Subway air conditioner control system
By controlling the switching of temperature detection sensors through the passenger detection module and the main control module, and adjusting the cooling volume with the frequency converter, the problem of inaccurate temperature control in traditional subway air conditioning control systems is solved, and a comfortable environment control with strong adaptability to passenger density is achieved.
Patent Information
- Application Number
- CN202520395679.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-03-07
AI Technical Summary
Traditional subway air conditioning control systems cannot dynamically adjust temperature control according to passenger density, resulting in energy waste or inaccurate temperature detection, which affects passenger comfort.
The system uses a passenger detection module to detect passenger density, and controls the switching module to switch between main and auxiliary temperature detection sensors through a comparison module and a main control module. Combined with the frequency converter and compressor, the system adjusts the amount of cooling air to achieve precise temperature control.
It improves temperature detection accuracy and energy efficiency, ensuring passenger comfort under different passenger densities and enhancing the riding experience.
Smart Images
Figure CN223736029U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of air conditioning control, in particular to a subway air conditioning control system. BACKGROUND
[0002] In subway operation, the performance of the air conditioning system plays a key role in passenger comfort. The traditional subway air conditioning control system often adopts a fixed temperature control strategy, without fully considering the dynamic changes in passenger density inside the train. On the one hand, regardless of the number of passengers, the temperature detection method is single and lacks flexibility. When there are fewer passengers, the same detection mode is still used, causing unnecessary waste of energy; while in the case of passenger density, the detection range is limited and the temperature information inside the car cannot be accurately obtained, resulting in inaccurate temperature control. On the other hand, since the cooling intensity cannot be adjusted in real time according to the passenger density, in the case of many passengers, the air conditioning cooling capacity may be insufficient, causing the car to be hot; when there are fewer passengers, it may be over-cooled, making the passengers feel uncomfortable.
[0003] Therefore, the existing subway air conditioning control system has the problem that the temperature control cannot meet the passenger comfort requirement, CONTENT OF THE INVENTION
[0004] The subway air conditioning control system provided by the embodiments of the present disclosure solves the problem that the temperature control of the subway air conditioning control system cannot meet the passenger comfort requirement.
[0005] The subway air conditioning control system provided by the embodiments of the present disclosure solves the problem that the temperature control of the subway air conditioning control system cannot meet the passenger comfort requirement.
[0006] The passenger detection module is configured to detect the passenger density on the subway train, and the output end of the passenger detection module is connected to the first end of the comparison module, and the second end of the comparison module is connected to the main control module.
[0007] The control end of the switch module is connected to the main control module, the first end of the switch module is connected to the power supply module, the second end of the switch module is connected to the power supply end of the temperature detection module, and the output end of the temperature detection module is connected to the main control module.
[0008] The first end of the drive module is connected to the main control module, the second end of the drive module is connected to the first end of the frequency converter, and the second end of the frequency converter is connected to the compressor.
[0009] In an exemplary embodiment of the present disclosure, the switch module includes a first switch unit and a second switch unit; and the temperature detection module includes a first temperature detection unit and a second temperature detection unit.
[0010] The control end of the first switch unit and the second switch unit is connected with the main control module, the first end of the first switch unit and the second switch unit is connected with the power module, the second end of the first switch unit is connected with the power supply end of the first temperature detection unit, and the second end of the second switch unit is connected with the power supply end of the second temperature detection unit.
[0011] The output end of the first temperature detection unit and the second temperature detection unit is connected with the main control module.
[0012] In an exemplary embodiment of the present disclosure, the passenger detection module comprises a passenger density detection circuit and an adjusting circuit.
[0013] The passenger density detection circuit is configured to detect the passenger density in the subway train, the input end of the adjusting circuit is connected with the passenger density detection circuit, and the output end of the adjusting circuit is connected with the first end of the comparison module.
[0014] In an exemplary embodiment of the present disclosure, the passenger density detection circuit comprises an operational amplifier U4, a triode Q1, a resistor R1, a first pressure sensor J1 and a second pressure sensor J2.
