CN115534920A - Method and device for determining pressure of brake air cylinder of motor train unit - Google Patents

Method and device for determining pressure of brake air cylinder of motor train unit Download PDF

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Publication number
CN115534920A
CN115534920A CN202211315854.XA CN202211315854A CN115534920A CN 115534920 A CN115534920 A CN 115534920A CN 202211315854 A CN202211315854 A CN 202211315854A CN 115534920 A CN115534920 A CN 115534920A
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China
Prior art keywords
air cylinder
pressure
value
sensor
brake
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CN202211315854.XA
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Chinese (zh)
Inventor
王鹏
章阳
韩朝霞
蔡田
温熙圆
程宏明
安志鹏
齐政亮
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China Academy of Railway Sciences Corp Ltd CARS
Locomotive and Car Research Institute of CARS
Beijing Zongheng Electromechanical Technology Co Ltd
Tieke Aspect Tianjin Technology Development Co Ltd
Original Assignee
China Academy of Railway Sciences Corp Ltd CARS
Locomotive and Car Research Institute of CARS
Beijing Zongheng Electromechanical Technology Co Ltd
Tieke Aspect Tianjin Technology Development Co Ltd
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Priority to CN202211315854.XA priority Critical patent/CN115534920A/en
Publication of CN115534920A publication Critical patent/CN115534920A/en
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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
    • B60T17/228—Devices for monitoring or checking brake systems; Signal devices for railway vehicles
    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
    • 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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
    • 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
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/40—Failsafe aspects of brake control systems
    • B60T2270/406—Test-mode; Self-diagnosis

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The invention provides a method and a device for determining the pressure of a brake air cylinder of a motor train unit, wherein the method comprises the following steps: acquiring real-time data of a brake air cylinder pressure sensor, and determining a sensor state result according to the real-time data of the brake air cylinder pressure sensor; if the state result of the sensor is that pressure value estimation is needed, respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time to obtain a real-time pre-control pressure rising value; and determining the estimated value of the pressure of the brake air cylinder by utilizing the real-time pre-control pressure rising value according to the corresponding relation between the pre-control pressure rising value and the air cylinder pressure value which are measured in advance. According to the invention, the hysteresis characteristic of pressure change of the brake cylinder is utilized, and the action of the electromagnetic valve is controlled, so that the pressure value of the brake air cylinder is determined without depending on a sensor, the pressure value of the brake air cylinder is more comprehensively diagnosed, the judgment of common faults is realized, the pressure diagnosis requirement of the brake air cylinder is met, and the accuracy, comprehensiveness and usability of pressure value diagnosis are improved.

Description

Method and device for determining pressure of brake air cylinder of motor train unit
Technical Field
The invention relates to the technical field of brake air cylinders of motor train units, in particular to a method and a device for determining the pressure of the brake air cylinder of the motor train unit.
Background
The brake air cylinder of the motor train unit directly provides compressed air for the friction brake system driven by the pneumatic component, and the pressure value of the compressed air cylinder has direct influence on effective implementation of friction brake energy. An excessively low brake reservoir pressure value may cause the friction brakes to apply too slowly or not to apply, and an excessively high pressure value may reduce the efficiency of control of the friction brakes and increase energy consumption. Therefore, at present, each type of motor train unit is provided with a brake air cylinder pressure sensor, and the physical pressure value is converted into a voltage signal or a current signal, and the voltage signal or the current signal is converted into digital quantity through an AD converter of the electronic brake control unit MCU to perform online calculation and diagnosis of the pressure value.
At present, the calculation of the pressure value of the brake air cylinder is realized by adopting a linear transformation mode, namely the pressure value of the brake air cylinder in software is equal to a value obtained after A/D conversion, multiplied by a linear transformation slope and added with a linear transformation intercept. The existing diagnosis method mainly takes range judgment as a main part, if the value after A/D conversion is used for calculating the original current value of the sensor according to the corresponding relation, and when the current value is out of the range of 4-20mA, a fault is reported; or when the calculated pressure value is smaller than a certain standard, the pressure of the brake air cylinder is considered to be incapable of meeting the friction braking requirement, and an unavailable fault is reported; the methods realize the diagnosis of the pressure of the brake air cylinder to a certain extent, but the method still cannot make effective judgment on the abnormal phenomenon in the actual vehicle application. If the actual pressure of a brake air cylinder is too high due to the fact that the air compressor is not stopped, friction braking can still be supported, and faults are reported due to the fact that the current value of the sensor exceeds the limit; or when the pressure value caused by the abnormal sensor is constant for a long time, the actual pressure value can not be determined, and the difference between the 'constant' pressure value and the actual constant pressure value under the low-pressure steady state is difficult to distinguish; in addition, in practical use, abnormal fluctuation of the pressure value due to sensor value drift or electromagnetic interference often occurs. Although intelligent diagnosis methods such as wavelet analysis, neural networks, support vector machines and the like have certain application in the aspect of sensor fault diagnosis, the methods are difficult to build trees in online application in consideration of objective requirements such as processing capacity and application safety of an actual vehicle MCU.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention mainly aims to provide a method and a device for determining the pressure of a brake air cylinder of a motor train unit, so that the pressure value of the brake air cylinder is determined without depending on a sensor, and the requirement of diagnosing the pressure of the brake air cylinder of the motor train unit in the future is met.
