CN1978228A - Apparatus, method and program for alarming abnormality in tire air-pressure - Google Patents
Apparatus, method and program for alarming abnormality in tire air-pressure Download PDFInfo
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- CN1978228A CN1978228A CN 200610169022 CN200610169022A CN1978228A CN 1978228 A CN1978228 A CN 1978228A CN 200610169022 CN200610169022 CN 200610169022 CN 200610169022 A CN200610169022 A CN 200610169022A CN 1978228 A CN1978228 A CN 1978228A
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Abstract
The present invention provides an apparatus, method and program for detecting abnormality in tire air-pressure which allow detecting abnormality in tire air-pressure even if pressure in a tire is completely zero. The apparatus for alarming abnormality in tire air-pressure includes means of (1) calculating the acceleration variations of respective tires from accelerations of the tires calculated by rotational wheel velocities; (2) comparing the calculated acceleration variations of the respective tires; and (3) detecting air-pressure in a tire is abnormal when the acceleration variation of the tire is larger than the acceleration variations of the remaining tires as a result of comparison.
Description
Technical field
The present invention relates to alarming abnormality in tire air-pressure device, method and program.
Background technology
Even if be zero zero-pressure that also can travel type (run-flat) tire of guaranteeing especially, be difficult to the detection wheel air pressure and reduce such as tire pressure.When high vehicle speeds under the situation of low tyre, existence this problem of may blowing out.
Investigate various methods and come the reduction of detection wheel air pressure.If but tire pressure is entirely zero, so because most methods draws according to acceleration/accel variation is that the conclusion of condition of road surface difference is repelled total data, thereby reduction that can't the detection wheel air pressure.
No. 305011/1988 patent gazette of TOHKEMY has disclosed a kind of method of using tire flat warning (DWS) to come the detection wheel air pressure to reduce according to wheel velocity on four-wheel automobile.But this method can't the detection wheel air pressure be zero situation.
Even if the object of the present invention is to provide a kind of tire pressure to be entirely abnormality in tire air-pressure detecting device, method and the program that also allows to detect abnormality in tire air-pressure under the zero situation.
Summary of the invention
One aspect of the present invention relates to the alarming abnormality in tire air-pressure device, and comprising descending array apparatus: (1) is according to the device of the acceleration/accel variation of each tire of tire acceleration calculation that is calculated by vehicle wheel rotational speed; (2) device of the acceleration/accel variation of each tire that is relatively calculated; And (3) judge the device of abnormality in tire air-pressure during greater than the acceleration/accel variation of all the other tires when the acceleration/accel variation that tire is arranged as comparative result.
Device (3) better is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, only this tire acceleration/accel variation more than or equal to first threshold but under the situation of second threshold value that obtains less than multiplying each other, just judge the device of abnormality in tire air-pressure by the peak acceleration variation in the middle of the acceleration/accel variation that will be at least 1 coefficient and all the other tires.
Device (3) better is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, under the situation of peak acceleration variation in the middle of the acceleration/accel variation of this tire acceleration/accel variation all the other tires, judge the device of abnormality in tire air-pressure less than the 4th threshold value greater than the 3rd threshold value.
The alarming abnormality in tire air-pressure device better is further to comprise when tire pressure is judged to be zero by device (3), be under the fast or the slowest situation only, just judge the device (4) of abnormality in tire air-pressure at the vehicle wheel rotational speed that draws this tire that the vehicle wheel rotational speed of this tire is compared with the vehicle wheel rotational speed of all the other tires.
Another aspect of the present invention relates to the alarming abnormality in tire air-pressure method, and comprising the following step: (1) is according to the acceleration/accel variation of each tire of tire acceleration calculation that is calculated by vehicle wheel rotational speed; (2) the acceleration/accel variation of each tire that is relatively calculated; And (3) judge abnormality in tire air-pressure during greater than the acceleration/accel variation of all the other tires when the acceleration/accel variation that tire is arranged as comparative result.
Step (3) better is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, only this tire acceleration/accel variation more than or equal to first threshold but under the situation of second threshold value that obtains less than multiplying each other, just judge the step of abnormality in tire air-pressure by the peak acceleration variation in the middle of the acceleration/accel variation that will be at least 1 coefficient and all the other tires.
