Speed ​​pulse signal acquisition device and method for tram signal control system

Abstract

The present invention provides a speed pulse signal acquisition device and method for a tram signal control system, the device comprising: a first branching device, used to convert a speed pulse signal output by the first speed sensor into multiple speed pulse signals, send one speed pulse signal of the multiple speed pulse signals to the vehicle braking system, and send another speed pulse signal to the signal control system; a second branching device, used to convert another speed pulse signal output by the first speed sensor, and send the converted speed pulse signal to the signal control system, so that the signal control system can simulate a speed pulse signal according to the speed pulse signals received from the first branching device and the second branching device. The present invention enables the signal control system and the vehicle braking system to share a speed sensor, and meets the signal control system's demand for the number of speed pulse signals.

Description

Technical Field

[0001] The present invention relates to the field of rail transit technology, and in particular to a speed pulse signal acquisition device and method for a tram signal control system. Background Art

[0002] At present, in the field of subway, the signal control system adopts a photoelectric speed sensor that can provide 3-way speed pulse signal as the speed measurement input to meet its own speed measurement accuracy requirements and speed sensor disconnection detection needs. At the same time, in order to reduce the interference of idling and slipping on the speed sensor and ensure the accuracy of speed measurement, the speed sensor needs to be installed on the non-powered shaft of the vehicle.

[0003] When modern tram systems use subway signal control systems as train operation control systems, they also need to install dedicated speed sensors to measure train displacement and speed, so as to accurately control train operation. Modern low-floor trams have a small installation space under the vehicle and no non-powered axles, which cannot meet the installation requirements of speed sensors dedicated to signal control systems. Summary of the invention

[0004] The present invention provides a speed pulse signal acquisition device and method for a tram signal control system, which are used to solve the defect in the prior art that a tram cannot be equipped with a first speed sensor dedicated to a signal control system, resulting in the signal control system being unable to acquire a required speed signal, and the speed signal output by the first speed sensor of a vehicle traction system is split for use by a vehicle braking system and a signal control system.

[0005] The present invention provides a speed pulse signal acquisition device for a tram signal control system, comprising:

[0006] a first branching device, wherein an input end of the first branching device is used to be connected to a first speed sensor signal of a vehicle traction system of a tram, and an output end of the first branching device is used to be connected to a vehicle brake system signal of the tram, and to a signal control system signal of the tram;

[0007] The first branching device is used to convert a speed pulse signal output by the first speed sensor into multiple speed pulse signals, send one speed pulse signal of the multiple speed pulse signals to the vehicle braking system, and send another speed pulse signal to the signal control system;

[0008] a second branching device, wherein the input end of the second branching device is used to be connected to the first speed sensor signal, and the output end of the second branching device is used to be connected to the signal control system signal;

[0009] The second branch device is used to convert another speed pulse signal output by the first speed sensor, and send the speed pulse signal obtained after the conversion to the signal control system, so that the signal control system can simulate a speed pulse signal based on the speed pulse signals received from the first branch device and the second branch device.

[0010] According to a speed pulse signal acquisition device for a tram signal control system provided by the present invention, the first branching device comprises:

[0011] A differential receiver, the input end of which is connected to the first speed sensor, and the differential receiver is used to receive and process a speed pulse signal output by the first speed sensor;

[0012] Multiple electrical isolation circuits, each of which is connected to the output end of the differential receiver, and each of which is used to electrically isolate the speed pulse signal output by the differential receiver into one speed pulse signal;

[0013] A differential driver, wherein the input end of the differential driver is connected to the output end of an electrical isolation circuit, the output end of the differential driver is connected to the vehicle braking system, and the differential driver is used to process the speed pulse signal output by the electrical isolation circuit and send it to the vehicle braking system;

[0014] A first OC driver, the first OC driver is connected to the output end of another electrical isolation circuit and to the signal control system, and the first OC driver is used to process the speed pulse signal output by the other electrical isolation circuit and send it to the signal control system.

