Multi-channel current and voltage composite signal type speed sensor

Abstract

The invention discloses a multi-channel current and voltage composite signal type speed sensor, which relates to the technical field of speed sensors and comprises a sensor detection unit, a signal conversion unit, a traction connector unit and a brake connector unit. Current type signals and voltage type signals are independently output to a train braking system and a train traction system at the same time, accurate transmission of key rotating speed signals is ensured through the sensor, reliable data support is provided for a traction control unit and the braking system, and by the adoption of the miniaturized design, the high-strength metal shell and the electromagnetic shielding technology, the reliability is high. The anti-electromagnetic interference capability of the sensor is enhanced, the stable transmission of signals in a complex environment is ensured, the integrated design and the maintenance-free characteristic of the sensor are realized, the maintenance cost and the workload are reduced, and the operation efficiency of a train is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of speed sensors, in particular to a multi-channel current and voltage composite signal type speed sensor. Background Art

[0002] In the existing rail transit vehicle speed sensor design, there are usually several significant limitations, which directly affect the safety and reliability of train operation. First, most traditional speed sensors can only output current signals or voltage signals separately, and cannot simultaneously meet the train traction system and braking system's demand for diversified signals. This leads to information isolation between systems, increases the complexity and cost of signal processing, and reduces the real-time and accuracy of system response.

[0003] Secondly, traditional speed sensors are easily interfered by external electromagnetic signals during signal transmission, especially in the complex and changeable rail transit environment. There are many electromagnetic noise and interference sources, which seriously affect the purity and stability of signal transmission. This unstable signal transmission may not only lead to misjudgment of the train control system, but also cause safety accidents.

[0004] In addition, traditional speed sensors often lack sufficient flexibility and scalability in design, making it difficult to meet the growing demand for intelligence and integration of rail transit vehicles. At the same time, some sensors have complex structures and difficult maintenance, which increases operating costs and reduces the economy of the overall system.

[0005] In summary, the existing rail transit vehicle speed sensors have obvious deficiencies in signal diversity, anti-interference ability, flexibility and maintainability. These problems need to be solved urgently to ensure the safety and reliability of train operation. Summary of the invention

[0006] The purpose of the present invention is to make up for the shortcomings of the prior art and provide a multi-channel current and voltage composite signal speed sensor. By independently outputting current signals and voltage signals to the train braking and traction systems at the same time, the sensor ensures the accurate transmission of key speed signals and provides reliable data support for the traction control unit and the braking system. The miniaturized design, high-strength metal shell and electromagnetic shielding technology adopted by the present invention not only enhance the sensor's anti-electromagnetic interference capability, but also ensure the stable transmission of signals in complex environments. The integrated design and maintenance-free characteristics of the sensor reduce maintenance costs and workload, and further improve the operating efficiency of the train. In addition, the completely non-contact measurement method extends the service life of the sensor, reduces the failure rate, and provides a solid technical guarantee for the safe and efficient operation of rail transit vehicles.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: A multi-channel current and voltage composite signal type speed sensor, the sensor comprising a sensor detection unit, a signal conversion unit, a traction connector unit and a brake connector unit; The sensor detection unit independently outputs a current signal and a voltage signal at the same time, the current signal is transmitted to the train braking system, and the voltage signal is transmitted to the traction control unit of the train traction system; The signal conversion unit is responsible for receiving the voltage and current signals from the sensor detection unit and performing further conversion and enhancement; The traction connector unit adopts an integrated design, consisting of an intermediate conversion piece and a circular connector plug, wherein the circular connector plug has built-in high-quality contacts, and the contacts are closely connected to the circuit board of the signal conversion unit through precise wires; The brake connector unit adopts an integrated design concept, and is composed of a brake cable, a shielded cable connector and a rectangular connector. The rectangular connector has built-in reliable contacts, which are tightly connected to the core wire of the brake cable by cold crimping.