In order to achieve the above object, an embodiment of the present invention provides a method for determining pressure of a brake reservoir of a motor train unit, where the method includes:
acquiring real-time data of a brake air cylinder pressure sensor, and determining a sensor state result according to the real-time data of the brake air cylinder pressure sensor;
if the state result of the sensor is that pressure value estimation is needed, respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time to obtain a real-time pre-control pressure rising value;
and determining the estimated value of the pressure of the brake air cylinder by utilizing the real-time pre-control pressure rising value according to the corresponding relation between the pre-control pressure rising value and the air cylinder pressure value which are measured in advance.
Optionally, in an embodiment of the present invention, acquiring real-time data of the brake cylinder pressure sensor, and determining a sensor state result according to the real-time data of the brake cylinder pressure sensor includes:
acquiring a real-time brake air cylinder pressure value and corresponding constant time thereof, and determining a sensor fault result according to a preset time threshold value and the real-time brake air cylinder pressure value;
and if the sensor fault result is that the sensor is in fault, determining that the sensor state result is that the pressure value estimation needs to be carried out.
Optionally, in an embodiment of the present invention, the method further includes: and obtaining a fault early warning result of the brake air cylinder pressure sensor according to the estimated value of the brake air cylinder pressure and the real-time brake air cylinder pressure value.
Optionally, in an embodiment of the present invention, if the state result of the sensor indicates that the pressure value estimation is required, respectively controlling the opening of the air charging valve and the air discharging valve in the electromagnetic valve according to a preset valve start time includes:
if the state result of the sensor is that the pressure value estimation is needed, determining the current working condition of the brake air cylinder;
and if the current working condition of the brake air cylinder is known to be a non-braking working condition or a pure electric braking working condition, respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time.
Optionally, in an embodiment of the present invention, the corresponding relationship between the pre-control pressure increase value and the reservoir pressure value is obtained as follows:
determining a plurality of air cylinder pressure values according to the preset interval value and the preset pressure range;
under different air cylinder pressure values, respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time to obtain pre-control pressure rising values corresponding to the air cylinder pressure values;
and determining the corresponding relation between the pre-control pressure rising value and the air reservoir pressure value according to the pre-control pressure rising value corresponding to each air reservoir pressure value.
The embodiment of the invention also provides a device for determining the pressure of the brake air cylinder of the motor train unit, which comprises the following components:
the sensor state module is used for acquiring real-time data of the brake air cylinder pressure sensor and determining a sensor state result according to the real-time data of the brake air cylinder pressure sensor;
the pressure rise value module is used for respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time to obtain a real-time pre-control pressure rise value if the state result of the sensor is that pressure value estimation is required;
and the pressure estimation value module is used for determining a braking air cylinder pressure estimation value by utilizing the real-time pre-control pressure rising value according to the corresponding relation between the pre-control pressure rising value and the air cylinder pressure value which are measured in advance.
Optionally, in an embodiment of the present invention, the sensor status module includes:
the sensor fault unit is used for acquiring a real-time brake air cylinder pressure value and corresponding constant time thereof, and determining a sensor fault result according to a preset time threshold value and the real-time brake air cylinder pressure value;
and the sensor state unit is used for determining that the sensor state result is the pressure value estimation needed if the sensor fault result is that the sensor is in fault.
Optionally, in an embodiment of the present invention, the apparatus further includes: and the fault early warning module is used for obtaining a fault early warning result of the brake air cylinder pressure sensor according to the brake air cylinder pressure estimated value and the real-time brake air cylinder pressure value.
Optionally, in an embodiment of the present invention, the pressure increase module includes:
the air cylinder working condition unit is used for determining the current working condition of the brake air cylinder if the state result of the sensor is that pressure value estimation is required;
and the valve starting unit is used for respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time if the current working condition of the brake air cylinder is a non-braking working condition or a pure electric braking working condition.
