CN100425967C - Method for monitoring air pressure variation of automobile tyre and system for realizing the method - Google Patents
Method for monitoring air pressure variation of automobile tyre and system for realizing the method Download PDFInfo
- Publication number
- CN100425967C CN100425967C CNB2005100367280A CN200510036728A CN100425967C CN 100425967 C CN100425967 C CN 100425967C CN B2005100367280 A CNB2005100367280 A CN B2005100367280A CN 200510036728 A CN200510036728 A CN 200510036728A CN 100425967 C CN100425967 C CN 100425967C
- Authority
- CN
- China
- Prior art keywords
- rotating speed
- real
- benchmark
- learn
- difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The present invention discloses a method and a system, which uses the rotating speed of each tyre of the measured vehicle as a reference value and uses the reference values to compare with the rotating speed measured in real time of each tyre to monitor tyre pressure change, and simultaneously, the present invention can be used as a basis to judge the position of the error tyre. Compared with the prior art, the present invention is characterized in that the system accurately judges the error position, and overcomes the problem of difficulty in making an exact position return for the error position judging effect because of different tyre standards, air pressure and attrition rates. In addition, the present invention also overcomes the problems of alarm when the same axle or diagonal position tyre has simultaneous equivalent subpressure and rotating speed and error record to distinguish responsibility.
Description
Technical field
The present invention relates to a kind of utilization and measure the rotating speed that calculates wheel, and, judge the detection method of tire pressure variation and the improvement of system by compare of analysis.
Prior art
Chinese invention patent application CN1623809A discloses a kind of monitoring method of air pressure of automobile tire variation and has realized the system of this method.In this method and system, for enabling each time, such as new car bring into use or re-type after begin to reuse, must detect several wheels, set up new reference point, as detect the foundation of judging the tire ultra under-pressure in the future.The problem that exists is in method and system, for the differentiation of fault tire location, only according to the size of real-time rotating speed, can only be adapted to very limited situation, i.e. the equal-sized situation of homonymy tire reference point.In actual applications because the tire of same type has different specifications, and each tire pressure not finish unanimity, the degree of wear also different, cause their rotating speed reference point differences separately.Therefore, under most of situations, can occur judging inaccurate and problem that cause position message to be made mistakes.In addition, original method and system is for two tires at coaxial or diagonal angle, when occurring the under-voltage situation of equivalent simultaneously, can not carry out prediction and alarm, there is hidden danger in method and system, under extreme situation,, cause the generation of mishap easily owing to do not give a warning.Moreover the data of above-mentioned warning and real-time rotating speed are all very important, record when can be used as the mishap generation and the foundation of distinguishing each side's responsibility, and existing method and system does not carry out record to these data.
Content of the present invention
The objective of the invention is to provide monitoring method that a kind of air pressure of automobile tire changes and the system that realizes the method, this method and system can adapt to all kinds vehicle, under various situations, when tire occurs when under-voltage, can accurately judge the position of tire.
Secondly, the system of the method that the present invention also aims to provide and realization the method for two tires at coaxial or diagonal angle, the under-voltage situation of equivalent occurs when simultaneously, can carry out prediction and alarm equally.
Moreover the system of the method that the present invention also aims to provide and realization the method when reporting to the police, can carry out record to the situation of warning and the rotating speed of each tire.
Its purpose is finished by following scheme:
The monitoring method that a kind of air pressure of automobile tire changes comprises the following steps:
(1), obtains, calculates the rotating speed of each tire of automobile, the rotating speed reference point of Pan Duaning as a comparison;
(2), obtain, calculate the rotating speed of current each tire of automobile, calculate:
The rotating speed benchmark=| (it is right back to learn left front+)-(it is left back to learn right front+) |,
The survey metering rotating speed=| (real left front+real right back)-(real right front+real left back) |,
And comparison rotating speed benchmark and the size of surveying metering rotating speed, result as a comparison;
(3), above-mentioned comparative result is judged,, then report to the police if comparative result surpasses default value, otherwise, turn to step (2);
(4), calculate:
Rotating speed left side difference benchmark=is left front-learn left back, the right poor benchmark of rotating speed=is right front-right back,
Survey meter left side difference rotating speed=reality left front-real left back, survey the right difference of meter rotating speed=reality right front-right back in fact,
Relatively | rotating speed left side difference benchmark-surveys meter left side difference rotating speed | with | the right difference of the rotating speed benchmark-poor rotating speed in surveys meter right side | size:
If | rotating speed left side difference benchmark-survey meter left side difference rotating speed |＞| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |, then relatively judge and survey meter left side difference rotating speed＞rotating speed left side difference benchmark? if, then show the near front wheel fault, otherwise, the left rear wheel fault shown;
If | rotating speed left side difference benchmark-survey meter left side difference rotating speed |＜| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |, then relatively judge and survey the right difference of the meter rotating speed＞right difference of rotating speed benchmark? if, then show the off-front wheel fault, otherwise, the off hind wheel fault shown.
(5), turn to step (2).
Wherein, described left front, learn left back, learn right front, learn right back rotating speed reference point when referring to respectively that the near front wheel, left rear wheel, off-front wheel, off hind wheel are learnt at the beginning; Left front in fact, real left back, real right front, the real right back current actual speed that refers to the near front wheel, left rear wheel, off-front wheel, off hind wheel respectively, down together.
