Locomotive speed measuring device

Abstract

The invention provides a locomotive speed measuring device, which comprises an ultrasonic generator arranged at the front end of a locomotive head and used for transmitting ultrasonic waves to a rail; the ultrasonic receiver is arranged at the front end of the locomotive head and is used for receiving reflected wave beams formed after being reflected by the rails; the controller is in communication connection with the ultrasonic receiver and is used for receiving the reflected wave beam and determining the speed of the current locomotive according to the reflected wave beam; and the vehicle speed alarm module is in communication connection with the controller and gives an alarm when the vehicle speed of the locomotive exceeds a preset threshold value. The vehicle speed is measured through ultrasonic waves, so that the speed measurement error caused by wheel idling in the traction acceleration stage and wheel slipping in the braking deceleration stage of the locomotive can be effectively avoided, and the reliability is good.

Description

Technical Field

[0001] This invention relates to the field of locomotive speed measurement technology, and in particular to a locomotive speed measurement device. Background Art

[0002] In recent years, industrialization and automation have been accelerating year by year. Rail transit is developing towards high density and automation, and the automatic control technology of mining locomotives has also put forward higher requirements for the accuracy and safety of locomotive speed measurement technology.

[0003] Currently, the common practice is to take the wheel speed at the axle and then calculate it backwards. However, this speed cannot be guaranteed to be accurate when the wheels slip. Wheel spin during the traction acceleration phase and wheel slippage during the braking deceleration phase are key factors leading to large errors in locomotive speed measurement. In order to ensure the safe operation of locomotives, it is necessary to improve the accuracy of locomotive speed measurement.

[0004] Currently, besides the mainstream method of converting rotational speed to speed, other speed measurement methods involving the coordination of multiple sensing devices have emerged in the automation process. For example, vision combined with electronic maps can be used to calculate vehicle speed by measuring the distance changes between the vehicle and the map markers using LiDAR, cameras, and millimeter-wave radar. However, this method fails in areas where electronic maps are not built. UWB speed measurement solutions can only be used in signal environments, and the locomotive operating environment is full of concrete and metal, in which UWB signals cannot penetrate. If electronic tag speed measurement is to improve the measurement effect, electronic tags need to be placed all over the track in the operating area. Although it can achieve the desired effect, it can only be implemented in specific areas and the workload is large. Roadside equipment combined with vehicle networking cannot guarantee real-time performance, and in industrial and mining environments, the measurement of roadside equipment is inevitably obstructed, making it unsuitable for providing speed information in all areas. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the objective of this invention is to provide a locomotive speed measuring device.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] A locomotive speed measuring device, comprising:

[0008] An ultrasonic generator is installed at the front of the locomotive head and is used to emit ultrasonic waves toward the rails.

[0009] An ultrasonic receiver is installed at the front of the locomotive to receive the reflected beam formed after being reflected by the rails.

[0010] The controller is communicatively connected to the ultrasonic receiver and is used to receive the reflected beam and determine the current speed of the locomotive based on the reflected beam.

[0011] The vehicle speed alarm module is connected to the controller and issues an alarm when the vehicle speed exceeds a preset threshold.

[0012] Preferably, the vehicle speed alarm module includes:

[0013] A first resistor R1 is connected to the controller at one end, and the other end of the first resistor R1 is connected to one end of a second resistor R2, with the other end of the second resistor R2 grounded.

[0014] Transistor Q1, the base of transistor Q1 is connected to the other end of the first resistor R1, the emitter of transistor Q1 is grounded, and the collector of transistor Q1 is connected to the negative terminal of alarm BZ.

[0015] The second capacitor C2 has one end connected to the positive terminal of the alarm BZ, and the other end connected to ground.

[0016] Preferably, the positive terminal of the alarm BZ is connected to the power supply terminal VCC.

[0017] Preferred options also include:

[0018] The first capacitor C1 has one end connected to the base of the transistor Q1, and the other end grounded.

[0019] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0020] This invention provides a locomotive speed measuring device. Compared with the prior art, this invention uses ultrasonic waves to measure the vehicle speed, which can effectively avoid the speed measurement errors caused by wheel spin during the traction acceleration phase and wheel slippage during the braking deceleration phase, and has good reliability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 The schematic diagram of the vehicle speed alarm module provided by this invention;

[0023] Figure 2 This is a schematic diagram illustrating the working principle of the ultrasonic velocimeter provided by the present invention. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, including a series of steps, processes, methods, etc., is not limited to the steps listed, but may optionally include steps not listed, or may optionally include other steps inherent to these processes, methods, products, or devices.