Step (3) better is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, under the situation of peak acceleration variation in the middle of the acceleration/accel variation of this tire acceleration/accel variation all the other tires, judge the step of abnormality in tire air-pressure less than the 4th threshold value greater than the 3rd threshold value.
The alarming abnormality in tire air-pressure method better is further to comprise when tire pressure is judged to be zero by step (3), be under the fast or the slowest situation only, just judge the step (4) of abnormality in tire air-pressure at the vehicle wheel rotational speed that draws this tire that the vehicle wheel rotational speed of this tire is compared with the vehicle wheel rotational speed of all the other tires.
Another aspect of the present invention relates to the alarming abnormality in tire air-pressure program, and this program makes computing machine carry out following process: (1) is according to the acceleration/accel variation of each tire of tire acceleration calculation that is calculated by vehicle wheel rotational speed; (2) the acceleration/accel variation of each tire that is relatively calculated; And (3) judge abnormality in tire air-pressure during greater than the acceleration/accel variation of all the other tires when the acceleration/accel variation that tire is arranged as comparative result.
Process (3) better is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, only this tire acceleration/accel variation more than or equal to first threshold but under the situation of second threshold value that obtains less than multiplying each other, just judge the process of abnormality in tire air-pressure by the peak acceleration variation in the middle of the acceleration/accel variation that will be at least 1 coefficient and all the other tires.
Process (3) better is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, under the situation of peak acceleration variation in the middle of the acceleration/accel variation of this tire acceleration/accel variation all the other tires, judge the process of abnormality in tire air-pressure less than the 4th threshold value greater than the 3rd threshold value.
The alarming abnormality in tire air-pressure program better is further to comprise when tire pressure is judged to be zero by process (3), be under the fast or the slowest situation only, just judge the process (4) of abnormality in tire air-pressure at the vehicle wheel rotational speed that draws this tire that the vehicle wheel rotational speed of this tire is compared with the vehicle wheel rotational speed of all the other tires.
According to the present invention, can provide a kind of and can detect the acceleration/accel variation of the acceleration/accel variation of a tire greater than all the other tires by the result who compares as the acceleration/accel variation to each tire, coming the detection wheel air pressure is zero alarming abnormality in tire air-pressure device, method and program.
Description of drawings
Fig. 1 is the block diagram that alarming abnormality in tire air-pressure device one embodiment of the present invention is shown;
Fig. 2 is the block diagram that the electrical arrangement of the alarming abnormality in tire air-pressure device shown in Fig. 1 is shown;
Fig. 3 is graphic to be vehicle wheel rotational speed and the acceleration/accel absolute value sum that is equipped with each tire among the test carriage A of normal barometric pressure tire; And
Fig. 4 is graphic to be vehicle wheel rotational speed and the acceleration/accel absolute value sum that is equipped with each tire among the test carriage B of normal barometric pressure tire.
The specific embodiment
Embodiment
The alarming abnormality in tire air-pressure device of one embodiment of the invention, comprising descending array apparatus: (1) is according to the device of the acceleration/accel variation of each tire of tire acceleration calculation that is calculated by vehicle wheel rotational speed; (2) device of the acceleration/accel variation of each tire that is relatively calculated; And (3) detect the device of abnormality in tire air-pressure during greater than the acceleration/accel variation of all the other tires when the acceleration/accel variation that tire is arranged as comparative result.
Alarming abnormality in tire air-pressure device of the present invention is described with reference to the accompanying drawings.
Fig. 1 is the block diagram that alarming abnormality in tire air-pressure device one embodiment of the present invention is shown.
As shown in Figure 1, whether the alarming abnormality in tire air-pressure device test example of one embodiment of the invention descends as the air pressure of four tires (left front tire (FL tire), right front tire (FR tire), left back tire (RL tire) and right back tire (RR tire)) of being provided with on the vehicle.This alarming abnormality in tire air-pressure device comprises the wheel speed sensors 1 that belongs to the conventional speeds detecting device that each tire is provided.The output of this wheel speed sensors 1 offers control unit 2.Siren horn 3 and initialisation switch 4 are connected to control unit 2.Above-mentioned siren horn 3 comprises such as liquid crystal display cells, plasma display element or cathode ray tube (CRT) and is used for informing that the air pressure of certain tire reduces.Above-mentioned initialisation switch 4 can be handled by the driver.
