CN101961972A - Automobile tire pressure detection method - Google Patents
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- CN101961972A CN101961972A CN2010102645493A CN201010264549A CN101961972A CN 101961972 A CN101961972 A CN 101961972A CN 2010102645493 A CN2010102645493 A CN 2010102645493A CN 201010264549 A CN201010264549 A CN 201010264549A CN 101961972 A CN101961972 A CN 101961972A
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Abstract
The invention relates to the technical field of automobile tire pressure detection, in particular to a method for judging the change of automobile tire pressure by calculating and contrastively analyzing the rotation speeds of automobile tires so as to learn about the automobile tire pressure and prevent the occurrence of accidents. The technical scheme comprises the traditional steps: establishing a set of rotation speed data by sampling, measuring or calculating the rotation speed of each tire in the advancing process of each automobile tire, comparing with a rotation speed energy-saving model of each tire acquired in real time according to the established data, and thus measuring and calculating the pressure condition of each tire. The improvement of the invention is as follows: a reference value R is introduced, values for judging tire pressure need to be screened by R, and the acquired data should be also screened by R, thereby enabling the warning on tire pressure to be more accurate.
Description
Technical field:
The present invention relates to air pressure of automobile tire detection technique field, be meant especially by calculating the method that the air pressure of automobile tire situation of change is judged in motor tire rotating speed and comparative analysis, with timely understanding air pressure of automobile tire, accident beyond preventing.
Background technology:
Vaporization is in the process of form, if the vaporization tire flat, chaufeur has not only been wasted fuel if can not connect the gas leakage situation of motor tire in real time in enforcement, the hidden danger of accident beyond also existing.Therefore to understand the barometric information of motor tire in real time be very necessary to chaufeur, also is crucial.
The technical scheme that air pressure of automobile tire is detected mainly is by loading pressure sensor tire pressure to be detected in real time at present, and carries out leakage alarm according to measured numerical values recited.But this technical scheme exists under the friction speed, occurs the defective of flase alarm easily.
In addition, the technical scheme of tire pressure being judged by tire rotational speed is also arranged, and this scheme is by obtaining the tire rotational speed data, and all kinds of tire rotational speed data are calculated, there are result of calculation and the numerical value of presetting to compare, thereby draw the situation of each tire pressure of automobile.But also there is defective in this tire pressure measurement technique scheme, it only the air pressure deficiency occurs to single tire is to report to the police, when all there is the situation of air pressure deficiency in two or more tires be, this technical scheme then can't be reported to the police to the air pressure deficiency, and promptly there is certain deficiency in this technical scheme.For example: under the motoring condition, in speed per hour is under the situation of V, automobile is left front, right front, left back, the rotating speed of right rear fire is respectively V1, V2, V3, V4, when the air pressure of the some tires of automobile is not enough, suppose the air pressure deficiency of left front tire, then in the actual travel process, the rotating speed V1 of left front tire is greater than right front fire rotating speed V2, and the difference between V1, the V2 has surpassed the default amount of deflection, and the air pressure that so just can detect when the automobile left front tire occurs not enough.But when air pressure deficiency situation all appearred in left front, right front fire, the difference that then may occur between V1, the V2 still was in the default deviation range, then just can't detect the situation that the air pressure deficiency appears in motor tire this moment, and this driver brings potential safety hazard.
At above-mentioned situation, the present invention once proposed a kind of later-model technical scheme, see that Chinese patent application number is: 200810218584.4 Chinese invention patent prospectus, it discloses a kind of " monitoring method that air pressure of automobile tire changes and realize the decorum of this monitoring method ".This technical scheme is: carry out the tire rotational speed sampling according to an automobile tire in traveling process, a cover rotary speed data is set up in measurement or calculating, again according to data of being set up and the energy-saving comparison of each tire rotational speed of obtaining in real time, thereby the barometric information of measuring and calculating place tire, and can measuring and calculating place two or more tire the situation of air pressure when not enough appears simultaneously, and show the particular location of these two or more tires.Why this technical scheme can overcome the deficiencies in the prior art, because it is not the rotating speed that directly contrasts each tire, but comparing to the diverse location tire rotational speed with value, so just can avoid when all there is the situation of air pressure deficiency in two or more tires the situation that the prior art scheme then can't be reported to the police to the air pressure deficiency.
