CN106114080B - Tire pressure monitoring early warning system and method based on the absolute comparison method of wheel pulse number - Google Patents
Tire pressure monitoring early warning system and method based on the absolute comparison method of wheel pulse number Download PDFInfo
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- CN106114080B CN106114080B CN201610608134.0A CN201610608134A CN106114080B CN 106114080 B CN106114080 B CN 106114080B CN 201610608134 A CN201610608134 A CN 201610608134A CN 106114080 B CN106114080 B CN 106114080B
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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
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Abstract
The invention discloses a kind of tire pressure monitoring early warning systems based on the absolute comparison method of wheel pulse number, comprising: vehicle wheel rotation umber of pulse monitoring unit, for generating, receiving each vehicle wheel rotation umber of pulse information；Wheel pulse number operation judgement unit, wheel standards umber of pulse is established as benchmark for each wheel pulse number information according to acquisition and will be compared after the actual measurement umber of pulse amendment of each wheel with respective calibration pulse number, whether abnormal differentiate tire pressure, and is sent to tire pressure display unit and differentiate result information.It is low in cost, it can differentiate that too low and three-wheel tire pressure too low situation and accurately identifies four-wheel deficency situation in various degree simultaneously simultaneously to two-wheeled tire pressure simultaneously；It can differentiate the identical vehicle of front and back wheel standard tire pressure and accurately identify the different vehicle of front and back wheel standard tire pressure.
Description
Technical field
The present invention relates to automobile tire pressure monitoring alarm system technical fields, are based on wheel pulse more particularly to one kind
Number
The tire pressure monitoring early warning system and method for absolute comparison method.
Background technique
Mass data shows: in use, monthly leak rate reaches 1%~4% to tire to automobile, and it is long to will lead to tire
Phase is run with the situation lower than normal tire pressure, increases squeegee action, strength reduction, accident of eventually blowing out, and is caused tight
The loss of personal property of weight；Meanwhile tire pressure reduce, can also oversize tyre rolling resistance, increase Fuel consumption.Therefore, right
Air pressure of automobile tire real-time monitoring finds abnormal tyre pressure and alarm, facilitates driver and tire pressure is maintained to be in standard shape
State, effectively improve vehicle driving it is safe while, realize energy-saving purpose.
In the prior art, tire pressure monitoring system mainly has direct-type and indirect type two major classes: direct-type be in tire or
It installing pressure sensor on valve cock additional and directly measures tire pressure, surveyed tire pressure data are wirelessly sent to receiver,
Be then displayed on monitor, or shown by forms such as sound, light, have response fast, high sensitivity, can real-time display tire pressure
The features such as, but mounting process is complicated, and it is at high cost, and sensor is shaken, high temperature, high pressure and centrifugal force are acted on and be wirelessly transferred
Data etc. influence, and functional reliability reduces, and the scheme of waste battery are in addition preferably handled still without one, thus indirect type
TPMS research receives great attention.Indirect type TPMS is differentiated by ECU by special algorithm operation by obtaining wheel speed information
Whether tire pressure normal, because its do not increase part, constitute simple and direct, energy consumption less, it is low in cost, convenient for promoting the features such as, attracted each
World-famous motor corporation endeavours its research.
Indirect type TPMS technology now has developed into three kinds of wheel speed diagnostic method, frequency spectrum diagnostic method, umber of pulse diagnostic method methods,
Middle wheel speed diagnostic method is only capable of identification single-wheel tire pressure deficency situation and not can designate that deficency tire location, frequency spectrum diagnostic method by road conditions and
The factors such as vehicle self-technique situation are affected, and are only capable of being higher than 30km/h in speed and work lower than between 100km/h, surpass
This range rate of false alarm is higher out, therefore the technology still fails to reach popularization and application；Pulse diagnostic method be by each wheel pulse number with
The average value of the vehicle wheel pulse number compares, and whether differentiates tire pressure by differentiating whether its difference is greater than corresponding threshold value
Abnormal, although this method can recognize that the position of abnormal tyre pressure tire, can work normally when speed reaches 10Km/h, even if
Speed reaches 120km/h and is also able to maintain working properly, but cannot identify under ladder tire pressure condition whether tire pressure is abnormal, can not
Deficency situation, the present invention are perfect using each absolute comparison method of wheel pulse number for these problems in various degree simultaneously for 4 wheel of identification
Umber of pulse diagnostic method indirect type TPMS technology.