This shows that the tire rotational speed that the inventive method has obtained when providing a kind of foundation to learn as reference point, participates in setting up the judgment model of actual motion fault tire location.Because reference point has comprehensively embodied the situation of tire specification, air pressure and the degree of wear, thereby judgment model has more common and practical.
Better is that in the said method, the comparative result of step (3) when tying up to continuous several times above default value, just adds their confirmation, and handles as alert situation.Described continuously, refer to it relatively is in the rotating speed that adjacent measurement or measurement calculate, to carry out; Can be corresponding rotating speed relatively, also can be the formula that contains each rotating speed.This method can be avoided in particular cases, and the false alarm that bigger variation may bring appears in data when rugged as the road surface.
Further, in the said method, in the step (4), if | rotating speed left side difference benchmark-survey meter left side difference rotating speed |=| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |, then also carry out following processing, relatively judge | survey metering rotating speed-rotating speed benchmark |＞default value * 2?:
If then further relatively judge rotating speed left side difference benchmark＜survey meter left side difference rotating speed? if, then show the near front wheel, off hind wheel fault, otherwise, off-front wheel, left rear wheel fault shown.This method provides the foundation of analysing in depth both sides tire situation, especially occurs the under-voltage situation of equivalent simultaneously for the diagonal angle tire, does further to analyze.
Further, said method is in the step (3), when comparative result is no more than default value, carry out following relatively judgement: if | real left front-as to learn left front |＞default value * 2, and | real right front-is right front | and＞default value * 2 show that then the near front wheel, off-front wheel break down; If | real left back-as to learn left back |＞default value * 2, and | real right back-as to learn right back |＞default value * 2 show that then left rear wheel, off hind wheel break down.The method provides the foundation of further analysis both sides tire situation again, occurs the under-voltage situation of equivalent simultaneously at coaxial tire, does further to analyze.
Be more preferably, said method in the step (5), also carries out record to each tire rotational speed constantly, especially, and when tire fault occurring, together with the other record of quilts such as alerting signal, tire location, the number of stoppages and recovery situation.
Realize system for carrying out said process, comprise a tire signal interface circuit that is used to obtain the doughnut turn signal and changes; Button and interface circuit thereof; Hummer and interface circuit thereof; Display screen and interface circuit thereof; Data are provided with circuit; A brake interface circuit; A power circuit; A single-chip microcomputer, it is handled according to the signal that tire signal interface circuit, button and interface circuit thereof, brake interface circuit, data are provided with circuit and provide, and result is sent to display screen and interface circuit, hummer and interface circuit thereof, be characterized in that single-chip microcomputer is handled according to follow procedure:
(1), obtain the pulse signal of each tire of automobile, calculate each tire rotational speed, as a comparison the rotating speed reference point of Pan Duaning from the tire signal interface circuit;
(2), obtain the pulse signal of each tire of automobile, calculate the current rotating speed of each tire, and calculate from the tire signal interface circuit:
The rotating speed benchmark=| (it is right back to learn left front+)-(it is left back to learn right front+) |,
The survey metering rotating speed=| (real left front+real right back)-(real right front+real left back) |,
Compare rotating speed benchmark and the size of surveying metering rotating speed, result as a comparison;
(3), above-mentioned comparative result is judged,, then send alerting signal to hummer and interface circuit thereof if comparative result surpasses default value, otherwise, turn to step (2);
(4), calculate:
Rotating speed left side difference benchmark=is left front-learn left back, the right poor benchmark of rotating speed=is right front-right back,
Survey meter left side difference rotating speed=reality left front-real left back, survey the right difference of meter rotating speed=reality right front-right back in fact,
If | rotating speed left side difference benchmark-survey meter left side difference rotating speed |＞| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |, do you then relatively judge and survey meter left side difference rotating speed＞rotating speed left side difference benchmark? if, then send " the near front wheel fault " to display screen and interface circuit thereof, otherwise, send " left rear wheel fault " to display screen and interface circuit thereof;
If | rotating speed left side difference benchmark-survey meter left side difference rotating speed |＜| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |, do you then relatively judge and survey the right difference of the meter rotating speed＞right difference of rotating speed benchmark? if, then send " off-front wheel fault " to display screen and interface circuit thereof, otherwise, send " off hind wheel fault " to display screen and interface circuit thereof.
(5), turn to step (2).
Therefore invention provides a kind of microprocessor system of realizing said method, and this system also has the characteristics that said method is mentioned.
In the said system, the comparative result of step (3) when tying up to continuous several times above default value, just adds their confirmation, and handles as alert situation.System has realized avoiding above-mentioned false alarm.
Said system, in the step (4), if | rotating speed left side difference benchmark-survey meter left side difference rotating speed |=| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |, then also carry out following processing, relatively judge | survey metering rotating speed-rotating speed benchmark |＞default value * 2?
If then further relatively judge rotating speed left side difference benchmark＜survey meter left side difference rotating speed? if, then send " the near front wheel, off hind wheel fault " to display screen and interface circuit thereof, otherwise, send " off-front wheel, left rear wheel fault " to display screen and interface circuit thereof.Make system possess the identification diagonal angle tire under-voltage ability of equivalent simultaneously.
