CN114739350B - Method and system for calibrating road surface dynamic tire pressure detector based on modal excitation - Google Patents
Method and system for calibrating road surface dynamic tire pressure detector based on modal excitation Download PDFInfo
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- CN114739350B CN114739350B CN202210381787.5A CN202210381787A CN114739350B CN 114739350 B CN114739350 B CN 114739350B CN 202210381787 A CN202210381787 A CN 202210381787A CN 114739350 B CN114739350 B CN 114739350B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/30—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring roughness or irregularity of surfaces
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/01—Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
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- 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
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Abstract
The application relates to the technical field of road detection, in particular to a method for calibrating a road dynamic tire pressure detector based on modal excitation, which comprises the following steps: acquiring a force hammer indication value; the force hammer indication value is used for representing the excitation of the modal excitation force hammer on the vehicle tyre; obtaining the bumping degree; the jolting degree is used for representing the road surface quality detection condition; and calibrating the dynamic tire pressure detector of the road surface according to the force hammer indication value and the jolt degree. The application also provides a system for calibrating the road surface dynamic tire pressure detector based on modal excitation, which comprises: the modal excitation calibration subsystem is used for acquiring the force hammer indication value and transmitting the force hammer indication value to the dynamic tire pressure detection subsystem; the dynamic tire pressure detection subsystem is used for acquiring the bump degree; and calibrating the dynamic tire pressure detector of the road surface according to the force hammer indication value and the jolt degree. The dynamic tire pressure detector on the road is calibrated according to the indicating value of the force hammer and the bumping degree, so that the measuring accuracy of the dynamic tire pressure detector on the road is improved, and the accuracy and objectivity of the quality detection on the road are further improved.
Description
Technical Field
The application relates to the technical field of road detection, in particular to a method and a system for calibrating a road dynamic tire pressure detector based on modal excitation.
Background
With the explosive growth of the road network of the roads and towns in China in recent years, the health condition of the road infrastructure becomes important information which is urgently needed to be mastered by the management and maintenance units, the road surface is taken as the road infrastructure and is an important structure for providing vehicle running, and the road surface quality directly influences the safety of the vehicle running and the comfort of passengers.
At present, the road surface quality detection method generally comprises the steps of collecting a tire dynamic pressure change value of a running vehicle through a road surface dynamic tire pressure detector, and then obtaining a road surface bumping index according to the tire dynamic pressure change value. The utility model provides a road surface developments tyre pressure detector belongs to precision instrument measuring equipment, need often to calibrate it, and only the more accurate measurement of road surface developments tyre pressure detector just can gather more accurate tire dynamic pressure variation value to improve road surface quality detection's accuracy and objectivity. Therefore, there is a need for a calibration method of a road surface dynamic tire pressure detector to improve the accuracy of the measurement of the road surface dynamic tire pressure detector.
Disclosure of Invention
Aiming at the defects existing in the prior art, the application provides a method and a system for calibrating a road surface dynamic tire pressure detector based on modal excitation, so as to improve the measurement accuracy of the road surface dynamic tire pressure detector.
In a first aspect, the technical scheme adopted by the application is a calibration method of a road surface dynamic tire pressure detector based on modal excitation.
In a first implementation, a force hammer indication value is obtained; the force hammer indication value is used for representing the excitation of the modal excitation force hammer on the vehicle tyre; obtaining the bumping degree; the jolting degree is used for representing the road surface quality detection condition; and calibrating the dynamic tire pressure detector of the road surface according to the force hammer indication value and the jolt degree.
In combination with the first implementation, in a second implementation, obtaining the force hammer indication value includes: acquiring an excitation signal value of a modal excitation force hammer; acquiring the sensitivity of a modal excitation force hammer; and acquiring a force hammer indication value according to the excitation signal value and the sensitivity.
With reference to the first implementation manner, in a third implementation manner, obtaining the jolting degree includes: acquiring a dynamic tire pressure signal of a vehicle tire; acquiring longitudinal detection mileage of a vehicle tire; and obtaining the bumping degree according to the dynamic tire pressure signal and the longitudinal detection mileage.