Summary of the invention
For technological deficiency existing for TPMS wheel pulse number capacitive equipments, the purpose of the present invention is to propose to a kind of bases
In the tire pressure monitoring early warning system and method for the absolute comparison method of wheel pulse number, keeping wheel pulse diagnostic method that can accurately know
Not Chu abnormal tire pressure wheel this feature of position while, can differentiate that two-wheeled tire pressure is too low simultaneously and three-wheel tire pressure mistake simultaneously
Low situation, and four-wheel different degrees of deficency situation simultaneously can be accurately identified；It can differentiate the identical vehicle of front and back wheel standard tire pressure
, and the different vehicle of front and back wheel standard tire pressure can be accurately identified.
The technical scheme is that
A kind of tire pressure monitoring early warning system based on the absolute comparison method of wheel pulse number characterized by comprising
One vehicle wheel rotation umber of pulse monitoring unit, for generating, receiving each vehicle wheel rotation umber of pulse information；
One wheel pulse number operation judgement unit, for establishing wheel standards arteries and veins according to each wheel pulse number information of acquisition
Number is rushed as benchmark and will be compared after the actual measurement umber of pulse amendment of each wheel with respective calibration pulse number, whether differentiates tire pressure
It is abnormal, and sent to tire pressure display unit and differentiate result information.
Preferably, the wheel pulse number operation judgement unit includes:
Calibration pulse base standard establishes unit, and the calibration pulse base for establishing each wheel is quasi-, the actual measurement arteries and veins for each wheel
Number is rushed to be compared with respective calibration pulse number；
Wheel pulse number amending unit is modified each wheel actual measurement umber of pulse, makes corresponding to revised umber of pulse
Wheel rolling distance be equidistant with wheel rolling corresponding to calibration pulse number or approximately equal；
Tire pressure condition discrimination alarm unit differentiates by comparing the difference of each wheel corrected impulse number and calibration pulse number
The position of tire pressure Status Level and abnormal tyre pressure wheel sends wheel pulse number to tire pressure display unit and differentiates result letter
Breath.
Preferably, the wheel pulse number operation judgement unit further includes self study unit, for working as vehicle wheel roll radius
When mutation, self study is carried out, each wheel standards umber of pulse benchmark is updated.Vehicle wheel roll radius mutation includes tire rotation, tire
It updates, tire maintenance tonifying Qi and four-wheel aligner etc., vehicle is steady with middling speed on the straight road of good road conditions in the learning process
It is carried out in traveling, it is insensitive to speed size requirements.
Preferably, when Vehicular turn, the wheel pulse number amending unit is to axle wheel pulse number phase when turning to
Mutually amendment, amendment afterpulse number are the product for surveying umber of pulse and correction factor.
Preferably, after receiving vehicle brake signal perhaps wheel slip signal reject braking process in or vehicle
Each wheel pulse number counted in slipping.
Preferably, the tire pressure display unit is the instrument board coupled with vehicle-mounted CAN system or separate display screens,
Show position and the tire pressure high and low level of abnormal tyre pressure wheel.
