CN104999865B - A kind of indirect type tire pressure monitoring method based on OBD interfaces - Google Patents
A kind of indirect type tire pressure monitoring method based on OBD interfaces Download PDFInfo
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- CN104999865B CN104999865B CN201510411457.6A CN201510411457A CN104999865B CN 104999865 B CN104999865 B CN 104999865B CN 201510411457 A CN201510411457 A CN 201510411457A CN 104999865 B CN104999865 B CN 104999865B
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Abstract
The invention discloses a kind of indirect type tire pressure monitoring method based on OBD interfaces, comprise the following steps：1）Initialized according to the state of vehicle；2）Data acquisition：Data/address bus is accessed from the OBD interfaces of Current vehicle, gathers each vehicle wheel rotational speed data in the vehicle traveling successively；3）Data storage：2 groups of memories are set, the above-mentioned each vehicle wheel rotational speed data collected are synchronously stored using FIFO FIFOs mode respectively；4）Data calculate：The each group of vehicle wheel rotational speed data for gathering and storing are calculated with the average value of relative deviation and the rate of change of relative deviation of vehicle wheel rotational speed；5）Analysis judges：By the rate of change of the average value of revised relative deviation and relative deviation compared with safety standard value, if exceeding safety standard value, prompting is sent.The present invention is simple in construction, easy for installation, and it is easy to safeguard, cost is low, and former car hardware will not be impacted, and can exclude the interference of vehicle running state and vehicle oneself state to tire pressure monitoring precision.
Description
Technical field
The present invention relates to monitoring automobile tyre pressure technology, it is more particularly related to a kind of based on OBD interfaces
Indirect type tire pressure monitoring method.
Background technology
With the popularization of automobile, the security in running car is increasingly subject to pay attention to stability.To the tire in traveling
Pressure is monitored, and can be avoided the traffic accident as caused by tire fault in time, be reduced the abrasion of suspension system, make driving more
It is economical.Monitoring tire pressure technology is broadly divided into two kinds of direct-type and indirect type.
Direct-type tire pressure monitoring technology is to utilize the gas for the pressure sensor direct measurement tire for being arranged on each wheel tyre cavity
Pressure, has higher precision, but because this method needs to spread out of pressure information using wireless launcher, to internal cell
Endurance requires high, and needs to be balanced tire calibration, and installation is complicated, and cost is high.
Current indirect type tire pressure monitoring technology is more using the wheel speed sensors of automobile ABS system come between comparative tire
Rotating speed difference.When tire pressure reduces, tire radius diminish, the rotating speed increase of corresponding tire.By reading each wheel wheel speed
Data are that may recognize that the tire to break down and carry out alarm.But this method needs the wiring directly from ABS, installation is again
It is miscellaneous, and easily former car ABS system is interfered, cause the serious safety problem of failure appearance of braking.
The content of the invention
It is an object of the invention to overcome the shortcomings of in existing tire pressure monitoring technology, there is provided between a kind of interface based on OBD
Connect formula tire pressure monitoring method.
A kind of indirect type tire pressure monitoring method based on OBD interfaces, comprises the following steps：
1) initialized according to the state of vehicle；
2) data acquisition：Data/address bus is accessed from the OBD interfaces of Current vehicle, is gathered successively each in the vehicle traveling
Vehicle wheel rotational speed data V1,V2..., Vi... Vn, i=1,2 ..., n, n is Current vehicle wheel number；
3) data storage：It is respectively k to set data volume1And k22 groups of memories, k1>k2, using FIFO FIFO sides
Formula is synchronous respectively to store k1、k2The above-mentioned each vehicle wheel rotational speed data collected of group；
4) data calculate：Average computation is carried out to each group of vehicle wheel rotational speed data for gathering and storing, obtains each group of data
The mean speed of middle n wheelCalculate i-th of vehicle wheel rotational speed V in each group of dataiTo mean speedIt is relatively inclined
DifferenceCalculate k1The average value of the relative deviation of i-th of vehicle wheel rotational speed in group dataAmendmentCalculate k2Group
The average value of the relative deviation of i-th of vehicle wheel rotational speed in dataAmendmentCalculate k2I-th of vehicle wheel rotational speed in group data
Relative deviation rate of change；
5) analysis judges：By k1The average value of the relative deviation of revised i-th of vehicle wheel rotational speed in group dataWith peace
Full standard value δ1Compare, ifIt is abnormal then to think that tire pressure occurs, sends prompting；By k2Revised i-th in group data
The average value of the relative deviation of vehicle wheel rotational speedWith safety standard value δ2Compare, ifIt is abnormal then to think that tire pressure occurs,
Send prompting；By k2The rate of change of the relative deviation of i-th of vehicle wheel rotational speed in group dataWith safety standard value δ3、δ4Compare,
IfThen think that tire pressure has slow downward trend, send prompting；IfThen think that tire pressure has rapid decrease to become
Gesture, send prompting.