With reference to the first implementation manner, in a fourth implementation manner, calibrating the road surface dynamic tire pressure detector according to the force hammer indication value and the jolt degree includes: acquiring a jolting degree accuracy coefficient according to the jolting degree and the force hammer indication value; obtaining a representative value of the jolting degree measurement accuracy coefficient according to the jolting degree accuracy coefficient; and under the condition that the representative value of the bump measurement accuracy coefficient is smaller than a preset threshold value, resetting parameters of the road surface dynamic tire pressure detector until the representative value of the bump measurement accuracy coefficient is larger than or equal to the preset threshold value.
According to the technical scheme of the fourth realizable mode, the beneficial technical effects of the application are as follows: and under the condition that the representative value of the bump measurement accuracy coefficient is smaller than a preset threshold value, resetting parameters of the road surface dynamic tire pressure detector until the representative value of the bump measurement accuracy coefficient is larger than or equal to the preset threshold value. Therefore, the data measured by the road surface dynamic tire pressure detector can meet the measurement requirement, and the stability of the measurement of the road surface dynamic tire pressure detector is improved.
In a second aspect, the technical scheme adopted by the application is a road surface dynamic tire pressure detector calibration system based on modal excitation.
In a fifth possible implementation manner, the pavement dynamic tire pressure detector calibration system based on modal excitation includes: the modal excitation calibration subsystem is used for acquiring the force hammer indication value and transmitting the force hammer indication value to the dynamic tire pressure detection subsystem; the force hammer indication value is used for representing the excitation of the modal excitation force hammer on the vehicle tyre; the dynamic tire pressure detection subsystem is used for acquiring the bump degree; calibrating the dynamic tire pressure detector of the road according to the force hammer indication value and the jolt degree; the bumpiness is used for representing the road surface quality detection condition.
With reference to the fifth implementation, in a sixth implementation, the modal excitation calibration subsystem includes: the device comprises a first power supply, a modal excitation hammer, a data acquisition module and a data operation module; the first power supply is connected with the first end of the data acquisition module and is used for supplying power; the modal excitation force hammer is connected with the second end of the data acquisition module and is used for exciting the forward tread of the vehicle tire; the third end of the data acquisition module is connected with the data operation module, and the data acquisition module is used for acquiring an excitation signal value of the modal excitation force hammer; and the data operation module is used for acquiring the force hammer indication value according to the excitation signal value and transmitting the force hammer indication value to the dynamic tire pressure detection subsystem.
In combination with the sixth implementation manner, in a seventh implementation manner, the modal excitation force hammer is a sensor for measuring excitation response of the tire structure, and the signal output by the modal excitation force hammer is an ICP (Integrated Circuits Piezoelectric, piezoelectric integrated circuit) dynamic signal.
With reference to the fifth implementation manner, in an eighth implementation manner, the dynamic tire pressure detecting subsystem includes: the system comprises a second power supply, a dynamic pressure sensor, an encoder, a road surface dynamic tire pressure detector and a visual terminal; the second power supply is connected with the first end of the road surface dynamic tire pressure detector and is used for supplying power; the dynamic pressure sensor is connected with the second end of the road surface dynamic tire pressure detector and is used for measuring dynamic tire pressure signals of vehicle tires; the encoder is connected with the third end of the road surface dynamic tire pressure detector and is used for measuring the longitudinal detection mileage of the vehicle tire; the fourth end of the road surface dynamic tire pressure detector is connected with the visual terminal, and the road surface dynamic tire pressure detector is used for acquiring the bump degree according to the dynamic tire pressure signal and the longitudinal detection mileage; and the visual terminal is used for receiving the force hammer indication value and calibrating the road dynamic tire pressure detector according to the force hammer indication value and the jolt degree.
As can be seen from the technical scheme of the eighth implementation manner, the beneficial technical effects of the application are as follows: the calibration test environment conditions of the road surface dynamic tire pressure detector are built by using the modal excitation hammer and the data acquisition module, the accuracy of the road surface dynamic tire pressure detector, the dynamic pressure sensor and the encoder are verified by the representative value of the jolt degree measurement accuracy coefficient, the scientific and complete calibration evaluation of the system is provided, and the reliability and objectivity of the road surface service quality evaluation are improved.