Said system, in the step (3), when comparative result is no more than default value, carry out following relatively judgement: if | real left front-as to learn left front |＞default value * 2, and | real right front-as to learn right front |＞default value * 2, then send " the near front wheel, off-front wheel break down " to display screen and interface circuit thereof; If | real left back-as to learn left back |＞default value * 2, and | real right back-as to learn right back |＞default value * 2, then send " left rear wheel, off hind wheel break down " to display screen and interface circuit thereof.Allow system possess the coaxial tire of the identification under-voltage ability of equivalent simultaneously.
In the said system, also comprise eeprom circuit, in step (5), also each tire rotational speed is constantly carried out record, especially, when tire fault occurring, be recorded in the eeprom circuit by emphasis together with alerting signal, tire location, the number of stoppages and recovery situation.
Advantage and effect
1, system of this method or system carries out data sampling according to the concrete condition of each tire of automobile, set up reference point, and according to these reference points, participate in the position of failure judgement tire, further improved accuracy, enlarged accommodation, solved prior art because the difference of specification, air pressure and the degree of wear of tire, the influence that the abort situation judgment accuracy is caused and be difficult to make the accurately problem of report of position.
2, this method or system occur the under-voltage situation of equivalent for coaxial or two tires in diagonal angle when simultaneously, can carry out prediction and alarm equally, help removing a hidden danger, report to the police early, improve reaction capacity, are convenient to the driver and understand early, take corresponding measure.Remedy the deficiency of former method and system to the angular data comparison.
3, method or system can carry out record to each tire rotational speed constantly, especially, when tire fault occurring, by the other record of emphasis, can be used as the foundation of each side's responsibilities such as distinguishing the producer and user together with alerting signal, tire location, the number of stoppages and recovery situation etc.
The drawing explanation
Fig. 1 is the power circuit of embodiment of the invention system;
Fig. 2 is that the data of embodiment of the invention system are provided with circuit;
Fig. 3 is the tire signal interface circuit of embodiment of the invention system;
Fig. 4 is the display screen and the interface circuit thereof of embodiment of the invention system;
Fig. 5 is the single card microcomputer circuit of embodiment of the invention system;
Fig. 6 is embodiment of the invention method step and system software block scheme;
Fig. 7 is the block scheme of the fault analysis one of Fig. 6;
Fig. 8 is the block scheme of the fault analysis two of Fig. 6;
Fig. 9 is the block scheme of the fault analysis three of Fig. 6.
Embodiment
With reference to Fig. 1, this circuit provides direct supply for system works, and wherein, connector JP1 connects the direct current (10V-18V) on the car, becomes VCC (DC5V) voltage after rectification, filtering and voltage stabilizing.
With reference to Fig. 2, this circuit can be adjusted 10 bit switches of DIP10 according to different automobile types, different requirement for manually to single chip computer AT 89S52 data being set; These data can be used for adjusting default value, specifically determine as follows: 4666 * 10
-6Revolutions per second+n * 1333 * 10
-7Revolutions per second, wherein n is data the numerical value that circuit DIP10 is provided with is set.
With reference to Fig. 3, this circuit obtains signal from vehicle speed sensor, and amplify conversion, wherein, connector JP3 connects vehicle speed sensor, by capacitor C in1, Cin2, Cin3, direct current component in the Cin4 isolation signals, signal is respectively through UAA, UAB, UAC, UAD amplifies, form pulse signal FL by integrated 74LS14 shaping filter again, FR, BL, BR, be used to connect AT89S52, UPB adjusts by VF and makes the UPB output voltage between the threshold values of 74LS14, in addition, by diode D11, D12, D13, D14 carries out filtering, can prevent that abnormal situation from appearring by force in AC signal.
With reference to Fig. 4, circuit comprises Chinese LCD display and interface circuit thereof, and button K, hummer B.Connector JP7 is connected with connector JP4, PIN1, PIN6 are respectively VCC and GND, PIN2, PIN3 are AT89S52 and the pin of communicating by letter of AT89C2051, by the data that AT89S52 sends, AT89C2051 receives the back and responds, and will be presented on the Chinese LCD for information about simultaneously, CE20 and R20 form reset circuit, for AT89C2051 provides electrification reset, oscillatory circuit, base when providing for AT89C2051 are provided for X2, C21, C22.
With reference to Fig. 5, this circuit is mainly the microprocessor part.By being connected of connector JP4 and connector JP7, wherein, whether P1.2 is used to detect Fig. 4 button K operates, and has constituted button and interface circuit thereof with button K; P1.3 sounds by transistor T 1 control chart 4 hummer B, has constituted hummer and interface circuit thereof with hummer B; Connector JP2 and optocoupler PCX constitute the brake interface circuit, and when brake, the P1.4 state of AT89S52 changes, and can detect; AT89S52 connects four FL, FR, BL, BR signals after treatment; The P3.0 of AT89S52, P3.1 connect different external units (as JP7) according to JP4, and exportable different signal is so that people utilize; In addition, RST connects the RESET pin of integrated X5045, and AT89S52 is resetted, and AT89S52 is resetted; P3.4, P3.5, P3.6, P3.7 are connected with X5045, and X5045 also will provide storage for data except that providing the reset signal for AT89S52, when making the circuit dead electricity, data can not lost, simultaneously, after the AT89S52 program was run fast, X5045 can be its function that house dog is provided; Circuit also comprises high-performance low-power-consumption real time clock circuit DS1302 and high capacity eeprom chip AT24C256, they all are connected with single chip computer AT 89S52 by three-way, be used to the moment and the storage data that provide detailed, guarantee under the situation of power-off or outage, continue timing and retention data.