[0008] Furthermore, the sensor detection unit is further refined to include a sensor detection probe and a sensor probe cable, and the sensor detection probe is specifically composed of the following key elements: Sensing chip: There are two types, namely voltage-type Hall sensing chip and current-type Hall sensing chip, which are installed at the front end of the signal processing circuit board to ensure the sensitivity and efficiency of signal acquisition; Signal processing circuit board: As the core processing component, this circuit board carries the above-mentioned sensing chip and is responsible for the initial processing of the signal. It is encapsulated in a metal shell as a whole, which not only protects the stability and safety of the internal circuit, but also ensures the purity and integrity of the signal; Metal shell: Made of high-strength, corrosion-resistant metal material, it provides a solid protective barrier for internal components and effectively resists interference and damage from the external environment; The sensor probe cable is used to connect the sensor probe with the subsequent signal conversion unit. Its core wire is welded to the tail of the signal processing circuit board to ensure lossless transmission of the signal. This cable is designed specifically for the signal transmission of this sensor, taking into account both signal integrity and transmission stability.

[0009] Furthermore, the voltage-type sensing chip in the sensing chip can output two voltage-type signals, and the current-type sensing chip in the sensing chip can output one current-type signal. The two voltage-type signals and one current-type signal are both transmitted to the signal conversion unit via a dedicated cable for conversion.

[0010] Furthermore, the signal conversion unit includes a probe cable locking piece, a brake cable locking piece and a signal conversion module. The signal conversion module is composed of a signal conversion circuit board and a metal shell. The signal conversion circuit board is encapsulated in the metal shell and is used to power the chip, convert the input 2-way signal, and convert it into 4-way signal output.

[0011] Furthermore, the traction connector unit is a key component in the sensor, which realizes signal transmission with the train traction system. The unit consists of two core parts: an intermediate conversion piece and a circular connector plug; Intermediate conversion piece: The intermediate conversion piece is used to support and stabilize the circular connector plug, while ensuring smooth transmission of internal electrical signals; Circular connector plug: This plug has built-in high-quality contacts, which are directly connected to the circuit board of the signal conversion unit through precision wires. This design ensures fast and accurate signal transmission, and the circular connector plug can achieve a fully sealed plug-in connection with the socket of the train traction system, effectively preventing interference from the external environment and the intrusion of impurities such as moisture and dust. After the connection is successful, the unit can transmit the 4-way signal processed by the signal conversion unit from the sensor detection unit to the train traction system, providing key data support for the train's traction control.

[0012] Furthermore, the brake connector unit is a key connection part between the sensor and the train brake system, and the unit is composed of the following core components: Brake cable: Made of high-quality, highly flexible cable material to ensure the stability of signal transmission in complex motion environments. The core wire inside the cable is responsible for carrying the current signal from the sensor detection unit. Shielded cable connector: This connector is not only used to fix the brake cable, but also integrates electromagnetic shielding technology. Through the shielding design, it isolates the interference of external electromagnetic signals on the transmission signal, thereby improving the purity of signal transmission; Rectangular connector: As the key interface between the brake cable and the brake system, the rectangular connector has built-in high-quality contacts. These contacts are tightly connected to the core wires of the brake cable through cold crimping, realizing lossless transmission of signals. At the same time, the design of the rectangular connector ensures the convenience of plugging and unplugging and the sealing performance, ensuring a good connection state in harsh environments.

[0013] Furthermore, the sensor adopts a miniaturized design, with voltage-type and current-type sensing chips integrated and packaged in a unified probe. The entire machine is shielded with shielding materials, and the circuit has a built-in EMC protection module, which has excellent anti-electromagnetic interference capabilities. The whole machine is integrated into an integrated design, requires no maintenance, and is completely non-contact measurement with an ultra-long life.

[0014] Furthermore, the sensor is particularly suitable for rail transit vehicles, providing the traction system and the braking system with a speed signal that matches the system requirements, thereby ensuring the safety and reliability of the train operation.