The invention also discloses a kind of tire pressure monitoring method for early warning based on the absolute comparison method of wheel pulse number, feature exists
In, comprising the following steps:
S01: with certain speed traveling certain distance and the umber of pulse of vehicle wheel rotation is recorded as the wheel in standard tire pressure
Calibration pulse number
S02: the average value N of four wheel standards umber of pulses is sought respectively0With each wheel standards umber of pulseThe ratio betweenVehicle
It takes turns each monitoring cycle of umber of pulse and umber of pulse N is surveyed with each wheeliWithProduct in minimum value reach calibration pulse number
Average value N0Until；
S03: the difference Δ N of each wheel actual measurement umber of pulse and corresponding calibration pulse number is soughtiAnd to difference DELTA NiIt arranges by size
Sequence is modified each wheel actual measurement umber of pulse, to wheel pulse number correction valueIt is fitted to about Δ NiFunction f (Δ
Ni), wheel rolling distance corresponding to revised umber of pulse be equidistant with wheel rolling corresponding to calibration pulse number or
It is approximately equal；
S04: by revised each wheel pulse number and respective calibration pulse number absolutely compared with differenceWith it is corresponding
High tire pressure threshold value ΔHWith low tire pressure threshold value ΔLIt compares, ifAndThen it is determined as the tire
Press through height；IfAndThen determine that the wheel tyre pressure is too low.
Preferably, in the step S01, when vehicle wheel roll radius mutation, self study is carried out, each wheel standards arteries and veins is updated
Rush base standard.
Preferably, in the step S02, function f (Δ Ni) by approximate solution by iterative method or using fitting process and repeatedly
It is solved jointly for method.
Preferably, further include that tire pressure shows step:
Using green LED lamppost indicate tire pressure in 115%~85% standard tire pressure range, it is green when tire pressure is standard tire pressure
Coloured light column highest, column of green light, which shortens, indicates that tire pressure changes, but also in normal operating range；
When tire pressure is the 85% of standard tire pressure, column of green light, which shorten to zero, becomes column of red light, the higher expression of column of red light
Gas leakage is more serious, and when tire pressure drops to the 60% of standard tire pressure, buzzer is also alarmed ring while column of red light flashing；
The excessively high degree of tire pressure is indicated using orange-yellow lamppost, when tire pressure is increased to the 115% of standard tire pressure, becomes orange
Yellow light beam, when tire pressure is increased to the 140% of standard tire pressure, buzzer is also alarmed ring while the flashing of orange-yellow light beam
It rings.
Wheel pulse number correction valueBoth can be changed with modifying factor speed causes vehicle wheel roll radius variation to cartwheel roll
The influence of dynamic distance can also change the influence for causing vehicle rolling radius to change to wheel rolling distance, also with modifying factor tire pressure
The influence of wheel rolling distance change caused by can be because of other factors.
Compared with prior art, the invention has the advantages that
1, the absolute comparison method of wheel pulse number of the invention monitors tire pressure technology, can not only be not normal to single wheel tyre pressure
It is monitored early warning, also capable of taking turns tire pressures to 2 wheels, 3 wheels and 4, exception is monitored early warning simultaneously, additionally it is possible to ladder
Four wheels of tire pressure are monitored early warning.
2, the present invention can not only be monitored early warning to the identical vehicle of front and back wheel standard tire pressure, moreover it is possible to front and back wheel
The different vehicle of standard tire pressure is monitored early warning.
3, early warning can not only be monitored to the various abnormal conditions of wheel tyre pressure, identifies anomalous wheel position, Er Qieben
Technological invention makes the process for carrying out self study for various tire technology situations become more simple and direct feasible.
4, can automatically form positive feedback to rapid air leakage of tyre, shorten tire pressure and differentiate the time, be effectively reduced False Rate and
Misdetection rate, while the technology also has the characteristics that at low cost, high reliablity, installation maintenance are simple and convenient.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and embodiments:
Fig. 1 is the structural block diagram of tire pressure monitoring early warning system of the present invention；
Fig. 2 is the flow chart of tire pressure monitoring method for early warning of the present invention.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, With reference to embodiment and join
According to attached drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid this is unnecessarily obscured
The concept of invention.
