CN113098520A - Digital-to-analog conversion device, display control method and electronic equipment for train speed per hour - Google Patents
Digital-to-analog conversion device, display control method and electronic equipment for train speed per hour Download PDFInfo
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- CN113098520A CN113098520A CN202110361576.0A CN202110361576A CN113098520A CN 113098520 A CN113098520 A CN 113098520A CN 202110361576 A CN202110361576 A CN 202110361576A CN 113098520 A CN113098520 A CN 113098520A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000012544 monitoring process Methods 0.000 claims abstract description 59
- 238000005259 measurement Methods 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L15/00—Indicators provided on the vehicle or train for signalling purposes
- B61L15/009—On-board display devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
- B61L25/02—Indicating or recording positions or identities of vehicles or trains
- B61L25/021—Measuring and recording of train speed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
- G01P3/54—Devices characterised by the use of electric or magnetic means for measuring linear speed by measuring frequency of generated current or voltage
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Abstract
The application discloses a digital-to-analog conversion device, a display control method and electronic equipment for train speed per hour, wherein the digital-to-analog conversion device is respectively connected with a monitoring host, a speed sensor and a double-needle speedometer of a train; the digital-to-analog conversion device comprises a frequency-to-voltage conversion circuit and a voltage-to-current conversion circuit; when the monitoring host works normally, the digital-to-analog conversion device is used for driving the double-needle speedometer based on a current type signal which is sent by the monitoring host and is related to the speed per hour of the train; when the monitoring host is in power failure, the digital-to-analog conversion device is used for acquiring frequency type signals which are detected by the speed sensor and related to the speed per hour of the train, and converting the frequency type signals into corresponding current type signals based on the frequency-to-voltage conversion circuit and the voltage-to-current conversion circuit so as to drive the double-needle speedometer and realize the uninterrupted display of the speed per hour of the train. The system and the method have the advantages that based on the modules such as the frequency-voltage conversion circuit and the voltage-current conversion circuit which are arranged inside, the uninterrupted display of the speed per hour of the train can be realized after the monitoring host is shut down, and the driving safety of the train is guaranteed.
Description
Technical Field
The application relates to the technical field of train running state monitoring, in particular to a digital-to-analog conversion device, a display control method and electronic equipment for train speed per hour.
Background
For various internal combustion engines, electric locomotives and electric motor trains, a monitoring host in a driver control room is generally used for assisting speed display. Therefore, once the monitoring host is shut down due to power failure or fault, the speed per hour of the train cannot be recorded and displayed. In view of the above, it is an important need for those skilled in the art to provide a solution to the above technical problems.
Disclosure of Invention
The application aims to provide a digital-to-analog conversion device, a display control method and electronic equipment for the speed per hour of a train, so that the speed per hour can be continuously displayed, and the safe running of the train is guaranteed.
In order to solve the technical problem, on one hand, the application discloses a digital-to-analog conversion device for the speed per hour of a train, wherein the digital-to-analog conversion device is respectively connected with a monitoring host, a speed sensor and a double-needle speedometer of the train; the digital-to-analog conversion device comprises a frequency-to-voltage conversion circuit and a voltage-to-current conversion circuit;
when the monitoring host works normally, the digital-to-analog conversion device is used for driving the double-needle speedometer based on a current type signal which is sent by the monitoring host and is related to the speed per hour of the train;
when the monitoring host is powered off, the digital-to-analog conversion device is used for acquiring a frequency type signal which is detected by the speed sensor and is related to the speed per hour of the train, and converting the frequency type signal into a corresponding current type signal based on the frequency-to-voltage conversion circuit and the voltage-to-current conversion circuit so as to drive the double-needle speedometer and realize the uninterrupted display of the speed per hour of the train.
Optionally, when the digital-to-analog conversion device converts the frequency-type signal into a corresponding current-type signal based on the frequency-to-voltage conversion circuit and the voltage-to-current conversion circuit, the digital-to-analog conversion device is specifically configured to:
filtering, isolating and amplifying the frequency type signal to obtain a preprocessed signal; generating a voltage type signal corresponding to the pre-processing signal based on the frequency-voltage conversion circuit; generating the current mode signal corresponding to the voltage mode signal based on the voltage-to-current conversion circuit.
Optionally, the digital-to-analog conversion device further includes an odometer driving circuit, and the digital-to-analog conversion device is connected to the odometer; when the monitoring host is power-off, the digital-to-analog conversion device is further configured to:
and outputting a pulse signal for mileage measurement to the odometer according to the frequency type signal based on the odometer driving circuit.
