Intelligent multi-parameter monitoring controller for fluid pump

Abstract

According to the intelligent multi-parameter monitoring controller for the fluid pump, the MCU of a plurality of external differential input channels is supported on the basis of an internal ADC to achieve the control module U1, the MEMS sensors are directly connected with the control module U1, voltage signals or current signals collected by the MEMS sensors are directly sent into the control module U1, and the control module U1 is connected with the control module U1. The control module U1 generates corresponding analog signals according to electric signals transmitted by each MEMS sensor, an independent ASIC or MCU does not need to be configured for each MEMS sensor, the electric signals of the sensors can be processed through the MCU chip of the control module U1, control over the fluid pump can be achieved, and the overall cost of the controller is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sensors, and in particular to an intelligent multi-parameter monitoring controller for a fluid pump. Background Art

[0002] A fluid pump is a device used to move fluid (gas or liquid) from one location to another. It achieves fluid delivery by increasing the pressure of the fluid. Fluid pumps are widely used in industry, agriculture, construction, medical care and daily life. They are used for liquid delivery such as water supply, irrigation, pressurization, circulation, and sewage discharge, or gas delivery such as ventilators and air pumps. In some complex scenarios, fluid pumps need to refer to the fluid parameters of the fluid, such as pressure, flow, temperature and the operating parameters of the fluid pump (such as operating current) to control the fluid pump. These fluid parameters are usually measured by dedicated sensors.

[0003] The structure of conventional commercial sensor modules currently used in the market is: "1 MEMS sensor + 1 ASIC / MCU + 1 or more parameter output pins". The current signal or voltage signal collected by the MEMS sensor is calibrated by the ASIC or MCU set inside the sensor module to become an accurate analog signal / digital signal, and then sent to the outside of the sensor through the output pin to be converted or read by the external ADC / MCU. For example, the patent with application number CN201620556192.9 discloses a water pump controller with motor online insulation monitoring function. Figure 1 It can be seen that it uses a current sensor and a voltage sensor at the same time. The signal output end of the voltage sensor and the signal output end of the current sensor are respectively connected to the signal input end of the analog-to-digital converter, that is, the two sensors output analog signals calibrated by the ASIC inside the sensor module, and then send the analog signals out of the sensor module, and after being converted into digital signals by the external analog-to-digital converter ADC, they are sent to the microcontroller to control the start and stop of the motor.

[0004] When it is necessary to measure the physical quantity parameter values ​​of multiple fluid parameters, multiple sensor modules of the structure of "1 MEMS sensor + 1 ASIC / MCU + 1 or more parameter output pins" are required, which is undoubtedly a considerable cost. In view of the above situation, how to simultaneously detect the physical quantity parameter values ​​of multiple external gases or liquids at a lower cost and achieve accurate control of the operating status of external devices has become a technical problem that needs to be solved in this field. Summary of the invention

[0005] In order to solve the problem of high cost of technical solutions based on multiple sensors to control fluid equipment in the prior art, the present invention provides an intelligent multi-parameter monitoring controller for a fluid pump, which can achieve precise control of the fluid pump based on multiple MEMS sensors at a relatively low cost.

[0006] The technical solution of the present invention is as follows: an intelligent multi-parameter monitoring controller for a fluid pump, characterized in that it comprises: Fluid parameter physical quantity input mechanism, control module U1 and fluid pump operation regulator; The control module U1 is implemented based on an MCU whose internal ADC supports multiple pairs of external differential input channels; The fluid parameter physical quantity input mechanism includes: a MEMS sensor for monitoring the fluid parameter for reference when the fluid pump is running; the number of the MEMS sensors is greater than or equal to 1; each MEMS sensor is arranged at a corresponding detection position on the monitored fluid pump, and all the MEMS sensors are electrically connected to the control module U1, and the MEMS sensors convert the detected parameter physical quantity into an electrical signal and directly input it into the control module U1; The control module U1 receives all the fluid parameter electrical signals collected by the MEMS sensor, converts them into corresponding ADC values ​​based on the internal ADC module, generates a control signal, and sends it to the fluid pump operation regulator; The fluid pump operation regulator is electrically connected to the monitored fluid pump and controls the operation of the monitored fluid pump based on the control signal.

