CN111552996A - Integrated automobile brake system matching design platform and parameter correction method thereof - Google Patents
Integrated automobile brake system matching design platform and parameter correction method thereof Download PDFInfo
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Abstract
The invention relates to an integrated automobile brake system matching design platform and a correction method thereof, which adopt a modular design concept and divide brake system design software into three major modules, namely a brake parameter calculation sub-module, a system inspection and check sub-module and a parameter database, so that the brake system characteristics and performance parameters of a designed automobile model are serialized, generalized and standardized. In addition, the invention introduces a braking moment calculation correction coefficient to make up moment calculation deviation caused by pressure loss of an air pressure pipeline, further combines experimental measured data, and adopts a least square method to reversely correct the correction coefficient, thereby improving the consistency of a software platform and an experimental result. The developed brake system design platform based on the reverse correction of experimental data has important theoretical significance and actual engineering value for improving the reliability of brake system design.
Description
Technical Field
The invention belongs to the field of vehicle engineering, and particularly relates to an integrated automobile brake system matching design platform.
Background
The design content of the traditional automobile brake system is mainly divided into two parts, namely, the brake performance analysis of the whole automobile and the performance analysis of each component assembly of the brake system, wherein the two parts are usually performed in a crossed manner. In the automobile brake system, a plurality of components are involved, the calculation methods of the components are different, and the brake performance of the whole automobile depends on the independent performance of the components and the matching among the components. For a long time, designers rely on manual design and calculation of automobile brake performance, which is not only inefficient, but also prone to errors caused by human factors. In order to improve the working condition of designers, improve the design efficiency, shorten the development period of new products and improve the intuition of working results, it is necessary to develop the design calculation software of the automobile braking system by means of computer aided tools, and accurately calculate and analyze the braking performance of the automobile and the important parameters of the automobile braking system in the initial stage of the design.
Therefore, in order to improve the working condition of designers, reduce the design period, improve the intuition of working results and reduce the development cost, it is necessary to develop the calculation and analysis software of the automobile brake system. Namely, according to the viewpoint of 'parallel engineering' and with the help of a reasonable and efficient computer design tool, an automobile brake system model is established in a preliminary stage of design, and key parameters and automobile brake performance of the automobile brake system are accurately calculated and analyzed, so that the designed vehicle has good brake performance. Therefore, based on the actual requirements of enterprise production design, an integrated automobile brake system matching design platform is designed according to the problems of long traditional design and development period, low accuracy and complex and redundant parameter debugging of the brake system.
Disclosure of Invention
The invention aims to provide an integrated automobile brake system matching design platform for analyzing the performance of a whole automobile brake system and the brake capability of the brake system. The platform adopts a modular design concept, and braking system design software is divided into three major modules, namely a braking parameter calculation sub-module, a system inspection and check sub-module and a parameter database, so that the characteristics and performance parameters of the braking system of a designed vehicle type are serialized, generalized and standardized.
The invention discloses an integrated automobile brake system matching design platform, which adopts a modular design concept, namely, brake system design software is divided into three modules, namely a brake parameter calculation submodule, a system inspection and check submodule and a parameter database. The platform is convenient to operate and use, and can improve the design efficiency, shorten the development period of a new product and improve the intuition of a working result.
