CN114739350A - Pavement dynamic tire pressure detector calibration method and system based on modal excitation - Google Patents
Pavement dynamic tire pressure detector calibration method and system based on modal excitation Download PDFInfo
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- CN114739350A CN114739350A CN202210381787.5A CN202210381787A CN114739350A CN 114739350 A CN114739350 A CN 114739350A CN 202210381787 A CN202210381787 A CN 202210381787A CN 114739350 A CN114739350 A CN 114739350A
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- tire pressure
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- dynamic tire
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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
Abstract
The invention relates to the technical field of road detection, in particular to a calibration method of a road surface 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 to the vehicle tire; obtaining the degree of jolt; the degree of jolt is used for representing the road surface quality detection condition; and calibrating the road dynamic tire pressure detector according to the force hammer indication value and the bumping degree. The invention also provides a calibration system of the road surface dynamic tire pressure detector based on modal excitation, which comprises the following components: the modal excitation calibration subsystem is used for acquiring a force hammer indicating value and sending the force hammer indicating value to the dynamic tire pressure detection subsystem; the dynamic tire pressure detection subsystem is used for acquiring the degree of jounce; and calibrating the road dynamic tire pressure detector according to the force hammer indication value and the bumping degree. The road surface dynamic tire pressure detector is calibrated according to the force hammer indication value and the bumping degree, so that the measuring accuracy of the road surface dynamic tire pressure detector is improved, and the accuracy and the objectivity of the road surface quality detection are further improved.
Description
Technical Field
The invention 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 roads and road networks in cities and towns in recent years, the health status of road infrastructures is important information which is urgently needed to be mastered by management and maintenance units, and the road surfaces are important structures for providing vehicles to run as the road infrastructures, and the quality of the road surfaces directly influences the safety of the vehicles to run and the comfort of passengers.
At present, a road surface quality detection method generally acquires a tire dynamic pressure change value of a running vehicle through a road surface dynamic tire pressure detector, and then obtains a road surface jolt index according to the tire dynamic pressure change value. The road surface dynamic tire pressure detector belongs to a precise instrument measuring device, needs to be calibrated frequently, and can acquire a more accurate tire dynamic pressure change value only if the measurement of the road surface dynamic tire pressure detector is more accurate, so that the accuracy and the objectivity of the road surface quality detection are improved. Therefore, a calibration method for a road dynamic tire pressure detector is needed to improve the measurement accuracy of the road dynamic tire pressure detector.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a calibration method and a calibration system of a pavement dynamic tire pressure detector based on modal excitation, so as to improve the measurement accuracy of the pavement dynamic tire pressure detector.
In a first aspect, the invention adopts a technical scheme that a pavement dynamic tire pressure detector calibration method based on modal excitation is provided.
In a first implementable manner, a force hammer indication value is obtained; the force hammer indication value is used for representing the excitation of the modal excitation force hammer to the vehicle tire; obtaining the degree of jolt; the degree of jolt is used for representing the road surface quality detection condition; and calibrating the road dynamic tire pressure detector according to the force hammer indication value and the bumping degree.
With reference to the first implementable manner, in a second implementable manner, obtaining a force hammer indication value includes: acquiring an excitation signal value of the modal excitation force hammer; acquiring the sensitivity of the modal excitation force hammer; and acquiring a force hammer value according to the excitation signal value and the sensitivity.
In combination with the first implementable manner, in a third implementable manner, obtaining the jerk includes: acquiring a dynamic tire pressure signal of a vehicle tire; acquiring longitudinal detection mileage of a vehicle tire; and acquiring the degree of jounce according to the dynamic tire pressure signal and the longitudinal detection mileage.
In combination with the first implementable manner, in a fourth implementable manner, the road surface dynamic tire pressure detecting instrument is calibrated according to the force hamming value and the degree of jounce, including: obtaining a jolt accuracy coefficient according to the jolt and the force hammer indication value; obtaining a representative value of a jounce degree measurement accuracy coefficient according to the jounce degree accuracy coefficient; and resetting the parameters of the road surface dynamic tire pressure detector under the condition that the representative value of the jounce degree measurement accuracy coefficient is smaller than the preset threshold value until the representative value of the jounce degree measurement accuracy coefficient is larger than or equal to the preset threshold value.