[0015] The non-inverting input end of the operational amplifier U4 is connected with a Vref1 reference voltage, the inverting input end of the operational amplifier U4 is grounded through the resistor R1, the output end of the operational amplifier U4 is connected with the base of the triode Q1, the collector of the triode Q1 is connected with a VEE power supply, the emitter of the triode Q1 is connected with the first input end of the first pressure sensor J1 and the second pressure sensor J2 respectively, the second input end of the first pressure sensor J1 and the second pressure sensor J2 is connected with the inverting input end of the operational amplifier U4, and the output end of the first pressure sensor J1 and the second pressure sensor J2 is connected with the input end of the adjusting circuit.
[0016] In an exemplary embodiment of the present disclosure, the adjusting circuit comprises an operational amplifier U3, a resistor R7, an operational amplifier U2, a resistor R8, a resistor R9, a rheostat RP1 and an operational amplifier U1.
[0017] The non-inverting input end of the operational amplifier U3 is connected with the first output end of the first pressure sensor J1, the inverting input end of the operational amplifier U3 is connected with the second output end of the first pressure sensor J1, the output end of the operational amplifier U3 is connected with the inverting input end of the operational amplifier U3 through the resistor R7, and the output end of the operational amplifier U3 is connected with the inverting input end of the operational amplifier U1.
[0018] The non-inverting input terminal of the operational amplifier U2 is connected to the first output terminal of the second pressure sensor J2, the inverting input terminal of the operational amplifier U2 is connected to the second output terminal of the second pressure sensor J2, the output terminal of the operational amplifier U2 is connected to the non-inverting input terminal of the operational amplifier U2 through the resistor R8, and the output terminal of the operational amplifier U2 is connected to the non-inverting input terminal of the operational amplifier U1.
[0019] The non-inverting input terminal of the operational amplifier U1 is connected to the VRef reference voltage through the rheostat RP1, the output terminal of the operational amplifier U1 is connected to the inverting input terminal of the operational amplifier U1 through the resistor R9, and the output terminal of the operational amplifier U1 is connected to the first terminal of the comparison module.
[0020] In an exemplary embodiment of the present disclosure, the comparison module comprises: an operational amplifier U5.
[0021] The non-inverting input terminal of the operational amplifier U5 is connected to the output of the passenger detection module, the inverting input terminal of the operational amplifier U5 is connected to a reference power supply, and the output terminal of the operational amplifier U5 is connected to the master control module.
[0022] In an exemplary embodiment of the present disclosure, the comparison module further comprises: a rheostat RP2, a resistor R11 and a zener D1.
[0023] The first terminal of the rheostat RP2 is connected to a VCC power supply, the second terminal of the rheostat RP2 is grounded through the resistor R11, the cathode of the zener D1 is connected to the second terminal of the rheostat RP2, the anode of the zener D1 is grounded, and the cathode of the zener D1 is connected to the inverting input terminal of the operational amplifier U5.
[0024] The subway air conditioning control system provided by the embodiment of the present disclosure has the following beneficial effects: the passenger detection module detects the passenger density, so that the system can be flexibly adjusted according to the actual number of passengers. When the passenger density is small, only the main temperature detection sensor is enabled, unnecessary energy consumption can be avoided, and the energy saving purpose is achieved; when the passenger density is large, the main and auxiliary temperature detection sensors are turned on at the same time, the temperature detection range is expanded, and the temperature detection precision is greatly improved. The temperature signal is converted into a voltage signal by the temperature detection module, the master control module accurately judges the temperature in the vehicle based on the voltage signal, and then outputs appropriate control instructions to the driving module. The driving module controls the frequency converter, so that the compressor generates a corresponding amount of cold air, and the precise control of the temperature in the train is realized. This series of operations not only improves the precision of temperature control, but also ensures that a comfortable riding environment is created for passengers under different passenger densities, and the riding experience of passengers is improved. BRIEF DESCRIPTION OF DRAWINGS
[0025] In order to make the technical solutions in the embodiments of the present disclosure clearer, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor under the premise of the drawings.
