device for a diesel-driven air compressor unit, and more specifically, to a control device for a diesel-driven air compressor unit with an electric intake valve control function. Background Art

[0002] The diesel-driven air compressor unit mainly includes three major parts: a diesel engine, a screw compressor, and a control system. In addition, there are supporting devices such as a chassis, a radiator water tank and a fan, an intake valve, and a lubrication system. The air compressor is directly connected to the diesel engine through a screw shaft and is jointly installed on a channel steel chassis; the diesel engine drives the rotation of the screw compressor rotor to compress air to a certain pressure. The diesel-driven air compressor unit is mainly widely used in industries such as mines, water conservancy, transportation, shipbuilding, urban construction, energy, and the military. With the wide application of diesel-driven air compressors, the proportion of stable, reliable, energy-saving and environmentally friendly diesel-driven air compressors is increasing.

[0003] The control system of the diesel-driven air compressor unit is an important part of the air compressor system, mainly used to control and manage the operation of the diesel-driven air compressor unit, including speed regulation function, communication and remote control function, detection function, etc. It should be noted that the traditional mechanical control system of the diesel-driven air compressor unit has been gradually replaced by the electric control system of the diesel-driven air compressor unit due to problems such as single function, instability, response lag, poor adaptability, and high fuel consumption. For example, the Chinese patent with the application number 202120976929.3 discloses an electric control cabinet suitable for CAN speed regulation of a diesel-driven screw air compressor.

[0004] It should be noted that the electric intake valve is a key component in the air compressor, mainly used to control the intake air volume of the air compressor. At present, the traditional mechanical intake valve adjustment method is mainly adopted; in the electric control system of the diesel-driven air compressor unit, how to achieve precise control of the electric intake valve is crucial for ensuring the stable operation and optimizing the performance of the air compressor.

[0005] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the Invention

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art, and thus provide a control device for a diesel-driven air compressor unit with an electric intake valve control function.

[0007] To achieve the above object, the present utility model provides a control device for a diesel-driven air compressor unit with an electric intake valve control function, which includes an embedded microprocessor and an electric intake valve control circuit connected to the embedded microprocessor. The electric intake valve control circuit includes a signal isolation circuit, a digital-to-analog conversion circuit, and an output circuit. Among them, the signal isolation circuit includes an isolation chip, the digital-to-analog conversion circuit includes a digital-to-analog conversion chip, and the output circuit includes a signal amplifier and a voltage regulator. The input pin of the isolation chip is connected to the output pin of the embedded microprocessor through a corresponding inductor for receiving the digital signal output by the embedded microprocessor. The input pin of the digital-to-analog conversion chip is connected to the output pin of the isolation chip for converting the digital signal forwarded by the signal isolation circuit into an analog signal. The output pin of the digital-to-analog conversion circuit is connected to the input end of the output circuit, and the output end of the output circuit is used to connect to the corresponding control end of the electric intake valve.

[0008] The beneficial effects of the present utility model are as follows:

[0009] The present utility model provides a new control device for a diesel-driven air compressor unit with an electric intake valve control function, which has high stability and fast response. By forwarding the digital signal output by the embedded microprocessor through the signal isolation circuit, the stability and safety of the circuit can be ensured. By converting the digital signal into an analog signal recognizable by the electric intake valve through the digital-to-analog conversion circuit. Through the output circuit, the analog signal is amplified, and a control signal that can drive the electric intake valve to open at a corresponding angle is output. Description of the Drawings

[0010] Figure 1 is a schematic structural diagram of the control device for a diesel-driven air compressor unit with an electric intake valve control function in Embodiment 1;

[0011] Figure 2 is a circuit schematic diagram of the electric intake valve control circuit of the present utility model;

[0012] Figure 3 is a circuit schematic diagram of the power management circuit of the present utility model;

[0013] Figure 4 is a circuit schematic diagram of the color screen display circuit of the present utility model;

[0014] Figure 5 is a circuit schematic diagram of the data import / export circuit of the present utility model;

[0015] Figure 6 is a schematic structural diagram of the control device for a diesel-driven air compressor unit with an electric intake valve control function in Embodiment 7. Detailed Embodiments

[0016] The following is a further detailed description of the technical solution of the present utility model through specific embodiments.