The embodiment of the inventive method and system is described in detail in detail below in conjunction with accompanying drawing:
The step of method or program design roughly can be divided into three parts, be that reference point is set up part and test section, some common step are arranged between the two large divisions, be designed to another part, this part comprises and measures each tyre rotation number of turns, data validation and each tire rotational speed of calculating etc.Reference point is set up part, comprises setting up reference point, and as the foundation of judging tyre underpressure and under-voltage tire location, the rotating speed reference point according to this part is set up has more accuracy, has removed the influence of some accidentalia.The test section comprises fault judgement, fault analysis and data recording.Reference point is set up part and test section, separately, enters step separately after judging whether to put the study mark.
Reference point is set up part, need measure two groups of data, mainly comprise the study numerical value that measures each tire, study numerical value validity check, establish accurate reference point, establish comparable data, to determine the rotating speed reference point, this process is called study, is to set up the comparable data of judging as a comparison.
The formation and the effect of the various piece that makes introductions all round earlier below:
Measure each tyre rotation number of turns: this part measures the rotation number of turns of each tire, can directly obtain count pulse from the sensor on the motor vehicle, and converting then obtains.Usually, because in measuring process, exist possibility of travelling at a slow speed, thereby the data that do not record with moment calculate rotating speed, but requirement is calculated rotating speed to rotate a fixing turn.More specifically, rotating speed is recording a fixing turn as basis, and its speed depends on to be measured the required time.
Data validation: in fact, in the measuring of the tyre rotation number of turns, computation process, also need to check its validity.No matter set up reference point or testing process, the rotating speed instantaneous variation is very big when brake, and data do not possess representativeness, do not have essential meaning, should give eliminating, but also must remove the time of measuring these number of turns, to guarantee the accuracy of revolution speed calculating.More specifically, when measuring the tyre rotation number of turns, judge current whether the brake, add up into number of total coils and T.T. if any the number of turns that then this is not recorded, required time.
Calculate each tire rotational speed: after data validation, calculate each tire rotational speed according to a fixing turn and the required Measuring Time of the actual tyre rotation that records.
Measure each tire study numerical value: relearn for new tire, repairing rear tyre, pressurization tire, order set, all need to obtain its rotating speed comparable data, obtain, be called study numerical value, intend being used to calculate reference point by each tire rotational speed of aforementioned calculation.
Study numerical value validity check: the study numerical value that records, should carry out validity check, when meeting the following conditions, data are effective: the speed of a motor vehicle＞20 kilometer/hour and the speed of a motor vehicle＜80 kilometer/hour, and wherein, the speed of a motor vehicle is 2 * π * R * N, R is the common radius of tire, and N is a tire rotational speed.
Establish accurate reference point: obtain six times (group) and effectively learn numerical value through above-mentioned study numerical value validity check, and calculate their following absolute values respectively: | (learn left front-learn right front)-(it is right back to learn left back-) |, and minimum and maximum each of absolute value given up for one group, from remain four groups of study numerical value, calculate the rotating speed mean value of each tire respectively, as accurate reference point.
Establish comparable data: the front and back secondary has obtained accurate reference point 1 and accurate reference point 2 according to the method for establishing accurate reference point, if they the two | (learns left front-learn right front)-(it is right back to learn left back-) | absolute value differences, its absolute value is not more than 1333 * 10
-7Revolutions per second the time, get the mean speed that accurate reference point 1 and accurate reference point 2 calculate each tire again, as the rotating speed reference point, if they | (learns left front-learn right front)-(it is right back to learn left back-) | absolute value differences, its absolute value is greater than 1333 * 10
-7Revolutions per second the time, establish once accurate reference point again, obtain accurate reference point 3, compare with accurate reference point 2 and accurate reference point 3, by that analogy, until the accurate reference point of last secondary, they | (it is right front to learn left front-)-(it is right back to learn left back-) | absolute value differences, its absolute value is not more than 1333 * 10
-7Revolutions per second, the mean value of accurate reference point of getting last secondary is as the rotating speed reference point.