[0007] It is further characterized by: The MEMS sensors in the fluid parameter physical quantity input mechanism include: a pressure sensor S1, a flow sensor S2, a temperature sensor S3 and a current sensor S4; The fluid pump operation regulator includes: an NMOS tube Q2, an optical coupler OP1, an insulated gate bipolar transistor Q1, a double-pole double-throw relay K1, an external power supply interface RS3 and a fluid pump speed adjustment interface RS4; the fluid pump speed adjustment interface RS4 is connected to the power supply input interface of the fluid pump; the external power supply interface RS3 is connected to an external DC power supply; The fluid pump operation regulator also includes: resistors R3-R6, a bidirectional transient voltage suppressor D1 and a regulator power supply interface RS1; Pin 1 of the fluid pump speed regulating interface RS4 is connected to one end of the bidirectional TVS diode D1 and then to pin 3 of the double-pole double-throw relay K1; pin 2 of the fluid pump speed regulating interface RS4 is connected to the other end of the bidirectional TVS diode D1 and pin 6 of the double-pole double-throw relay K1; pin 1 of the external power interface RS3 is connected to pins 2 and 5 of the double-pole double-throw relay K1 and one end of the resistor R4; pin 2 of the external power interface RS3 is connected to the emitter E of the insulated gate bipolar transistor Q1 and pin 3 of the optocoupler OP1; Pin 1 of the double-pole double-throw relay K1 is connected to pin 4 of the control module U1, and pin 4 of the double-pole double-throw relay K1 is connected to pin 7 of the double-pole double-throw relay K1 and then connected to the collector C of the insulated gate bipolar transistor Q1; pin 8 of the double-pole double-throw relay K1 is connected to pin 1 of the control module U1; The other end of the resistor R4 is connected to the gate G of the insulated gate bipolar transistor Q1 and then to the 4th pin of the optocoupler OP1; the 1st pin of the optocoupler OP1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R5 and then to the 2nd pin of the control module U1; the 2nd pin of the optocoupler OP1 is connected to the other end of the resistor R5 and the drain D of the NMOS tube Q2; the source S of the NMOS tube Q2 is connected to one end of the resistor R6 and then to the ground, the gate G of the NMOS tube Q2 is connected to the other end of the resistor R6 and then to the 5th pin of the control module U1; Pin 1 of the regulator power interface RS1 is connected to pin 4 of the control module U1, and pin 2 of the regulator power interface RS1 is connected to pin 3 of the control module U1; The fluid pump operation regulator further includes: a bus interface RS2, which provides an interface for external data communication; pin 1 of the bus interface RS2 is connected to pin 7 of the control module U1, and pin 2 of the bus interface RS2 is connected to pin 8 of the control module U1; The fluid parameter physical quantity input mechanism also includes: decoupling capacitors C1-C4; Pin 1 of the pressure sensor S1 is connected to pin 18 of the control module U1, and pin 2 of the pressure sensor S1 is connected to one end of the capacitor C1 and pin 2 of the control module U1; pin 3 of the pressure sensor S1 is connected to pin 20 of the control module U1, pin 4 of the pressure sensor S1 is grounded, and the other end of the capacitor C1 is grounded; Pin 1 of the flow sensor S2 is connected to pin 15 of the control module U1, pin 2 of the flow sensor S2 is connected to pin 2 of the control module U1 and one end of the capacitor C2, the other end of the capacitor C2 is grounded, pin 3 of the flow sensor S2 is connected to pin 16 of the control module U1, and pin 4 of the flow sensor S2 is grounded; Pin 1 of the temperature sensor S3 is connected to pin 13 of the control module U1, pin 2 of the temperature sensor S3 is connected to pin 2 of the control module U1 and one end of the capacitor C3, the other end of the capacitor C3 is grounded, pin 3 of the temperature sensor S3 is connected to pin 14 of the control module U1, and pin 4 of the temperature sensor S3 is grounded; Pin 1 of the current sensor S4 is connected to pin 11 of the control module U1, pin 2 of the current sensor S4 is connected to pin 2 of the control module U1 and one end of the capacitor C4, the other end of the capacitor C4 is grounded, pin 3 of the current sensor S4 is connected to pin 12 of the control module U1; pin 4 of the current sensor S4 is grounded; It also includes: a decoupling capacitor C0, a power indicator light DS1, a warning light DS2, a resistor R1 and a resistor R2; The negative electrode of the power indicator light DS1 is grounded, the positive electrode of the power indicator light DS1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to pin 4 of the control module U1; The cathode of the warning light DS2 is connected to the pin 10 of the control module U1, the anode of the warning light DS2 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the pin 4 of the control module U1; Pin 3 of the control module U1 is grounded, pin 4 of the control module U1 is connected to VDD and one end of the decoupling capacitor C0, and the other end of the decoupling capacitor C0 is grounded.