Optionally, in an embodiment of the present invention, the apparatus further includes:
the air cylinder pressure value module is used for determining a plurality of air cylinder pressure values according to the preset interval value and the preset pressure range;
the valve control module is used for respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time under different air cylinder pressure values to obtain pre-control pressure rising values corresponding to the air cylinder pressure values;
and the corresponding relation module is used for determining the corresponding relation between the pre-control pressure rising value and the air cylinder pressure value according to the pre-control pressure rising value corresponding to each air cylinder pressure value.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method when executing the program.
The present invention also provides a computer-readable storage medium having stored thereon a computer program for executing the above method.
The present invention also provides a computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the above method.
The method utilizes the hysteresis characteristic of the pressure change of the brake cylinder and combines the control of the action of the electromagnetic valve, realizes that the pressure value of the brake air cylinder is determined without depending on a sensor, diagnoses the pressure value of the brake air cylinder more comprehensively, realizes the judgment of common faults, judges whether the pressure sensor works normally or not, meets the requirement of the pressure diagnosis of the brake air cylinder of the motor train unit in the future, and improves the accuracy, comprehensiveness and usability of the pressure value diagnosis.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly introduced 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 based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a gas circuit of a motor train unit;
FIG. 2 is a flowchart of a method for determining the pressure of a brake reservoir of a motor train unit according to an embodiment of the invention;
FIG. 3 is a flow chart of a result of determining a state of a sensor in an embodiment of the present invention;
FIG. 4 is a flow chart of valve opening control according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating obtaining a corresponding relationship according to an embodiment of the present invention;
FIG. 6 is a flow chart of friction brake application and mitigation under non-emergency braking in an embodiment of the present invention;
FIG. 7 is a flow chart illustrating a calculation of a pressure value estimation method according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating the operation of a diagnostic method in an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a brake reservoir pressure determining device of a motor train unit according to an embodiment of the invention;
FIG. 10 is a schematic diagram of a sensor status module according to an embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a brake cylinder pressure determining device of a motor train unit according to another embodiment of the invention;
FIG. 12 is a schematic diagram of a pressure rise module according to an embodiment of the present invention;
FIG. 13 is a schematic structural diagram of a brake reservoir pressure determination device of a motor train unit according to still another embodiment of the present invention;
fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method and a device for determining pressure of a brake air cylinder of a motor train unit.
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.
As shown in fig. 1, which is a schematic diagram of a part of air circuits of a certain conventional motor train unit, compressed air in a brake reservoir flows into a brake control module through a pipeline from a direction of an arrow at the lower left in the diagram, and provides an air source for brake pilot control pressure control of an electromagnetic valve (04 module in the diagram, in a dashed line frame) of an EP (electro pneumatic switching valve) and pressure conversion of a relay valve (13 module in the diagram, lower right corner). In fig. 15, a brake reservoir pressure sensor is shown, and since the compressed air is directly supplied to the relay valve R port, the brake reservoir pressure is also referred to as R pressure.
When the train applies friction braking under the non-emergency braking condition, an air charging valve 1 and an air discharging valve 2 in the EP electromagnetic valve 04 are opened and closed, the R pressure is taken as a source, the input pressure (measured by a Cv pressure sensor of 01) of a Cv port of a relay valve in the figure is adjusted to be set pre-control pressure, and meanwhile the R pressure is also taken as a source by the relay valve. According to the input pressure of the Cv port, the pressure which corresponds to the ratio and is amplified in flow is output from the C port and is used by the brake cylinder. The normal range of R pressure values for a typical train is between 550kpa and 1000 kpa. When the R pressure is too small, the Cv pressure can reach the set value after the EP solenoid valve 04 needs to be opened for a long time, and the adjustment time affecting the C pressure value is also increased; when the R pressure value is too large, the control overshoot of the EP electromagnetic valve 04 is easily caused, so that the electromagnetic valve frequently acts, and the control instability and the energy consumption are increased.
In fig. 1, 03 is an emergency solenoid valve, and when the brake is not applied to an emergency brake, the Cv1 pressure sensor value of the pressure sensor 3 and the Cv pressure sensor value of 01 in the EP solenoid valve 04 are substantially the same. The brake reservoir pressure sensor 15 typically converts the pressure to a 4 to 20ma current signal that is transmitted to the electronic brake control system MCU for use by the control/diagnostic system after 10 to 12 bit AD conversion.
