Air compressor detection circuit and train

Abstract

The invention provides an air compressor detection circuit and a train, and the air compressor detection circuit comprises a first detection circuit which is used for detecting a temperature electric signal of an air compressor; the second detection circuit is used for detecting a pressure electric signal of the air compressor; the main control chip is connected with the first detection circuit and the second detection circuit, and the main control chip is used for generating a temperature value and a pressure value corresponding to the air compressor according to the temperature electric signal and the pressure electric signal; therefore, the temperature value and the pressure intensity value of the air compressor and the temperature value and the pressure intensity value of the operation environment of the air compressor can be accurately obtained. According to the method, the temperature and the pressure of the running state of each flow in the running process of the wind pressure machine can be converted through the detected current value, so that a train can judge the running state of the wind pressure machine more accurately.

Description

Technical Field

[0001] The present application relates to the field of train safety technology, and in particular to an air compressor detection circuit and a train. Background Art

[0002] Trains are a means of transport for transporting people or goods, and are an important part of the modern transportation system. On trains, train air compressors are an important part of trains. Air compressors are a device used to generate compressed air, usually used to provide power for the train's brake system, air springs, windshield doors, etc.

[0003] The running state of the air compressor during train operation is also an important measure to ensure train safety. In the prior art, the running detection of the air compressor is often the detection of the internal pressure of the train, and then indirectly judges whether the air compressor is running normally.

[0004] Although this method can roughly understand the operating problems of the air compressor, it cannot accurately locate the specific problems of the air compressor, thus affecting the maintenance efficiency and leaving safety hazards. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide an air compressor detection circuit and a train with a simple structure to overcome the above-mentioned technical problems.

[0006] In a first aspect, the present application provides an air compressor detection circuit, comprising:

[0007] A first detection circuit is used to detect the temperature electrical signal of the air compressor;

[0008] The second detection circuit is used to detect the pressure electrical signal of the air compressor;

[0009] A main control chip, wherein the main control chip is connected to the first detection circuit and the second detection circuit respectively, and the main control chip is used to generate the temperature value and pressure value corresponding to the air compressor according to the temperature electrical signal and the pressure electrical signal, so as to accurately obtain the temperature value and pressure value of the air compressor and the temperature value and pressure value of the operating environment of the air compressor.

[0010] It can be understood that by setting up the first detection circuit and the second detection circuit, passing the temperature and air pressure signals and returning the current value, the current value is converted into a temperature value and a pressure value through the chip, and then the accurate data of the temperature and air pressure of the air compressor and the air compressor operating environment can be further intuitively tested, and the operating status of the air compressor can be further and more accurately judged. This circuit can also be used to detect the functions of other parts of the train.

[0011] In a possible embodiment, the main control chip is provided with a first detection end and a second detection end; the first detection end is connected to the first detection circuit, and the second detection end is connected to the second detection circuit.

[0012] In a possible embodiment, the first detection circuit includes: a first detection sensor and a first signal amplification circuit;

[0013] The output end of the first detection sensor is connected to the input end of the first signal amplifying circuit;

[0014] The first detection sensor is used to detect the temperature electrical signal of the air compressor and transmit the temperature electrical signal to the first signal amplification circuit;

[0015] The output end of the first signal amplifying circuit is connected to the first detection end, and the first signal amplifying circuit is used to amplify the temperature electrical signal and transmit it to the main control chip.

[0016] In a possible embodiment, the first signal amplifying circuit includes an operational amplifier, a first protection circuit and a second protection circuit;

[0017] The operational amplifier comprises a first terminal and a second terminal;

[0018] The first detection end is connected to the output end of the first protection circuit, and the input end of the first protection circuit is connected to the first wiring terminal; the second wiring terminal is connected to the output end of the second protection circuit, and the input end of the second protection circuit is connected to the first detection sensor or the second detection sensor.

[0019] It can be understood that by setting up two protection circuits and an operational amplifier to protect the signal amplifier, the signal is amplified at the same time, so that by detecting a smaller current value, it can be further converted into a calculable numerical value and converted into pressure or temperature.

[0020] In a possible embodiment, the first protection circuit includes a first diode, a first power input terminal, a first capacitor and a first resistor;

[0021] The first detection end is respectively connected to one end of the first diode, one end of the first capacitor and one end of the first resistor;

[0022] The first power input terminal is connected to the other end of the first diode, the other end of the first resistor is connected to the first wiring terminal, and the other end of the first capacitor is grounded.

[0023] It can be understood that the first diode is provided in the first protection circuit to prevent the reverse voltage from flowing to the operational amplifier and protect the circuit, and the RC filter is provided to further improve the accuracy of the signal.

[0024] In a possible embodiment, the second protection circuit includes a second resistor, a third resistor, a second capacitor, a fourth resistor and a second diode;

[0025] The second wiring terminal is respectively connected to the second resistor, the third resistor and one end of the second capacitor;

[0026] The other end of the third resistor is connected to one end of the fourth resistor and the second diode respectively;

[0027] The other ends of the second resistor, the fourth resistor, the second capacitor and the second diode are grounded.

[0028] It is understandable that multiple resistors and second capacitors are provided for protection and filtering, and a second diode is also provided to prevent the occurrence of instantaneous voltage due to voltage reverse, and the amplification ratio is adjusted according to the change in the size of the resistor.

[0029] In a possible embodiment, it further includes a state detection circuit, wherein the state detection circuit is provided with a first optical coupler and a state detection sensor; the main control chip is provided with a state input terminal;

[0030] The first optocoupler input terminal is connected to the state detection sensor, and the first optocoupler output terminal is connected to the state input terminal.