The state according to vehicle is initialized as：When vehicle uses this method for the first time, start initialization program, adopt
Collect each vehicle wheel rotational speed data in vehicle traveling, the relative deviation of one group of each vehicle wheel rotational speed is calculated, by this group of relative deviation
Initial value as the relative deviation of each vehicle wheel rotational speed；Seriously change when state of wear occurs in vehicle, re-type or to wheel
During tire inflation change, be again started up initialization program, each vehicle wheel rotational speed data in collection vehicle traveling, be calculated one group it is each
The relative deviation of vehicle wheel rotational speed, the initial value using this group of relative deviation as the relative deviation of each vehicle wheel rotational speed.
The amendmentAmendmentFor：By the average value of the relative deviation of i-th of vehicle wheel rotational speedSubtract
The initial value of the relative deviation of this vehicle wheel rotational speed, obtain the average value of the relative deviation of revised i-th of vehicle wheel rotational speed
The safety standard value δ1It is worth for 0.25%, safety standard value δ2It is worth for 0.40%, safety standard value δ.3It is worth and is
0.02%, safety standard value δ4It is worth for 0.05%.
The data that vehicle is in special transport condition should be rejected in the data acquisition, data storage.
The special transport condition includes：Vehicle climb and fall, turn, jolt, skidding.
The prompting that exception occurs in the tire pressure, tire pressure has slow downward trend or tire pressure has rapid decrease trend to send prompting
Tactful different, including but not limited to indicator lamp lights or/and sent the prompting sound, and is transmitted by wired or wireless mode
Arrive other.
The present invention has the advantage that compared with prior art：
1) present invention directly obtains the data in the vehicle traveling from OBD interfaces, it is not necessary to external other sensors,
Simple in construction, easy for installation, it is easy to safeguard, cost is low, and former car hardware will not be impacted；
2) present invention can be directed to abnormal tyre pressure (including be slowly drop down to less than safety value and drop quickly to less than safety
Value), tire pressure there is slow downward trend and tire pressure to there are different situations in rapid decrease trend three to send different alarms, then make not
With processing；
3) present invention can exclude the interference of vehicle running state and vehicle oneself state to tire pressure monitoring precision；
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the indirect type tire pressure monitoring method based on OBD interfaces.
Embodiment
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, below will be with certain model four-wheel car
Exemplified by, embodiment of the present invention is described in detail with reference to accompanying drawing.
Indirect type tire pressure monitoring method based on OBD interfaces, comprises the following steps：
1) initialized according to the state of vehicle：When vehicle uses this method for the first time, start initialization program, collecting vehicle
Each vehicle wheel rotational speed data in traveling, are calculated the relative deviation of one group of each vehicle wheel rotational speed, using this group of relative deviation as
The initial value of the relative deviation of each vehicle wheel rotational speed；Seriously change when state of wear occurs in vehicle, re-type or filled to tire
When gas changes, initialization program is again started up, each vehicle wheel rotational speed data in collection vehicle traveling, one group of each wheel is calculated
The relative deviation of rotating speed, the initial value using this group of relative deviation as the relative deviation of each vehicle wheel rotational speed；Chosen in the present embodiment
Car initialized after obtain following initial value：
| Wheel | The near front wheel 1 | Off-front wheel 2 | Left rear wheel 3 | Off hind wheel 4 |
| Initial value | 0.04% | - 0.06% | 0.03% | 0.01% |
2) data acquisition：Data/address bus is accessed from the OBD interfaces of Current vehicle, gathers the sedan-chair chosen in the present embodiment successively
Four vehicle wheel rotational speed data V in car traveling1,V2,V3,V4；
3) data storage：It is that can store 2 groups of memories of the data collected in 120s, 20s to set data volume, is used
FIFO FIFOs mode synchronously stores the four vehicle wheel rotational speed data collected in 120s, 20s respectively；The number for gathering and storing
In, the data in the special transport conditions such as rejecting vehicle is in climb and fall, turns, jolts, skidding.
