CN113624677A - Attachment coefficient utilization rate testing method, system, equipment and storage medium - Google Patents
Attachment coefficient utilization rate testing method, system, equipment and storage medium Download PDFInfo
- Publication number
- CN113624677A CN113624677A CN202110799751.4A CN202110799751A CN113624677A CN 113624677 A CN113624677 A CN 113624677A CN 202110799751 A CN202110799751 A CN 202110799751A CN 113624677 A CN113624677 A CN 113624677A
- Authority
- CN
- China
- Prior art keywords
- braking
- vehicle
- wheel
- shaft
- control system
- 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
- 238000012360 testing method Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 claims abstract description 78
- 238000004891 communication Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims description 7
- 238000010998 test method Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention provides a method for testing the utilization rate of an adhesion coefficient, which comprises the steps of establishing communication with a control system of a tested vehicle; selecting a single wheel shaft of a detected vehicle as a single-shaft brake wheel shaft and generating a single-shaft brake control command, and simultaneously setting a plurality of slip rates to be detected to generate a plurality of target slip rates corresponding to the single-shaft brake control command; the method comprises the steps that a single-shaft braking control instruction and a target slip rate are sent to a vehicle control system one by one, a plurality of braking times of a tested vehicle for braking respectively based on the single-shaft braking control instruction and the target slip rates are obtained respectively, and an optimal braking time is obtained based on the braking times; and switching other wheel shafts of the tested vehicle one by one until the optimal braking time of each wheel shaft is obtained so as to calculate the utilization rate of the adhesion coefficient. The method utilizes a vehicle control system of a decoupling braking system, realizes single-shaft braking by sending a control instruction to the vehicle control system, and also realizes automatic testing of the utilization rate of the adhesion coefficient by the computing capability of the vehicle control system on the wheel speed and the slip rate of the wheel.
Description
Technical Field
The invention relates to the field of vehicle detection, in particular to a method, a system, equipment and a storage medium for testing the utilization rate of an adhesion coefficient.
Background
The adhesion coefficient utilization rate Epsilon (Epsilon) is an important brake system parameter required by regulations such as GB21670(5.6.4) and ECE-R13h, and the like, and whether the adhesion coefficient provided by the brake system to the ground is fully utilized or not is mainly examined (the regulation requires Epsilon to be more than or equal to 75%).
The traditional testing method is that a tee joint is added through a brake pipeline, or an ESC module is used for controlling a front axle and a rear axle to brake independently, the braking time of 40km/h to 20km/h is measured and used for calculating the braking strength, and finally the braking strength is used for measuring and calculating the ground adhesion coefficient.
However, in the implementation process of the test method, the tee joint needs to be added or the ESC module needs to be used for single-shaft braking, the operation process is troublesome, and the efficiency is low.
Disclosure of Invention
In view of the foregoing problems in the prior art, an object of the present invention is to provide a method, a system, a device, and a storage medium for testing an adhesion coefficient utilization rate, where the testing method performs control logic innovation based on a vehicle control system of a decoupled braking system, and performs individual braking of each wheel axle by controlling the control system of a vehicle to be tested, so as to obtain an optimal braking time for calculating the adhesion coefficient utilization rate. The method specifically comprises the following steps:
s1, establishing communication with a control system of a detected vehicle;
s2, selecting a single wheel shaft of the vehicle to be tested as a single-shaft brake wheel shaft, generating a single-shaft brake control command, and simultaneously setting a plurality of slip rates to be tested to generate a plurality of target slip rates corresponding to the single-shaft brake control command;
s3, when the speed of the vehicle is increased to a preset value, sending a single-shaft brake control instruction and a target slip rate to the vehicle control system one by one, and respectively obtaining a plurality of brake times of a detected vehicle fed back by the vehicle control system and respectively braked based on the single-shaft brake control instruction and the target slip rates;
s4, acquiring the minimum value of the plurality of braking time as the optimal braking time;
s5, returning to S2 to switch other wheel shafts of the detected vehicle one by one to be used as single-shaft brake wheel shafts until the optimal braking time of each wheel shaft as the single-shaft brake wheel shaft is obtained;
and S6, obtaining the utilization rate of the adhesion coefficient based on the obtained optimal braking time for the independent braking of each wheel axle.