[0026] Figure 1 is a structural schematic diagram of a subway air conditioning control system provided by an embodiment of the present disclosure;
[0027] Figure 2 is a structural schematic diagram of a subway air conditioning control system provided by another embodiment of the present disclosure;
[0028] Figure 3 is a circuit diagram of a passenger detection module provided by an embodiment of the present disclosure;
[0029] Figure 4 is a circuit diagram of a comparison module provided by an embodiment of the present disclosure. DETAILED DESCRIPTION
[0030] In order to make the technical solutions in the embodiments of the present disclosure clearer, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor under the premise of the drawings.
[0031] The terms "include", and other any variants such as "comprising", "having", "including", "containing", "encompassing" and other similar terms in the specification and claims of the present disclosure and above drawings are intended to cover a non-exclusive inclusion, and are not limited to the examples listed in the text. In addition, the terms "first" and "second" and the like are used to distinguish different objects, and are not used to describe a specific order.
[0032] The implementation of the present disclosure will be described in detail in the following with reference to the specific drawings:
[0033] Figure 1 is a structural schematic diagram of a subway air conditioning control system provided by an embodiment of the present disclosure. Referring to Figure 1The subway air conditioner control system comprises a passenger detection module, a comparison module, a main control module, a driving module, a frequency converter, a compressor, a switch module and a temperature detection module; the passenger detection module is configured to detect the passenger density on the subway train, the output end of the passenger detection module is connected to the first end of the comparison module, and the second end of the comparison module is connected to the main control module; the control end of the switch module is connected to the main control module, the first end of the switch module is connected to the power module, the second end of the switch module is connected to the power supply end of the temperature detection module, and the output end of the temperature detection module is connected to the main control module; the first end of the driving module is connected to the main control module, the second end of the driving module is connected to the first end of the frequency converter, and the second end of the frequency converter is connected to the compressor.
[0034] In the embodiment, the passenger detection module is used to detect the passenger density on the subway train, and the detected passenger density information is transmitted to the first end of the comparison module as an output signal. The comparison module is used to compare the passenger density information from the passenger detection module with the preset passenger density value. Through comparison, it is judged whether the passenger density on the current train is less than or greater than the set value, and then the comparison result is transmitted to the main control module.
[0035] In the embodiment, the temperature detection module comprises a main temperature detection sensor and an auxiliary temperature detection sensor, and the switch module can control the access of the main temperature detection sensor and the auxiliary temperature detection sensor respectively. The main control module sends different control instructions to the switch module according to the passenger density comparison result from the comparison module. When the passenger density on the train is less than the set value, the main control module sends the first control instruction to the switch module, at this time the switch module only turns on the main temperature detection sensor to make it work, and the auxiliary temperature detection sensor is in the non-working state. This is because in the case of small passenger density, only using the main temperature detection sensor can meet the basic demand of temperature detection in the train, so as to save energy. When the passenger density on the train is greater than the set value, the main control module sends the second control instruction to the switch module, and the switch module turns on the main temperature detection sensor and the auxiliary temperature detection sensor at the same time. Increasing the number of temperature detection sensors can expand the range of temperature detection and improve the accuracy of temperature detection to meet the more accurate requirements of temperature detection when the passenger density is large.
[0036] In the embodiment, the temperature detection module converts the detected temperature signal into a corresponding voltage signal and transmits the voltage signal to the main control module. The main control module determines the actual temperature in the train according to the received voltage signal. The main control module outputs a control instruction to the driving module based on the voltage signal output by the temperature detection module, that is, based on the actual temperature in the train. After receiving the control instruction output by the main control module, the driving module controls the frequency converter according to the requirements of the instruction. The frequency converter adjusts its output parameters according to the control signal of the driving module. The output of the frequency converter is connected to the compressor, and the frequency converter controls the compressor to work by adjusting the output parameters, so that the compressor generates a corresponding amount of cold air to cool the environment in the train, thereby realizing accurate control of the temperature in the train and ensuring the comfort of passengers.
