CN115230476A - Fuel cell automobile detection circuit and method - Google Patents
Fuel cell automobile detection circuit and method Download PDFInfo
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- CN115230476A CN115230476A CN202210938610.0A CN202210938610A CN115230476A CN 115230476 A CN115230476 A CN 115230476A CN 202210938610 A CN202210938610 A CN 202210938610A CN 115230476 A CN115230476 A CN 115230476A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0053—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to fuel cells
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04664—Failure or abnormal function
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04992—Processes for controlling fuel cells or fuel cell systems characterised by the implementation of mathematical or computational algorithms, e.g. feedback control loops, fuzzy logic, neural networks or artificial intelligence
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
- H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane
Abstract
The invention discloses a fuel cell automobile detection circuit and a method, which effectively solve the problem that a sensor cannot detect leakage of a fuel cell, so that the safety of the fuel cell and an automobile is influenced. The detection circuit comprises a primary detection circuit and a secondary confirmation circuit, wherein the primary detection circuit obtains a current signal of the fuel cell and a power signal acquired by a power sensor U2 by using a leakage signal of the fuel cell acquired by a leakage sensor U1, obtains a current change signal by using the current signal, transmits the current change signal and the power signal to the secondary confirmation circuit, calculates the power signal to obtain a power change signal and a high level signal, calculates the current change signal, the power change signal and the high level signal, outputs an emergency signal and a reminding signal to an ECU, and further ensures the safety of the fuel cell and a fuel cell automobile by using a detection method.
Description
Technical Field
The invention relates to the field of hydraulic system detection, in particular to a fuel cell automobile detection circuit and a method.
Background
The fuel cell vehicle is one of electric vehicles, and due to the characteristic of fuel saving, the electric vehicles are generally concerned by people, and show a trend of accelerating development, the existing fuel cell vehicles can be divided into various vehicles with solid fuel, gas fuel, liquid fuel and the like, while the fuel cell is one of the main energy sources of the vehicle, and the safety of the fuel cell is closely related to the safety of the vehicle.
Therefore, the prior art provides a leak detection system and a detection method for a power battery box of an electric vehicle through a patent document with a patent application number of 201610880537.0, which detects a leak of a fuel battery, and meanwhile, other prior arts also provide various sensors for the fuel battery for safety detection, for example, other temperature sensors such as a thermistor are used for detecting the temperature of the fuel battery, a voltage sensor is used for detecting the voltage of the fuel battery, a current sensor is used for detecting the voltage of the fuel battery, and the like, the sensors can accurately detect the temperature, the voltage and the current of the fuel battery, thereby greatly ensuring the safety of the fuel battery vehicle, but the prior arts have the following problems:
(1) The detection mode also needs to continuously monitor the fuel cell, so that the sensor also needs to be powered all the time, and more power resources are consumed;
(2) The detection of leakage and the detection of voltage, current and the like in the detection mode are carried out separately, no intersection exists between the detections, and the prior art ignores the relation between the leakage and the voltage and the current;
namely, the leakage detection method provided by the prior art has the problems of low accuracy and easy occurrence of false alarm, thereby affecting the normal work of the ECU and the safety of the automobile.
The present invention therefore provides a new solution to this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a fuel cell automobile detection circuit and a method, which effectively solve the problem that the safety of an automobile is affected due to the defect of detection of leakage of a fuel cell in the prior art.
The technical scheme for solving the problem is that the fuel cell automobile detection circuit comprises a primary detection circuit and a secondary confirmation circuit, wherein the secondary confirmation circuit comprises a processor and an output device;
the primary detection circuit detects a current signal and a power signal of the fuel cell after detecting the leakage signal, obtains a current change signal by using the current signal, and transmits the current change signal and the power signal to the reconfirmation circuit;
a processor in the reconfirmation circuit obtains a power change signal by using the power signal, obtains a high-level signal by using the power change signal, and transmits the high-level signal and the power change signal to the processor;
and an output device in the reconfirmation circuit respectively obtains a reminding signal and an emergency signal from the high-level signal, the power change signal and the current change signal.
Further, the preliminary detection circuit amplifies a liquid leakage signal of the fuel cell acquired by the liquid leakage sensor U1, then starts detection of a current signal of the fuel cell and a power signal of the fuel cell acquired by the power sensor U2, subtracts the current signal to obtain a current change signal, and outputs the current change signal and the power signal to the reconfirmation circuit.