Optionally, the digital-to-analog conversion device outputs a pulse signal for mileage measurement to the mileage timer based on the mileage meter driving circuit according to the frequency type signal, and is specifically configured to:
acquiring the preprocessed signal generated after the frequency type signal is filtered, isolated and amplified; the preprocessed signal is frequency-divided based on the odometer driving circuit so as to output a pulse signal for odometry.
Optionally, the digital-to-analog conversion apparatus further includes a driving configuration circuit; the digital-to-analog conversion device is further configured to, before outputting a pulse signal for odometry to the odometer based on the odometer driving circuit according to the frequency type signal, further:
and configuring the current frequency division number and the maximum frequency division number of the counter in the odometer driving circuit based on the driving configuration circuit.
Optionally, before configuring, based on the driving configuration circuit, the current frequency division number and the maximum frequency division number of the counter in the odometer driving circuit, the digital-to-analog conversion apparatus is further configured to:
and calculating and determining the value of the current frequency division number based on the speed range of the double-needle speedometer, the wheel diameter of the train and the number of pulses per revolution of the speed sensor.
Optionally, the digital-to-analog conversion apparatus is specifically configured to:
and receiving a cab switching signal sent by the monitoring host so as to judge whether the monitoring host works normally or not according to the existence of the cab switching signal.
In another aspect, the application discloses a display control method for train speed per hour, which is applied to a digital-to-analog conversion device respectively connected with a monitoring host, a speed sensor and a double-needle speedometer of a train; the digital-to-analog conversion device comprises a frequency-to-voltage conversion circuit and a voltage-to-current conversion circuit; the method comprises the following steps:
judging whether the monitoring host works normally or not;
if the monitoring host works normally, the double-needle speedometer is driven based on a current type signal which is sent by the monitoring host and is about the speed per hour of the train;
if the monitoring host is power-off, acquiring a frequency type signal which is detected by the speed sensor and is related to the speed per hour of the train, and converting the frequency type signal into a corresponding current type signal based on the frequency-voltage conversion circuit and the voltage-current conversion circuit so as to drive the double-needle speedometer and realize the uninterrupted display of the speed per hour of the train.
Optionally, the digital-to-analog conversion device further includes an odometer driving circuit, and the digital-to-analog conversion device is connected to the odometer; after acquiring the frequency type signal which is detected by the speed sensor and relates to the speed per hour of the train, the method further comprises the following steps:
and outputting a pulse signal for mileage measurement to the odometer according to the frequency type signal based on the odometer driving circuit.
In yet another aspect, the present application discloses an electronic device comprising:
a memory for storing a computer program;
a processor for executing said computer program to implement the steps of any of the above described methods of display control of speed per train.
The digital-to-analog conversion device, the display control method and the electronic equipment for the train speed per hour have the advantages that: this application can be handled speedtransmitter's detected signal by oneself after the shutdown of monitoring host computer based on modules such as the frequency voltage converting circuit of inside setting, pressure stream converting circuit, generate the current mode signal that can the direct drive duplex speedometer to realize the incessant demonstration of train speed per hour, help guarantee train driving safety.
Drawings
In order to more clearly illustrate the technical solutions in the prior art and the embodiments of the present application, the drawings that are needed to be used in the description of the prior art and the embodiments of the present application will be briefly described below. Of course, the following description of the drawings related to the embodiments of the present application is only a part of the embodiments of the present application, and it will be obvious to those skilled in the art that other drawings can be obtained from the provided drawings without any creative effort, and the obtained other drawings also belong to the protection scope of the present application.
Fig. 1 is a block diagram of a digital-to-analog conversion apparatus for train speed per hour according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a generation process of an amperometric signal for driving a two-pin speedometer according to an embodiment of the present application;
fig. 3 is a flowchart of a display control method for speed per hour of a train according to an embodiment of the present application;
fig. 4 is a block diagram of an electronic device according to an embodiment of the present disclosure.
Detailed Description
The core of the application lies in providing a digital-to-analog conversion device, a display control method and electronic equipment for the speed per hour of a train, so that the continuous display of the speed per hour is realized, and the safe running of the train is guaranteed.
