CN116973131A - Test method and system for acquiring braking performance parameters of braking system - Google Patents
Test method and system for acquiring braking performance parameters of braking system Download PDFInfo
- Publication number
- CN116973131A CN116973131A CN202311181989.6A CN202311181989A CN116973131A CN 116973131 A CN116973131 A CN 116973131A CN 202311181989 A CN202311181989 A CN 202311181989A CN 116973131 A CN116973131 A CN 116973131A
- Authority
- CN
- China
- Prior art keywords
- brake
- temperature variation
- value
- performance
- curve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010998 test method Methods 0.000 title claims description 15
- 238000012512 characterization method Methods 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 39
- 230000008569 process Effects 0.000 claims description 24
- 230000004044 response Effects 0.000 claims description 19
- 230000009467 reduction Effects 0.000 claims description 18
- 230000009471 action Effects 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 10
- 238000004458 analytical method Methods 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 3
- 230000001934 delay Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 17
- 230000000875 corresponding effect Effects 0.000 description 57
- 230000008859 change Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention relates to the technical field of brake system testing, in particular to a testing method and a system for acquiring brake performance parameters of a brake system.
Description
Technical Field
The invention relates to the technical field of brake system testing, in particular to a test method and a test system for acquiring brake performance parameters of a brake system.
Background
With the wide popularization and application of automobiles in life production scenes, the running safety is an important subject of automobile research, in the braking safety, an automobile braking system is a key of automobile safety running, and the running safety is directly influenced by the working state and technical condition of the automobile, so that the braking system is required to work absolutely normally during running, and good braking performance is required, besides the braking system is required to respond to the braking action of a driver in time, the braking distance is not too long during emergency braking, and the occurrence of the phenomenon of deviation is not allowed; in daily use of an automobile, a brake system fault, particularly a brake deviation phenomenon is frequently encountered, if the brake system fault is not removed in time, the running safety is seriously affected, and the research of the brake deviation in the automobile braking process is further advanced by the technicians in the related fields.
For example, chinese patent: the invention discloses a test system and a test method for acquiring braking performance parameters of a braking system, wherein the test system comprises an upper computer, four air pressure sensors, four wheel speed sensors, a GPS module, a gyroscope and a data acquisition device.
The prior art has the following problems;
in the prior art, a special test site or laboratory is required for testing the braking system, the performance of the braking system is analyzed by recording braking data generated in the process of braking at a larger speed, the testing process is dangerous, and the method is not suitable for evaluating or predicting the performance of the braking system in the actual driving process;
in the prior art, the data analysis is not carried out by collecting some dominant characteristic quantities of each brake, which are convenient to monitor, in the actual running process of the automobile, and the brake performance of a brake system cannot be estimated or predicted.
Disclosure of Invention
In order to solve the problems that in the prior art, the brake performance of a brake system is estimated or predicted by collecting some dominant characteristic quantities of each brake, which are convenient to monitor, in the braking process, and the stability detection of the brake performance of the brake system has site limitation and low applicability, the invention provides a test method and a test system for acquiring the brake performance parameters of the brake system, wherein the test method comprises the following steps:
step S1, acquiring response time delay of hydraulic changes of a brake hydraulic circuit of each brake disc in response to preset actions, wherein the preset actions are changes of hydraulic pressure of a brake master cylinder;
s2, collecting the speed reduction of the vehicle in each braking process and the temperature variation of each brake disc in the braking process, and drawing a temperature variation follow-up curve of each brake disc, wherein the temperature variation follow-up curve is a curve of the temperature variation of the brake disc along with the speed reduction;
step S3, fitting and comparing the temperature variation follow-up curves corresponding to the brake discs to calculate the difference parameters among the temperature variation follow-up curves, and screening out the corresponding temperature variation follow-up curves;
step S4, determining an analysis mode of the temperature variation follow-up curve based on the position relation of the brake disc corresponding to the screened temperature variation follow-up curve so as to judge whether the brake stability is qualified or not, wherein,
under a first position relation, calculating a first brake performance characterization value based on the characteristic data of the screened temperature variation follow-up curve, and judging whether the brake stability is qualified or not based on the first brake performance characterization value;
or under the second position relation, calculating a second brake performance characterization value based on the characteristic data of the screened temperature variation follow-up curve and the difference value of the response delay of the brake hydraulic circuit of the brake disc corresponding to the screened temperature variation follow-up curve, and judging whether the brake stability is qualified or not based on the second brake performance characterization value;
the characteristic data comprise the difference parameters among the screened temperature variation follow-up curves and the slope average value of each temperature variation follow-up curve.