Embodiment:
Tire pressure monitoring early warning system of the present invention includes the wheel speed sensor being mounted on four wheels of vehicle, receiving area
The wheel pulse number for managing the pulse signal of wheel speed sensor output receives processing unit, and pulse signal is stored in wheel
In umber of pulse operation judgement unit, operation judgement unit can provide a certain amount of information storage function and can be carried out respective rule
Algorithm operation to differentiate whether tire pressure is abnormal, and will differentiate that result information is output to tire pressure display unit or specified letter
It ceases in receiver, such as: CAN system or display screen.
Certain vehicle vehicle is with standard tire pressure P0With a certain stabilizing speed V0Travel certain distance S0, record each wheel standards arteries and veins
Rush numberBeing respectively as follows: the near front wheel isOff-front wheel isLeft rear wheel isOff hind wheel isFour wheel standards umber of pulses
Average value be N0, N0With each wheel standards umber of pulseRatio be
The vehicle is in a certain monitoring time section t, with tire pressure Pi, vehicle velocity V traveling, by wheel actual measurement umber of pulse NiWithMultiply
Product is known as umber of pulse count value, and the minimum value counted in each wheel pulse counting number value from start recording vehicle pulse reaches standard
The average value N of umber of pulse0When until, record each wheel actual measurement umber of pulseBeing respectively as follows: the near front wheel isOff-front wheel is
Left rear wheel isOff hind wheel isN0The revolution of the corresponding wheel rolling of a wheel pulse number not less than 60 turns and should be not higher than
120 turns, make monitoring cycle both will not because monitoring cycle is too short rate of false alarm occur excessively high, will not be dropped because monitoring cycle is too long
Low tire pressure monitoring sensitivity.
Calculate the difference of each wheel actual measurement umber of pulse and corresponding calibration pulse number are as follows:And it is rightIt presses
It sorts, is respectively as follows: from small to largeCorresponding wheel standards umber of pulse is respectively as follows: Corresponding each wheel actual measurement umber of pulse is respectively as follows:Corresponding wheel is respectively as follows: No. 1 wheel, and No. 2
Wheel, No. 3 wheels, No. 4 wheels.
In t monitoring time section, enable: No. 1 wheel is being rotatedAfter a pulse, also need to be rotated further byA pulse, institute
The distance of rolling could be with the distance S of the wheel rolling under standard state0It is equal；To survey umber of pulse for No. 1 wheel
Correction value, revised umber of pulse areWith corresponding calibration pulse numberDifference DELTA1Are as follows:
Due toValue is smaller, at this time it is believed that No. i-th wheel is rotatingAfter a pulse, it is rotated further byA pulse, institute
The distance of the rolling also distance S with lower No. i-th wheel rolling of standard state0It is approximately equal；
Solve the method example one of wheel pulse number correction value:
Since wheel rolling is equidistant, according to the relationship of speed and vehicle wheel roll radius: r=kv(v-v0)+r0And tire pressure
With the relationship of vehicle wheel roll radius: r=kp(p-p0)+r0And the relationship of radius of wheel r, umber of pulse N and rolling distance S: r=
ZS/ (2 π N) can derive No. 1 revised umber of pulse N of wheel1With corresponding calibration pulse numberDifference DELTA1Are as follows:
In formula (1): kvFor speed and radius of wheel variation coefficient, kpFor tire pressure and radius of wheel variation coefficient；k0=N0/
(2r0), rolling radius is r to wheel in normal conditions0, rolling distance S0When corresponding average pulse number be N0；
In formula (1): No. 1 wheel leads to the variable quantity of umber of pulse in t-th of monitoring time section due to speed variationBy
Lead to the variable quantity of umber of pulse in tire pressure variationIt is respectively as follows:
It is obtained by (1) formula:
It according to (4) formula, can derive to any wheel, have for No. 2 wheels:
Because each wheel average linear velocity on same vehicle of same period can be approximately considered identical, then vehicle is monitored in t
Period each wheel changes average value because of the umber of pulse that speed variation generatesAre as follows:
Due toThen have:It might as well enable:Wherein:For in t-th of monitoring