In combination with the eighth implementation, in a ninth implementation, the encoder is mounted on the vehicle hub by a weight pan member.
With reference to the eighth implementation manner, in a tenth implementation manner, the road surface dynamic tire pressure detector is further configured to obtain a jolting degree index according to the jolting degree; the trigger visualization terminal displays the jerk and jerk index.
According to the technical scheme, the beneficial technical effects of the application are as follows: the dynamic tire pressure detector on the road is calibrated according to the indicating value of the force hammer and the bumping degree, so that the measuring accuracy of the dynamic tire pressure detector on the road is improved, and the accuracy and objectivity of the quality detection on the road are further improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
Fig. 1 is a schematic diagram of a calibration method of a dynamic tire pressure detector for a road surface based on modal excitation according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a calibration system of a dynamic tire pressure detector for a road surface based on modal excitation according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a method for obtaining a force hammer indication value according to an embodiment of the present application;
FIG. 4-A is a schematic diagram of a first modal excitation hammer calibration test provided by an embodiment of the present application;
FIG. 4-B is a schematic diagram of a second modal excitation hammer calibration test provided by an embodiment of the present application;
FIG. 4-C is a schematic diagram of a third modal excitation hammer calibration test provided by an embodiment of the present application;
FIG. 4-D is a schematic diagram of a fourth modal excitation hammer calibration test provided by an embodiment of the present application;
fig. 5 is a schematic diagram of a method for obtaining a representative value of a pitch index measurement accuracy coefficient according to an embodiment of the present application.
Reference numerals:
the system comprises a 1-mode excitation calibration subsystem, a 2-dynamic tire pressure detection subsystem, a 3-first power supply, a 4-mode excitation force hammer, a 5-data acquisition module, a 6-notebook computer, a 7-second power supply, an 8-dynamic pressure sensor, a 9-encoder, a 10-road surface dynamic tire pressure detector, an 11-visual terminal and a 12-vehicle tire.
Detailed Description
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.
Referring to fig. 1, the present embodiment provides a method for calibrating a road dynamic tire pressure detector based on modal excitation, including:
s101, acquiring a force hammer indication value; the force hammer indication value is used for representing the excitation of the modal excitation force hammer on the vehicle tyre;
step S102, obtaining the bumping degree; the jolting degree is used for representing the road surface quality detection condition;
and step S103, calibrating the road surface dynamic tire pressure detector according to the force hammer indication value and the jolt degree.
Optionally, obtaining the force hammer indication value includes: acquiring an excitation signal value of a modal excitation force hammer; acquiring the sensitivity of a modal excitation force hammer; and acquiring a force hammer indication value according to the excitation signal value and the sensitivity.
Optionally, the force hammer indication value F is obtained by calculating the excitation signal value and the sensitivity by the following formula:
in the above formula (1), D is an excitation signal value of the modal excitation hammer, and s is the sensitivity of the modal excitation hammer.
Optionally, obtaining the pitch comprises: acquiring a dynamic tire pressure signal of a vehicle tire; acquiring longitudinal detection mileage of a vehicle tire; and obtaining the bumping degree according to the dynamic tire pressure signal and the longitudinal detection mileage.
Optionally, obtaining the jolting degree according to the dynamic tire pressure signal and the longitudinal detection mileage comprises the following steps: obtaining running average integration time according to the longitudinal detection mileage; and obtaining the bumping degree according to the dynamic tire pressure signal and the running average integration time.
Optionally, obtaining the running average integration time according to the longitudinal detection mileage includes: the running average integration time is obtained by dividing the running time of the vehicle tire by the longitudinal detection mileage of the vehicle tire. Alternatively, the running average integration time is a vehicle running time of 1 meter per unit length.
Optionally, calculating the dynamic tire pressure signal and the running average integration time through the following formula to obtain the jolt degree;
in the above formula (2), s' is an effective contact area between the tire and the road surface; τ is the running average integration time; t is t 0 Is the instantaneous time; x is a dynamic tire pressure signal; f (f) w And (5) weighting and filtering the tire pressure.