Further, in the step S3, the temperature variation follow-up curves corresponding to the brake discs are fit and compared to calculate the difference parameters between the temperature variation follow-up curves, which includes,
selecting two temperature variation follow-up curves, calculating difference parameters corresponding to the two temperature variation follow-up curves, calculating the longitudinal coordinate difference values of the same abscissa on the two temperature variation follow-up curves, sorting the longitudinal coordinate difference values, screening out the maximum longitudinal coordinate difference value, and determining the maximum longitudinal coordinate difference value as the difference parameter.
Further, in the step S3, a corresponding temperature variation follow-up curve is screened out, wherein,
comparing the difference parameter with a preset difference parameter threshold,
and if the difference parameter is larger than the difference parameter threshold, screening out two temperature variation follow-up curves corresponding to the difference parameter.
Further, in the step S4, the method further includes determining a positional relationship of the brake disc corresponding to the screened temperature variation follow-up curve, wherein,
if the brake discs corresponding to the screened temperature variation follow-up curves are not on the same axis, judging that the position relationship of the brake discs corresponding to the screened temperature variation follow-up curves is a first position relationship;
and if the brake discs corresponding to the screened temperature variation follow-up curves are on the same shaft, judging that the position relationship of the brake discs corresponding to the screened temperature variation follow-up curves is the second position relationship.
Further, in the step S4, a first brake performance characteristic value is calculated according to a formula (1) based on the characteristic data of the screened temperature variation follow-up curve,
，
in the formula (1), E 1 For the first braking performance characteristic value,for the difference parameter->For a preset reference value of the difference parameter +.>For the larger value of the slope average of the temperature variation follow-up curve which has been selected, +.>Lambda is the smaller value of the average value of the slope of the temperature variation follow-up curve which is screened 1 For the first temperature weight coefficient, η 1 Lambda is the first slope weight coefficient 1 +η 1 =1。
Further, in the step S4, it is determined whether the brake stability is acceptable or not based on the first brake performance characteristic value, wherein,
comparing the first brake performance characterization value with a preset first performance characterization threshold value;
if the first brake performance representation value is smaller than or equal to the first performance representation threshold value, judging that the brake stability is qualified;
and if the first brake performance representation value is larger than the first performance representation threshold value, judging that the brake stability is unqualified.
Further, in the step S4, a second brake performance characterization value is calculated according to formula (2) based on the feature data of the screened temperature variation follow-up curve and the delay of the brake disc corresponding to the screened temperature variation follow-up curve,
，
in the formula (2),for a second brake performance characterization value, +.>For the difference value of response delay of the brake hydraulic circuit of the brake disc corresponding to the screened temperature variation follow-up curve, +.>，/>For the second temperature weight coefficient, ">For the second slope weight coefficient ε 2 For the delay weight coefficient, +.>。
Further, in the step S4, it is determined whether the brake stability is acceptable or not based on the second brake performance characteristic value, wherein,
comparing the second brake performance characterization value with a preset second performance characterization threshold value;
if the second brake performance representation value is smaller than or equal to the second performance representation threshold value, judging that the brake stability is qualified;
and if the second brake performance representation value is larger than the second performance representation threshold value, judging that the brake stability is unqualified.
Further, in the step S4, the second performance characterization threshold is smaller than the first performance characterization threshold.
Further, the invention also provides a test system for acquiring the braking performance parameters of the braking system, which comprises:
one or more processors;
a memory;
and one or more programs;
wherein the one or more programs are configured to be executed by the one or more processors, the memory comprising a storage medium storing a computer program that, when executed by the processor, is operable to perform a test method for obtaining a braking performance parameter of a braking system.
Compared with the prior art, the method has the beneficial effects that the delay of response of the hydraulic change of the hydraulic circuit of the brake to the preset action is acquired, the speed reduction of the vehicle in each braking process and the temperature change of each brake disc in the braking process are acquired, the temperature change follow-up curves of each brake disc are drawn, the temperature change follow-up curves corresponding to each brake disc are subjected to fitting comparison, the difference parameters of the temperature change follow-up curves are calculated, the temperature change follow-up curves corresponding to each brake disc are screened based on the difference parameters, the analysis mode of the temperature change follow-up curves is determined based on the position relation of the brake disc corresponding to the screened temperature change follow-up curves, whether the braking stability of the brake is qualified or not is judged, and the characterization value determination mode and the judgment standard of each analysis mode are different; furthermore, the method realizes that characteristic curves are drawn by collecting characteristic quantities of each brake in the braking process, the braking system is evaluated by comparing and screening the characteristic curves and calculating the characteristic values, the testing standard is adaptively adjusted according to the position relation of the brakes, the site limitation of the braking performance test of the braking system is broken, the testing safety is improved, and the braking deviation trend is accurately and timely detected.