Because the tire of manufacturing has kind of a species diversity (first difference) in standard range, even if thereby all the internal pressure of tires is all normal, effective radius of rotation of each tire (each numerical value be tire advance the numerical value that the distance passed through in a week obtains divided by 2 π) is not necessarily identical.So spin velocity F of each tire
iDifferent.So, through the spin velocity F1 that revises
iBe to calculate in order to carry out the difference calibration according to first difference.Specifically, the numerical value correction is as follows:
F1
1＝F
1
F1
2＝mF
2
F1
3＝F
3
F1
4＝nF
4
Coefficient of correction m, n are by calculating spin velocity F under vehicle craspedodrome condition
i, and according to the spin velocity F that is calculated
iCalculate m=F
1/ F
2And n=F
3/ F
4
Then according to F1
iCalculate vehicle wheel rotational speed V
i
Try to achieve wheel (tire at a slow speed) and have the wheel (tire fast) of fast rotating speed by following equation with low-rotate speed:
DEL(1)＝{(V1+V4)/2-(V2+V3)/2}/{(V1+V2+V3+V4)/4}×100(％)
DEL(2)＝{(V1+V2)/2-(V3+V4)/2}/{(V1+V2+V3+V4)/4}×100(％)
DEL(3)＝{(V1+V3)/2-(V2+V4)/2}/{(V1+V2+V3+V4)/4}×100(％)
V1 to V4 represents the wheel speed of left front tire (FL tire), right front tire (FR tire), left back tire (RL tire) and right back tire (RR tire) respectively in the above-mentioned equation.
Shown in following table 1 and table 2, judge that to the symbol of DEL (3) which wheel is than slow train wheel or very fast wheel according to the decision content DEL (1) that calculates.
Table 1
| Tire with low-rotate speed | The symbol of DEL_R | ||
| DEL1_R | DEL2_R | DEL3_R | |
| FR tire FL tire RR tire RL tire | + - - + | - - + + | + - + - |
Table 2
| Has the tire of fast rotating speed | The symbol of DEL_R | ||
| DEL1_R | DEL2_R | DEL3_R | |
| FR tire FL tire RR tire RL tire | - + + - | + + - - | - + - + |
The wheel acceleration of tire calculates according to above-mentioned vehicle wheel rotational speed in the step (1).
Acceleration/accel variation is the integrated value (integrated value of each absolute value during promptly 1 second) of the absolute value of 25 acceleration/accels once obtaining of per 40 milliseconds of collections.Under the different situation of the integrated value of a certain tire and the integrated value of other tires, judge this abnormality in tire air-pressure (especially null value air pressure situation) (device (1)).
The acceleration/accel variation of each tire of calculating gained is by subtracting each other each acceleration/accel variation of gained or the ratio computing compares.(device (2)).
Result as a comparison under the situation of the acceleration/accel variation of certain tire greater than the acceleration/accel variation of all the other tires, judges that there be unusual (device (3)) in this tire pressure.Usually, owing to situation (factor of the getting rid of the condition of road surface difference) acceleration/accel that except air pressure is zero can not change, thereby can detect the reduction of tire pressure.But especially zero the air pressure situation is next can't detect pressure abnormity.In contrast, it is that zero its acceleration/accel of a certain tire just changes this fact (situation of condition of road surface difference will have its acceleration change of two or more tires) that device of the present invention then allows according to having only its air pressure, and the air pressure that detects a certain wheel is zero.
Device (3) better is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, only this tire acceleration/accel variation more than or equal to first threshold but under the situation of second threshold value that obtains less than multiplying each other, judge that just tire pressure is zero device by the peak acceleration variation in the middle of the acceleration/accel variation that will be at least 1 coefficient and all the other tires.Such threshold value is to be equipped with the test carriage of normal barometric pressure tire to drive the resulting result of test with the test carriage that is equipped with zero PNEUMATIC TIRES by use to set.