[0031] It can be understood that when an abnormality occurs in the detection part, the status detection sensor feeds back an electrical signal to detect whether the relay of the wind compressor or the related operating environment is operating normally, and an optical coupler is provided for electrical isolation to reduce circuit noise.

[0032] In a possible embodiment, it further includes a switch control circuit, wherein the switch control circuit is provided with a control switch, a switch chip and a second optical coupler; the main control chip is provided with a switch control terminal;

[0033] The switch control end is connected to the input end of the second optocoupler, the output end of the second optocoupler is connected to the input end of the switch chip, and the output end of the switch chip is connected to the control switch.

[0034] It can be understood that by setting up a control switch circuit, when the train is abnormal, the control switch circuit can be used to control the on and off of the relay or switch, thereby preventing accidents caused by abnormal operation.

[0035] In a possible embodiment, it further includes a power supply voltage drop circuit, wherein the power supply voltage drop circuit is provided with a first voltage drop chip, a second voltage drop chip, and a second power supply output terminal;

[0036] The input end of the first voltage drop chip is connected to an external power supply, the output end of the first voltage drop chip is connected to the input end of the second voltage drop chip, and the second voltage drop chip is provided with a second power supply output end and outputs power to the outside through the second power supply output end.

[0037] It can be understood that a power supply voltage drop circuit is provided to convert the input voltage into a low voltage output through a voltage drop chip to provide power supply for circuits requiring low voltage.

[0038] In a possible embodiment, it further includes a network communication circuit, which includes a first lightning arrester, a second lightning arrester, a voltage suppression chip, a communication chip, and a communication connector; the communication chip is provided with a communication terminal; the first lightning arrester is provided with a first lightning arrester terminal, a second lightning arrester terminal, and a third lightning arrester terminal; the second lightning arrester is provided with a fourth lightning arrester terminal, a fifth lightning arrester terminal, and a sixth lightning arrester terminal;

[0039] The communication terminal is connected to the input terminal of the voltage suppression chip, the output terminal of the voltage suppression chip is connected to the input terminal of the communication chip, the output terminal of the communication chip is connected to the first lightning protection terminal, the fourth lightning protection terminal, the third lightning protection terminal, and the sixth lightning protection terminal is connected to the communication port;

[0040] The second lightning protection terminal and the fifth lightning protection terminal are grounded.

[0041] It can be understood that the network communication circuit provides Ethernet network communication for the overall circuit through the communication chip, so that the data of the main control chip can be transmitted to external devices through Ethernet, and further, when the wind compressor operates abnormally, an alarm can be issued or maintenance can be carried out with the assistance of data.

[0042] In a possible embodiment, the SPI interface circuit includes an SPI chip, and the main control chip includes a first connection terminal, a second connection terminal, a third connection terminal, and a fourth connection terminal; the main control chip is provided with a first connection terminal, a second connection terminal, a third connection terminal, and a fourth connection terminal; and the output terminal of the SPI chip is respectively connected to the first connection terminal, the second connection terminal, the third connection terminal, and the fourth connection terminal.

[0043] It can be understood that, through the SPI interface, the circuit has a full-duplex synchronous serial peripheral interface, through which communication can be performed with external devices such as sensors, detectors and the like.

[0044] In a second aspect, the present application also provides a train, comprising an air compressor detection circuit as described in one of the first aspects.

[0045] It can be understood that the train can realize real-time detection of the temperature and pressure data of the wind compressor through the above-mentioned circuit, and convert the acquired current value into the corresponding temperature or voltage value, thereby assisting the crew to judge the operating status of the wind compressor.

[0046] Beneficial effects:

[0047] The present application provides an air compressor detection circuit and train, which, by setting a first detection circuit and a second detection circuit, detects the operating status of the air compressor in the form of a current value, which is amplified and fed back to the main control chip. The main control chip converts the detected current value into a temperature or air pressure value through a built-in conversion program, and feeds back the value for display to assist the train in fault judgment. In the above manner, the temperature and pressure of each process operating status of the air compressor are converted through the detected current value, so that the train can judge the operating status of the air compressor more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic diagram of the structure of an air compressor detection circuit provided in an embodiment of the present application;

[0049] Figure 2 for Figure 1 A circuit diagram of a first detection circuit and a second detection circuit in a detection circuit of an air compressor shown;

[0050] Figure 3 for Figure 1 A state detection circuit diagram in an air compressor detection circuit shown;

[0051] Figure 4 for Figure 1 A switch control circuit diagram in an air compressor detection circuit shown;

[0052] Figure 5 for Figure 1 A power supply voltage drop circuit in an air compressor detection circuit shown Figure 1 ;

[0053] Figure 6 for Figure 1 A power supply voltage drop circuit in an air compressor detection circuit shown Figure 2 ;

[0054] Figure 7 for Figure 1 A diagram of a main control chip in an air compressor detection circuit is shown;

[0055] Figure 8 for Figure 1 A network communication circuit diagram in an air compressor detection circuit shown;

[0056] Fig. 9 for Figure 1 The SPI interface circuit diagram in an air compressor detection circuit is shown.

