Method and system for selecting parts for a vehicle braking system

Abstract

The application discloses a kind of for vehicle brake system parts selection method and system, wherein, method includes brake system parameter according to design requirement acquisition and input, determine parameter definition and configuration to determine corresponding part basic data;Mathematical model is loaded by programming, brake deceleration and pedal force relationship curve are calculated and generated;With target brake deceleration and pedal force relationship curve are compared;If it is not in conformity with then adjustment design requirement, input adjusted brake system parameter, brake deceleration and pedal force relationship curve are regenerated and compared with target brake deceleration and pedal force relationship curve;The application accurately calculates the relationship of brake deceleration and pedal stroke, pedal force, and obtains intuitive visual deceleration and pedal force, pedal stroke relationship curve, in selection stage, each part of brake system is matched, and the optimal scheme of cost, period is selected, vehicle development cycle is shortened, and development cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of vehicle control design technology, and in particular to a method and system for selecting components for a vehicle braking system. Background Technology

[0002] With the development of society and vehicle technology, people have higher and higher requirements for vehicle safety and comfort, which has led to an accelerated pace of vehicle upgrades and replacements. This forces vehicle manufacturers to shorten the research and development cycle of their vehicles, as the shortened development cycle makes it difficult to guarantee the requirements of comfort and safety in the produced vehicles.

[0003] Vehicle braking systems have extremely high requirements for safety, reliability, and comfort. Nowadays, research, development, and selection are generally carried out by experienced designers, which has a high design threshold and a long design cycle. This approach greatly affects the vehicle production cycle. If the design and development of a vehicle braking system is completed in a short time, it is difficult to guarantee reliability, comfort, and safety. The above problems urgently need to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a method and system for selecting components for a vehicle braking system, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for selecting components for a vehicle braking system, comprising:

[0006] Set up a component parameter selection library for the vehicle braking system, wherein the parameter selection library includes the definition and configuration of the parameters;

[0007] A parts library for the vehicle braking system is set up, wherein the parts library includes basic parts data;

[0008] Obtain the braking system parameters according to the design requirements;

[0009] In response to the input braking system parameters, determine the corresponding parameter definitions and configurations in the parameter selection library;

[0010] Based on the determined parameter definitions and configurations in the parameter selection library, the corresponding basic data of the parts library are determined.

[0011] The vehicle braking system component selection mode loads a mathematical model through programming and generates a curve showing the relationship between braking deceleration and pedal force based on the calculations of the mathematical model.

[0012] The generated braking deceleration versus pedal force curve is compared with the target braking deceleration versus pedal force curve.

[0013] If it does not meet the requirements, it is an unreasonable design. The design requirements are adjusted, and the adjusted braking system parameters are obtained. The adjusted braking system parameters are input to generate a braking deceleration-pedal force relationship curve, which is then compared with the target braking deceleration-pedal force relationship curve.

[0014] If they match, then it is a reasonable design.

[0015] Furthermore, the vehicle braking system component selection mode loads a mathematical model through programming, and generates a curve showing the relationship between braking deceleration and pedal force based on the calculations of the mathematical model. The mathematical model also includes the following formula for the relationship between braking deceleration and pedal force:

[0016] G = 2 × Q × R p ×R v ×(D f 2 ×F f ×R f +D r 2 ×F r ×R r ) / (R t ×D m 2 ×W)——Formula 1;

[0017] Where G is deceleration; Q is pedal force; R p It's the pedal ratio; R v It refers to the booster's booster ratio; D f It is the front caliper cylinder bore; F f It is the front caliper braking factor; R f It is the effective radius of the front brake disc; D r It is the rear caliper cylinder diameter; F r It is the rear caliper braking factor; R r R is the effective radius of the rear brake disc; t It is the tire rolling radius; D m W is the main cylinder bore; W is the vehicle weight.