Further, the specific process of acquiring the plurality of braking times in step S3 is as follows:
the method comprises the steps that a slip rate in the braking process is obtained in real time on the basis of detection of a vehicle control system on the wheel speed in the braking process, and the wheel cylinder pressure of a wheel shaft of a brake is controlled through the deviation of the slip rate in the braking process and the target slip rate so as to keep the wheel shaft to brake according to the target slip rates; and the number of the first and second groups,
and respectively acquiring the braking time of the detected vehicle from the first preset vehicle speed to the second preset vehicle speed based on the detection and the record of the vehicle control system on the vehicle speed in the braking process.
Preferably, the controlling of the wheel cylinder pressure of the braked wheel shaft by the deviation of the braking process slip ratio from the target slip ratio includes:
when the slip rate in the braking process is higher than the preset upper limit of the target slip rate, controlling the pressure reducing unit to regulate and control the wheel cylinder pressure of the target brake wheel shaft through the vehicle control system;
and when the slip rate in the braking process is higher than the preset lower limit of the target slip rate, controlling the pressure boosting unit to regulate and control the wheel cylinder pressure of the target brake wheel shaft through the vehicle control system.
Preferably, the specific manner of setting the slip ratios to be measured in step S2 is as follows: and taking the minimum value of the slip ratio as an initial value in the test interval, and gradually increasing according to a set gradient until the test interval of the slip ratio is traversed.
In a second aspect, the present invention further provides a system for testing adhesion coefficient utilization, the system comprising:
the communication module is used for establishing a command transmission and information interaction communication path with the vehicle control system;
the wheel shaft switching module is used for selecting single wheel shafts from wheel shafts of the detected vehicle one by one to serve as single-shaft brake wheel shafts;
the single-axle brake control module is used for sending a single-axle brake control command to the vehicle control system so as to perform single-axle braking according to a set wheel axle;
the slip rate control module is used for issuing target slip rates to the vehicle control system one by one so as to enable the single-shaft brake vehicle wheel shaft to brake gradually according to the set slip rates;
the braking time analysis module is used for receiving the braking time recorded and fed back by the vehicle control system and acquiring the optimal braking time of each wheel axle based on the braking time;
and the adhesion coefficient utilization rate calculation module is used for receiving the optimal braking time fed back by the braking time analysis module and obtaining the adhesion coefficient utilization rate according to a set calculation rule.
Preferably, the test system further comprises a display control module for displaying the control interface, the process parameters and the test results in the test process.
In a third aspect of the invention, an electronic device is provided, comprising a processor and a memory;
the memory having stored therein at least one instruction or a set of codes for at least one program;
the at least one instruction or at least one code set of a program is loaded and executed by the processor, so as to implement the method for testing the utilization rate of the attachment coefficient according to any one of the above descriptions.
Preferably, the electronic equipment further comprises a display and an input device, wherein the display is used for displaying the process parameters related to the test method and the test results; the input device is a touch input device or a key input device.
In a fourth aspect of the present invention, a storage medium is provided, which includes instructions that, when run on an electronic device, cause the electronic device to execute the above-mentioned method for testing the adhesion coefficient utilization.
By adopting the technical scheme, the method, the system, the equipment and the storage medium for testing the utilization rate of the adhesion coefficient have the following beneficial effects:
1. according to the method for testing the utilization rate of the adhesion coefficient, the characteristic that a brake main cylinder and a booster cylinder of a decoupling brake system are decoupled is utilized, control instructions are sent to an ECU control system to realize control of single-shaft braking, and optimal braking time is obtained through the processing of wheel speed and the calculation capacity of slip rate of wheels, so that the optimal braking time is used for calculating the utilization rate of the adhesion coefficient.
2. The invention provides a system for testing the utilization rate of an attachment coefficient, which can be used for automatically testing the utilization rate of the attachment coefficient.
3. The electronic equipment provided by the invention is loaded with relevant instructions or codes of the attachment coefficient utilization rate testing method and can be used as the attachment coefficient utilization rate testing equipment.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a logic diagram of an adhesion coefficient utilization testing method according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for testing an adhesion coefficient utilization rate by an upper computer according to an embodiment of the present invention;
fig. 3 is an application architecture diagram for performing an adhesion coefficient utilization rate test by using an upper computer test system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
Example 1
As shown in fig. 1, the present embodiment provides a logic diagram of a method for testing an adhesion coefficient utilization ratio, and the specific process includes:
s1, establishing communication with a control system of a detected vehicle; the vehicle control system of the present invention refers to an ECU control system;
s2, selecting a single wheel shaft of the vehicle to be tested as a single-shaft brake wheel shaft, generating a single-shaft brake control command, and simultaneously setting a plurality of slip rates to be tested to generate a plurality of target slip rates corresponding to the single-shaft brake control command; the specific mode for setting a plurality of slip rates to be measured is as follows: and taking the minimum value of the slip ratio as an initial value in the test interval, and gradually increasing according to a set gradient until the test interval of the slip ratio is traversed.