Method step or program circuit that present embodiment is concrete are as follows:
With reference to Fig. 6-Fig. 9, during start, the advanced line program initialization of AT89S52, and follow these steps to operation:
1, in step 10, judge whether to receive the order that sends record from communication interface P3.0, the P3.1 of connector JP4? in this way, then read in record from EEPROM, comprise time, each tire rotational speed, alerting signal, fault tire location, the number of stoppages and recovery situation, be sent to the external unit (not drawing among the figure) with communication interface P3.0, P3.1, as backup to be looked into;
2, in the step 20, show the version that uses at display screen LCD;
3, in the step 30, read the EEPROM data, comprise state (normally, study, warning), fault tire location, the number of stoppages and recovery situation;
4, in the step 40, from real time clock circuit DS1302, read the current time, be recorded in EEPROM together with the state of starting shooting, resetting;
Does 5, in the judgement state, study mark whether by set in the step 50? in this way, the establishment process that expression below will enter reference point is not as being then to change step 200;
6, in the step 60, in display screen LCD demonstration " learning ... ";
7, in the step 70, carry out data initialization;
8, in the step 80, the pulse of reading four tires from the tire signal interface circuit, and count respectively;
9, do you in the step 90, judge that the pulse that obtains reaches a certain numerical value? as do not reach, turn to step 220;
10, in the step 100, calculate the rotating speed of each tire;
Is 11, in the judgement state, study labeled as " 1 " in the step 110?, as not being to turn to step 300;
12, do you in the step 120, judge 5.56 meter per seconds＜rotating speed * 2 π R＜22.22 meter per seconds? as not being to turn to step 800;
13, in the step 130,, determine comparable data according to the method for above-mentioned definite comparable data;
14, in the step 140, the rotating speed reference point writes EEPROM;
15, in the step 150, the reset of study mark shows " operation is normal ... " at display screen LCD, and the expression learning process finishes;
16, turn to step 800;
17, in the step 200, in the judgement state, whether warning label by set, as not being to turn to step 70;
18, in the step 210, show " warning ... " at display screen LCD and show the fault tire location, turn to step 70;
19, in the step 220, from the keystroke interface circuit, read in data, judge and press learning key K? as not being to turn to step 240;
20, in the step 230, in that display screen LCD shows " learning ... ", accumulative total rotate the number of turns in time between, the set of study mark turns to step 80;
21, in the step 240,, judge whether brake from brake interface circuit reading of data? as not being to turn to step 80;
22, in the step 250,, deduct the rotation number of turns and the brake time of just having added up in that display screen LCD shows " braking ... ";
23, in the step 260, before recovering to brake, the display screen state turns to step 70;
24, do you in the step 300, judge 5.56 meter per seconds＜rotating speed * 2 π R＜55.56 meter per seconds?, as not being to turn to step 800;
Is 25, in the judgement state, warning label " 1 " in the step 310? if turn to step 375;
26, in the step 320, the numerical value n that reads DIP10 the circuit is set, judges from data | survey metering rotating speed-rotating speed benchmark |＜2333 * 10
-6Revolutions per second+n * 1333 * 10
-7Revolutions per second? if not, turn to step 500;
27, in the step 330, judge | real left front-as to learn left front |, | real right front-as to learn right front |＜4666 * 10
-6Revolutions per second+n * 1333 * 10
-7Revolutions per second? if not, turn to step 600;
28, in the step 340, judge | real left back-as to learn left back |, | real right back-as to learn right back |＜4666 * 10
-6Revolutions per second+n * 1333 * 10
-7Revolutions per second? if not, turn to step 700;
29, in the step 350, with left front meter, right front meter, left back meter, right back meter zero clearing;
30, turn to step 800;
31, in the step 500, calculate:
Rotating speed left side difference benchmark=is left front-learn left back, the right poor benchmark of rotating speed=is right front-learn right back, survey meter left side difference rotating speed=reality left front-real left back, survey the poor rotating speed in the meter right side=reality right front-right back in fact,
32, in the step 505, judge | rotating speed left side difference benchmark-survey meter left side difference rotating speed |＜| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |? if turn to step 525;
33, do you in the step 510, judge and survey meter left side difference rotating speed＞rotating speed left side difference benchmark? if not, turn to 520;
34, in the step 515, left front meter adds " 1 " (continuously unusual number of times of cumulative data, down together), and right front meter, left back meter, right back meter clear " 0 " turn to step 540;
35, in the step 520, left back meter adds " 1 ", and left front meter, right front meter, right back meter clear " 0 " turn to step 550;
36, do you in the step 525, judge and survey the right difference of the meter rotating speed＞right difference of rotating speed benchmark? if not, turn to step 535;
37, in the step 530, right front meter adds " 1 ", and left front meter, left back meter, right back meter clear " 0 " turn to step 560;
38, in the step 535, right back meter adds " 1 ", and left front meter, left back meter, right front meter clear " 0 " turn to step 570;
39, do you in the step 540, judge left front meter=" 4 " (data exception read-around ratio accumulative total reaches qualification quantity, down together)?, if not, turn to step 580;
40, in the step 545, put the near front wheel fault flag, turn to step 580;
41, in the step 550, judge left back meter=" 4 ", if not, turn to step 580;
42, in the step 555, put the left rear wheel fault flag, turn to step 580;
43, in the step 560, judge right front meter=" 4 ", if not, turn to step 580;
44, in the step 565, put the off-front wheel fault flag, turn to step 580;
45, in the step 570, judge off hind wheel=" 4 ", if not, turn to step 580;
46, in the step 575, put the off hind wheel fault flag;
47, in the step 580, turn to step 360;
48, in the step 600, left front meter, right front meter all add " 1 ", and left back meter, right back meter be clear " 0 " all;
49, do you in the step 610, judge that left front meter, right front meter are " 4 "? if not, turn to step 680;
50, in the step 620, put the near front wheel, off-front wheel fault flag;
51, in the step 680, turn to step 360;
52, in the step 700, left back meter, right back meter all add " 1 ", and left front meter, right front meter be clear " 0 " all;
53, do you in the step 710, judge that left back meter, right back meter are " 4 "? if not, turn to step 780;
54, in the step 720, put left rear wheel, off hind wheel fault flag;
55, in the step 780, turn to step 360;
Do 56, (being that the near front wheel, left rear wheel, off-front wheel, off hind wheel are put fault flag) take place in failure judgement in the step 360? if do not have, turn to step 800;
57, in the step 365, buzzer warning (promptly sending drive signal), warning label set (expression is reported to the police) to hummer and interface circuit thereof;
58, in the step 370, show fault tire location (according to the fault flag of the near front wheel, left rear wheel, off-front wheel, off hind wheel, to the information of display screen and interface circuit transmission failure tire location thereof), turn to step 800 at display screen LCD;
60, in the step 375, judge | survey metering rotating speed-rotating speed benchmark |＜3333 * 10
-7Revolutions per second?, if not, turn to step 800;
61, in the step 380, recover meter and add " 1 ";
62, do you in the step 385, judge and recover to count " 4 "? if not, turn to step 800;
63, in the step 390, warning label clear " 0 " shows " operation is normal ... " at display screen LCD;
64, in the step 395, recover the meter reset;
65, step 800 writes EEPROM with the rotating speed of time, each tire, state (normal, study, report to the police), fault tire location, the number of stoppages and recovery situation, turns to step 70.