[0018] Furthermore, the factors influencing the relationship between braking deceleration and pedal force also include master cylinder conversion efficiency, front and rear caliper conversion efficiency, frontal area, and drag coefficient. Therefore, the formula for the relationship between braking deceleration and pedal force is:

[0019] G = 2 × Q × R p ×R v ×(D f 2 ×F f ×R f +D r 2 ×F r ×Rr )×K b ×K l / (R) t ×D m 2 ×W)+S v ×K w ——Formula 2;

[0020] Among them, K b It is the main cylinder conversion efficiency, K l It refers to the conversion efficiency of front and rear calipers, S v It is the windward area; K w It is the drag coefficient.

[0021] Furthermore, the selection of vehicle braking system components must take into account pedal travel, which is related to master cylinder pressure. Therefore, the mathematical model also includes a formula relating braking deceleration and master cylinder pressure:

[0022] G = P × Π × (D) f 2 ×F f ×R f +D r 2 ×F r ×R r )×K l / (2×R t ×W) + S v ×K w ——Formula 3;

[0023] Where P is the master cylinder pressure and π is pi.

[0024] Furthermore, including:

[0025] Different master cylinder pressures correspond to the corresponding pedal deformation, front bulkhead deformation, brake hose expansion, master cylinder expansion, and front and rear caliper expansion. The pedal deformation, front bulkhead deformation, brake hose expansion, master cylinder expansion, and front and rear caliper expansion under master cylinder pressure correspond to the pedal travel, thus establishing a relationship between deceleration and pedal travel through master cylinder pressure.

[0026] The relationship between pedal deformation, front bulkhead deformation, brake hose expansion, master cylinder expansion, and front and rear caliper expansion and pedal travel is as follows:

[0027] S=[2×(V pf +V cf +V pr +V cr )+V m ] / (Π×D m 2 / 4)+ Lp +L b ——Formula 4;

[0028] Where S is the pedal travel, V pf This is the expansion amount of the front brake hose, V. cf It is the front caliper expansion, V pr This refers to the expansion of the rear brake hose, V. cr It is the rear caliper expansion amount, V m It is the expansion amount of the master cylinder, L p It is the pedal deformation, L b It is the deformation of the front bulkhead.

[0029] Furthermore, the master cylinder stroke is also affected by the master cylinder idle stroke, the front caliper idle stroke, and the rear caliper idle stroke, and the relationship formula is as follows:

[0030] S=[2×(V pf +V cf +V pr +V cr )+V m ] / (Π×D m 2 / 4)+L p +L b +R p ×(S b +S cf ×D f 2 / D m 2 +S cr ×D r 2 / D m 2 )——Formula 5;

[0031] Among them, S b It is the master cylinder idle stroke; S cf It is the front caliper's free travel; S cr This is the rear caliper's idle travel.

[0032] Furthermore, if the design does not meet the requirements, it is considered an unreasonable design. The design requirements are adjusted, and the adjusted braking system parameters are obtained. These adjusted parameters are then input to generate a braking deceleration versus pedal force curve, which is compared with the target braking deceleration versus pedal force curve. This process also includes:

[0033] A braking system parameter variation model is established, which is used to generate braking system parameter adjustment rules. Based on the adjustment rules, the adjusted braking system parameters are generated.

[0034] Furthermore, comparing the generated braking deceleration versus pedal force curve with the target braking deceleration versus pedal force curve also includes:

[0035] Starting with the braking system parameters input into the vehicle braking system component selection mode, the process continues until a reasonable design that matches the comparison result is determined. Each comparison result is then generated into a visual file and stored for user review.

[0036] On the other hand, a component selection system for vehicle braking systems is provided, including:

[0037] The first storage module is used to store the part parameter selection library and the part library;

[0038] The acquisition module is used to acquire braking system parameters according to design requirements;

[0039] A braking system parameter variation model is used to generate braking system parameter adjustment rules, and based on the adjustment rules, the adjusted braking system parameters are generated.

[0040] The selection module is used to determine the corresponding parameter definitions and configurations in the parameter selection library based on the braking system parameters and the adjusted braking system parameters, and to determine the corresponding basic data of the parts library based on the determined parameter definitions and configurations in the parameter selection library.