In addition, device (3) better is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, under the situation of peak acceleration variation in the middle of the acceleration/accel variation of this tire acceleration/accel variation all the other tires, judge that tire pressure is zero device less than the 4th threshold value greater than the 3rd threshold value.Such threshold value is to be equipped with the test carriage of normal barometric pressure tire to drive the resulting result of test with the test carriage that is equipped with zero PNEUMATIC TIRES by use to set.
Alarming abnormality in tire air-pressure device of the present invention further comprises when certain tire pressure and being judged to be when unusual by device (3), be under the fast or the slowest situation only at the vehicle wheel rotational speed that draws this tire that the vehicle wheel rotational speed of this tire is compared with the vehicle wheel rotational speed of all the other tires, just judge abnormality in tire air-pressure, specifically, judge that atmospheric pressure value is zero device (4).For a certain reason, the tire that has an acceleration/accel variation maximum and tire situation about not conforming to the fastest or slow train wheel speed.In this case, may not have the pressure abnormity situation, may be for example atmospheric pressure value and non-vanishing situation.This device (4) is set is used for avoiding in these cases providing wrong report just.
When high vehicle speeds (promptly greater than 100 kilometers/time), alarming abnormality in tire air-pressure device of the present invention can be abandoned the detection of device (3) to zero atmospheric pressure value.This is because can't detect zero atmospheric pressure value during running at high speed.
One embodiment of the invention relates to the alarming abnormality in tire air-pressure method, and comprising the following step: (1) is according to the acceleration/accel variation of each tire of tire acceleration calculation that is calculated by vehicle wheel rotational speed; (2) the acceleration/accel variation of each tire that is relatively calculated; And (3) judge that tire pressure is zero during greater than the acceleration/accel variation of all the other tires when the acceleration/accel variation that tire is arranged as comparative result.Present embodiment can be implemented by the mode identical with the situation implemented in the alarming abnormality in tire air-pressure device of the present invention.
In addition, one embodiment of the invention relates to the alarming abnormality in tire air-pressure program, and this program makes computing machine carry out following process: (1) is according to the acceleration/accel variation of each tire of tire acceleration calculation that is calculated by vehicle wheel rotational speed; (2) the acceleration/accel variation of each tire that is relatively calculated; And (3) judge that the tire pressure value is zero during greater than the acceleration/accel variation of all the other tires when the acceleration/accel variation that tire is arranged as comparative result.Present embodiment can be implemented by the mode identical with the situation implemented in the alarming abnormality in tire air-pressure device of the present invention.
Example
Specify the present invention according to each example below.But the present invention is not limited to these examples.
Provide the driving test condition that alarming abnormality in tire air-pressure method of the present invention is confirmed below.Provide test process equally.
(test condition)
Testing vehicle type: FR (preposition engine back-wheel drive) two seat coach
Front tyre specification: 245/40ZR18
Rear tire specification: 265/35ZR18
Test position: sumitomo rubber industrial Okayama test runway and near local straight line highway
(testing vehicle)
Be equipped with the test carriage A of normal barometric pressure tire and be equipped with the test carriage B of the left front tire (all the other tire pressures are normal) of zero air pressure to test by use.
＜the test of travelling 〉
The test of travelling of＜test carriage A 〉
The test of travelling of use test car A and test carriage B will be described below.In the test of travelling, begin in 130 seconds every 1 second calculating one secondary data from test.
(left front tire)
Test is begun 1 second data computation method constantly provided following explanation.
Once detect the vehicle wheel rotational speed of No. 25 the last left front tires of test carriage A during 1 second every 40 milliseconds of detections.According to resulting vehicle wheel rotational speed calculate 25 wheel acceleration wherein each, thereby obtain the absolute value of each wheel acceleration.Then calculate 25 absolute value sums (∑ | FLAcc|) as the absolute value sum of left front tire acceleration/accel that begins 1 second moment from test.