The technical scheme for realizing the invention is as follows: an integrated automobile brake system matching design platform comprises a user main interface, each sub-module for calculating brake system parameters, each sub-module for checking and checking the brake system and a brake system design platform parameter database,
the user main interface compiles the information of the same attribute into a pull-down menu according to the user main interface of the menu; the same attribute refers to information with the same brake type, brake characteristic and brake parameter; according to the interconnection of each calculation item, three types of main menus are respectively a parameter calculation, inspection and check and a parameter database, and each submodule is calculated corresponding to the brake system parameter, each submodule is inspected and checked corresponding to the brake system, and the parameter database of the brake system design platform is included;
each sub-module for calculating the parameters of the brake system is used for calculating the parameters of each module of the brake system design platform, analyzing the brake performance of the automobile and checking the system through the sub-modules, and judging whether the matching of the parameters of the whole automobile is reasonable or not; according to the functional requirements of the system, the system comprises the following sub-modules: a whole vehicle parameter submodule, a braking efficiency factor submodule, a braking torque submodule, a synchronous adhesion coefficient submodule and an ideal braking force distribution submodule;
the brake system inspection and check sub-modules are used for analyzing and calculating the overall performance index of the brake system, and the aim of the method is to predict and check whether each performance index of the design task reaches the design requirement of the automobile brake system; according to the functional requirements of the system, the system comprises the following sub-modules: the braking distance checking sub-module, the braking strength checking sub-module, the wear characteristic checking sub-module, the parking braking checking sub-module and the heat capacity checking sub-module;
the brake system design platform parameter database is used for storing and managing data, and all data related to vehicle attributes and performance analysis and calculation are stored, managed and called through the parameter database; the method comprises the following three functions: data information required by each submodule is managed in a unified mode, data transmission among functional modules is achieved, and input data of a user are stored and managed;
wherein, the main interface and the parameter database are as follows: the main interface can call each sub-module in the platform, and the parameter database can call and store parameters in the sub-modules;
each submodule for calculating the braking characteristic parameter is as follows: parameters in the submodules can be called and stored through a main interface and a parameter database, the calculation result of the brake characteristic parameter is transmitted to each submodule for checking the brake characteristic, and a calculation formula description interface can be called;
checking and checking each submodule of the brake system: the parameters in the sub-modules can be called and stored through the main interface and the parameter database, the calculation result of the brake check curve can be output, and the calculation formula explanation interface can be called.
Furthermore, each sub-module for calculating the parameters of the braking system has a function for calculating the characteristic parameters of the braking system, and comprises a basic parameter input sub-function, a basic characteristic parameter calculation sub-function and a basic characteristic curve drawing sub-function;
the basic parameter input sub-functions comprise vehicle parameter input, brake structure parameter input, vacuum booster parameter input and thermal capacity characteristic parameter input; the basic characteristic parameter calculating sub-function comprises calculation of characteristic parameters such as front and rear wheel brake efficiency factors, front and rear wheel braking torques, braking deceleration, braking force distribution coefficients, synchronous adhesion coefficients, braking strength, utilization adhesion coefficients, parking braking limit inclination angles, brake specific energy dissipation rates and the like; the basic characteristic curve drawing sub-functions comprise drawing of characteristic curves such as a braking initial speed-braking distance curve, an ideal and actual braking force distribution curve, a relation curve of an adhesion coefficient and braking intensity, a load sensing proportional valve hydraulic characteristic curve and a vacuum booster input and output characteristic curve.
Further, the vehicle parameter inputs include, but are not limited to, vehicle gross weight, front axle load, rear axle load, wheelbase, and tire rolling radius parameters; the brake structural parameter inputs include, but are not limited to, structural style, effective radius, cam base circle diameter, brake chamber air pressure, tuning arm length, and coefficient of friction; the vacuum booster parameter inputs include, but are not limited to, vacuum booster working volume, initial vacuum level, valve seat spring force, atmospheric valve area, and boost ratio; the heat capacity characteristic parameter inputs include, but are not limited to, total mass of heated metal pieces, specific heat capacity of brake drum material, specific heat capacity of heated metal pieces, and brake drum temperature rise.
Furthermore, each sub-module for checking and checking the brake system has a function of checking the performance design of the brake system, and comprises a brake distance checking sub-function, an ECE (engineering economy engineering) rule checking sub-function, a parking checking sub-function, an abrasion checking sub-function and a temperature rise checking sub-function;
the brake distance checking sub-function is used for verifying whether the brake distance of the brake at different initial speeds meets the requirements of regulations, the ECE regulation checking sub-function is used for verifying whether the brake force distribution of the front shaft and the rear shaft meets the requirements of the ECE regulations, the parking checking sub-function is used for verifying whether the limit ascending and descending inclination angle and the parking brake force meet the requirements during parking braking, the abrasion checking sub-function is used for verifying whether the abrasion characteristic parameters of the friction lining meet the requirements, and the temperature rise checking sub-function is used for verifying whether the thermal capacity and the temperature rise of the brake meet the requirements.