In particular, the invention draws the temperature variation follow-up curve of each brake disc by collecting the speed reduction of the vehicle in each braking process and the temperature variation of each brake disc in the braking process, in the actual situation, the temperature is a key factor influencing the braking performance stability of the braking system, but the corresponding temperature variation of the brake discs at different temperatures is almost consistent under the condition that the speed reduction is the same.
In particular, the temperature variation follow-up curves corresponding to the brake discs are subjected to fitting comparison, the temperature variation follow-up curves are screened, in the actual situation, the vertical coordinate difference value between the curves is obvious under the condition that the temperature variation of the brake discs of all the wheels is reduced by the same vehicle speed, the vertical coordinate difference value is the difference value of the temperature variation of the two curves, the larger the difference value of the temperature variation is used for representing the brake discs corresponding to the two curves in the braking process, although the vehicle speed is reduced by the same amount, the larger difference exists in the temperature variation on the brake discs, whether the braking performance of a braking system is unbalanced or unstable tends or not needs to be further judged, the corresponding temperature variation follow-up curves can be screened, and further, the risky temperature variation follow-up curves are screened accurately and intuitively, and the testing method and the accuracy of the braking performance are improved.
In particular, according to the method, through the position relation of the brake discs corresponding to the screened temperature variation follow-up curve, the analysis mode of the temperature variation follow-up curve is determined to judge whether the braking stability of the brake is qualified, in the actual situation, the position relation of the brake discs corresponding to the screened temperature variation follow-up curve is different, the corresponding brake discs can be two brake discs on the same shaft of the vehicle or two brake discs on different shafts of the vehicle, the braking performance of the brake discs with different position relations is further analyzed, different standards are required to be established, and further, the accuracy of the testing method and the system of the braking performance is improved.
In particular, whether the braking stability is qualified or not is judged by calculating a first braking performance representation value under a first position relation, in the actual situation, the maximum value of the difference value of the temperature variation of the screened temperature variation follow-up curve and a preset standard value are subjected to ratio operation to represent the fluctuation similarity situation of the temperature variation of two braking discs corresponding to the screened temperature variation follow-up curve, and the larger value of the slope average value of the screened temperature variation follow-up curve and the smaller value of the slope average value of the screened temperature variation follow-up curve are subjected to ratio operation to represent the variation difference situation of the temperature variation of the two braking discs corresponding to the screened temperature variation follow-up curve.
In particular, according to the invention, whether the braking stability of the brake is qualified is judged by calculating the second braking performance representation value under the second position relation, in the actual situation, except for the fluctuation similar situation of the temperature variation and the variation difference situation of the temperature variation of the two brake discs corresponding to the screened temperature variation follow-up curve, the response delay data are required to be added into the representation value for the brake performance balance and stability test of the brake, and further, the braking deviation trend is accurately and timely detected because the brake on the same shaft can cause the inclination of the vehicle body to one side and serious accident if the braking response is asynchronous.
Drawings
FIG. 1 is a step diagram of a test method for obtaining braking performance parameters of a braking system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a brake system according to an embodiment of the present invention;
FIG. 3 is a flow chart of determining the positional relationship of a brake disc according to an embodiment of the present invention;
FIG. 4 is a flowchart for determining whether brake stability is acceptable or not in a first positional relationship of a brake disc according to an embodiment of the present invention;
FIG. 5 is a flow chart of determining whether brake stability is acceptable or not in a second position relationship of a brake disc according to an embodiment of the present invention;
in the figure, 1: brake hydraulic circuit, 2: brake master cylinder, 3: a brake disc.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 and fig. 2, fig. 1 is a step diagram of a test method for obtaining a braking performance parameter of a braking system according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of the braking system according to an embodiment of the present invention, where the test method for obtaining the braking performance parameter of the braking system according to the present invention includes:
step S1, acquiring response time delay of hydraulic changes of a brake hydraulic circuit of each brake disc in response to preset actions, wherein the preset actions are changes of hydraulic pressure of a brake master cylinder;
s2, collecting the speed reduction of the vehicle in each braking process and the temperature variation of each brake disc in the braking process, and drawing a temperature variation follow-up curve of each brake disc, wherein the temperature variation follow-up curve is a curve of the temperature variation of the brake disc 3 along with the speed reduction;
step S3, fitting and comparing the temperature variation follow-up curves corresponding to the brake discs to calculate the difference parameters among the temperature variation follow-up curves, and screening out the corresponding temperature variation follow-up curves;
step S4, determining an analysis mode of the temperature variation follow-up curve based on the position relation of the brake disc corresponding to the screened temperature variation follow-up curve so as to judge whether the brake stability is qualified or not, wherein,
under a first position relation, calculating a first brake performance characterization value based on the characteristic data of the screened temperature variation follow-up curve, and judging whether the brake stability is qualified or not based on the first brake performance characterization value;
or under the second position relation, calculating a second brake performance characterization value based on the characteristic data of the screened temperature variation follow-up curve and the difference value of the response delay of the brake hydraulic circuit of the brake disc corresponding to the screened temperature variation follow-up curve, and judging whether the brake stability is qualified or not based on the second brake performance characterization value;
the characteristic data comprise the difference parameters among the screened temperature variation follow-up curves and the slope average value of each temperature variation follow-up curve.