[0037] From the above, it can be seen that the embodiment can flexibly adjust the system according to the actual number of passengers by detecting the passenger density through the passenger detection module. When the passenger density is small, only the main temperature detection sensor is enabled, unnecessary energy consumption can be avoided, and the purpose of energy saving is achieved; when the passenger density is large, the main and auxiliary temperature detection sensors are connected at the same time, the temperature detection range is expanded, and the temperature detection accuracy is greatly improved. The temperature detection module converts the temperature signal into a voltage signal, the main control module accurately judges the temperature in the vehicle based on the voltage signal, and then outputs appropriate control instructions to the driving module. The driving module controls the frequency converter to make the compressor generate a corresponding amount of cold air, thereby realizing accurate control of the temperature in the train. This series of operations not only improves the accuracy of temperature control, but also ensures that a comfortable riding environment is created for passengers under different passenger densities, thereby improving the passenger's riding experience.
[0038] As shown in FIG. 1, Figure 2 In an embodiment of the present disclosure, the switch module includes a first switch unit and a second switch unit; the temperature detection module includes a first temperature detection unit and a second temperature detection unit;
[0039] The control end of the first switch unit and the control end of the second switch unit are connected with the main control module; the first end of the first switch unit and the first end of the second switch unit are connected with the power module; the second end of the first switch unit is connected with the power supply end of the first temperature detection unit; and the second end of the second switch unit is connected with the power supply end of the second temperature detection unit.
[0040] The output end of the first temperature detection unit and the output end of the second temperature detection unit are connected with the main control module.
[0041] In the embodiment, the switch module is composed of the first switch unit and the second switch unit, and the main control module can independently control the on-off state of the two switch units.
[0042] When the master module sends the turn-on instruction to the first switch unit, the first switch unit is closed, the power module supplies power to the first temperature detection unit, and the first temperature detection unit starts to work, detects the temperature in the train, and transmits the detected temperature signal to the master module after converting the temperature signal into a voltage signal. When the master module sends the turn-on instruction to the second switch unit, the second switch unit is closed, the power module supplies power to the second temperature detection unit, and the second temperature detection unit starts to work and transmits the detected temperature signal to the master module after converting the temperature signal into a voltage signal.
[0043] When the passenger density on the train is less than the set value, the master module only sends the turn-on instruction to the first switch unit, and only the first temperature detection unit works, and the second temperature detection unit does not work because the second switch unit is not turned on. In this way, the basic temperature detection requirement can be met, and power consumption can be saved.
[0044] When the passenger density on the train is greater than the set value, the master module sends the turn-on instruction to the first switch unit and the second switch unit at the same time, so that the first temperature detection unit and the second temperature detection unit start to work. The two temperature detection units jointly detect the temperature, expand the temperature detection range, and improve the temperature detection accuracy, so that the master module can more accurately understand the temperature condition in the train.
[0045] In an embodiment of the present disclosure, the passenger detection module comprises a passenger density detection circuit and an adjusting circuit; the passenger density detection circuit is configured to detect the passenger density in the subway train, the passenger density detection circuit is connected to the input end of the adjusting circuit, and the output end of the adjusting circuit is connected to the first end of the comparison module.
[0046] In this embodiment, the passenger density in the subway train can be detected by an infrared sensor or a camera. For example, the infrared sensor can detect the number of human bodies in a certain area by emitting and receiving infrared rays, and then calculate the passenger density.
[0047] The adjusting circuit amplifies the signal output by the passenger density detection circuit to ensure that the signal can be accurately recognized by the comparison module. The comparison module can compare the actual passenger density signal transmitted by the adjusting circuit with the set threshold value, and output a corresponding signal to the master module according to the comparison result. For example, if the actual passenger density is less than the set threshold value, the comparison module can send a level signal indicating "low density" to the master module; if the actual passenger density is greater than the set threshold value, a level signal indicating "high density" is sent. The master module makes corresponding control according to the signal transmitted by the comparison module to realize intelligent control of the subway air conditioning system and improve the comfort of passengers and energy utilization efficiency.
[0048] As Figure 3As shown, in an embodiment of the present disclosure, the passenger density detection circuit includes: an operational amplifier U4, a transistor Q1, a resistor R1, a first pressure sensor J1 and a second pressure sensor J2; the non-inverting input terminal of the operational amplifier U4 is connected with a Vref1 reference voltage, the inverting input terminal of the operational amplifier U4 is grounded through the resistor R1, the output terminal of the operational amplifier U4 is connected with the base of the transistor Q1, the collector of the transistor Q1 is connected with a VEE power supply, the emitter of the transistor Q1 is connected with the first input terminal of the first pressure sensor J1 and the second pressure sensor J2 respectively, the second input terminals of the first pressure sensor J1 and the second pressure sensor J2 are connected with the inverting input terminal of the operational amplifier U4, and the output terminals of the first pressure sensor J1 and the second pressure sensor J2 are connected with the input terminal of the adjusting circuit.