[0017] The terms "first", "second", etc. in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing objects with the same attributes when describing the embodiments of this application.

[0018] Embodiment 1

[0019] This embodiment provides a specific implementation of a control device for a diesel-driven air compressor unit with an electric intake valve control function;

[0020] As shown in the attached Figure 1 figure, the control device for the diesel-driven air compressor unit with an electric intake valve control function includes an embedded microprocessor MCU and an electric intake valve control circuit connected to the embedded microprocessor MCU. The electric intake valve control circuit includes a signal isolation circuit, a digital-to-analog conversion circuit, and an output circuit. Among them, the signal isolation circuit includes an isolation chip, the digital-to-analog conversion circuit includes a digital-to-analog conversion chip, and the output circuit includes a signal amplifier and a voltage regulator;

[0021] As shown in the attached Figure 2 figure, the input pin of the isolation chip is connected to the output pin of the embedded microprocessor MCU through a corresponding inductor, and is used to receive the digital signal output by the embedded microprocessor MCU and forward it to the digital-to-analog conversion chip;

[0022] The input pin of the digital-to-analog conversion chip is connected to the output pin of the isolation chip, and is used to convert the digital signal forwarded by the signal isolation circuit into an analog signal;

[0023] The output pin of the digital-to-analog conversion circuit is connected to the input end of the output circuit, and the output end of the output circuit is used to connect the corresponding electric intake valve control end.

[0024] As shown in the attached Figure 2 figure, the signal isolation circuit includes an isolation chip U14, and inductors L27, L17, L18, L20, L21. The digital-to-analog conversion circuit includes a digital-to-analog conversion chip U12 and capacitors C124, C127, C128, C129, and resistor R147; the signal amplifier in the output circuit includes a bipolar transistor Q12, resistors R146, capacitors C125, C126, and the voltage regulator in the output circuit includes a diode D48, an inductor L19, and a zener diode D49;

[0025] As shown in the attachedFigure 2 As shown, the VIA, VIB, VIC, and COD pins of the isolation chip U14 are connected to the pins C1_D / A_CLK, C1_D / A_CSG, C1_D / A_OUT, and C1_D / A_IN of the embedded microprocessor MCU through inductors L17 to L21; the pins SCLK, CSB, SDO, and SDI of the digital-to-analog conversion chip U12 are connected to the pins VOA, VOB, VID, and VOC of the isolation chip U14; the output pins IO1+ and IO1- of the output circuit are used to connect to the corresponding control terminals of the electric intake valve respectively;

[0026] The digital signal of the embedded microprocessor MCU is output to the isolation chip U14, and the isolation chip U14 then outputs the digital signal to the digital-to-analog conversion chip U12; the digital-to-analog conversion chip U12 converts the digital signal forwarded by the signal isolation circuit into a very small analog quantity; the digital-to-analog conversion chip U12 externally connects the bipolar transistor Q12 in the output circuit to amplify the current to obtain a 4 to 20 mA signal;

[0027] It should be noted that in the electric intake valve control circuit, the output terminal of the output circuit is directly connected to the electric intake valve. When the embedded microprocessor MCU outputs a fixed data, the electric intake valve control circuit outputs a corresponding current signal to the electric intake valve. Therefore, in this embodiment, a 4 - 20 mA signal can be directly output through the hardware circuit to drive the electric intake valve to open a fixed angle, thereby effectively controlling the intake volume of the air compressor intake valve and realizing the stable and reliable use of the diesel-driven air compressor unit.

