CN113370949B - Rail vehicle brake cylinder pressure calculation method and system and brake control system - Google Patents

Rail vehicle brake cylinder pressure calculation method and system and brake control system Download PDF

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Publication number
CN113370949B
CN113370949B CN202110747825.XA CN202110747825A CN113370949B CN 113370949 B CN113370949 B CN 113370949B CN 202110747825 A CN202110747825 A CN 202110747825A CN 113370949 B CN113370949 B CN 113370949B
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brake cylinder
cylinder pressure
load
conversion coefficient
vehicle
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CN113370949A (en
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李龙
安震
李润华
聂振华
耿延龙
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CRRC Brake System Co Ltd
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CRRC Brake System Co Ltd
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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
    • 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
    • B60T8/1701—Braking or traction control means specially adapted for particular types of vehicles
    • B60T8/1705—Braking or traction control means specially adapted for particular types of vehicles for rail 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
    • 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
    • B61—RAILWAYS
    • B61H—BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES
    • B61H11/00—Applications or arrangements of braking or retarding apparatus not otherwise provided for; Combinations of apparatus of different kinds or types
    • B61H11/06—Applications or arrangements of braking or retarding apparatus not otherwise provided for; Combinations of apparatus of different kinds or types of hydrostatic, hydrodynamic, or aerodynamic brakes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Regulating Braking Force (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The application relates to a rail vehicle brake cylinder pressure calculation method, a rail vehicle brake cylinder pressure calculation system, a brake control system and a storage medium, wherein the method comprises the following steps: a data acquisition step, wherein load information and instruction information of the rail vehicle are acquired; an air braking force demand value obtaining step, namely calculating to obtain an air braking force demand value according to the instruction information and the electric braking force actual value, and/or directly calculating the air braking force demand value according to the instruction information; a step of obtaining a pressure conversion coefficient of the dynamic brake cylinder, wherein the pressure conversion coefficient of the dynamic brake cylinder is obtained through calculation according to the load information; and a brake cylinder pressure obtaining step of calculating an air brake force demand of the target vehicle according to the air brake force management method based on the air brake force demand, and further calculating to obtain a brake cylinder pressure of the target vehicle. According to the method and the device, the brake cylinder pressure is calculated through the dynamic brake cylinder pressure conversion coefficient obtained based on the vehicle load change, so that the brake cylinder pressure is calculated more flexibly and accurately.

Description

Rail vehicle brake cylinder pressure calculation method and system and brake control system
Technical Field
The application relates to the technical field of rail transit, in particular to a rail vehicle brake cylinder pressure calculation method, a rail vehicle brake cylinder pressure calculation system, a brake control system and an electronic device readable storage medium.
Background
The urban rail transit vehicle braking system is one of the key core systems of the subway vehicle, and the air braking system is a necessary component of the rail train braking system and is of great importance to the running safety of the train. Specifically, the present application primarily centers on one of the core algorithms of the air brake control system: a method for calculating a brake cylinder pressure of an air brake system.
At present, a brake cylinder pressure calculation method of a railway vehicle air brake control system usually calculates a total braking force demand value of a train according to train instructions and load information, then performs braking force management distribution according to an actual value of an electric braking force fed back by a traction system, and when the electric braking force value is insufficient or under a pure air braking condition, calculation and control of the air braking force are required. When the management calculation of the air braking force is carried out, firstly, a brake cylinder pressure conversion coefficient is calculated according to relevant technical parameters of a basic brake device of the vehicle, such as the number of brakes, transmission efficiency, clamping multiplying power, a friction coefficient and the like, and then, a corresponding brake cylinder pressure P is calculated according to the brake cylinder pressure conversion coefficient and the air braking force demand.
Since the technical parameters of the foundation brake system are fixed, the brake cylinder pressure conversion factor is usually calculated from these fixed parametersK FtoP Is a constant value. However, in practical use, the conversion coefficient of the brake cylinder pressureK FtoP Is influenced by the change of vehicle load, the same brake level under different loads, if the same brake cylinder pressure conversion coefficient is usedK FtoP To calculate the brake cylinder pressure, the vehicle deceleration can vary greatly.