[0015] According to a speed pulse signal acquisition device for a tram signal control system provided by the present invention, the second branching device has the same structure as the first branching device;

[0016] The differential receiver in the second branching device is used to receive and process another speed pulse signal output by the first speed sensor;

[0017] The output end of the differential driver in the second branching device is not connected to the vehicle braking system;

[0018] The output end of the first OC driver in the second branching device is connected to the signal control system.

[0019] According to a speed pulse signal acquisition device for a tram signal control system provided by the present invention, the first branching device further includes:

[0020] The second OC driver is connected to the output end of the other electrical isolation circuit and to other systems of the tram, and the second OC driver is used for processing the speed pulse signal output by the other electrical isolation circuit and sending it to the other system.

[0021] A speed pulse signal acquisition device for a tram signal control system according to the present invention further includes:

[0022] A third branching device, wherein the input end of the third branching device is used to be connected to the second speed sensor signal of the vehicle traction system, and the output end of the third branching device is used to be connected to the vehicle braking system signal and the signal control system signal;

[0023] The third branching device is used to convert one speed pulse signal output by the second speed sensor into multiple speed pulse signals, send one speed pulse signal of the multiple speed pulse signals to the vehicle braking system, and send another speed pulse signal to the signal control system;

[0024] a fourth branching device, wherein the input end of the fourth branching device is used to be connected to the second speed sensor signal, and the output end of the fourth branching device is used to be connected to the signal control system signal;

[0025] The fourth branch device is used to convert another speed pulse signal output by the second speed sensor, and send the speed pulse signal obtained after the conversion to the signal control system, so that the signal control system can simulate a speed pulse signal based on the speed pulse signals received from the third branch device and the fourth branch device when it is determined that the first speed sensor is abnormal.

[0026] The present invention also provides a method for obtaining a speed pulse signal of a tram signal control system, comprising:

[0027] Converting a speed pulse signal outputted by a first speed sensor of a vehicle traction system of a tram into multiple speed pulse signals by a first branching device;

[0028] Sending one speed pulse signal of the multiple speed pulse signals to the vehicle braking system of the tram, and sending another speed pulse signal to the signal control system of the tram;

[0029] Another speed pulse signal output by the first speed sensor is converted by a second branch device, and the speed pulse signal obtained after the conversion is sent to the signal control system so that the signal control system can simulate a speed pulse signal based on the speed pulse signals received from the first branch device and the second branch device.

[0030] According to a method for acquiring a speed pulse signal of a tram signal control system provided by the present invention, the step of converting a speed pulse signal output by a first speed sensor of a vehicle traction system of a tram into multiple speed pulse signals by a first branching device comprises:

[0031] Processing a speed pulse signal output by the first speed sensor through a differential receiver in the first branching device;

[0032] The speed pulse signal output by the differential receiver is electrically isolated into one speed pulse signal through each electrical isolation circuit in the first branching device;

[0033] The speed pulse signal output by one electrical isolation circuit is processed by the differential driver in the first branch device and then sent to the vehicle braking system;

[0034] The speed pulse signal output by another electrical isolation circuit is processed by the first OC driver in the first branching device and then sent to the signal control system.

[0035] A speed pulse signal acquisition method for a tram signal control system provided by the present invention also includes:

[0036] Processing another speed pulse signal output by the first speed sensor through a differential receiver in the second branching device;

[0037] The speed pulse signal output by the differential receiver is electrically isolated into one speed pulse signal through each electrical isolation circuit in the second branching device;

[0038] The speed pulse signal output by one electrical isolation circuit is processed by the first OC driver in the second branching device and then sent to the signal control system.

[0039] A speed pulse signal acquisition method for a tram signal control system provided by the present invention also includes:

[0040] The speed pulse signals output by other electrical isolation circuits are processed by the second OC driver in the first branching device and then sent to other systems of the tram.

[0041] A speed pulse signal acquisition method for a tram signal control system provided by the present invention also includes:

[0042] Converting a speed pulse signal outputted by a second speed sensor of the vehicle traction system into multiple speed pulse signals through a third branching device;

[0043] Sending one speed pulse signal of the multiple speed pulse signals to the vehicle braking system of the tram, and sending another speed pulse signal to the signal control system of the tram;

[0044] Another speed pulse signal output by the second speed sensor is converted by a fourth branch device, and the speed pulse signal obtained after the conversion is sent to the signal control system, so that the signal control system can simulate a speed pulse signal based on the speed pulse signals received from the third branch device and the fourth branch device when it is determined that the first speed sensor is abnormal.