In order to more clearly and completely describe the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, the embodiment of the application discloses a digital-to-analog conversion device for train speed per hour, wherein the digital-to-analog conversion device is respectively connected with a monitoring host, a speed sensor and a double-needle speedometer of a train; the digital-to-analog conversion device comprises a frequency-to-voltage conversion circuit 101 and a voltage-to-current conversion circuit 102;
when the monitoring host works normally, the digital-to-analog conversion device is used for driving the double-needle speedometer based on a current type signal which is sent by the monitoring host and is related to the speed per hour of the train;
when the monitoring host is powered off, the digital-to-analog conversion device is used for acquiring frequency type signals which are detected by the speed sensor and are related to the speed per hour of the train, and converting the frequency type signals into corresponding current type signals based on the frequency-to-voltage conversion circuit 101 and the voltage-to-current conversion circuit 102 so as to drive the double-needle speedometer and realize the uninterrupted display of the speed per hour of the train.
Specifically, the digital-to-analog conversion device for train speed per hour disclosed by the embodiment of the application is specifically connected between the monitoring host and the two-pin speedometer. Under the condition that the monitoring host machine works normally, the monitoring host machine can process the speed signal detected by the speed sensor to generate a current mode signal capable of directly driving the double-needle speedometer. The data conversion device receives the current type signal sent by the monitoring host and forwards the current type signal to the double-needle speedometer, so that speed display is realized.
When the monitoring host is shut down due to power failure or faults and the like, the digital-to-analog conversion device starts a built-in frequency-voltage conversion circuit 101 and a built-in voltage-current conversion circuit 102 for speed display, performs signal processing on a frequency type signal of the train speed per hour directly acquired from a speed sensor, automatically generates a current type signal capable of driving the double-needle speedometer, and sends the current type signal to the double-needle speedometer. The frequency-voltage conversion circuit 101 is a frequency-to-voltage circuit, and the voltage-to-current conversion circuit is a voltage-to-current circuit.
It should be noted that the digital-to-analog conversion device does not operate depending on the power supply of the monitoring host because the digital-to-analog conversion device is provided with a power supply circuit capable of supplying power from the locomotive power supply and supplying power to the speed sensor when the monitoring host is turned off.
Specifically, as a specific embodiment, the hardware structure of the digital-to-analog conversion apparatus may specifically include a power supply, a control board, and a conversion circuit board. The power supply and the control board provide power for the digital-to-analog conversion device and generate corresponding control signals to control the conversion circuit board; the conversion circuit board is provided with functional circuits including a frequency-voltage conversion circuit 101, a voltage-current conversion circuit 102 and the like.
It can be seen that, the digital-to-analog conversion device for train speed per hour disclosed in the embodiment of the present application, based on the modules such as the frequency-to-voltage conversion circuit 101 and the voltage-to-current conversion circuit 102 that are internally disposed, can automatically process the detection signal of the speed sensor after the monitoring host is shut down, and generate a current type signal that can directly drive the two-pin speedometer, thereby implementing uninterrupted display of train speed per hour and helping to ensure train running safety.
As a specific embodiment, on the basis of the foregoing content, the digital-to-analog conversion apparatus for train speed per hour disclosed in the embodiment of the present application is specifically configured to:
and receiving a cab switching signal sent by the monitoring host so as to judge whether the monitoring host works normally or not according to the existence of the cab switching signal.
Specifically, a power supply and a control panel of the digital-to-analog conversion device are specifically connected with a cab switching signal output end of the monitoring host. When the monitoring host normally outputs a cab starting signal, the digital-to-analog conversion device directly transmits a current type signal sent by the monitoring host to the two-pin speedometer; when the monitoring host does not normally output the starting signal, the power supply and the control board of the digital-to-analog conversion device can control the conversion circuit board to carry out speed signal conversion so as to drive the double-needle speedometer.
As a specific embodiment, on the basis of the above content, the digital-to-analog conversion apparatus for train speed per hour disclosed in the embodiment of the present application is specifically configured to, when the frequency-to-voltage conversion circuit 101 and the voltage-to-current conversion circuit 102 convert a frequency-type signal into a corresponding current-type signal:
filtering, isolating and amplifying the frequency type signal to obtain a preprocessed signal; generating a voltage type signal corresponding to the preprocessed signal based on the frequency-voltage conversion circuit 101; the current mode signal corresponding to the voltage mode signal is generated based on the voltage-to-current conversion circuit 102.