[0057] Reference numerals:

[0058] a. The first protection circuit;

[0059] b. The second protection circuit;

[0060] U1, main control chip; U1_3V3, first power input terminal; JP1_1, first detection sensor; JP1_2, second detection sensor; U1_35, intake temperature detection terminal; U1_32, exhaust temperature detection terminal; U1_36, head pressure detection terminal; U1_25, lubricating oil temperature detection terminal; U1_76, exhaust temperature detection terminal; U1_79, pressure switch status terminal; U1_80, air compressor normal start status terminal; U1_81, low temperature status terminal; U1_82, air transport solenoid valve status terminal; U1_78, temperature switch status terminal; U1_43, switch control terminal; U1_14, first chip network sending terminal; U1_15, second chip network sending terminal; U1_12, first chip network reading terminal; U1_13, second chip network reading terminal;

[0061] U2, operational amplifier; D1, first diode; D2, second diode; C1, first capacitor; C2, second capacitor; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor;

[0062] U3, first optocoupler; R5, fifth resistor; R6, sixth resistor; U3_1, first optocoupler power input terminal; U3_2, first optocoupler input terminal; U3_3, first optocoupler ground terminal; U3_4, first optocoupler output terminal; JP2_1, first detection terminal;

[0063] U4, second optocoupler; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; F1, first fuse; U4_1, second optocoupler input terminal; U4_2, second optocoupler power input terminal; U4_3, second optocoupler output terminal; U4_4, second optocoupler ground terminal;

[0064] U5, switch chip; U5_1, first switch input terminal; U5_2, first switch output terminal; U5_3, second ground terminal; U5_4, second switch output terminal; JP3_1, control switch;

[0065] U6, first voltage drop chip; F2, second fuse; MOV1, varistor; D3, third diode; C3, third capacitor; C4, fourth capacitor; L1, first inductor; U6_1, positive terminal; U6_2, negative terminal; U6_3, first voltage drop ground terminal; U6_4, first voltage drop output terminal;

[0066] U7, second voltage drop chip; F3, third fuse; DT, voltage regulator diode; L2, second inductor; C5, fifth capacitor; C6, sixth capacitor; D4, fourth diode; L3, third inductor; C7, seventh capacitor; C8, eighth capacitor; U7_1, second voltage drop input terminal; U7_2, second voltage drop first output terminal; U7_3, second voltage drop second output terminal; U7_4, second voltage drop ground terminal;

[0067] J4, external power supply; J4_1, positive input terminal; J4_2, negative input terminal; J4_3, power ground terminal;

[0068] U8, voltage suppression chip; R10, tenth resistor; R11, eleventh resistor; R12, twelfth resistor; R13, thirteenth resistor; R14, fourteenth resistor; R15, fifteenth resistor; C9, ninth capacitor; U8_1, fourth transmission output terminal; U8_2, fifth transmission output terminal; U8_3, fourth read input terminal; U8_4, fifth read input terminal; U8_5, first transmission communication terminal connection; U8_6, second transmission communication terminal connection; U8_7, first communication read terminal connection; U8_8, second communication read terminal connection;

[0069] U9, communication chip; U9_2, second transmission output terminal; U9_3, third transmission output terminal; U9_4, first transmission input terminal; U9_5, second transmission input terminal; U9_6, third transmission input terminal; U9_7, first read output terminal; U9_8, second read output terminal; U9_9, third read output terminal; U9_1, first transmission output terminal; U9_10, first read input terminal; U9_11, second read input terminal; U9_12, third read input terminal;

[0070] J5, communication connector; J5_1, first external network reading terminal; J5_2, second external network reading terminal; J5_3, first external network sending terminal; J5_4, second external network sending terminal; J5_5, external grounding terminal;

[0071] D5, first lightning arrester; D5_1, first lightning arrester terminal; D5_2, second lightning arrester terminal; D5_3, third lightning arrester terminal;

[0072] D6, second lightning arrester; D6_1, fourth lightning arrester terminal; D6_2, fifth lightning arrester terminal; D6_3, sixth lightning arrester terminal;

[0073] U10, SPI chip; U1_85, first connection terminal; U1_86, second connection terminal; U1_83, third connection terminal; U1_84, fourth connection terminal; U10_5, SPI power input terminal; U10_6, SPI ground terminal; U10_1, fifth interface; U10_2, sixth interface; U10_3, seventh interface; U10_4, eighth interface;

[0074] C10, the tenth capacitor. DETAILED DESCRIPTION

[0075] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0076] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0077] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the specification, claims, and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include", "may include", "include", or "may include" used in this application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the terms "include" or "include" indicate the existence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0078] like Figure 1-9 As shown, an air compressor detection circuit provided in an embodiment of the present application includes: a first detection circuit, a second detection circuit and a main control chip U1. Among them, the first detection circuit is used to detect the temperature electrical signal of the air compressor; the second detection circuit is used to detect the pressure electrical signal of the air compressor; the main control chip U1, the main control chip U1 is connected to the first detection circuit and the second detection circuit respectively, and the main control chip U1 is used to generate the temperature value and pressure value corresponding to the air compressor according to the temperature electrical signal and the pressure electrical signal, so as to accurately obtain the temperature value and pressure value of the air compressor and the temperature value and pressure value of the operating environment of the air compressor.

[0079] Optionally, the main control chip U1 is provided with a first detection end and a second detection end; the first detection end is connected to the first detection circuit, and the second detection end is connected to the second detection circuit.

[0080] Optionally, the first detection circuit includes: a first detection sensor JP1_1 and a first signal amplification circuit;

[0081] The output end of the first detection sensor JP1_1 is connected to the input end of the first signal amplifying circuit;

[0082] The first detection sensor JP1_1 is used to detect the temperature electrical signal of the air compressor and transmit the temperature electrical signal to the first signal amplification circuit;

[0083] The output end of the first signal amplifying circuit is connected to the first detection end, and the first signal amplifying circuit is used to amplify the temperature electrical signal and transmit it to the main control chip U1.