[0008] The present application provides an intelligent multi-parameter monitoring controller for a fluid pump, which implements a control module U1 based on an MCU with an internal ADC supporting multiple pairs of external differential input channels, directly connects multiple MEMS sensors to the control module U1, and directly sends the voltage signal or current signal collected by the MEMS sensor to the control module U1, and the control module U1 generates a corresponding analog signal from the electrical signal transmitted by each MEMS sensor. In the present application, there is no need to configure an independent ASIC or MCU for each MEMS sensor. The MCU chip of the control module U1 can both process the sensor electrical signal and realize the control of the fluid pump, which greatly reduces the overall cost of the controller; the present application adopts a structure of multiple MEMS sensors cooperating with one control module U1, supports the simultaneous measurement of the physical values ​​of multiple fluid parameters associated with the fluid pump, and the control module U1 cooperates with the fluid pump operation regulator to use the multiple fluid parameter values ​​measured by the multiple parameter sensors to control the operation of the fluid pump in real time, which can meet the needs of precise control of the fluid pump in various scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic diagram of the system structure of an intelligent multi-parameter monitoring controller for a fluid pump; Figure 2 Control module MCU general block diagram; Figure 3 Circuit connection diagram for operating regulator for fluid pump; Figure 4 It is a schematic diagram of the circuit structure of the control module U1 and the sensor; Figure 5 This is a schematic diagram of the external connections of the intelligent multi-parameter monitoring controller for body pumps. DETAILED DESCRIPTION

[0010] like Figure 1 As shown, the present application includes an intelligent multi-parameter monitoring controller for a fluid pump, which includes: a fluid parameter physical quantity input mechanism, a control module U1 and a fluid pump operation regulator.

[0011] In this application, in order to support multiple MEMS sensor inputs at the same time, the control module U1 is implemented based on an MCU whose internal ADC supports multiple pairs of external differential input channels. Figure 2 Shown is a general block diagram of the MCU type used in this application. Figure 2Only one MEMS sensor is marked in the figure. The difference between the two pins VINP and VINN is the differential signal of the fluid parameters collected by the sensor. If there are more sensors, they can also be connected to U1 based on the same principle. MUX is the switching channel at the input end. The analog signals input by multiple MEMS are switched to a pair of differential signals based on MUX to the amplifier circuit PGA and ADC processing path. The analog signal is converted into a digital signal by the ADC, and then processed by the filter Filter and the digital signal processor DSP, and finally communicated with the outside through the bus interface Serial Interface. The control module U1 can complete the selection, amplification, AD conversion, digital quantity calibration of the electrical signal transmitted by the MEMS sensor and generate the corresponding control signal. In this application, there is no need to configure an independent ASIC or MCU for each MEMS sensor. The MCU chip of a control module U1 can not only process the electrical signals of multiple MEMS sensors and calibrate the parameters, but also realize the control of the fluid pump, which greatly reduces the overall cost of the controller.

[0012] In this embodiment, the control module U1 is implemented based on an MCU chip of model MS32F7223A0ZQ, and the MCU chip has a built-in 24-bit high-precision differential input Σ-Δ type analog-to-digital converter ADC. The working voltage of ADC is the internal LDO output voltage VLDO (which can output VDD voltage); the positive / negative input supports a total of 14 external single input channels (AN0~AN13) with differential to GND, and can also form multiple pairs of external differential input channels; built-in pre-stage gain programmable amplifier circuit PGA, high input impedance; optional reference voltage: VLDO, VLDO / 2, internal reference voltage VIR (which can be output from port VIRO), external reference voltage VER (VERI input); ADC clock: 8 / 24 frequency division of the external high-frequency clock FHCLK (8MHz); differential input amplification factor (including pre-stage PGA amplification) is 0.25 / 0.5 / 1 / 2 / 4 / 8 / 16 / 32 / 64 / 128 / 256; oversampling rate 64~32768, sampling rate 10Hz@32768~15.626KHz@64; support 50Hz / 60Hz Power frequency filter @ sampling rate = 10Hz; built-in temperature sensor, output voltage VTS can be used as the positive / negative input signal of ADC. Of course, in actual application, it can also be implemented based on other existing MCUs or ASICs with similar functions.

[0013] The fluid parameter physical quantity input mechanism includes: a MEMS sensor for monitoring the fluid parameters for reference when the fluid pump is running; the number of MEMS sensors is greater than or equal to 1; each MEMS sensor is arranged at a corresponding detection position on the fluid pump, and all MEMS sensors are electrically connected to the control module U1, and the MEMS sensor converts the detected parameter physical quantity into an electrical signal and inputs it into the control module U1.