S3, when the speed of the vehicle is increased to a preset value, sending a single-shaft brake control instruction and a target slip rate to the ECU control system one by one, and respectively obtaining a plurality of brake times of the tested vehicle fed back by the ECU control system and respectively braked based on the single-shaft brake control instruction and the plurality of target slip rates; specifically, the specific process of acquiring the plurality of braking times is as follows:
the method comprises the steps that a slip rate in the braking process is obtained in real time on the basis of detection of an ECU (electronic control unit) control system on the wheel speed in the braking process, and the wheel cylinder pressure of a wheel shaft of a brake is controlled through the deviation of the slip rate in the braking process and the target slip rate, so that the wheel shaft is kept to brake according to the target slip rates; and the number of the first and second groups,
and respectively acquiring the braking time of the detected vehicle from the first preset vehicle speed to the second preset vehicle speed based on the detection and the record of the ECU control system on the vehicle speed in the braking process.
In an implementation, the controlling the wheel cylinder pressure of the braked wheel shaft through the deviation of the braking process slip ratio and the target slip ratio specifically comprises:
when the slip rate in the braking process is higher than the preset upper limit of the target slip rate, controlling a pressure reducing unit to regulate and control the wheel cylinder pressure of a target brake wheel shaft through the ECU control system;
and when the slip rate in the braking process is higher than the preset lower limit of the target slip rate, controlling the pressure boosting unit to regulate and control the wheel cylinder pressure of the target brake wheel shaft through the ECU control system.
S4, acquiring the minimum value of the plurality of braking time as the optimal braking time;
it should be noted that, the minimum value obtaining mode may be further configured to obtain a minimum value of the plurality of braking times, select three test values between the minimum value and a minimum value of 1.05 times with the minimum value as a reference point, and take an arithmetic average value thereof as the optimal braking time. One skilled in the art can select one of the ways to obtain the minimum value in S4 as the optimal braking time based on the test situation.
In one embodiment of the invention, it may be provided that: the testing interval of the slip rate is 10% -20%, 11 slip rates to be tested (including 10%, 11%, 12%. 20%) are obtained by adjusting gradually according to the gradient of 1%, 11 target slip rates corresponding to the single-shaft brake control command are correspondingly generated, in the testing process, the target slip rates are issued to an ECU control system of the tested vehicle gradually, the ECU control system controls a decoupling brake system to execute a single shaft according to the target slip rates, and after 11 tests are completed, 11 brake times corresponding to the 11 target slip rates are obtained and uploaded to the testing system; and the test system acquires the minimum value from the 11 braking time as the optimal braking time.
S5, returning to the step S2 to switch other wheel shafts of the tested vehicle one by one to be used as single-shaft brake wheel shafts until the optimal braking time of each wheel shaft as the single-shaft brake wheel shaft is obtained;
the step is a cyclic test process, the number of cycles depends on the number of wheel axles of the vehicle to be tested, taking the vehicle to be tested with a front axle and a rear axle as an example, the front axle is selected as a single-axle brake wheel axle in the first S2, after the optimal braking time of the front axle is obtained, the step S2 is returned, and the repeated test process of selecting the rear axle as the single-axle brake wheel axle is completed. If the tested vehicle also comprises a middle axle or more other wheel axles, multiple cycles are needed until the test process that each wheel axle of the tested vehicle is used as a single-axle brake wheel axle is completed.
And S6, obtaining the utilization rate of the adhesion coefficient based on the obtained optimal braking time for the independent braking of each wheel axle.