Further, the brake system design platform parameter database includes three major functions: the data of each functional module is managed in a unified mode, the data among the functional modules are transmitted, and the data input by a user is managed.
The data unified management function of each functional module adopts a data management module to uniformly manage all data required by the system, all data information is managed in a database in a centralized way, all data have unique elements in the database corresponding to the unique elements, and the unique elements are obtained from a parameter database according to a certain rule when the data are required to be called in the working process of the system;
the data transmission function among the functional modules is that when a user utilizes each functional module to perform corresponding calculation and analysis operations, the functional modules firstly read corresponding data information from the parameter database, and the results obtained after calculation and analysis are stored in corresponding elements of the parameter database, so that the data information stored in the parameter database is modified;
the user input data management function is that all data input by a user to the brake system matching design platform are firstly stored in a parameter database, then all function modules call corresponding data from the parameter database according to needs, at the moment, the data input from all data input dialog boxes of a program can be unified, and the parameter database can be used for assigning initial values to data members of parameter groups of all function modules.
A parameter correction method based on an integrated automobile brake system matching design platform comprises the following steps:
acquiring real vehicle test data, determining parameter groups and parameter ranges, correcting a parameter reasoning process, obtaining one or more groups of corrected parameter groups, and verifying corrected design parameters;
a. acquiring real vehicle test data, determining all correctable parameters or parameter groups, and acquiring a plurality of groups of brake system input and output data influenced by all correctable parameters or parameter groups through real vehicle tests;
b. determining parameter groups and parameter ranges, calculating theoretical output data of the braking system according to the acquired input data of the braking system through a theoretical formula and preset parameters, comparing the theoretical output data with actual output data of the system corresponding to the actual input data to obtain parameters or parameter groups to be corrected, and determining the correction ranges of the parameters or parameter groups to be corrected;
c. a correction parameter reasoning process, wherein a parameter or a parameter group to be corrected is used as an unknown identification parameter, under the same actual input data of the brake system, the square sum of the difference between the output data of the brake system and the actual output data of the system corresponding to the actual input data is calculated by a theoretical formula and the unknown identification parameter and is used as a target function, meanwhile, the correction range of the parameter or the parameter group to be corrected is used as a constraint condition of the unknown identification parameter, and the unknown identification parameter which enables the target function to be minimum is identified according to a least square method and is used as a corrected brake system parameter or parameter group result;
d. obtaining one or more groups of corrected parameter groups, when one group identifies the result of the corrected brake system parameter or parameter group according to the actual input and output data of the brake system, continuing to replace the actual input and output data of the next group of brake system, identifying the corresponding result of the corrected brake system parameter or parameter group, and finally obtaining one or more groups of corrected brake system parameters or parameter groups which are less than the number of the groups of the actual input and output data of the brake system;
e. verifying the corrected design parameters, verifying the error between the brake system output data obtained by calculating each set of corrected brake system parameters or parameter sets and the system actual output data corresponding to the actual input data under the same brake system actual input data by using the brake system actual input and output data which are not used for identifying the parameters after one or more sets of parameters or parameter sets are corrected, and finally selecting the most appropriate set of corrected brake system parameters or parameter sets as the corrected brake system design parameters according to the error.
The invention has the beneficial effects that:
1. the invention has convenient operation and use and high working efficiency.
2. The invention integrates the functions of brake system parameter design, performance check and the like.
3. The invention uses the modular design, the interface is simple, and the module calling is rapid.
4. The invention has the advantages of unified data management and convenient storage and management for users.
5. The invention uses the correction module to quickly match the vehicle brake parameters.
Drawings
FIG. 1 is a schematic diagram of a system architecture according to the present invention.
Fig. 2 is a general functional diagram of the present invention.
FIG. 3 is a diagram illustrating data management according to the present invention.
FIG. 4 is a flow chart of parameter modification according to the present invention.
Detailed Description
The invention will be described in more detail with reference to the following figures and examples, to which, however, the scope of the invention is not limited.
Fig. 1 shows a schematic diagram of an architecture of an integrated brake system matching design platform system, which mainly includes: the system comprises a user main interface, each sub-module for calculating parameters of the brake system, each sub-module for checking and checking the brake system and a parameter database of a brake system design platform.
