CN107150676B - Device and method for monitoring braking process of rail car - Google Patents
Device and method for monitoring braking process of rail car Download PDFInfo
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- CN107150676B CN107150676B CN201710528243.6A CN201710528243A CN107150676B CN 107150676 B CN107150676 B CN 107150676B CN 201710528243 A CN201710528243 A CN 201710528243A CN 107150676 B CN107150676 B CN 107150676B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a device and a method for monitoring a braking process of a rail car. The device includes first pressure sensor, second pressure sensor, flow sensor, monitoring host computer, and first pressure sensor is used for measuring the internal pressure of balanced reservoir, and second pressure sensor is used for measuring the internal pressure that the braking was responsible for, and flow sensor is used for measuring the air mass flow between relay valve and the braking is responsible for, and monitoring host computer is used for gathering the pressure value that pressure sensor surveyed and the flow value that flow sensor surveyed to confirm the parameter in the railcar braking process according to pressure value and flow value: and the air exhaust time, the air charging time, the main pipe air pressure leakage quantity and the air charging total flow quantity send out an alarm when the parameters exceed the set range. The device and the method for monitoring the braking process of the railway vehicle can automatically measure and judge the charging and exhausting time, the wind pressure leakage amount and the total charging flow rate of the braking main pipe of the railway vehicle, and the measurement and judgment results are objective and reliable.
Description
Technical Field
The invention relates to the field of rail car braking, in particular to a device and a method for monitoring a rail car braking process.
Background
The good braking performance of the rail car is a precondition for ensuring the safe operation of the rail car, and if the braking force is failed once the rail car is in operation, a serious accident that the car is damaged and the people are killed can occur. Although the standard of the primary crew operation procedure of the locomotive crew has strict operation requirements on the wind test process before starting, individual crew has weak business, does not stare at the wind table, does not pay attention to the arrangement and wind charging time, does not know and cannot judge the situation of the through of the rail car tube according to the arrangement and wind charging time, and seriously lacks the consciousness of confirming the through of the rail car tube through the wind test (the through of the rail car refers to the state of the rail car tube connection under the multi-car grouping and linking). Therefore, a great deal of potential safety hazards exist in the existing wind testing process.
Disclosure of Invention
The invention aims to provide a device and a method for monitoring the braking process of a railway vehicle, which can automatically measure and judge the charging and exhausting time, the air pressure leakage quantity and the total charging flow quantity of a main braking pipe of the railway vehicle, and have objective and reliable measuring and judging results.
In order to achieve the purpose, the invention provides the following scheme:
a railcar braking process monitoring device, the monitoring device comprising: the system comprises a first pressure sensor, a second pressure sensor, a flow sensor and a monitoring host, wherein the first pressure sensor is arranged in a balance air cylinder of the rail car, the second pressure sensor is arranged in a brake main pipe of the rail car, and the flow sensor is arranged between a relay valve and the brake main pipe of the rail car; first pressure sensor is used for measuring the internal pressure of balanced reservoir, second pressure sensor is used for measuring the internal pressure that the braking was responsible for, flow sensor is used for measuring relay valve and braking are responsible for the air flow between, the monitoring host computer is used for gathering the pressure value that first pressure sensor, second pressure sensor surveyed and the flow value that flow sensor measured, and according to the pressure value with the flow value is confirmed air exhaust time, the time of aerifing among the railcar braking process are responsible for the wind pressure leakage flow and are aerifyd the total flow, and work as when air exhaust time, the time of aerifing, be responsible for the wind pressure leakage flow and the total flow of aerifing surpass the settlement scope, send out the police dispatch newspaper.
Optionally, the monitoring device further comprises: the first display and the second display are used for displaying the air exhaust time, the air charging time, the main pipe air pressure leakage quantity and the total air charging flow quantity.
Optionally, the monitoring host selects an STM32F4XX series of ARM chips.
Optionally, the first pressure sensor, the second pressure sensor, and the flow sensor all use T1443P chips.