In addition, the inventor finds in to actual use, also there is certain deficiency in above-mentioned technical scheme, for example, when automobile is being turned big or four-wheel speed can't keep balance the time, the data that detect this moment just might produce wrong judgement to monitoring result, and this driver brings unnecessary trouble.To this, the inventor proposes following technical scheme, to overcome the deficiencies in the prior art.
Summary of the invention:
Technical matters to be solved by this invention is exactly the deficiency that exists in the present technical scheme in order to overcome, and proposes a kind of testing result air pressure of automobile tire method of inspection more accurately.
For solving the problems of the technologies described above, the present invention has adopted following technical scheme: this method comprises the steps: (1), obtains reference value R, gather the data of automobile four tire speed of some groups of automobile speed per hours in 50-90 kilometer velocity shooting, and bring the speed data of four tires in every group of data into following formula and calculate: R=(FL+BL)-(FR+BR), wherein FL is that the near front wheel speed, BL are that off hind wheel speed, FR are that off front wheel speed, BR are off hind wheel speed; (2), the aviation value R1 of resulting some R values in the calculation procedure (1); (3), repeating step (1) obtains another data R2, if the numerical value of R1, R2 is in default deviation range, then with R1, R2 aviation value as with reference to value R; If the numerical value of R1 or R2 has surpassed default deviation range, then repeating step (1) obtains new aviation value; If repeat repeatedly still can't to obtain the R numerical value in default deviation range, then the aviation value of the data that will repeatedly obtain is as with reference to value R; The reference value R that is obtained determines a deviation range, and the data in deviation range are valid data; (4), obtain judgment value D, gather the data that have automobile four tire speed of some groups of automobile speed per hours in 50-90 kilometer velocity shooting that obtain after the reference value R screening of imitating in the data area through above-mentioned, and bring the speed data of four tires in every group of data into following formula and calculate: D=(FL+BR)-(FR+BL); (5), the aviation value D1 of resulting some D values in the calculation procedure (4); (6), repeating step (4) obtains other several data Dn, if the numerical value of D1, Dn is in default deviation range, then with D1, Dn aviation value as with reference to value D; If the numerical value of D1 or Dn has surpassed default deviation range, then repeating step (4) obtains new aviation value; If repeat repeatedly still can't to obtain the D numerical value in default deviation range, then the aviation value of the data that will repeatedly obtain is as with reference to value D; (7), begin to judge whether vehicle tire pressure normal, implement to gather the data of four tire speed of some groups of automobiles, and bring the speed data of four tires in every group of data into following formula and calculate: D '=(FL+BR)-(FR+BL); (9), determine the speed of a motor vehicle section at the D ' place calculated, with respectively with step (6) in judgment value D in the friction speed section compare, if the difference between the cooresponding with it D of multi-group data D ' has surpassed preset value, then report to the police.
In the technique scheme, the judgment value D that step (6) obtains deduct a correction as the automobile speed per hour less than the judgment value D in 50 kilometers velocity shootings; With the judgment value D that obtains add a correction as the automobile speed per hour greater than the judgment value D in 90 kilometers velocity shootings;
In the technique scheme, in the step (1), when obtaining reference value R, the above data of at least 4 group data have been gathered altogether.
In the technique scheme, the default deviation range of R numerical value is 0.42 meter per second in the step (3); The deviation range of the valid data of R reference value is | the 0.28| meter per second.
In the technique scheme, the number of times of repeated acquisition data be at least 6 times in the step (3), if repeat the R numerical value that still can't obtain in default deviation range at least 6 times, then with the aviation value of the data that obtain as with reference to being worth R.
In the technique scheme, the default deviation range of D numerical value is 0.042 meter per second in the step (6); The number of times of repeated acquisition data is 6 times at least, if repeat the D numerical value that still can't obtain in default deviation range at least 6 times, then with the aviation value of the data that obtain as with reference to value D.
In the technique scheme, described judgment value D deduct a correction as the automobile speed per hour less than the judgment value D in 50 kilometers velocity shootings; Judgment value D add a correction as the automobile speed per hour greater than the judgment value D in 90 kilometers velocity shootings, it is 0.056 meter per second that described judgment value D deducts correction; The correction that judgment value D adds is 0.197 meter per second.