[0049] In the present embodiment, the passenger density can be detected by the pressure sensor. The pressure sensor can be provided with multiple pressure sensors under the train pedal. The pressure sensor can convert the pressure signal into an electrical signal output. The passenger density on the train can be determined based on the size of the pressure signal. In the present embodiment, two pressure sensors are taken as an example. The first pressure sensor J1 and the second pressure sensor J2 are connected in parallel.
[0050] The non-inverting input terminal of the operational amplifier U4 is connected with a Vref1 reference voltage. The reference voltage provides a stable reference potential for the operational amplifier, which is used for subsequent comparison and signal processing. The operational amplifier U4 can compare the voltages at the non-inverting input terminal and the inverting input terminal. When there is a difference between the two, the operational amplifier generates a corresponding output signal at the output terminal. The signal is transmitted to the base of the transistor Q1, which is used to control the conduction state of the transistor. When the operational amplifier outputs a high level, the transistor Q1 is turned on; when the operational amplifier outputs a low level, the transistor Q1 is turned off. When the transistor is turned on, the VEE power supply provides working voltage for the first pressure sensor J1 and the second pressure sensor J2 through the transistor, so that they can work normally.
[0051] The first pressure sensor J1 and the second pressure sensor J2 are arranged under the train pedal to detect the pressure generated by the passengers stepping on the pedal. The arrangement of multiple pressure sensors can more comprehensively detect the pressure conditions at different positions in the train, thereby more accurately reflecting the passenger density. The pressure sensor can convert the detected pressure signal into an electrical signal. When a passenger steps on the pedal, the pressure sensor is subjected to pressure, and the internal physical properties change, thereby generating a corresponding electrical signal output. The first pressure sensor J1 and the second pressure sensor J2 are connected in parallel. This connection mode makes the output signals of the two sensors independent of each other, while the output signals of the two sensors can be superimposed or integrated for processing, so as to improve the accuracy and reliability of detection. The output terminals of the first pressure sensor J1 and the second pressure sensor J2 are connected with the input terminal of the adjusting circuit, and the converted electrical signal is transmitted to the adjusting circuit for further processing.
[0052] After receiving the electrical signal from the pressure sensor, the regulating circuit amplifies the signal. Since the magnitude of the pressure signal is related to the force and number of passengers pressing the pedals, the passenger density on the train can be determined based on the magnitude of the pressure signal. A larger pressure signal indicates that more passengers are pressing the pedals, and the passenger density on the train is higher; conversely, a smaller pressure signal indicates that there are fewer passengers, and the passenger density is lower.
[0053] like Figure 3 As shown, in one embodiment of this disclosure, the adjustment circuit includes: operational amplifier U3, resistor R7, operational amplifier U2, resistor R8, resistor R9, rheostat RP1, and operational amplifier U1; the non-inverting input terminal of operational amplifier U3 is connected to the first output terminal of the first pressure sensor J1, the inverting input terminal of operational amplifier U3 is connected to the second output terminal of the first pressure sensor J1, the output terminal of operational amplifier U3 is connected to the inverting input terminal of operational amplifier U3 through resistor R7, and the output terminal of operational amplifier U3 is connected to the inverting input terminal of operational amplifier U1; the non-inverting input terminal of operational amplifier U2... The input terminal is connected to the first output terminal of the second pressure sensor J2. The inverting input terminal of the operational amplifier U2 is connected to the second output terminal of the second pressure sensor J2. The output terminal of the operational amplifier U2 is connected to the inverting input terminal of the operational amplifier U2 through resistor R8. The output terminal of the operational amplifier U2 is connected to the non-inverting input terminal of the operational amplifier U1. The non-inverting input terminal of the operational amplifier U1 is connected to the VRef reference voltage through rheostat RP1. The output terminal of the operational amplifier U1 is connected to the inverting input terminal of the operational amplifier U1 through resistor R9. The output terminal of the operational amplifier U1 is connected to the first terminal of the comparator module.