Between section Δ Np1With Δ Np2Variation relation coefficient, and(4) formula and (5) formula simultaneous solution are substituted into, can be obtained:
Similarly, it can obtain:
In above-mentioned (7) (8) formula,The correction value of umber of pulse is respectively surveyed for No. 2 and No. 3 wheels,
That is: No. 2 wheel is rotatingAfter a pulse, also need to be rotated further byA pulse, the distance rolled could be with standard shapes
The distance s of lower No. 2 wheel rollings of state0It is equal；No. 3 wheel is rotatingAfter a pulse, also need to be rotated further byA pulse, 3
The distance that number wheel is rolled could be with the distance s of the wheel rolling under standard state0It is equal；And haveAnd
It can be obtained from above-mentioned analysis:That is: t monitoring
Period, each wheel rotatedIt after a pulse, also needs to be rotated further by the N number of pulse of Δ, the distance ability and standard state rolled
Under each wheel rolling distance s0It is equal；Δ N is the common correction value that umber of pulse is surveyed for each wheel.That is:
And due to:And No. 4 wheel is the most fast wheel of gas leakage, it could even be possible to being
The wheel of tire is pricked,Numerical stability is in descending order are as follows:Therefore three's impact factor point is taken
Not Wei α=0.6, β=0.3, γ=0.1, therefore have
(9) formula is substituted into (4) Shi Ke get:
Similarly, it can be derived by (14) formula to other each wheels, therefore had in conjunction with (10) (11) (12):
By (6) (7) (8) formula and (13) (14) formula simultaneous solution,
It can obtain:
It can similarly derive:
WhenWhen identical as previous monitoring period of time by sequence from small to large, in (18) (19) (20) (21) formula,And as t=1, WhenWhen,
WhenWhen by sequence from small to large with previous monitoring period of time difference, in (18) (19) (20) (21) formula,
When radius of wheel mutation meets self study condition, system carries out self study, re-establishes new each wheel standards
Umber of pulse benchmark；After each self study of system, monitoring period of time ordinal number t restarts to count；
Therefore, according to measured each wheel pulse number, revised each wheel pulse number and respective calibration pulse are obtained
The difference that number absolutely comparesThe umber of pulse changing value that i.e. each wheel pulse number is generated by tire pressure variation, with corresponding high tire
Pressure gate limit ΔHWith low tire pressure threshold value ΔLIt compares, ifAndThen it is determined as that the tire presses through
It is high；IfAndThen determine that the wheel tyre pressure is too low.
When Vehicular turn, according to steering wheel angle size and rotation direction, first the umber of pulse of corresponding wheel is repaired
Just, it can be compared with wheel pulse number when straight-line travelling；
Axle wheel pulse number is mutually corrected when steering, and amendment afterpulse number is actual measurement umber of pulse N and correction factor k
Product；Each wheel pulse number correction factor are as follows:
In (22) formula, kFLFor preceding revolver correction factor, NFLUmber of pulse, k are surveyed for preceding revolverFRIt is corrected for front right wheel and is
Number, NFRUmber of pulse, k are surveyed for front right wheelRLFor rear revolver correction factor, NRLUmber of pulse, k are surveyed for rear revolverRRIt is repaired for rear right wheel
Positive coefficient, NRRUmber of pulse is surveyed for rear right wheel.
When vehicle braking, after receiving brake signal, each vehicle that this system will be counted in automatic rejection braking process
Umber of pulse is taken turns, in order to avoid erroneous judgement tire pressure.
When vehicle slides, after receiving wheel slip signal, this system is by this section of driving process of automatic rejection
Middle counted each wheel pulse number, in order to avoid erroneous judgement tire pressure.
Solve the example two of the method for actual measurement wheel pulse number correction value:
It is solved using fitting process；(6) (7) (8) are substituted into (13) formula, in the common correction value of resulting each wheel pulse number
In Δ N expression formula, it is believed thatTherefore coefficient with different constants can enable:
In (23) formula, α0, α1, α2, α3, α4For constant, 5 kinds of different facts are selected for (23) formula, are mutually taken an entrance examination
It tests, corresponding coefficient can be found out according to test data, fit each common correction value of wheel pulse number.
