Rail transit vehicle electric whistle control system

Abstract

This invention discloses a control system for an electric horn of a rail transit vehicle, belonging to the field of train horns. It includes a controller and an electric horn, which are communicatively connected. The controller contains an input filtering module, the output of which is connected to the input of a DC / DC power supply module. The output of the DC / DC power supply module is connected to a first power amplifier module and a second power amplifier module. The first power amplifier module is connected to the first electric horn via terminals P1 and P2 of a second connector, and the second power amplifier module is connected to the second electric horn via terminals P3 and P4 of the second connector. A first CPU and a second CPU are communicatively connected, the first power amplifier module is connected to the first CPU, and the second power amplifier module is connected to the second CPU. An I / O module is also communicatively connected to the second CPU within a second motherboard. This invention integrates two independent electric horn power amplifier outputs. It features overvoltage, short-circuit, and overtemperature protection functions, meeting the different sound pressure level requirements of the electric horn during daytime and nighttime. Timely fault feedback ensures safety.

Description

Technical Field

[0001] This invention relates to the field of train whistles, specifically a control system for train whistles in rail transit vehicles. Background Technology

[0002] An electric whistle is an electrically driven audio device used for communication and alarm purposes on locomotives, railcars, and high-speed trains. It is an effective and environmentally friendly electroacoustic transducer used by rail transit vehicles to limit whistling in urban areas. Like cars, train whistles serve as reminders and warnings, essentially to prevent traffic accidents. In train operation management, train drivers must maintain constant communication with station staff and other relevant personnel to ensure train safety. Whistles must be sounded when a train starts, enters or leaves a station, crosses curves, bridges, tunnels, or in adverse weather conditions, or in other situations that may endanger personal safety. Whistle markers are generally placed ahead of level crossings, bridges, tunnels, and locations with poor visibility; train drivers must sound a long whistle upon seeing these markers to reinforce the warning.

[0003] The existing electric horn cannot effectively switch between day and night modes to meet the different sound pressure level requirements during the day and night; the electric horn does not have a fault feedback signal, which affects its safe use. Summary of the Invention

[0004] To address some existing problems, the present invention aims to provide a control system for electric horns of rail transit vehicles, thereby solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A control system for an electric horn of a rail transit vehicle includes a controller and an electric horn, the controller and the electric horn being communicatively connected. The electric horn is provided in two sets, including a first electric horn and a second electric horn. The controller is generally installed in a low-voltage electrical cabinet inside the vehicle.

[0007] The controller is equipped with an input filtering module. The input end of the input filtering module is connected to the DC+ positive terminal and DC- negative terminal of the vehicle body input power supply through the P1 and P2 terminals of the first connector.

[0008] The output terminal of the input filtering module is connected to the input terminal of the DC / DC power supply module. The controller contains a first main board and a second main board. The first main board contains a first power amplifier module, and the second main board contains a second power amplifier module. The output terminal of the DC / DC power supply module is electrically connected to the first power amplifier module and the second power amplifier module, respectively. The first power amplifier module is connected to the first horn through the P1 and P2 terminals of the second connector, and the second power amplifier module is connected to the second horn through the P3 and P4 terminals of the second connector. The first and second horns are connected to the shielding mesh and grounded through the P5 terminal of the second connector.

[0009] The first motherboard contains a first CPU, and the second motherboard contains a second CPU. The first CPU and the second CPU are communicatively connected. The first power amplifier module is connected to the first CPU via an RST three-phase line, and the second power amplifier module is connected to the second CPU via an RST three-phase line. Both the first motherboard and the second motherboard contain a fault detection unit and a voice module. The fault detection unit in the first motherboard is connected to the input terminal of the first CPU, and the voice module in the first motherboard is communicatively connected to both the first CPU and the first power amplifier module. The fault detection unit in the second motherboard is connected to the input terminal of the second CPU, and the voice module in the second motherboard is communicatively connected to both the second CPU and the second power amplifier module.

[0010] The controller is equipped with an I / O module. The I / O module outputs a fault signal through the P4 terminal of the first connector, inputs a horn signal through the P5 terminal of the first connector, and inputs a day / night mode signal through the P6 terminal of the first connector. The I / O module is communicatively connected to the second CPU in the second motherboard. The I / O module is used to receive external signals and output fault signals. When the CPU receives the corresponding signal, it executes the corresponding horn action.