As shown in fig. 2, a flowchart of a method for determining a brake reservoir pressure of a motor train unit according to an embodiment of the present invention is shown, and an execution subject of the method for determining the brake reservoir pressure of the motor train unit according to the embodiment of the present invention includes, but is not limited to, a computer. The method utilizes the hysteresis characteristic of the pressure change of the brake cylinder and combines the control of the action of the electromagnetic valve, realizes that the pressure value of the brake air cylinder is determined without depending on a sensor, diagnoses the pressure value of the brake air cylinder more comprehensively, realizes the judgment of common faults, judges whether the pressure sensor works normally or not, meets the requirement of the pressure diagnosis of the brake air cylinder of the motor train unit in the future, and improves the accuracy, comprehensiveness and usability of the pressure value diagnosis. The method shown in the figure comprises the following steps:
the method comprises the following steps of S1, acquiring real-time data of a brake air cylinder pressure sensor, and determining a sensor state result according to the real-time data of the brake air cylinder pressure sensor;
s2, if the state result of the sensor is that pressure value estimation is needed, respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time to obtain a real-time pre-control pressure rise value;
and S3, determining a braking air cylinder pressure estimated value by utilizing the real-time pre-control pressure rising value according to the corresponding relation between the pre-control pressure rising value and the air cylinder pressure value which are measured in advance.
The real-time data of the brake air cylinder pressure sensor can comprise a real-time pressure value of the brake air cylinder, corresponding constant time and the like, and the state of the sensor is determined according to the real-time data of the brake air cylinder pressure sensor. For example, if the fluctuation of the real-time pressure value of the brake reservoir exceeds a preset range, or the constant time corresponding to a specific real-time pressure value is too long, it can be determined that the current sensor has a fault or the pressure value needs to be calibrated, and the state result of the sensor is determined to be that the pressure value needs to be estimated. And if the real-time data of the brake air cylinder is not abnormal, determining that the pressure value estimation is not needed to be carried out on the sensor state result.
Further, except for the condition that the sensor breaks down, daily sensor calibration processing can be carried out through manual judgment or according to preset time, or when fluctuation of real-time data of the brake cylinder pressure sensor exceeding a preset range occurs, the sensor can be determined to need to be calibrated, and then pressure value estimation is carried out.
Specifically, taking the case that the sensor fails, the sensor is used to obtain a real-time pressure value of the brake air cylinder, that is, a real-time brake air cylinder pressure value, and if the real-time brake air cylinder pressure value is continuously unchanged, the time that the real-time brake air cylinder pressure value is continuously unchanged is timed, so that the constant time corresponding to the real-time brake air cylinder pressure value is obtained.
Further, the constant time is compared with a preset time threshold, and if the constant time exceeds the preset time threshold, for example, the constant time exceeds 1min, it is considered that the sensor is faulty, that is, the generated sensor fault result is faulty, and thus it is determined that the sensor state result is that pressure value estimation needs to be performed. On the contrary, if the constant time does not exceed the preset time threshold, the sensor is considered to be not failed, that is, the generated sensor failure result is that no failure occurs, and therefore the sensor state result is determined to be that pressure value estimation is not needed.
Further, if the state result of the sensor is that the pressure value estimation is needed, the air charging valve and the air discharging valve in the electromagnetic valve are controlled according to preset valve starting time, namely the air charging valve opening time and the air discharging valve opening time. Specifically, under different brake air cylinder pressure values, after valve control is performed according to preset valve starting time, the pre-control pressure rise value is fixed.
Specifically, after valve start control is performed according to the opening time of the charging valve and the opening time of the exhaust valve, a pre-control pressure rise value is obtained, and a corresponding braking air cylinder pressure estimated value is determined by using the corresponding relation between the pre-control pressure rise value and the air cylinder pressure value.
As an embodiment of the present invention, as shown in fig. 3, acquiring real-time data of the brake cylinder pressure sensor, and determining a sensor status result according to the real-time data of the brake cylinder pressure sensor includes:
step S21, acquiring a real-time brake air cylinder pressure value and corresponding constant time, and determining a sensor fault result according to a preset time threshold and the real-time brake air cylinder pressure value;
and S22, if the sensor fault result is that the sensor is in fault, determining that the sensor state result is that pressure value estimation is required.
In this embodiment, the method further includes: and obtaining a fault early warning result of the brake air cylinder pressure sensor according to the estimated value of the brake air cylinder pressure and the real-time brake air cylinder pressure value.
And comparing the estimated value of the pressure of the brake air cylinder with the real-time pressure value of the brake air cylinder, and if the absolute value of the difference value between the estimated value of the pressure of the brake air cylinder and the real-time pressure value of the brake air cylinder exceeds a preset threshold value, for example, the preset threshold value is 5kPa, the brake air cylinder is considered to be in fault, namely the generated fault early warning result of the pressure sensor of the brake air cylinder is in fault, and the state result of the sensor is determined to be the pressure value estimation required. And if the absolute value of the difference value between the two values does not exceed the preset threshold value, the brake air cylinder is considered to have no fault, namely the generated fault early warning result of the brake air cylinder pressure sensor is that no fault occurs, and therefore the condition result of the sensor is determined to be that pressure value estimation is not needed.