[0045] The speed pulse signal acquisition device and method of the tram signal control system provided by the present invention use two speed pulse signal branching devices to branch two speed pulse signals emitted by the incremental speed sensor used in the traction system into multiple speed pulse signals required by the user end for the vehicle's braking system and signal control system when the dedicated speed sensor of the tram signal control system does not meet the installation conditions. The signal control system simulates a third speed pulse signal based on the two speed pulse signals to meet the signal control system's demand for the number of speed pulse signals, thereby realizing the signal control system and the vehicle's braking system sharing the speed sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 It is a structural schematic diagram of a speed pulse signal acquisition device of a tram signal control system provided by the present invention;

[0048] Figure 2 It is a schematic diagram of a speed pulse signal provided by an incremental speed sensor of a vehicle traction system in a speed pulse signal acquisition device of a tram signal control system provided by the present invention;

[0049] Figure 3It is a structural schematic diagram of a speed pulse signal splitting device in a speed pulse signal acquiring device of a tram signal control system provided by the present invention;

[0050] Figure 4 It is a flow chart of a speed pulse signal acquisition method of a tram signal control system provided by the present invention. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. 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.

[0052] Combine the following Figure 1 The invention discloses a speed pulse signal acquisition device for a tram signal control system, comprising:

[0053] a first branching device, wherein an input end of the first branching device is used to be connected to a first speed sensor signal of a vehicle traction system of a tram, and an output end of the first branching device is used to be connected to a vehicle brake system signal of the tram, and to a signal control system signal of the tram;

[0054] The first branching device is used to convert a speed pulse signal output by the first speed sensor into multiple speed pulse signals, send one speed pulse signal of the multiple speed pulse signals to the vehicle braking system, and send another speed pulse signal to the signal control system;

[0055] Since the installation space under the tram is small and there is no non-powered axle, it is impossible to meet the installation requirements of the dedicated speed sensor of the signal control system. In order to meet the speed measurement requirements of the signal control system, this embodiment considers that the signal control system and the vehicle braking system share the speed pulse signal emitted by the speed sensor.

[0056] like Figure 2 As shown, the vehicle traction system uses an incremental speed sensor, which can output two speed pulse signals, A and B. Among them, the speed pulse signal of channel A is used by the vehicle braking system, and the remaining speed pulse signal of channel B cannot meet the speed measurement requirements of the signal control system.

[0057] The A-path speed pulse signal output by the first speed sensor is branched by the first branching device, and the A-path speed pulse signal is branched into multiple speed pulse signals which are respectively supplied to the vehicle braking system and the signal control system for use.

[0058] Optionally, the first speed sensor is mounted on a traction motor of a traction system of the vehicle.

[0059] a second branching device, wherein the input end of the second branching device is used to be connected to the first speed sensor signal, and the output end of the second branching device is used to be connected to the signal control system signal;

[0060] The second branch device is used to convert another speed pulse signal output by the first speed sensor, and send the speed pulse signal obtained after the conversion to the signal control system, so that the signal control system can simulate a speed pulse signal based on the speed pulse signals received from the first branch device and the second branch device.

[0061] The B-way speed pulse signal output by the first speed sensor is converted into a one-way speed pulse signal required by the signal control system through the first branch device.

[0062] The first speed sensor of the vehicle traction system has only two speed pulse signals, A and B. In order to meet the input requirements of the signal control system for three pulse signals, the signal control system needs to simulate a third speed pulse signal based on one speed pulse signal received from the first branch device and one speed pulse signal received from the second branch device.

[0063] Optionally, the third speed pulse signal simulated by the signal control system is the average of the two speed pulse signals it receives, so as to achieve the same number of speed pulse signal inputs as the photoelectric speed sensor.

[0064] Before simulating the speed pulse signal, the signal control system first determines whether the two received speed pulse signals are normal. If normal, the average of the two received speed pulse signals is taken as the third speed pulse signal, and the state of the first speed sensor is set to valid; otherwise, the A and B speed pulse signals emitted by the first speed sensor are cleared and the state is set to invalid.