The user main interface adopts a pull-down menu to input the information of the same attribute according to the user main interface of the menu. And according to the interconnection of each calculation item, three types of main menus are respectively a parameter calculation, inspection and check and a parameter database, and each submodule is calculated corresponding to the parameters of the brake system, each submodule is inspected and checked by the brake system and the parameter database of the brake system design platform.
Each submodule for calculating the parameters of the brake system is used for calculating the parameters of each module of the brake system design platform, is an important basis for analyzing the brake performance of the automobile and checking the system, and is vital for judging whether the matching of the parameters of the whole automobile is reasonable or not. According to the functional requirements of the system, the system comprises the following sub-modules: the system comprises a whole vehicle parameter submodule, a braking efficiency factor submodule, a braking torque submodule, a synchronous adhesion coefficient submodule and an ideal braking force distribution submodule.
The checking and checking sub-modules of the braking system are used for analyzing and calculating the overall performance index of the braking system, and the purpose is to predict and check whether each performance index of the current design task meets the design requirement of the automobile braking system. According to the functional requirements of the system, the system comprises the following sub-modules: the brake system comprises a brake distance checking submodule, a brake strength checking submodule, a wear characteristic checking submodule, a parking brake checking submodule and a heat capacity checking submodule.
The brake system design platform parameter database is a module dedicated to storing and managing data. The system is equivalent to a transfer station for calculating data, and all data about vehicle attributes and performance analysis and calculation are stored, managed and called through a parameter database. The main functions of the device comprise the following three aspects: and data information required by each submodule is managed in a unified manner, data transmission among the functional modules is realized, and input data of a user is stored and managed.
As shown in fig. 2, the general functional diagram of the integrated brake system matching design platform mainly includes three main functions: the system has the functions of brake system characteristic parameter calculation, brake system performance design check and brake system modularization design.
The brake system characteristic parameter calculating function comprises a basic parameter input sub-function, a basic characteristic parameter calculating sub-function and a basic characteristic curve drawing sub-function. The basic parameter input sub-functions comprise vehicle total weight, front shaft load, rear shaft load, shaft distance, tire rolling radius and other vehicle parameter input, brake structure parameter input such as structure type, effective radius, cam base circle diameter, brake chamber air pressure, adjusting arm length, friction coefficient and the like, vacuum booster parameter input such as vacuum booster working volume, initial vacuum degree, valve seat spring force, atmospheric valve area, boosting ratio and the like, and heat capacity characteristic parameter input such as heated metal piece total mass, brake drum material specific heat capacity, heated metal piece specific heat capacity, brake drum temperature rise and the like. The basic characteristic parameter calculating sub-function comprises calculation of characteristic parameters such as front and rear wheel brake efficiency factors, front and rear wheel braking torques, braking deceleration, braking force distribution coefficients, synchronous adhesion coefficients, braking strength, utilization adhesion coefficients, parking braking limit inclination angles, brake specific energy dissipation rates and the like. The basic characteristic curve drawing sub-functions comprise drawing of characteristic curves such as a braking initial speed-braking distance curve, an ideal and actual braking force distribution curve, a relation curve of an adhesion coefficient and braking intensity, a load sensing proportional valve hydraulic characteristic curve and a vacuum booster input and output characteristic curve.
The brake system performance design checking function comprises a brake distance checking sub-function, an ECE (engineering environmental engineering) rule checking sub-function, a parking checking sub-function, an abrasion checking sub-function and a temperature rise checking sub-function. The brake distance checking sub-function is used for verifying whether the brake distance of the brake at different initial speeds meets the requirements of regulations, the ECE regulation checking sub-function is used for verifying whether the brake force distribution of the front shaft and the rear shaft meets the requirements of the ECE regulations, the parking checking sub-function is used for verifying whether the limit ascending and descending inclination angle and the parking brake force meet the requirements during parking braking, the wear checking sub-function is used for verifying whether the wear characteristic parameters (specific energy dissipation rate and specific friction force) of the friction lining meet the requirements, and the temperature rise checking sub-function is used for verifying whether the heat capacity and the temperature rise of the brake meet the requirements.