Solve the example three of the method for actual measurement wheel pulse number correction value:
(6) (7) (8) formula is solved respectively using fitting process first, is found outAfterwards, then (13) formula is substituted into
Find out the common correction value Δ N of each wheel pulse number.
It utilizesWhen solving the common correction value Δ N of each wheel pulse number, it can use
In any two value be fitted solve Δ N.
Tire pressure discriminant information shows example four:
Tire pressure is differentiated that result information couples display on instrument board with vehicle-mounted CAN system, can be shown by LCD screen
The position of abnormal tyre pressure wheel whether can also showing tire pressure normally by single indicator light, and passes through voice prompt alarm；
Tire pressure discriminant information shows example five:
Tire pressure is differentiated that result information is connected with independent display screen, shows the position of abnormal tyre pressure wheel on a display screen
It sets, and shows the high or low degree of tire pressure by the height of the ELD light beam lighted on the screen.
Wheel tyre pressure monitoring and pre-alarming method example six:
Fig. 2 is wheel tyre pressure monitoring and pre-alarming method program circuit, wherein establishs or updates each wheel pulse number benchmark
It is to establish or update each wheel standards umber of pulse for tire technology changed condition for one of the subprogram in this program, with
For the purpose of the benchmark absolutely compared as each wheel pulse number.The variation of wheel technology status includes tire rotation, and tire is more
Newly, the situation that tire maintenance tonifying Qi and four-wheel aligner etc. can be such that vehicle wheel roll radius is mutated,
Calculating umber of pulse correction value is the another subprogram in this program, is to utilize (13) formula or (23) formula or other calculations
Method calculates wheel pulse number correction value, to realize to the amendment of each wheel actual measurement umber of pulse, makes the revised pulse of each wheel
Number can be compared with each wheel standards umber of pulse.
Each wheel is calculated because the umber of pulse changing value that tire pressure variation generates is the another subprogram in this program, is basis
(18) after formula etc. rejects non-tire pressure influence factor, each wheel pulse number and respective calibration pulse number absolutely compared with difference
Differentiate that each wheel tyre pressure state is the another subprogram in this program, is according to continuous 3 or 5 measurement periods
Umber of pulse operationCross high threshold with tire pressure or cross threshold ones comparison result with tire pressure, by small sample diagnostic method or
The too high or too low degree of tire pressure is differentiated by the size of its average value, and determines the need for carrying out abnormal tyre pressure alarm.
It shows that each wheel tyre pressure information is the another subprogram in this program, indicates tire pressure 115% with green LED lamppost
~85% standard tire pressure range, the column of green light highest when tire pressure is standard tire pressure, column of green light, which shortens, indicates that tire pressure changes,
But also in normal operating range；When tire pressure is the 85% of standard tire pressure, column of green light, which shorten to zero, becomes column of red light, red
Light beam is higher, and expression gas leakage is more serious, when tire pressure be standard tire pressure 60% or be lower than 60% when column of red light highest, work as tire pressure
When dropping to the 75% of standard tire pressure, column of red light flashes and light beam height is total high half, when tire pressure drops to standard tire
Pressure 60% when, buzzer is also alarmed ring while column of red light flashing；Orange-yellow lamppost indicates the excessively high degree of tire pressure,
When tire pressure be standard tire pressure 140% or be higher than 140% when, orange-yellow lamppost highest, when tire pressure is increased to standard tire pressure
When 125%, orange-yellow light beam flashes and light beam height is total high half, when tire pressure is increased to the 140% of standard tire pressure,
Buzzer is also alarmed ring while orange-yellow light beam flashes.