[0014] The specific number and type of MEMS sensors are set according to actual needs. In this embodiment, the fluid pump is a fluid pump, and its corresponding sensors are: pressure sensor S1, flow sensor S2, temperature sensor S3 and current sensor S4, as shown in the figure. Figure 4 shown.

[0015] The pressure sensor S1 is arranged at the fluid outlet of the fluid pump to detect the real-time pressure of the fluid output by the fluid pump; the flow sensor S2 is arranged at the fluid outlet of the fluid pump to detect the real-time flow rate of the fluid output by the fluid pump; the temperature sensor S3 is arranged on the pump body of the fluid pump to detect the real-time temperature of the fluid pump; the current sensor S4 is arranged at the input power supply position of the fluid pump to monitor the working current of the fluid pump in real time.

[0016] In specific implementation, the EEPROM of the control module U1 stores multiple parameters of the calibration formula corresponding to each fluid parameter; the control module U1 receives the electrical signals collected by all MEMS sensors and converts them into digital quantities through ADC, calls the calibration parameters corresponding to the sensors, calculates the calibration values ​​of each physical quantity through the corresponding calibration formula, and then obtains the correct numerical values ​​corresponding to each fluid parameter. The control module judges the current operating state of the fluid pump according to the digital value of each fluid parameter, generates a control signal according to the judgment result, and sends it to the fluid pump operation regulator. The fluid pump operation regulator is electrically connected to the fluid pump, and controls the operation of the fluid pump by changing the voltage value and positive and negative of the power supply output to the fluid pump by the RS4 interface. The specific calibration method for each fluid parameter can be implemented based on the existing technology. The control module U1 uses the SCL and SDA pins of the I2C bus for programming, and sends and receives instructions and data to and from the external single-chip microcomputer MCU.

[0017] In the control module U1, it is necessary to judge the current operating state of the fluid pump according to the fluid parameter calibration value, wherein the current operating state of the fluid pump is judged. The judgment method includes: comparing the real-time fluid pressure of the fluid of the fluid pump attribute transmitted by the pressure sensor S1 with the preset fluid pressure range value to judge whether the fluid pressure exceeds the range; comparing the accumulated value or real-time value of the fluid flow value transmitted by the flow sensor S2 with the preset fluid flow range to judge whether the fluid flow exceeds the range; comparing the temperature value of the fluid pump transmitted by the temperature sensor S3 with the preset temperature range to judge whether the temperature of the temperature fluid pump exceeds the range; comparing the real-time operating current value of the fluid pump transmitted by the current sensor S4 with the preset current range to judge whether the power value exceeds the range.

[0018] The specific preset range values ​​of each parameter can be obtained by referring to the specification of the fluid pump. For example, according to the provisions of the equipment specification, the allowable operating current range of the fluid pump is 1A~2A. If the real-time operating current value transmitted by the current sensor S4 exceeds this range, the equipment needs to be stopped immediately to prevent damage to the equipment. The specific implementation method can be implemented based on the existing technology.

[0019] When the fluid pump has abnormal conditions such as overcurrent, overpressure, underpressure, overheating, etc., the parameter values ​​measured by the multi-parameter sensor are respectively expressed as excessive current, excessive pressure, too low pressure, and too high temperature. At this time, the control module U1 can stop the operation of the fluid pump in time and send an alarm message according to the set abnormal control strategy, thereby meeting the needs of various industries for precise control of fluid pumps.

[0020] The fluid pump operation regulator can be implemented based on various control circuits provided between the control module U1 and the fluid pump in the prior art. Figure 3 shown.

[0021] The fluid pump operation regulator includes: NMOS tube Q2, optocoupler OP1, insulated gate bipolar transistor (IGBT) Q1, double-pole double-throw relay K1, regulator power interface RS1, external power interface RS3, fluid pump speed adjustment interface RS4, resistors R3~R6 and bidirectional transient voltage suppressor D1.

[0022] like Figure 5 As shown, the present application provides working power VDD for the intelligent multi-parameter monitoring controller for the fluid pump of the present application through the regulator power interface RS1.