Specifically, a schematic diagram of the generation process of the current mode signal for driving the two-pin speedometer can be seen in fig. 2. The current value of the generated current type signal is within the range of 0-20 mA and corresponds to a certain speed value. The speed value is displayed in a two-needle speedometer, and depends on the frequency value of the frequency type signal output by the speed sensor, and the following relation is satisfied between the two values:
f＝(v·1000/3600)·C/(π·D)；
wherein f is the frequency value of the frequency type signal output by the speed sensor; v is a speed value, and the unit is km/h; c is the number of pulses per revolution of the speed sensor, and the unit is P/R; d is the wheel diameter of the train and the unit is m.
As a specific embodiment, the digital-to-analog conversion device for train speed per hour disclosed in the embodiment of the present application further includes an odometer driving circuit on the basis of the above contents, and the digital-to-analog conversion device is connected to the odometer; when the monitoring host loses power, the digital-to-analog conversion device is also used for:
based on the odometer driving circuit, a pulse signal for mileage measurement is output to the odometer according to the frequency type signal.
Specifically, the digital-to-analog conversion device for the train speed per hour disclosed in the embodiment of the present application may be further connected to the odometer, and output of the odometer pulse signal is substituted when the monitoring host is turned off. Specifically, generally, the odometer can be operated once corresponding to the output pulse every 1 km for the driving range of the train by the related arrangement of the odometer driving circuit.
As a specific embodiment, the digital-to-analog conversion device for train speed per hour disclosed in the embodiment of the present application, based on the above content, outputs a pulse signal for mileage measurement to a mileage timer according to a frequency type signal based on a mileage meter driving circuit, and is specifically configured to:
acquiring a preprocessing signal generated after filtering, isolating and amplifying a frequency type signal; the frequency division is performed on the preprocessed signal based on the odometer driving circuit to output a pulse signal for odometry.
Specifically, the preprocessed signal for speed display may be further sent to a odometer driving circuit, so as to perform mileage metering by frequency division, because the metering of the train mileage depends on the speed per hour of the train, and the relationship between the two is specifically:
S＝N·π·D/C；
wherein S is the driving mileage of the train; n is the frequency division number of the counter in the odometer driving circuit; d is the wheel diameter of the train; c is the number of pulses per revolution of the speed sensor and has the unit of P/R.
As a specific embodiment, the digital-to-analog conversion device for train speed per hour disclosed in the embodiment of the present application further includes a driving configuration circuit on the basis of the above contents; the digital-to-analog conversion means is further configured to, before outputting the pulse signal for odometry to the odometer based on the odometer drive circuit in accordance with the frequency type signal, further:
and configuring the current frequency division number and the maximum frequency division number of the counter in the odometer driving circuit based on the driving configuration circuit.
As a specific embodiment, on the basis of the above content, the digital-to-analog conversion apparatus for train speed per hour disclosed in the embodiment of the present application is further configured, before configuring, based on the driving configuration circuit, the current frequency division number and the maximum frequency division number of the counter in the odometer driving circuit, to:
and calculating and determining the value of the current frequency dividing number based on the speed range of the double-needle speedometer, the wheel diameter of the train and the number of pulses per revolution of the speed sensor.
In particular, considering that the wheel diameters of the locomotives may be different among different types of locomotives, the number of pulses per revolution of a speed sensor used on the locomotive and the speed range of the two-pin speedometer may also be different, and the current frequency division number of the counter in the odometer driving circuit needs to be correspondingly adjusted, therefore, the present application provides a function of modifying the configuration of the counter in the odometer driving circuit, so that a person skilled in the art can adjust the frequency division number and the maximum value of the frequency division number. Therefore, the embodiment can conveniently realize the compatibility of different types of locomotives, different signal speed sensors and double-needle speedometers.
Referring to fig. 3, the embodiment of the present application discloses a display control method for train speed per hour, which is applied to a digital-to-analog conversion device respectively connected to a monitoring host, a speed sensor and a two-pointer speedometer of a train; the digital-to-analog conversion device comprises a frequency-to-voltage conversion circuit and a voltage-to-current conversion circuit; the method comprises the following steps:
s201: judging whether the monitoring host works normally or not; if yes, entering S202; if not, the process proceeds to S203.
S202: and driving the double-needle speedometer based on the current type signal which is sent by the monitoring host and relates to the speed per hour of the train.
S203: acquiring a frequency type signal which is detected by a speed sensor and is related to the speed per hour of the train; the process proceeds to S204.