According to the technical scheme of the fourth implementation mode, the beneficial technical effects of the invention are as follows: and resetting the parameters of the road surface dynamic tire pressure detector under the condition that the representative value of the jounce degree measurement accuracy coefficient is smaller than the preset threshold value until the representative value of the jounce degree 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 measurement stability of the road surface dynamic tire pressure detector is improved.
In a second aspect, the invention adopts the technical scheme that the calibration system for the road surface dynamic tire pressure detector is based on modal excitation.
In a fifth implementation manner, a calibration system for a road surface dynamic tire pressure detector based on modal excitation includes: the modal excitation calibration subsystem is used for acquiring a force hammer indicating value and sending the force hammer indicating 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 to the vehicle tire; the dynamic tire pressure detection subsystem is used for acquiring the bumping degree; calibrating the road dynamic tire pressure detector according to the force hammer indication value and the bumping degree; and the degree of jolt is used for representing the road surface quality detection condition.
With reference to the fifth implementable manner, in a sixth implementable manner, 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 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 positive 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 hammer; and 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.
With reference to the sixth implementation manner, in a seventh implementation manner, the modal excitation hammer is a sensor device for measuring excitation response of the tire structure, and the signal output by the modal excitation hammer is an ICP (Integrated Circuits Piezoelectric Integrated circuit) dynamic signal.
With reference to the fifth implementable manner, in an eighth implementable manner, the dynamic tire pressure detection 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 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 degree of jolt 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 bumping degree.
As can be seen from the above technical solutions in the eighth implementable modes, the beneficial technical effects of the present invention are as follows: the method has the advantages that the modal exciting force hammer and the data acquisition module are utilized to build a calibration test environment condition of the road surface dynamic tire pressure detector, accuracy verification is carried out on the road surface dynamic tire pressure detector, the dynamic pressure sensor and the encoder through the representative value of the bumpiness measurement accuracy coefficient, systematic, scientific and complete calibration assessment is provided, and reliability and objectivity of road surface service quality assessment are improved.
In combination with the eighth implementable mode, in a ninth implementable mode, the encoder is mounted on the vehicle hub through a weight pan structure.
In combination with the eighth implementable manner, in the tenth implementable manner, the road surface dynamic tire pressure detector is further configured to obtain a jounce degree index according to the jounce degree; and triggering the visual terminal to display the bumpiness degree and the bumpiness index.
According to the technical scheme, the beneficial technical effects of the invention are as follows: the road surface dynamic tire pressure detector is calibrated according to the force hammer indication value and the bumping degree, so that the measuring accuracy of the road surface dynamic tire pressure detector is improved, and the accuracy and the objectivity of the road surface quality detection are further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic diagram of a calibration method of a road surface dynamic tire pressure detector based on modal excitation according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a calibration system of a road surface dynamic tire pressure detector based on modal excitation according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a method for obtaining a force hammer indication according to an embodiment of the present invention;
FIG. 4-A is a schematic illustration of a first modal excitation force hammer calibration test provided in accordance with an embodiment of the present invention;
FIG. 4-B is a schematic illustration of a second modal excitation force hammer calibration test provided in accordance with an embodiment of the present invention;
FIG. 4-C is a schematic illustration of a third modal excitation hammer calibration test provided by an embodiment of the present invention;
FIG. 4-D is a schematic illustration of a fourth modal excitation force hammer calibration test provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of a method for obtaining a representative value of a measurement accuracy coefficient of a bump index according to an embodiment of the present invention.
Reference numerals:
the system comprises a 1-modal excitation calibration subsystem, a 2-dynamic tire pressure detection subsystem, a 3-first power supply, a 4-modal 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 present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
With reference to fig. 1, the present embodiment provides a calibration method for a road surface 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 to the vehicle tire;
step S102, obtaining the bumping degree; the degree of jolt is used for representing the road surface quality detection condition;
and S103, calibrating the road dynamic tire pressure detector according to the force hammer indication value and the bumping degree.
Optionally, obtaining the force hammer indication comprises: acquiring an excitation signal value of the modal excitation force hammer; obtaining the sensitivity of the modal excitation force hammer; and acquiring a force hammer value according to the excitation signal value and the sensitivity.
Optionally, the force hammer value F is obtained by calculating the excitation signal value and the sensitivity by the following formula:
in the above formula (1), D is the value of the excitation signal of the modal excitation hammer, and s is the sensitivity of the modal excitation hammer.
Optionally, obtaining the jerk comprises: acquiring a dynamic tire pressure signal of a vehicle tire; acquiring longitudinal detection mileage of a vehicle tire; and acquiring the degree of jounce according to the dynamic tire pressure signal and the longitudinal detection mileage.
Optionally, obtaining the jerk according to the dynamic tire pressure signal and the longitudinal detection mileage includes: obtaining running average integration time according to the longitudinal detection mileage; and obtaining the degree of bump 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: and dividing the running time of the vehicle tire by the longitudinal detection mileage of the vehicle tire to obtain the running average integration time. Alternatively, the running average integration time is a vehicle travel time per unit length of 1 meter.
Optionally, calculating the dynamic tire pressure signal and the running average integration time by the following formula to obtain the degree of jounce;
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 t0Is the instant time; x is a dynamic tire pressure signal; f. ofwIs a tire pressure weight filter function.
Optionally, the tire pressure weight filter function is obtained by: filtering the main frequency band of the dynamic tire pressure signal to remove frequency components above 100 Hz; performing effective gain on frequency components of dynamic tire pressure transformation caused by road surface characteristics, and attenuating other frequency components; and comparing the difference between the vibration acceleration and the dynamic tire pressure frequency component at the same time under the same condition, revising the frequency transfer function, and determining the revised function as a tire pressure weight filtering function.
Optionally, the method for calibrating the road surface dynamic tire pressure detector based on modal excitation further includes: obtaining a jolt degree index according to the jolt degree; the jerk index is used to characterize the state of health of the road surface. Therefore, the road health state can be conveniently and intuitively known.
Optionally, calculating the degree of jounce by the following formula to obtain a degree of jounce index PFI;
PFI＝b·exp(-a0*FI-a1)) (3)；
in the above formula (3), FI is the degree of pitch, b is the first model parameter, a0As a second model parameter, a1Is a third model parameter, b, a0、a1And obtaining the road surface evaluation result through model function fitting, and converting the bumping degree into a percent result for road surface evaluation.
Optionally, calibrating the road dynamic tire pressure detector according to the force hammer indication value and the jounce degree, including: obtaining a jolt accuracy coefficient according to the jolt and the force hammer indication value; acquiring a representative value of the jounce degree measurement accuracy coefficient according to the jounce degree accuracy coefficient; and resetting the parameters of the road surface dynamic tire pressure detector under the condition that the representative value of the jounce degree measurement accuracy coefficient is smaller than the preset threshold value until the representative value of the jounce degree measurement accuracy coefficient is larger than or equal to the preset threshold value.
Alternatively, the jerk accuracy coefficient r is obtained by the following formulaj(FIi,Fi)；
In the above formula (4), rj(FIi,Fi) The j is the accuracy coefficient of the j-th measurement, j is an integer, j is more than or equal to 5, FIiJounce for the i-th measurement, FiIs the force hammer value of the ith measurement, i is an integer, i is more than or equal to 5, Cov (FI)i,Fi) Is FIiAnd FiCovariance of (1), Var [ FI ]i]Is FIiVariance of (1), Var [ F ]i]Is FiThe variance of (c).
Alternatively, the representative value r of the jerk measurement accuracy coefficient is obtained by the following formula(FI,F)；
r(FI,F)＝MIN[rj(FIi,Fi)] (5)；
In the above formula (5), rj(FIi,Fi) Is the pitch accuracy factor.
Optionally, resetting the parameters of the road surface dynamic tire pressure detector comprises: and resetting the sensitivity of the road surface dynamic tire pressure detector.
Optionally, the preset threshold is 0.9. In some embodiments, the value r is representative of the accuracy coefficient of the jounce measurement(FI,F)And under the condition that the pressure is more than or equal to 0.9, the measurement accuracy of the road dynamic tire pressure detector meets the measurement requirement without recalibration. Measuring the representative value r of the accuracy coefficient in the degree of jounce(FI,F)<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, the road surface dynamic tire pressure detector is calibrated again,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 road surface dynamic tire pressure detector 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 a force hammer indicating value and sending the force hammer indicating 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 to the vehicle tire; the dynamic tire pressure detection subsystem is used for acquiring the degree of jounce; calibrating the road dynamic tire pressure detector according to the force hammer indication value and the bumping degree; and the degree of jolt is used for representing the road surface quality detection condition.
As shown in connection with fig. 2, optionally, the modal excitation calibration subsystem 1 includes: the device comprises a first power supply 3, a modal exciting force 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 positive 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 the excitation signal value of the modal excitation hammer; and the data operation module is used for acquiring a force hammer indicating value according to the excitation signal value and sending the force hammer indicating 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 stable dc power supply for the data acquisition module.