[0023] The fluid pump speed adjustment interface RS4 is connected to the power supply input interface of the fluid pump; the external power supply interface RS3 is connected to the external DC power supply VCC. The external DC power supply VCC is input by the two pins VCC_IN+ and VCC_IN- of the RS3 interface, and is set to the external power supply of the monitoring controller. The PWM signal of the control module U1 controls the on-off of the light-emitting diode of the optocoupler OP1, and then controls the on-off of the DC power supply output by the IGBT, so that the average value of the DC power supply VCC output by the two pins VCC_OUT1 and VCC_OUT2 of the RS4 interface corresponds to the duty cycle of the PWM signal, and is finally used to adjust the speed of the fluid pump. When specifically implemented in this embodiment, 12V DC power is provided based on an external battery or the like to access the external power supply interface RS3.

[0024] Pin 1 of the fluid pump speed adjustment interface RS4 is connected to one end of the bidirectional TVS diode D1 and then to pin 3 of the double-pole double-throw relay K1. Pin 2 of the fluid pump speed adjustment interface RS4 is connected to the other end of the bidirectional TVS diode D1 and pin 6 of the double-pole double-throw relay K1; Pin 1 of the external power interface RS3 is connected to pins 2 and 5 of the double-pole double-throw relay K1 and one end of the resistor R4; Pin 2 of the external power interface RS3 is connected to the emitter E of the insulated gate bipolar transistor Q1 and pin 3 of the optocoupler OP1.

[0025] Pin 1 of the double-pole double-throw relay K1 is connected to pin 4 of the control module U1, pin 4 of the double-pole double-throw relay K1 is connected to pin 7 of the double-pole double-throw relay K1 and then connected to the collector C of the insulated gate bipolar transistor Q1; pin 8 of the double-pole double-throw relay K1 is connected to pin 1 of the control module U1.

[0026] The other end of the resistor R4 is connected to the gate G of the insulated gate bipolar transistor Q1 and then to the 4th pin of the optocoupler OP1; the 1st pin of the optocoupler OP1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R5 and then to the 2nd pin of the control module U1; the 2nd pin of the optocoupler OP1 is connected to the other end of the resistor R5 and the drain D of the NMOS tube Q2; the source S of the NMOS tube Q2 is connected to one end of the resistor R6 and then to the ground, the gate G of the NMOS tube Q2 is connected to the other end of the resistor R6 and then to the 5th pin of the control module U1.

[0027] Pin 1 of the regulator power interface RS1 is connected to pin 4 of the control module U1, and pin 2 of the regulator power interface RS1 is connected to pin 3 of the control module U1.

[0028] The fluid pump operation regulator also includes: a bus interface RS2, which provides an interface for external data communication. The two pins of the RS2 interface are respectively connected to the SCL (clock input pin of the I2C bus) and SDA (data input and output pin of the I2C bus) signals of the I2C bus. Pin 1 of the bus interface RS2 is connected to pin 7 of the control module U1, and pin 2 of the bus interface RS2 is connected to pin 8 of the control module U1. When data communication with external equipment is required, data communication is performed based on the bus interface RS2. For example, in this embodiment, a calibration procedure needs to be performed for each parameter in the control module. The calibration system can be connected through the bus interface RS2 to transfer the calibration parameters to the control module U1 to implement the calibration process.

[0029] The fluid parameter physical quantity input mechanism also includes: decoupling capacitors C1~C4; pin 1 of the pressure sensor S1 is connected to pin 18 of the control module U1, and pin 2 of the pressure sensor S1 is connected to one end of the capacitor C1 and pin 2 of the control module U1; pin 3 of the pressure sensor S1 is connected to pin 20 of the control module U1, pin 4 of the pressure sensor S1 is grounded, and the other end of the capacitor C1 is grounded.

[0030] Pin 1 of the flow sensor S2 is connected to pin 15 of the control module U1, pin 2 of the flow sensor S2 is connected to pin 2 of the control module U1 and one end of the capacitor C2, the other end of the capacitor C2 is grounded, pin 3 of the flow sensor S2 is connected to pin 16 of the control module U1, and pin 4 of the flow sensor S2 is grounded.

[0031] Pin 1 of the temperature sensor S3 is connected to pin 13 of the control module U1, pin 2 of the temperature sensor S3 is connected to pin 2 of the control module U1 and one end of the capacitor C3, the other end of the capacitor C3 is grounded, pin 3 of the temperature sensor S3 is connected to pin 14 of the control module U1, and pin 4 of the temperature sensor S3 is grounded.

[0032] Pin 1 of the current sensor S4 is connected to pin 11 of the control module U1, pin 2 of the current sensor S4 is connected to pin 2 of the control module U1 and one end of the capacitor C4, the other end of the capacitor C4 is grounded, pin 3 of the current sensor S4 is connected to pin 12 of the control module U1; pin 4 of the current sensor S4 is grounded.