The invention also provides a method for monitoring the braking process of the rail car, which is applied to a monitoring device for the braking process of the rail car, and the monitoring device comprises: the system comprises a first pressure sensor, a second pressure sensor, a flow sensor and a monitoring host, wherein the first pressure sensor is arranged in a balance air cylinder of the rail car, the second pressure sensor is arranged in a brake main pipe of the rail car, and the flow sensor is arranged between a relay valve and the brake main pipe of the rail car; the monitoring host is used for acquiring pressure values measured by the first pressure sensor and the second pressure sensor and flow values measured by the flow sensors, determining air exhaust time, air charging time, main pipe air pressure leakage and total air charging flow in the braking process of the railcar according to the pressure values and the flow values, and giving an alarm when the air exhaust time, the air charging time, the main pipe air pressure leakage and the total air charging flow exceed a set range;
the rail car braking process monitoring method comprises the following steps:
in the process of braking and exhausting of the rail car, determining the exhaust time of the rail car;
determining the air pressure leakage amount of the main braking pipe of the rail car in the process of braking and pressure maintaining of the rail car;
determining the air charging time and the total air charging flow of the rail car in the braking and air charging process of the rail car;
judging whether the air exhaust time is within the range set by the standard air exhaust time;
if not, an alarm of abnormal air exhaust time is given;
judging whether the leakage amount is in a range set by a standard leakage amount or not;
if the leakage amount is not in the range set by the standard leakage amount, an alarm of abnormal leakage amount is given;
judging whether the air charging time is within a range set by standard air charging time;
if the charging time is not within the range set by the standard charging time, an alarm of abnormal charging time is given;
judging whether the total air charging flow is within a range set by a standard total air charging flow;
and if the total charging flow is not in the range set by the standard total charging flow, giving an alarm that the total charging flow is abnormal.
Optionally, in the process of braking and exhausting the rail car, determining the exhaust time of the rail car specifically includes:
timing the air exhaust time when the braking air exhaust process of the rail car begins;
collecting the pressure value inside the equalizing air cylinder in real time;
collecting the pressure value inside the brake main pipe in real time;
and when the pressure value in the equalizing air cylinder is equal to the pressure value in the braking main pipe, stopping timing the air exhaust time to obtain the air exhaust time.
Optionally, in the process of braking and pressure maintaining of the rail car, determining a wind pressure leakage amount of the main braking pipe of the rail car specifically includes:
when the pressure value in the equalizing air cylinder is equal to the pressure value in the braking main pipe, entering the braking pressure maintaining process of the rail car; starting to time the pressure maintaining time;
when the dwell time begins to be timed, collecting the internal pressure value of the brake main pipe, and recording the internal pressure value as a first pressure value;
when the pressure maintaining time reaches the set time, acquiring an internal pressure value of the brake main pipe, and recording the internal pressure value as a second pressure value;
and subtracting the first pressure value from the second pressure value to obtain the wind pressure leakage amount of the brake main pipe.
Optionally, the determining the charging time and the total charging flow rate of the railcar in the braking and charging process of the railcar specifically includes:
when the braking of the rail car enters the air charging process, starting to time the air charging time;
collecting the pressure value inside the equalizing air cylinder in real time;
collecting the pressure value inside the brake main pipe in real time;
when the pressure value in the equalizing air cylinder reaches 600kpa or 500kpa, collecting a flow value measured by the flow sensor, and recording the flow value as total air charging flow;
and when the pressure value in the equalizing air cylinder is equal to the internal pressure value of the brake main pipe, stopping timing the air charging time to obtain the air charging time.
Optionally, the determining the charging time and the total charging flow rate of the railcar in the braking and charging process of the railcar specifically includes:
when the braking of the rail car enters the air charging process, starting to time the air charging time;
collecting the pressure value inside the equalizing air cylinder in real time;
collecting the pressure value inside the brake main pipe in real time;
when the pressure value in the equalizing air cylinder reaches 600kpa or 500kpa, collecting a flow value measured by the flow sensor, and recording as total air charging flow;
and when the pressure fluctuation value in the main pipe of the railway vehicle is less than 10kpa, stopping timing the air charging time to obtain the air charging time.