[0011] The controller has a USB test interface inside, which is connected to the second CPU.

[0012] The voice modules within the first and second motherboards are equipped with USB voice editing interfaces.

[0013] As a further aspect of the present invention: the second CPU of the controller is provided with a protection circuit, which includes a transistor T4. The collector of the transistor T4 is connected to the standby power off pin SD, the emitter of the transistor T4 is connected to the power supply -VSS, the base of the transistor T4 is connected to one end of a capacitor C4, and the other end of the capacitor C4 is connected to the power supply -VSS.

[0014] The base of transistor T4 is connected to one end of resistor R10, the other end of resistor R10 is connected to the OTP signal terminal of I / O module and one end of temperature controller K2, and the other end of temperature controller K2 is connected to analog ground AG.

[0015] The base of transistor T4 is connected to one end of resistor R11, and the other end of resistor R11 is connected to the DCP signal terminal of the I / O module, the collector of transistor T1, and the collector of transistor T2. The base of transistor T1 and the emitter of transistor T2 are both connected to analog ground AG. The emitter of transistor T1 is connected to the base of transistor T2. The emitter of transistor T1 is connected to one end of resistor R1, and the other end of resistor R1 is connected to the horn interface SPK+. The base of transistor T2 is connected to one end of resistor R2, and the other end of resistor R12 is connected to analog ground AG.

[0016] The base of transistor T4 is connected to one end of resistor R12, the other end of resistor R12 is connected to the OVP signal terminal of the I / O module and the positive terminal of diode ZD3, and the negative terminal of diode ZD3 is connected to the power output B+.

[0017] The base of transistor T4 is connected to one end of resistor R13, the other end of resistor R13 is connected to the UVP signal terminal of the I / O module and the collector of transistor T3, the collector of transistor T3 is connected to one end of resistor R3, the other end of resistor R3 is connected to analog ground AG, and the emitter of transistor T3 is connected to power supply -VSS.

[0018] The base of transistor T3 is connected to one end of resistor R9, the other end of resistor R9 is connected to power supply -VSS, the base of transistor T3 is connected to one end of resistor R5, the other end of resistor R5 is connected to the positive terminal of diode ZD1, and the negative terminal of diode ZD1 is connected to power supply output B+.

[0019] As a further aspect of the present invention: the input terminals of the I / O module include an OTP signal terminal, a DCP signal terminal, an OVP signal terminal, and a UVP signal terminal. The OTP signal terminal is used to input an over-temperature signal, and outputs a signal when the temperature is higher than 80°C; the DCP signal terminal is used to input a potential imbalance signal, and outputs a signal when the positive voltages of the two electric horns deviate; the OVP signal terminal is used to input an over-voltage signal, and outputs a signal when the power amplifier input voltage is higher than 70V; the UVP signal terminal is used to input an under-voltage signal, and outputs a signal when the power amplifier input voltage is lower than 56V.

[0020] As a further aspect of the present invention: the input filtering module is grounded.

[0021] As a further aspect of the present invention: the power amplifier module is model IRS2092S, and the CPU adopts an STC32G series microcontroller.

[0022] As a further aspect of the present invention: the electric whistle includes an electric whistle horn, which converts the electrical signal from the power amplifier into a sound signal, and the electric whistle horn includes a sound-producing head and a horn.

[0023] As a further aspect of the present invention: the sound head of the electric horn adopts a dual-drive system, and the magnet of the sound head is made of neodymium iron boron.

[0024] As a further aspect of the present invention: the storage chip of the voice module uses a 25Q64 series FLASH, and the storage chip of the voice module stores sound in mp3 and wav formats.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] This invention outputs two independent DC / DC power supplies and integrates two independent electric horn amplifier outputs. It features output short-circuit protection, output overvoltage and overcurrent protection, and over-temperature protection. It should have overvoltage, short-circuit, and over-temperature protection functions, and uses two sets of switching power supplies to power the two power amplifiers respectively.