[0033] When the control module U1 makes the CTRL_PWR pin output a high level, the G pole of the NMOS tube Q2 is at a high level, and its S pole and D pole are turned on; at this time, no matter whether the level of the CTRL_PWM pin is high or low, the cathode of the input end of the optocoupler OP1 is always at a low level, the light-emitting diode of the optocoupler OP1 works, and the output end is connected; in this case, the pressure difference at both ends of the RS4 interface is always 0, and the fluid pump does not work.

[0034] When the control module U1 makes the CTRL_PWR pin low, the G pole of Q2 is low, and its S pole and D pole are disconnected; at this time, the level of the cathode of the input end of the optocoupler OP1 is determined by the level of the CTRL_PWM pin. In this case, the output voltage difference at both ends of the RS4 interface is controlled by the CTRL_PWM pin.

[0035] Once some situations occur that require the fluid pump to be shut down, for example: the fluid pressure value detected by the control module U1 does not match the current value, and the current value of the fluid pump obviously exceeds the normal range, the control module U1 makes the CTRL_ALARM pin output a low level and lights up the alarm LED; at the same time, when the CTRL_PWR pin outputs a high level, the fluid pump stops running.

[0036] based on Figure 3 The circuit shown can directly reduce the average voltage of the DC power supply output by RS4 through the PWM signal CTRL_PWM to control the fluid pump to stop. In most MCUs, the minimum duty cycle of the PWM signal cannot be set to 0%, but at least a value slightly greater than 0%. Similarly, the minimum duty cycle of the PWM signal CTRL_PWM in the technical solution of the present application is at least slightly greater than 0, so the average voltage of the DC power supply output by RS4 controlled by CTRL_PWM will also be slightly greater than 0, which is not necessarily sufficient to ensure that the fluid pump stops completely. Therefore, NMOS tube Q2 is set in the present application. When the fluid pump needs to stop completely, it is necessary to use the CTRL_PWR signal to turn off the light-emitting end of the optocoupler, so that the voltage of the DC power supply output by RS4 is 0, ensuring that the fluid pump can be quickly controlled to stop.

[0037] At the same time, the technical solution of the present application also supports the control of the speed and rotation direction of the fluid pump, and can be used selectively according to the needs of specific scenarios.

[0038] When the control module U1 makes the CTRL_PWM pin output a high level, there is no voltage difference at the input end of the optocoupler OP1, its light-emitting diode is turned off, and the output end is disconnected; at this time, the G pole of IGBT Q1 is at a high level, the E pole of Q1 is connected to the C pole, and the voltage difference at both ends of the RS4 interface is equal to the voltage difference at both ends of the RS3 interface. When the CTRL_PWM pin outputs a low level, there is a voltage difference at the input end of the optocoupler OP1, the light-emitting diode works, and the output end is connected; the G pole of IGBT Q1 is at a low level, the E pole of Q1 is disconnected from the C pole, and the voltage difference at both ends of the RS4 interface is 0. The single-chip microcomputer MCU makes the CTRL_PWM pin send PWM signals with different duty cycles at a certain frequency as needed, and the average voltage corresponding to the duty cycle can be obtained at both ends of the RS4 interface, thereby adjusting the speed of the fluid pump. The specific control method of PWM signals with different duty cycles can be implemented based on the control method of the MS32F7223A0ZQ MCU chip.

[0039] When the MCU makes the CTRL_MOTOR_REV pin output a high level, there is no pressure difference across the electromagnetic coil of the double-pole double-throw relay K1, the contacts do not move, and the normally closed contacts are closed. At this time, the VCC_OUT1 and VCC_OUT2 of the RS4 interface are respectively connected to the positive and negative ends of the DC power supply VCC after the IGBT Q1 voltage regulation, and the fluid pump rotates forward. When the CTRL_MOTOR_REV pin outputs a low level, there is a voltage difference across the electromagnetic coil of the double-pole double-throw relay K1, and the current in the coil will generate a magnetic field. This magnetic field will attract the armature, causing the armature to overcome the spring force and move, thereby causing the normally open contacts to close. At this time, the VCC_OUT1 and VCC_OUT2 of the RS4 interface are respectively connected to the negative and positive ends of the DC power supply after the IGBT Q1 voltage regulation, and the fluid pump reverses.

[0040] In order to be more practical, the present application also provides: a power indicator light DS1 and a warning light DS2. The negative pole of the power indicator light DS1 is grounded, the positive pole of the power indicator light DS1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to pin 4 of the control module U1. The negative pole of the warning light DS2 is connected to pin 10 of the control module U1, the positive pole of the warning light DS2 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to pin 4 of the control module U1. When an alarm occurs, the MCU makes CTRL_ALARM output a low level, and the alarm LED is lit.