[0015] Compared with the prior art, this multi-channel current and voltage composite signal type speed sensor has the following beneficial effects: 1. The present invention realizes comprehensive monitoring of the train operation status by independently outputting current-type signals and voltage-type signals simultaneously and transmitting them to the traction control units of the train braking system and traction system respectively. The sensor adopts a miniaturized design and integrates voltage-type and current-type sensing chips. The accuracy and stability of signal transmission are ensured through precise signal processing and conversion. This composite signal output method enables the train traction system and braking system to obtain accurate speed signals in real time, thereby responding quickly according to the signals and improving the safety and reliability of train operation.

[0016] 2. The present invention fully considers the problem of electromagnetic interference during design. The whole machine is shielded by shielding materials, and the circuit has a built-in EMC protection module. This design enables the sensor to maintain the purity and integrity of the signal in a complex electromagnetic environment, avoiding the interference of external electromagnetic signals on the transmission signal. At the same time, the high-quality contacts, cables and shielding design in the sensor detection unit and the connector unit further enhance the overall anti-electromagnetic interference capability, ensuring the stability and reliability of signal transmission.

[0017] 3. The present invention adopts an integrated design with a compact, durable overall structure. The voltage-type and current-type sensing chips are integrated and packaged in a unified probe, and the signal processing circuit board is packaged in a metal shell, which not only protects the stability and safety of the internal circuit, but also ensures the purity and integrity of the signal. In addition, the sensor does not require maintenance and has an ultra-long life, which reduces operating costs and maintenance difficulties. The completely non-contact measurement method also avoids the wear and tear problems that may exist in traditional sensors, further extending the service life of the sensor.

[0018] Other advantages, objectives and features of the present invention will be set forth in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a structural diagram of a multi-channel current and voltage composite signal type speed sensor; Figure 2 The circuit diagram of a multi-channel current and voltage composite signal type speed sensor.

[0021] Figure 1 In: 10, sensor detection unit; 101, sensor detection probe; 102, sensor probe cable; 20, signal conversion unit; 201, probe cable locking piece; 202, brake cable locking piece; 203, signal conversion module; 30, traction connector unit; 301, intermediate conversion piece; 302, circular connector plug; 40, brake connector unit; 401, rectangular connector; 402, cable connector; 403, brake cable. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] A multi-channel current and voltage composite signal type speed sensor, the sensor comprises a sensor detection unit 10, a signal conversion unit 20, a traction connector unit 30 and a brake connector unit 40; The sensor detection unit 10 independently outputs a current signal and a voltage signal at the same time, the current signal is transmitted to the train braking system, and the voltage signal is transmitted to the traction control unit of the train traction system; The signal conversion unit 20 is responsible for receiving the voltage and current signals from the sensor detection unit 10 and performing further conversion and enhancement; The traction connector unit 30 adopts an integrated design, and is composed of an intermediate conversion piece 301 and a circular connector plug 302, wherein the circular connector plug 302 has a built-in high-quality contact piece, and the contact piece is closely connected to the circuit board of the signal conversion unit through a precision wire; The brake connector unit 40 adopts an integrated design concept, and is composed of a rectangular connector 401, a cable connector 402 and a brake cable 403. The rectangular connector 401 has built-in reliable contacts, which are tightly connected to the core wire of the brake cable 403 by cold crimping. Example

[0024] This embodiment describes in detail the design, component integration and workflow of a multi-channel current and voltage composite signal speed sensor to meet the precise requirements of the traction system and braking system of rail transit vehicles for speed signals and ensure the safety and reliability of train operation.