[0027] This invention allows for mode adjustment, switching between high and low DC 110V levels supplied by the vehicle to meet the different sound pressure level requirements of the electric horn during daytime and nighttime. This invention can also issue a DC 110V low-level fault feedback signal, facilitating timely checks on the horn's operational status and ensuring its safe use. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an electric horn control system for rail transit vehicles.

[0029] Figure 2 This is a schematic diagram of the protection circuit for the CPU in a rail transit vehicle electric horn control system. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Please see Figure 1-2 A control system for an electric horn of a rail transit vehicle includes a controller and an electric horn, which are communicatively connected. The electric horn is provided in two sets, including a first electric horn and a second electric horn. The controller is generally installed in a low-voltage electrical cabinet inside the vehicle, and the specific location is determined by the assembly plant. Heat dissipation measures should be taken into consideration.

[0033] The controller can adjust the mode by switching between high and low levels of DC110V supplied by the vehicle to meet the different sound pressure levels required for the electric horn during the day (low level) and at night (high level).

[0034] The controller can send a DC 110V low-level fault feedback signal. The panel has a power indicator (green) and a fault indicator (red).

[0035] The controller includes an input filtering module. The input terminals of this module are connected to the DC+ positive and DC- negative terminals of the vehicle's power supply via the P1 and P2 terminals of the first connector. The DC / DC power module has a rated operating voltage of DC110V and operates normally within 70%-125% of its rated voltage. The maximum output power of the power module is 500W. The power module uses a commercially available, mature power supply, providing a stable and durable power source and eliminating the impact of vehicle power fluctuations on product performance. The input filtering module is grounded.

[0036] The output of the input filter module is connected to the input of the DC / DC power supply module. The controller contains a first main board and a second main board. The first main board contains a first power amplifier module, and the second main board contains a second power amplifier module. The output of the DC / DC power supply module is electrically connected to both the first and second power amplifier modules. The first power amplifier module is connected to the first electric horn via terminals P1 and P2 of the second connector, and the second power amplifier module is connected to the second electric horn via terminals P3 and P4 of the second connector. The first and second electric horns are grounded via terminal P5 of the second connector and connected to the shielding mesh. The electric horn control host receives a DC 110V power supply (fluctuation range 77V~137.5V) and outputs one set of DC / DC power supplies, integrating two independent electric horn power amplifier outputs. The controller features output short-circuit protection, output overvoltage and overcurrent protection, and over-temperature protection. The power amplifier module uses a Class D power amplifier with integrated circuit chips, characterized by high efficiency and small size.

[0037] The first motherboard contains a first CPU, and the second motherboard contains a second CPU. The first CPU and the second CPU are communicatively connected. The first power amplifier module is connected to the first CPU via the RST three-phase line, and the second power amplifier module is connected to the second CPU via the RST three-phase line. Both the first and second motherboards contain a fault detection unit and a voice module. The fault detection unit in the first motherboard is connected to the input terminal of the first CPU, and the voice module in the first motherboard is communicatively connected to both the first CPU and the first power amplifier module. The fault detection unit in the second motherboard is connected to the input terminal of the second CPU, and the voice module in the second motherboard is communicatively connected to both the second CPU and the second power amplifier module. The CPU on each motherboard controls a set of electric horns to ensure that they do not interfere with each other, thus guaranteeing safety and facilitating the safe use of the electric horns.

[0038] The power amplifier module is model Infineon IRS2092S. It has a horn disconnection detection function and a maximum output electroacoustic power of 200W. The CPU uses a domestic STC32G series microcontroller, which is a 32-bit 8051 microcontroller.

[0039] The electric whistle system uses a power amplifier to amplify the power before sending it to the whistle horn. The effective output frequency range is 450Hz to 3000Hz. The whistle horn has an impedance of 6 ohms and outputs a combination of 630Hz, 1000Hz, and 1600Hz frequencies. The output power of a single electric whistle is no more than 150W. The DC / DC power supply should have overvoltage, short-circuit, and overtemperature protection functions to power both sets of power amplifiers.

[0040] An electric whistle includes an electric whistle horn, which converts the electrical signal from the power amplifier into a sound signal. It mainly consists of a sound head and a horn.