[0041] Pin 3 of the control module U1 is grounded, pin 4 of the control module U1 is connected to VDD and one end of a decoupling capacitor C0, and the other end of the decoupling capacitor C0 is grounded.

[0042] The technical solution of the present application can receive external instructions or data information in real time through the linkage action between the modules set up, realize simultaneous or time-sharing measurement of the pressure / flow / temperature / current physical quantities of the fluid pump, and obtain the calibrated pressure / flow / temperature / current physical quantity values; according to the set control rules, the measured values ​​of each physical quantity can be used as control parameters to control the speed of the fluid pump and switch the fluid pump to forward or reverse rotation; when the temperature or power supply current of the fluid pump is abnormal, the alarm LED light can be turned on to stop the operation of the fluid pump.

[0043] Since the polarity of the DC power supplies VCC_OUT1 and VCC_OUT2 connected to the DC motor of the fluid pump is uncertain, a bidirectional TVS diode D1 is connected in parallel at both ends of the RS4 interface to release the back EMF current generated when the motor stops. When the motor stops and generates back EMF, if the back EMF is too large, the bidirectional TVS diode can conduct in any direction. Therefore, regardless of the polarity of the back EMF generated by the motor, once its forward or reverse voltage exceeds the breakdown voltage of the TVS diode, the diode will conduct, providing a discharge path to absorb the back EMF current, thereby protecting the motor front-end circuit from damage caused by excessive back EMF.

[0044] The intelligent multi-parameter monitoring controller of the present application has a 5V or 3.3V dual power supply mode. It adopts PCBA packaging, which is easy to install and simple to operate. It has many functions and strong practicality; the calculated values ​​of pressure / flow / temperature / current physical quantities are accurate and reliable; compared with the sensors that use multiple single parameters at the same time, it saves cost; the pressure / flow / temperature / current multiple parameters are used to monitor the fluid pump at the same time, which can support the control of the start and stop of the fluid pump, the adjustment of the speed and direction, and the alarm and abnormal processing, meeting the precise control needs of the fluid pump in various scenarios.

[0045] It is understandable that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those skilled in the art, without departing from the spirit and substance of the present disclosure, the types and quantities of MEMS sensors, fluid pumps, and DC motors can be increased, various modifications and improvements can be made, and the application scope of the intelligent multi-parameter monitoring controller can be broadened, and these modifications, improvements, and broadenings are also considered to be within the protection scope of the present disclosure.

Claims

1. An intelligent multi-parameter monitoring controller for a fluid pump, characterized in that: It includes: Fluid parameter physical quantity input mechanism, control module U1 and fluid pump operation regulator; The control module U1 is implemented based on an MCU whose internal ADC supports multiple pairs of external differential input channels; The fluid parameter physical quantity input mechanism includes: a MEMS sensor for monitoring the fluid parameter for reference when the fluid pump is running; the number of the MEMS sensors is greater than or equal to 1; each MEMS sensor is arranged at a corresponding detection position on the monitored fluid pump, and all the MEMS sensors are electrically connected to the control module U1, and the MEMS sensors convert the detected parameter physical quantity into an electrical signal and directly input it into the control module U1; The control module U1 receives all the fluid parameter electrical signals collected by the MEMS sensor, converts them into corresponding ADC values ​​based on the internal ADC module, generates a control signal, and sends it to the fluid pump operation regulator; The fluid pump operation regulator is electrically connected to the monitored fluid pump and controls the operation of the monitored fluid pump based on the control signal.

2. According to claim 1, an intelligent multi-parameter monitoring controller for a fluid pump, characterized in that: The MEMS sensors in the fluid parameter physical quantity input mechanism include: a pressure sensor S1, a flow sensor S2, a temperature sensor S3 and a current sensor S4.

3. According to claim 1, an intelligent multi-parameter monitoring controller for a fluid pump, characterized in that: The fluid pump operation regulator includes: an NMOS tube Q2, an optocoupler OP1, an insulated gate bipolar transistor Q1, a double-pole double-throw relay K1, an external power supply interface RS3 and a fluid pump speed adjustment interface RS4; the fluid pump speed adjustment interface RS4 is connected to the power supply input interface of the fluid pump; the external power supply interface RS3 is connected to an external DC power supply.