66, step 900, judge | survey metering rotating speed-rotating speed benchmark |＜4666 * 10
-6Revolutions per second+n * 1333 * 10
-7Revolutions per second?, if not, turn to step 580;
Is 67, step 910 judged and is surveyed meter left side difference rotating speed＞rotating speed left side difference benchmark? if not, turn to step 920;
68, step 915, left front meter=left front meter+1, right back meter=right back meter+ 1, right front meter=0, left back meter=0;
Is 69, step 940 judged left front meter=4 and right back meter=4? if not, turn to step 580;
70, step 945 is put the near front wheel, off hind wheel fault flag, turns to step 580;
71, step 920, right front meter=right front meter+1, left back meter=left back meter+ 1, left front meter=0, right back meter=0;
Is 72, step 950 judged right front meter=4 and left back meter=4? if not, turn to step 580;
73, step 955 is put off-front wheel, left rear wheel fault flag, turns to step 580.
So far, we have seen a kind of very specific embodiment of the inventive method and system.In addition, the relevant issues of not addressing herein see also application for a patent for invention CN1623809A.
Claims (12)
1, a kind of monitoring method of air pressure of automobile tire variation is characterized in that:
(1), obtains, calculates the rotating speed of each tire of automobile, the rotating speed reference point of Pan Duaning as a comparison;
(2), obtain, calculate the rotating speed of current each tire of automobile, calculate:
The rotating speed benchmark=| (it is right back to learn left front+)-(it is left back to learn right front+) |,
The survey metering rotating speed=| (real left front+real right back)-(real right front+real left back) |,
And comparison rotating speed benchmark and the size of surveying metering rotating speed, result as a comparison;
(3), above-mentioned comparative result is judged,, then report to the police if comparative result surpasses default value, otherwise, turn to step (2);
(4), calculate:
Rotating speed left side difference benchmark=is left front-learn left back, the right poor benchmark of rotating speed=is right front-right back,
Survey meter left side difference rotating speed=reality left front-real left back, survey the right difference of meter rotating speed=reality right front-right back in fact,
Relatively | rotating speed left side difference benchmark-surveys meter left side difference rotating speed | with | the right difference of the rotating speed benchmark-poor rotating speed in surveys meter right side | size:
If | rotating speed left side difference benchmark-survey meter left side difference rotating speed |＞| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |, then relatively judge and whether survey meter left side difference rotating speed greater than rotating speed left side difference benchmark, if, then show the near front wheel fault, otherwise, the left rear wheel fault shown;
If | rotating speed left side difference benchmark-survey meter left side difference rotating speed |＜| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |, then relatively judge and whether survey the right difference of meter rotating speed greater than the right difference of rotating speed benchmark, if, then show the off-front wheel fault, otherwise, the off hind wheel fault shown;
(5), turn to step (2);
Wherein, described left front, learn left back, learn right front, learn right back rotating speed reference point when referring to respectively that the near front wheel, left rear wheel, off-front wheel, off hind wheel are learnt at the beginning; Real left front, real left back, real right front, the real right back current actual speed that refers to the near front wheel, left rear wheel, off-front wheel, off hind wheel respectively.
According to the method for claim 1, it is characterized in that 2, described rotating speed reference point calculates definite according to the method for establishing comparable data.
According to the method for claim 1 or 2, it is characterized in that 3, the comparative result of described step (3) when tying up to continuous several times above default value, just adds their confirmation, and handles as alert situation.
4, according to the method for claim 3, it is characterized in that, in the described step (4), if | rotating speed left side difference benchmark-survey meter left side difference rotating speed |=| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |, then also carry out following processing, relatively judge | survey metering rotating speed-rotating speed benchmark | whether greater than default value * 2; If, judge relatively further then whether rotating speed left side difference benchmark counts left side difference rotating speed less than surveying, if, then show the near front wheel, off hind wheel fault, otherwise, off-front wheel, left rear wheel fault shown.