[0065] Optionally, the signal control system determines whether the two received speed pulse signals are normal by judging whether the difference in the number of pulses between the two received speed pulse signals is less than a certain threshold.

[0066] In this embodiment, when the dedicated speed sensor of the signal control system of the tram does not meet the installation conditions, two speed pulse signal splitting devices are used to split the two speed pulse signals emitted by the incremental speed sensor used in the traction system into multiple speed pulse signals required by the user end for the vehicle's braking system and signal control system. The signal control system simulates a third speed pulse signal based on the two speed pulse signals to meet the signal control system's requirement for the number of speed pulse signals, thereby realizing the signal control system and the vehicle's braking system sharing the speed sensor.

[0067] Based on the above embodiments, Figure 3 As shown, in this embodiment, the first branching device includes:

[0068] A differential receiver, the input end of which is connected to the first speed sensor, and the differential receiver is used to receive and process a speed pulse signal output by the first speed sensor;

[0069] Figure 3 The part in the rounded rectangle is a schematic diagram of the structure of the first branching device. The differential receiver is connected to the first speed sensor installed on the traction motor to realize the input of the A-way speed pulse signal and convert it into multiple-way speed pulse signals according to requirements.

[0070] Multiple electrical isolation circuits, each of which is connected to the output end of the differential receiver, and each of which is used to electrically isolate the speed pulse signal output by the differential receiver into one speed pulse signal;

[0071] The electrical isolation circuit isolates each speed pulse signal, and a reliable isolation chip can be used to achieve error-free transmission and complete electrical isolation of the speed pulse signal.

[0072] A differential driver, wherein the input end of the differential driver is connected to the output end of an electrical isolation circuit, the output end of the differential driver is connected to the vehicle braking system, and the differential driver is used to process the speed pulse signal output by the electrical isolation circuit and send it to the vehicle braking system;

[0073] A first OC driver, the first OC driver is connected to the output end of another electrical isolation circuit and to the signal control system, and the first OC driver is used to process the speed pulse signal output by the other electrical isolation circuit and send it to the signal control system.

[0074] The driving circuit part of the first branching device is designed to match the needs of the user end. For example, the differential driver corresponding to the vehicle braking system of the tram adopts an RS485 level differential driver, and the signal control system adopts an OC (Open Collector) driver.

[0075] The driving circuit part effectively outputs the electrically isolated speed pulse signal to each output port, thereby realizing the branching and output of the speed pulse signal.

[0076] Optionally, the first branch device further includes an isolated power supply circuit. The isolated power supply circuit stabilizes and converts the input power supply to realize reliable power supply to the speed sensor using the input power supply, and according to the requirements of the first branch device, converts the input power supply into an isolated power supply to realize reliable power supply to the first branch device.

[0077] This embodiment isolates the speed pulse signal output by the differential receiver by using an electrical isolation circuit, thereby avoiding interference between different output interfaces and input interfaces in the event of a fault, and effectively reducing the impact of the fault; at the same time, it meets the signal control system's requirements for the number of speed pulse signal paths of the speed sensor, and improves the reliability and availability of the speed measurement function of the signal control system.

[0078] On the basis of the above embodiment, the structure of the second branching device in this embodiment is the same as that of the first branching device;

[0079] The differential receiver in the second branching device is used to receive and process another speed pulse signal output by the first speed sensor;

[0080] The output end of the differential driver in the second branching device is not connected to the vehicle braking system;

[0081] The output end of the first OC driver in the second branching device is connected to the signal control system.

[0082] like Figure 1 As shown, the second branching device branches the B-way speed pulse signal output by the first speed sensor, and branches the B-way speed pulse signal into multiple speed pulse signals. One speed pulse signal of the multiple speed pulse signals is used by the signal control system, and the multiple speed pulse signals are not used by the vehicle braking system.

[0083] On the basis of the above embodiment, in this embodiment, the first branching device further includes:

[0084] The second OC driver is connected to the output end of the other electrical isolation circuit and to other systems of the tram, and the second OC driver is used for processing the speed pulse signal output by the other electrical isolation circuit and sending it to the other system.