Specifically, as shown in fig. 2, the specific structure of the braking system is not limited in the present invention, in the prior art, the braking system mainly includes a brake master cylinder, a brake and a brake disc, where the brake master cylinder is connected with the brake and is capable of transmitting hydraulic pressure, so as to drive the brake to perform braking action on the brake disc, in actual situations, the brake master cylinder is connected with a brake pedal, the hydraulic pressure of the brake master cylinder changes after the brake pedal is driven, and the hydraulic pressure is transmitted to the brake, and the brake generates braking force through the pressure change of a hydraulic circuit, which is not described in detail in the prior art.
Specifically, the specific form of acquiring the temperature of the brake disc is not limited, and a non-contact temperature sensor can be arranged at a position capable of monitoring the temperature of the brake disc to achieve a corresponding effect, which is not described herein.
Specifically, for the construction mode of the temperature variation follow-up curve, in this embodiment, a plurality of data needs to be collected in advance, including the temperature variation of the brake disc under different speed reduction amounts in the same period, and the data is integrated, including solving the average value of the temperature variation of each temperature variation under the same speed reduction amount, thereby obtaining the corresponding relationship between the single speed reduction amount and the average value of the temperature variation, repeating the above process, obtaining the average value of the corresponding temperature variation under different speed reduction amounts, and further constructing the temperature variation follow-up curve.
Furthermore, the process can be collected in the normal driving process of the vehicle, and the brake stability can be judged by constructing a temperature variation follow-up curve through the collected data at intervals of preset time.
Specifically, the invention draws the temperature variation follow-up curve of each brake disc by collecting the speed reduction of the vehicle in each braking process and the temperature variation of each brake disc in the braking process, in actual conditions, the temperature is a key factor influencing the braking performance stability of a braking system, the corresponding temperature variation of the brake disc 3 at different temperatures is almost consistent under the condition that the speed reduction is the same, and the invention can better embody the corresponding temperature variation of the vehicle under the condition that the speed reduction is different by drawing the follow-up curve of the temperature variation varying with the speed reduction of the brake, thereby ensuring that the temperature of each wheel brake is more accurate and has characterization along with the variation of the braking process.
Specifically, in the step S3, the temperature variation follow-up curves corresponding to the brake discs are fitted and compared to calculate the difference parameters between the temperature variation follow-up curves, including,
selecting two temperature variation follow-up curves, and calculating difference parameters corresponding to the two temperature variation follow-up curvesMeasuring amountCalculating the longitudinal coordinate difference values of the same abscissa on two temperature variation follow-up curves, sorting all the longitudinal coordinate difference values, screening out the maximum longitudinal coordinate difference value, and determining the maximum longitudinal coordinate difference value as the difference parameter>。
Specifically, in the step S3, a corresponding temperature variation follow-up curve is screened out, wherein,
will be different parametersA threshold value of a difference parameter from a predetermined value>In the comparison of the two types of materials,
if the difference parameter isGreater than the difference parameter threshold value->Screening out two temperature variation follow-up curves corresponding to the difference parameters;
preferably, in the present embodiment, the difference parameter threshold valueThe value interval of (2) is [5, 15 ]]The unit is in degrees Celsius.
Specifically, the temperature variation follow-up curves corresponding to the brake discs are subjected to fitting comparison, the temperature variation follow-up curves are screened, in the actual situation, under the condition that the temperature variation follow-up curves corresponding to the brake discs 3 of the wheels are in the same vehicle speed reduction, the difference value of the vertical coordinates between the curves is obvious, the difference value of the vertical coordinates is the difference value of the temperature variation of the two curves, the larger the difference value of the temperature variation is used for representing the difference value of the temperature variation of the two curves, the larger the difference value of the temperature variation is, the larger the difference of the temperature variation on the brake discs 3 is, and whether the brake performance of a brake system is unbalanced or unstable is required to be further judged, so that the corresponding temperature variation follow-up curves can be screened, and further, the risky temperature variation follow-up curves are screened accurately and intuitively, and the accuracy of the test method and the system of the brake performance is improved.