As an embodiment of the present invention, as shown in fig. 4, if the state result of the sensor indicates that pressure value estimation is required, respectively controlling the opening of the charging valve and the discharging valve in the electromagnetic valve according to the preset valve start time includes:
step S31, if the state result of the sensor is that pressure value estimation is needed, determining the current working condition of the brake air cylinder;
and step S32, if the current working condition of the brake air cylinder is known to be a non-braking working condition or a pure electric braking working condition, respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time.
If the state result of the sensor is that pressure value estimation is needed, for example, the fault result of the sensor is that a fault occurs, the current working condition of the brake air cylinder is determined before the valve is started and controlled. And if the current working condition of the brake air cylinder is a non-braking working condition or a pure electric braking working condition, respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time. On the contrary, if the current working condition is not the non-braking working condition or the pure electric braking working condition, the valve starting control cannot be carried out.
As an embodiment of the present invention, as shown in fig. 5, the correspondence between the pre-control pressure rise value and the reservoir pressure value is obtained by:
step S41, determining a plurality of air cylinder pressure values according to a preset interval value and a preset pressure range;
step S42, under different air cylinder pressure values, respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time to obtain pre-control pressure rising values corresponding to the air cylinder pressure values;
and S43, determining the corresponding relation between the pre-control pressure rising value and the air cylinder pressure value according to the pre-control pressure rising value corresponding to each air cylinder pressure value.
In this embodiment, the present invention is to estimate a pressure value of a brake cylinder without depending on a value of a brake cylinder pressure sensor, diagnose the pressure value based on the estimation result, and perform an early warning on a possible failure of the brake cylinder pressure sensor. The method comprises the following specific steps: still taking fig. 1 as an example for explanation, when the pneumatic structure is unchanged and the Cv1 pressure is 0, the rise values of the Cv1/Cv pressures are different after the charging valve in the EP solenoid valve is opened for a certain time under different brake reservoir R pressure values, the invention estimates the R pressure value by using the Cv1/Cv pressure rise value, and makes { R pressure value be equal to 0 ,r 1 ,...,r n To satisfy r 0 ＞550kpa，r n < 1000kpa, and r i -r j R pressure value sequence of = s (0 ≦ j < i ≦ n, i-j = 1), where s is any adjacent R i And r j The pressure difference between them, e.g. s, may take 5kpa. When the R pressure value is R k When the valve is opened, the charging valve in the EP electromagnetic valve is controlled to open t 0 Closing after time to raise Cv1 pressure by p k kpa, order { r 0 ,r 1 ,...,r n Cv1 pressure rise value obtained after the above method was carried out was { pcv1 } 0 ,pcv1 1 ,...,pcv1 n }. Then for anyPcv1 of s Satisfies the condition of pcv1 q ＜pcv1 s ＜pcv1 p And is and
Figure BDA0003909236310000081
pcv1 q 、pcv1 p ∈{pcv1 0 ,pcv1 1 ,...,pcv1 n p-q =1, corresponding to the value R of the R pressure s It can be estimated that:
Figure BDA0003909236310000082
and (2) determining the estimated value of the brake air cylinder pressure by utilizing the corresponding relation between the pre-control pressure rising value and the air cylinder pressure value represented by the formula (1).
In an embodiment of the present invention, as shown in fig. 6, fig. 7 and fig. 8, the working flows of the friction brake application and release process (based on fig. 1) under non-emergency braking, the pressure value estimation method calculation process and the diagnosis method are respectively described.
In this embodiment, the specific implementation manner of the present invention is divided into two parts, which are respectively testing and programming before leaving factory (i.e. determining the corresponding relationship between the pre-control pressure rise value and the reservoir pressure value), and estimating and diagnosing the brake reservoir pressure value when the train is in use.
The specific process for determining the corresponding relation between the pre-control pressure rising value and the air cylinder pressure value comprises the following steps:
(1) The same pneumatic system as that of the real vehicle is adopted, and the pressure of the brake air cylinder R is adjusted to be 550-1000 kpa at intervals of a certain pressure difference before each test. If the pressure difference is 5kpa, a total of 91 values is obtained.
(2) Under the current R pressure value, an air charging electromagnetic valve in the EP electromagnetic valve is controlled to be closed after being opened for a specified time (such as 10ms, specifically determined according to the characteristics of the EP electromagnetic valve), and the Cv1 pressure is exhausted after the air exhausting electromagnetic valve is opened for a specified time (such as 50ms, adjusted according to specific pressure reduction conditions) after waiting for a specified time (such as 500ms, and adjusted according to actual test conditions). The process is repeated for many times to obtain an average value, and Cv corresponding to all R pressure value sequences is obtained1 pressure rise value, i.e. the sequence pcv1 0 ,pcv1 1 ,...,pcv1 n And writing the data into brake control software.