[0028] As shown in the appendix Figure 3 As shown, the chip U11 in the power management circuit converts the common 5V into ±12V power supplies, and then converts the 12V into 3.3V through the chip U13. The ±12V powers the output circuit, and the 3.3V powers the digital-to-analog conversion chip U12 and the isolation chip U14;

[0029] The power management circuit further includes capacitors C150, C151, C115, C117, C116, C120, C123, C118, C119, C121, C152, the isolation boost chip U11, and the buck voltage regulator chip U13. One end of the capacitors C150 and C151 is connected to 5V, and the other end is connected to GND. The capacitors C150 and C151 are also connected in parallel to the +Vin terminal and -Vin terminal of the U11 isolation boost chip. One end of the capacitors C115, C117, C116, and C120 is connected to the +Vo of U11 and is also connected to the In pin of the buck voltage regulator chip U13, and the other end is connected to 0V. One end of the capacitors C123, C118, C119, C121, and C152 is connected to the OUT terminal of U13, and the other end is connected to GND.

[0030] In a specific embodiment, the isolation chip U14 is of the model ISO7641, the digital-to-analog conversion chip U12 is of the model DAC161S997, and the embedded microprocessor MCU is of the model GD32F450ZGT6.

[0031] Embodiment 2

[0032] Based on Embodiment 1, this embodiment provides another specific implementation of a control device for a diesel-driven air compressor unit with an electric intake valve control function;

[0033] The control device for a diesel-driven air compressor unit with an electric intake valve control function further includes a color screen display circuit connected to the embedded microprocessor MCU, and the color screen display circuit is also connected to a display screen.

[0034] As shown in the attachment Figure 4 One end of the color screen display circuit is connected to the control pins (LTDC-R0 to LTDC-R7, LTDC-G0 to LTDC-G7, and LTDC-B0 to LTDC-B7) of the embedded microprocessor MCU, and the other end of the color screen display circuit is connected to a 4.3-inch color screen liquid crystal; through the RGB color driving port of the embedded microprocessor MCU, the operating data, alarm data, configuration parameters and other real-time data of the air compressor unit are displayed on the screen, and the color graphical interface display makes the data display more intuitive and has a better human-computer interaction function.

[0035] In some embodiments, the model of the display screen is TM043. It can be understood that the display resolution of the display screen is 480x272, sampling RGB565 color display, the interface color is bright, the backlight brightness is adjustable, and there are optional interface operations in Chinese, English and other multiple languages. The interface adopts a graphical design, and the operation and status information are displayed intuitively and clearly, which is very convenient for operators to use.

[0036] Embodiment 3

[0037] Based on the above embodiments, this embodiment provides another specific implementation of a control device for a diesel-driven air compressor unit with an electric intake valve control function;

[0038] The control device for a diesel-driven air compressor unit with an electric intake valve control function further includes a data import / export circuit connected to the embedded microprocessor MCU, and the data import / export circuit includes a USB interface circuit.

[0039] As shown in the attachment Figure 5As shown in the figure, the data import / export circuit is connected to the embedded microprocessor MCU through U9 (a power switch chip with single-channel overcurrent and short-circuit protection) to control the power supply to VBUS of the USB interface circuit and realize the power supply to external devices. The USB_HOUT_DM pin of the embedded microprocessor MCU is also connected to one end of the R216 resistor, and the other end of the resistor is connected to U8, and U8 is connected to the DM terminal on the USB host interface socket J2. Similarly, the USB_HOUT_DP pin of the embedded microprocessor MCU is connected to one end of the R218 resistor, and the other end of the resistor is connected to U8, and U8 is connected to the DP terminal on the USB host interface socket J2. When the embedded microprocessor MCU detects that a USB flash drive is inserted into the USB host interface socket J2, it can export the operating data and historical records of the air compressor to the USB flash drive through instructions. When the embedded microprocessor MCU detects a data reading instruction, it can read the configuration parameters, etc. in the USB flash drive into the embedded microprocessor MCU to update the settings and operating parameters of the air compressor.