S204: based on the frequency-voltage conversion circuit and the voltage-current conversion circuit, the frequency type signal is converted into a corresponding current type signal to drive the double-needle speedometer, and the continuous display of the train speed per hour is realized.
Therefore, the display control method for the train speed per hour provided by the application can automatically process the detection signal of the speed sensor after the monitoring host is shut down based on the modules such as the frequency-voltage conversion circuit and the voltage-current conversion circuit which are arranged inside, and generate the current type signal capable of directly driving the double-needle speedometer, so that the uninterrupted display of the train speed per hour is realized, and the running safety of the train is ensured.
For the specific content of the display control method for the speed per hour of the train, reference may be made to the detailed description of the digital-to-analog conversion device for the speed per hour of the train, and details thereof are not repeated here.
As a specific embodiment, the method for controlling display of train speed per hour provided in the embodiment of the present application, based on the above, converts a frequency-type signal into a corresponding current-type signal based on a frequency-voltage conversion circuit and a voltage-current conversion circuit to drive a two-pin speed meter, including:
filtering, isolating and amplifying the frequency type signal to obtain a preprocessed signal;
generating a voltage type signal corresponding to the pre-processing signal based on the frequency-voltage conversion circuit;
a current mode signal corresponding to the voltage mode signal is generated based on the voltage-to-current conversion circuit.
As a specific embodiment, in the display control method for train speed per hour provided by the embodiment of the present application, on the basis of the above contents, the digital-to-analog conversion device further includes an odometer driving circuit, and the digital-to-analog conversion device is connected to the odometer; after acquiring the frequency type signal about the speed per hour of the train detected by the speed sensor, the method further comprises the following steps:
based on the odometer driving circuit, a pulse signal for mileage measurement is output to the odometer according to the frequency type signal.
As a specific embodiment, the method for controlling display of train speed per hour provided in the embodiment of the present application, based on the above, outputs a pulse signal for mileage measurement to the odometer according to the frequency-type signal by the odometer driving circuit, and specifically includes:
acquiring a preprocessing signal generated after filtering, isolating and amplifying a frequency type signal;
the frequency division is performed on the preprocessed signal based on the odometer driving circuit to output a pulse signal for odometry.
As a specific embodiment, in the display control method for train speed per hour provided in the embodiment of the present application, on the basis of the above contents, the digital-to-analog conversion device further includes a driving configuration circuit; before the odometer-based driving circuit outputs a pulse signal for odometry to the odometer according to the frequency-type signal, the odometer-based driving circuit is further configured to:
and configuring the current frequency division number and the maximum frequency division number of the counter in the odometer driving circuit based on the driving configuration circuit.
As a specific embodiment, on the basis of the above contents, before configuring, based on the driving configuration circuit, the current frequency division number and the maximum frequency division number of the counter in the odometer driving circuit, the method for controlling display of the train speed per hour provided in the embodiment of the present application is further configured to:
and calculating and determining the value of the current frequency dividing number based on the speed range of the double-needle speedometer, the wheel diameter of the train and the number of pulses per revolution of the speed sensor.
As a specific embodiment, the method for controlling display of train speed per hour provided in the embodiment of the present application further includes, on the basis of the foregoing content:
and receiving a cab switching signal sent by the monitoring host so as to judge whether the monitoring host works normally or not according to the existence of the cab switching signal.
Referring to fig. 4, an embodiment of the present application discloses an electronic device, including:
a memory 301 for storing a computer program;
a processor 302 for executing a computer program to implement the steps of any of the above methods for controlling the display of train speed per hour.
For the details of the electronic device, reference may be made to the foregoing detailed description of the display control method for speed per hour of a train, and details thereof are not repeated here.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the equipment disclosed by the embodiment, the description is relatively simple because the equipment corresponds to the method disclosed by the embodiment, and the relevant parts can be referred to the method part for description.
It is further noted that, throughout this document, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The technical solutions provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall into the protection scope of the present application.
Claims (10)
1. A D/A conversion device for train speed per hour is characterized in that the D/A conversion device is respectively connected with a monitoring host, a speed sensor and a double-needle speedometer of a train; the digital-to-analog conversion device comprises a frequency-to-voltage conversion circuit and a voltage-to-current conversion circuit;
when the monitoring host works normally, the digital-to-analog conversion device is used for driving the double-needle speedometer based on a current type signal which is sent by the monitoring host and is related to the speed per hour of the train;
when the monitoring host is powered off, the digital-to-analog conversion device is used for acquiring a frequency type signal which is detected by the speed sensor and is related to the speed per hour of the train, and converting the frequency type signal into a corresponding current type signal based on the frequency-to-voltage conversion circuit and the voltage-to-current conversion circuit so as to drive the double-needle speedometer and realize the uninterrupted display of the speed per hour of the train.