The modularized design function of the braking system adopts a modularized design concept aiming at the difference of the calculation design method of each submodule in the process of designing the actual braking system in the process of calculating the braking parameters and checking the system performance, namely, a matching design platform of the braking system is divided into three types of modules, namely, a braking parameter calculation submodule, a system checking and checking submodule and a parameter database. Meanwhile, parameter calling and calculation result transmission of each submodule and parameter matching and optimization between different vehicle parameters and brake models enable the brake system characteristics and performance parameters of the designed vehicle model to be serialized, generalized and standardized.
Fig. 3 shows a schematic data management diagram of an integrated brake system matching design platform, which mainly includes three major functions: the data of each functional module is managed in a unified mode, the data among the functional modules are transmitted, and the data input by a user is managed.
The data unified management function of each functional module adopts a data management module to uniformly manage all data required by the system, all data information is managed in a database in a centralized way, and all data have a unique element corresponding to the element in the database. When the data is needed to be called in the working process of the system, the data is obtained from the parameter database according to a certain rule.
The data transmission function among the functional modules is that when a user utilizes each functional module to perform corresponding calculation and analysis operations, the functional modules firstly read corresponding data information from the parameter database, and the results obtained after calculation and analysis are stored in corresponding elements of the parameter database, so that the data information stored in the parameter database is modified. When other functional modules need to use the data, the data read by the other functional modules is the modified data, so that the two functional modules realize the data transmission through the parameter database.
The user input data management function is that all data input by a user to the brake system matching design platform are firstly stored in a parameter database, and then all functional modules call corresponding data from the parameter database according to needs. At this time, the data input from each data input dialog box of the program can be unified, and the parameter database can be used to assign initial values to the data members of the parameter group of each function module.
Fig. 4 shows a parameter correction flow chart of an integrated brake system matching design platform, which mainly includes five steps: acquiring real vehicle test data, determining parameter groups and parameter ranges, correcting a parameter reasoning process, obtaining one or more groups of corrected parameter groups, and verifying corrected design parameters.
In the step of acquiring the vehicle test data, all correctable parameters or parameter groups are determined, and a plurality of groups of brake system input and output data influenced by all correctable parameters or parameter groups are acquired through vehicle tests.
In the parameter group and parameter range determining step, theoretical output data of the braking system is obtained through calculation of a theoretical formula and preset parameters according to the collected input data of the braking system, the theoretical output data is compared with actual output data of the system corresponding to the actual input data to obtain parameters or parameter groups to be corrected, and meanwhile, the correction range of the parameters or parameter groups to be corrected is determined
In the correction parameter reasoning process step, a parameter or a parameter group to be corrected is used as an unknown identification parameter, under the same actual input data of the brake system, the square sum of the difference between the output data of the brake system and the actual output data of the system corresponding to the actual input data is calculated through a theoretical formula and the unknown identification parameter and is used as a target function, meanwhile, the correction range of the parameter or the parameter group to be corrected is used as a constraint condition of the unknown identification parameter, and the unknown identification parameter which enables the target function to be minimum is identified according to a least square method and is used as a corrected brake system parameter or parameter group result.
In the step of obtaining one or more corrected sets of parameters, when one set identifies the corrected brake system parameters or parameter set results according to the actual input and output data of the brake system, the actual input and output data of the next set of brake system is continuously replaced, and corresponding corrected brake system parameters or parameter set results are identified. And finally obtaining one or more groups of corrected brake system parameters or parameter groups which are less than the number of the actual input and output data groups of the brake system.