[0041] The calculation module is used to generate a curve showing the relationship between braking deceleration and pedal force based on the calculation of the mathematical model.

[0042] The judgment module compares the generated braking deceleration versus pedal force curve with the target braking deceleration versus pedal force curve. If they do not match, the design is deemed unreasonable. The design requirements are adjusted, and the adjusted braking system parameters are obtained. The adjusted braking system parameters are input, and the braking deceleration versus pedal force curve is generated and compared with the target braking deceleration versus pedal force curve. If they match, the design is deemed reasonable.

[0043] The second storage module is used to start with the input braking system parameters and end when the comparison result is determined to be a reasonable design that matches the input parameters. It generates a visual file for each comparison result and stores it for users to view.

[0044] Furthermore, a vehicle braking system component selection mode is installed on a host computer and is used to retrieve the first storage module, the acquisition module, the braking system parameter change model, the selection module, the calculation module, the judgment module, and the second storage module to execute the vehicle braking system component selection program.

[0045] Compared with the prior art, the beneficial effects of the present invention are: the present invention can accurately calculate the relationship between braking deceleration and pedal travel and pedal force, and obtain intuitive and visual curves showing the relationship between deceleration and pedal force and pedal travel. During the selection stage, the components of the braking system are matched to select the optimal solution in terms of cost and cycle. Under the premise of ensuring driving comfort, the system development efficiency is greatly improved, the vehicle development cycle is shortened, and the development cost is reduced. Attached Figure Description

[0046] Figure 1 This is a flowchart of a method for selecting components for a vehicle braking system according to an embodiment of the present invention;

[0047] Figure 2 This is a block diagram of a component selection and connection method for a vehicle braking system according to an embodiment of the present invention;

[0048] Figure 3 This is a graph showing the relationship between braking deceleration and pedal force in an embodiment of the present invention;

[0049] Figure 4 This is a graph showing the relationship between braking deceleration and pedal travel in an embodiment of the present invention.

[0050] In the diagram: 10, First storage module; 20, Acquisition module; 30, Braking system parameter change model; 40, Selection module; 50, Calculation module; 60, Judgment module; 70, Second storage module. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] Please refer to the accompanying drawings in the specification. This invention provides a technical solution: such as... Figure 1 As shown, a method for selecting components for a vehicle braking system includes the following steps:

[0055] S102. Set up a component parameter selection library for the vehicle braking system, wherein the parameter selection library includes the definition and configuration of parameters;

[0056] Specifically, the part parameter selection library is pre-set.

[0057] S104. Set up a parts library for the vehicle braking system, wherein the parts library includes basic parts data;

[0058] Specifically, the parts library for the vehicle braking system is pre-set.

[0059] S106. Obtain braking system parameters according to design requirements;

[0060] Specifically, those skilled in the art can set parameters according to specific design requirements. For example, the application area, applicable environment, applicable standards, operating load, braking type, etc., can be used as the braking system parameters to be obtained. The more braking system parameters the user needs to obtain, the more accurate the design results will be.

[0061] S108. The vehicle braking system component selection mode responds to the input braking system parameters and determines the corresponding parameter definitions and configurations in the parameter selection library.

[0062] Specifically, the input braking system parameters serve as search criteria in the vehicle braking system component selection mode, enabling the component parameter selection library to respond and match the corresponding parameter definitions and configurations. The component parameter selection library stores the definitions and configurations of multiple parameters mapped based on the input braking system parameters.