It should be noted that, the specific calculation rule is set with reference to the calculation process of the road surface adhesion coefficient utilization rate of GB21670, and the calculation rule can be set for the tested vehicle equipped with the class 1, class 2 anti-lock brake system according to the following parameters and calculation relationships:
for clarity of description, the optimal braking time in this embodiment is tmShowing a single-axis system at the front axleWhen the vehicle is in motion, the braking time analysis module acquires the optimal braking time t of the front axlem(ii) a Correspondingly, when the rear axle is braked in a single shaft, the braking time analysis module obtains the optimal braking time t of the rear axlem。
Calculating the braking intensity of the front axle and the rear axle, and obtaining the optimal braking time t through the front axlemAnd rear axle optimum braking time tmObtaining the braking strength of the front axle and the rear axle respectively:
calculating dynamic axle load of the power machine according to the measured braking strength and rolling resistance of non-braking wheels, taking a two-axle vehicle driven by a rear axle as an example:
when the front axle is braked, the brake is carried out,
Ff＝zm×P×g-0.015 F2
front axle dynamic axle load:
when the rear axle is braked, the brake is started,
Fr＝zm×P×g-0.010 F1
dynamic axle load of the rear axle:
wherein z isALCalculating the maximum braking strength: braking at an initial speed of 55km/h, measuring the time from 45km/h to 15km/h, and ensuring the full circulation of the anti-lock braking system in the braking process. Taking the average value t of three testsmObtained by the following formula:
respectively calculating the adhesion coefficient of the front shaft and the rear shaft and the adhesion coefficient of the whole vehicle, wherein the k value is rounded to a thousandth:
front axle adhesion coefficient:
coefficient of rear axle adhesion
For the tested vehicle equipped with the class 1 and 2 anti-lock brake system,
adhesion coefficient utilization ratio:
where P is the vehicle weight, g is the gravitational acceleration, F1 is the front axle weight, F2 is the rear axle weight, h is the height of the center of gravity of the vehicle, and E is the wheelbase of the vehicle.
In particular, the calculation rules of the adhesion coefficient utilization calculation module are not limited to the rules listed here for assembling the type 1 and type 2 anti-lock brake systems, but may also be calculation rules of other types of anti-lock brake systems set with reference to the specifications of the road adhesion coefficient utilization of GB 21670.
In particular, the maximum braking intensity zALThe data can be obtained by testing in advance and is prestored in an attachment coefficient utilization rate calculation module of the upper computer, and the data can also be obtained by adjusting the range test of the braking speed on the basis of the upper computer of the embodiment.
Example 2
The embodiment provides an embodiment of an upper computer test system, the upper computer test system completes the test of the utilization rate of the adhesion coefficient of the tested vehicle by executing the method of embodiment 1, and the upper computer test system of the embodiment can realize the automatic test of the utilization rate of the adhesion coefficient based on an ECU control system of a decoupling braking system. The specific way of implementing the test method and completing the utilization rate of the adhesion coefficient of the tested vehicle by the upper computer test system is described in detail as follows:
fig. 3 is a diagram of an application architecture of an embodiment of an adhesion coefficient utilization test using the upper computer test system of the present invention, which shows the upper computer test system of the present invention and relevant modules of a vehicle under test, wherein,
the tested vehicle is provided with a decoupled braking system, the ECU control system can control the decoupled braking system to execute a braking process, the decoupled braking system has the characteristic of decoupling a main braking cylinder and a power cylinder, active linear pressurization can be carried out through the power cylinder independently, and independent control of four wheels is realized; meanwhile, the ECU control system also has the capability of processing the wheel speed and calculating the slip rate.
The upper computer testing system comprises a communication module, a wheel axle switching module, a single-axle braking control module, a slip rate control module, a braking time analysis module and an adhesion coefficient utilization rate calculation module. In order to better explain the test system and the test method of the embodiment, a flowchart of an embodiment of the method for testing the utilization rate of the attachment coefficient by using an upper computer shown in fig. 2 is specifically explained:
when a test is started, the upper computer test system establishes a communication path with the ECU control system of the vehicle to be tested through the communication module, the communication mode provided in this embodiment is UDS communication, and the communication module establishes UDS communication connection with the ECU control system and is used for establishing instruction transmission and information interaction with the ECU control system of the vehicle to be tested.
And selecting a braking wheel shaft through a wheel shaft switching module to generate a single-shaft braking control command and correspondingly generating a plurality of target slip rates.
When the vehicle speed is increased to a preset vehicle speed, a single-shaft brake control instruction is issued to an ECU control system of the detected vehicle through a single-shaft brake control module, and meanwhile, a target slip rate is issued to the ECU control system of the detected vehicle through a slip rate control module.