In the step of verifying the corrected design parameters, after one or more groups of parameters or parameter groups of corrected brake system parameters are obtained, the error between the brake system output data calculated by each group of corrected brake system parameters or parameter groups and the system actual output data corresponding to the actual input data is verified by using the brake system actual input and output data which are not used for identifying the parameters under the same brake system actual input data. And finally, selecting the most appropriate group of corrected brake system parameters or parameter groups as the corrected brake system design parameters according to the errors.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides an integrated form car braking system matches design platform which characterized in that: comprises a user main interface, each submodule for calculating parameters of the brake system, each submodule for checking and checking the brake system and a parameter database of a brake system design platform,
the user main interface compiles the information of the same attribute into a pull-down menu according to the user main interface of the menu; the same attribute refers to information with the same brake type, brake characteristic and brake parameter; according to the interconnection of each calculation item, three types of main menus are respectively a parameter calculation, inspection and check and a parameter database, and each submodule is calculated corresponding to the brake system parameter, each submodule is inspected and checked corresponding to the brake system, and the parameter database of the brake system design platform is included;
each sub-module for calculating the parameters of the brake system is used for calculating the parameters of each module of the brake system design platform, analyzing the brake performance of the automobile and checking the system through the sub-modules, and judging whether the matching of the parameters of the whole automobile is reasonable or not; according to the functional requirements of the system, the system comprises the following sub-modules: a whole vehicle parameter submodule, a braking efficiency factor submodule, a braking torque submodule, a synchronous adhesion coefficient submodule and an ideal braking force distribution submodule;
the brake system inspection and check sub-modules are used for analyzing and calculating the overall performance index of the brake system, and the aim of the method is to predict and check whether each performance index of the design task reaches the design requirement of the automobile brake system; according to the functional requirements of the system, the system comprises the following sub-modules: the braking distance checking sub-module, the braking strength checking sub-module, the wear characteristic checking sub-module, the parking braking checking sub-module and the heat capacity checking sub-module;
the brake system design platform parameter database is used for storing and managing data, and all data related to vehicle attributes and performance analysis and calculation are stored, managed and called through the parameter database; the method comprises the following three functions: data information required by each submodule is managed in a unified mode, data transmission among functional modules is achieved, and input data of a user are stored and managed;
wherein, the main interface and the parameter database are as follows: the main interface can call each sub-module in the platform, and the parameter database can call and store parameters in the sub-modules;
each submodule for calculating the braking characteristic parameter is as follows: parameters in the submodules can be called and stored through a main interface and a parameter database, the calculation result of the brake characteristic parameter is transmitted to each submodule for checking the brake characteristic, and a calculation formula description interface can be called;
checking and checking each submodule of the brake system: the parameters in the sub-modules can be called and stored through the main interface and the parameter database, the calculation result of the brake check curve can be output, and the calculation formula explanation interface can be called.
2. The integrated automotive brake system matching design platform of claim 1, wherein: each sub-module for calculating the parameters of the braking system has a function for calculating the characteristic parameters of the braking system and comprises a basic parameter input sub-function, a basic characteristic parameter calculating sub-function and a basic characteristic curve drawing sub-function;
the basic parameter input sub-functions comprise vehicle parameter input, brake structure parameter input, vacuum booster parameter input and thermal capacity characteristic parameter input; the basic characteristic parameter calculating sub-function comprises calculation of characteristic parameters such as front and rear wheel brake efficiency factors, front and rear wheel braking torques, braking deceleration, braking force distribution coefficients, synchronous adhesion coefficients, braking strength, utilization adhesion coefficients, parking braking limit inclination angles, brake specific energy dissipation rates and the like; the basic characteristic curve drawing sub-functions comprise drawing of characteristic curves such as a braking initial speed-braking distance curve, an ideal and actual braking force distribution curve, a relation curve of an adhesion coefficient and braking intensity, a load sensing proportional valve hydraulic characteristic curve and a vacuum booster input and output characteristic curve.
3. The integrated automotive brake system matching design platform of claim 2, wherein: the vehicle parameter inputs include, but are not limited to, vehicle gross weight, front axle load, rear axle load, wheelbase, and tire rolling radius parameters; the brake structural parameter inputs include, but are not limited to, structural style, effective radius, cam base circle diameter, brake chamber air pressure, tuning arm length, and coefficient of friction; the vacuum booster parameter inputs include, but are not limited to, vacuum booster working volume, initial vacuum level, valve seat spring force, atmospheric valve area, and boost ratio; the heat capacity characteristic parameter inputs include, but are not limited to, total mass of heated metal pieces, specific heat capacity of brake drum material, specific heat capacity of heated metal pieces, and brake drum temperature rise.