Based on this, in practical application, a fixed brake cylinder pressure conversion coefficient is usedK FtoP The calculated brake cylinder pressure may make it difficult for the vehicle deceleration to meet the actual vehicle requirements for different load conditions.
Disclosure of Invention
The embodiment of the application provides a method and a system for calculating the pressure of a brake cylinder of a railway vehicle, a brake control system and a readable storage medium of electronic equipment, so that the pressure of the brake cylinder is calculated by obtaining a dynamic brake cylinder pressure conversion coefficient based on the load change of the vehicle, and the calculation of the pressure of the brake cylinder is more flexible and accurate.
In a first aspect, an embodiment of the present application provides a rail vehicle brake cylinder pressure calculation method, including:
the method comprises the steps of data acquisition, wherein load information and instruction information of the rail vehicle are acquired, and the instruction information comprises a braking instruction and braking level information;
an air braking force demand value obtaining step, namely calculating an air braking force demand value according to the instruction information and the electric braking force actual value, and/or directly calculating the air braking force demand value according to the instruction information under a pure air working condition;
a step of obtaining a pressure conversion coefficient of the dynamic brake cylinder, wherein the pressure conversion coefficient of the dynamic brake cylinder is obtained through calculation according to the load information;
and a brake cylinder pressure obtaining step of calculating an air braking force demand of a target vehicle according to an air braking force management method based on the air braking force demand, and calculating a brake cylinder pressure of the target vehicle according to the air braking force demand of the target vehicle and the dynamic brake cylinder pressure conversion coefficient.
In some embodiments, in the step of obtaining the dynamic brake cylinder pressure conversion coefficient, the dynamic brake cylinder pressure conversion coefficientK FtoP Calculated according to the following model:
Figure 268284DEST_PATH_IMAGE001
wherein, KAW3The conversion coefficient of brake cylinder pressure under overload (AW 3 load), KAW0Brake cylinder pressure conversion factor at no load (AW 0 load), W is current vehicle load, W isAW0No load, WAW3Is an overload.
In some embodiments, the step of obtaining the dynamic brake cylinder pressure conversion coefficient further comprises:
a load interval segmentation step, namely segmenting the interval of the relation between the brake cylinder pressure conversion coefficient and the vehicle load according to a preset vehicle load threshold;
a load section judgment step of judging a load section to which the current vehicle load of the target vehicle belongs according to the load information;
and calculating a dynamic brake cylinder pressure conversion coefficient, namely calculating the dynamic brake cylinder pressure conversion coefficient according to the load information and the load interval.
In some of these embodiments, the preset vehicle load threshold is full load.
In some embodiments, the step of calculating the dynamic brake cylinder pressure conversion coefficient further comprises:
when the current vehicle load is less than full load and greater than no load, the dynamic brake cylinder pressure conversion coefficientK FtoP Calculated according to the following model:
Figure 270875DEST_PATH_IMAGE002
wherein, KAW2The conversion factor of the brake cylinder pressure at full load (AW 2 load), KAW0Brake cylinder pressure conversion factor at no load (AW 0 load), W is current vehicle load, W isAW0No load (AW 0 load), WAW2Full load (AW 2 load).
In some embodiments, the step of calculating the dynamic brake cylinder pressure conversion coefficient further comprises:
the dynamic brake cylinder pressure conversion coefficient is used for controlling the brake cylinder pressure conversion coefficient when the current vehicle load is less than the overload load and greater than the full loadK FtoP Calculated according to the following model:
Figure 200785DEST_PATH_IMAGE003
wherein, KAW3The conversion coefficient of brake cylinder pressure under overload (AW 3 load), KAW2The brake cylinder pressure conversion coefficient at full load (AW 2 load), W is the current vehicle load, W is the brake cylinder pressure conversion coefficient at full loadAW2Full load (AW 2 load), WAW3Is an overload load (AW 3 load).