[0027] To make the above-mentioned objectives, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Please see Figure 1-2 A locomotive speed measuring device includes: an ultrasonic speedometer, installed at the front of the locomotive cab, for measuring vehicle speed. The ultrasonic speedometer includes: an ultrasonic generator, an ultrasonic receiver, and a controller.

[0029] An ultrasonic generator is installed at the front of the locomotive head and is used to emit ultrasonic waves toward the rails.

[0030] An ultrasonic receiver is installed at the front of the locomotive to receive the reflected beam formed after being reflected by the rails.

[0031] The controller is communicatively connected to the ultrasonic receiver and is used to receive the reflected beam and determine the current speed of the locomotive based on the reflected beam.

[0032] The vehicle speed alarm module is connected to the controller and issues an alarm when the vehicle speed exceeds a preset threshold.

[0033] For further details, please refer to Figure 1 The vehicle speed alarm module includes:

[0034] A first resistor R1 is connected to the controller at one end, and the other end of the first resistor R1 is connected to one end of a second resistor R2, with the other end of the second resistor R2 grounded.

[0035] Transistor Q1, the base of transistor Q1 is connected to the other end of the first resistor R1, the emitter of transistor Q1 is grounded, and the collector of transistor Q1 is connected to the negative terminal of alarm BZ.

[0036] The second capacitor C2 has one end connected to the positive terminal of the alarm BZ, and the other end connected to ground.

[0037] The positive terminal of the alarm BZ is connected to the power supply terminal VCC.

[0038] A first capacitor C1 is connected at one end to the base of transistor Q1, and the other end of the first capacitor C1 is grounded. When the locomotive's speed exceeds a preset threshold, the controller sends a current signal to the first resistor R1, causing transistor Q1 to conduct, thereby triggering the overspeed alarm BZ.

[0039] In acoustics, when a moving object (such as a car or train) emits sound, an observer closer to the object will perceive the sound frequency as higher, while an observer farther away will perceive the sound frequency as lower. This phenomenon is called the "acoustic Doppler effect," and ultrasonic velocimeters are based on this principle.

[0040] Please see Figure 2 Ultrasonic speed measuring instruments emit continuous ultrasonic beams towards the railway sleepers while the train is in motion. Since the distance between the sleepers in the railway is relatively fixed, when the locomotive moves relative to the sleepers, the beams are compressed when they encounter the sleepers. Different speed lines will reflect the beams at different frequencies, and the receiver will capture the reflected beams. Due to the Doppler effect, the faster the train is running, the higher the frequency received; when the train decelerates, the frequency received decreases accordingly. By processing the echo signals, the current running speed of the train can be calculated. This method effectively avoids speed measurement errors caused by wheel slippage during the braking and deceleration phases, has high reliability, and does not require other sensors or electronic maps, making it low-cost.

[0041] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Regarding the methods disclosed in the embodiments, since they correspond to the apparatus disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the apparatus description.

[0042] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A locomotive speed measuring device, characterized in that: include: An ultrasonic generator is arranged at the front end of the locomotive and is used to emit ultrasonic waves to the rails; An ultrasonic receiver is arranged at the front end of the locomotive head and is used to receive the reflected wave beam formed after being reflected by the rails; A controller, connected in communication with the ultrasonic receiver, configured to receive the reflected beam and determine the current speed of the locomotive according to the reflected beam; The vehicle speed alarm module is connected to the controller for communicating with the controller, and sounds an alarm when the vehicle speed exceeds a preset threshold.

2. A locomotive speed measuring device as claimed in claim 1, characterized in that: The vehicle speed alarm module comprises: A first resistor (R1), one end of the first resistor (R1) is connected to the controller, the other end of the first resistor (R1) is connected to one end of a second resistor (R2), and the other end of the second resistor (R2) is grounded; A transistor (Q1), wherein the base of the transistor (Q1) is connected to the other end of the first resistor (R1), the emitter of the transistor (Q1) is grounded, and the collector of the transistor (Q1) is connected to the negative electrode of the alarm (BZ); A second capacitor (C2), one end of the second capacitor (C2) is connected to the positive electrode of the alarm (BZ), and the other end of the second capacitor (C2) is grounded.

3. A locomotive speed measuring device as claimed in claim 2, characterized in that: The positive pole of the alarm (BZ) is connected to the power supply terminal (VCC).

4. A locomotive speed measuring device as claimed in claim 3, characterized in that: Also includes: A first capacitor (C1), one end of the first capacitor (C1) is connected to the base of the transistor (Q1), and the other end of the first capacitor (C1) is grounded.

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