[0085] like Figure 3 As shown, a speed pulse signal outputted from the differential receiver is isolated by a separate electrical isolation circuit, and is provided to other systems of the tram for use through an output interface after level conversion by the second OC driver.

[0086] Figure 3 The reserved drives in the can be set up with different types of drives as needed for use in trams.

[0087] Based on the above embodiments, Figure 1 As shown, this embodiment also includes: a third branch device, the input end of the third branch device is used to connect with the second speed sensor signal of the vehicle traction system, and the output end of the third branch device is used to connect with the vehicle braking system signal and the signal control system signal;

[0088] The third branching device is used to convert one speed pulse signal output by the second speed sensor into multiple speed pulse signals, send one speed pulse signal of the multiple speed pulse signals to the vehicle braking system, and send another speed pulse signal to the signal control system;

[0089] Optionally, the third branch device has the same structure and connection mode as the first branch device, and the fourth branch device has the same structure and connection mode as the second branch device. A second speed sensor is also installed on the traction motor of the vehicle traction system.

[0090] The A-way speed pulse signal output by the second speed sensor is branched by the third branching device, and the A-way speed pulse signal is branched into multiple speed pulse signals which are respectively supplied to the vehicle braking system and the signal control system for use.

[0091] a fourth branching device, wherein the input end of the fourth branching device is used to be connected to the second speed sensor signal, and the output end of the fourth branching device is used to be connected to the signal control system signal;

[0092] The fourth branch device is used to convert another speed pulse signal output by the second speed sensor, and send the speed pulse signal obtained after the conversion to the signal control system, so that the signal control system can simulate a speed pulse signal based on the speed pulse signals received from the third branch device and the fourth branch device when it is determined that the first speed sensor is abnormal.

[0093] The B-way speed pulse signal output by the second speed sensor is converted into a one-way speed pulse signal required by the signal control system through the fourth branching device.

[0094] Optionally, before simulating the speed pulse signal, the first speed sensor is used by default to determine whether the working condition of the first speed sensor is normal. If the working condition of the first speed sensor is normal, a speed pulse signal is simulated according to the speed pulse signals received from the first branch device and the second branch device; otherwise, the second speed sensor is switched to simulate a speed pulse signal according to the speed pulse signals received from the third branch device and the fourth branch device.

[0095] The signal control system determines whether the ratio between the average value of the three signals, namely, the two received speed pulse signals and the simulated speed pulse signal, and the maximum difference between each of the three signals exceeds a preset threshold value. If so, it indicates that the corresponding speed sensor is operating abnormally.

[0096] This embodiment uses two speed sensors to generate speed pulse signals. If one speed sensor is in normal working condition and the other speed sensor is in abnormal working condition, the speed sensor with normal working condition is switched to simulate the signal to measure speed and distance, thereby realizing redundant processing of the two speed sensors and improving the reliability of the speed measurement function.

[0097] The speed pulse signal acquisition method of the tram signal control system provided by the present invention is described below. The speed pulse signal acquisition method of the tram signal control system described below and the speed pulse signal acquisition device of the tram signal control system described above can correspond to each other.

[0098] like Figure 4 As shown, this embodiment provides a method for obtaining a speed pulse signal of a tram signal control system, comprising:

[0099] Step 401, converting a speed pulse signal outputted by a first speed sensor of a vehicle traction system of a tram into multiple speed pulse signals through a first branching device;

[0100] Step 402, sending one speed pulse signal of the multiple speed pulse signals to the vehicle braking system of the tram, and sending another speed pulse signal to the signal control system of the tram;

[0101] Step 403, converting another speed pulse signal output by the first speed sensor through a second branch device, and sending the converted speed pulse signal to the signal control system so that the signal control system can simulate a speed pulse signal based on the speed pulse signals received from the first branch device and the second branch device.