Optionally, the tire pressure weighting filter function is obtained by: filtering the main frequency band of the dynamic tire pressure signal to remove frequency components above 100 Hz; the frequency components of dynamic tire pressure transformation caused by the pavement characteristics are effectively increased, and other frequency components are attenuated; and (3) revising the frequency transfer function by comparing the vibration acceleration and the difference of the dynamic tire pressure frequency component at the same moment under the same condition, and determining the revised function as the tire pressure weight counting filter function.
Optionally, the calibration method of the road surface dynamic tire pressure detector based on modal excitation further comprises the following steps: obtaining a jolting degree index according to the jolting degree; the jounce index is used for representing the health state of the road surface. Thus, the road health status can be intuitively known.
Alternatively, the pitch is calculated by the following formula to obtain a pitch index PFI;
PFI＝b·exp(-a 0 *FI-a 1 )) (3)；
in the above formula (3), FI is the bump degree, b is the first model parameter, a 0 For the second model parameter, a 1 For the third model parameters, b, a 0 、a 1 And the road surface evaluation is carried out by obtaining the model function fitting and converting the bumping degree into a percentage result.
Optionally, calibrating the road surface dynamic tire pressure detector according to the force hammer indication value and the jounce degree comprises the following steps: acquiring a jolting degree accuracy coefficient according to the jolting degree and the force hammer indication value; obtaining a representative value of the jolting degree measurement accuracy coefficient according to the jolting degree accuracy coefficient; and under the condition that the representative value of the bump measurement accuracy coefficient is smaller than a preset threshold value, resetting parameters of the road surface dynamic tire pressure detector until the representative value of the bump measurement accuracy coefficient is larger than or equal to the preset threshold value.
Alternatively, the pitch accuracy coefficient r is obtained by the following formula j (FI i ,F i )；
In the above formula (4), r j (FI i ,F i ) Is the firstj times of measured jolting degree accuracy coefficient, j is an integer, j is more than or equal to 5, FI i For the ith measured jerk, F i For the force hammer indication value measured at the ith time, i is an integer, i is not less than 5, cov (FI i ,F i ) For FI i And F i Covariance of Var [ FI ] i ]For FI i Variance of Var [ F ] i ]Is F i Is a variance of (c).
Alternatively, the pitch measurement accuracy coefficient representative value r is obtained by the following formula (FI,F) ；
r (FI,F) ＝MIN[r j (FI i ,F i )] (5)；
In the above formula (5), r j (FI i ,F i ) Is the bump accuracy coefficient.
Optionally, resetting parameters of the road surface dynamic tire pressure detector includes: the sensitivity of the road surface dynamic tire pressure detector is reset.
Optionally, the preset threshold is 0.9. In some embodiments, the accuracy coefficient represents the value r in the jerk measurement (FI,F) And under the condition that the measurement accuracy of the road surface dynamic tire pressure detector is more than or equal to 0.9, the measurement requirement is met, and recalibration is not needed. In the representative value r of the coefficient of accuracy of the bump measurement (FI,F) <Under the condition of 0.9, the measurement accuracy of the road surface dynamic tire pressure detector does not meet the measurement requirement, the sensitivity of the road surface dynamic tire pressure detector is reset, and the road surface dynamic tire pressure detector is recalibrated until the measurement accuracy of the road surface dynamic tire pressure detector meets the measurement requirement.
Referring to fig. 2, the present embodiment provides a calibration system for a dynamic tire pressure detector for a road surface based on modal excitation, including: a modal excitation calibration subsystem 1 and a dynamic tire pressure detection subsystem 2. The modal excitation calibration subsystem is used for acquiring the force hammer indication value and transmitting the force hammer indication value to the dynamic tire pressure detection subsystem 2; the force hammer indication value is used for representing the excitation of the modal excitation force hammer on the vehicle tyre; the dynamic tire pressure detection subsystem is used for acquiring the bump degree; calibrating the dynamic tire pressure detector of the road according to the force hammer indication value and the jolt degree; the bumpiness is used for representing the road surface quality detection condition.