After the present invention adopts technique scheme, the technical program remains according to an automobile tire carries out the tire rotational speed sampling in traveling process, a cover rotary speed data is set up in measurement or calculating, again according to the data of being set up and the energy-saving comparison of each tire rotational speed of obtaining in real time, thus the barometric information of measuring and calculating place tire.But the present invention is that the present invention has introduced a reference value R at the beginning of improving, and the numerical value that tire pressure is judged is to need to screen through R, by R the data of gathering is screened, and is more accurate to the warning of tire pressure like this.
In addition, the present invention distinguishes the different speed of a motor vehicle, and it is more accurate that tire pressure is reported to the police, and avoids occurring the mistake alarm.Acquisition process to the judgment value D that judges air pressure improves, and has shortened its acquisition time, has improved the precision of obtaining simultaneously.
Description of drawings:
Fig. 1 is the diagram of circuit that reference value R obtains among the present invention;
Fig. 2 is the diagram of circuit that judgment value D obtains among the present invention;
Fig. 3 is the implementation method diagram of circuit of the specific embodiment of the invention;
Fig. 4 is the diagram of circuit of test subroutine among Fig. 3;
Fig. 5 is the circuit diagram of specific embodiment of the invention testing circuit;
Fig. 6 is a tire vehicle speed measurement circuit diagram in the specific embodiment of the invention.
The specific embodiment:
The present invention is to needing to quote two numerical value: reference value R and judgment value D in the air pressure of automobile tire method of inspection.Wherein judgment value D needs just can obtain after the process reference value R screening, and promptly all judgment value D are the judgements through R.
The effect of reference value R: reference value R is after gathering N four-wheel signal, brings the result of computing formula R=(FL+BL)-(FR+BR) obtain into, and wherein FL is that the near front wheel speed, BL are that off hind wheel speed, FR are that off front wheel speed, BR are off hind wheel speed.Can can't keep equilibrium criterion to remove than big or four-wheel speed by reference value R, the alarm that the present invention can not be made a mistake when judging tire pressure automobile turning.
For obtain reference value R accurately, Cai R image data when the second district velocity shooting only in acquisition process.The present invention is divided into three velocity shootings to the speed of a motor vehicle, wherein:
First district's velocity shooting speed of a motor vehicle is less than 50 kilometers/hour
Second district's velocity shooting speed of a motor vehicle is 50-90 kilometer/hour
The 3rd district's velocity shooting speed of a motor vehicle is greater than in 90 kilometers/hour
Referring to Fig. 1, below be the flow process of obtaining of reference value R, also be called the learning process of R value:
1, gather the data of 15 groups of N pulses in speed per hour 50-90 kilometer velocity shooting, ask average conduct with reference to value R, the numerical value of N can be arbitrary data, but usually in order to ensure the particularity of fetched data, N is at least 4, and N is 15 in the present embodiment;
2, in gatherer process, 15 groups of R1 that data computation obtains that gather the first time, its velocity deviation is less than 0.042m/s, and this 0.042m/s is the default deviation range that obtains according to experimental calculation.If the numerical value of R1 is gathered 15 groups of data once more, and is calculated the R2 of aviation value in default deviation range.If the numerical value of R2 also in default deviation range, then calculates the aviation value of R1 and R2, and this aviation value is worth R as reference.If R2 greater than 0.042m/s, then collect once more data when with the default deviation range in front relatively, if its numerical value can calculate reference value R with R1 during less than 0.042m/s.But,, average as with reference to being worth R 6 groups of data so if gathered 6 groups all not in default deviation range.
3, after reference value R determines, be valid data in the scope of ± 0.28m/s, surpassing is invalid data.The deviation range that is the valid data of R reference value is | the 0.28| meter per second.
When follow-up definite judgment value D, the N that gathers data just can add up and judge D value after being judged as valid data through R, promptly all data of D value all will be passed through the judgement of R.
Above-mentioned said reference value R, as follows in the R of perfect condition value deviation
Overgauge R=0.28m/s---------------------------------------
Center line R=0-----------------------------------------------
Minus deviation R=-0.28m/s--------------------------------------
At desirable status circuit in when operation because 4 to take turns the signal input all identical all the time, thereby R=((FL+BL)-(FR+BR))=0, getting R=± 0.28m/s when reference value is got by system in this state is valid data.