The implementation process of the estimation and diagnosis of the pressure value of the brake air cylinder during the train running is as follows:
(1) Judging whether the pressure of the brake air cylinder needs to be estimated under the current working condition, and taking the constant pressure value of the brake air cylinder as an example for explanation: if the pressure value of the brake air cylinder is constant, a judgment standard can be set according to the current pressure value and the constant time, and if the constant time under a certain pressure value exceeds a set value, the pressure sensor is considered to be possibly broken down, and the pressure value needs to be estimated.
(2) And judging the working condition, and determining whether the current working condition meets the pressure value estimation of the brake air cylinder. When the train is in a non-braking or pure electric braking working condition, the pressure value of the brake air cylinder can be estimated.
(3) Starting to estimate the pressure value of the brake air cylinder, controlling the operation of the air charging valve and the air discharging valve in the EP electromagnetic valve according to the flow of the above content, and obtaining the Cv1 pressure rise value, namely the above-mentioned pcv1 s And simultaneously, verifying whether the Cv1 pressure value is collected normally by using the Cv pressure value change. According to the rise value pcv1 s And an existing sequence stored in the program, calculating a brake reservoir pressure estimate corresponding to the current rise value based on equation (1).
(4) And judging the state of the brake air cylinder pressure sensor and giving corresponding fault early warning according to the estimated value of the brake air cylinder pressure and a real-time pressure value given by the brake air cylinder pressure sensor.
The method for estimating the pressure value of the brake air cylinder does not depend on a pressure sensor, and the estimated pressure value can be used for checking the sampling value of the pressure sensor; on the basis, the pressure value of the brake air cylinder can be diagnosed more comprehensively, the static R pressure value in common faults and the judgment of electromagnetic interference and drift of the R pressure sensor are realized, and the accuracy, comprehensiveness and usability of pressure value diagnosis are improved.
The method for estimating the pressure value of the brake air cylinder is an online method, has better real-time performance, does not need to increase extra time and special working conditions in the estimation process, utilizes the self-checking process of electric braking and vehicle starting in the train brake application process, and has good economical efficiency.
In the estimation method, the hysteresis characteristic of the pressure change of the brake cylinder is utilized in the estimation process, the pressure of the brake cylinder is basically not influenced, and the related fault misinformation is avoided; the pressure value calculation method adopts indexes of other pressure change processes, adopts mutual verification of data of the Cv1 pressure sensor and the Cv pressure sensor, and has high reliability.
After the R pressure of the brake air cylinder is calculated in the estimation method provided by the invention, the brake control strategy can be adjusted according to the R pressure value, the action times of the EP electromagnetic valve when the pre-control pressure is adjusted are reduced, the response time of brake control and the energy consumption of a system are reduced, and the service life of the electromagnetic valve is prolonged.
Fig. 9 is a schematic structural diagram of a brake cylinder pressure determining device of a motor train unit according to an embodiment of the invention, wherein the device comprises:
the sensor state module 10 is used for acquiring real-time data of a brake air cylinder pressure sensor and determining a sensor state result according to the real-time data of the brake air cylinder pressure sensor;
the pressure rise value module 20 is used for respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time to obtain a real-time pre-control pressure rise value if the state result of the sensor is that pressure value estimation is required;
and the pressure estimation value module 30 is configured to determine a braking air cylinder pressure estimation value by using the real-time pre-control pressure increase value according to a corresponding relationship between the pre-control pressure increase value and the air cylinder pressure value measured in advance.
As an embodiment of the present invention, as shown in fig. 10, the sensor status module 10 includes:
the sensor fault unit 11 is used for acquiring a real-time brake air cylinder pressure value and corresponding constant time thereof, and determining a sensor fault result according to a preset time threshold value and the real-time brake air cylinder pressure value;
and the sensor state unit 12 is used for determining that the sensor state result is that pressure value estimation is required if the sensor fault result is that a fault occurs.
In this embodiment, as shown in fig. 11, the apparatus further includes: and the fault early warning module 40 is used for obtaining a fault early warning result of the brake air cylinder pressure sensor according to the estimated value of the brake air cylinder pressure and the real-time brake air cylinder pressure value.
As an embodiment of the present invention, as shown in fig. 12, the pressure rise value module 20 includes:
the air cylinder working condition unit 21 is used for determining the current working condition of the brake air cylinder if the state result of the sensor is that pressure value estimation is required;
and the valve starting unit 22 is used for respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time if the current working condition of the brake air cylinder is a non-braking working condition or a pure electric braking working condition.