In addition, by utilizing the impulse singla and the sample time of car speed sensor output, come to calculate the vehicle wheel rotational speed (FL that test has begun left front tire of 1 second moment according to 25 vehicle wheel rotational speeds of left front tire
1).
As for resulting (∑ | FLLAcc|) and (FL
1), the summing value of the absolute value of drawing wheel tachometer value and acceleration/accel on chart then, transverse axis is represented vehicle wheel rotational speed among the figure, and on behalf of the absolute value of acceleration/accel, the longitudinal axis (draw (FL
1)).
Same with above-mentioned 1 second method of calculating constantly, by on chart, drawing the data that began from test 2 to 130 seconds, generate the drawing data of the left front tire of test carriage A.
(right front tire, left back tire and right back tire)
Press the data (beginning 1 to 130 second) of drawing each second with " the left front tire of test carriage A " mode that situation is identical, generate the drawing data of the right front tire of test carriage A, left back tire and right back tire from test.
The drawing data of the test carriage A of Sheng Chenging is shown among Fig. 3 in a manner described.
The test of travelling of＜test carriage B 〉
By generating the drawing data of the left front tire of test carriage B, right front tire, left back tire and right back tire with " test of travelling of test carriage A " identical mode.Begin to carry out in lasting 130 seconds above-mentioned test from test.Drawing data is shown among Fig. 4.
＜test result 〉
Among Fig. 3, test carriage A (∑ | FLAcc|) variation is close to 20, (∑ | FRAcc|) variation is close to 30, (∑ | RLAcc|) variation is close to 40, and (∑ | RRAcc|) variation is close to 20.Therefore each variation is near equating.
On the other hand, among Fig. 4 (∑ | FRAcc|) variation is close to 30, (∑ | RLAcc|) variation is close to 30, and (∑ | RRAcc|) variation is close to 20, and these variations are near equating.But (∑ | FLAcc|) variation is close to 70, and is different with other variations.
Thereby can understand, can be that 45 variation threshold value and is that 1.5 coefficient detects zero PNEUMATIC TIRES by setting one.
Though the some embodiment of the present invention have been described above, be appreciated that the present invention is not limited to top described content, can under the situation that does not deviate from its essence and protection domain, carry out all variations and modification.
Claims (12)
1. alarming abnormality in tire air-pressure device comprises array apparatus down:
(1) according to the device of the acceleration/accel variation of each tire of tire acceleration calculation that calculates by vehicle wheel rotational speed; (2) device of the acceleration/accel variation of each tire that is relatively calculated; And (3) detect the device of abnormality in tire air-pressure during greater than the acceleration/accel variation of all the other tires when the acceleration/accel variation that tire is arranged as comparative result.
2. alarming abnormality in tire air-pressure device as claimed in claim 1, it is characterized in that, device (3) is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, only this tire acceleration/accel variation more than or equal to first threshold but under the situation of second threshold value that obtains less than multiplying each other, just detect the device of abnormality in tire air-pressure by the peak acceleration variation in the middle of the acceleration/accel variation that will be at least 1 coefficient and all the other tires.
3. alarming abnormality in tire air-pressure device as claimed in claim 1 or 2, it is characterized in that, device (3) is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, under the situation of peak acceleration variation in the middle of the acceleration/accel variation of this tire acceleration/accel variation all the other tires, detect the device of abnormality in tire air-pressure less than the 4th threshold value greater than the 3rd threshold value.
4. as claim 1 or 2 or 3 described alarming abnormality in tire air-pressure devices, it is characterized in that, further comprise when tire pressure is judged to be zero by device (3), be under the fast or the slowest situation only, just judge the device (4) of abnormality in tire air-pressure at the vehicle wheel rotational speed that draws this tire that the vehicle wheel rotational speed of this tire is compared with the vehicle wheel rotational speed of all the other tires.
5. an alarming abnormality in tire air-pressure method comprises the following steps:
(1) according to the acceleration/accel variation of each tire of tire acceleration calculation that calculates by vehicle wheel rotational speed; (2) the acceleration/accel variation of each tire that is relatively calculated; And (3) detect abnormality in tire air-pressure during greater than the acceleration/accel variation of all the other tires when the acceleration/accel variation that tire is arranged as comparative result.