Further, the processor performs subtraction on the power signal output by the preliminary detection circuit to obtain a power change signal, and determines the power change signal to obtain a high-level signal.
Furthermore, the output device outputs an emergency signal after performing operation on the power change signal and the current change signal, outputs a reminding signal after performing AND operation on the high-level signal and the current change signal, and finally outputs the emergency signal and the reminding signal to the ECU.
A fuel cell automobile detection method comprises the following specific steps:
s1, a primary detection circuit detects a fuel cell of an automobile by using a leakage sensor, when leakage is detected, current and power detection of the fuel cell is started, and an ECU rechecks the leakage of the fuel cell;
s2, judging the current of the fuel cell, and confirming the processor in the circuit again to judge the discharge mode of the fuel cell by using the power of the fuel cell when the current of the fuel cell is judged to be changed greatly;
s3, when the fuel cell is judged to be in the constant-power discharging mode, confirming that an output device in the circuit outputs a reminding signal to the ECU again, and reminding an owner of the fuel automobile that the fuel cell is in a dangerous state at the moment by using the ECU;
and S4, when the fuel cell is judged to be in the constant current discharging mode, the output device in the circuit is confirmed again to output an emergency signal to the ECU, the ECU is utilized to remind a vehicle owner of the fuel vehicle that the fuel cell is in an emergency state at the moment, and the vehicle is stopped.
Further, the preliminary detection circuit in step S1 determines that liquid leakage occurs when the liquid leakage sensor outputs a liquid leakage signal.
The invention realizes the following beneficial effects:
the method comprises the steps of setting a primary detection circuit and a secondary confirmation circuit for a fuel cell of a fuel cell automobile, detecting whether the fuel cell leaks or not by using a leakage sensor U1 in the primary detection circuit, detecting the power and the current of the fuel cell when a leakage signal is detected, and judging the discharge mode of the fuel cell by using the secondary confirmation circuit, so that a power change signal and a current change signal are respectively used for outputting a reminding signal and an emergency signal to an ECU by using an AND gate U4A and an AND gate U3A, thereby accurately judging whether the state of the fuel cell after leakage is serious or not.
Drawings
Fig. 1 is a schematic diagram of signal conversion of a detection circuit provided in the present invention.
Fig. 2 is a schematic diagram of a preliminary detection circuit of the present invention.
Fig. 3 is a schematic diagram of a reconfirmation circuit of the invention.
Fig. 4 is a flowchart of a detection method provided by the present invention.
Detailed Description
The foregoing and other technical and other features and advantages of the invention will be apparent from the following more particular description of the embodiments, as illustrated in the accompanying drawings in which reference is made to figures 1-4. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A fuel cell automobile detection circuit is applied to a fuel cell of an automobile, the primary detection circuit obtains a current signal of the fuel cell and a power signal collected by a power sensor U2 by using a leakage signal of the fuel cell collected by a leakage sensor U1, obtains a current change signal by using the current signal, transmits the current change signal and the power signal to a secondary confirmation circuit, and the secondary confirmation circuit calculates the power signal to obtain a power change signal and a high level signal and outputs an emergency signal and a reminding signal to an ECU (electronic control Unit).