As shown in connection with fig. 2, the modal excitation calibration subsystem 1 optionally includes: the device comprises a first power supply 3, a modal excitation hammer 4, a data acquisition module 5 and a data operation module; the first power supply 3 is connected with the first end of the data acquisition module 5 and is used for supplying power; the modal excitation force hammer 4 is connected with the second end of the data acquisition module 5 and is used for exciting the forward tread of the vehicle tire; the third end of the data acquisition module 5 is connected with the data operation module, and the data acquisition module is used for acquiring an excitation signal value of the modal excitation force hammer; the data operation module is used for obtaining the force hammer indication value according to the excitation signal value and sending the force hammer indication value to the dynamic tire pressure detection subsystem. Optionally, the data operation module is a notebook computer 6.
Optionally, the first power supply provides a 12V/2A regulated dc power supply to the data acquisition module.
Optionally, the modal excitation force hammer is an excitation response sensing device for measuring the tire structure, and the signal output by the modal excitation force hammer is an ICP dynamic signal.
In some embodiments, the data acquisition module is configured to acquire data of acoustic and vibration signals to provide a 4mA constant current source drive for the modal excitation hammer. When the modal excitation hammer excites the forward tread of the vehicle tyre, the data acquisition module acquires signals of the modal excitation hammer, and the data sampling rate is more than or equal to 20KHz. The data acquisition module carries out analog-to-digital conversion on the acquired signals, and transmits excitation signal values obtained after conversion to the data operation module through USB (Universal Serial Bus ) for data storage. The data operation module calculates in real time by using the formula (1) to obtain the force hammer indication value F.
Optionally, the data operation module comprises more than 1 path of USB 3.0 interfaces, and the data operation module is used for data input, data storage and screen display. The data operation module is connected with the data acquisition module and used for controlling the data acquisition module to acquire data and analyze and process the excitation signal value. In some embodiments, the data operation module is a high-performance portable computer, the CPU (Central Processing Unit ) has a processing performance higher than that of the Inter Core i5, the memory is greater than 8GB, and the hard disk capacity is greater than 512GB.
In some embodiments, as shown in connection with fig. 3, the method of obtaining the force hammer indication value is as follows:
step S201, a data acquisition module is started to acquire signals of the mode excitation hammer, the sampling rate is 20KHz, and the sampling time is 5S;
step S202, exciting a forward tread of a vehicle tire by a modal exciting force hammer, and obtaining an exciting signal value by a data acquisition module;
step S203, look-up table is carried out on the performance parameter table of the modal excitation hammer to obtain the sensitivity value of the modal excitation hammer;
and S204, acquiring a force hammer indication value F according to the excitation signal value and the sensitivity value of the modal excitation force hammer.
As shown in connection with fig. 2, the dynamic tire pressure detection subsystem 2 optionally includes: the system comprises a second power supply 7, a dynamic pressure sensor 8, an encoder 9, a road surface dynamic tire pressure detector 10 and a visual terminal 11; the second power supply 7 is connected with the first end of the road surface dynamic tire pressure detector 10 and is used for supplying power; the dynamic pressure sensor 8 is connected with the second end of the road surface dynamic tire pressure detector 10, and is used for measuring dynamic tire pressure signals of the vehicle tires 12; the encoder 9 is connected with a third end of the road surface dynamic tire pressure detector 10 and is used for measuring the longitudinal detection mileage of the vehicle tire; the fourth end of the road surface dynamic tire pressure detector 10 is connected with the visual terminal 11, and the road surface dynamic tire pressure detector is used for acquiring the bumping degree of the road surface dynamic tire pressure detector according to the dynamic tire pressure signal and the longitudinal detection mileage; the visual terminal is used for receiving the force hammer indication value and calibrating the road dynamic tire pressure detector according to the force hammer indication value and the jolt degree.
Optionally, the dynamic pressure sensor is an ICP piezoelectric dynamic pressure measurement sensor, and is used for measuring a dynamic change value of the tire pressure of the vehicle caused by the structural change of the road surface, so as to obtain a dynamic tire pressure signal.