In a second aspect, an embodiment of the present application provides a brake cylinder pressure calculation system for a railway vehicle, which is configured to execute the brake cylinder pressure calculation method for a railway vehicle according to the first aspect, and includes:
the data acquisition module is used for acquiring load information and instruction information of the rail vehicle, wherein the instruction information comprises a braking instruction and braking level information;
the air braking force demand value acquisition module is used for calculating an air braking force demand value according to the instruction information and the electric braking force actual value and/or directly calculating the air braking force demand value according to the instruction information under the pure air working condition;
the dynamic brake cylinder pressure conversion coefficient acquisition module is used for calculating to obtain a dynamic brake cylinder pressure conversion coefficient according to the load information;
and the brake cylinder pressure acquisition module is used for calculating the air braking force demand of the target vehicle according to an air braking force management method based on the air braking force demand, and calculating the brake cylinder pressure of the target vehicle according to the air braking force demand of the target vehicle and the dynamic brake cylinder pressure conversion coefficient.
In some embodiments, the dynamic brake cylinder pressure conversion coefficient obtaining module further includes:
the load interval segmentation module is used for segmenting the interval of the relation between the brake cylinder pressure conversion coefficient and the vehicle load according to a preset vehicle load threshold;
the load interval judging module is used for judging a load interval to which the current vehicle load of the target vehicle belongs according to the load information;
and the dynamic brake cylinder pressure conversion coefficient calculation module is used for calculating the dynamic brake cylinder pressure conversion coefficient according to the load information and the load interval.
In a third aspect, the present embodiment provides a railway vehicle brake control system, and the railway vehicle brake control system executes the method for calculating the brake cylinder pressure of the railway vehicle according to the first aspect when calculating the air braking force.
In a fourth aspect, the present application provides an electronic device readable storage medium, on which a computer program is stored, which when executed by a processor implements the rail vehicle brake cylinder pressure calculation method according to the first aspect.
Compared with the related art, the rail vehicle brake cylinder pressure calculation method, the rail vehicle brake cylinder pressure calculation system, the brake control system and the readable storage medium of the electronic device provided by the embodiment of the application have the advantages that the brake cylinder pressure calculation is more flexible and accurate through providing the dynamic brake cylinder pressure conversion coefficient, the accuracy of rail vehicle air brake force control and vehicle deceleration control is further improved, and the riding comfort of passengers is improved.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a flow chart of a rail vehicle brake cylinder pressure calculation method according to an embodiment of the present application;
FIG. 2 is a flow chart illustrating steps of a method for calculating brake cylinder pressure of a railway vehicle according to an embodiment of the present application;
FIG. 3 is a schematic diagram of brake cylinder pressure calculation coefficients versus vehicle load according to an embodiment of the present application;
FIG. 4 is a graphical illustration of another brake cylinder pressure calculation coefficient versus vehicle load according to an embodiment of the present application;
FIG. 5 is a block diagram of a rail vehicle brake cylinder pressure calculation system according to an embodiment of the present application;
FIG. 6 is a block diagram of a substructure of a rail vehicle brake cylinder pressure calculation system according to an embodiment of the present application.
Wherein:
1. a data acquisition module; 2. an air braking force demand value acquisition module; 3. a dynamic brake cylinder pressure conversion coefficient obtaining module; 4. a brake cylinder pressure acquisition module;
301. a load interval segmentation module; 302. a load interval judgment module; 303. and the dynamic brake cylinder pressure conversion coefficient calculation module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application.
It is obvious that the drawings in the following description are only examples or embodiments of the present application, and that it is also possible for a person skilled in the art to apply the present application to other similar contexts on the basis of these drawings without inventive effort. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein means two or more. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.
Conventionally, a fixed brake cylinder pressure conversion coefficient is used, and in order to meet the vehicle deceleration requirement under different load working conditions, the fixed brake cylinder pressure conversion coefficient is fixedK FtoP The conversion factor K of the brake cylinder pressure can only be taken when AW3 is loadedAW3At AW0 and AW2 loads, the vehicle deceleration is greater, particularly at AW0 loads, which results in a very poor ride experience for the passengers. In order to solve the above problems, embodiments of the present application provide a method and a system for calculating a brake cylinder pressure of a railway vehicle, a brake control system, and an electronic device readable storage medium, which are more suitable for practical situations, and are specifically described as follows.