[0084] Optionally, the first detection circuit and the second detection circuit include multiple ones, and respectively detect the head pressure, lubricating oil temperature, intake temperature, and exhaust temperature of the air compressor, and the temperature and air pressure are detected. After being amplified by the first signal amplification circuit and the second signal amplification circuit, respectively, they are transmitted to the main control chip U1, and the main control chip U1 further judges the received current data.

[0085] Alternatively, if Figure 7 As shown, the main control chip U1 includes an intake temperature detection terminal U1_35 for detecting the intake temperature, an exhaust temperature detection terminal U1_76 / U1_32, a head pressure detection terminal U1_36, and a lubricating oil temperature detection terminal U1_25.

[0086] As a more preferred solution of this embodiment, a plurality of reserved detection ports are provided in the main control chip U1, which are used for connecting the detection circuit to improve the effect of the entire detection when further detection is needed in the future, and a third detection module which can convert current into humidity is also provided.

[0087] like Figure 2 As shown, in a possible embodiment, the first signal amplifying circuit includes an operational amplifier U2, a first protection circuit a and a second protection circuit b;

[0088] The operational amplifier U1 includes a first terminal and a second terminal;

[0089] The first detection terminal JP2_1 is connected to the output terminal of the first protection circuit a, and the input terminal of the first protection circuit a is connected to the first wiring terminal; the second wiring terminal is connected to the output terminal of the second protection circuit b, and the input terminal of the second protection circuit b is connected to the first detection sensor JP1_1 or the second detection sensor JP1_2.

[0090] Optionally, the first detection sensor JP1_1 is used to detect temperature changes, and the second detection sensor JP1_2 is used to detect air pressure changes or pressure intensity changes.

[0091] In some optional embodiments, the operational amplifier U2 may select LM2902, or other multi-channel amplifier chips, and the first protection circuit, the second protection circuit and the operational amplifier U2 are connected in a forward connection or a reverse connection. In this embodiment, the first terminal is the negative terminal of the diode, and the second terminal is the positive terminal of the diode. While protecting the operational amplifier U2, the first protection circuit and the second protection circuit also have the functions of filtering and changing the resistance ratio to achieve a change in the amplification factor.

[0092] The beneficial effect of this step is that the signal amplification circuit includes two protection circuits and an operational amplifier U2 to protect the signal amplifier and amplify the signal at the same time so that by detecting a smaller current value, it can be further converted into a calculable value and converted into pressure or temperature.

[0093] In some embodiments, please refer to Figure 2 As shown, the first protection circuit includes a first diode D1, a first power input terminal U1_3V3, a first capacitor C1, and a first resistor R1;

[0094] The first detection terminal JP2_1, one end of the first diode D1, one end of the first capacitor C1 and one end of the first resistor R1 are connected, the first power input terminal U1_3V3 is connected to the other end of the first diode D1, the other end of the first resistor R1 is connected to the first wiring terminal, and the other end of the first capacitor C1 is grounded.

[0095] Specifically, the first diode D1 can be set as a silicon epitaxial planar diode, which can prevent reverse voltage or surge, and can be used for signal replacement of related diodes such as models 1N4148, 1N4148-1N9141N4448-1N914B, etc., to prevent the voltage of the first power input terminal U1_3V3 from being reversed and causing damage to the operational amplifier U2. The first power input terminal U1_3V3 is a 3.3V chip input.

[0096] A high-pass filter is set up by the first capacitor C1 and the first resistor R1. The first resistor R1 is set to 1000K and the first capacitor C1 is set to 1000PF respectively, which can prevent low-frequency signal interference.

[0097] The beneficial effect of the circuit is that, since the detection current is usually small, taking out the low-frequency signal is more beneficial to improving the accuracy of the low-frequency signal of the circuit.

[0098] The first protection circuit is provided with a first diode D1 to prevent a reverse voltage from flowing to the operational amplifier U2 and protect the circuit, and an RC filter is provided to further improve the accuracy of the signal.

[0099] In some embodiments, please refer to Figure 2As shown, the second protection circuit includes a second resistor R2, a third resistor R3, a second capacitor C2, a fourth resistor R4, and a second diode D2;

[0100] The second wiring terminal, the second resistor R2, the third resistor R3, and one end of the second capacitor C2 are connected, the other end of the third resistor R3, one end of the fourth resistor R4, and one end of the second diode D2 are respectively connected to the first detection sensor JP1_1 or the second detection sensor JP1_2, and the other ends of the third resistor R3, the fourth resistor R4, the second capacitor C2, and the second diode D2 are grounded.

[0101] Specifically, the second protection circuit includes a filtering protection circuit composed of multiple resistors and capacitors, wherein the second resistor R2 is set to 2K, the third resistor R3 is set to 2K, the fourth resistor R4 is set to 250 ohms, and the second capacitor C2 is set to 1000PF. Through the above settings, a high-low pass mixed filter circuit is formed. At the same time, the resistors also play a role in protecting the circuit, and the amplification ratio is adjusted by changing the resistance size. The second diode D2 is set to a voltage regulator diode DT to prevent and stabilize the voltage. SMBJ6.5A model and diodes with the same electrical properties can be selected.

[0102] A plurality of resistors and a second capacitor C2 are provided for protection and filtering, and a second diode D2 is also provided to prevent the occurrence of a reverse voltage instantaneous voltage. The amplification ratio is adjusted by changing the size of the resistor.