And the ECU control system of the tested vehicle receives the single-shaft brake control command and controls the decoupling brake system to realize that the tested vehicle performs single-shaft brake according to the target slip rate. Specifically, an ECU control system is used for detecting the wheel speed in the braking process, the slip rate in the braking process is obtained from time to time, and the wheel cylinder pressure of a braking wheel shaft is controlled through the deviation of the slip rate in the braking process and the target slip rate so as to keep the wheel shaft braking according to the target slip rate. To achieve this, one possible way is: when the slip rate in the braking process is detected to be higher than the preset upper limit of the target slip rate, controlling a pressure reducing unit to regulate and control the wheel cylinder pressure of a target brake wheel shaft through the ECU control system; and when the slip rate in the braking process is higher than the preset lower limit of the target slip rate, controlling the pressure boosting unit to regulate and control the wheel cylinder pressure of the target brake wheel shaft through the ECU control system.
Particularly, the ECU control system of the tested vehicle simultaneously obtains the braking time in the front axle braking process, and feeds the obtained braking time back to the braking time analysis module. The implementation process is that the ECU control system can detect the speed of the vehicle in the braking process, record and feed back the braking time of the detected vehicle from a first preset speed to a second preset speed, wherein the first preset speed is 40km/h, and the second preset speed is 20 km/h.
And the braking time analysis module is used for receiving the braking time recorded and fed back by the ECU control system and acquiring the optimal braking time of each wheel axle based on the braking time.
And the adhesion coefficient utilization rate calculation module is used for receiving the optimal braking time fed back by the braking time analysis module and obtaining the adhesion coefficient utilization rate according to a set calculation rule.
The upper computer control system can respectively acquire the optimal braking time of the front axle, the adhesion coefficient of the front axle, the optimal braking time of the rear axle, the adhesion coefficient of the rear axle and the adhesion coefficient of the whole vehicle, and then the maximum braking intensity z is combinedALThe test data of (a) is finally calculated to obtain the attachmentCoefficient utilization Epsilon (Epsilon).
Example 3
Embodiment 3 of the present invention further provides an electronic device on the basis of embodiment 1, including a processor and a memory; the memory having stored therein at least one instruction or a set of codes for at least one program; the at least one instruction or the at least one program code set is loaded and executed by the processor for use in the testing method of embodiment 1.
In an optional embodiment, the testing device further comprises a display and an input device, wherein the display is used for displaying the process parameters related to the testing method and the testing results, and the input device is a touch input device or a key input device.
The electronic device of the embodiment can establish communication with the vehicle to be tested through the UDS communication protocol, and a tester can test the utilization rate of the adhesion coefficient through the electronic device of the embodiment.
Example 4
Embodiment 4 of the present invention provides a storage medium including instructions that, when run on an electronic device, cause the electronic device to perform a method for testing adhesion coefficient utilization described in embodiment 1.
Since the instructions can be used to calculate the adhesion coefficient utilization, the storage medium can thus perform the calculation of the adhesion coefficient utilization when running on the electronic device.
While the invention has been described with reference to specific embodiments, it will be appreciated by those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the invention can be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. A method for testing the utilization rate of an adhesion coefficient is characterized in that the method for testing the utilization rate of the adhesion coefficient is based on a vehicle control system of a decoupling braking system, and comprises the following steps:
s1, establishing communication with a control system of a detected vehicle;
s2, selecting a single wheel shaft of the vehicle to be tested as a single-shaft brake wheel shaft, generating a single-shaft brake control command, and simultaneously setting a plurality of slip rates to be tested to generate a plurality of target slip rates corresponding to the single-shaft brake control command;
s3, when the speed of the vehicle is increased to a preset value, sending a single-shaft brake control instruction and a target slip rate to the vehicle control system one by one, and respectively obtaining a plurality of brake times of a detected vehicle fed back by the vehicle control system and respectively braked based on the single-shaft brake control instruction and the target slip rates;
s4, acquiring the minimum value of the plurality of braking time as the optimal braking time;
s5, returning to S2 to switch other wheel shafts of the detected vehicle one by one to be used as single-shaft brake wheel shafts until the optimal braking time of each wheel shaft as the single-shaft brake wheel shaft is obtained;
and S6, obtaining the utilization rate of the adhesion coefficient based on the obtained optimal braking time for the independent braking of each wheel axle.