The first embodiment is as follows:
the embodiment provides a rail vehicle brake cylinder pressure calculation method. Fig. 1 is a flowchart of a rail vehicle brake cylinder pressure calculation method according to an embodiment of the present application, and as shown in fig. 1, the flowchart includes the following steps:
a data acquisition step S1, wherein the data acquisition step comprises the steps of collecting load information of the rail vehicle through a brake control system, and acquiring instruction information of the rail vehicle when the vehicle applies brake, wherein the instruction information comprises a brake instruction and brake level information;
an air braking force demand value obtaining step S2, calculating to obtain an air braking force demand value through a brake control system according to the instruction information and the electric braking force actual value, and/or directly calculating the air braking force demand value according to the instruction information under the pure air working condition; for example and without limitation, the braking control system calculates the total braking force demand according to the braking instruction sent by the rail vehicle and the braking level informationF General assembly At this time, the actual value of the electric braking force is set toF E If the value is 0 in the electric brake cut-off or fault state, the air brake force demand is now equal to
Figure 161787DEST_PATH_IMAGE004
。
A dynamic brake cylinder pressure conversion coefficient obtaining step S3, calculating according to the load information to obtain a dynamic brake cylinder pressure conversion coefficient;
and a brake cylinder pressure obtaining step S4, calculating the air braking force demand of the target vehicle according to the air braking force management method based on the air braking force demand, and calculating the brake cylinder pressure of the target vehicle according to the air braking force demand of the target vehicle and the dynamic brake cylinder pressure conversion coefficient. Optionally, the air braking force management method includes an equal adhesion method and an equal abrasion method.
Wherein, the brake cylinder pressure is obtained by calculation according to the following model (1):
Figure 75517DEST_PATH_IMAGE005
wherein, P is the pressure of the brake cylinder,K FtoP the conversion coefficient of the brake cylinder pressure is F, the air braking force demand value is F, and the compensation value is b. It is noted that the compensation value b is a constant value, and isThe brake cylinder pressure for relieving the spring reset force of the brake cylinder is obtained by calculating related technical parameters of a basic brake device of the brake control system.
In the dynamic brake cylinder pressure conversion coefficient obtaining step S3, the dynamic brake cylinder pressure conversion coefficient is obtainedK FtoP Calculated according to the following model (2):
Figure 881799DEST_PATH_IMAGE001
wherein, KAW3The conversion coefficient of brake cylinder pressure at the time of overload (AW 3 load), KAW0Brake cylinder pressure conversion factor at no load (AW 0 load), W is current vehicle load, W isAW0No load, WAW3Is an overload.
Based on the steps, the brake cylinder pressure calculation method can more flexibly and accurately obtain the brake cylinder pressure of the target vehicle, and further contributes to a brake control system to flexibly and accurately control the application of the air braking force.
Fig. 3 is a schematic diagram of a relationship between a brake cylinder pressure calculation coefficient and a vehicle load according to an embodiment of the present application, and referring to fig. 3, the present application uses a dynamic brake cylinder pressure conversion coefficient calculation method, and the brake cylinder pressure conversion coefficient is associated with the vehicle load and processed as a linear relationship, and the obtained brake cylinder pressure conversion coefficient is a dynamic value that changes according to the vehicle load, so that the air brake force control and the vehicle deceleration control are realized more accurately, and are more suitable for actual use conditions, and passenger comfort is increased.
It should be noted that the steps illustrated in the above-described flow diagrams or in the flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and that, although a logical order is illustrated in the flow diagrams, in some cases, the steps illustrated or described may be performed in an order different than here.