It should be understood that above-mentioned specific embodiment of the invention is used only for exemplary illustration or explains of the invention
Principle, but not to limit the present invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.In addition, appended claims purport of the present invention
Covering the whole variations fallen into attached claim scope and boundary or this range and the equivalent form on boundary and is repairing
Change example.
Claims (10)
1. a kind of tire pressure monitoring early warning system based on the absolute comparison method of wheel pulse number characterized by comprising
One vehicle wheel rotation umber of pulse monitoring unit, for generating, receiving each vehicle wheel rotation umber of pulse information；
One wheel pulse number operation judgement unit, for travelling each of certain distance acquisition according in standard tire pressure with certain speed
Wheel pulse number information establishes each wheel standards umber of pulseAs benchmark, the flat of four wheel standards umber of pulses is sought respectively
Mean value N0With each wheel standards umber of pulseThe ratio betweenEach monitoring cycle of wheel pulse number surveys umber of pulse with each wheel
NiWithProduct in minimum value reach the average value N of calibration pulse number0Until；By each wheel actual measurement umber of pulse amendment after with
Respective wheel standards umber of pulse is compared, and differentiates whether tire pressure is abnormal, by revised each wheel pulse number and respective standard
The difference that umber of pulse absolutely comparesWith corresponding high tire pressure threshold value ΔHWith low tire pressure threshold value ΔLIt compares, ifAndThen it is determined as that the tire presses through height；IfAndThen determine the wheel
Tire pressure is too low；And it is sent to tire pressure display unit and differentiates result information；
The wheel pulse number operation judgement unit includes wheel pulse number amending unit, ask each wheel actual measurement umber of pulse with it is corresponding
Calibration pulse number difference Δ NiAnd to difference DELTA NiIt sorts by size, each wheel actual measurement umber of pulse is modified, to wheel
Umber of pulse correction valueIt is fitted to about Δ NiFunction f (Δ Ni), wheel rolling distance corresponding to revised umber of pulse
It is equidistant with wheel rolling corresponding to calibration pulse number or approximately equal.
2. the tire pressure monitoring early warning system according to claim 1 based on the absolute comparison method of wheel pulse number, feature exist
In the wheel pulse number operation judgement unit includes:
Calibration pulse base standard establishes unit, and the calibration pulse base for establishing each wheel is quasi-, the actual measurement umber of pulse for each wheel
It is compared with respective calibration pulse number；
Tire pressure condition discrimination alarm unit differentiates tire pressure by comparing the difference of each wheel corrected impulse number and calibration pulse number
The position of Status Level and abnormal tyre pressure wheel sends wheel pulse number to tire pressure display unit and differentiates result information.
3. the tire pressure monitoring early warning system according to claim 2 based on the absolute comparison method of wheel pulse number, feature exist
In the wheel pulse number operation judgement unit further includes self study unit, for carrying out certainly when vehicle wheel roll radius mutation
Study, updates each wheel standards umber of pulse benchmark.
4. the tire pressure monitoring early warning system according to claim 2 based on the absolute comparison method of wheel pulse number, feature exist
In when Vehicular turn, the wheel pulse number amending unit mutually corrects axle wheel pulse number when turning to, and corrects
Afterpulse number is the product for surveying umber of pulse and correction factor.
5. the tire pressure monitoring early warning system according to claim 2 based on the absolute comparison method of wheel pulse number, feature exist
In after receiving vehicle brake signal perhaps wheel slip signal in rejecting braking process or during vehicle slip
Each wheel pulse number of statistics.
6. the tire pressure monitoring early warning system according to claim 1-5 based on the absolute comparison method of wheel pulse number,
It is characterized in that, the tire pressure display unit is the instrument board coupled with vehicle-mounted CAN system or separate display screens, display
The position of abnormal tyre pressure wheel and tire pressure high and low level.