[0040] It should be noted that the data import / export circuit can export the operating data and historical records of the air compressor to the USB flash drive, and can also read the configuration parameters, etc. in the USB flash drive into the embedded microprocessor MCU to update the settings and operating parameters of the air compressor. Since the internal EEPROM storage space of the device is limited, by externally inserting a USB flash drive into the data import / export circuit, the data is stored in the USB flash drive to record more data and imported into the computer, which is convenient for analyzing the data changes during operation, analyzing the operating data, analyzing the cause of faults, and optimizing the control strategy.

[0041] Embodiment 4

[0042] Based on the above embodiments, this embodiment provides another specific implementation manner of a control device for a diesel-driven air compressor unit with an electric intake valve control function;

[0043] The control device for the diesel-driven air compressor unit with an electric intake valve control function further includes a key circuit connected to the embedded microprocessor MCU, and the key circuit includes a stop key circuit, a start key circuit, a load key circuit, and an unload key circuit.

[0044] It can be understood that the key circuit is connected to the input pin of the embedded microprocessor MCU to achieve human-machine interaction and control the starting, stopping, loading, and unloading of the diesel engine. It should be noted that the circuit structures of the stop key circuit, the start key circuit, the loading key circuit, and the unloading key circuit are the same, and each includes a key switch and a first resistor. The +5V voltage is connected to one end of the first resistor through the key switch, and the other end of the first resistor is connected to the input pin of the embedded microprocessor MCU. A second resistor and a second capacitor are also connected in parallel between the other end of the first resistor and the ground terminal. The specific circuit structure will not be elaborated here.

[0045] Embodiment 5

[0046] Based on the above embodiments, this embodiment provides another specific implementation manner of a control device for a diesel-driven air compressor unit with an electric intake valve control function;

[0047] The control device for the diesel-driven air compressor unit with an electric intake valve control function further includes a CAN communication interface circuit and a relay output circuit connected to the embedded microprocessor.

[0048] It should be noted that the CAN communication interface circuit uses an MCAN chip to control the engine speed regulation, achieve energy-saving speeds under different target pressures, and effectively reduce the energy consumption of the diesel engine; the relay output circuit is connected to the output pin of the embedded microprocessor MCU to realize the start-stop control and loading / unloading control of the air compressor unit.

[0049] In a specific implementation manner, the relay output circuit includes a triode Q1, a diode, and a relay switch. The base of the triode Q1 is connected to the output pin of the embedded microprocessor MCU through a resistor, the emitter of the triode Q1 is grounded, the collector of the triode Q1 is connected to one end of the control coil of the relay switch, the diode is connected in parallel between both ends of the control coil of the relay switch, and the moving contact and the static contact of the relay switch are used to connect external devices.

[0050] It should also be noted that the circuit structure of the CAN communication interface circuit is prior art, so the specific circuit structure will not be elaborated here.

[0051] Embodiment 6

[0052] Based on the above embodiments, this embodiment provides another specific implementation manner of a control device for a diesel-driven air compressor unit with an electric intake valve control function;

[0053] The control device of the diesel-driven air compressor unit with an electric intake valve control function further includes an exhaust pressure detection circuit connected to the embedded microprocessor. The exhaust pressure detection circuit is used to connect to the input pin of the embedded microprocessor and an exhaust pressure sensor (an external device provided by the user).

[0054] It should be noted that the exhaust pressure detection circuit is used to feedback and adjust the magnitude of the output current of the electric intake valve control circuit in real time, so that the embedded microprocessor MCU adjusts different current values output by the electric intake valve control circuit according to the air compressor exhaust pressure value detected by the exhaust pressure detection circuit in real time. For example, when the detected exhaust pressure is greater than the set pressure value, the valve opening is reduced to reduce the intake air volume; when the detected exhaust pressure is less than the set pressure value, the valve opening is increased to increase the intake air volume. By detecting the exhaust pressure, the electric intake valve control circuit outputs corresponding current values in real time to accurately adjust the opening of the intake valve in real time, effectively solving the problems of lag in mechanical intake valve adjustment and overshoot, and at the same time solving the problems of frequent loading and unloading of the mechanical valve when the gas consumption is small, and high fuel consumption and resource waste caused by high intake air volume at low pressure requirements.