[0102] In this embodiment, when the dedicated speed sensor of the signal control system of the tram does not meet the installation conditions, two speed pulse signal splitting devices are used to split the two speed pulse signals emitted by the incremental speed sensor used in the traction system into multiple speed pulse signals required by the user end for the vehicle's braking system and signal control system. The signal control system simulates a third speed pulse signal based on the two speed pulse signals to meet the signal control system's demand for the number of speed pulse signals, thereby realizing the signal control system and the vehicle's braking system sharing the speed sensor.

[0103] On the basis of the above embodiments, the steps of converting one speed pulse signal output by the first speed sensor of the vehicle traction system of the tram into multiple speed pulse signals through the first branch device in this embodiment include: processing one speed pulse signal output by the first speed sensor through the differential receiver in the first branch device; electrically isolating the speed pulse signal output by the differential receiver into one speed pulse signal through each electrical isolation circuit in the first branch device; processing the speed pulse signal output by one electrical isolation circuit through the differential driver in the first branch device and sending it to the vehicle braking system; processing the speed pulse signal output by another electrical isolation circuit through the first OC driver in the first branch device and sending it to the signal control system.

[0104] Based on the above embodiment, this embodiment also includes: processing another speed pulse signal output by the first speed sensor through the differential receiver in the second branch device; electrically isolating the speed pulse signal output by the differential receiver into one speed pulse signal through each electrical isolation circuit in the second branch device; processing the speed pulse signal output by one electrical isolation circuit through the first OC driver in the second branch device and sending it to the signal control system.

[0105] On the basis of the above embodiment, this embodiment also includes: processing the speed pulse signals output by other electrical isolation circuits through the second OC driver in the first branching device and sending the processed signals to other systems of the tram.

[0106] On the basis of the above embodiments, the present embodiment also includes: converting a speed pulse signal output by the second speed sensor of the vehicle traction system into multiple speed pulse signals through a third branch device; sending one speed pulse signal of the multiple speed pulse signals to the vehicle braking system of the tram, and sending another speed pulse signal to the signal control system of the tram; converting another speed pulse signal output by the second speed sensor through a fourth branch device, and sending the converted speed pulse signal to the signal control system, so that the signal control system can generate a speed pulse signal based on the speed pulse signals received from the third branch device and the fourth branch device when determining that the first speed sensor is abnormal.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A speed pulse signal acquisition device for a tram signal control system, characterized in that: include: a first branching device, wherein an input end of the first branching device is used to be connected to a first speed sensor signal of a vehicle traction system of a tram, and an output end of the first branching device is used to be connected to a vehicle brake system signal of the tram, and to a signal control system signal of the tram; The first branching device is used to convert a speed pulse signal output by the first speed sensor into multiple speed pulse signals, send one speed pulse signal of the multiple speed pulse signals to the vehicle braking system, and send another speed pulse signal to the signal control system; a second branching device, wherein the input end of the second branching device is used to be connected to the first speed sensor signal, and the output end of the second branching device is used to be connected to the signal control system signal; The second branch device is used to convert another speed pulse signal output by the first speed sensor, and send the speed pulse signal obtained after the conversion to the signal control system, so that the signal control system can simulate a speed pulse signal based on the speed pulse signals received from the first branch device and the second branch device.

2. The speed pulse signal acquisition device for a tram signal control system according to claim 1, characterized in that: The first branching device comprises: A differential receiver, the input end of which is connected to the first speed sensor, and the differential receiver is used to receive and process a speed pulse signal output by the first speed sensor; Multiple electrical isolation circuits, each of which is connected to the output end of the differential receiver, and each of which is used to electrically isolate the speed pulse signal output by the differential receiver into one speed pulse signal; A differential driver, wherein the input end of the differential driver is connected to the output end of an electrical isolation circuit, the output end of the differential driver is connected to the vehicle braking system, and the differential driver is used to process the speed pulse signal output by the electrical isolation circuit and send it to the vehicle braking system; A first OC driver, the first OC driver is connected to the output end of another electrical isolation circuit and to the signal control system, and the first OC driver is used to process the speed pulse signal output by the other electrical isolation circuit and send it to the signal control system.

3. The speed pulse signal acquisition device for a tram signal control system according to claim 2, characterized in that: The second branching device has the same structure as the first branching device; The differential receiver in the second branching device is used to receive and process another speed pulse signal output by the first speed sensor; The output end of the differential driver in the second branching device is not connected to the vehicle braking system; The output end of the first OC driver in the second branching device is connected to the signal control system.