[0063] S110. Based on the parameter definitions and configurations in the parameter selection library, determine the corresponding basic data of the parts library;

[0064] Specifically, the parts library stores basic data of parts mapped according to parameter definitions and configurations. This basic data includes drawing number, name, model, specifications, category, applicable standards, selection condition parameters, technical parameters, and model number. Technical parameters include pedal ratio, power steering ratio, front caliper cylinder bore, front caliper braking factor, effective radius of front brake disc, rear caliper cylinder bore, rear caliper braking factor, effective radius of rear brake disc, tire rolling radius, master cylinder bore, vehicle weight, master cylinder conversion efficiency, front and rear caliper conversion efficiency, frontal area, drag coefficient, master cylinder pressure, pedal travel, master cylinder idle travel, front caliper idle travel, and rear caliper idle travel. The more basic data of the parts that are defined, and the more accurate the technical parameters, the higher the design precision. This is crucial when designing using the parameter selection library and the parts library.

[0065] S112. The vehicle braking system component selection mode loads a mathematical model through programming and generates a curve showing the relationship between braking deceleration and pedal force based on the calculation of the mathematical model.

[0066] Specifically, this can be achieved by embedding program code into the software backend. Preferably, a MATLAB application M-file can be compiled as a mathematical model. By using the MATLAB program to extend the system, loading and running the compiled M-file, the relationship curves between deceleration and pedal force and pedal travel can be obtained. The mathematical model is a method for calculating brake pedal feel.

[0067] S114. Compare the generated braking deceleration versus pedal force curve with the target braking deceleration versus pedal force curve.

[0068] Specifically, the target braking deceleration and pedal force relationship curve is a pre-set braking deceleration and pedal force relationship curve that meets the design expectations. This curve is used as a standard to verify the generated braking deceleration and pedal force relationship curve. A curve fluctuation range threshold is set, and the generated braking deceleration and pedal force relationship curve is compared with the target braking deceleration and pedal force relationship curve with the set curve fluctuation range threshold.

[0069] S116. If it does not meet the requirements, it is an unreasonable design. Adjust the design requirements, obtain the adjusted braking system parameters, input the adjusted braking system parameters, generate the braking deceleration and pedal force relationship curve, and compare it with the target braking deceleration and pedal force relationship curve.

[0070] S118. If it conforms, it is a reasonable design.

[0071] Specifically, if the generated braking deceleration vs. pedal force curve falls outside a set curve fluctuation range threshold, an unreasonable design result is output; if the generated braking deceleration vs. pedal force curve falls within a set curve fluctuation range threshold, a reasonable design result is output; wherein, preferably, such as Figure 3 As shown, the FCC standard fluctuation range is set, i.e., the threshold value for the fluctuation range of the target braking deceleration versus pedal force curve and the target braking deceleration versus pedal force curve; for example... Figure 4 As shown, the FCC standard fluctuation range is set, which is the threshold value of the fluctuation range of the curve of the relationship between target braking deceleration and pedal travel.

[0072] In the above embodiments, the present invention determines the basic data of corresponding parts in the parts library by responding to the input braking system parameters through the vehicle braking system parts selection mode. A braking deceleration-pedal force relationship curve is generated using a mathematical model and the determined basic part data. This curve is compared and corrected with the target braking deceleration-pedal force relationship curve to finally obtain a reasonably designed ideal braking deceleration-pedal force relationship curve. Similarly, an ideal braking deceleration-pedal travel relationship curve can be obtained. The present invention accurately calculates the relationship between braking deceleration and pedal travel / pedal force, and obtains intuitive and visualized deceleration-pedal force / pedal travel relationship curves. During the selection phase, the various parts of the braking system are matched to select the optimal solution in terms of cost and cycle time. While ensuring driving comfort, this greatly improves system development efficiency, shortens the vehicle development cycle, and reduces development costs.

[0073] Optionally, the vehicle braking system component selection mode loads a mathematical model through programming and generates a curve showing the relationship between braking deceleration and pedal force based on the calculations of the mathematical model. The mathematical model also includes the following formula for the relationship between braking deceleration and pedal force:

[0074] G = 2 × Q × R p ×R v ×(D f 2 ×F f ×R f +D r 2 ×F r ×R r ) / (R t ×D m 2 ×W)——Formula 1;

[0075] Where G is deceleration; Q is pedal force; R p It's the pedal ratio; R v It refers to the booster's booster ratio; D f It is the front caliper cylinder bore; F f It is the front caliper braking factor; R f It is the effective radius of the front brake disc; D r It is the rear caliper cylinder diameter; F r It is the rear caliper braking factor; R rR is the effective radius of the rear brake disc; t It is the tire rolling radius; D m W is the main cylinder bore; W is the vehicle weight.