[0041] Key technical parameters of the electric whistle: Maximum electroacoustic power: 150W; Output sound pressure level at 30m directly in front: 105±3dB(A); Frequency response: 630Hz, 1000Hz, 1600Hz combination; The sound head is a crucial component of the electric whistle and employs a dual-drive system. The sound head magnet uses neodymium iron boron (magnetic performance > AlNiCo > ferrite), and the diaphragm uses a polymer film (lighter than resin films, more rigid than titanium films). The electric whistle sound head uses a high-performance neodymium iron boron magnet with a magnetic induction intensity of 19000 Gauss, resulting in high electroacoustic conversion efficiency. At 150W operation, the sound pressure level at 30m directly in front can reach 108dB(A).

[0042] The controller has an internal I / O module. This module connects to the input fault signal via pin P4 of the first connector, to the input horn signal via pin P5 of the first connector, and to the input day / night mode signal via pin P6 of the first connector. The I / O module also communicates with the second CPU within the second motherboard. This connection facilitates information transfer between the first and second CPUs, enabling subsequent control of the two sets of electric horns, ensuring safety, and simplifying the device's operation. The I / O module receives external signals and outputs fault signals; the CPU executes the corresponding horn-sounding action upon receiving the appropriate signal.

[0043] The controller has a built-in USB test interface, which is connected to the second CPU. By inserting a test signal through the USB test interface, the second CPU and the first CPU can communicate with each other, facilitating the testing of the sound production of the two sets of electric horns, ensuring safety, and making the device easy to use.

[0044] The voice modules within the first and second mainboards are equipped with USB voice editing interfaces. These USB interfaces are used to connect inserted voice commands for controlling the electric horn, facilitating subsequent horn control. The voice modules use chips to store audio in MP3 and WAV formats; the storage chip is a 25Q64 series FLASH. The controller panel's USB debugging interface allows for debugging, volume adjustment, fault and log downloading, and audio source uploading.

[0045] The controller can be expanded to include data monitoring of electric horn blasts and a communication interface to upload data, providing data support for the supervision and management of horn noise pollution prevention and control.

[0046] The controller's CPU has an internal protection circuit, which includes a transistor T4. The collector of transistor T4 is connected to the standby power-off pin SD, the emitter of transistor T4 is connected to the power supply -VSS, the base of transistor T4 is connected to one end of capacitor C4, and the other end of capacitor C4 is connected to the power supply -VSS.

[0047] The base of transistor T4 is connected to one end of resistor R10, the other end of resistor R10 is connected to the OTP signal terminal of the I / O module and one end of temperature controller K2, and the other end of temperature controller K2 is connected to analog ground AG.

[0048] The base of transistor T4 is connected to one end of resistor R11. The other end of resistor R11 is connected to the DCP signal terminal of the I / O module, the collector of transistor T1, and the collector of transistor T2. The base of transistor T1 and the emitter of transistor T2 are both connected to analog ground AG. The emitter of transistor T1 is connected to the base of transistor T2. The emitter of transistor T1 is connected to one end of resistor R1. The other end of resistor R1 is connected to the horn interface SPK+. The base of transistor T2 is connected to one end of resistor R2. The other end of resistor R12 is connected to analog ground AG.

[0049] The base of transistor T4 is connected to one end of resistor R12, the other end of resistor R12 is connected to the OVP signal terminal of the I / O module and the positive terminal of diode ZD3, and the negative terminal of diode ZD3 is connected to the power output B+.

[0050] The base of transistor T4 is connected to one end of resistor R13, the other end of resistor R13 is connected to the UVP signal terminal of the I / O module and the collector of transistor T3, the collector of transistor T3 is connected to one end of resistor R3, the other end of resistor R3 is connected to analog ground AG, and the emitter of transistor T3 is connected to power supply -VSS.

[0051] The base of transistor T3 is connected to one end of resistor R9, the other end of resistor R9 is connected to power supply -VSS, the base of transistor T3 is connected to one end of electronic resistor R5, the other end of electronic resistor R5 is connected to the positive terminal of diode ZD1, and the negative terminal of diode ZD1 is connected to the power supply output B+.

[0052] The input terminals of the I / O module include OTP signal terminals, DCP signal terminals, OVP signal terminals, and UVP signal terminals. When the CPU receives the corresponding signals, it performs protection actions.