[0103] Optionally, the second detection circuit includes: a second detection sensor and a second signal amplifying circuit. The output end of the second detection sensor is connected to the input end of the second signal amplifying circuit, the output end of the second signal amplifying circuit is connected to the second detection end, and the second signal amplifying circuit is used to amplify the temperature electrical signal and transmit it to the main control chip U1.

[0104] It should be noted that the specific structure of the second signal amplifying circuit is the same as the circuit structure of the first signal amplifying circuit, and will not be described in detail herein.

[0105] In some embodiments, Figure 3 As shown, the air compressor detection circuit also includes a state detection circuit, which is provided with a first optical coupler U3 and a state detection sensor; the main control chip U1 is provided with a state input terminal;

[0106] The first optocoupler output terminal U3_1 is connected to the state detection sensor, and the first optocoupler output terminal U3_4 is connected to the state input terminal.

[0107] Specifically, the state detection circuit is provided with a fifth resistor R5, a sixth resistor R6, a first optical coupler U3, and a power input terminal;

[0108] The first optocoupler U3 includes a first optocoupler output terminal U3_1, a first optocoupler output terminal U3_2, a first optocoupler output terminal U3_3, and a first optocoupler output terminal U3_4;

[0109] One end of the fifth resistor R5 is connected to the status detection sensor, the other end of the fifth resistor R5 is connected to the first optocoupler output terminal U3_2, the first optocoupler output terminal U3_1 is connected to the second power supply input terminal, the first optocoupler output terminal U3_4 is connected to one end of the sixth resistor R6 and the chip status input terminal, the other end of the sixth resistor R6 is connected to the first power supply input terminal U1_3V3 and the status input terminal; the first optocoupler output terminal U3_3 is grounded.

[0110] Among them, the input voltage of the first power input terminal U1_3V3 is 3.3V, the second power input terminal is a 24V power supply, the first optocoupler U3 preferably uses a TLP184 chip, and other optocouplers such as EL357 are optional. The fifth resistor R5 can be selected as 2.7K, and the sixth resistor R6 can be selected as 1K. The status detection sensor can be used for electrical control box detection and output to the status detection circuit.

[0111] Furthermore, the state detection circuit includes multiple state sensors, wherein the state sensor output signal includes a pressure switch state signal, an air compressor normal start signal, a low temperature switch state signal, an idling solenoid valve state signal, and a temperature switch state signal.

[0112] Correspondingly, the status input terminal of the main control chip includes the pressure switch status terminal U1_79, the air compressor normal start status terminal U1_80, the low temperature status terminal U1_81, the air transport solenoid valve status terminal U1_82, and the temperature switch status terminal U1_78.

[0113] In some preferred cases, multiple state monitoring terminals are reserved for detecting multiple states through state monitoring circuits.

[0114] The status detection circuit uses the status detection sensor. When an abnormality occurs in the detection part, the status detection sensor feeds back an electrical signal to detect whether the relay of the wind compressor or the related operating environment is operating normally, and an optical coupler is provided for electrical isolation to reduce circuit noise.

[0115] In some embodiments, Figure 4 As shown, it also includes a switch control circuit, which is provided with a control switch JP3_1, a switch chip U5, and a second optical coupler U4; the main control chip U1 is provided with a switch control terminal U1_43;

[0116] The switch control terminal U1_43 is connected to the second optocoupler input terminal, the second optocoupler output terminal is connected to the input terminal of the switch chip U5, and the output terminal of the switch chip U5 is connected to the control switch JP3_1.

[0117] Specifically, the switch control circuit includes a second optocoupler U4, a switch chip U5, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a first fuse F1; the second optocoupler U4 includes a second optocoupler input terminal U4_1, a second optocoupler power input terminal U4_2, a second optocoupler output terminal U4_3, and a second optocoupler ground terminal U4_4; the switch chip U5 includes a first switch input terminal U5_1, a first switch output terminal U5_2, a second ground terminal U5_3, and a second switch output terminal U5_4;

[0118] The second optocoupler input terminal U4_1 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the switch control terminal U1_43, the second optocoupler U4 power input terminal is connected to the second power input terminal, the second optocoupler output terminal U4_3 is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to the ninth resistor R9 and the first switch input terminal U5_1, the first switch output terminal U5_2 and the second switch output terminal U5_4 are connected to one end of the first fuse F1, and the other end of the first fuse F1 is connected to the control switch JP3_1;

[0119] The other end of the ninth resistor R9, the second ground end U5_3 and the second optocoupler ground end U4_4 are grounded.

[0120] The second optical coupler U4 preferably uses an EL357 chip, and other optical couplers such as TLP184 are optional. The switch chip U5 is preferably WSP6946, which is provided with two sets of switches for use in a multi-way switch control circuit, and a single set or four sets of switch chips U5 are optional. The seventh resistor R7 can be selected as 470 ohms, the eighth resistor R8 and the ninth resistor R9 can be selected as 10K resistors, and the first fuse F1 is preferably JK-MSMD110-33V, and the optional fuses are fuses with the same or similar electrical properties.

[0121] Furthermore, the switch control circuit includes multiple paths, which are connected and controlled with the external control switch JP3_1 or the relay.

[0122] By setting the control switch JP3_1 circuit, when the train is abnormal, the control switch JP3_1 circuit can be used to control the on and off of the relay or switch, thereby preventing accidents caused by abnormal operation.