Optionally, the encoder is mounted on the vehicle hub by a weight pan structure. The encoder includes a road lane mileage measurement system.
Optionally, the road surface dynamic tire pressure detector is further used for acquiring a jolting degree index according to the jolting degree; the trigger visualization terminal displays the jerk and jerk index.
Optionally, the second power source is a vehicle-mounted power source, including an automobile-mounted direct current power supply system with dual battery management, and the vehicle-mounted power source obtains an initial power source by installing a solar photovoltaic panel on the top of the automobile.
Optionally, the second power supply provides a stable direct current power supply of 12V/3A for the road surface dynamic tire pressure detector.
Optionally, the visual terminal is a portable mobile terminal and is connected with the road surface dynamic tire pressure detector through a WIFI6 network. In some embodiments, the visual terminal controls the road surface dynamic tire pressure detector to detect, and after the road surface dynamic tire pressure detector detects the jolt degree and the jolt degree index, the jolt degree and the jolt degree index are sent to the visual terminal, and the visual terminal displays the jolt degree and the jolt degree index on the display screen.
In some embodiments, FIGS. 4-A, 4-B, 4-C, and 4-D are schematic illustrations of a modal excitation hammer calibration test, the modal excitation hammer 4 applying a force hammer indication F excitation to the forward tread of the vehicle tire 12. In fig. 4-a, the angle between the modal exciting force hammer 4 and the dynamic tire pressure sensor 8 is 0 degrees. In fig. 4-B, the angle between the modal excitation hammer 4 and the dynamic tire pressure sensor 8 is 90 degrees.
In fig. 4-C, the angle between the modal excitation hammer 4 and the dynamic tire pressure sensor 8 is 180 degrees. In fig. 4-D, the angle between the modal excitation hammer 4 and the dynamic tire pressure sensor 8 is 270 degrees.
In some embodiments, the modal excitation hammer calibration test procedure is as follows: knocking the middle position of the tread on the left side of the tire by using a modal excitation force hammer, continuously knocking for 10 times at intervals of about 3 seconds, repeating the test for 3 times, and respectively reading the bumping degree FI of the road surface dynamic tire pressure detector i And the force hammer indication value F of the notebook computer i And recording; according to the degree of jolt FI i Sum of force hammer indication value F i Calculating the accuracy coefficient r of the bump measurement j 。
Referring to fig. 5, in some embodiments, the method for obtaining the representative value of the pitch index measurement accuracy coefficient is as follows:
step S301, maintaining the relative level of the test ground during the road surface bump measurement accuracy test;
step S302, starting a data acquisition module and a road surface dynamic tire pressure detector;
step S303, under the condition that the included angle between the modal excitation force hammer and the dynamic tire pressure sensor is 0 degree (shown in fig. 4-A); acquiring a first jounce degree and a first force hammer indication value, and acquiring a first jounce degree measurement accuracy coefficient according to the first jounce degree and the first force hammer indication value;
step S304, under the condition that the included angle between the modal excitation force hammer and the dynamic tire pressure sensor is 90 degrees (shown in fig. 4-B); acquiring a second bump degree and a second force hammer indication value, and acquiring a second bump degree measurement accuracy coefficient according to the second bump degree and the second force hammer indication value;
step S305, under the condition that the included angle between the modal excitation force hammer and the dynamic tire pressure sensor is 180 degrees (shown in fig. 4-C); acquiring a third bump degree and a third force hammer indication value, and acquiring a third bump degree measurement accuracy coefficient according to the third bump degree and the third force hammer indication value;
step S306, under the condition that the included angle between the modal excitation force hammer and the dynamic tire pressure sensor is 270 degrees (shown in fig. 4-D); acquiring a fourth bump degree and a fourth force hammer indication value, and acquiring a fourth bump degree measurement accuracy coefficient according to the fourth bump degree and the fourth force hammer indication value;
step S307, obtaining a representative value of the pitch measurement accuracy coefficient according to the first pitch measurement accuracy coefficient, the second pitch measurement accuracy coefficient, the third pitch measurement accuracy coefficient and the fourth pitch measurement accuracy coefficient;
step S308, judging whether the representative value of the bump degree measurement accuracy coefficient is larger than or equal to 0.9; executing step S309 when the representative value of the bump degree measurement accuracy coefficient is greater than or equal to 0.9; in the case where the pitch measurement accuracy coefficient representative value is <0.9, step S310 is performed;
step S309, determining that the measurement accuracy of the road surface dynamic tire pressure detector meets the measurement requirement;
and step S310, resetting parameters of the road surface dynamic tire pressure detector, and recalibrating the road surface dynamic tire pressure detector until the representative value of the bump measurement accuracy coefficient is greater than or equal to 0.9.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description.