2. The method for testing the utilization rate of the adhesion coefficient according to claim 1, wherein the specific process of obtaining the plurality of braking times in step S3 is as follows:
the method comprises the steps that a slip rate in the braking process is obtained in real time on the basis of detection of a vehicle control system on the wheel speed in the braking process, and the wheel cylinder pressure of a wheel shaft of a brake is controlled through the deviation of the slip rate in the braking process and the target slip rate so as to keep the wheel shaft to brake according to the target slip rates; and the number of the first and second groups,
and respectively acquiring the braking time of the detected vehicle from the first preset vehicle speed to the second preset vehicle speed based on the detection and the record of the vehicle control system on the vehicle speed in the braking process.
3. The method for testing the adhesion coefficient utilization rate according to claim 2, wherein the wheel cylinder pressure of the braked wheel axle is controlled by the deviation between the braking process slip rate and the target slip rate, specifically:
when the slip rate in the braking process is higher than the preset upper limit of the target slip rate, controlling the pressure reducing unit to regulate and control the wheel cylinder pressure of the target brake wheel shaft through the vehicle control system;
and when the slip rate in the braking process is higher than the preset lower limit of the target slip rate, controlling the pressure boosting unit to regulate and control the wheel cylinder pressure of the target brake wheel shaft through the vehicle control system.
4. The method for testing the utilization rate of the adhesion coefficient according to claim 1, wherein the setting of the slip rates to be tested in step S2 is performed by: and taking the minimum value of the slip ratio as an initial value in the test interval, and gradually increasing according to a set gradient until the test interval of the slip ratio is traversed.
5. An adhesion coefficient utilization test system, comprising:
the communication module is used for establishing a command transmission and information interaction communication path with the vehicle control system;
the wheel shaft switching module is used for selecting single wheel shafts from wheel shafts of the detected vehicle one by one to serve as single-shaft brake wheel shafts and correspondingly generating a plurality of target slip rates;
the single-axle brake control module is used for sending a single-axle brake control command to the vehicle control system so as to perform single-axle braking according to a set wheel axle;
the slip rate control module is used for issuing target slip rates to the vehicle control system one by one so as to enable the single-shaft brake vehicle wheel shaft to brake successively according to the set slip rates;
the braking time analysis module is used for receiving the braking time recorded and fed back by the vehicle control system and acquiring the optimal braking time of each wheel axle based on the braking time;
and the adhesion coefficient utilization rate calculation module is used for receiving the optimal braking time fed back by the braking time analysis module and obtaining the adhesion coefficient utilization rate according to a set calculation rule.
6. The system for testing adhesion coefficient utilization according to claim 5, further comprising a display control module for displaying the control interface, the process parameters and the test results during the test process.
7. An electronic device comprising a processor and a memory;
the memory having stored therein at least one instruction or a set of codes for at least one program;
the at least one instruction or at least one program code set loaded and executed by the processor to implement a method for adhesion coefficient utilization testing as claimed in any one of claims 1-4.
8. The electronic device of claim 7, further comprising a display and an input device, wherein the display is used for displaying the process parameters and the test results related to the test method, and the input device is a touch input device or a key input device.