[0055] Embodiment 7

[0056] Based on the above embodiments, this embodiment gives another specific implementation manner of the control device of the diesel-driven air compressor unit with an electric intake valve control function;

[0057] As shown in the appendix Figure 6 The control device of the diesel-driven air compressor unit with an electric intake valve control function further includes an alarm protection output circuit connected to the embedded microprocessor MCU. The alarm protection output circuit is connected to the output pin of the embedded microprocessor MCU and is used to output an alarm status.

[0058] It should be noted that the alarm protection output circuit is used to output an alarm status to protect the operation of the air compressor unit; the circuit structure of the alarm protection output circuit is the same as that of the relay output circuit, so it will not be elaborated here. The moving contact and static contact of the relay switch in the alarm protection output circuit are used to connect external alarm devices.

[0059] In some embodiments, the control device of the diesel-driven air compressor unit with an electric intake valve control function further includes an EEPROM storage circuit. The EEPROM storage circuit is connected to the embedded microprocessor MCU through the SPI bus and is used to store various speed regulation parameters and operation parameters including operation configuration parameters.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A diesel-driven air compressor unit control device with electric intake valve control function, characterized in that: It includes an embedded microprocessor and an electric intake valve control circuit connected to the embedded microprocessor, wherein the electric intake valve control circuit includes a signal isolation circuit, a digital-to-analog conversion circuit and an output circuit, wherein the signal isolation circuit includes an isolation chip, the digital-to-analog conversion circuit includes a digital-to-analog conversion chip, and the output circuit includes a signal amplifier and a voltage regulator; The input pin of the isolation chip is connected to the output pin of the embedded microprocessor through a corresponding inductor, so as to receive a digital signal output by the embedded microprocessor; The input pin of the digital-to-analog conversion chip is connected to the output pin of the isolation chip, and is used to convert the digital signal forwarded by the signal isolation circuit into an analog signal; The output pin of the digital-to-analog conversion circuit is connected to the input end of the output circuit, and the output end of the output circuit is used to connect to the corresponding electric intake valve control end.

2. The diesel-driven air compressor unit control device with electric intake valve control function according to claim 1 is characterized in that: It also includes a color screen display circuit connected to the embedded microprocessor, and the color screen display circuit is also connected to the display screen.

3. The diesel-driven air compressor unit control device with electric intake valve control function according to claim 2 is characterized in that: The model of the display screen is TM043.

4. The diesel-driven air compressor unit control device with electric intake valve control function according to any one of claims 1 to 3, characterized in that: It also includes a data import and export circuit connected to the embedded microprocessor, and the data import and export circuit includes a USB interface circuit.

5. The diesel-driven air compressor unit control device with electric intake valve control function according to claim 4 is characterized in that: It also includes a key circuit connected to the embedded microprocessor, and the key circuit includes a stop key circuit, a start key circuit, a load key circuit and an unload key circuit.

6. The diesel-driven air compressor unit control device with electric intake valve control function according to claim 4 is characterized in that: It also includes a CAN communication interface circuit and a relay output circuit connected to the embedded microprocessor.

7. The diesel-driven air compressor unit control device with electric intake valve control function according to claim 4 is characterized in that: It also includes an exhaust pressure detection circuit connected to the embedded microprocessor, and the exhaust pressure detection circuit is used to connect the input pin of the embedded microprocessor and the exhaust pressure sensor respectively.

8. The diesel-driven air compressor unit control device with electric intake valve control function according to claim 4 is characterized in that: It also includes an alarm protection output circuit connected to the embedded microprocessor, wherein the alarm protection output circuit is connected to an output pin of the embedded microprocessor and is used to output an alarm state.

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