[0025] Sensor Design and Component Integration: (1) Design and integration of sensor detection unit 10: Design and install voltage-type sensing chip and current-type sensing chip on the signal processing circuit board. The voltage-type sensing chip outputs two 12V voltage signals, and the current-type sensing chip outputs one 7 / 14mA current signal. The signal processing circuit board measures 50mmx11mm and is encapsulated in a stainless steel metal housing with a thickness of 1.6mm, providing good protection and shielding effects; A signal cable with a length of 1.5 meters is welded to the tail of the signal processing circuit board as the sensor probe cable 102; (2) Design and integration of signal conversion unit 20: Design and install a probe cable locking member 201 to secure the sensor probe cable 102; A brake cable locking member 202 is reserved for possible future expansion or backup connection; The signal conversion circuit board is encapsulated in an aluminum alloy shell with a diameter of 42mm. It supplies +12V power to the voltage-type sensing chip, performs signal conversion, and outputs 4 frequency signals from 0Hz to 10kHz. (3) Design and integration of traction connector unit 30: Design and install an intermediate conversion piece 301 made of high-strength metal material with a diameter of 54 mm to support the circular connector plug 302; The circular connector plug 302 has a diameter of 60 mm and has built-in high-quality copper contacts, and is directly connected to the circuit board of the signal conversion unit 20 through precision wires; The plug and the train traction system socket realize fully sealed plug-in connection to ensure the sealing and stability of signal transmission; (4) Design and integration of the brake connector unit 40: A high-quality, highly flexible insulated cable with a length of 0.5 m is selected as the brake cable 403; The cable connector 402 with integrated electromagnetic shielding technology has a diameter of 26.5 mm and isolates it from external electromagnetic signal interference; The rectangular connector 401 is designed with a size of 54.6mmx45.4mmx32.4mm, and has a built-in high-quality copper contact. It is tightly connected to the core wire of the brake cable 403 by cold crimping to ensure lossless transmission of the signal.

[0026] Workflow: (1) Signal detection: The sensing chip of the sensor detection unit 10 starts working, the voltage-type sensing chip outputs two voltage signals, and the current-type sensing chip outputs one current signal; (2) Preliminary signal processing and transmission: The signal processing circuit board performs preliminary processing on the signal output by the sensing chip and transmits the signal to the signal conversion unit 20 through the sensor probe cable 102; (3) Signal conversion: The signal conversion circuit board converts the received voltage signal to generate 4-way signals, and transmits the signals to the traction connector unit 30 through internal connections; (4) Signal transmission to traction and braking systems: The circular connector plug 302 is connected to the train traction system socket to transmit the frequency signal to the traction system, and the brake cable 403 and the rectangular connector 401 transmit the current signal to the braking system; (5) System response: The traction system and braking system perform corresponding operations based on the received signals to ensure the safety and reliability of train operation.

[0027] This embodiment realizes accurate detection and transmission of multi-channel current and voltage composite signals through carefully designed sensor detection units, signal conversion units, traction connector units and brake connector units, providing reliable technical support for the traction and braking systems of rail transit vehicles. The whole machine adopts a miniaturized design, has excellent anti-electromagnetic interference capabilities, requires no maintenance, is completely non-contact measurement, and has an ultra-long life.

[0028] It will be apparent to those skilled in the art that the 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 the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A multi-channel current and voltage composite signal type speed sensor, characterized in that: The sensor comprises a sensor detection unit (10), a signal conversion unit (20), a traction connector unit (30) and a brake connector unit (40); The sensor detection unit (10) independently outputs a current type signal and a voltage type signal simultaneously, the current type signal is transmitted to the train braking system, and the voltage type signal is transmitted to the traction control unit of the train traction system; The signal conversion unit (20) is responsible for receiving the voltage and current signals from the sensor detection unit (10), and performing further conversion and enhancement; The traction connector unit (30) adopts an integrated design and is composed of an intermediate conversion piece (301) and a circular connector plug (302), wherein the circular connector plug (302) has a built-in high-quality contact piece, and the contact piece is closely connected to the circuit board of the signal conversion unit through a precision wire; The brake connector unit (40) adopts an integrated design concept and is composed of a rectangular connector (401), a cable connector (402) and a brake cable (403). The rectangular connector (401) has a built-in reliable contact piece and is tightly connected to the core wire of the brake cable (403) by cold crimping.