4. The integrated automotive brake system matching design platform of claim 1, wherein: each sub-module for checking and checking the brake system has a function of checking the performance design of the brake system, and comprises a brake distance checking sub-function, an ECE (engineering control element) regulation checking sub-function, a parking checking sub-function, an abrasion checking sub-function and a temperature rise checking sub-function;
the brake distance checking sub-function is used for verifying whether the brake distance of the brake at different initial speeds meets the requirements of regulations, the ECE regulation checking sub-function is used for verifying whether the brake force distribution of the front shaft and the rear shaft meets the requirements of the ECE regulations, the parking checking sub-function is used for verifying whether the limit ascending and descending inclination angle and the parking brake force meet the requirements during parking braking, the abrasion checking sub-function is used for verifying whether the abrasion characteristic parameters of the friction lining meet the requirements, and the temperature rise checking sub-function is used for verifying whether the thermal capacity and the temperature rise of the brake meet the requirements.
5. The integrated automotive brake system matching design platform of claim 1, wherein: the brake system design platform parameter database includes three major categories of functions: the data of each functional module is managed in a unified mode, the data among the functional modules are transmitted, and the data input by a user is managed.
6. The integrated automotive brake system matching design platform of claim 5, wherein: the data unified management function of each functional module adopts a data management module to uniformly manage all data required by the system, all data information is managed in a database in a centralized way, all data have unique elements in the database corresponding to the unique elements, and the unique elements are obtained from a parameter database according to a certain rule when the data are required to be called in the working process of the system;
the data transmission function among the functional modules is that when a user utilizes each functional module to perform corresponding calculation and analysis operations, the functional modules firstly read corresponding data information from the parameter database, and the results obtained after calculation and analysis are stored in corresponding elements of the parameter database, so that the data information stored in the parameter database is modified;
the user input data management function is that all data input by a user to the brake system matching design platform are firstly stored in a parameter database, then all function modules call corresponding data from the parameter database according to needs, at the moment, the data input from all data input dialog boxes of a program can be unified, and the parameter database can be used for assigning initial values to data members of parameter groups of all function modules.
7. A parameter correction method based on an integrated automobile brake system matching design platform is characterized by comprising the following steps of: comprises the following steps of (a) carrying out,
acquiring real vehicle test data, determining parameter groups and parameter ranges, correcting a parameter reasoning process, obtaining one or more groups of corrected parameter groups, and verifying corrected design parameters;
a. acquiring real vehicle test data, determining all correctable parameters or parameter groups, and acquiring a plurality of groups of brake system input and output data influenced by all correctable parameters or parameter groups through real vehicle tests;
b. determining parameter groups and parameter ranges, calculating theoretical output data of the braking system according to the acquired input data of the braking system through a theoretical formula and preset parameters, comparing the theoretical output data with actual output data of the system corresponding to the actual input data to obtain parameters or parameter groups to be corrected, and determining the correction ranges of the parameters or parameter groups to be corrected;
c. a correction parameter reasoning process, wherein a parameter or a parameter group to be corrected is used as an unknown identification parameter, under the same actual input data of the brake system, the square sum of the difference between the output data of the brake system and the actual output data of the system corresponding to the actual input data is calculated by a theoretical formula and the unknown identification parameter and is used as a target function, meanwhile, the correction range of the parameter or the parameter group to be corrected is used as a constraint condition of the unknown identification parameter, and the unknown identification parameter which enables the target function to be minimum is identified according to a least square method and is used as a corrected brake system parameter or parameter group result;
d. obtaining one or more groups of corrected parameter groups, when one group identifies the result of the corrected brake system parameter or parameter group according to the actual input and output data of the brake system, continuing to replace the actual input and output data of the next group of brake system, identifying the corresponding result of the corrected brake system parameter or parameter group, and finally obtaining one or more groups of corrected brake system parameters or parameter groups which are less than the number of the groups of the actual input and output data of the brake system;
e. verifying the corrected design parameters, verifying the error between the brake system output data obtained by calculating each set of corrected brake system parameters or parameter sets and the system actual output data corresponding to the actual input data under the same brake system actual input data by using the brake system actual input and output data which are not used for identifying the parameters after one or more sets of parameters or parameter sets are corrected, and finally selecting the most appropriate set of corrected brake system parameters or parameter sets as the corrected brake system design parameters according to the error.
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