5, according to the method for claim 3, it is characterized in that, in the described step (3), when comparative result is no more than default value, carry out following relatively judgement: if | real left front-as to learn left front |＞default value * 2, and | real right front-as to learn right front |＞default value * 2 show that then the near front wheel, off-front wheel break down; If | real left back-as to learn left back | I＞default value * 2, and | real right back-as to learn right back |＞default value * 2 show that then left rear wheel, off hind wheel break down.
6, according to the method for claim 4, it is characterized in that, in the described step (3), when comparative result is no more than default value, carry out following relatively judgement: if | real left front-as to learn left front |＞default value * 2, and | real right front-as to learn right front |＞default value * 2 show that then the near front wheel, off-front wheel break down; If | real left back-as to learn left back | I＞default value * 2, and | real right back-as to learn right back |＞default value * 2 show that then left rear wheel, off hind wheel break down.
7, a kind of monitoring system of air pressure of automobile tire variation comprises a tire signal interface circuit that is used to obtain the doughnut turn signal and changes; Button and interface circuit thereof; Hummer and interface circuit thereof; Display screen and interface circuit thereof; Data are provided with circuit; A brake interface circuit; A power circuit; A single-chip microcomputer, it is handled according to the signal that tire signal interface circuit, button and interface circuit thereof, brake interface circuit, data are provided with circuit and provide, and result is sent to display screen and interface circuit, hummer and interface circuit thereof, it is characterized in that single-chip microcomputer is handled according to follow procedure:
(1), obtain the pulse signal of each tire of automobile, calculate each tire rotational speed, as a comparison the rotating speed reference point of Pan Duaning from the tire signal interface circuit;
(2), obtain the pulse signal of each tire of automobile, calculate the current rotating speed of each tire, and calculate from the tire signal interface circuit:
The rotating speed benchmark=| (it is right back to learn left front+)-(it is left back to learn right front+) |,
The survey metering rotating speed=| (real left front+real right back)-(real right front+real left back) |,
Compare rotating speed benchmark and the size of surveying metering rotating speed, result as a comparison;
(3), above-mentioned comparative result is judged,, then send alerting signal to hummer and interface circuit thereof if comparative result surpasses default value, otherwise, turn to step (2);
(4), calculate:
Rotating speed left side difference benchmark=is left front-learn left back, the right poor benchmark of rotating speed=is right front-right back,
Survey meter left side difference rotating speed=reality left front-real left back, survey the right difference of meter rotating speed=reality right front-right back in fact,
If | rotating speed left side difference benchmark-survey meter left side difference rotating speed |＞| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |, then relatively judge and whether survey meter left side difference rotating speed greater than rotating speed left side difference benchmark, if, then send " the near front wheel fault " to display screen and interface circuit thereof, otherwise, send " left rear wheel fault " to display screen and interface circuit thereof;
If | rotating speed left side difference benchmark-survey meter left side difference rotating speed |＜| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |, then relatively judge and whether survey the right difference of meter rotating speed greater than the right difference of rotating speed benchmark, if, then send " off-front wheel fault " to display screen and interface circuit thereof, otherwise, send " off hind wheel fault " to display screen and interface circuit thereof;
(5), turn to step (2);
Wherein, described left front, learn left back, learn right front, learn right back rotating speed reference point when referring to respectively that the near front wheel, left rear wheel, off-front wheel, off hind wheel are learnt at the beginning; Real left front, real left back, real right front, the real right back current actual speed that refers to the near front wheel, left rear wheel, off-front wheel, off hind wheel respectively.
According to the system of claim 7, it is characterized in that 8, described rotating speed reference point calculates definite according to the method for establishing comparable data.
According to the system of claim 7 or 8, it is characterized in that 9, the comparative result of described step (3) when tying up to continuous several times above default value, just adds their confirmation, and handles as alert situation.
10, according to the system of claim 9, it is characterized in that, in the described step (4), if | rotating speed left side difference benchmark-survey meter left side difference rotating speed |=| the right difference of the rotating speed benchmark-right difference of survey meter rotating speed |, then also carry out following processing, relatively judge | survey metering rotating speed-rotating speed benchmark | whether greater than default value * 2; If, judge relatively further that then whether rotating speed left side difference benchmark is less than surveying meter left side difference rotating speed, if then send " the near front wheel, off hind wheel fault " to display screen and interface circuit thereof, otherwise, send " off-front wheel, left rear wheel fault " to display screen and interface circuit thereof.
11, according to the system of claim 9, it is characterized in that, in the described step (3), when comparative result is no more than default value, carry out following relatively judgement: if | real left front-as to learn left front |＞default value * 2, and | real right front-as to learn right front |＞default value * 2, then send " the near front wheel, off-front wheel break down " to display screen and interface circuit thereof; If | real left back-as to learn left back |＞default value * 2, and | real right back-as to learn right back |＞default value * 2, then send " left rear wheel, off hind wheel break down " to display screen and interface circuit thereof.