And in the reality system operational process because the difference of external conditions, may under optimal condition, the R reference value also can't equal 0, for example, in real process, R=((FL+BL)-(FR+BR))=0.07m/s, the four-wheel signal of operational process input also is the right and left fluctuation at 0.07m/s all the time, rather than in 0 value both sides fluctuation.Thereby the reference value of R is actually system's actual center line in when operation.When program is got the valid data of N pulse, to be valid data with R=0.07m/s ± 0.28m/s! As follows, dotted line is actual center line reference value R=0.056m/s, and it is to be only effective numerical value at the numerical value between two dotted lines up and down that actual span after the reference value is arranged.
Existing condition R value deviation
Overgauge R=0.28m/s
Actual overgauge R=0.351m/s
Center line R=0
Actual center line R=0.056m/s
Minus deviation R=-0.28m/s
Actual negative deviation R=-0.169m/s
Next, need obtain judgment value D, the effect of judgment value D is to judge whether tire pressure is normal, and it is four-wheel signal valid data of gathering 15 groups of N pulses that screening obtains through the R value, calculates the back gained by formula: D=(FL+BR)-(FR+BL).Promptly when obtaining judgment value D, need to gather the four-wheel signal data of 15 groups of N pulses equally, but this write data must be through the judgement of R value.At first calculate the corresponding reference value R ' of these image data, this reference value and the R value obtained are previously compared, if R ' is in effective number range of above-mentioned R value, then the data of being gathered are effective.So obtain 15 groups of data and carry out calculating judgment value D.
The D value is only travelled the data collected just for effectively when the speed per hour 50-90 in second district kilometer in learning process, when having learnt the D value, the second district's judgment value that is obtained is deducted the judgment value of 0.056m/s as first district, second district's judgment value is added the judgment value of 0.197m/s as the 3rd district.When carrying out tire pressure when judging, follow the 15*N that collects an in real time pulse data D judgment value to compare, whether unusual its result as tire pressure foundation.
Referring to Fig. 2, below be the acquisition process of judgment value D, also be called the learning process of D value.
1, gather instantaneous four-wheel signal data, every group of data through reference value R relatively after, filter out active data, generally gather 15 groups of valid data.
2, with 15 groups of whole additions of data, bring formula then into and calculate, formula: D=(FL+BR)-(FR+BL) calculates the back gained.
3, determine the speed subregion at D place, obtain four groups of data of this subregion, and calculate its aviation value D
AVE
4, obtain one group of data at every turn just catch up with once and compare, if the result less than 0.042m/s just the aviation value of these two numerical value as reference value.
If 5 have relatively all failed the result for 5 times, so 6 data are averaged as the judgment value of D.
After obtaining judgment value D, just can whether normally judge the tire pressure of automobile.Its deterministic process is as follows:
Gather the data of four tire speed of 15 groups of automobiles in real time, and bring the speed data of four tires in every group of data into following formula and calculate: D '=(FL+BR)-(FR+BL); Determine the speed of a motor vehicle section at the D ' place calculated, then respectively with the above-mentioned friction speed section of obtaining in judgment value D compare, if the difference between the cooresponding with it D of multi-group data D ' has surpassed preset value, then report to the police.For example, the difference between the cooresponding with it D of D ' has surpassed preset value 0.037m/s, and then counting machine adds 1, when judging continuous three times during greater than 0.037m/s, carries out pre-alarm, reminds chaufeur to note.Then report to the police all greater than 0.075m/s if comparative result is double, the air pressure of automobile tire mal is described.
Above-mentioned judgment value D may maintain in the deviate scope during by D=(FL+BR)-(FR+BL) computing under normal condition all the time, reference value is exactly to get an aviation value to the D value of place subregion, and in fact this aviation value is exactly the medium line of D value distribution limit, the D value is to equal 0 all the time under perfect condition, and that actual conditions are system works is normal all the time, but because still there is deviation in each road signal just often, make the result of computing D in the scope of certain value, fluctuate, rather than in 0 scope, fluctuate, and establishment Min of reference value is a center line of determining D.And occur the more situation of this reference value to occur departing from when intentional when a certain road signal.