The preliminary detection circuit detects a leakage signal of the fuel cell by using a leakage sensor U1, where the fuel cell is exemplified by a hydrogen fuel cell, the leakage sensor U1 may correspondingly detect a leakage signal by using a hydrogen sensor MQ-8 with a similar model, that is, the leakage sensor U1 uses a sensor corresponding to a component of the fuel cell, which is the prior art, and is not described herein again, and the leakage sensor U1 is installed at a place where leakage of the fuel cell easily occurs, when the leakage sensor U1 outputs the leakage signal, it indicates that the fuel cell leaks, and amplifies the leakage signal by using a triode Q1 and a triode Q2, so as to avoid that the leakage is small and cannot pass through a circuit loss, and the amplified leakage signal conducts a thyristor Q3 and a thyristor Q4 through a diode D1 and a capacitor C3, the thyristor Q3 transmits a current signal acquired by a current sensor arranged for the fuel cell in the prior art to the capacitor C5, the capacitor C4 and the resistor R5, and the capacitor C5, the capacitor C4 and the resistor R5 filter an alternating component in the current signal, so as to ensure accuracy of the current signal, wherein the current sensor arranged for the fuel cell is in the prior art, and is not described herein any more, and transmits the current signal to the operational amplifier U2B in two paths through the diode D2, the operational amplifier U2B performs subtraction on the received current signal directly transmitted from one path and the current signal delayed by the resistor R4 and the capacitor C6, so that the operational amplifier U2B outputs a current change signal, when the current change signal turns on the triode Q5, it is indicated that the current signal of the fuel cell at this time does not change greatly and is in a normal state, the triode Q5 ensures circuit safety through the resistor R8 and the capacitor C2, when the current change signal turns on the diode D4, it indicates that the current of the fuel cell has changed greatly, the diode D4 outputs the current change signal to the reconfirmation circuit, and after the thyristor Q4 is turned on, the power signal of the fuel cell, which is detected by the power sensor U2, is output to the reconfirmation circuit, where the power sensor U2 may adopt a power sensor of a model similar to WB9128-1 for detection;
the reconfirmation circuit comprises a processor and an output device, the processor receives a power signal output by the primary detection circuit by using the processor, the processor transmits the power signal to an operational amplifier U1B in two paths through a diode D3, the operational amplifier U1B performs subtraction operation on one path of the received power signal directly transmitted and the other path of the received power signal subjected to time delay through a resistor R13 and a capacitor C8, so that the operational amplifier U1B outputs a power change signal, if the power change signal conducts a triode Q6, the fuel cell is in a constant-power discharge mode at the moment, the conduction of a diode D4 by the amplitude of the current change signal at the moment is normal, the triode Q6 in the output device conducts and operation on an AND gate U4A in the output device through a high-level signal output by the diode D6 and the current change signal output by the primary detection circuit, so as to output a reminding signal, the diode D7 transmits the reminding signal to a vehicle owner through a pin 1 and a pin 3 of a switch S1, and the ECU reminds the fuel cell of the ECU, and the ECU needs to process; if the power change signal conducts the diode D5, the fuel cell is in a constant current discharge mode at the moment, the current change signal conducts the diode D4 abnormally, the diode D5 in the output device outputs an emergency signal by using the AND gate U3A to output the power change signal and the current change signal at the moment, the emergency signal conducts the relay K1 through the diode D8, the relay K1 enables the pin 3 of the switch S1 to be turned to be connected with the pin 2, the emergency signal at the moment is output to the ECU, and the ECU reminds the vehicle owner of serious liquid leakage and stopping the fuel cell vehicle; meanwhile, a thermistor PTCR detects a temperature signal of the fuel cell, the temperature signal is transmitted to an operational amplifier U3B in two paths through a diode D10, the operational amplifier U3B performs subtraction operation on the directly transmitted temperature signal and the temperature signal delayed by a resistor R18 and a capacitor C7, the operational amplifier U3B outputs a temperature change signal, when a voltage-regulator tube D9 is conducted through the temperature change signal, the temperature rise amplitude of the fuel cell is larger, and at the moment, the voltage-regulator tube D9 outputs an emergency signal to an ECU through a diode D8 and pins 2 and 3 of a switch S1, so that emergency reminding of a vehicle owner is realized.
Therefore, the invention provides a detection circuit and simultaneously provides a fuel cell automobile detection method, and the detection method comprises the following specific steps:
s1, detecting a fuel cell of an automobile by using a leakage sensor, starting current and power detection of the fuel cell when leakage is detected, and rechecking the leakage of the fuel cell by an ECU (electronic control unit);
s2, judging the current of the fuel cell, and judging the discharge mode of the fuel cell by using the power of the fuel cell when the current of the fuel cell is judged to be changed greatly;
s3, when the fuel cell is judged to be in a constant power discharge mode, confirming again that an output device in the circuit outputs a reminding signal to the ECU, and reminding an owner of the fuel automobile that the fuel cell is in a dangerous state at the moment by using the ECU;
and S4, when the fuel cell is judged to be in the constant current discharging mode, the output device in the circuit is confirmed again to output an emergency signal to the ECU, the ECU is utilized to remind a vehicle owner of the fuel vehicle that the fuel cell is in an emergency state at the moment, and the vehicle is stopped.
The step S1 determines that liquid leakage occurs when the liquid leakage sensor outputs a liquid leakage signal.