Specifically, referring to fig. 3, which is a flowchart for determining the position relationship of the brake disc 3 according to an embodiment of the present invention, in step S4, the method further includes determining the position relationship of the brake disc corresponding to the screened temperature variation follow-up curve, wherein,
if the brake discs corresponding to the screened temperature variation follow-up curves are not on the same axis, judging that the position relationship of the brake discs corresponding to the screened temperature variation follow-up curves is a first position relationship;
and if the brake discs corresponding to the screened temperature variation follow-up curves are on the same shaft, judging that the position relationship of the brake discs corresponding to the screened temperature variation follow-up curves is the second position relationship.
Specifically, the analysis mode of the temperature variation follow-up curve is determined according to the position relation of the brake disc corresponding to the screened temperature variation follow-up curve so as to judge whether the braking stability of the brake is qualified, in the actual situation, the position relation of the brake disc corresponding to the screened temperature variation follow-up curve is different, the corresponding brake disc may be two brake discs on the same shaft of the vehicle or two brake discs on different shafts of the vehicle, the braking performance of the brake disc with different position relation is further analyzed, different standards are required to be established, and further, the accuracy of the testing method and the system of the braking performance is improved.
Specifically, referring to fig. 4, which is a flowchart for determining whether the braking stability of the brake disc is acceptable in the first positional relationship of the brake disc according to the embodiment of the present invention, in step S4, a first braking performance characterization value is calculated according to formula (1) based on the feature data of the screened temperature variation follow-up curve,
，
in the formula (1), E 1 For the first braking performance characteristic value,for the difference parameter->For the preset reference value of the difference parameter, it is preferred that in this embodiment, the +_in>，/>For the larger value of the slope average of the temperature variation follow-up curve which has been selected, +.>Lambda is the smaller value of the average value of the slope of the temperature variation follow-up curve which is screened 1 For the first temperature weight coefficient, η 1 Lambda is the first slope weight coefficient 1 +η 1 =1。
Specifically, in the step S4, it is determined whether the brake stability is acceptable or not based on the first brake performance characteristic value, wherein,
characterizing the first braking performance value E 1 With a preset first performance characterization threshold E a Comparing;
if the first brake performance indicating value E 1 Less than or equal to the first performance characterization threshold E a Judging that the braking stability is qualified;
if the first brake performance indicating value E 1 Greater than the first performance characterization threshold E a Judging that the braking stability is unqualified;
preferably, in the present embodiment, the first performance characterization threshold E a The value interval of (5) is [1.3,1.5 ]]。
Specifically, whether the brake stability is qualified or not is judged by calculating a first brake performance representation value under a first position relation, in the actual situation, the maximum value of the difference value of the temperature variation of the screened temperature variation follow-up curve and a preset standard value are subjected to ratio operation to represent the fluctuation similarity situation of the temperature variation of two brake discs corresponding to the screened temperature variation follow-up curve, and the larger value of the slope average value of the screened temperature variation follow-up curve and the smaller value of the slope average value of the screened temperature variation follow-up curve are subjected to ratio operation to represent the variation difference situation of the temperature variation of the two brake discs corresponding to the screened temperature variation follow-up curve.
Specifically, referring to fig. 5, which is a flowchart for determining whether the brake stability is acceptable in the second position relationship of the brake disc 3 according to the embodiment of the present invention, in the step S4, a second brake performance characterization value is calculated according to formula (2) based on the feature data of the screened temperature variation follow-up curve and the delay of the screened temperature variation follow-up curve corresponding to the brake disc,
，
in the formula (2),for a second brake performance characterization value, +.>For the difference value of response delay of the brake hydraulic circuit of the brake disc corresponding to the screened temperature variation follow-up curve, +.>，/>For the second temperature weight coefficient, ">For the second slope weight coefficient ε 2 For the delay weight coefficient, +.>。
Specifically, in the step S4, it is determined whether the brake stability is acceptable or not based on the second brake performance characteristic value, wherein,
characterizing the second braking performance value E 2 And a preset second performance characterization threshold E b Comparing;
if the second brake performance representation value E 2 Less than or equal to the second performance characterization threshold E b Judging that the braking stability is qualified;
if the second brake performance representation value E 2 Greater than the second performance characterization threshold E b Judging that the braking stability is unqualified;
preferably, in the present embodiment, the second performance characterization threshold E b The value interval of (2) is [1.15,1.25 ]]。
Specifically, whether the braking stability of the brake is qualified or not is judged by calculating the second braking performance representation value under the second position relation, in the actual situation, in addition to the fluctuation similar situation of the temperature variation and the variation difference situation of the temperature variation of the two brake discs corresponding to the screened temperature variation follow-up curve, response delay data are required to be added into the representation value for the brake disc 3 on the same shaft, and further, the braking deviation trend is accurately and timely detected because the brake on the same shaft can cause the inclination of the vehicle body to one side when the braking response is asynchronous, and serious accident is caused.