12, according to the system of claim 10, it is characterized in that, in the described step (3), when comparative result is no more than default value, carry out following relatively judgement: if | real left front-as to learn left front |＞default value * 2, and | real right front-as to learn right front |＞default value * 2, then send " the near front wheel, off-front wheel break down " to display screen and interface circuit thereof; If | real left back-as to learn left back |＞default value * 2, and | real right back-as to learn right back |＞default value * 2, then send " left rear wheel, off hind wheel break down " to display screen and interface circuit thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100367280A CN100425967C (en) | 2005-08-17 | 2005-08-17 | Method for monitoring air pressure variation of automobile tyre and system for realizing the method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100367280A CN100425967C (en) | 2005-08-17 | 2005-08-17 | Method for monitoring air pressure variation of automobile tyre and system for realizing the method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1731121A CN1731121A (en) | 2006-02-08 |
| CN100425967C true CN100425967C (en) | 2008-10-15 |
Family
ID=35963517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100367280A Expired - Fee Related CN100425967C (en) | 2005-08-17 | 2005-08-17 | Method for monitoring air pressure variation of automobile tyre and system for realizing the method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100425967C (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5589815A (en) * | 1993-11-02 | 1996-12-31 | Honda Giken Kogyo Kabushiki Kaisha | System for determining pneumatic tire pressure for motor vehicle |
| JPH11198619A (en) * | 1998-01-16 | 1999-07-27 | Denso Corp | Tire air pressure estimating device |
| US6246316B1 (en) * | 2000-02-23 | 2001-06-12 | Richard L. Andsager | Trailer tire pressure-monitoring system |
| CN1374510A (en) * | 2001-03-08 | 2002-10-16 | 国际计测器株式会社 | Equipment and method for measuring tyre uniformity and/or dynamic balance |
| CN1480865A (en) * | 2002-09-05 | 2004-03-10 | 北京新联铁科贸有限公司 | Method for matching wheel pair of vehicle and system |
| CN1570587A (en) * | 2003-07-22 | 2005-01-26 | 烟台麦特电子有限公司 | Measuring method and device for intellectualized four-wheel orientator |
| CN1623809A (en) * | 2003-05-19 | 2005-06-08 | 汕头高新技术产业开发区东奇汽车科技有限公司 | Method for monitoring pressure vehicle tyre and system of realizing said method |
-
2005
- 2005-08-17 CN CNB2005100367280A patent/CN100425967C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5589815A (en) * | 1993-11-02 | 1996-12-31 | Honda Giken Kogyo Kabushiki Kaisha | System for determining pneumatic tire pressure for motor vehicle |
| JPH11198619A (en) * | 1998-01-16 | 1999-07-27 | Denso Corp | Tire air pressure estimating device |
| US6246316B1 (en) * | 2000-02-23 | 2001-06-12 | Richard L. Andsager | Trailer tire pressure-monitoring system |
| CN1374510A (en) * | 2001-03-08 | 2002-10-16 | 国际计测器株式会社 | Equipment and method for measuring tyre uniformity and/or dynamic balance |
| CN1480865A (en) * | 2002-09-05 | 2004-03-10 | 北京新联铁科贸有限公司 | Method for matching wheel pair of vehicle and system |
| CN1623809A (en) * | 2003-05-19 | 2005-06-08 | 汕头高新技术产业开发区东奇汽车科技有限公司 | Method for monitoring pressure vehicle tyre and system of realizing said method |
| CN1570587A (en) * | 2003-07-22 | 2005-01-26 | 烟台麦特电子有限公司 | Measuring method and device for intellectualized four-wheel orientator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1731121A (en) | 2006-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101488238A (en) | Coach running data recording device and method for accident analysis by applying the device | |
| CN103700160A (en) | Motor vehicle onboard terminal based on microsensor and driving behavior judgment method | |
| CN102717765A (en) | Fatigue driving detection method and anti-fatigue driving auxiliary device | |
| CN201311669Y (en) | Oil consumption real-time monitoring instrument | |
| CN108985833A (en) | A kind of method and system of vehicle valuation | |
| CN202066866U (en) | Railcar intelligent speedometer | |
| CN103810758A (en) | Working method and working device for credibly judging TAXI taximeter accuracy by combining GPS (global positioning system) and Beidou positioning system | |
| CN108556568A (en) | vehicle tyre detection device | |
| CN113183973A (en) | Tire pressure monitoring and road surface information intelligent sensing platform and method based on CAN network | |
| CN113654566A (en) | Positioning performance evaluation method of road side system, storage medium and vehicle-road cooperative system | |
| CN112722010A (en) | Rail corrugation acoustic diagnosis system for rail transit | |
| CN100425967C (en) | Method for monitoring air pressure variation of automobile tyre and system for realizing the method | |
| CN104216397A (en) | Failure recognition and detection method for intelligent drive axle system | |
| CN101391564A (en) | Monitoring method for variation of automotive tire pressure and system for implementing monitoring method | |
| CN201984549U (en) | Passenger bus running data recording device | |
| US7395177B2 (en) | Method for monitoring tire pressure variation of automobile tire and system for realizing the same | |
| CN104271428A (en) | Method for surveying rail-wheel contact | |
| CN2789845Y (en) | Vehicle running recorder | |
| CN210591925U (en) | Axle box vibrating wheel diameter difference detection system | |
| CN202929703U (en) | Driving recording instrument based ARM (Advanced RISC Machines) | |
| CN203785764U (en) | Shaft type detection device | |
| CN201000456Y (en) | Signal intelligentized process unit plate for wheel sensor | |
| CN208607528U (en) | A kind of automobile electrically-controlled module data digging system | |
| CN202523114U (en) | Taximeter with intelligent diagnosis and anti-spam function | |
| CN110789278A (en) | Tire pressure monitoring method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081015 Termination date: 20170817 |