4. The speed pulse signal acquisition device for a tram signal control system according to claim 2, characterized in that: The first branching device also includes: The second OC driver is connected to the output end of the other electrical isolation circuit and to other systems of the tram, and the second OC driver is used for processing the speed pulse signal output by the other electrical isolation circuit and sending it to the other system.

5. The speed pulse signal acquisition device for a tram signal control system according to any one of claims 1 to 4, characterized in that: Also includes: A third branching device, wherein the input end of the third branching device is used to be connected to the second speed sensor signal of the vehicle traction system, and the output end of the third branching device is used to be connected to the vehicle braking system signal and the signal control system signal; The third branching device is used to convert one speed pulse signal output by the second speed sensor into multiple speed pulse signals, send one speed pulse signal of the multiple speed pulse signals to the vehicle braking system, and send another speed pulse signal to the signal control system; a fourth branching device, wherein the input end of the fourth branching device is used to be connected to the second speed sensor signal, and the output end of the fourth branching device is used to be connected to the signal control system signal; The fourth branch device is used to convert another speed pulse signal output by the second speed sensor, and send the speed pulse signal obtained after the conversion to the signal control system, so that the signal control system can simulate a speed pulse signal based on the speed pulse signals received from the third branch device and the fourth branch device when it is determined that the first speed sensor is abnormal.

6. A method for acquiring a speed pulse signal of a tram signal control system, characterized in that: include: Converting a speed pulse signal outputted by a first speed sensor of a vehicle traction system of a tram into multiple speed pulse signals by a first branching device; Sending one speed pulse signal of the multiple speed pulse signals to the vehicle braking system of the tram, and sending another speed pulse signal to the signal control system of the tram; Another speed pulse signal output by the first speed sensor is converted by a second branch device, and the speed pulse signal obtained after the conversion is sent to the signal control system so that the signal control system can simulate a speed pulse signal based on the speed pulse signals received from the first branch device and the second branch device.

7. The method for acquiring speed pulse signals of a tram signal control system according to claim 6, characterized in that: The step of converting a speed pulse signal outputted by a first speed sensor of a vehicle traction system of a tram into multiple speed pulse signals by means of a first branching device comprises: Processing a speed pulse signal output by the first speed sensor through a differential receiver in the first branching device; The speed pulse signal output by the differential receiver is electrically isolated into one speed pulse signal through each electrical isolation circuit in the first branching device; The speed pulse signal output by one electrical isolation circuit is processed by the differential driver in the first branch device and then sent to the vehicle braking system; The speed pulse signal output by another electrical isolation circuit is processed by the first OC driver in the first branching device and then sent to the signal control system.

8. The method for acquiring speed pulse signals of a tram signal control system according to claim 7, characterized in that: Also includes: Processing another speed pulse signal output by the first speed sensor through a differential receiver in the second branching device; The speed pulse signal output by the differential receiver is electrically isolated into one speed pulse signal through each electrical isolation circuit in the second branching device; The speed pulse signal output by one electrical isolation circuit is processed by the first OC driver in the second branching device and then sent to the signal control system.

9. The method for acquiring speed pulse signals of a tram signal control system according to claim 7, characterized in that: Also includes: The speed pulse signals output by other electrical isolation circuits are processed by the second OC driver in the first branching device and then sent to other systems of the tram.

10. The method for acquiring speed pulse signal of a tram signal control system according to any one of claims 6 to 9, characterized in that: Also includes: Converting a speed pulse signal outputted by a second speed sensor of the vehicle traction system into multiple speed pulse signals through a third branching device; Sending one speed pulse signal of the multiple speed pulse signals to the vehicle braking system of the tram, and sending another speed pulse signal to the signal control system of the tram; Another speed pulse signal output by the second speed sensor is converted by a fourth branch device, and the speed pulse signal obtained after the conversion is sent to the signal control system, so that the signal control system can simulate a speed pulse signal based on the speed pulse signals received from the third branch device and the fourth branch device when it is determined that the first speed sensor is abnormal.

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