[0054] In this embodiment, operational amplifier U3 amplifies the differential signal output from the first pressure sensor J1, with the amplification factor determined by resistor R7. The amplified signal is then sent to the inverting input of operational amplifier U1. Similarly, operational amplifier U2 processes the differential signal from the second pressure sensor J2, with the amplification factor determined by resistor R8. The amplified signal is then sent to the non-inverting input of operational amplifier U1. The non-inverting input of operational amplifier U1 is also connected to the VRef reference voltage via a variable resistor RP1. Operational amplifier U1 compares and performs calculations on the two input signals. Its output signal is fed back through resistor R9 and finally output to the first terminal of the comparison module, providing a suitable signal for subsequent passenger density comparison.
[0055] like Figure 4 As shown, in one embodiment of this disclosure, the comparison module includes: operational amplifier U5; the non-inverting input of operational amplifier U5 is connected to the output of the passenger detection module, the inverting input of operational amplifier U5 is used to connect to the reference power supply, and the output of operational amplifier U5 is connected to the main control module.
[0056] In this embodiment, when the voltage at the non-inverting input terminal is greater than the reference voltage at the inverting input terminal, the operational amplifier U5 outputs a high-level signal; conversely, when the voltage at the non-inverting input terminal is less than the reference voltage at the inverting input terminal, the operational amplifier U5 outputs a low-level signal.
[0057] The output of operational amplifier U5 is connected to the main control module. The high or low level signal output is transmitted to the main control module, which uses this signal to determine the current passenger density inside the train.
[0058] For example, if a high-level signal is output, the main control module can assume that the passenger density inside the train is higher than the set standard and increase the air conditioning cooling capacity; if a low-level signal is output, it means that the passenger density is lower than the set standard and the air conditioning cooling capacity is appropriately reduced.
[0059] The comparison module compares the passenger detection signal and the reference signal using operational amplifier U5, and outputs the comparison result to the main control module in the form of a level signal, providing an important basis for the intelligent decision-making of the subway air conditioning control system.
[0060] like Figure 4 As shown, in one embodiment of this disclosure, the comparison module further includes: a variable resistor RP2, a resistor R11, and a Zener diode D1; the first terminal of the variable resistor RP2 is connected to the VCC power supply, the second terminal of the variable resistor RP2 is grounded through the resistor R11, the cathode of the Zener diode D1 is connected to the second terminal of the variable resistor RP2, the anode of the Zener diode D1 is grounded, and the cathode of the Zener diode D1 is connected to the inverting input terminal of the operational amplifier U5.
[0061] In this embodiment, the variable resistor RP2 and resistor R11 form a voltage divider circuit. By adjusting the resistance of the variable resistor RP2, the voltage division ratio can be changed, thereby changing the voltage value at the second terminal of the variable resistor RP2. When the voltage output of the voltage divider circuit is higher than the Zener diode D1's regulated voltage, the Zener diode D1 enters reverse breakdown mode, stabilizing the voltage at its regulated value. This effectively prevents large fluctuations in the reference voltage input to the inverting input terminal of the operational amplifier U5 due to power supply voltage fluctuations or other interference factors, ensuring the stability and accuracy of the reference voltage.
[0062] The voltage signal, after being divided and regulated, is sent to the inverting input of operational amplifier U5. In this way, the entire comparator module can provide stable and reliable passenger density comparison results for the subway air conditioning control system.
[0063] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.
Claims
1. A subway air conditioning control system characterized by, The application relates to a subway air conditioning system, which comprises a passenger detection module, a comparison module, a main control module, a driving module, a frequency converter, a compressor, a switch module and a temperature detection module. The passenger detection module is configured to detect the passenger density on a subway train, and the output end of the passenger detection module is connected with the first end of the comparison module, and the second end of the comparison module is connected with the main control module. The control end of the switch module is connected with the main control module, the first end of the switch module is connected with a power module, the second end of the switch module is connected with the power supply end of the temperature detection module, and the output end of the temperature detection module is connected with the main control module. The first end of the driving module is connected with the main control module, the second end of the driving module is connected with the first end of the frequency converter, and the second end of the frequency converter is connected with the compressor. The switch module comprises a first switch unit and a second switch unit, and the temperature detection module comprises a first temperature detection unit and a second temperature detection unit.