7. a kind of tire pressure monitoring method for early warning based on the absolute comparison method of wheel pulse number, which comprises the following steps:
S01: with certain speed traveling certain distance and the umber of pulse of vehicle wheel rotation is recorded as the standard of the wheel in standard tire pressure
Umber of pulse
S02: the average value N of four wheel standards umber of pulses is sought respectively0With each wheel standards umber of pulseThe ratio betweenWheel arteries and veins
It rushes each monitoring cycle of number and umber of pulse N is surveyed with each wheeliWithProduct in minimum value reach the flat of calibration pulse number
Mean value N0Until；
S03: the difference Δ N of each wheel actual measurement umber of pulse and corresponding calibration pulse number is soughtiAnd to difference DELTA NiIt sorts by size,
Each wheel actual measurement umber of pulse is modified, to wheel pulse number correction valueIt is fitted to about Δ NiFunction f (Δ Ni),
Wheel rolling distance corresponding to revised umber of pulse is equidistant or approximate with wheel rolling corresponding to calibration pulse number
It is equal；
S04: by revised each wheel pulse number and respective calibration pulse number absolutely compared with differenceWith corresponding high tire
Pressure gate limit ΔHWith low tire pressure threshold value ΔLIt compares, ifAndThen it is determined as that the tire presses through
It is high；IfAndThen determine that the wheel tyre pressure is too low.
8. the tire pressure monitoring method for early warning according to claim 7 based on the absolute comparison method of wheel pulse number, feature exist
In in the step S01, when vehicle wheel roll radius mutation, progress self study updates each wheel standards umber of pulse benchmark.
9. the tire pressure monitoring method for early warning according to claim 7 based on the absolute comparison method of wheel pulse number, feature exist
In, in the step S02, function f (Δ Ni) solved jointly by approximate solution by iterative method or using fitting process and iterative method.
10. the tire pressure monitoring method for early warning according to claim 7 based on the absolute comparison method of wheel pulse number, feature exist
In, further include tire pressure show step:
Indicate tire pressure in 115%~85% standard tire pressure range, the green light when tire pressure is standard tire pressure using green LED lamppost
Column highest, column of green light, which shortens, indicates that tire pressure changes, but also in normal operating range；
When tire pressure is the 85% of standard tire pressure, column of green light, which shorten to zero, becomes column of red light, the higher expression gas leakage of column of red light
More serious, when tire pressure drops to the 60% of standard tire pressure, buzzer is also alarmed ring while column of red light flashing；
Indicate that the excessively high degree of tire pressure becomes orange-yellow when tire pressure is increased to the 115% of standard tire pressure using orange-yellow lamppost
Light beam, when tire pressure is increased to the 140% of standard tire pressure, buzzer is also alarmed ring while the flashing of orange-yellow light beam.
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| CN106934463A (en) * | 2017-03-03 | 2017-07-07 | 燕山大学 | A kind of self-learning method for indirect type tire pressure monitoring system Intelligent Calibration |
| CN107571690B (en) * | 2017-09-01 | 2018-08-03 | 中睿宏智汽车技术（深圳）有限公司 | A kind of tire condition monitoring method and device based on learning-oriented polynary perception |
| CN108177487B (en) * | 2017-12-27 | 2020-06-26 | 清华大学苏州汽车研究院（吴江） | Tire air pressure monitoring method and device |
| CN110654187B (en) * | 2019-09-29 | 2020-10-02 | 清华大学 | Tire pressure monitoring method and device based on wheel speed |
| CN115570916A (en) * | 2021-06-21 | 2023-01-06 | 比亚迪股份有限公司 | Tire underpressure identification method and device, storage medium and vehicle control unit |
| CN114475100A (en) * | 2022-02-15 | 2022-05-13 | 深圳市星卡软件技术开发有限公司 | Remote fault diagnosis method and device for tire pressure sensor and computer equipment |
| CN115366589A (en) * | 2022-09-22 | 2022-11-22 | 台铃科技股份有限公司 | Method and device for measuring tire pressure through pulse number and electric vehicle |
| CN115503401A (en) * | 2022-10-17 | 2022-12-23 | 元动新能源汽车有限公司 | New energy vehicle tire pressure indirect detection method |
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