Optionally, the set time is one minute.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the pressure sensors are arranged in the brake main pipe and the balance air cylinder of the rail car, the flow sensor is arranged between the relay valve and the brake main pipe of the rail car, the air charging time, the air discharging time, the total air charging flow and the leakage rate are measured in the air charging, air discharging and pressure maintaining stages of the brake process of the rail car by means of the measured data of the sensors, whether the potential safety hazard exists in the brake process of the rail car or not is judged according to the measurement result, the whole process is objective and reliable, and the rail car accident caused by improper manual inspection in the prior art is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of the structure of a device for monitoring the braking process of a railway vehicle according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for monitoring a braking process of a rail car according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
The invention aims to provide a device and a method for monitoring a braking process of a railway vehicle, which can automatically measure and judge the charging and exhausting time, the air pressure leakage quantity and the total charging flow quantity of a braking main pipe of the railway vehicle, and the measurement and judgment results are objective and reliable.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Fig. 1 is a block diagram illustrating a structure of a monitoring device for a braking process of a railway vehicle according to an embodiment of the present invention, and as shown in fig. 1, the monitoring device for a braking process of a railway vehicle according to the present invention includes: the system comprises a first pressure sensor 102, a second pressure sensor 103, a flow sensor 104 and a monitoring host 101, wherein the first pressure sensor 102 is arranged in an equalizing air cylinder of the rail car, the second pressure sensor 103 is arranged in a brake main pipe of the rail car, and the flow sensor 104 is arranged between a relay valve and the brake main pipe of the rail car; first pressure sensor 102 is used for measuring the internal pressure of balanced reservoir, second pressure sensor 103 is used for measuring the internal pressure that the braking was responsible for, flow sensor 104 is used for measuring air flow between relay valve and the braking is responsible for, monitoring host 101 is used for gathering the pressure value that first pressure sensor 102, second pressure sensor 103 measured and the flow value that flow sensor 104 measured, and the basis the pressure value with the flow value is confirmed air exhausting time, the time of charging the wind, be responsible for wind pressure leakage and the total flow of charging the wind in the railcar braking process, and work as when air exhausting time, the time of charging the wind, be responsible for leakage and the total flow of charging the wind exceed the settlement scope, send out the police dispatch newspaper.
The monitoring device further comprises: the first display 109 and the second display 105, the first display 109 and the second display 105 are all used for displaying the air exhaust time, the air charging time, the main pipe air pressure leakage quantity and the air charging flow quantity.
The monitoring host 101 communicates with the two displays through a CAN bus, and the monitoring host 101 communicates with a TAX box 106 (a railcar tool box) or a GYK device 1017 (a railcar remote maintenance monitoring system) through an RS422 bus or an RS485 bus.
The monitoring host 101 selects an STM32F4XX series ARM chip.
The first pressure sensor 102, the second pressure sensor 103 and the flow sensor 104 all adopt T1443P chips.
The rail car power supply 108 is connected with the monitoring host 101 and supplies power to the monitoring host 101.
The invention also provides a method for monitoring the braking process of the rail car, which is applied to a monitoring device for the braking process of the rail car, and the monitoring device comprises: the system comprises a first pressure sensor 102, a second pressure sensor 103, a flow sensor 104 and a monitoring host 101, wherein the first pressure sensor 102 is arranged in an equalizing air cylinder of the rail car, the second pressure sensor 103 is arranged in a brake main pipe of the rail car, and the flow sensor 104 is arranged between a relay valve and the brake main pipe of the rail car; the first pressure sensor 102 is used for measuring the internal pressure of the equalizing air cylinder, the second pressure sensor 103 is used for measuring the internal pressure of the main braking pipe, the flow sensor 104 is used for measuring the air flow between the relay valve and the main braking pipe, the monitoring host 101 is used for collecting the pressure values measured by the first pressure sensor 102 and the second pressure sensor 103 and the flow value measured by the flow sensor 104, determining the air exhaust time, the air charging time, the main pipe air pressure leakage quantity and the total air charging quantity in the braking process of the railcar according to the pressure values and the flow values, and giving an alarm when the air exhaust time, the air charging time, the main pipe air pressure leakage quantity and the total air charging quantity exceed the set ranges;
fig. 2 is a schematic flow chart of a method for monitoring a braking process of a railcar according to an embodiment of the present invention, and as shown in fig. 2, the method for monitoring the air braking process of the railcar includes the following steps:
step 201: in the process of braking and exhausting of the rail car, determining the exhaust time of the rail car;
step 202: determining the air pressure leakage amount of the main braking pipe of the rail car in the process of braking and pressure maintaining of the rail car;
step 203: determining the air charging time and the total air charging flow of the rail car in the braking and air charging process of the rail car;
step 204: judging whether the air exhaust time is within the range set by the standard air exhaust time;
step 205: if not, an alarm of abnormal air exhaust time is sent out;
step 206: judging whether the leakage amount is within a range set by a standard leakage amount or not;
step 207: if the leakage amount is not in the range set by the standard leakage amount, an alarm of abnormal leakage amount is sent out;
step 208: judging whether the air charging time is within a range set by standard air charging time;
step 209: if the charging time is not within the range set by the standard charging time, an alarm of abnormal charging time is given;
step 210: judging whether the total air charging flow is in a range set by a standard total air charging flow;
step 211: and if the total charging flow is not in the range set by the standard total charging flow, giving an alarm that the total charging flow is abnormal.