[0053] The OTP signal terminal takes an over-temperature signal as input and outputs a signal when the temperature exceeds 80℃ (adjustable).

[0054] The DCP signal terminal takes a potential imbalance signal as input and outputs a signal when the positive voltages of the two electric horns deviate.

[0055] The OVP signal terminal receives an overvoltage signal and outputs a signal when the power amplifier input voltage is higher than 70V (adjustable).

[0056] The UVP signal terminal receives an undervoltage signal. When the power amplifier input voltage is below 56V (adjustable), it outputs a signal.

[0057] When the electric horn is short-circuited, the power amplifier chip pin CSD outputs a high level to the CPU's I / O input.

[0058] Input short circuit protection: A fuse is connected in series with the positive terminal of the power input circuit to blow the circuit.

[0059] After power is connected, the indicator light (green) on the horn control unit panel will remain constantly lit. The horn control unit will sound the horn upon receiving a DC110V high-level command from the vehicle. It will also receive mode signals from the vehicle and switch modes (daytime - DC110V low level, nighttime - DC110V high level). If the horn control unit malfunctions, it will send a DC110V low-level fault feedback signal to the vehicle, and the fault indicator light (red) will remain constantly lit. The main triggering fault types include undervoltage, output DCP, overvoltage, overcurrent, input short circuit, overtemperature, and horn wire breakage.

[0060] The electric whistle system of this invention consists of one electric whistle control host and two electric whistle horns.

[0061] The electric whistle control unit takes a DC 110V power input (fluctuation range 77V~137.5V) and outputs a DC / DC power supply. It integrates two independent electric whistle amplifier outputs. It features output short-circuit protection, output overvoltage and overcurrent protection, and over-temperature protection.

[0062] The electric horn outputs a combination of frequencies of 630Hz, 1000Hz, and 1600Hz, with an output power of no more than 150W.

[0063] The controller can adjust the mode by switching between high and low levels of DC110V supplied by the vehicle to meet the different sound pressure levels required for the electric horn during the day (low level) and at night (high level).

[0064] The controller can send a DC 110V low-level fault feedback signal. The panel has a power indicator (green) and a fault indicator (red).

[0065] The controller panel includes a USB debugging interface, which can be used for debugging, volume adjustment, fault and log downloading, and audio source uploading.

[0066] The controller is internally divided into an input module and an output module, which can be disassembled and replaced separately. The input module includes a filter and a DC / DC power supply, while the output module is an electric horn amplifier module.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects; the scope of the invention is defined by the appended claims rather than the foregoing description; and therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0068] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution; this narrative style is merely for clarity; those skilled in the art should consider the specification as a whole; the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A control system for an electric horn of a rail transit vehicle, characterized in that, It includes a controller and an electric horn, which are communicatively connected. The electric horn is provided in two sets, including a first electric horn and a second electric horn. The controller is generally installed in a low-voltage electrical cabinet inside the vehicle. The controller is equipped with an input filtering module. The input end of the input filtering module is connected to the DC+ positive terminal and DC- negative terminal of the vehicle body input power supply through the P1 and P2 terminals of the first connector. The output terminal of the input filtering module is connected to the input terminal of the DC / DC power supply module. The controller contains a first main board and a second main board. The first main board contains a first power amplifier module, and the second main board contains a second power amplifier module. The output terminal of the DC / DC power supply module is electrically connected to the first power amplifier module and the second power amplifier module, respectively. The first power amplifier module is connected to the first horn through the P1 and P2 terminals of the second connector, and the second power amplifier module is connected to the second horn through the P3 and P4 terminals of the second connector. The first and second horns are connected to the shielding mesh and grounded through the P5 terminal of the second connector. The first motherboard contains a first CPU, and the second motherboard contains a second CPU. The first CPU and the second CPU are communicatively connected. The first power amplifier module is connected to the first CPU via an RST three-phase line, and the second power amplifier module is connected to the second CPU via an RST three-phase line. Both the first motherboard and the second motherboard contain a fault detection unit and a voice module. The fault detection unit in the first motherboard is connected to the input terminal of the first CPU, and the voice module in the first motherboard is communicatively connected to both the first CPU and the first power amplifier module. The fault detection unit in the second motherboard is connected to the input terminal of the second CPU, and the voice module in the second motherboard is communicatively connected to both the second CPU and the second power amplifier module. The controller is equipped with an I / O module. The I / O module outputs a fault signal through the P4 terminal of the first connector, inputs a horn signal through the P5 terminal of the first connector, and inputs a day / night mode signal through the P6 terminal of the first connector. The I / O module is connected to the second CPU in the second motherboard. The I / O module is used to receive external signals and output fault signals. When the CPU receives the corresponding signal, it will execute the corresponding horn action. The controller has a built-in USB test interface, which is electrically connected to the second CPU. The voice modules within the first and second motherboards are equipped with USB voice editing interfaces.