[0123] In some embodiments, Figure 5-6 As shown, the air compressor detection circuit also includes a power supply voltage drop circuit, which is provided with a first voltage drop chip U6, a second voltage drop chip U7, and a second power supply output terminal;

[0124] The input end of the first voltage drop chip U6 is connected to the external power supply J4, the output end of the first voltage drop chip U6 is connected to the input end of the second voltage drop chip U7, and the second voltage drop chip U7 is provided with a second power supply output end and outputs power to the outside through the second power supply output end.

[0125] Specifically, the voltage drop circuit includes a first voltage drop chip U6, a second fuse F2, a varistor MOV1, a third diode D3, a third capacitor C3, a fourth capacitor C4, a first inductor L1, a second voltage drop chip U7, a third fuse F3, a voltage regulator diode DT, a second inductor L2, a fifth capacitor C5, a sixth capacitor C6, a fourth diode D4, a third inductor L3, a seventh capacitor C7, and an eighth capacitor C8; the first voltage drop chip U6 includes a positive terminal U6_1, a negative terminal U6_2, a first voltage drop ground terminal U6_3, and a first voltage drop output terminal U6_4; the second voltage drop chip U7 includes a second voltage drop input terminal U7_1, a second voltage drop first output terminal U7_2, a second voltage drop second output terminal U7_3, and a second voltage drop ground terminal U7_4; the external power supply J4 is provided with a positive input terminal J4_1, a negative input terminal J4_2, and a power ground terminal J4_3;

[0126] The positive input terminal J4_1 is connected to one end of the second fuse F2, the other end of the second fuse F2 is connected to the varistor MOV1 and one end of the third diode D3, the other end of the diode is connected to the third capacitor C3 and the second inductor L2, the other end of the second inductor L2 is connected to one end of the fourth capacitor C4 and the positive terminal U6_1, the negative input terminal J4_2, the other end of the varistor MOV1, the other end of the third capacitor C3, the other end of the fourth capacitor C4 and the negative terminal U6_2 are connected, and the first voltage drop output terminal U6_4 is connected to the first voltage drop output terminal U6_4. One end of the third fuse F3 is connected, the other end of the third fuse F3 is connected to one end of the voltage stabilizing diode DT, one end of the second inductor L2, the other end of the second inductor L2, one end of the fifth capacitor C5, one end of the sixth capacitor C6, the second voltage drop input terminal U7_1 and the 24V input terminal, the second voltage drop first output terminal U7_2 is connected to one end of the fourth diode D4, one end of the third inductor L3, the other end of the third inductor L3, one end of the seventh capacitor C7, one end of the eighth capacitor C8, and the second voltage drop second output terminal U7_3 are connected;

[0127] The first voltage drop ground terminal U6_3, the second voltage drop ground terminal U7_4, the other end of the voltage zener diode DT, the other end of the fifth capacitor C5, the other end of the sixth capacitor C6, the other end of the fourth diode D4, the other end of the seventh capacitor C7 and the other end of the eighth capacitor C8, and the power ground terminal J4_3 are grounded.

[0128] Among them, the external input power supply is 110V, the first voltage drop chip U6 can be selected from WRB11024MD-6W, the second voltage drop chip U7 can be selected from LM2596-5.0 and converted to 24V voltage or 5V output. Furthermore, the varistor MOV1 can be selected from 14D181K, the third capacitor C3 and the fourth capacitor C4 can be selected from polarized capacitors 10uF, the third fuse F3 can be selected from nSMD035-33V, the voltage regulator diode DT can be selected from SMBJ26CA, the sixth capacitor C6 and the eighth capacitor C8 are lower capacitors, the fifth capacitor C5 and the seventh capacitor C7 are polarized capacitors, and the capacitors in this circuit can usually be used as filter capacitors and prevent

[0129] The power supply voltage drop circuit converts the input voltage into a low voltage output through a voltage drop chip to provide power supply for circuits that require low voltage.

[0130] In some embodiments, Figure 8 As shown, it also includes a network communication circuit, which includes a first lightning arrester D5, a second lightning arrester D6, a voltage suppression chip U8, a communication chip U9, and a communication connector J5; the chip is provided with a communication terminal; the first lightning arrester D5 is provided with a first lightning arrester terminal D5_1, a second lightning arrester terminal D5_2, and a third lightning arrester terminal D5_3; the second lightning arrester D6 is provided with a fourth lightning arrester terminal D6_1, a fifth lightning arrester terminal D6_2, and a sixth lightning arrester terminal D6_3;

[0131] The communication terminal is connected to the input terminal of the voltage suppression chip U8, the output terminal of the voltage suppression chip U8 is connected to the input terminal of the communication chip U9, and the output terminal of the communication chip U9 is connected to the first lightning protection terminal D5_1, the third lightning protection terminal D5_3, the fourth lightning protection terminal D6_1, and the sixth lightning protection terminal D6_3 connected to the communication port;

[0132] The second lightning protection terminal D5_2 and the fifth lightning protection terminal D6_2 are grounded.