9. A computer storage medium comprising instructions that, when run on an electronic device, cause the electronic device to perform a method of adhesion coefficient utilization testing as claimed in any one of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110799751.4A CN113624677B (en) | 2021-07-15 | 2021-07-15 | Attachment coefficient utilization rate testing method, system, equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110799751.4A CN113624677B (en) | 2021-07-15 | 2021-07-15 | Attachment coefficient utilization rate testing method, system, equipment and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113624677A true CN113624677A (en) | 2021-11-09 |
| CN113624677B CN113624677B (en) | 2023-07-21 |
Family
ID=78379805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110799751.4A Active CN113624677B (en) | 2021-07-15 | 2021-07-15 | Attachment coefficient utilization rate testing method, system, equipment and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113624677B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101414188A (en) * | 2008-12-03 | 2009-04-22 | 重庆邮电大学 | Automobile ABS ECU on-line calibration system and method based on CCP protocol |
| CN104880321A (en) * | 2015-05-18 | 2015-09-02 | 京西重工（上海）有限公司 | Environment simulator used for testing anti-lock brake system |
| CN107239069A (en) * | 2017-06-12 | 2017-10-10 | 奇瑞汽车股份有限公司 | A kind of intelligent vehicle line control brake system, brake apparatus and testboard |
| EP3339117A1 (en) * | 2016-12-21 | 2018-06-27 | Karlsruher Institut für Technologie | Method for controlling a vehicle braking system for optimizing the braking process |
| CN110836781A (en) * | 2019-11-26 | 2020-02-25 | 中汽研汽车检验中心(武汉)有限公司 | Trailer EBS braking response time simulation device and control method thereof |
| CN111959469A (en) * | 2020-08-21 | 2020-11-20 | 上海拿森汽车电子有限公司 | Wheel anti-lock control method and device and vehicle |
| CN112519737A (en) * | 2019-09-19 | 2021-03-19 | 广州汽车集团股份有限公司 | Control method and device for electric braking strength of vehicle, vehicle and storage medium |
-
2021
- 2021-07-15 CN CN202110799751.4A patent/CN113624677B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101414188A (en) * | 2008-12-03 | 2009-04-22 | 重庆邮电大学 | Automobile ABS ECU on-line calibration system and method based on CCP protocol |
| CN104880321A (en) * | 2015-05-18 | 2015-09-02 | 京西重工（上海）有限公司 | Environment simulator used for testing anti-lock brake system |
| EP3339117A1 (en) * | 2016-12-21 | 2018-06-27 | Karlsruher Institut für Technologie | Method for controlling a vehicle braking system for optimizing the braking process |
| CN107239069A (en) * | 2017-06-12 | 2017-10-10 | 奇瑞汽车股份有限公司 | A kind of intelligent vehicle line control brake system, brake apparatus and testboard |
| CN112519737A (en) * | 2019-09-19 | 2021-03-19 | 广州汽车集团股份有限公司 | Control method and device for electric braking strength of vehicle, vehicle and storage medium |
| CN110836781A (en) * | 2019-11-26 | 2020-02-25 | 中汽研汽车检验中心(武汉)有限公司 | Trailer EBS braking response time simulation device and control method thereof |
| CN111959469A (en) * | 2020-08-21 | 2020-11-20 | 上海拿森汽车电子有限公司 | Wheel anti-lock control method and device and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113624677B (en) | 2023-07-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108414244B (en) | Electric automobile power assembly real vehicle simulation test bed and test method thereof | |
| CN109060369B (en) | Distributed electric transmission system test method, device and rack | |
| US8689618B2 (en) | Method and device for dynamometer testing of a motor vehicle | |
| CN100425469C (en) | Vehicle braking system and vehicle braking method | |
| US10717421B2 (en) | Braking force distribution method and system of multiple train units | |
| CN104340324B (en) | Bicycle control | |
| JPH1035443A (en) | Apparatus for presuming car body speed and coefficient of friction on road surface | |
| CN107856574A (en) | The driving-force control apparatus of vehicle | |
| CN103869809A (en) | Railway locomotive running dynamic simulation test device and simulation method thereof | |
| CN109435705A (en) | Electric automobile and damping control method, device, equipment and medium thereof | |
| CN104777825B (en) | The inspection stand of wheel hub motor system method for controlling torque and method for controlling torque | |
| CN107444132A (en) | Method and device for evaluating braking energy recovery rate | |
| KR20210073358A (en) | System of modeling abs controller of vehicle | |
| Dépature et al. | Characterisation of the electric drive of ev: on‐road versus off‐road method | |
| US11274994B2 (en) | Method for determining a parameter of a wheel of an observed railway vehicle and evaluation unit | |
| CN108956156B (en) | Performance test method and device for brake locking system of vehicle | |
| CN113624677B (en) | Attachment coefficient utilization rate testing method, system, equipment and storage medium | |
| CN112874508B (en) | Hybrid power assembly brake control method, device, equipment and storage medium | |
| CN207141055U (en) | A kind of test system of vehicle air anti-lock performance | |
| CN109656235B (en) | Vehicle control unit in-loop simulation test system and control method thereof | |
| CN107600074A (en) | Vehicle speed measurement method and device | |
| CN116754416A (en) | Method and device for testing abrasion performance of indoor tire, storage medium and electronic equipment | |
| CN111665060A (en) | Test object testing device, test object testing method, and storage medium | |
| US11754434B1 (en) | Real-time reporting and estimating of mass of vehicles using drive characteristics | |
| CN102096761A (en) | Apparatus and method for supplying a person with information for statically adjusting a motor vehicle equipped with wheels fitted with tyres |
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 |