2. The rail transit vehicle horn control system according to claim 1, characterized in that, The second CPU of the controller is equipped with a protection circuit, which includes a transistor T4. The collector of transistor T4 is connected to the standby power-off pin SD, the emitter of transistor T4 is connected to the power supply -VSS, the base of transistor T4 is connected to one end of capacitor C4, and the other end of capacitor C4 is connected to the power supply -VSS. The base of transistor T4 is connected to one end of resistor R10, the other end of resistor R10 is connected to the OTP signal terminal of I / O module and one end of temperature controller K2, and the other end of temperature controller K2 is connected to analog ground AG. The base of transistor T4 is connected to one end of resistor R11, and the other end of resistor R11 is connected to the DCP signal terminal of the I / O module, the collector of transistor T1, and the collector of transistor T2. The base of transistor T1 and the emitter of transistor T2 are both connected to analog ground AG. The emitter of transistor T1 is connected to the base of transistor T2. The emitter of transistor T1 is connected to one end of resistor R1, and the other end of resistor R1 is connected to the horn interface SPK+. The base of transistor T2 is connected to one end of resistor R2, and the other end of resistor R12 is connected to analog ground AG. The base of transistor T4 is connected to one end of resistor R12, the other end of resistor R12 is connected to the OVP signal terminal of the I / O module and the positive terminal of diode ZD3, and the negative terminal of diode ZD3 is connected to the power output B+. The base of transistor T4 is connected to one end of resistor R13, the other end of resistor R13 is connected to the UVP signal terminal of the I / O module and the collector of transistor T3, the collector of transistor T3 is connected to one end of resistor R3, the other end of resistor R3 is connected to analog ground AG, and the emitter of transistor T3 is connected to power supply -VSS. The base of transistor T3 is connected to one end of resistor R9, the other end of resistor R9 is connected to power supply -VSS, the base of transistor T3 is connected to one end of resistor R5, the other end of resistor R5 is connected to the positive terminal of diode ZD1, and the negative terminal of diode ZD1 is connected to power supply output B+.

3. A rail transit vehicle horn control system according to claim 2, characterized in that, The I / O module's input terminals include an OTP signal terminal, a DCP signal terminal, an OVP signal terminal, and a UVP signal terminal. The OTP signal terminal is used to input an over-temperature signal, and outputs a signal when the temperature is higher than 80°C. The DCP signal terminal is used to input a potential imbalance signal, and outputs a signal when the positive voltages of the two electric horns deviate. The OVP signal terminal is used to input an over-voltage signal, and outputs a signal when the power amplifier input voltage is higher than 70V. The UVP signal terminal is used to input an under-voltage signal, and outputs a signal when the power amplifier input voltage is lower than 56V.

4. A rail transit vehicle horn control system according to claim 3, characterized in that, The input filtering module is grounded.

5. A rail transit vehicle horn control system according to claim 4, characterized in that, The power amplifier module is model IRS2092S, and the CPU uses an STC32G series microcontroller.

6. A rail transit vehicle horn control system according to claim 5, characterized in that, The electric whistle includes an electric whistle horn, which converts the electrical signal from the power amplifier into a sound signal. The electric whistle horn includes a sound-producing head and a horn.

7. A rail transit vehicle horn control system according to claim 6, characterized in that, The electric horn uses a dual-drive system for its sound head, and the magnet of the sound head is made of neodymium iron boron.

8. A rail transit vehicle horn control system according to claim 7, characterized in that, The storage chip of the voice module uses the 25Q64 series FLASH, and the voice module's storage chip stores audio in mp3 and wav formats.

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