Wherein, step 201 specifically includes:
timing the air exhaust time when the braking air exhaust process of the rail car begins;
collecting the pressure value inside the equalizing air cylinder in real time;
collecting the pressure value inside the brake main pipe in real time;
and when the pressure value in the equalizing air cylinder is equal to the pressure value in the braking main pipe, stopping timing the air exhaust time to obtain the air exhaust time.
Step 202 specifically includes:
when the pressure value in the equalizing air cylinder is equal to the pressure value in the braking main pipe, entering the braking and pressure maintaining process of the rail car; starting to time the pressure maintaining time;
when the pressure maintaining time begins to be counted, collecting an internal pressure value of the brake main pipe, and recording the internal pressure value as a first pressure value;
when the pressure maintaining time reaches the set time, acquiring an internal pressure value of the brake main pipe, and recording the internal pressure value as a second pressure value;
and subtracting the first pressure value from the second pressure value to obtain the wind pressure leakage amount of the brake main pipe.
Step 203 specifically comprises:
when the braking of the rail car enters the air charging process, starting to time the air charging time;
collecting the pressure value inside the equalizing air cylinder in real time;
collecting the pressure value inside the brake main pipe in real time;
when the pressure value in the equalizing air cylinder reaches 600kpa or 500kpa, collecting a flow value measured by the flow sensor, and recording the flow value as total air charging flow;
and when the pressure value in the equalizing air cylinder is equal to the internal pressure value of the brake main pipe or when the pressure fluctuation value in the main pipe of the railway vehicle is less than 10kpa, stopping timing the air charging time.
According to the invention, the pressure sensors are arranged in the main braking pipe and the balance air cylinder of the rail car, the flow sensor is arranged between the relay valve and the main braking pipe of the rail car, the air charging time, the air discharging time, the total air charging flow and the leakage are measured in the air charging, air discharging and pressure maintaining stages of the braking process of the rail car by means of the measured data of the sensors, and whether the potential safety hazard exists in the braking process of the rail car is judged according to the measurement result, so that the whole process is objective and reliable, and the rail car accident caused by improper manual inspection in the prior art is avoided.
As another embodiment of the invention, the device calculates the air exhaust time and flow, air charging time and flow and leakage of the rail car pipe by detecting the pressure and flow of the equalizing air cylinder and the main pipe of the rail car, judges according to a given reference table and gives an alarm indication when exceeding the limit.
The detection of the air exhaust time TP of the rail car and the pressure leakage PX of the main pipe of the rail car: when a brake button K1 (or K2, K3) of the rail car is pressed, the rail car enters an exhaust stage in a braking process, a brake monitoring device firstly samples equilibrium air cylinder pressure PJ0, then the monitoring device sends out a 'pressure reduction instruction', an exhaust time counter starts to time, in the braking and exhaust process, the equilibrium air cylinder pressure firstly drops, an exhaust valve port of a relay valve is opened, the rail car main pipe pressure drops, when the equilibrium air cylinder pressure drops by 50kpa (or 70kpa, 100kpa and 170/140 kpa) from a constant pressure (500 or 600 kpa), the monitoring device sends out a 'pressure maintaining instruction', then the rail car pipe continues to exhaust air, the pressure continues to drop, and when the equilibrium air cylinder pressure PJ = the rail car main pipe pressure PL (namely PJ-PL = a)<10 kpa), the railcar brake system closes the exhaust valve port of the relay valve, and the exhaust time counter stops timing (at this time, the exhaust time counter value is TP); at the same time, the pressure maintaining timing is started (the main pipe pressure of the railway vehicle at this time is marked as PL) 0 ) And after one minute, sampling the current main pipe pressure of the railway vehicle, and recording as PL 1 According to the formula PX = PL 0 -PL 1 Calculating the leakage PX of the rail car pipe.