Specifically, in the step S4, the second performance characterization threshold E b Less than the first performance characterization threshold E a 。
Specifically, the invention also provides a test system for acquiring the braking performance parameters of the braking system, which comprises the following steps:
one or more processors;
a memory;
and one or more programs;
wherein the one or more programs are configured to be executed by the one or more processors, the memory comprising a storage medium storing a computer program that, when executed by the processor, is operable to perform a test method for obtaining a braking performance parameter of a braking system.
Specifically, the processors are further connected with a hydraulic sensor for acquiring the time delay of the hydraulic change of the brake hydraulic circuit 1 in response to a preset action, a temperature sensor for acquiring the temperature of each brake disc and a speed sensor for acquiring the speed of the vehicle, and are used for acquiring the data of various sensors and analyzing and processing the data.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A test method for obtaining a braking performance parameter of a braking system, comprising:
step S1, acquiring response time delay of hydraulic changes of a brake hydraulic circuit of each brake disc in response to preset actions, wherein the preset actions are changes of hydraulic pressure of a brake master cylinder;
s2, collecting the speed reduction of the vehicle in each braking process and the temperature variation of each brake disc in the braking process, and drawing a temperature variation follow-up curve of each brake disc, wherein the temperature variation follow-up curve is a curve of the temperature variation of the brake disc along with the speed reduction;
step S3, fitting and comparing the temperature variation follow-up curves corresponding to the brake discs to calculate the difference parameters among the temperature variation follow-up curves, and screening out the corresponding temperature variation follow-up curves;
step S4, determining an analysis mode of the temperature variation follow-up curve based on the position relation of the brake disc corresponding to the screened temperature variation follow-up curve so as to judge whether the brake stability is qualified or not, wherein,
under a first position relation, calculating a first brake performance characterization value based on the characteristic data of the screened temperature variation follow-up curve, and judging whether the brake stability is qualified or not based on the first brake performance characterization value;
or under the second position relation, calculating a second brake performance characterization value based on the characteristic data of the screened temperature variation follow-up curve and the difference value of the response delay of the brake hydraulic circuit of the brake disc corresponding to the screened temperature variation follow-up curve, and judging whether the brake stability is qualified or not based on the second brake performance characterization value;
the characteristic data comprise the difference parameters among the screened temperature variation follow-up curves and the slope average value of each temperature variation follow-up curve.
2. The method for obtaining braking performance parameters of a braking system according to claim 1, wherein in the step S3, fitting and comparing the temperature variation follow-up curves corresponding to the brake discs to calculate the difference parameters between the temperature variation follow-up curves, including,
selecting two temperature variation follow-up curves, calculating difference parameters corresponding to the two temperature variation follow-up curves, calculating the longitudinal coordinate difference values of the same abscissa on the two temperature variation follow-up curves, sorting the longitudinal coordinate difference values, screening out the maximum longitudinal coordinate difference value, and determining the maximum longitudinal coordinate difference value as the difference parameter.
3. The method for obtaining braking performance parameters of a braking system according to claim 2, wherein in the step S3, a corresponding temperature variation follow-up curve is screened out, wherein,
comparing the difference parameter with a preset difference parameter threshold,
and if the difference parameter is larger than the difference parameter threshold, screening out two temperature variation follow-up curves corresponding to the difference parameter.
4. The method for obtaining brake performance parameters of a brake system according to claim 3, wherein in step S4, the method further comprises determining a positional relationship of a brake disc corresponding to the screened temperature variation follow-up curve, wherein,
if the brake discs corresponding to the screened temperature variation follow-up curves are not on the same axis, judging that the position relationship of the brake discs corresponding to the screened temperature variation follow-up curves is a first position relationship;
and if the brake discs corresponding to the screened temperature variation follow-up curves are on the same shaft, judging that the position relationship of the brake discs corresponding to the screened temperature variation follow-up curves is the second position relationship.