[0076] like Figure 3 As shown in the above embodiment, during the selection stage, the components of the braking system are matched, and the component parameters are: pedal ratio, booster boost ratio, front caliper cylinder bore, front caliper braking factor, front brake disc effective radius, rear caliper cylinder bore; rear caliper braking factor, rear brake disc effective radius, tire rolling radius, master cylinder bore, and vehicle weight. Based on the selection of the above parameters, the relationship between braking deceleration G and pedal force Q is determined, and a braking deceleration vs. pedal force curve is generated accordingly.

[0077] Optionally, the factors affecting the relationship between braking deceleration and pedal force also include master cylinder conversion efficiency, front and rear caliper conversion efficiency, frontal area, and drag coefficient. Therefore, the formula for the relationship between braking deceleration and pedal force is:

[0078] G = 2 × Q × R p ×R v ×(D f 2 ×F f ×R f +D r 2 ×F r ×R r )×K b ×K l / (R) t ×D m 2 ×W)+S v ×K w ——Formula 2;

[0079] Among them, K b It is the main cylinder conversion efficiency, K l It refers to the conversion efficiency of front and rear calipers, S v It is the windward area; K w It is the drag coefficient.

[0080] In the above embodiments, the relationship between pedal force and deceleration calculated using Formula 1 will deviate somewhat from reality, requiring some revisions. After summarizing and verifying multiple projects, the revised calculation formula 2 incorporates the influencing factors of master cylinder conversion efficiency, rear caliper conversion efficiency, frontal area, and drag coefficient. Based on the summarizing and verifying multiple projects, the empirical value for rear caliper conversion efficiency is 0.98; the empirical value for both front and rear caliper conversion efficiency is 0.98; and the empirical value for frontal area is 2.4m². 2 The empirical value for the drag coefficient is 0.32.

[0081] Optionally, the selection of vehicle braking system components must take into account pedal travel, which is related to master cylinder pressure. Therefore, the mathematical model also includes a formula relating braking deceleration and master cylinder pressure:

[0082] G = P × Π × (D) f 2 ×F f ×R f +D r 2 ×F r ×R r )×K l / (2×R t ×W) + S v ×K w ——Formula 3;

[0083] Where P is the master cylinder pressure and π is pi.

[0084] In the above embodiments, the relationship between braking deceleration G and master cylinder pressure P is determined by the parameters in Formula 3.

[0085] Optionally, different master cylinder pressures correspond to the corresponding pedal deformation, front bulkhead deformation, brake hose expansion, master cylinder expansion, and front and rear caliper expansion. The pedal deformation, front bulkhead deformation, brake hose expansion, master cylinder expansion, and front and rear caliper expansion under master cylinder pressure correspond to the pedal travel, thereby establishing a relationship between deceleration and pedal travel through master cylinder pressure.

[0086] The relationship between pedal deformation, front bulkhead deformation, brake hose expansion, master cylinder expansion, and front and rear caliper expansion and pedal travel is as follows:

[0087] S=[2×(V pf +V cf +V pr +V cr )+V m ] / (Π×D m 2 / 4)+ L p +L b ——Formula 4;

[0088] Where S is the pedal travel, V pf This is the expansion amount of the front brake hose, V. cf It is the front caliper expansion, V pr This refers to the expansion of the rear brake hose, V. cr It is the rear caliper expansion amount, V m It is the expansion amount of the master cylinder, L p It is the pedal deformation, L b It is the deformation of the front bulkhead.