4. According to claim 3, an intelligent multi-parameter monitoring controller for a fluid pump is characterized in that: The fluid pump operation regulator also includes: resistors R3-R6, a bidirectional transient voltage suppressor D1 and a regulator power supply interface RS1; Pin 1 of the fluid pump speed regulating interface RS4 is connected to one end of the bidirectional TVS diode D1 and then to pin 3 of the double-pole double-throw relay K1; pin 2 of the fluid pump speed regulating interface RS4 is connected to the other end of the bidirectional TVS diode D1 and pin 6 of the double-pole double-throw relay K1; pin 1 of the external power interface RS3 is connected to pins 2 and 5 of the double-pole double-throw relay K1 and one end of the resistor R4; pin 2 of the external power interface RS3 is connected to the emitter E of the insulated gate bipolar transistor Q1 and pin 3 of the optocoupler OP1; Pin 1 of the double-pole double-throw relay K1 is connected to pin 4 of the control module U1, and pin 4 of the double-pole double-throw relay K1 is connected to pin 7 of the double-pole double-throw relay K1 and then connected to the collector C of the insulated gate bipolar transistor Q1; pin 8 of the double-pole double-throw relay K1 is connected to pin 1 of the control module U1; The other end of the resistor R4 is connected to the gate G of the insulated gate bipolar transistor Q1 and then to the 4th pin of the optocoupler OP1; the 1st pin of the optocoupler OP1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R5 and then to the 2nd pin of the control module U1; the 2nd pin of the optocoupler OP1 is connected to the other end of the resistor R5 and the drain D of the NMOS tube Q2; the source S of the NMOS tube Q2 is connected to one end of the resistor R6 and then to the ground, the gate G of the NMOS tube Q2 is connected to the other end of the resistor R6 and then to the 5th pin of the control module U1; Pin 1 of the regulator power interface RS1 is connected to pin 4 of the control module U1 , and pin 2 of the regulator power interface RS1 is connected to pin 3 of the control module U1 .

5. According to claim 3, an intelligent multi-parameter monitoring controller for a fluid pump is characterized in that: The fluid pump operation regulator also includes: a bus interface RS2, which provides an interface for external data communication; pin 1 of the bus interface RS2 is connected to pin 7 of the control module U1, and pin 2 of the bus interface RS2 is connected to pin 8 of the control module U1.

6. The intelligent multi-parameter monitoring controller for a fluid pump according to claim 2, characterized in that: The fluid parameter physical quantity input mechanism also includes: decoupling capacitors C1-C4; Pin 1 of the pressure sensor S1 is connected to pin 18 of the control module U1, and pin 2 of the pressure sensor S1 is connected to one end of the capacitor C1 and pin 2 of the control module U1; pin 3 of the pressure sensor S1 is connected to pin 20 of the control module U1, pin 4 of the pressure sensor S1 is grounded, and the other end of the capacitor C1 is grounded; Pin 1 of the flow sensor S2 is connected to pin 15 of the control module U1, pin 2 of the flow sensor S2 is connected to pin 2 of the control module U1 and one end of the capacitor C2, the other end of the capacitor C2 is grounded, pin 3 of the flow sensor S2 is connected to pin 16 of the control module U1, and pin 4 of the flow sensor S2 is grounded; Pin 1 of the temperature sensor S3 is connected to pin 13 of the control module U1, pin 2 of the temperature sensor S3 is connected to pin 2 of the control module U1 and one end of the capacitor C3, the other end of the capacitor C3 is grounded, pin 3 of the temperature sensor S3 is connected to pin 14 of the control module U1, and pin 4 of the temperature sensor S3 is grounded; Pin 1 of the current sensor S4 is connected to pin 11 of the control module U1, pin 2 of the current sensor S4 is connected to pin 2 of the control module U1 and one end of the capacitor C4, the other end of the capacitor C4 is grounded, pin 3 of the current sensor S4 is connected to pin 12 of the control module U1; pin 4 of the current sensor S4 is grounded.

7. The intelligent multi-parameter monitoring controller for a fluid pump according to claim 1, characterized in that: It also includes: a decoupling capacitor C0, a power indicator light DS1, a warning light DS2, a resistor R1 and a resistor R2; The negative electrode of the power indicator light DS1 is grounded, the positive electrode of the power indicator light DS1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to pin 4 of the control module U1; The cathode of the warning light DS2 is connected to the pin 10 of the control module U1, the anode of the warning light DS2 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the pin 4 of the control module U1; Pin 3 of the control module U1 is grounded, pin 4 of the control module U1 is connected to VDD and one end of the decoupling capacitor C0, and the other end of the decoupling capacitor C0 is grounded.

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