Detecting the air charging time TC and the air charging flow MX of the rail car: when a button K4 in a braking system of the rail car is pressed, the rail car feels that the braking process enters an air charging stage, a monitoring device sends an 'air charging relieving' instruction (namely, a 'pressure reducing instruction' and a 'pressure maintaining instruction' are cancelled at the same time), an air charging time counter starts to time, the pressure of a balance air cylinder rises at first, a relay valve air supply valve port is opened along with the balance air cylinder, a rail car pipe starts to charge air, the pressure rises along with the balance air cylinder, when the pressure of the balance air cylinder rises to a fixed pressure (600 or 500 kpa), a flow sensor between a relay valve and a braking pipe detects the total air charging flow MX in a relieving period, the braking system closes the relay valve air supply when the rail car is long (the secondary air cylinder of the rail car needs to be charged), the rail car pipe continues to charge air, the pressure rises, and when PJ = PL (namely, PJ-PL = PL <10 kpa) or the fluctuation value of the rail car main pipe pressure fluctuation is detected to be <10kpa, the air charging time counter stops time (at this time, namely, the total air charging flow is TC.
Through the detection, the air charging time, the air discharging time, the main pipe air pressure leakage amount and the total air charging flow of the rail car are obtained, the air charging and discharging standard time is stored in the monitoring device according to a cargo/passenger rail car air charging and discharging time reference table, and the air charging standard flow value is stored in the monitoring device according to a cargo/passenger rail car air charging flow reference table. And comparing the detected charging time, discharging time, main pipe wind pressure leakage quantity and charging total flow quantity with the range specified by the standard, and if the detected charging time, discharging time, main pipe wind pressure leakage quantity and charging total flow quantity are beyond the specified range, sending out a danger alarm.
After static detection and pressure maintaining are carried out for 1 minute, if the leakage rate of the wind pressure of the main pipe of the rail car is more than 20kpa/m, alarm prompt is carried out; monitoring the wind pressure fluctuation condition of a main pipe of the railway vehicle in real time during operation, and giving an alarm prompt when the wind pressure leakage quantity of the main pipe of the railway vehicle is more than 20 KPA; the braking decompression amount and the air exhaust time exceed the standard time to alarm in the running process of the rail car; in the running process of the rail car, warning when the relief time exceeds the standard time after the pressure reduction amount is braked; and the railcar gives an alarm when the air charging and relieving time of the penetration test in the multi-vehicle coupling state exceeds the standard.
The invention provides a railway vehicle brake monitoring device, which mainly comprises the following working processes: testing and storing volume data of locomotive and vehicle brake pipe → measuring the data conversion equivalent of air charging and air discharging relative pressure, flow and time → establishing database → converting marshalling train type and vehicle number information obtained on line → comparing with the pressure and flow of brake test and brake release and air charging and discharging → alarming if abnormal.
The monitoring device obtains the locomotive type (truck/passenger car) and the vehicle value from the TAX box (or the rail car GYK device) through an RS-422 (or RS-485) interface.
The display content of the display interface is as follows:
decompression amount =50KPa (or 70KPa, 140/170 KPa)
Air exhaust time = xxx seconds standard air exhaust = xxx seconds air exhaust time difference = xxx seconds
Standard air charge time = xxx seconds air charge time difference = xxx seconds
Air flow = xxxm 3 Standard/min air flow = xxxm 3 /min
Difference in aeration flow = xxxm 3 /min
Leakage = xxxKPa standard leakage less than or equal to 20KPa leakage difference = xxxKPa
Other descriptions:
(1) decompression command output
When K1 (or K2 and K3) is pressed down, the monitoring device outputs 110VDC voltage through the relay;
(2) pressure maintaining instruction output
When the pressure maintaining command is sent out, the monitoring device outputs 110VDC voltage through the relay;
(3) pressure difference a
Differential pressure a = PJ-PL is <10 KPa;
(4) equalizing reservoir pressure PJ
PJ comes from the pressure sensor of the equalizing reservoir, the pressure sensor is installed on the equalizing reservoir of the locomotive, after the air exhaust instruction is issued, the monitoring device of the brake system firstly samples the pressure PJ0 of the equalizing reservoir, then sends out a 'pressure reduction instruction', the air exhaust time counter starts to time, the pressure of the equalizing reservoir firstly drops, the air exhaust valve port of the relay valve is opened therewith, the pressure of the rail car pipe drops therewith, and the pressure sensor can detect the data of the pressure change of the equalizing reservoir in real time. The pressure range is 0 to 950kPa. The rated voltage is: 15V. The A/D analog-to-digital conversion outputs 3-20 mA.