Claims (7)
1. The utility model provides a road surface developments tyre pressure detector calibration method based on modal excitation which characterized in that includes:
acquiring a force hammer indication value; the force hammer indication value is used for representing the excitation of the modal excitation force hammer on the vehicle tyre;
obtaining the bumping degree; the jolting degree is used for representing road surface quality detection conditions;
calibrating a road surface dynamic tire pressure detector according to the force hammer indication value and the jolt degree;
the acquiring the force hammer indication value comprises the following steps: acquiring an excitation signal value of the modal excitation force hammer; acquiring the sensitivity of the modal excitation force hammer; acquiring the force hammer indication value according to the excitation signal value and the sensitivity;
the obtaining the bumpiness includes: acquiring a dynamic tire pressure signal of the vehicle tire; acquiring longitudinal detection mileage of the vehicle tire; acquiring the bumping degree according to the dynamic tire pressure signal and the longitudinal detection mileage; obtaining the bump degree according to the dynamic tire pressure signal and the longitudinal detection mileage comprises the following steps: obtaining running average integration time according to the longitudinal detection mileage; obtaining the bumping degree according to the dynamic tire pressure signal and the running average integration time;
calculating the dynamic tire pressure signal and the running average integration time through the following formula to obtain the bumpiness;
in the above formula, s' is the effective contact area between the tire and the road surface; τ is the running average integration time; t is t 0 Is the instantaneous time; x is a dynamic tire pressure signal; f (f) w A tire pressure weighting filter function;
calibrating the road surface dynamic tire pressure detector according to the force hammer indication value and the jolting degree, comprising the following steps: acquiring a jolting degree accuracy coefficient according to the jolting degree and the force hammer indication value; obtaining a representative value of the jolting degree measurement accuracy coefficient according to the jolting degree accuracy coefficient; resetting parameters of the road surface dynamic tire pressure detector under the condition that the representative value of the bump measurement accuracy coefficient is smaller than a preset threshold value until the representative value of the bump measurement accuracy coefficient is larger than or equal to the preset threshold value;
the pitch accuracy coefficient r is obtained by the following formula j (FI i ,F i )；
In the above formula, r j (FI i ,F i ) For the jolting degree accuracy coefficient measured for the j th time, j is an integer, j is more than or equal to 5, FI i For the ith measured jerk, F i For the force hammer indication value measured at the ith time, i is an integer, i is not less than 5, cov (FI i ,F i ) For FI i And F i Covariance of Var [ FI ] i ]For FI i Variance of Var [ F ] i ]Is F i Is a variance of (c).