5. The method for obtaining brake performance parameters of a brake system according to claim 4, wherein in the step S4, a first brake performance characteristic value is calculated according to formula (1) based on the feature data of the screened temperature variation follow-up curve,
，
in the formula (1), E 1 For the first braking performance characteristic value,for the difference parameter->For a preset reference value of the difference parameter +.>For the larger value of the slope average of the temperature variation follow-up curve which has been selected, +.>Lambda is the smaller value of the average value of the slope of the temperature variation follow-up curve which is screened 1 For the first temperature weight coefficient, η 1 Lambda is the first slope weight coefficient 1 +η 1 =1。
6. The method according to claim 5, wherein in the step S4, whether the brake stability is acceptable is determined based on the first brake performance characteristic value, wherein,
comparing the first brake performance characterization value with a preset first performance characterization threshold value;
if the first brake performance representation value is smaller than or equal to the first performance representation threshold value, judging that the brake stability is qualified;
and if the first brake performance representation value is larger than the first performance representation threshold value, judging that the brake stability is unqualified.
7. The method for obtaining brake performance parameters of a brake system according to claim 6, wherein in the step S4, a second brake performance characteristic value is calculated according to formula (2) based on the characteristic data of the screened temperature variation follow-up curve and the difference of response delays of the brake hydraulic circuit of the brake disc corresponding to the screened temperature variation follow-up curve,
，
in the formula (2),for a second brake performance characterization value, +.>For the difference value of response delay of the brake hydraulic circuit of the brake disc corresponding to the screened temperature variation follow-up curve, +.>，/>For the second temperature weight coefficient, ">For the second slope weight coefficient ε 2 For the delay weight coefficient, +.>。
8. The method according to claim 7, wherein in the step S4, it is determined whether the brake stability is acceptable based on the second brake performance characteristic value, wherein,
comparing the second brake performance characterization value with a preset second performance characterization threshold value;
if the second brake performance representation value is smaller than or equal to the second performance representation threshold value, judging that the brake stability is qualified;
and if the second brake performance representation value is larger than the second performance representation threshold value, judging that the brake stability is unqualified.
9. The method according to claim 8, wherein in the step S4, the second performance characterization threshold is smaller than the first performance characterization threshold.
10. A computer device for use in a test method for obtaining braking performance parameters of a braking system according to any one of claims 1 to 9, comprising:
one or more processors;
a memory;
and one or more programs;
wherein the one or more programs are configured to be executed by the one or more processors, the memory comprising a storage medium storing a computer program that, when executed by the processor, is operable to perform a test method for obtaining a braking performance parameter of a braking system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311181989.6A CN116973131B (en) | 2023-09-14 | 2023-09-14 | Test method and system for acquiring braking performance parameters of braking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311181989.6A CN116973131B (en) | 2023-09-14 | 2023-09-14 | Test method and system for acquiring braking performance parameters of braking system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116973131A true CN116973131A (en) | 2023-10-31 |
| CN116973131B CN116973131B (en) | 2023-12-08 |
Family
ID=88485237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311181989.6A Active CN116973131B (en) | 2023-09-14 | 2023-09-14 | Test method and system for acquiring braking performance parameters of braking system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116973131B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6256837A (en) * | 1985-09-06 | 1987-03-12 | Unyusho Senpaku Gijutsu Kenkyusho | Testing method for braking force of automobile |
| JP2002048686A (en) * | 2000-08-07 | 2002-02-15 | Meidensha Corp | Test system of brake for vehicle |
| WO2005097572A1 (en) * | 2004-04-10 | 2005-10-20 | Daimlerchrysler Ag | Method for determining brake characteristic values, and brake control system |
| KR20060038281A (en) * | 2004-10-29 | 2006-05-03 | 한국타이어 주식회사 | Bead performance testing apparatus of tbr tire |
| JP2006205960A (en) * | 2005-01-31 | 2006-08-10 | Toyota Motor Corp | Abnormality detection device and abnormality detection method for brake pressure control system |
| JP2008056185A (en) * | 2006-09-01 | 2008-03-13 | Toyota Motor Corp | Brake abnormality detection system, brake temperature detection system, and brake control system |