The second embodiment is as follows:
the embodiment also provides a rail vehicle brake cylinder pressure calculation method. Fig. 2 is a flowchart illustrating sub-steps of a brake cylinder pressure calculating method for a railway vehicle according to another embodiment of the present application, and as shown in fig. 2, the flowchart includes all steps of the first embodiment, and the difference from the first embodiment is that the dynamic brake cylinder pressure conversion coefficient obtaining step S3 further includes:
a load interval segmentation step S301, wherein interval segmentation is carried out on the relation between the brake cylinder pressure conversion coefficient and the vehicle load according to a preset vehicle load threshold; optionally, referring to fig. 4, in the present embodiment, the vehicle load threshold is preset as a full load, and the relationship between the brake cylinder pressure conversion coefficient and the vehicle load is further subdivided into a linear relationship between two intervals according to the full load, so as to meet an application environment with a finer requirement.
A load section determination step S302 of determining a load section to which the current vehicle load of the target vehicle belongs, based on the load information;
and a dynamic brake cylinder pressure conversion coefficient calculation step S303, wherein the dynamic brake cylinder pressure conversion coefficient is calculated according to the load information and the load interval. Specifically, the step S303 of calculating the dynamic brake cylinder pressure conversion coefficient further includes:
when the current vehicle load is less than the full load and greater than the no-load, the pressure conversion coefficient of the dynamic brake cylinderK FtoP Calculated according to the following model (3):
Figure 259690DEST_PATH_IMAGE006
wherein, KAW2The conversion factor for brake cylinder pressure at full load (AW 2 load), KAW0Brake cylinder pressure conversion factor at no load (AW 0 load), W is current vehicle load, W isAW0No load (AW 0 load), WAW2Full load (AW 2 load).
In some embodiments, the step of calculating the dynamic brake cylinder pressure conversion coefficient further comprises:
dynamic brake cylinder pressure conversion factor when current vehicle load is less than overload load and greater than full loadK FtoP Calculated according to the following model (4):
Figure 1382DEST_PATH_IMAGE007
wherein, KAW3The conversion coefficient of brake cylinder pressure at the time of overload (AW 3 load), KAW2The brake cylinder pressure conversion coefficient at full load (AW 2 load), W is the current vehicle load, W is the brake cylinder pressure conversion coefficient at full loadAW2At full load (AW 2 load), WAW3Is an overload load (AW 3 load).
Notably, in the application, the AW0 load, AW2 load, and AW3 load are known.
Based on the steps, compared with the first specific embodiment, the brake cylinder pressure calculation method can meet the requirements of being more accurate and strict.
It should be noted that the steps illustrated in the above-described flow diagrams or in the flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and that, although a logical order is illustrated in the flow diagrams, in some cases, the steps illustrated or described may be performed in an order different than here.
The third concrete embodiment:
the embodiment also provides a brake cylinder pressure calculation system for a railway vehicle, which is used for implementing the above embodiments and preferred embodiments, and the description of the system is omitted. As used hereinafter, the terms "module," "unit," "subunit," and the like may implement a combination of software and/or hardware for a predetermined function. While the system described in the embodiments below is preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.
Fig. 5 is a block diagram of a rail vehicle brake cylinder pressure calculation system according to an embodiment of the present application, and as shown in fig. 5, the system includes:
the data acquisition module 1 is used for collecting load information of the rail vehicle through a brake control system and acquiring instruction information of the rail vehicle when the vehicle applies brake, wherein the instruction information comprises a brake instruction and brake level information;
the air braking force demand value acquisition module 2 is used for calculating an air braking force demand value according to the instruction information and the electric braking force actual value through the brake control system and/or directly calculating the air braking force demand value according to the instruction information under a pure air working condition; for example and without limitation, the braking control system calculates the total braking force demand according to the braking instruction sent by the rail vehicle and the braking level informationF General assembly At this time, the actual value of the electric braking force is set toF E If the value is 0 in the electric brake cut-off or fault state, the air brake force demand is now equal to
Figure 527041DEST_PATH_IMAGE004
。
The dynamic brake cylinder pressure conversion coefficient acquisition module 3 is used for calculating to obtain a dynamic brake cylinder pressure conversion coefficient according to the load information; dynamic brake cylinder pressure conversion coefficient of the embodimentK FtoP The computational model of (2) is referenced to the model.