[0089] like Figure 4 As shown in the above embodiment, the corresponding front bulkhead deformation, brake hose expansion, master cylinder expansion, and front and rear caliper expansion can be determined by the master cylinder pressure P. Therefore, the relationship between pedal travel S and master cylinder pressure P can be determined by the front bulkhead deformation, brake hose expansion, master cylinder expansion, and front and rear caliper expansion. Thus, the master cylinder pressure P establishes a relationship between deceleration G and pedal travel S through formulas 3 and 4.

[0090] Optionally, the master cylinder stroke is also affected by the master cylinder idle stroke, the front caliper idle stroke, and the rear caliper idle stroke, and the relationship formula is as follows:

[0091] S=[2×(V pf +V cf +V pr +V cr )+V m ] / (Π×D m 2 / 4)+L p +L b +R p ×(S b +S cf ×D f 2 / D m 2 +S cr ×D r 2 / D m 2 )——Formula 5;

[0092] Among them, S b It is the master cylinder idle stroke; S cf It is the front caliper's free travel; S cr This is the rear caliper's idle travel.

[0093] In the above embodiments, the relationship between the pedal travel S calculated by Formula 4 and the deformation of the front bulkhead, the expansion of the brake hose, the expansion of the master cylinder, and the expansion of the front and rear calipers will deviate from the actual situation to a certain extent, and some revisions are needed. After summarizing and verifying multiple projects, the revised calculation formula 5 adds the influencing factors of the master cylinder idle travel, the front caliper idle travel, and the rear caliper idle travel.

[0094] Optionally, if the design does not meet the requirements, it is considered an unreasonable design. The design requirements are adjusted, and the adjusted braking system parameters are obtained. These adjusted parameters are then input to generate a braking deceleration versus pedal force curve, which is compared with the target braking deceleration versus pedal force curve. The process also includes:

[0095] A braking system parameter variation model is established, which is used to generate braking system parameter adjustment rules. Based on the adjustment rules, the adjusted braking system parameters are generated.

[0096] In the above embodiments, during the selection stage, the components of the braking system are matched, and the parameters of each component are constrained within a preset range according to the design requirements. Adjustment rules are set according to the preset range. When a set of input parameters is verified to be unreasonable design parameters, the adjusted braking system parameters are generated according to the set adjustment rules.

[0097] Optionally, comparing the generated braking deceleration versus pedal force curve with the target braking deceleration versus pedal force curve further includes:

[0098] Starting with the braking system parameters input into the vehicle braking system component selection mode, the process continues until a reasonable design that matches the comparison result is determined. Each comparison result is then generated into a visual file and stored for user review.

[0099] On the other hand, a selection system for vehicle braking system components is provided, such as Figure 2 As shown, it includes:

[0100] The first storage module 10 is used to store a part parameter selection library and a part library;

[0101] Acquisition module 20, the acquisition module 20 is used to acquire braking system parameters according to design requirements;

[0102] Braking system parameter variation model 30, the braking system parameter variation model 30 is used to generate braking system parameter adjustment rules, and generate adjusted braking system parameters according to the adjustment rules;

[0103] The selection module 40 is used to determine the corresponding parameter definitions and configurations in the parameter selection library based on the braking system parameters and the adjusted braking system parameters, and to determine the corresponding basic data of the parts library based on the determined parameter definitions and configurations in the parameter selection library.

[0104] The calculation module 50 is used to generate a curve showing the relationship between braking deceleration and pedal force based on the calculation of the mathematical model.

[0105] The judgment module 60 is used to compare the generated braking deceleration-pedal force relationship curve with the target braking deceleration-pedal force relationship curve; if they do not match, it is an unreasonable design, the design requirements are adjusted, and the adjusted braking system parameters are obtained, the adjusted braking system parameters are input, the braking deceleration-pedal force relationship curve is generated, and compared with the target braking deceleration-pedal force relationship curve; if they match, it is a reasonable design.

[0106] The second storage module 70 is used to start with the input braking system parameters and end with determining that the comparison result is a reasonable design that matches the input parameters. It generates a visual file for each comparison result and stores it for users to view.