(5) Railcar tube pressure PL
PL comes from rail car pipe pressure sensor, and pressure sensor installs on the locomotive brake pipe, and the locomotive brake pipe is through flexible connection, under the condition that locomotive and vehicle brake pipe dog-ear cock are opened, perceives rail car brake pipe pressure variation situation at any time, when the driver tries to brake or the rail car moves speed governing and brake the parking, brake pipe pressure all will change, and pressure sensor can detect the data of its pressure variation's size in real time.
The pressure is in the range of 0 to 950kPa. The rated voltage is: 15V. The A/D analog-to-digital conversion outputs 4-20 mA.
(6) MX comes from flow sensor between relay valve and brake pipe
The flow sensor is installed between a relay valve of a locomotive brake and a locomotive brake pipe in series, the flow of air charging and air discharging of the railway vehicle brake pipe is monitored and recorded at any time, when a driver tries to brake or the railway vehicle adjusts speed and brakes and stops in operation, the pressure of the brake pipe changes, and the flow sensor can detect the changed flow data in real time. The pressure range is 0 to 950kPa. The rated voltage is: 15V. The A/D analog-to-digital conversion outputs 3-25 mA.
The monitoring host computer comprises power integrated circuit board + master control integrated circuit board, and the master control integrated circuit board includes: the system comprises a main control CPU, a sensor, various communication circuits and the like, wherein the power supply of the sensor is realized, and the output signal of the sensor is acquired.
Selecting a type of the CPU: an STM32F4XX series ARM chip is selected.
1) The more advanced kernel, STM32F4, employs the CortexM4 kernel with the FPU and DSP instruction sets, while STM32FI employs the CortexM3 kernel without the FPU and DSP instruction sets.
2) More resources, STM32F4 has on-chip SRAM up to 192KB, with camera interface (DCMI), crypto processor (crypt), USB high-speed OTG, true random number generator, OTP memory, etc.
3) For the same peripheral part, the STM32F4 has faster analog-to-digital conversion speed, lower ADC/DAC working voltage, a 32-bit timer, a real-time clock (RTC) with a calendar function, greatly enhanced IO multiplexing function, 4K bytes of battery backup SRAM and faster USART and SPI communication speed.
4) Higher performance, the highest running frequency of STM32F4 can reach 168Mhz, and STM32FI can only reach 72Mhz; the STM32F4 has an ART self-adaptive real-time accelerator, the performance equivalent to the zero waiting period of FLASH can be achieved, the STM32FI needs the waiting period, and the FSMC of the STM32F4 adopts a 32-bit multi-AHB bus matrix, so that the access speed is obviously improved compared with the STM32FI bus.
5) Lower power consumption. The power consumption of STM32F40x is: 238uA/Mhz, where the lower power version of STM32F40I is much lower: l40uA/Mhz, while STM32FI is up to 421uA/Mhz.
The chip of the sensor adopts an isolation amplifier T1443P chip, and if a standard current signal output by the sensor needs to be added with a precision resistor to be converted into a voltage signal.
With respect to the definition of the monitoring host interface, table 1 is defined for the monitoring host GX7 port pins, as shown in table 1:
table 1: monitoring device host GX7 port pin definition
Regarding the monitor display, the external dimensions of the display are: length, width, height =140, 180, 65 (mm); the display interface definition is shown in table 2.
Table 2: display GX7 Port Pin definition
According to the invention, the pressure sensors are arranged in the main braking pipe and the balance air cylinder of the rail car, the flow sensor is arranged between the relay valve and the main braking pipe of the rail car, the air charging time, the air discharging time, the total air charging flow and the leakage are measured in the air charging, air discharging and pressure maintaining stages of the braking process of the rail car by means of the measured data of the sensors, and whether the potential safety hazard exists in the braking process of the rail car is judged according to the measurement result, so that the whole process is objective and reliable, and the rail car accident caused by improper manual inspection in the prior art is avoided.
The embodiments in the present description 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.