As an embodiment of the present invention, as shown in fig. 13, the apparatus further includes:
the air cylinder pressure value module 50 is used for determining a plurality of air cylinder pressure values according to a preset interval value and a preset pressure range;
the valve control module 60 is used for respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time under different air cylinder pressure values to obtain pre-control pressure rising values corresponding to the air cylinder pressure values;
the corresponding relation module 70 is configured to determine a corresponding relation between the pre-control pressure increase value and the reservoir pressure value according to the pre-control pressure increase value corresponding to each reservoir pressure value.
The invention further provides a device for determining the pressure of the brake air cylinder of the motor train unit based on the application concept same as the method for determining the pressure of the brake air cylinder of the motor train unit. The principle of solving the problems of the device for determining the pressure of the brake air cylinder of the motor train unit is similar to that of the method for determining the pressure of the brake air cylinder of the motor train unit, so the implementation of the device for determining the pressure of the brake air cylinder of the motor train unit can refer to the implementation of the method for determining the pressure of the brake air cylinder of the motor train unit, and repeated parts are not repeated.
The method utilizes the hysteresis characteristic of the pressure change of the brake cylinder and combines the control of the action of the electromagnetic valve, realizes that the pressure value of the brake air cylinder is determined without depending on a sensor, diagnoses the pressure value of the brake air cylinder more comprehensively, realizes the judgment of common faults, judges whether the pressure sensor works normally or not, meets the requirement of the pressure diagnosis of the brake air cylinder of the motor train unit in the future, and improves the accuracy, comprehensiveness and usability of the pressure value diagnosis.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method when executing the program.
The invention also provides a computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the above method.
The present invention also provides a computer-readable storage medium storing a computer program for executing the above method.
As shown in fig. 14, the electronic device 600 may further include: communication module 110, input unit 120, audio processor 130, display 160, power supply 170. It is noted that the electronic device 600 does not necessarily include all of the components shown in fig. 14; furthermore, the electronic device 600 may also comprise components not shown in fig. 14, which may be referred to in the prior art.
As shown in fig. 14, the central processor 100, sometimes referred to as a controller or operational control, may include a microprocessor or other processor device and/or logic device, the central processor 100 receiving input and controlling the operation of the various components of the electronic device 600.
The memory 140 may be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The information relating to the failure may be stored, and a program for executing the information may be stored. And the central processing unit 100 may execute the program stored in the memory 140 to realize information storage or processing, etc.
The input unit 120 provides input to the cpu 100. The input unit 120 is, for example, a key or a touch input device. The power supply 170 is used to provide power to the electronic device 600. The display 160 is used to display an object to be displayed, such as an image or a character. The display may be, for example, an LCD display, but is not limited thereto.
The memory 140 may be a solid state memory such as Read Only Memory (ROM), random Access Memory (RAM), a SIM card, or the like. There may also be a memory that holds information even when power is off, can be selectively erased, and is provided with more data, an example of which is sometimes called an EPROM or the like. The memory 140 may also be some other type of device. Memory 140 includes buffer memory 141 (sometimes referred to as a buffer). The memory 140 may include an application/function storage section 142, and the application/function storage section 142 is used to store application programs and function programs or a flow for executing the operation of the electronic device 600 by the central processing unit 100.
The memory 140 may also include a data store 143, the data store 143 for storing data, such as contacts, digital data, pictures, sounds, and/or any other data used by the electronic device. The driver storage portion 144 of the memory 140 may include various drivers of the electronic device for communication functions and/or for performing other functions of the electronic device (e.g., messaging application, address book application, etc.).
The communication module 110 is a transmitter/receiver 110 that transmits and receives signals via an antenna 111. The communication module (transmitter/receiver) 110 is coupled to the central processor 100 to provide an input signal and receive an output signal, which may be the same as in the case of a conventional mobile communication terminal.
Based on different communication technologies, a plurality of communication modules 110, such as a cellular network module, a bluetooth module, and/or a wireless local area network module, etc., may be provided in the same electronic device. The communication module (transmitter/receiver) 110 is also coupled to a speaker 131 and a microphone 132 via an audio processor 130 to provide audio output via the speaker 131 and receive audio input from the microphone 132 to implement general telecommunications functions. Audio processor 130 may include any suitable buffers, decoders, amplifiers and so forth. In addition, an audio processor 130 is also coupled to the central processor 100, so that recording on the local can be enabled through a microphone 132, and so that sound stored on the local can be played through a speaker 131.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (13)

1. A method for determining the pressure of a brake air cylinder of a motor train unit is characterized by comprising the following steps:
acquiring real-time data of a brake air cylinder pressure sensor, and determining a sensor state result according to the real-time data of the brake air cylinder pressure sensor;
if the state result of the sensor is that pressure value estimation is needed, respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time to obtain a real-time pre-control pressure rising value;
and determining a braking air cylinder pressure estimated value by utilizing the real-time pre-control pressure rising value according to the corresponding relation between the pre-control pressure rising value and the air cylinder pressure value which are measured in advance.