2. The dac apparatus of claim 1, wherein the dac apparatus, when converting the frequency-type signal into a corresponding current-type signal based on the frequency-to-voltage conversion circuit and the voltage-to-current conversion circuit, is specifically configured to:
filtering, isolating and amplifying the frequency type signal to obtain a preprocessed signal; generating a voltage type signal corresponding to the pre-processing signal based on the frequency-voltage conversion circuit; generating the current mode signal corresponding to the voltage mode signal based on the voltage-to-current conversion circuit.
3. The digital-to-analog conversion device according to claim 2, further comprising an odometer driving circuit, wherein the digital-to-analog conversion device is connected with an odometer; when the monitoring host is power-off, the digital-to-analog conversion device is further configured to:
and outputting a pulse signal for mileage measurement to the odometer according to the frequency type signal based on the odometer driving circuit.
4. The dac apparatus of claim 3, wherein the dac apparatus outputs a pulse signal for odometry to the odometer based on the odometer driving circuit according to the frequency-type signal, and is specifically configured to:
acquiring the preprocessed signal generated after the frequency type signal is filtered, isolated and amplified; the preprocessed signal is frequency-divided based on the odometer driving circuit so as to output a pulse signal for odometry.
5. The digital-to-analog conversion apparatus according to claim 4, wherein the digital-to-analog conversion apparatus further comprises a driving configuration circuit; the digital-to-analog conversion device is further configured to, before outputting a pulse signal for odometry to the odometer based on the odometer driving circuit according to the frequency type signal, further:
and configuring the current frequency division number and the maximum frequency division number of the counter in the odometer driving circuit based on the driving configuration circuit.
6. The digital-to-analog conversion apparatus according to claim 5, wherein the digital-to-analog conversion apparatus, before configuring the current frequency division number and the maximum frequency division number of the counter in the odometer driving circuit based on the driving configuration circuit, is further configured to:
and calculating and determining the value of the current frequency division number based on the speed range of the double-needle speedometer, the wheel diameter of the train and the number of pulses per revolution of the speed sensor.
7. The digital-to-analog conversion device according to any one of claims 1 to 6, wherein the digital-to-analog conversion device is specifically configured to:
and receiving a cab switching signal sent by the monitoring host so as to judge whether the monitoring host works normally or not according to the existence of the cab switching signal.
8. A display control method of train speed per hour is characterized in that the display control method is applied to a digital-to-analog conversion device which is respectively connected with a monitoring host, a speed sensor and a double-needle speedometer of a train; the digital-to-analog conversion device comprises a frequency-to-voltage conversion circuit and a voltage-to-current conversion circuit; the method comprises the following steps:
judging whether the monitoring host works normally or not;
if the monitoring host works normally, the double-needle speedometer is driven based on a current type signal which is sent by the monitoring host and is about the speed per hour of the train;
if the monitoring host is power-off, acquiring a frequency type signal which is detected by the speed sensor and is related to the speed per hour of the train, and converting the frequency type signal into a corresponding current type signal based on the frequency-voltage conversion circuit and the voltage-current conversion circuit so as to drive the double-needle speedometer and realize the uninterrupted display of the speed per hour of the train.
9. The display control method according to claim 8, wherein the digital-to-analog conversion means further comprises an odometer driving circuit, the digital-to-analog conversion means being connected to an odometer; after acquiring the frequency type signal which is detected by the speed sensor and relates to the speed per hour of the train, the method further comprises the following steps:
and outputting a pulse signal for mileage measurement to the odometer according to the frequency type signal based on the odometer driving circuit.
10. An electronic device, comprising:
a memory for storing a computer program;
a processor for executing said computer program to implement the steps of the display control method of train speed per hour as claimed in claim 8 or 9.
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| WO2019119494A1 (en) * | 2017-12-20 | 2019-06-27 | 中车长春轨道客车股份有限公司 | Determining method and system for real-time driving speed of train and related devices |
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| US5805797A (en) * | 1994-12-28 | 1998-09-08 | Hitachi, Ltd. | Controller having a fail safe function, automatic train controller and system using the same |
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