The principle and the embodiment of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (2)
1. A method for monitoring a braking process of a railway vehicle is characterized in that the method is applied to a monitoring device for the braking process of the railway vehicle, and the monitoring device comprises: the system comprises a first pressure sensor, a second pressure sensor, a flow sensor and a monitoring host, wherein the first pressure sensor is arranged in a balance air cylinder of the rail car, the second pressure sensor is arranged in a brake main pipe of the rail car, and the flow sensor is arranged between a relay valve and the brake main pipe of the rail car; the monitoring host is used for collecting pressure values measured by the first pressure sensor and the second pressure sensor and flow values measured by the flow sensors, determining air exhaust time, air charging time, main pipe air pressure leakage and total air charging flow in the braking process of the rail car according to the pressure values and the flow values, and giving an alarm when the air exhaust time, the air charging time, the main pipe air pressure leakage and the total air charging flow exceed a set range;
the rail car braking process monitoring method comprises the following steps:
in the process of braking and exhausting of the rail car, determining the exhaust time of the rail car;
determining the air pressure leakage amount of the main braking pipe of the rail car in the process of braking and pressure maintaining of the rail car;
determining the air charging time and the total air charging flow of the rail car in the braking and air charging process of the rail car;
judging whether the air exhaust time is within the range set by the standard air exhaust time;
if not, an alarm of abnormal air exhaust time is given;
judging whether the leakage amount is within a range set by a standard leakage amount or not;
if the leakage amount is not in the range set by the standard leakage amount, an alarm of abnormal leakage amount is sent out;
judging whether the air charging time is within a range set by standard air charging time;
if the charging time is not within the range set by the standard charging time, an alarm of abnormal charging time is given;
judging whether the total air charging flow is in a range set by a standard total air charging flow;
if the total charging air flow is not in the range set by the standard total charging air flow, an alarm of abnormal total charging air flow is given;
in the process of braking and exhausting of the rail car, the exhaust time of the rail car is determined, and the method specifically comprises the following steps:
timing the air exhaust time when the braking air exhaust process of the rail car starts;
collecting the pressure value inside the equalizing air cylinder in real time;
collecting the pressure value in the brake main pipe in real time;
when the pressure value in the equalizing air cylinder is equal to the pressure value in the brake main pipe, stopping timing the air exhaust time to obtain the air exhaust time;
the braking pressurize in-process of railcar confirms the leakage quantity of wind pressure of railcar braking person in charge specifically includes:
when the pressure value in the equalizing air cylinder is equal to the pressure value in the braking main pipe, entering the braking pressure maintaining process of the rail car; starting to time the pressure maintaining time;
when the pressure maintaining time begins to be counted, collecting an internal pressure value of the brake main pipe, and recording the internal pressure value as a first pressure value;
when the pressure maintaining time reaches the set time, acquiring an internal pressure value of the brake main pipe, and recording the internal pressure value as a second pressure value;
the first pressure value and the second pressure value are subjected to difference to obtain the wind pressure leakage amount of the brake main pipe;
in the braking and air charging process of the rail car, determining the air charging time and the total air charging flow of the rail car, and specifically comprising the following steps:
when the braking of the rail car enters the air charging process, starting to time the air charging time;
collecting the pressure value in the equalizing air cylinder in real time;
collecting the pressure value in the brake main pipe in real time;
when the pressure value in the equalizing air cylinder reaches 600kpa or 500kpa, collecting a flow value measured by the flow sensor, and recording the flow value as total air charging flow;
when the pressure value inside the equalizing air cylinder is equal to the pressure value inside the brake main pipe, stopping timing the air charging time to obtain the air charging time;
and when the pressure fluctuation value in the main pipe of the railway vehicle is less than 10kpa, stopping timing the air charging time to obtain the air charging time.
2. The method of claim 1, wherein the set time is one minute.
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| CN112124277B (en) * | 2020-09-27 | 2021-11-16 | 中车唐山机车车辆有限公司 | Rail vehicle brake cylinder pressure control method and device and rail vehicle |
| CN112326278A (en) * | 2020-11-06 | 2021-02-05 | 大秦铁路股份有限公司科学技术研究所 | Through test method for train pipe based on wireless reconnection mode |
| CN112622864B (en) * | 2021-01-05 | 2022-02-11 | 株洲中车时代电气股份有限公司 | Train and state detection method and system of train pipe thereof |
| CN113525331B (en) * | 2021-08-09 | 2022-07-05 | 卡斯柯信号有限公司 | Automatic brake pipe detection method and system based on vehicle-mounted equipment |
| CN113696866B (en) * | 2021-09-29 | 2022-05-17 | 中车大连机车研究所有限公司 | Automatic driving air brake application method for heavy-duty locomotive in long and steep downhill scene |
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