2. The subway air conditioning control system according to claim 1, wherein The control ends of the first switch unit and the second switch unit are connected with the main control module, the first ends of the first switch unit and the second switch unit are connected with the power module, the second end of the first switch unit is connected with the power supply end of the first temperature detection unit, and the second end of the second switch unit is connected with the power supply end of the second temperature detection unit. The output ends of the first temperature detection unit and the second temperature detection unit are connected with the main control module. The passenger detection module comprises a passenger density detection circuit and an adjusting circuit.
3. The subway air conditioning control system according to claim 1, wherein The passenger density detection circuit is configured to detect the passenger density in a subway train, the passenger density detection circuit is connected with the input end of the adjusting circuit, and the output end of the adjusting circuit is connected with the first end of the comparison module. The passenger density detection circuit comprises an operational amplifier U4, a triode Q1, a resistor R1, a first pressure sensor J1 and a second pressure sensor J2.
4. The subway air conditioning control system according to claim 3, wherein The non-inverting input end of the operational amplifier U4 is connected with a Vref1 reference voltage, the inverting input end of the operational amplifier U4 is grounded through the resistor R1, the output end of the operational amplifier U4 is connected with the base of the triode Q1, the collector of the triode Q1 is connected with a VEE power supply, the emitter of the triode Q1 is connected with the first input end of the first pressure sensor J1 and the second pressure sensor J2 respectively, the second input ends of the first pressure sensor J1 and the second pressure sensor J2 are connected with the inverting input end of the operational amplifier U4, and the output ends of the first pressure sensor J1 and the second pressure sensor J2 are connected with the input end of the adjusting circuit. The adjusting circuit comprises an operational amplifier U3, a resistor R7, an operational amplifier U2, a resistor R8, a resistor R9, a rheostat RP1 and an operational amplifier U1.
5. The subway air conditioning control system according to claim 4, wherein The non-inverting input end of the operational amplifier U3 is connected with the first output end of the first pressure sensor J1, the inverting input end of the operational amplifier U3 is connected with the second output end of the first pressure sensor J1, the output end of the operational amplifier U3 is connected with the inverting input end of the operational amplifier U3 through the resistor R7, and the output end of the operational amplifier U3 is connected with the inverting input end of the operational amplifier U1. The non-inverting input terminal of the operational amplifier U2 is connected to the first output terminal of the second pressure sensor J2, the inverting input terminal of the operational amplifier U2 is connected to the second output terminal of the second pressure sensor J2, the output terminal of the operational amplifier U2 is connected to the inverting input terminal of the operational amplifier U2 through the resistor R8, and the output terminal of the operational amplifier U2 is connected to the non-inverting input terminal of the operational amplifier U1; The non-inverting input terminal of the operational amplifier U1 is connected to the VRef reference voltage through the rheostat RP1, the output terminal of the operational amplifier U1 is connected to the inverting input terminal of the operational amplifier U1 through the resistor R9, and the output terminal of the operational amplifier U1 is connected to the first terminal of the comparison module.
6. The subway air conditioning control system of claim 1, wherein The comparison module comprises an operational amplifier U5. The non-inverting input terminal of the operational amplifier U5 is connected to the output of the passenger detection module, the inverting input terminal of the operational amplifier U5 is connected to a reference power supply, and the output terminal of the operational amplifier U5 is connected to the main control module.
7. The subway air conditioning control system according to claim 6, wherein The comparison module further comprises a rheostat RP2, a resistor R11 and a zener D1. The first terminal of the rheostat RP2 is connected to a VCC power supply, the second terminal of the rheostat RP2 is grounded through the resistor R11, the cathode of the zener D1 is connected to the second terminal of the rheostat RP2, the anode of the zener D1 is grounded, and the cathode of the zener D1 is connected to the inverting input terminal of the operational amplifier U5.