[0133] Specifically, the network communication circuit includes a communication chip U9, a first lightning arrester D5, a second lightning arrester D6, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a ninth capacitor C9, and a voltage suppression chip U8;

[0134] The communication chip U9 includes a first transmission output terminal U9_1, a second transmission output terminal U9_2, a third transmission output terminal U9_3, a first transmission input terminal U9_4, a second transmission input terminal U9_5, and a third transmission input terminal U9_6; a first read output terminal U9_7, a second read output terminal U9_8, a third read output terminal U9_9, a first read input terminal U9_10, a second read input terminal U9_11, and a third read input terminal U9_12;

[0135] The voltage suppression chip U8 includes a fourth transmitting output terminal U8_1, a fifth transmitting output terminal U8_2, a fourth reading input terminal U8_3, and a fifth reading input terminal U8_4; the external network connection terminal includes an external first external network reading terminal J5_1, a second external network reading terminal J5_2, a first external network sending terminal J5_3, a second external network sending terminal J5_4, and an external ground terminal J5_5; the chip network connection terminal includes a first chip network sending terminal U1_14, a second chip network sending terminal U1_15, a first chip network reading terminal U1_12, and a second chip network reading terminal U1_13; the network communication terminal includes a first transmitting communication terminal, a second transmitting communication terminal, a first reading communication terminal, and a second reading communication terminal.

[0136] The first external network reading terminal J5_1 is connected to the first lightning protection terminal D5_1 and one end of the tenth resistor R10; the other end of the tenth resistor R10 is connected to the first sending output terminal U9_1; the second external network reading terminal J5_2 is connected to one end of the eleventh resistor R11 and the third lightning protection terminal D5_5; the other end of the eleventh resistor R11 is connected to the second sending output terminal U9_2; the first external network sending terminal J5_3 is connected to the fourth lightning protection terminal D6_1 and one end of the twelfth resistor R12; the other end of the twelfth resistor R12 is connected to the first reading input terminal U9_10; the second external network sending terminal J5_4 is connected to the sixth lightning protection terminal D6_3 and one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected to the second reading input terminal U9_11; the third sending output terminal U9_3 is connected to one end of the fourteenth resistor R14; the other end of the fourteenth resistor R14 is connected to one end of the ninth capacitor C9; The third read input terminal U9_12 is connected to one end of the fifteenth resistor R15; the other end of the fifteenth resistor R15 is connected to one end of the ninth capacitor C9; the first sending input terminal U9_4 is connected to the fourth sending output terminal U8_1; the second sending input terminal U9_5 is connected to the fifth sending output terminal U8_2; the fourth read input terminal U8_3 is connected to the first read output terminal U9_7; the fifth read input terminal U8_4 is connected to the second read output terminal U9_8; the third sending input terminal U9_6 and the third read output terminal U9_9 are connected to the external power supply J4; the first chip network sending terminal U1_14 is connected to the first sending communication terminal U8_5; the second chip network sending terminal U1_15 is connected to the second sending communication terminal U8_6; the first chip network reading terminal U1_12 is connected to the first communication reading terminal U8_7; the second chip network reading terminal U1_13 is connected to the second communication reading terminal U8_8;

[0137] The other end of the ninth capacitor C9, the second lightning protection terminal D5_2, the fifth lightning protection terminal D6_2, and the external grounding terminal J5_5 are grounded.

[0138] Specifically, the lightning arrester can be selected as B3D090L, the voltage suppression chip U8 can be selected as SLVU2.8-4, the communication chip U9 can be selected as 11FB-05NL, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, and the thirteenth resistor R13 are used to protect the reading end and the sending end, and the fourteenth resistor R14 and the fifteenth resistor R15 are further combined with the resistors to form a filter through the ninth capacitor C9, thereby reducing interference with the network signal.

[0139] Among them, in the communication chip U9, the first transmitting input terminal U9_4 is TD+, the first transmitting output terminal U9_1 is TX+, the third transmitting input terminal U9_6 is TDC, the third transmitting output terminal U9_3 is TXC, the second transmitting input terminal U9_5 is TD-, the third transmitting input terminal U9_6 is TX-, the first reading output terminal U9_7 is RD+, the second reading output terminal U9_8 is RD+, the third reading output terminal U9_9 is RDC, the first reading input terminal U9_10 is RX+, the second reading input terminal U9_11 is RX-, and the third reading input terminal U9_12 is RXC.

[0140] The network communication circuit provides Ethernet communication for the overall circuit through the communication chip U9, so that the data of the main control chip U1 can be transmitted to external devices through Ethernet. Further, when the wind compressor operates abnormally, an alarm can be issued or maintenance can be performed with the assistance of data.

[0141] The main control chip U1 is provided with a reading channel and a sending channel for network communication, which are transmitted through the communication chip U9 to convert the external communication signal into a chip-readable signal.

[0142] In some embodiments, Fig. 9 As shown, the SPI interface circuit includes an SPI chip U10, and the main control chip U1 includes a first connection terminal U1_85, a second connection terminal U1_86, a third connection terminal U1_83, and a fourth connection terminal U1_84; the first connection terminal U1_85, the second connection terminal U1_86, the third connection terminal U1_83, and the fourth connection terminal U1_84; the output end of the SPI chip is respectively connected to the first connection terminal U1_85, the second connection terminal U1_86, the third connection terminal U1_83, and the fourth connection terminal U1_84. The SPI chip U10 includes a fifth interface U10_1, a sixth interface U10_2, a seventh interface U10_3, and an eighth interface U10_4 connected to the main control chip U1.

[0143] Specifically, the SPI chip U10 also includes an SPI power input terminal and an SPI ground terminal U10_6, the SPI power input terminal is connected to a 3.3V power supply, and the SPI ground terminal U10_6 is grounded through a tenth capacitor C10. The first connection terminal U1_85 is connected to the fifth interface U10_1, the third connection terminal U1_83 is connected to the seventh interface U10_3, and the fourth connection terminal U1_84 is connected to the eighth interface U10_4 to achieve Ethernet communication, wherein the fifth interface U10_1 is the CS interface of the SPI chip U10, the sixth interface U10_2 is the D0 interface, the seventh interface U10_3 is the CLK clock interface, the eighth is the DI interface, and the HOLD interface of the SPI chip U10 is connected to the 3.3V power supply, and the WP interface is grounded.