And the brake cylinder pressure acquisition module 4 is used for calculating the air braking force demand value of the target vehicle according to the air braking force management method based on the air braking force demand value, and calculating the brake cylinder pressure of the target vehicle according to the air braking force demand value of the target vehicle and the dynamic brake cylinder pressure conversion coefficient combined model (1). Optionally, the air braking force management method includes an equal adhesion method and an equal abrasion method.
Based on the structure, the brake cylinder pressure calculation system can more flexibly and accurately obtain the brake cylinder pressure of the target vehicle, and further contributes to the brake control system to flexibly and accurately control the application of the air braking force.
The above modules may be functional modules or program modules, and may be implemented by software or hardware. For a module implemented by hardware, the modules may be located in the same processor; or the modules can be respectively positioned in different processors in any combination.
The fourth concrete example:
fig. 6 is a block diagram of a substructure of a brake cylinder pressure calculation system of a railway vehicle according to an embodiment of the present application, and as shown in fig. 6, the system includes all modules shown in fig. 5, and furthermore, the dynamic brake cylinder pressure conversion coefficient obtaining module 3 further includes:
the load interval segmentation module 301 is used for segmenting the interval of the relation between the brake cylinder pressure conversion coefficient and the vehicle load according to a preset vehicle load threshold; optionally, referring to fig. 4, in the present embodiment, the vehicle load threshold is preset as a full load, and the relationship between the brake cylinder pressure conversion coefficient and the vehicle load is further subdivided into a linear relationship between two intervals according to the full load, so as to meet an application environment with a finer requirement.
A load section judgment module 302, configured to judge, according to the load information, a load section to which a current vehicle load of the target vehicle belongs;
a dynamic brake cylinder pressure conversion coefficient calculation module 303, configured to calculate a dynamic brake cylinder pressure conversion coefficient according to the load information and the load interval, specifically, when the current vehicle load is less than the full load and greater than the no-load, the dynamic brake cylinder pressure conversion coefficientK FtoP Calculating by adopting a model (3); when the current vehicle load is less than the overload load and greater than the full load, the dynamic brake cylinder pressure conversion coefficientK FtoP Calculated by using the model (4), and the description is omitted here.
Based on the steps, the brake cylinder pressure calculation method can meet the requirements of being more accurate and strict.
The above modules may be functional modules or program modules, and may be implemented by software or hardware. For a module implemented by hardware, the modules may be located in the same processor; or the modules can be respectively positioned in different processors in any combination.
The fifth concrete embodiment:
in combination with the rail vehicle brake cylinder pressure calculation method in the foregoing embodiment, the present application further provides a rail vehicle brake control system, where the rail vehicle brake control system executes any one of the rail vehicle brake cylinder pressure calculation methods in the foregoing embodiments when performing air braking force calculation.
The sixth specific embodiment:
in combination with the rail vehicle brake cylinder pressure calculation method in the foregoing embodiment, the present application embodiment may be implemented by providing an electronic device readable storage medium. The electronic device readable storage medium has stored thereon a computer program which, when executed, implements any one of the rail vehicle brake cylinder pressure calculation methods in the above embodiments.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (9)

1. A rail vehicle brake cylinder pressure calculation method, comprising:
a data acquisition step, wherein load information and instruction information of the rail vehicle are acquired;
an air braking force demand value obtaining step, wherein the air braking force demand value is calculated according to the instruction information and the electric braking force actual value, and/or the air braking force demand value is directly calculated according to the instruction information;
a step of obtaining a pressure conversion coefficient of the dynamic brake cylinder, wherein the pressure conversion coefficient of the dynamic brake cylinder is obtained through calculation according to the load information;
a brake cylinder pressure obtaining step of calculating an air braking force demand of a target vehicle according to an air braking force management method based on the air braking force demand, and calculating a brake cylinder pressure of the target vehicle according to the air braking force demand of the target vehicle and the dynamic brake cylinder pressure conversion coefficient;
in the step of obtaining the pressure conversion coefficient of the dynamic brake cylinder, the pressure conversion coefficient of the dynamic brake cylinder is obtained by calculation according to the following model:
Figure 398068DEST_PATH_IMAGE001
wherein, KAW3Conversion coefficient of brake cylinder pressure for overload, KAW0The conversion coefficient of the pressure of the brake cylinder under no-load, W is the current vehicle load, WAW0No load, WAW3Is an overload.