| CN101823482A (en) * | 2010-05-28 | 2010-09-08 | 冯兵 | Diagnosis system for vehicle braking system and diagnosis method |
| CN111458157A (en) * | 2020-04-14 | 2020-07-28 | 上汽依维柯红岩商用车有限公司 | Test system and method for obtaining braking performance parameters of braking system |
| CN114878182A (en) * | 2022-04-29 | 2022-08-09 | 东风汽车股份有限公司 | Automobile brake system heat fading performance test method |
| CN115508112A (en) * | 2022-11-23 | 2022-12-23 | 北京车讯互联网股份有限公司 | Method, system and medium for testing vehicle brake performance |
| CN115586130A (en) * | 2022-09-27 | 2023-01-10 | 山东金力新材料科技股份有限公司 | Brake shoe friction coefficient consistency detection equipment |
-
2023
- 2023-09-14 CN CN202311181989.6A patent/CN116973131B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6256837A (en) * | 1985-09-06 | 1987-03-12 | Unyusho Senpaku Gijutsu Kenkyusho | Testing method for braking force of automobile |
| JP2002048686A (en) * | 2000-08-07 | 2002-02-15 | Meidensha Corp | Test system of brake for vehicle |
| WO2005097572A1 (en) * | 2004-04-10 | 2005-10-20 | Daimlerchrysler Ag | Method for determining brake characteristic values, and brake control system |
| KR20060038281A (en) * | 2004-10-29 | 2006-05-03 | 한국타이어 주식회사 | Bead performance testing apparatus of tbr tire |
| JP2006205960A (en) * | 2005-01-31 | 2006-08-10 | Toyota Motor Corp | Abnormality detection device and abnormality detection method for brake pressure control system |
| JP2008056185A (en) * | 2006-09-01 | 2008-03-13 | Toyota Motor Corp | Brake abnormality detection system, brake temperature detection system, and brake control system |
| CN101823482A (en) * | 2010-05-28 | 2010-09-08 | 冯兵 | Diagnosis system for vehicle braking system and diagnosis method |
| CN111458157A (en) * | 2020-04-14 | 2020-07-28 | 上汽依维柯红岩商用车有限公司 | Test system and method for obtaining braking performance parameters of braking system |
| CN114878182A (en) * | 2022-04-29 | 2022-08-09 | 东风汽车股份有限公司 | Automobile brake system heat fading performance test method |
| CN115586130A (en) * | 2022-09-27 | 2023-01-10 | 山东金力新材料科技股份有限公司 | Brake shoe friction coefficient consistency detection equipment |
| CN115508112A (en) * | 2022-11-23 | 2022-12-23 | 北京车讯互联网股份有限公司 | Method, system and medium for testing vehicle brake performance |
Non-Patent Citations (3)
| Title |
|---|
| 冯如只 等: "汽车制动性能测试系统研究", 武汉理工大学学报(交通科学与工程版), no. 01 * |
| 刘海江 等: "液压式汽车制动系统的性能测试方案的研究", 装备制造技术, no. 05 * |
| 周国宪: "基于多物理量的制动性能测试系统研究", 中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116973131B (en) | 2023-12-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10690695B2 (en) | System and method for detecting driving behavior | |
| EP1767422B1 (en) | Method and apparatus for evaluating a cornering stability of a wheel | |
| JP2005528270A (en) | Vehicle tire and vehicle monitoring method, vehicle / tire correlation model generation method, vehicle diagnostic system | |
| CN112881014B (en) | Offline NVH (noise, vibration and harshness) testing system and method of transmission assembly | |
| WO2009048347A1 (en) | Continuous monitoring system for application in shock absorbers | |
| CN116934303B (en) | Temperature and humidity resistant polyurethane adhesive performance detection system for new energy automobile battery packaging | |
| CN112848816B (en) | Tire pressure detection method, tire pressure detection equipment, storage medium and tire pressure detection device based on pressure sensor | |
| US20100324858A1 (en) | Method and device for determining the change in the footprint of a tire | |
| Yang et al. | Experimental investigation of tire dynamic strain characteristics for developing strain-based intelligent tire system | |
| CN113382883B (en) | Method for estimating the pressure of a tyre of a vehicle | |
| CA2363917C (en) | Method and apparatus for estimating tire air pressure | |
| JP3724892B2 (en) | Tire pressure drop detection method and apparatus | |
| CN106828106A (en) | A kind of fault early warning method towards EMUs traction electric machine | |
| CN112829526A (en) | Tire wear degree monitoring method and system | |
| CN113607251A (en) | Vehicle load measuring method and device | |
| CN117249913B (en) | Automobile hub bearing temperature monitoring alarm system | |
| CN116973131B (en) | Test method and system for acquiring braking performance parameters of braking system | |
| CN114414024A (en) | Monitoring method and device for vehicle-mounted weighing system, storage medium and electronic device | |
| KR102198725B1 (en) | Vehicle driving safety parts self-diagnostic apparatus | |
| CN116736138A (en) | Power battery monitoring method and device, readable storage medium and electronic equipment | |
| CN115163708B (en) | Real-time detection method and device for temperature of brake disc | |
| Pana et al. | Study on vehicle operating safe state monitoring parameter and measurement model | |
| CN108827607B (en) | Safety monitoring method and monitoring device suitable for various steel structures | |
| JP5112730B2 (en) | Tire durability performance prediction method, tire durability performance prediction device, and tire durability performance prediction program | |
| CN112013938A (en) | Vehicle load detection method and vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |