CN105818618A - Tire pressure detection method and device - Google Patents
Tire pressure detection method and device Download PDFInfo
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- CN105818618A CN105818618A CN201610173405.4A CN201610173405A CN105818618A CN 105818618 A CN105818618 A CN 105818618A CN 201610173405 A CN201610173405 A CN 201610173405A CN 105818618 A CN105818618 A CN 105818618A
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- wheel speed
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- calibration
- tire pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0486—Signalling devices actuated by tyre pressure mounted on the wheel or tyre comprising additional sensors in the wheel or tyre mounted monitoring device, e.g. movement sensors, microphones or earth magnetic field sensors
- B60C23/0488—Movement sensor, e.g. for sensing angular speed, acceleration or centripetal force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/06—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle
- B60C23/061—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle by monitoring wheel speed
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- Measuring Fluid Pressure (AREA)
Abstract
The invention relates to a tire pressure detection method and device. The method includes the steps that the wheel speed of each tire in the running process of a vehicle is obtained; the wheel speed accumulated value of each tire within a preset time period is calculated according to the obtained wheel speed; the calibrated wheel speed value of each tire is determined according to the wheel speed accumulated value of the corresponding tire and the corresponding wheel speed calibration factor of the corresponding tire, wherein the wheel speed calibration factors are calibration factors which are stored in advance and used for calibrating the wheel speeds of all the tires meeting the calibration condition to be the unified wheel speed; the difference value of the maximum calibration wheel speed value and the minimum calibration wheel speed value is compared with a preset alarm threshold value; and the tire pressure state of the vehicle is judged according to the comparison result. By the adoption of the method and device, cost can be saved, and meanwhile the tire pressure detection accuracy is improved.
Description
Technical field
The application relates to detection technique field, particularly relates to tire pressure detection method and device.
Background technology
Tire pressure is the air pressure of inside tires, can be referred to as tire pressure.Air pressure too high and too low service life that all can shorten tire, tire pressure is in overvoltage condition higher than tire during certain threshold value, and tire pressure is in under-voltage condition less than tire during certain threshold value.The too low meeting of tire pressure makes carcass deformation increase, and breach easily occurs in sidewall, produces simultaneously and subdues motion, causes excessive heating, promoting ageing of rubber, casing ply is tired, and cord fractures, tire-contact area also can be made to increase, accelerate shoulder wear, it is also possible to cause security incident.The too high meeting of tire pressure makes tyre cord be deformed by excessive extension, and carcass tension declines, and the load making automobile be subject under steam increases, and in case of impact can produce implosion and explosion, the too high crown that also can accelerate of air pressure weares and teares simultaneously, and makes resistance to roll hydraulic performance decline.Therefore, the detection to tire pressure seems particularly significant.
In correlation technique, pressure transducer can be increased at the valve inside of each tire, use wireless communication technique to send the force value of each tire to central processing unit, central processing unit compare according to the tire pressure standard value preset, thus judge that tire pressure is the most normal.
Visible, correlation technique needs to increase pressure transducer and wireless communication module on each tire, hardware cost, installation cost and maintenance cost are higher.
Summary of the invention
The application provides tire pressure detection method and device, the problem high to solve cost in prior art.
First aspect according to the embodiment of the present application, it is provided that a kind of tire pressure detection method, described method includes:
Obtain the wheel speed of each tire in vehicle operation；
According to the acquired each tire of wheel speed calculation wheel speed aggregate-value in preset time period；
The wheel speed calibration factor of the wheel speed aggregate-value according to each tire and this tire determines the calibration wheel speed value of each tire；Described wheel speed calibration factor is the calibration factor that the wheel speed by each tire met under calibration condition prestored is calibrated to unified wheel speed；
Maximum is calibrated the wheel speed value difference with minimum calibration wheel speed value with the alarm threshold value contrast preset；
The tire pressure state of described vehicle is judged according to comparing result.
Second aspect according to the embodiment of the present application, it is provided that a kind of tire pneumatic pressure detector, described device includes:
Wheel speed acquisition module, for obtaining the wheel speed of each tire in vehicle operation；
Aggregate-value determines module, for according to the acquired each tire of wheel speed calculation wheel speed aggregate-value in preset time period；
Calibration wheel speed value determines module, for determining the calibration wheel speed value of each tire according to the wheel speed aggregate-value of each tire and the wheel speed calibration factor of this tire；Described wheel speed calibration factor is the calibration factor that the wheel speed by each tire met under calibration condition prestored is calibrated to unified wheel speed；
Calibration wheel speed value contrast module, for calibrating the wheel speed value difference with minimum calibration wheel speed value with the alarm threshold value contrast preset by maximum；
Tire pressure state detection module, for judging the tire pressure state of described vehicle according to comparing result.
During application the embodiment of the present application, by obtaining the wheel speed of each tire in vehicle operation, and according to the acquired each tire of wheel speed calculation wheel speed aggregate-value in preset time period, the wheel speed calibration factor of the wheel speed aggregate-value according to each tire and this tire determines the calibration wheel speed value of each tire, maximum is calibrated wheel speed value with the difference of minimum calibration wheel speed value with default alarm threshold value contrast, and judge the tire pressure state of described vehicle according to comparing result.Owing to without arranging sensor, wireless module, power supply on each tire of vehicle, hardware cost, cost of installation and maintenance can be avoided；Wheel speed aggregate-value in preset time period is calculated simultaneously, the instantaneous error that instantaneous wheel speed is brought because of turn inside diameter, vibrations, wheel-slip etc. can be avoided；Additionally, wheel speed calibration factor according to wheel speed aggregate-value and tire determines the calibration wheel speed value of each tire, calibration wheel speed value is compared, such that it is able to avoid because the defect inconsistent in the case of air pressure is identical of the diameter of tyres that tire newness degree is different, the degree of wear causes on an equal basis, and then improve the accuracy rate of tire pressure detection.
It should be appreciated that it is only exemplary and explanatory that above general description and details hereinafter describe, the application can not be limited.
Accompanying drawing explanation
Accompanying drawing herein is merged in description and constitutes the part of this specification, it is shown that meet embodiments herein, and for explaining the principle of the application together with description.
Fig. 1 is the application flow chart according to a kind of tire pressure detection method shown in an exemplary embodiment.
Fig. 2 is the application flow chart according to a kind of method determining wheel speed calibration factor shown in an exemplary embodiment.
Fig. 3 is the application flow chart according to the another kind of tire pressure detection method shown in an exemplary embodiment.
Fig. 4 is the application structural representation according to a kind of tire pneumatic pressure detector shown in an exemplary embodiment.
Detailed description of the invention
Here will illustrate exemplary embodiment in detail, its example represents in the accompanying drawings.When explained below relates to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represents same or analogous key element.Embodiment described in following exemplary embodiment does not represent all embodiments consistent with the application.On the contrary, they only with describe in detail in appended claims, the application some in terms of the example of consistent apparatus and method.
It is only merely for describing the purpose of specific embodiment at term used in this application, and is not intended to be limiting the application." a kind of ", " described " and " being somebody's turn to do " of singulative used in the application and appended claims is also intended to include most form, unless context clearly shows that other implications.It is also understood that any or all possible combination that term "and/or" used herein refers to and comprises one or more project of listing being associated.
Although should be appreciated that in the application possible employing term first, second, third, etc. to describe various information, but these information should not necessarily be limited by these terms.These terms are only used for same type of information is distinguished from each other out.Such as, in the case of without departing from the application scope, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.Depend on linguistic context, word as used in this " if " can be construed to " ... time " or " when ... " or " in response to determining ".
In order to realize the detection to tire pressure, correlation technique can arrange pressure transducer at the valve inside of each tire, baroceptor can also be set in inside tires, then wireless communication technique is used to send the force value of each tire/atmospheric pressure value to central processing unit, compared according to the tire pressure standard value preset by central processing unit, thus judge that tire pressure is the most normal.
But this mode, not only pressure transducer/baroceptor is set on each tire, there is provision of wireless communication module, also need to arrange power module to solve powerup issue, hardware cost is the highest, and installation cost and maintenance cost are the highest.
In order to avoid the problem that cost is high, disclosure one tire pressure detection method, by calculating each tire wheel speed aggregate-value in preset time period, and wheel speed aggregate-value is carried out the calibration wheel speed value of the calibration each tire of acquisition, maximum is calibrated the wheel speed value difference with minimum calibration wheel speed value with the alarm threshold value contrast preset, the tire pressure state of described vehicle is judged according to comparing result, thus utilize wheel speed to realize the detection to wheel load, avoid on vehicle tyre, arrange pressure transducer/baroceptor, wireless module, the hardware cost that power supply etc. bring, cost of installation and maintenance.
As it is shown in figure 1, Fig. 1 is the application flow chart according to a kind of tire pressure detection method shown in an exemplary embodiment, comprise the following steps 101 to step 105:
In a step 101, the wheel speed of each tire in vehicle operation is obtained.
In the embodiment of the present application, wheel speed be the speed of tire, such as wheel speed can be the linear velocity etc. of tire.As an example, due to onboard diagnostic system (On-BoardDiagnostic, OBD) data such as engine speed, speed, steering wheel angle, tire wheel speed are included, therefore wheel speed can directly be obtained from OBD, in addition, can also adopt the wheel speed obtaining tire in other ways, this is no longer going to repeat them.
Visible, the present embodiment directly obtains wheel speed from OBD, it is to avoid arrange hardware cost, cost of installation and maintenance that pressure transducer/baroceptor, wireless module, power supply etc. bring on vehicle tyre.
In a step 102, according to the acquired each tire of wheel speed calculation wheel speed aggregate-value in preset time period.
After obtaining wheel speed, each tire wheel speed aggregate-value in preset time period in this vehicle can be calculated.Preset time period is the time for adding up wheel speed set in advance, and the purpose of accumulative wheel speed is the error-detecting brought in order to avoid instantaneous wheel speed.
In an optional implementation, preset time period can be the time that in vehicle operation, wheel speed meets normal distribution.Visible, the wheel speed meeting normal distribution is added up, and accumulative wheel speed aggregate-value is compared and judges, the instantaneous error brought because of turn inside diameter, vibrations, wheel-slip etc. in can avoiding instantaneous wheel speed relatively, the most also detection will be caused to postpone due to the overlong time that preset time period is arranged, thus avoid postponing the loss that detection brings.
Such as, in the common scene set, the span of preset time period can be 4.5 minutes to 5.5 minutes, when particularly preset time period is 5 minutes, both can avoid instantaneous error, and can avoid again postponing the loss that detection brings.Wherein, the common scene of setting can be the shallower roads such as highway, gets rid of the scene of each wheel wheel speed in snowfield, winding road etc. have a strong impact on vehicle.
It addition, for different scenes, it is also possible to different preset time period is set according to the difference of scene.Such as, the Preset Time segment length that winding road is corresponding preset time period is more corresponding than mild highway.
Further, the erroneous judgement caused in order to avoid situations such as turning, traversing, tyre slips, particularly avoid road surface excessively uneven or erroneous judgement that the situation such as too much of turning causes, in non-common scene, can the value of preset time period be arranged is bigger, allows error cancel out each other, thus avoids wrong report.Such as, in different application scenarios, the duration of preset time period can be determined by the accounting of invalid mileage.Wherein, invalid mileage refers to mileage when vehicle does not has linear uniform motion or approximates linear uniform motion.As, invalid mileage accounts for 50%, then the preset time period under this scene at least doubles than the preset time period under linear uniform motion or approximation linear uniform motion.
In step 103, the calibration wheel speed value of each tire is determined according to the wheel speed aggregate-value of each tire and the wheel speed calibration factor of this tire.
Described wheel speed calibration factor is the calibration factor that the wheel speed by each tire met under calibration condition prestored is calibrated to unified wheel speed.When determining calibration factor, it can be determined that whether the tire pressure of vehicle meets calibration condition, in the case of meeting calibration condition, just carry out calibration obtain calibration factor.Calibration condition can be that tire pressure is normal, i.e. wheel speed calibration factor is the calibration factor that the wheel speed of subnormal for tire pressure each tire is calibrated to unified wheel speed.Such as can check the tire pressure of each tire, judge that according to the tire pressure detected the tire pressure of this tire is the most normal.And for example, the acquiescence normal scene of tire pressure can be preset, when default scene occurs, then judge that tire pressure is normal.The scene preset can be the scenes such as the tire that just tire to vehicle charges gas, just more new vehicle.After judging that tire pressure is normal, calibration factor can be determined according to the data in vehicle travel process.
Wheel speed calibration factor for the wheel speed aggregate-value according to each tire Yu this tire determines the calibration wheel speed value of each tire, can be different according to the difference of wheel speed calibration factor.Such as, when the ratio that wheel speed calibration factor is standard value and wheel speed, the wheel speed aggregate-value of each tire is multiplied with the wheel speed calibration factor of this tire, it is thus achieved that the calibration wheel speed value of each tire.When the ratio that wheel speed calibration factor is wheel speed and standard value, the wheel speed calibration factor of the wheel speed aggregate-value of each tire with this tire is divided by, it is thus achieved that the calibration wheel speed value of each tire.
At step 104, maximum is calibrated the wheel speed value difference with minimum calibration wheel speed value with the alarm threshold value contrast preset.
In this step, can first seek the difference of maximum calibration wheel speed value and minimum calibration wheel speed value, then difference is contrasted with the alarm threshold value preset.Visible, calibration wheel speed value in preset time period is compared, because the instantaneous error brought of the instantaneous velocity such as turn inside diameter, vibrations, wheel-slip in being possible not only to avoid instantaneous wheel speed relatively, it is also possible to avoid because the defect inconsistent in the case of air pressure is identical of the diameter of tyres that tire newness degree is different, the degree of wear causes on an equal basis；Meanwhile, maximum is calibrated wheel speed value with the difference of minimum calibration wheel speed value with default alarm threshold value contrast, can avoid specifying the wheel speed of two tires to compare the erroneous judgement caused, improve Detection accuracy.
Alarm threshold value is the threshold value of the tire pressure state for judging vehicle set in advance.In one implementation, road conditions and the wheel speed of vehicle when alarm threshold value can travel according to type of vehicle, vehicle determine, will travel with different wheel speeds under different road conditions by different types of vehicle, through testing many times, in the case of tire pressure condition adjudgement is correct, obtain alarm threshold value.It is 5 minutes with preset time period below, as a example by car type is passenger car, enumerates the most several groups of data and illustrate, it is to be understood that be not limited to following data in testing:
Visible, the span of alarm threshold value can be 8.5km/h to 11.5km/h, particularly during 10km/h, can reduce rate of false alarm.
In step 105, the tire pressure state of described vehicle is judged according to comparing result.
In this step, the tire pressure state of vehicle can be judged according to comparing result.In an optional implementation, when described maximum calibration wheel speed value calibrates the difference of wheel speed value less than alarm threshold value with described minimum, it is possible to determine that the tire pressure of vehicle is in normal condition.When described maximum calibration wheel speed value calibrates the difference of wheel speed value more than or equal to described alarm threshold value with described minimum, it is possible to determine that the tire pressure of described vehicle is in abnormality.
Further, it is also possible to the tire pressure state of described vehicle is reminded.Such as, when the tire pressure of vehicle is in normal condition, can not remind, it is also possible to remind tire pressure normal.When detecting that tire pressure is in abnormality, can carry out warning reminding, user can detect according to each tire to vehicle of reporting to the police.
In an optional implementation, owing to generally tire does not haves overvoltage condition, minimum then can be calibrated tire corresponding to wheel speed value and be judged to that there is normal tire pressure, when the difference of maximum calibration wheel speed value with minimum calibration wheel speed value is more than or equal to the alarm threshold value preset, it is determined that the tire that maximum calibration wheel speed value is corresponding is in under-voltage condition.
Visible, the tire being in under-voltage condition can be detected by the way, it is to avoid manually progressively detect the troublesome operation caused.
In order to remind user to detect and repairing tyre in time when tyre underpressure, it is to avoid the infringement that tyre underpressure causes, when the tire judging that maximum calibration wheel speed value is corresponding is in under-voltage condition, the tire being in under-voltage condition is carried out warning reminding.
Wherein, the mode of warning can be a variety of, such as the prompting of display alarm, flashing lamp or sound prompting etc..Display alarm can be on a display screen the tire being in under-voltage condition to be carried out display alarm prompting.It can be to utilize different lamp to flash different colors to remind that flashing lamp is reminded, and four tires, first lamp represent that the front-wheel on the left side is under-voltage when dodging red such as to utilize four lamps to represent, second lamp represents when dodging red that the front-wheel on the right is under-voltage etc..Sound prompting can be voice reminder, such as, utilize voice that the under-voltage condition of different kinds of tyre is carried out voice broadcast.Sound prompting can also is that the tinkle of bells is reminded, such as, utilize different the tinkle of bells that the state of different kinds of tyre is carried out warning reminding etc..
It is understood that a kind of alerting pattern can be used during warning reminding, it is also possible to combine multiple alerting pattern.Such as, display screen shows under-voltage tire, and coordinates the tinkle of bells of warning, then can increase the variation of prompting, reminds the timely inspection and maintenance of user.
Further, can select that minimum is calibrated tire corresponding to wheel speed value according to different scene and be judged to that there is normal tire pressure, or maximum is calibrated tire corresponding to wheel speed value be judged to that there is normal tire pressure.Such as, when judging current scene as default special screne, maximum is calibrated tire corresponding to wheel speed value and is judged to that there is normal tire pressure.The most just charge the vehicle of nausea when being currently running, in order to avoid because inflation too much causes tyre overpressure, then maximum being calibrated tire corresponding to wheel speed value and be judged to that there is normal tire pressure.
Based on this, can be in implementation at another, when the difference of maximum calibration wheel speed value and minimum calibration wheel speed value is more than or equal to alarm threshold value, it is determined that the tire that minimum calibration wheel speed value is corresponding is in overvoltage condition.Further, when the tire judging that minimum calibration wheel speed value is corresponding is in overvoltage condition, the tire being in overvoltage condition is carried out warning reminding.
Visible, the tire being in overvoltage condition can be detected by the way, it is to avoid manually progressively detect the troublesome operation caused.
As seen from the above-described embodiment, by obtaining the wheel speed of each tire in vehicle operation, and according to the acquired each tire of wheel speed calculation wheel speed aggregate-value in preset time period, the wheel speed calibration factor of the wheel speed aggregate-value according to each tire and this tire determines the calibration wheel speed value of each tire, maximum is calibrated wheel speed value with the difference of minimum calibration wheel speed value with default alarm threshold value contrast, and judge the tire pressure state of described vehicle according to comparing result.Owing to without arranging sensor, wireless module, power supply on vehicle tyre, hardware cost, cost of installation and maintenance can be avoided；Wheel speed aggregate-value in preset time period is calculated simultaneously, the instantaneous error that instantaneous wheel speed is brought because of turn inside diameter, vibrations, wheel-slip etc. can be avoided；Additionally, wheel speed calibration factor according to wheel speed aggregate-value and tire determines the calibration wheel speed value of each tire, calibration wheel speed value is compared, such that it is able to avoid because the defect inconsistent in the case of air pressure is identical of the diameter of tyres that tire newness degree is different, the degree of wear causes on an equal basis, and then improve the accuracy rate of tire pressure detection.
In an optional implementation, the application is also disclosed a kind of method determining wheel speed calibration factor, as in figure 2 it is shown, Fig. 2 is the application flow chart according to a kind of method determining wheel speed calibration factor shown in an exemplary embodiment, comprise the following steps 201 to step 204:
In step 201, when the tire pressure of vehicle meets calibration condition, obtain the target wheel speed of each tire when described vehicle runs under this tire pressure.
Wherein, target wheel speed is the tire pressure of the vehicle wheel speed of tire when meeting calibration condition, in order to the wheel speed in same step 101 is distinguished, at this by its named target wheel speed.
Further, target wheel speed can also be that the tire pressure of vehicle is when meeting calibration condition, and the vehicle wheel speed of each tire, described predefined uniform motion and/or linear motion when carrying out predefined uniform motion and/or linear motion determine with the comparing result of the kinematic feature factor threshold value of setting according to the kinematic feature factor of described vehicle.
In step 202., according to the acquired each tire of target wheel speed calculation target wheel speed aggregate-value in preset time period.
In this step, each tire target wheel speed aggregate-value in preset time period can be calculated respectively according to acquired target wheel speed.
In step 203, the meansigma methods of described target wheel speed aggregate-value is calculated.
Wherein, the meansigma methods calculating target wheel speed aggregate-value can be to be sued for peace by target wheel speed aggregate-value, then divided by tire number.It is for instance possible to use below equation calculating meansigma methods:
SUM′P=(SUM 'A+SUM′B+SUM′C+SUM′D)/4
Wherein, SUM 'PRepresent meansigma methods, SUM 'A、SUM′B、SUM′C、SUM′DRepresent A wheel, B wheel, C wheel and the target wheel speed aggregate-value of D wheel respectively.
In step 204, the target wheel speed aggregate-value according to described meansigma methods and each tire determines the wheel speed calibration factor of corresponding tire.
Meansigma methods is determined the wheel speed calibration factor of each tire by the present embodiment as standard value.On the one hand, can by described meansigma methods respectively target wheel speed aggregate-value with each tire be divided by, it is thus achieved that the wheel speed calibration factor of corresponding tire.
Such as, PA=SUM 'P/SUM′A, PB=SUM 'P/SUM′B, PC=SUM 'P/SUM′C, PD=SUM 'P/SUM′D, wherein, PARepresent the wheel speed calibration factor of A wheel, PBRepresent the wheel speed calibration factor of B wheel, PCRepresent the wheel speed calibration factor of C wheel, PDRepresent the wheel speed calibration factor of D wheel.
On the other hand, the target wheel speed aggregate-value of each tire can be divided by with described meansigma methods respectively, it is thus achieved that the wheel speed calibration factor of corresponding tire.
As seen from the above-described embodiment, utilize the target wheel speed aggregate-value in preset time period to calculate wheel speed calibration factor, the instantaneous error that instantaneous wheel speed is brought because of turn inside diameter, vibrations, wheel-slip etc. can be avoided, thus improve the accuracy rate of wheel speed calibration factor.
Various technical characteristics in embodiment of above can arbitrarily be combined, as long as there is not conflict or contradiction in the combination between feature, but as space is limited, describe one by one, the various technical characteristics in the most above-mentioned embodiment be arbitrarily combined falling within the scope of this specification application.
The application enumerates one of which combination and illustrates, as it is shown on figure 3, Fig. 3 is the application flow chart according to the another kind of tire pressure detection method shown in an exemplary embodiment, comprises the following steps 301 to step 306:
In step 301, the wheel speed of each tire in vehicle operation is obtained.
In step 302, the wheel speed of acquired each tire is added up respectively.
Following formula such as can be used the wheel speed of each tire obtained to be added up respectively:
SUMA takes turns=SUMA takes turns+UA takes turns
SUMB takes turns=SUMB takes turns+UB takes turns
SUMC takes turns=SUMC takes turns+UC takes turns
SUMD takes turns=SUMD takes turns+UD takes turns
Wherein, SUMA takes turns、SUMB takes turns、SUMC takes turns、SUMD takes turnsRepresent A wheel, B wheel, C wheel and the wheel speed aggregate-value of D wheel, U respectivelyA takes turns、UB takes turns、UC takes turns、UD takes turnsRepresent A wheel, B wheel, C wheel and the current instantaneous wheel speed obtained of D wheel respectively.
In step 303, it is judged that whether the cumulative time reaches preset time period, if so, obtain each tire wheel speed aggregate-value in preset time period, then enter step 304, otherwise return step 301.
In step 304, the calibration wheel speed value of each tire is determined according to the wheel speed aggregate-value of each tire and the wheel speed calibration factor of this tire；Described wheel speed calibration factor is the calibration factor that the wheel speed by each tire met under calibration condition prestored is calibrated to unified wheel speed.
In step 305, when the difference of maximum calibration wheel speed value with minimum calibration wheel speed value is more than or equal to the alarm threshold value preset, it is determined that the tire that maximum calibration wheel speed value is corresponding is in under-voltage condition.
Within step 306, the tire being in under-voltage condition is carried out warning reminding.
As seen from the above-described embodiment, owing to without arranging pressure transducer/baroceptor, wireless module, power supply on vehicle tyre, hardware cost, cost of installation and maintenance can be avoided；Wheel speed in each tire preset time period is added up, the instantaneous error brought because of turn inside diameter, vibrations, wheel-slip etc. in can avoiding instantaneous wheel speed relatively simultaneously；The most also wheel speed aggregate-value is calibrated, calibration wheel speed value is compared, such that it is able to avoid because the defect inconsistent in the case of air pressure is identical of the diameter of tyres that tire newness degree is different, the degree of wear causes on an equal basis, and then improve the accuracy rate of under-voltage detection.
Corresponding with the embodiment of the application tire pressure detection method, present invention also provides the embodiment of tire pneumatic pressure detector.
Seeing Fig. 4, Fig. 4 is the application structural representation according to a kind of tire pneumatic pressure detector shown in an exemplary embodiment.Described device includes: wheel speed acquisition module 410, aggregate-value determine that module 420, calibration wheel speed value determine module 430, calibration wheel speed value contrast module 440 and tire pressure state detection module 450.
Wherein, described wheel speed acquisition module 410, for obtaining the wheel speed of each tire in vehicle operation；
Described aggregate-value determines module 420, for according to the acquired each tire of wheel speed calculation wheel speed aggregate-value in preset time period；
Described calibration wheel speed value determines module 430, for determining the calibration wheel speed value of each tire according to the wheel speed aggregate-value of each tire and the wheel speed calibration factor of this tire；Described wheel speed calibration factor is the calibration factor that the wheel speed by each tire met under calibration condition prestored is calibrated to unified wheel speed；
Described calibration wheel speed value contrast module 440, for calibrating the wheel speed value difference with minimum calibration wheel speed value with the alarm threshold value contrast preset by maximum；
Described tire pressure state detection module 450, for judging the tire pressure state of described vehicle according to comparing result.
As seen from the above-described embodiment, by obtaining the wheel speed of each tire in vehicle operation, and according to the acquired each tire of wheel speed calculation wheel speed aggregate-value in preset time period, the wheel speed calibration factor of the wheel speed aggregate-value according to each tire and this tire determines the calibration wheel speed value of each tire, maximum is calibrated wheel speed value with the difference of minimum calibration wheel speed value with default alarm threshold value contrast, and judge the tire pressure state of described vehicle according to comparing result.Owing to without arranging sensor, wireless module, power supply on vehicle tyre, can avoid arranging hardware cost, the cost of installation and maintenance brought；Wheel speed aggregate-value in preset time period is calculated simultaneously, the instantaneous error that instantaneous wheel speed is brought because of turn inside diameter, vibrations, wheel-slip etc. can be avoided；Additionally, wheel speed calibration factor according to wheel speed aggregate-value and tire determines the calibration wheel speed value of each tire, calibration wheel speed value is compared, such that it is able to avoid because the defect inconsistent in the case of air pressure is identical of the diameter of tyres that tire newness degree is different, the degree of wear causes on an equal basis, and then improve the accuracy rate of tire pressure detection.
In an optional implementation, described device also includes that calibration factor determines module (Fig. 4 is not shown).
Described calibration factor determines module, for when the tire pressure of vehicle meets calibration condition, obtains the target wheel speed of each tire when described vehicle runs under this tire pressure；According to the acquired each tire of target wheel speed calculation target wheel speed aggregate-value in preset time period；Calculate the meansigma methods of described target wheel speed aggregate-value；Target wheel speed aggregate-value according to described meansigma methods and each tire determines the wheel speed calibration factor of corresponding tire.
In an optional implementation, described preset time period is the time that in vehicle operation, wheel speed meets normal distribution.
As seen from the above-described embodiment, the wheel speed meeting normal distribution is added up, and accumulative wheel speed aggregate-value is compared and judges, the instantaneous error that instantaneous wheel speed is brought can be avoided, the most also detection will be caused to postpone due to the overlong time that preset time period is arranged, thus avoid postponing the loss that detection brings.
In an optional implementation, described tire pressure state detection module includes tire pressure state-detection submodule (Fig. 4 is not shown).
Wherein, described tire pressure state-detection submodule, for when the difference of described maximum calibration wheel speed value and described minimum calibration wheel speed value is more than or equal to described alarm threshold value, it is determined that the tire pressure of described vehicle is in abnormality.
As seen from the above-described embodiment, when the difference of described maximum wheel speed aggregate-value with described minimum wheel speed aggregate-value is more than or equal to described alarm threshold value, it is possible to determine that the tire pressure of described vehicle is in abnormality, in order to user carries out inspection and maintenance to the tire of vehicle.
In an optional implementation, described tire pressure is in abnormality and includes: the tire that described maximum wheel speed aggregate-value is corresponding is in under-voltage condition.
As seen from the above-described embodiment, can detect by the way and be in the tire of under-voltage condition, it is to avoid manually progressively detect the troublesome operation caused.
In another optional implementation, described tire pressure is in abnormality and includes: the tire that described minimum wheel speed aggregate-value is corresponding is in overvoltage condition.
As seen from the above-described embodiment, can detect by the way and be in the tire of overvoltage condition, it is to avoid manually progressively detect the troublesome operation caused.
In an optional implementation, described device also includes tire pressure prompting module (Fig. 3 is not shown).
Wherein, described tire pressure prompting module, for reminding the tire pressure state of described vehicle.Such as, when tire pressure prompting module is for being in under-voltage condition at the tire judging that maximum calibration wheel speed value is corresponding, the tire being in under-voltage condition is carried out warning reminding.And for example, when tire pressure prompting module is for being in overvoltage condition at the tire judging that minimum calibration wheel speed value is corresponding, the tire being in overvoltage condition is carried out warning reminding.
What in said apparatus, the function of modules and the process that realizes of effect specifically referred in said method corresponding step realizes process, does not repeats them here.
For device embodiment, owing to it corresponds essentially to embodiment of the method, so the part that relevant part sees embodiment of the method illustrates.Device embodiment described above is only schematically, the wherein said module illustrated as separating component can be or may not be physically separate, the parts shown as module can be or may not be physical module, i.e. may be located at a place, or can also be distributed on multiple mixed-media network modules mixed-media.Some or all of module therein can be selected according to the actual needs to realize the purpose of the application scheme.Those of ordinary skill in the art, in the case of not paying creative work, are i.e. appreciated that and implement.
Those skilled in the art, after considering description and putting into practice invention disclosed herein, will readily occur to other embodiment of the application.The application is intended to any modification, purposes or the adaptations of the application, and these modification, purposes or adaptations are followed the general principle of the application and include the undocumented common knowledge in the art of the application or conventional techniques means.Description and embodiments is considered only as exemplary, and the true scope of the application and spirit are pointed out by claim below.
It should be appreciated that the application is not limited to precision architecture described above and illustrated in the accompanying drawings, and various modifications and changes can carried out without departing from the scope.Scope of the present application is only limited by appended claim.
Claims (10)
1. a tire pressure detection method, it is characterised in that described method includes:
Obtain the wheel speed of each tire in vehicle operation；
According to the acquired each tire of wheel speed calculation wheel speed aggregate-value in preset time period；
The wheel speed calibration factor of the wheel speed aggregate-value according to each tire and this tire determines the calibration wheel speed value of each tire；Described wheel speed calibration factor is the calibration factor that the wheel speed by each tire met under calibration condition prestored is calibrated to unified wheel speed；
Maximum is calibrated the wheel speed value difference with minimum calibration wheel speed value with the alarm threshold value contrast preset；
The tire pressure state of described vehicle is judged according to comparing result.
Method the most according to claim 1, it is characterised in that the determination step of described wheel speed calibration factor, including:
When the tire pressure of vehicle meets calibration condition, obtain the target wheel speed of each tire when described vehicle runs under this tire pressure；
According to the acquired each tire of target wheel speed calculation target wheel speed aggregate-value in preset time period；
Calculate the meansigma methods of described target wheel speed aggregate-value；
Target wheel speed aggregate-value according to described meansigma methods and each tire determines the wheel speed calibration factor of corresponding tire.
Method the most according to claim 1, it is characterised in that the described tire pressure state judging described vehicle according to comparing result, including:
When described maximum calibration wheel speed value calibrates the difference of wheel speed value more than or equal to described alarm threshold value with described minimum, it is determined that the tire pressure of described vehicle is in abnormality；Described tire pressure is in abnormality and includes: the tire that described maximum calibration wheel speed value is corresponding is in under-voltage condition, or the described minimum tire calibrating wheel speed value corresponding is in overvoltage condition.
Method the most according to claim 1, it is characterised in that described preset time period is the time that in vehicle operation, wheel speed meets normal distribution.
5. according to the arbitrary described method of Claims 1-4, it is characterised in that described method also includes:
The tire pressure state of described vehicle is reminded.
6. a tire pneumatic pressure detector, it is characterised in that described device includes:
Wheel speed acquisition module, for obtaining the wheel speed of each tire in vehicle operation；
Aggregate-value determines module, for according to the acquired each tire of wheel speed calculation wheel speed aggregate-value in preset time period；
Calibration wheel speed value determines module, for determining the calibration wheel speed value of each tire according to the wheel speed aggregate-value of each tire and the wheel speed calibration factor of this tire；Described wheel speed calibration factor is the calibration factor that the wheel speed by each tire met under calibration condition prestored is calibrated to unified wheel speed；
Calibration wheel speed value contrast module, for calibrating the wheel speed value difference with minimum calibration wheel speed value with the alarm threshold value contrast preset by maximum；
Tire pressure state detection module, for judging the tire pressure state of described vehicle according to comparing result.
Device the most according to claim 6, it is characterised in that described device also includes that calibration factor determines module, for when the tire pressure of vehicle meets calibration condition, obtains the target wheel speed of each tire when described vehicle runs under this tire pressure；According to the acquired each tire of target wheel speed calculation target wheel speed aggregate-value in preset time period；Calculate the meansigma methods of described target wheel speed aggregate-value；Target wheel speed aggregate-value according to described meansigma methods and each tire determines the wheel speed calibration factor of corresponding tire.
Device the most according to claim 6, it is characterised in that described tire pressure state detection module includes:
Tire pressure state-detection submodule, for when the difference of described maximum calibration wheel speed value and described minimum calibration wheel speed value is more than or equal to described alarm threshold value, it is determined that the tire pressure of described vehicle is in abnormality；Described tire pressure is in abnormality and includes: the tire that described maximum calibration wheel speed value is corresponding is in under-voltage condition, or the described minimum tire calibrating wheel speed value corresponding is in overvoltage condition.
Device the most according to claim 6, it is characterised in that described preset time period is the time that in vehicle operation, wheel speed meets normal distribution.
10. according to the arbitrary described device of claim 6 to 9, it is characterised in that described device also includes tire pressure prompting module, for the tire pressure state of described vehicle is reminded.
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| CN201610173405.4A CN105818618B (en) | 2016-03-24 | 2016-03-24 | Tire pressure detection method and device |
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| CN114648414A (en) * | 2022-05-20 | 2022-06-21 | 深圳联友科技有限公司 | Automobile tire insurance risk evaluation and control method and system |
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