2. The method for calculating brake cylinder pressure for a railway vehicle according to claim 1, wherein the step of obtaining the dynamic brake cylinder pressure conversion factor further comprises:
a load interval segmentation step, namely segmenting the interval of the relation between the brake cylinder pressure conversion coefficient and the vehicle load according to a preset vehicle load threshold;
a load section judgment step of judging a load section to which the current vehicle load of the target vehicle belongs according to the load information;
and calculating a dynamic brake cylinder pressure conversion coefficient, namely calculating the dynamic brake cylinder pressure conversion coefficient according to the load information and the load interval.
3. The method for calculating brake cylinder pressure for a railway vehicle according to claim 2, wherein the preset vehicle load threshold is full load.
4. The method for calculating brake cylinder pressure for a railway vehicle as claimed in claim 3, wherein the step of calculating the dynamic brake cylinder pressure conversion factor further comprises:
when the current vehicle load is smaller than the full load and larger than the no-load, the dynamic brake cylinder pressure conversion coefficient is obtained by calculation according to the following model:
Figure 706427DEST_PATH_IMAGE002
wherein, KAW2Conversion factor of brake cylinder pressure at full load, KAW0The conversion coefficient of the pressure of the brake cylinder under no-load, W is the current vehicle load, WAW0No load, WAW2Is full load.
5. The method for calculating brake cylinder pressure for a railway vehicle according to claim 3 or 4, wherein the step of calculating the dynamic brake cylinder pressure conversion factor further comprises:
when the current vehicle load is smaller than the overload load and larger than the full load, the dynamic brake cylinder pressure conversion coefficient is obtained by calculation according to the following model:
Figure 496529DEST_PATH_IMAGE003
wherein, KAW3Conversion coefficient of brake cylinder pressure for overload, KAW2The conversion coefficient of the brake cylinder pressure at full load, W is the current vehicle load, WAW2For full load, WAW3Is an overload.
6. A rail vehicle brake cylinder pressure calculation system for performing the rail vehicle brake cylinder pressure calculation method of any one of claims 1-5, comprising:
the data acquisition module is used for acquiring load information and instruction information of the rail vehicle;
the air braking force demand value acquisition module is used for calculating an air braking force demand value according to the instruction information and the electric braking force actual value and/or directly calculating the air braking force demand value according to the instruction information;
the dynamic brake cylinder pressure conversion coefficient acquisition module is used for calculating to obtain a dynamic brake cylinder pressure conversion coefficient according to the load information;
and the brake cylinder pressure acquisition module is used for calculating the air braking force demand of the target vehicle according to an air braking force management method based on the air braking force demand, and calculating the brake cylinder pressure of the target vehicle according to the air braking force demand of the target vehicle and the dynamic brake cylinder pressure conversion coefficient.
7. The railway vehicle brake cylinder pressure calculation system of claim 6, wherein the dynamic brake cylinder pressure conversion factor acquisition module further comprises:
the load interval segmentation module is used for segmenting the interval of the relation between the brake cylinder pressure conversion coefficient and the vehicle load according to a preset vehicle load threshold;
the load interval judging module is used for judging a load interval to which the current vehicle load of the target vehicle belongs according to the load information;
and the dynamic brake cylinder pressure conversion coefficient calculation module is used for calculating the dynamic brake cylinder pressure conversion coefficient according to the load information and the load interval.
8. A rail vehicle brake control system, characterized in that the rail vehicle brake control system implements the rail vehicle brake cylinder pressure calculation method according to one of claims 1 to 5 when calculating the air brake force.
9. An electronic device readable storage medium, on which a program is stored, which program, when being executed by a processor, is characterized in that it implements a method for brake cylinder pressure calculation for a rail vehicle according to one of claims 1 to 5.
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