Optionally, the modal excitation force hammer is an excitation response sensor 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 the acoustic and vibration signals to provide a 4mA constant current source drive for the modal exciting force hammer. When the modal excitation force hammer excites the forward tread of the vehicle tire, the data acquisition module acquires signals of the modal excitation force hammer, and the data sampling rate is greater than or equal to 20 KHz. The data acquisition module performs analog-to-digital conversion on the acquired signals, and transmits excitation signal values obtained after conversion to the data operation module through a Universal Serial Bus (USB) for data storage. The data operation module utilizes the formula (1) to carry out real-time calculation to obtain a force hammer indication value F.
Optionally, the data operation module includes more than 1 channel of USB 3.0 interface, 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 is used for controlling the data acquisition module to acquire data and analyzing and processing the excitation signal value. In some embodiments, the data operation module is a high-performance portable computer, the Processing performance of a Central Processing Unit (CPU) is higher than that of an Inter Core i5, the memory is greater than 8GB, and the capacity of a hard disk is greater than 512 GB.
In some embodiments, as shown in connection with FIG. 3, the force hammer value may be obtained as follows:
step S201, starting a data acquisition module to acquire a signal of the modal exciting force hammer, wherein the sampling rate is 20KHz, and the sampling time is 5S;
step S202, exciting the forward tread of the vehicle tire by the modal exciting hammer, and acquiring an exciting signal value by the data acquisition module;
step S203, looking up a table of performance parameters of the modal exciting force hammer to obtain a sensitivity value of the modal exciting force hammer;
and step 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, optionally, the dynamic tire pressure detecting subsystem 2 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 a second end of the road surface dynamic tire pressure detector 10, and is used for measuring a dynamic tire pressure signal of a vehicle tire 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 a visual terminal 11, and the road surface dynamic tire pressure detector is used for acquiring the degree of jounce 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 bumping degree.
Optionally, the dynamic pressure sensor is an ICP piezoelectric dynamic pressure measuring sensor, and is configured to measure a dynamic change value of a tire pressure of a tire of the vehicle caused by a change of a road surface structure, so as to obtain a dynamic tire pressure signal.
Optionally, the encoder is mounted on the vehicle hub via a weight pan structure. The encoder includes a road lane mileage measuring system.
Optionally, the road surface dynamic tire pressure detector is further configured to obtain a jerk index according to the jerk; and triggering the visual terminal to display the bumpiness degree and the bumpiness index.
Optionally, the second power supply is a vehicle-mounted power supply, and includes a vehicle-mounted dc power supply system with a dual battery management, and the vehicle-mounted power supply obtains the initial power supply by installing a solar photovoltaic panel on the top of the vehicle.
Optionally, the second power supply provides a 12V/3A stable DC power supply for the road 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, 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 jolt degree index are displayed on the display screen by the visual terminal.
In some embodiments, FIGS. 4-A, 4-B, 4-C, and 4-D are schematic illustrations of a modal excitation force hammer calibration test in which the modal excitation force hammer 4 applies an excitation of force hammer value F to the positive tread of the vehicle tire 12. In fig. 4-a, the angle between the modal excitation hammer 4 and the dynamic tire pressure sensor 8 is 0 degree. 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 force hammer calibration test procedure is as follows: using a modal exciting force hammer to beat the middle position of the left tread of the tire, continuously beating 10 times at intervals of about 3 seconds, repeatedly testing 3 times, and respectively reading the degree of bump FI of the road surface dynamic tire pressure detectoriAnd force hammer indication value F of notebook computeriAnd recording; according to degree of jounce FIiSum force hammer index FiCalculating the measurement accuracy coefficient r of the degree of jouncej。
In some embodiments, as shown in connection with FIG. 5, the method for obtaining a representative value of the bump index measurement accuracy coefficient is as follows:
s301, during a road surface bumping degree measurement accuracy test, keeping the relative level of the tested ground;
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 exciting force hammer and the dynamic tire pressure sensor is 0 degree (as shown in figure 4-A); acquiring a first degree of jounce and a first force hammer indication value, and acquiring a first degree of jounce measurement accuracy coefficient according to the first degree of jounce and the first force hammer indication value;
step S304, under the condition that the included angle between the modal exciting force hammer and the dynamic tire pressure sensor is 90 degrees (as shown in figure 4-B); acquiring a second degree of jounce and a second force indication value, and obtaining a second degree of jounce measurement accuracy coefficient according to the second degree of jounce and the second force indication value;