When the primary detection circuit outputs the power signal to the secondary judgment circuit, the power signal and the current signal are transmitted to the ECU, the ECU rechecks the leakage of the fuel cell, namely the ECU utilizes the power signal and the current signal to calculate to obtain a voltage signal, namely the power signal is divided by the current signal to obtain a voltage signal, when the amplitude of the voltage signal is reduced and does not conform to the discharge characteristic curve of the fuel cell (the discharge characteristic curve is obtained by the prior art), if the discharge voltage of the fuel cell is not basically stable in the middle discharge period, the voltage is always reduced as in the initial discharge period, and the leakage signal is detected, namely the leakage phenomenon of the fuel cell at the moment is judged, and the ECU reminds a vehicle owner to immediately maintain the fuel cell; when the power change signal in the circuit is judged again to conduct the diode D5, namely the power at the moment is changed greatly, the ECU utilizes the power change signal to limit the power output of the fuel cell at the moment, if the output power of the fuel cell is reduced to half of the original output power, meanwhile, the ECU is utilized to remind a vehicle owner that the output power is limited due to liquid leakage of the fuel cell at the moment, the accuracy of the detection device and the detection method is further ensured by utilizing the mode, the phenomenon of misjudgment is avoided, the safety of the vehicle and passengers is ensured by limiting the power of the fuel cell, and traffic accidents are avoided.
In step S2, it is determined that the current changes greatly when the current change signal turns on the diode D4.
When the fuel cell leakage detection circuit is used, a primary detection circuit and a secondary confirmation circuit are included in the detection circuit, the primary detection circuit detects a leakage signal of the fuel cell by using a leakage sensor U1, the leakage signal conducts a thyristor Q3 and a thyristor Q4 through a diode D1 and a capacitor C3, the thyristor Q3 transmits a current signal to an operational amplifier U2B in two paths through a diode D2, so that the operational amplifier U2B outputs a current change signal, when the current change signal conducts a triode Q5, the triode Q5 ensures circuit safety through a resistor R8 and a capacitor C2, when the current change signal conducts a diode D4, the diode D4 outputs the current change signal to the secondary confirmation circuit, and after the thyristor Q4 is conducted, a power signal of the fuel cell detected by a power sensor U2 is output to the secondary confirmation circuit; the reconfirmation circuit receives the power signal output by the primary detection circuit by the processor, the processor transmits the power signal to the operational amplifier U1B in two paths through the diode D3, the operational amplifier U1B performs subtraction operation to output a power change signal, if the power change signal switches on the triode Q6, the triode Q6 performs AND operation on an AND gate U4A in the output device through a high level signal output by the diode D6 and a current change signal output by the primary detection circuit to output a reminding signal, the diode D7 transmits the reminding signal to the ECU through a pin 1 and a pin 3 of the switch S1 to remind a vehicle owner of liquid leakage phenomenon and need to process the liquid leakage phenomenon, and if the power change signal switches on the diode D5, the power change signal and the current change signal are output by a diode D5 through an AND gate U3A to output an emergency signal, the emergency signal conducts a relay K1 through a diode D8, the relay K1 enables a pin 3 of a switch S1 to be turned to be connected with a pin 2, the emergency signal at the moment is output to an ECU, the fact that the leakage of the fuel cell is serious is reminded to a vehicle owner, the use of the fuel cell vehicle needs to be stopped, meanwhile, a thermistor PTCR is used for detecting the temperature signal of the fuel cell, the temperature signal is subjected to subtraction operation through an operational amplifier U3B to output the temperature change signal, when the temperature change signal conducts a voltage stabilizing tube D9, the temperature rise amplitude of the fuel cell is larger at the moment, and at the moment, the voltage stabilizing tube D9 outputs the emergency signal to the ECU through the diode D8, the pin 2 and the pin 3 of the switch S1, and the emergency signal is reminded to the vehicle owner; and the detection method is matched with the detection device, so that whether the fuel cell leaks or not is judged, and the discharge mode of the fuel cell is adopted, so that whether the fuel cell is in a dangerous state or an emergency state is judged, and a vehicle owner is reminded.