The D deviation of perfect condition
Overgauge D=0.075m/s-------------------------------------------
Overgauge D=0.037m/s---------------------------------------------
Center line D=0-------------------------------------------------
Minus deviation D=-0.037m/s--------------------------------------------
Minus deviation=-0.075m/s--------------------------------------------
The D deviation of existing condition
Overgauge D=0.075m/s
Warning overgauge D=0.084m/s
Overgauge D=0.037m/s
Warning overgauge D=0.047m/s
Center line D=0
Actual center line D=0.009m/s
Minus deviation D=-0.037m/s
Pre-alarm minus deviation D=-0.028m/s
Minus deviation=-0.075m/s
Warning minus deviation D=-0.056m/s
See Fig. 3,5,6, this is a specific embodiment of the present invention, and its trace routine is as follows:
Press beginning, trace routine brings into operation, program initialization.Press cooresponding learning key, if the key response time surpasses 0.5 second, then enter the detection subprogram, if the time does not surpass 0.5 second, then buzzer phone was rung 0.5 second, and indicator lamp is green, orange, red takes turns sudden strain of a muscle once.Next, the cooresponding green light of study mark is bright, and the cooresponding orange lamp of precaution alarm mark is bright, buzzer phone ring 5 seconds, and the cooresponding red light of warning label is bright, buzzer phone ring 10 seconds.
Next, data are carried out initialization, gather cooresponding data, obtain reference value R.
Next, gather cooresponding data, obtain judgment value D.
Next, gather real-time tire data, and contrast, judge whether,, then enter next step if occur three times 0.037 meter per seconds continuously greater than 0.037 meter per second with above-mentioned judgment value D.
If occur twice continuously greater than 0.075 meter per second, then change alarm condition over to, the cooresponding red light of warning label is bright.If not, double greater than 0.075 meter per second, then change pre-alarm state over to, the cooresponding orange lamp of pre-alarm mark is bright.If once greater than 0.075 meter per second,, then carry out pre-alarm equally once less than 0.075 meter per second.
In the said procedure, added one and detected subprogram, seen shown in Figure 4ly, it is a judgement judging whether automobile has brought into operation.
See Fig. 5,6, the circuit of present embodiment is connected with the direct supply of automobile by power end POWER, through exporting after filtering, the voltage stabilizing.Wherein be provided with F1 in this power circuit and can recover wire fuse and diode D1, D2 with protective circuit.
Comprise electrification reset, power-off reset circuit in the central process unit chip U1 in this circuit, its inside has EPROM (can rewrite memory device), is used for store data, even circuit does not have electricity, institute's canned data can not lost yet.This testing circuit is connected with metering circuit among Fig. 6 by interface, after the speed of four tires that will detect respectively in the metering circuit is amplified through amplifier U5A, U5B, U5C, U5D respectively, again by behind U6A, U6B, U6C, the U6D filter shape, become impulse singla FL, FR, BL, BR are input to testing circuit and are used for detecting, judging.
Certainly, the above only is example of the present invention, is not to limit the scope of the present invention, and all equivalences of doing according to the described structure of the present patent application claim, feature and principle change or modify, and all should be included in the present patent application claim.