[0107] Optionally, a vehicle braking system component selection mode 80 is installed on a host computer 90, used to retrieve the first storage module 10, the acquisition module 20, the braking system parameter change model 30, the selection module 40, the calculation module 50, the judgment module 60, and the second storage module 70 to execute the vehicle braking system component selection program.

[0108] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for selecting components for a vehicle braking system, characterized in that, include: Set up a component parameter selection library for the vehicle braking system, wherein the parameter selection library includes the definition and configuration of the parameters; A parts library for the vehicle braking system is set up, wherein the parts library includes basic parts data; Obtain the braking system parameters according to the design requirements; In response to the input braking system parameters, determine the corresponding parameter definitions and configurations in the parameter selection library; Based on the determined parameter definitions and configurations in the parameter selection library, the corresponding basic data of the parts library are determined. The vehicle braking system component selection mode loads a mathematical model through programming and generates a curve showing the relationship between braking deceleration and pedal force based on the calculations of the mathematical model. The generated braking deceleration versus pedal force curve is compared with the target braking deceleration versus pedal force curve. If it does not meet the requirements, it is an unreasonable design. The design requirements are adjusted, and the adjusted braking system parameters are obtained. The adjusted braking system parameters are input to generate a braking deceleration-pedal force relationship curve, which is then compared with the target braking deceleration-pedal force relationship curve. If it matches, then it is a reasonable design; The formula relating braking deceleration and pedal force in the mathematical model is as follows: G = 2 × Q × R p ×R v × (D f 2 ×F f ×R f +D r 2 ×F r ×R r ) / (R t ×D m 2 ×W)——Formula 1; Where G is deceleration; Q is pedal force; R p It's the pedal ratio; R v It refers to the booster's booster ratio; D f It is the front caliper cylinder bore; F f It is the front caliper braking factor; R f It is the effective radius of the front brake disc; D r It is the rear caliper cylinder diameter; F r It is the rear caliper braking factor; R r R is the effective radius of the rear brake disc; t It is the tire rolling radius; D m W is the main cylinder bore; W is the vehicle weight.

2. The method for selecting components for a vehicle braking system according to claim 1, characterized in that, The factors influencing the relationship between braking deceleration and pedal force also include master cylinder conversion efficiency, front and rear caliper conversion efficiency, frontal area, and drag coefficient. Therefore, the formula for the relationship between braking deceleration and pedal force is: G = 2 × Q × R p ×R v × (D f 2 ×F f ×R f +D r 2 ×F r ×R r ) ×K b ×K l / (R t ×D m 2 ×W)+S v × K w ——Formula 2; Among them, K b It is the main cylinder conversion efficiency, K l It refers to the conversion efficiency of front and rear calipers, S v It is the windward area; K w It is the drag coefficient.

3. The method for selecting components for a vehicle braking system according to claim 2, characterized in that, The selection of vehicle braking system components must take into account pedal travel, which is related to master cylinder pressure. Therefore, the mathematical model also includes the formula relating braking deceleration and master cylinder pressure: G = P × Π × (D) f 2 ×F f ×R f +D r 2 ×F r ×R r ) ×K l / (2×R t ×W)+S v ×K w ——Formula 3; Where P is the master cylinder pressure and π is pi.

4. The method for selecting components for a vehicle braking system according to claim 3, characterized in that, include: Different master cylinder pressures correspond to the corresponding pedal deformation, front bulkhead deformation, brake hose expansion, master cylinder expansion, and front and rear caliper expansion. The pedal deformation, front bulkhead deformation, brake hose expansion, master cylinder expansion, and front and rear caliper expansion under master cylinder pressure correspond to the pedal travel, thus establishing a relationship between deceleration and pedal travel through master cylinder pressure. The relationship between pedal deformation, front bulkhead deformation, brake hose expansion, master cylinder expansion, and front and rear caliper expansion and pedal travel is as follows: S=[2×(V pf +V cf +V pr +V cr )+V m / (π×D m 2 / 4)+L p +L b ——Equation 4; Where S is the pedal travel, V pf This is the expansion amount of the front brake hose, V. cf It is the front caliper expansion, V pr This refers to the expansion of the rear brake hose, V. cr It is the rear caliper expansion amount, V m It is the expansion amount of the master cylinder, L p It is the pedal deformation, L b It is the deformation of the front bulkhead.