2. A multi-channel current and voltage composite signal type speed sensor according to claim 1, characterized in that: The sensor detection unit (10) further comprises a sensor detection probe (101) and a sensor probe cable (102), wherein the sensor detection probe (101) is specifically composed of the following key elements: Sensor chip: There are two types, namely voltage type Hall sensor chip and current type Hall sensor chip, which are installed at the front end of the signal processing circuit board; Signal processing circuit board: As the core processing component, this circuit board carries the above-mentioned sensing chip and is responsible for the preliminary processing of the signal. It is encapsulated in a metal shell as a whole; Metal housing: Made of high-strength, corrosion-resistant metal, it provides a solid protective barrier for internal components; The sensor probe cable (102) is used to connect the sensor probe with a subsequent signal conversion unit, and its core wire is welded to the tail of the signal processing circuit board. This cable is designed specifically for signal transmission of the sensor, taking into account both signal integrity and transmission stability.

3. A multi-channel current and voltage composite signal type speed sensor according to claim 2, characterized in that: The voltage-type sensing chip in the sensing chip can output two voltage-type signals, and the current-type sensing chip in the sensing chip can output one current-type signal. The two voltage-type signals and one current-type signal are both transmitted to the signal conversion unit through a dedicated cable for conversion.

4. A multi-channel current and voltage composite signal type speed sensor according to claim 1, characterized in that: The signal conversion unit (20) comprises a probe cable locking piece (201), a brake cable locking piece (202) and a signal conversion module (203); the signal conversion module (203) comprises a signal conversion circuit board and a metal shell; the signal conversion circuit board is encapsulated in the metal shell and is used to supply power to the chip, convert two input signals, and convert them into four output signals.

5. The multi-channel current and voltage composite signal type speed sensor according to claim 1, characterized in that: The traction connector unit (30) is a key component in the sensor, and realizes signal transmission with the train traction system. The unit is composed of two core parts: an intermediate conversion piece (301) and a circular connector plug (302); Intermediate conversion piece (301): The intermediate conversion piece (301) is used to support and stabilize the circular connector plug (302) and ensure smooth transmission of internal electrical signals; Circular connector plug (302): This plug has built-in high-quality contacts, which are directly connected to the circuit board of the signal conversion unit (20) through precision wires. The circular connector plug (302) can achieve a fully sealed plug-in connection with the socket of the train traction system. After the connection is successful, the unit can transmit the four-channel signals of the sensor detection unit (10) processed by the signal conversion unit (20) to the train traction system.

6. A multi-channel current and voltage composite signal type speed sensor according to claim 1, characterized in that: The brake connector unit (40) serves as a key connection part between the sensor and the train brake system. The unit is composed of the following core components: Brake cable (401): made of high-quality, highly flexible cable material, the inner core wire of the cable is responsible for carrying the current signal from the sensor detection unit (10); Shielded cable connector (402): This connector is not only used to fix the brake cable (401), but also integrates electromagnetic shielding technology. Through the shielding design, it isolates the interference of external electromagnetic signals on the transmission signal; Rectangular connector (403): As a key interface between the brake cable (401) and the brake system, the rectangular connector (403) has built-in high-quality contacts. These contacts are tightly connected to the core wires of the brake cable (401) by cold crimping, thereby achieving lossless signal transmission. At the same time, the design of the rectangular connector (403) ensures the convenience of plugging and unplugging and the sealing performance, ensuring that a good connection state can be maintained in harsh environments.

7. A multi-channel current and voltage composite signal type speed sensor according to any one of claims 1 to 6, characterized in that: The sensor adopts a miniaturized design. The voltage-type and current-type sensing chips are integrated and packaged in a unified probe. The whole machine is shielded with shielding materials. The circuit has a built-in EMC protection module and has excellent anti-electromagnetic interference capabilities. The whole machine is integrated and requires no maintenance. It features completely non-contact measurement and has an ultra-long life.

8. A multi-channel current and voltage composite signal type speed sensor according to any one of claims 1 to 7, characterized in that: The sensor is particularly suitable for rail transit vehicles, providing the traction system and the braking system with speed signals that match the system requirements, ensuring the safety and reliability of train operation.

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