2. A pavement dynamic tire pressure detector calibration system based on modal excitation, comprising: a modal excitation calibration subsystem and a dynamic tire pressure detection subsystem;
the modal excitation calibration subsystem is used for acquiring a force hammer indication value and transmitting the force hammer indication value to the dynamic tire pressure detection subsystem; the force hammer indication value is used for representing the excitation of the modal excitation force hammer on the vehicle tyre;
the dynamic tire pressure detection subsystem is used for acquiring the bump degree; calibrating a road surface dynamic tire pressure detector according to the force hammer indication value and the jolt degree; the jolting degree is used for representing road surface quality detection conditions;
the acquiring the force hammer indication value comprises the following steps: acquiring an excitation signal value of the modal excitation force hammer; acquiring the sensitivity of the modal excitation force hammer; acquiring the force hammer indication value according to the excitation signal value and the sensitivity;
the obtaining the bumpiness includes: acquiring a dynamic tire pressure signal of the vehicle tire; acquiring longitudinal detection mileage of the vehicle tire; acquiring the bumping degree according to the dynamic tire pressure signal and the longitudinal detection mileage; obtaining the bump degree according to the dynamic tire pressure signal and the longitudinal detection mileage comprises the following steps: obtaining running average integration time according to the longitudinal detection mileage; obtaining the bumping degree according to the dynamic tire pressure signal and the running average integration time;
calculating the dynamic tire pressure signal and the running average integration time through the following formula to obtain the bumpiness;
in the above formula, s' is the effective contact area between the tire and the road surface; τ is the running average integration time; t is t 0 Is the instantaneous time; x is a dynamic tire pressure signal; f (f) w A tire pressure weighting filter function;
calibrating the road surface dynamic tire pressure detector according to the force hammer indication value and the jolting degree, comprising the following steps: acquiring a jolting degree accuracy coefficient according to the jolting degree and the force hammer indication value; obtaining a representative value of the jolting degree measurement accuracy coefficient according to the jolting degree accuracy coefficient; resetting parameters of the road surface dynamic tire pressure detector under the condition that the representative value of the bump measurement accuracy coefficient is smaller than a preset threshold value until the representative value of the bump measurement accuracy coefficient is larger than or equal to the preset threshold value;
the pitch accuracy coefficient r is obtained by the following formula j (FI i ,F i )；
In the above formula, r j (FI i ,F i ) For the jolting degree accuracy coefficient measured for the j th time, j is an integer, j is more than or equal to 5, FI i For the ith measured jerk, F i For the force hammer indication value measured at the ith time, i is an integer, i is not less than 5, cov (FI i ,F i ) For FI i And F i Covariance of Var [ FI ] i ]For FI i Variance of Var [ F ] i ]Is F i Is a variance of (c).
3. The system of claim 2, wherein the modal excitation calibration subsystem comprises: the device comprises a first power supply, a modal excitation hammer, a data acquisition module and a data operation module;
the first power supply is connected with the first end of the data acquisition module and is used for supplying power;
the modal excitation force hammer is connected with the second end of the data acquisition module and is used for exciting the forward tread of the vehicle tire;
the third end of the data acquisition module is connected with the data operation module, and the data acquisition module is used for acquiring the excitation signal value of the modal excitation force hammer;
the data operation module is used for acquiring the force hammer indication value according to the excitation signal value and sending the force hammer indication value to the dynamic tire pressure detection subsystem.
4. A system according to claim 3, wherein the modal excitation hammer is a measuring tire structure excitation response sensing device and the signal output by the modal excitation hammer is an ICP dynamic signal.
5. The system of claim 2, wherein the dynamic tire pressure detection subsystem comprises: the system comprises a second power supply, a dynamic pressure sensor, an encoder, a road surface dynamic tire pressure detector and a visual terminal;
the second power supply is connected with the first end of the road surface dynamic tire pressure detector and is used for supplying power;
the dynamic pressure sensor is connected with the second end of the road surface dynamic tire pressure detector and is used for measuring dynamic tire pressure signals of the vehicle tires;
the encoder is connected with the third end of the road surface dynamic tire pressure detector and is used for measuring the longitudinal detection mileage of the vehicle tire;
the fourth end of the road surface dynamic tire pressure detector is connected with the visual terminal, and the road surface dynamic tire pressure detector is used for acquiring the bumping degree according to the dynamic tire pressure signal and the longitudinal detection mileage;
and the visual terminal is used for receiving the force hammer indication value and calibrating the road surface dynamic tire pressure detector according to the force hammer indication value and the jolt degree.
6. The system of claim 5, wherein the encoder is mounted on the vehicle hub by a weight pan member.
7. The system of claim 5, wherein the road dynamic tire pressure detector is further configured to obtain a jounce index from the jounce; and triggering the visual terminal to display the jolt degree and the jolt degree index.
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