5. A method for selecting components for a vehicle braking system according to claim 4, characterized in that, The master cylinder stroke is also affected by the master cylinder idle stroke, the front caliper idle stroke, and the rear caliper idle stroke. The relationship formula is as follows: S=[2×(V pf +V cf +V pr +V cr )+V m / ( Π ×D m 2 / 4)+L p +L b +R p × (S b +S cf ×D f 2 / D m 2 +S cr ×D r 2 / D m 2 )——Equation 5; Among them, S b It is the master cylinder idle stroke; S cf It is the front caliper's free travel; S cr This is the rear caliper's idle stroke.

6. The method for selecting components for a vehicle braking system according to claim 1, characterized in that, If the design does not meet the requirements, it is considered unreasonable. The design requirements need to be adjusted, and the adjusted braking system parameters obtained. These adjusted parameters are then input to generate a braking deceleration versus pedal force curve, which is compared with the target braking deceleration versus pedal force curve. This also includes: A braking system parameter variation model is established, which is used to generate braking system parameter adjustment rules. Based on the adjustment rules, the adjusted braking system parameters are generated.

7. A method for selecting components for a vehicle braking system according to claim 1, characterized in that, The comparison between the generated braking deceleration versus pedal force curve and the target braking deceleration versus pedal force curve also includes: Starting with the braking system parameters input into the vehicle braking system component selection mode, the process continues until a reasonable design that matches the comparison result is determined. Each comparison result is then generated into a visual file and stored for user review.

8. A selection system for vehicle braking system components, characterized in that, include: The first storage module is used to store the part parameter selection library and the part library; The acquisition module is used to acquire braking system parameters according to design requirements; A braking system parameter variation model is used to generate braking system parameter adjustment rules, and based on the adjustment rules, the adjusted braking system parameters are generated. The selection module is used to determine the corresponding parameter definitions and configurations in the parameter selection library based on the braking system parameters and the adjusted braking system parameters, and to determine the corresponding basic data of the parts library based on the determined parameter definitions and configurations in the parameter selection library. The calculation module generates a curve showing the relationship between braking deceleration and pedal force based on a mathematical model. The formula for this relationship in the mathematical model is: G = 2 × Q × R p ×R v × (D f 2 ×F f ×R f +D r 2 ×F r ×R r ) / (R t ×D m 2 ×W)——Formula 1; Where G is deceleration; Q is pedal force; R p It's the pedal ratio; R v It refers to the booster's booster ratio; D f It is the front caliper cylinder bore; F f It is the front caliper braking factor; R f It is the effective radius of the front brake disc; D r It is the rear caliper cylinder diameter; F r It is the rear caliper braking factor; R r R is the effective radius of the rear brake disc; t It is the tire rolling radius; D m W is the main cylinder bore; W is the vehicle weight. The judgment module compares the generated braking deceleration versus pedal force curve with the target braking deceleration versus pedal force curve. If they do not match, the design is deemed unreasonable. The design requirements are adjusted, and the adjusted braking system parameters are obtained. The adjusted braking system parameters are input, and the braking deceleration versus pedal force curve is generated and compared with the target braking deceleration versus pedal force curve. If they match, the design is deemed reasonable. The second storage module is used to start with the input braking system parameters and end when the comparison result is determined to be a reasonable design that matches the input parameters. It generates a visual file for each comparison result and stores it for users to view.

9. A component selection system for a vehicle braking system according to claim 8, characterized in that, The system includes a vehicle braking system component selection mode, which is installed on a host computer and used to retrieve the first storage module, the acquisition module, the braking system parameter change model, the selection module, the calculation module, the judgment module, and the second storage module to execute the vehicle braking system component selection program.

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