[0144] Optionally, the SPI chip U10 can select 25Q128.

[0145] Through the SPI interface, the circuit has a full-duplex synchronous serial peripheral interface, through which external devices such as sensors, detectors and other devices can communicate.

[0146] In some embodiments, the fault detection circuit also includes a CAN bus interface and is provided with an optical coupler to reduce circuit noise.

[0147] Based on the same inventive concept, this example proposes a train, including the above-mentioned air compressor detection circuit.

[0148] Specifically, the air compressor detection circuit detects the operating state and operating environment of the air compressor through the control electric box, and the state detection detected by the electric control box in the air compressor detection circuit is fed back to the main control chip U1 for fault judgment; the temperature and air pressure values ​​of the air compressor operation and operating environment are detected by the first detection circuit and the second detection circuit and transmitted to the main control chip U1 in the form of current value, and converted into temperature and air pressure display output according to the detected current for auxiliary judgment, and the external control switch JP3_1 or relay is controlled to be turned off through the switch control circuit to control the operation of the air compressor and prevent the air compressor from operating faultily. Further, the circuit low voltage is provided through the voltage drop circuit, and the network communication circuit, SPI and CAN bus realize the air compressor detection circuit to exchange data with the outside.

[0149] It should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0150] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0151] It should be understood that the application of this application is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of this application still fall within the scope covered by this application.

Claims

1. An air compressor detection circuit, characterized in that: include: A first detection circuit is used to detect the temperature electrical signal of the air compressor; The second detection circuit is used to detect the pressure electrical signal of the air compressor; A main control chip, wherein the main control chip is connected to the first detection circuit and the second detection circuit respectively, and the main control chip is used to generate the temperature value and pressure value corresponding to the air compressor according to the temperature electrical signal and the pressure electrical signal, so as to accurately obtain the temperature value and pressure value of the air compressor and the temperature value and pressure value of the operating environment of the air compressor.

2. The air compressor detection circuit according to claim 1, characterized in that: The main control chip is provided with a first detection end and a second detection end; the first detection end is connected to the first detection circuit, and the second detection end is connected to the second detection circuit.

3. The air compressor detection circuit according to claim 2, characterized in that: The first detection circuit includes: a first detection sensor and a first signal amplification circuit; The output end of the first detection sensor is connected to the input end of the first signal amplifying circuit; The first detection sensor is used to detect the temperature electrical signal of the air compressor and transmit the temperature electrical signal to the first signal amplification circuit; The output end of the first signal amplifying circuit is connected to the first detection end, and the first signal amplifying circuit is used to amplify the temperature electrical signal and transmit it to the main control chip.

4. The air compressor detection circuit according to claim 3, characterized in that: The first signal amplifying circuit includes an operational amplifier, a first protection circuit and a second protection circuit; The operational amplifier comprises a first terminal and a second terminal; The first detection end is connected to the output end of the first protection circuit, and the input end of the first protection circuit is connected to the first wiring terminal; the second wiring terminal is connected to the output end of the second protection circuit, and the input end of the second protection circuit is connected to the first detection sensor or the second detection sensor.

5. The air compressor detection circuit according to claim 4, characterized in that: The first protection circuit includes a first diode, a first power input terminal, a first capacitor and a first resistor; The first detection end is respectively connected to one end of the first diode, one end of the first capacitor and one end of the first resistor; The first power input terminal is connected to the other end of the first diode, the other end of the first resistor is connected to the first wiring terminal, and the other end of the first capacitor is grounded.

6. The air compressor detection circuit according to claim 4, characterized in that: The second protection circuit includes a second resistor, a third resistor, a second capacitor, a fourth resistor and a second diode; The second wiring terminal is respectively connected to the second resistor, the third resistor and one end of the second capacitor; The other end of the third resistor is connected to one end of the fourth resistor and the second diode respectively; The other ends of the second resistor, the fourth resistor, the second capacitor and the second diode are grounded.

7. The air compressor detection circuit according to any one of claims 3 to 6, characterized in that: It also includes a state detection circuit, which is provided with a first optical coupler and a state detection sensor; the main control chip is provided with a state input terminal; The first optocoupler input terminal is connected to the state detection sensor, and the first optocoupler output terminal is connected to the state input terminal.

8. The air compressor detection circuit according to any one of claims 3 to 6, characterized in that: It also includes a switch control circuit, wherein the switch control circuit is provided with a control switch, a switch chip and a second optical coupler; the main control chip is provided with a switch control terminal; The switch control end is connected to the input end of the second optocoupler, the output end of the second optocoupler is connected to the input end of the switch chip, and the output end of the switch chip is connected to the control switch.

9. The air compressor detection circuit according to any one of claims 3 to 6, characterized in that: It also includes a power supply voltage drop circuit, wherein the power supply voltage drop circuit is provided with a first voltage drop chip, a second voltage drop chip, and a second power supply output terminal; The input end of the first voltage drop chip is connected to an external power supply, the output end of the first voltage drop chip is connected to the input end of the second voltage drop chip, and the second voltage drop chip is provided with a second power supply output end and outputs power to the outside through the second power supply output end.

10. A train, characterized in that: It comprises an air compressor detection circuit as described in any one of claims 1-9.

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