step S305, under the condition that the included angle between the modal exciting force hammer and the dynamic tire pressure sensor is 180 degrees (as shown in figure 4-C); acquiring a third degree of jounce and a third force hammer indication value, and acquiring a third degree of jounce measurement accuracy coefficient according to the third degree of jounce and the third force hammer indication value;
step S306, under the condition that the included angle between the modal excitation hammer and the dynamic tire pressure sensor is 270 degrees (as shown in figure 4-D); acquiring a fourth degree of jounce and a fourth force indication value, and acquiring a fourth degree of jounce measurement accuracy coefficient according to the fourth degree of jounce and the fourth force indication value;
step S307, obtaining a representative value of the bump degree measurement accuracy coefficient according to the first bump degree measurement accuracy coefficient, the second bump degree measurement accuracy coefficient, the third bump degree measurement accuracy coefficient and the fourth bump degree measurement accuracy coefficient;
step S308, judging whether the representative value of the accuracy coefficient of the measurement of the bumpiness is more than or equal to 0.9; in the case where the representative value of the jerk measurement accuracy coefficient is equal to or greater than 0.9, step S309 is executed; in the case where the jerk measurement accuracy coefficient representative value is <0.9, step S310 is performed;
s309, determining that the measurement accuracy of the road surface dynamic tire pressure detector meets the measurement requirement;
and S310, resetting the parameters of the road surface dynamic tire pressure detector, and re-calibrating the road surface dynamic tire pressure detector until the representative value of the bumpiness measurement accuracy coefficient is greater than or equal to 0.9.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. A road surface dynamic tire pressure detector calibration method based on modal excitation is characterized by comprising 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 to the vehicle tire;
obtaining the degree of jolt; the degree of jounce is used for representing the road surface quality detection condition;
and calibrating the road dynamic tire pressure detector according to the force hammer indication value and the jounce degree.
2. The method of claim 1, wherein the obtaining a force signature comprises:
acquiring an excitation signal value of the modal excitation hammer;
acquiring the sensitivity of the modal excitation force hammer;
and acquiring the force hammer value according to the excitation signal value and the sensitivity.
3. The method of claim 1, wherein the obtaining a jerk comprises:
acquiring a dynamic tire pressure signal of the vehicle tire;
acquiring longitudinal detection mileage of the vehicle tire;
and acquiring the degree of jounce according to the dynamic tire pressure signal and the longitudinal detection mileage.
4. The method of claim 1, wherein calibrating the road dynamic tire pressure gauge based on the force jerk and the jerk comprises:
obtaining a jounce degree accuracy coefficient according to the jounce degree and the force hammer indication value;
acquiring a representative value of the jounce degree measurement accuracy coefficient according to the jounce degree accuracy coefficient;
and resetting the parameters of the road surface dynamic tire pressure detector under the condition that the representative value of the jounce degree measurement accuracy coefficient is smaller than a preset threshold value until the representative value of the jounce degree measurement accuracy coefficient is larger than or equal to the preset threshold value.
5. The utility model provides a road surface developments tire pressure detector calibration system based on mode excitation which characterized in that includes: the system comprises 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 sending 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 to the vehicle tire;
the dynamic tire pressure detection subsystem is used for acquiring the degree of jounce; calibrating the road dynamic tire pressure detector according to the force hammer indication value and the jounce degree; and the degree of jounce is used for representing the road surface quality detection condition.
6. The system of claim 5, 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 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 hammer;
and 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.
7. The system of claim 6, wherein the modal excitation force hammer is a sensor device for measuring the excitation response of the tire structure, and the output signal of the modal excitation force hammer is an ICP dynamic signal.
8. The system of claim 5, 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 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 a dynamic tire pressure signal of the vehicle tire;
the encoder is connected with a 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 degree of jounce according to the dynamic tire pressure signal and the longitudinal detection mileage;
and the visual terminal is used for receiving the force indication value and calibrating the road dynamic tire pressure detector according to the force indication value and the jounce degree.
9. The system of claim 8, wherein the encoder is mounted on the vehicle hub via a weight pan structure.
10. The system of claim 8, wherein the tire pressure gauge is further configured to obtain a jounce index according to the jounce; and triggering the visual terminal to display the bumpiness degree and the bumpiness index.
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