6. alarming abnormality in tire air-pressure method as claimed in claim 5, it is characterized in that, step (3) is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, only this tire acceleration/accel variation more than or equal to first threshold but under the situation of second threshold value that obtains less than multiplying each other, just detect the step of abnormality in tire air-pressure by the peak acceleration variation in the middle of the acceleration/accel variation that will be at least 1 coefficient and all the other tires.
7. as claim 5 or 6 described alarming abnormality in tire air-pressure methods, it is characterized in that, step (3) is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, under the situation of peak acceleration variation in the middle of the acceleration/accel variation of this tire acceleration/accel variation all the other tires, detect the step of abnormality in tire air-pressure less than the 4th threshold value greater than the 3rd threshold value.
8. as claim 5 or 6 or 7 described alarming abnormality in tire air-pressure methods, it is characterized in that, further comprise, when tire pressure is judged to be zero in step (3), be under the fast or the slowest situation only, just judge the step (4) of abnormality in tire air-pressure at the vehicle wheel rotational speed that draws this tire that the vehicle wheel rotational speed of this tire is compared with the vehicle wheel rotational speed of all the other tires.
9. alarming abnormality in tire air-pressure program, this program makes computing machine carry out following process:
(1) according to the acceleration/accel variation of each tire of tire acceleration calculation that calculates by vehicle wheel rotational speed; (2) the acceleration/accel variation of each tire that is relatively calculated; And (3) detect abnormality in tire air-pressure during greater than the acceleration/accel variation of all the other tires when the acceleration/accel variation that tire is arranged as comparative result.
10. alarming abnormality in tire air-pressure program as claimed in claim 9, it is characterized in that, process (3) is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, only this tire acceleration/accel variation more than or equal to first threshold but under the situation of second threshold value that obtains less than multiplying each other, just detect the process of abnormality in tire air-pressure by the peak acceleration variation in the middle of the acceleration/accel variation that will be at least 1 coefficient and all the other tires.
11. as claim 9 or 10 described alarming abnormality in tire air-pressure programs, it is characterized in that, process (3) is when the acceleration/accel variation of tire during greater than the acceleration/accel variation of all the other tires, under the situation of peak acceleration variation in the middle of the acceleration/accel variation of this tire acceleration/accel variation all the other tires, detect the process of abnormality in tire air-pressure less than the 4th threshold value greater than the 3rd threshold value.
12. as claim 9 or 10 or 11 described alarming abnormality in tire air-pressure programs, it is characterized in that, further comprise when tire pressure is judged to be zero in process (3), be under the fast or the slowest situation only, just judge the process (4) of abnormality in tire air-pressure at the vehicle wheel rotational speed that draws this tire that the vehicle wheel rotational speed of this tire is compared with the vehicle wheel rotational speed of all the other tires.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005354787 | 2005-12-08 | ||
| JP2005354787 | 2005-12-08 | ||
| JP2006274373 | 2006-10-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1978228A true CN1978228A (en) | 2007-06-13 |
| CN100478198C CN100478198C (en) | 2009-04-15 |
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ID=38129599
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101690226A Expired - Fee Related CN100478198C (en) | 2005-12-08 | 2006-12-06 | Apparatus and method for alarming abnormality in tire air-pressure |
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| CN (1) | CN100478198C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111532090A (en) * | 2020-05-12 | 2020-08-14 | 格陆博科技有限公司 | A four-wheel indirect tire pressure detection method based on electric vehicle motor wheel speed |
-
2006
- 2006-12-06 CN CNB2006101690226A patent/CN100478198C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111532090A (en) * | 2020-05-12 | 2020-08-14 | 格陆博科技有限公司 | A four-wheel indirect tire pressure detection method based on electric vehicle motor wheel speed |
| CN111532090B (en) * | 2020-05-12 | 2022-06-17 | 格陆博科技有限公司 | Four-wheel indirect tire pressure detection method based on electric vehicle motor wheel speed |
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| Publication number | Publication date |
|---|---|
| CN100478198C (en) | 2009-04-15 |
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