Claims (7)
1. air pressure of automobile tire method of inspection, it is characterized in that: this method comprises the steps:
(1), obtains reference value R, gather the data of automobile four tire speed of some groups of automobile speed per hours in 50-90 kilometer velocity shooting, and bring the speed data of four tires in every group of data into following formula and calculate: R=(FL+BL)-(FR+BR), wherein FL is that the near front wheel speed, BL are that left rear wheel speed, FR are that off front wheel speed, BR are off hind wheel speed;
(2), the aviation value R1 of resulting some R values in the calculation procedure (1);
(3), repeating step (1) obtains another data R2, if the numerical value of R1, R2 is in default deviation range, then with the straight as a reference R of R1, R2 aviation value; If the numerical value of R1 or R2 has surpassed default deviation range, then repeating step (1) obtains new aviation value; If repeat repeatedly still can't to obtain the R numerical value in default deviation range, then the aviation value of the data that will repeatedly obtain is as with reference to value R; The reference value R that is obtained determines a deviation range, and the data in deviation range are valid data;
(4), obtain judgment value D, gather data through four tire speed of automobile of some groups of automobile speed per hours in 50-90 kilometer velocity shooting that obtain after the above-mentioned reference value R screening that has in the valid data scope, and bring the speed data of four tires in every group of data into following formula and calculate: D=(FL+BR)-(FR+BL), wherein FL is that the near front wheel speed, BL are that left rear wheel speed, FR are that off front wheel speed, BR are off hind wheel speed;
(5), the aviation value D1 of resulting some D values in the calculation procedure (4);
(6), repeating step (4) obtains other several data Dn, if the numerical value of D1, Dn is in default deviation range, then with D1, Dn aviation value as judgment value D; If the numerical value of D1 or Dn has surpassed default deviation range, then repeating step (4) obtains new aviation value; If repeat repeatedly still can't to obtain the D numerical value in default deviation range, then the aviation value of the data that will repeatedly obtain is as judgment value D;
(7), begin to judge whether vehicle tire pressure normal, gather the data of four tire speed of some groups of automobiles in real time, and bring the speed data of four tires in every group of data into following formula and calculate: D '=
(FL+BR)-(FR+BL)；
(8), determine the speed of a motor vehicle section at the D ' place calculated, with respectively with step (6) in judgment value D in the friction speed section compare, if the difference between the cooresponding with it D of multi-group data D ' has surpassed preset value, then report to the police.
2. air pressure of automobile tire method of inspection according to claim 1 is characterized in that: step
(6) obtain judgment value D after, the judgment value D that obtains must be deducted a correction as the automobile speed per hour less than the judgment value D in 50 kilometers velocity shootings; With the judgment value D that obtains add a correction as the automobile speed per hour greater than the judgment value D in 90 kilometers velocity shootings.
3. air pressure of automobile tire method of inspection according to claim 1 is characterized in that: in the step (1), when obtaining reference value R, gathered the above data of at least 4 group data altogether.
4. air pressure of automobile tire method of inspection according to claim 1 is characterized in that: the default deviation range of R numerical value is 0.42 meter per second in the step (3); The deviation range of the valid data of R reference value is | the 0.28| meter per second.
5. air pressure of automobile tire method of inspection according to claim 1, it is characterized in that: the number of times of repeated acquisition data is 6 times at least in the step (3), if repeat still can't to obtain at least 6 times the R numerical value in default deviation range, then with the aviation value of the data that obtain as with reference to value R.
6. air pressure of automobile tire method of inspection according to claim 1 is characterized in that: the default deviation range of D numerical value is 0.042 meter per second in the step (6); The number of times of repeated acquisition data is 6 times at least, if repeat the D numerical value that still can't obtain in default deviation range at least 6 times, then with the aviation value of the data that obtain as with reference to value D.
7. air pressure of automobile tire method of inspection according to claim 2 is characterized in that: described judgment value D deduct a correction as the automobile speed per hour less than the judgment value D in 50 kilometers velocity shootings; Judgment value D add a correction as the automobile speed per hour greater than the judgment value D in 90 kilometers velocity shootings; It is 0.056 meter per second that described judgment value D deducts correction; The correction that judgment value D adds is 0.197 meter per second.
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| CN201010264549.3A CN101961972B (en) | 2010-08-26 | 2010-08-26 | Automobile tire pressure detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110840430A (en) * | 2018-08-21 | 2020-02-28 | 北京万生人和科技有限公司 | Intra-abdominal pressure data screening method, computer-readable storage medium, and intra-abdominal pressure data screening device |
| CN115615181A (en) * | 2022-09-30 | 2023-01-17 | 广东利元亨智能装备股份有限公司 | Moisture detection method and baking device |
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| CN110840430A (en) * | 2018-08-21 | 2020-02-28 | 北京万生人和科技有限公司 | Intra-abdominal pressure data screening method, computer-readable storage medium, and intra-abdominal pressure data screening device |
| CN110840430B (en) * | 2018-08-21 | 2022-09-13 | 北京万生人和科技有限公司 | Intra-abdominal pressure data screening method, computer-readable storage medium, and intra-abdominal pressure data screening device |
| CN115615181A (en) * | 2022-09-30 | 2023-01-17 | 广东利元亨智能装备股份有限公司 | Moisture detection method and baking device |
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