The invention achieves the following effects:
(1) The method comprises the steps that a primary detection circuit and a secondary confirmation circuit are arranged on a fuel cell of a fuel cell automobile, whether the fuel cell leaks or not is detected by using a leakage sensor U1 in the primary detection circuit, when a leakage signal is detected, the power and the current of the fuel cell are detected, and the discharge mode of the fuel cell is judged by using the secondary confirmation circuit, so that a power change signal and a current change signal are respectively used for outputting a reminding signal and an emergency signal to an ECU by using an AND gate U4A and an AND gate U3A, and therefore whether the state of the fuel cell after leakage is serious or not is accurately judged;
(2) The leakage sensor U1, the power sensor U2 and the current sensor which is arranged aiming at the fuel cell in the prior art are used in the primary detection circuit, so that the signals collected by the three are processed in a linkage way, and the current signal is processed by the operational amplifier U2B, so that whether the current of the fuel cell is greatly changed or not is accurately judged, the safety of the fuel cell is preliminarily judged, and the problem that the sensor which is arranged in the prior art cannot detect leakage so as to influence the use of a vehicle owner on a fuel cell vehicle is avoided;
(3) The power signal is processed by arranging the operational amplifier U1B, the triode Q6 and the diode D5 in the reconfirmation circuit, so that the discharging mode of the fuel cell is judged, the accuracy of the primary detection circuit is further improved, and when the temperature of the fuel cell is detected to be greatly changed, an emergency signal is output to the ECU by using the diode D8, so that the emergency prompt for a vehicle owner of the fuel cell vehicle is realized, the fire disaster phenomenon of the fuel cell vehicle caused by the fuel cell is avoided, and the safety of the fuel cell vehicle and personnel in the vehicle is further ensured;
(4) The accuracy of the detection method and the detection circuit is improved by setting rechecking on the detection method and the detection circuit, the phenomenon of misjudgment is avoided, the safety of the automobile and passengers is further ensured by limiting the power of the fuel cell, and the occurrence of traffic accidents is avoided.
Claims (6)
1. A fuel cell automobile detection circuit is characterized in that the detection circuit comprises a preliminary detection circuit and a reconfirmation circuit, wherein the reconfirmation circuit comprises a processor and an output device;
the primary detection circuit detects a current signal and a power signal of the fuel cell after detecting the leakage signal, obtains a current change signal by using the current signal, and transmits the current change signal and the power signal to the reconfirmation circuit;
the processor in the reconfirmation circuit obtains a power change signal by using the power signal, obtains a high-level signal by using the power change signal, and transmits the high-level signal and the power change signal to the processor;
and an output device in the reconfirmation circuit respectively obtains a reminding signal and an emergency signal from the high-level signal, the power change signal and the current change signal.
2. The fuel cell automobile detection circuit according to claim 1, wherein the preliminary monitoring circuit amplifies a leakage signal of the fuel cell collected by the leakage sensor U1, then starts detection of a current signal of the fuel cell and a power signal of the fuel cell collected by the power sensor U2, and subtracts the current signal to obtain a current change signal, and outputs the current change signal and the power signal to the reconfirmation circuit.
3. The fuel cell vehicle detection circuit of claim 1, wherein the processor subtracts the power signal output by the preliminary detection circuit to obtain a power variation signal, and determines the power variation signal to obtain a high level signal.
4. The fuel cell vehicle detection circuit according to claim 1, wherein the output unit outputs an emergency signal after performing an operation using the power variation signal and the current variation signal, outputs a warning signal after performing an and operation using the high level signal and the current variation signal, and finally outputs the emergency signal and the warning signal to the ECU.
5. A fuel cell automobile detection method is characterized by comprising the following specific steps:
s1, a primary detection circuit detects a fuel cell of an automobile by using a leakage sensor, when leakage is detected, current and power detection of the fuel cell is started, and an ECU rechecks the leakage of the fuel cell;
s2, judging the current of the fuel cell, and confirming the discharging mode of the fuel cell by using the power of the fuel cell by a processor in the circuit again when the current of the fuel cell is judged to be greatly changed;
s3, when the fuel cell is judged to be in the constant-power discharging mode, confirming that an output device in the circuit outputs a reminding signal to the ECU again, and reminding an owner of the fuel automobile that the fuel cell is in a dangerous state at the moment by using the ECU;
and S4, when the fuel cell is judged to be in the constant current discharge mode, reconfirming that an output device in the circuit outputs an emergency signal to the ECU, reminding an owner of the fuel vehicle of the emergency state of the fuel cell by using the ECU, and stopping using the vehicle.
6. The fuel cell vehicle detection method according to claim 5, wherein the preliminary detection circuit in step S1 determines that liquid leakage occurs when the liquid leakage sensor outputs a liquid leakage signal.
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| CN114442540A (en) * | 2022-02-25 | 2022-05-06 | 黄河水利职业技术学院 | Base station detection and control circuit |
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