2. The method of claim 1, wherein obtaining brake reservoir pressure sensor real-time data and determining a sensor status result from the brake reservoir pressure sensor real-time data comprises:
acquiring a real-time brake air cylinder pressure value and corresponding constant time thereof, and determining a sensor fault result according to a preset time threshold value and the real-time brake air cylinder pressure value;
and if the sensor fault result is that the sensor is in fault, determining that the sensor state result is that pressure value estimation is required.
3. The method of claim 2, further comprising: and obtaining a fault early warning result of the brake air cylinder pressure sensor according to the estimated value of the brake air cylinder pressure and the real-time brake air cylinder pressure value.
4. The method of claim 1, wherein if the sensor state result indicates that pressure value estimation is required, respectively controlling the opening of an air charging valve and an air discharging valve of an electromagnetic valve according to a preset valve starting time comprises:
if the state result of the sensor is that pressure value estimation is needed, determining the current working condition of the brake air cylinder;
and if the current working condition of the brake air cylinder is known to be a non-braking working condition or a pure electric braking working condition, respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time.
5. The method of claim 1, wherein the correspondence between the pre-control pressure rise value and the reservoir pressure value is obtained by:
determining a plurality of air cylinder pressure values according to the preset interval value and the preset pressure range;
under different air cylinder pressure values, respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time to obtain pre-control pressure rising values corresponding to the air cylinder pressure values;
and determining the corresponding relation between the pre-control pressure rising value and the air reservoir pressure value according to the pre-control pressure rising value corresponding to each air reservoir pressure value.
6. A EMUs brake reservoir pressure determination device, its characterized in that, the device includes:
the sensor state module is used for acquiring real-time data of the brake air cylinder pressure sensor and determining a sensor state result according to the real-time data of the brake air cylinder pressure sensor;
the pressure rise value module is used for respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time to obtain a real-time pre-control pressure rise value if the state result of the sensor is that pressure value estimation is required;
and the pressure estimation value module is used for determining a braking air cylinder pressure estimation value by utilizing the real-time pre-control pressure rising value according to the corresponding relation between the pre-control pressure rising value and the air cylinder pressure value which are measured in advance.
7. The apparatus of claim 6, wherein the sensor status module comprises:
the sensor fault unit is used for acquiring a real-time brake air cylinder pressure value and corresponding constant time thereof, and determining a sensor fault result according to a preset time threshold value and the real-time brake air cylinder pressure value;
and the sensor state unit is used for determining that the sensor state result is the pressure value estimation required if the sensor fault result is that a fault occurs.
8. The apparatus of claim 7, further comprising: and the fault early warning module is used for obtaining a fault early warning result of the brake air cylinder pressure sensor according to the estimated brake air cylinder pressure value and the real-time brake air cylinder pressure value.
9. The apparatus of claim 6, wherein the pressure rise value module comprises:
the air cylinder working condition unit is used for determining the current working condition of the brake air cylinder if the state result of the sensor is that pressure value estimation is required;
and the valve starting unit is used for respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time if the current working condition of the brake air cylinder is a non-braking working condition or a pure electric braking working condition.
10. The apparatus of claim 6, further comprising:
the air cylinder pressure value module is used for determining a plurality of air cylinder pressure values according to the preset interval value and the preset pressure range;
the valve control module is used for respectively controlling the opening of an air charging valve and an air discharging valve in the electromagnetic valve according to preset valve starting time under different air cylinder pressure values to obtain pre-control pressure rising values corresponding to the air cylinder pressure values;
and the corresponding relation module is used for determining the corresponding relation between the pre-control pressure rising value and the air cylinder pressure value according to the pre-control pressure rising value corresponding to each air cylinder pressure value.
11. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 5 when executing the computer program.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 5.
13. A computer program product comprising computer programs/instructions, characterized in that the computer programs/instructions, when executed by a processor, implement the steps of the method of any of claims 1 to 5.
CN202211315854.XA 2022-10-26 2022-10-26 Method and device for determining pressure of brake air cylinder of motor train unit Pending CN115534920A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211315854.XA CN115534920A (en) 2022-10-26 2022-10-26 Method and device for determining pressure of brake air cylinder of motor train unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211315854.XA CN115534920A (en) 2022-10-26 2022-10-26 Method and device for determining pressure of brake air cylinder of motor train unit

Publications (1)

Publication Number Publication Date
CN115534920A true CN115534920A (en) 2022-12-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211315854.XA Pending CN115534920A (en) 2022-10-26 2022-10-26 Method and device for determining pressure of brake air cylinder of motor train unit

Country Status (1)

Country Link
CN (1) CN115534920A (en)

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