4) data calculate：Average computation is carried out to each group of vehicle wheel rotational speed data for gathering and storing, obtains each group of data
In four wheels mean speedCalculate i-th of vehicle wheel rotational speed V in each group of dataiTo mean speedIt is relative
DeviationCalculate the average value of the relative deviation of i-th of vehicle wheel rotational speed in the data in 120sThis is averaged
Value subtracts the initial value of the relative deviation of this vehicle wheel rotational speed, and the relative deviation for obtaining revised i-th of vehicle wheel rotational speed is averaged
ValueCalculate the average value of the relative deviation of i-th of vehicle wheel rotational speed in the data in 20sThis average value is subtracted this
The initial value of the relative deviation of vehicle wheel rotational speed, obtain the average value of the relative deviation of revised i-th of vehicle wheel rotational speedMeter
Calculate the rate of change δ of the relative deviation of i-th of vehicle wheel rotational speed in the data in 20si,20s'；The car chosen in the present embodiment is carried out
Data obtain following data after calculating：
5) analysis judges：By the average value of the relative deviation of revised i-th of vehicle wheel rotational speed in the data in 120sWith safety standard value δ1Compare, ifIt is abnormal then to think that tire pressure occurs, sends prompting；By in the data in 20s
The average value of the relative deviation of revised i-th of vehicle wheel rotational speedWith safety standard value δ2Compare, ifThen recognize
There is exception for tire pressure, send prompting；By the rate of change of the relative deviation of i-th of vehicle wheel rotational speed in the data in 20sWith
Safety standard value δ3、δ4Compare, ifThen think that tire pressure has slow downward trend, send prompting；IfThen
Think that tire pressure has rapid decrease trend, send prompting；The car chosen in the present embodiment is tied as follows after carrying out analysis judgement
Fruit：
There are slow downward trend or tire pressure to there is rapid decrease trend to send it is understood that abnormal, tire pressure occurs in tire pressure
The prompting strategy of prompting is different, and including but not limited to indicator lamp lights or/and sent the prompting sound, and by wired or wireless
Mode be transferred to other.
One of ordinary skill in the art will appreciate that program can be passed through by realizing all or part of step of above-described embodiment
Related hardware is instructed to complete, described program can be stored in embedded system.
Finally, it should also be noted that disclosed above is only the specific embodiment of the present invention, not limiting this hair
It is bright.All deformations that one of ordinary skill in the art directly can export or associate from present disclosure, all should recognize
To be protection scope of the present invention.
Claims (7)
- A kind of 1. indirect type tire pressure monitoring method based on OBD interfaces, it is characterised in that comprise the following steps：1) initialized according to the state of vehicle：When vehicle uses this method for the first time, start initialization program, collection vehicle row Each vehicle wheel rotational speed data in sailing, the relative deviation of one group of each vehicle wheel rotational speed is calculated, using this group of relative deviation as each car The initial value of the relative deviation of wheel speed；Seriously change when state of wear occurs in vehicle, re-type or give tyre inflating become During change, initialization program is again started up, each vehicle wheel rotational speed data in collection vehicle traveling, one group of each vehicle wheel rotational speed is calculated Relative deviation, the initial value using this group of relative deviation as the relative deviation of each vehicle wheel rotational speed；2) data acquisition：Data/address bus is accessed from the OBD interfaces of Current vehicle, gathers each wheel in the vehicle traveling successively Rotary speed data V1,V2..., Vi... Vn, i=1,2 ..., n, n is Current vehicle wheel number；3) data storage：It is respectively k to set data volume1And k22 groups of memories, k1>k2, distinguished using FIFO FIFO modes Synchronous storage k1、k2The above-mentioned each vehicle wheel rotational speed data collected of group；4) data calculate：Average computation is carried out to each group of vehicle wheel rotational speed data for gathering and storing, obtains in each group of data n The mean speed of wheelCalculate i-th of vehicle wheel rotational speed V in each group of dataiTo mean speedRelative deviationCalculate k1The average value of the relative deviation of i-th of vehicle wheel rotational speed in group dataAmendmentCalculate k2Group number The average value of the relative deviation of i-th of vehicle wheel rotational speed inAmendmentCalculate k2I-th vehicle wheel rotational speed in group data The rate of change of relative deviation5) analysis judges：By k1The average value of the relative deviation of revised i-th of vehicle wheel rotational speed in group dataWith safety post Quasi- value δ1Compare, ifIt is abnormal then to think that tire pressure occurs, sends prompting；By k2Revised i-th of wheel in group data The average value of the relative deviation of rotating speedWith safety standard value δ2Compare, ifIt is abnormal then to think that tire pressure occurs, sends Remind；By k2The rate of change of the relative deviation of i-th of vehicle wheel rotational speed in group dataWith safety standard value δ3、δ4Compare, ifThen think that tire pressure has slow downward trend, send prompting；IfThen think that tire pressure has rapid decrease to become Gesture, send prompting.
- 2. the indirect type tire pressure monitoring method according to claim 1 based on OBD interfaces, its featureIt is the amendmentAmendmentFor：By the average value of the relative deviation of i-th of vehicle wheel rotational speedSubtract The initial value of the relative deviation of this vehicle wheel rotational speed, obtain the average value of the relative deviation of revised i-th of vehicle wheel rotational speed
- 3. the indirect type tire pressure monitoring method according to claim 1 based on OBD interfaces, it is characterised in that the safety post Quasi- value δ1It is worth for 0.25%, safety standard value δ2It is worth for 0.40%, safety standard value δ3It is worth for 0.02%, safety standard value δ4Value For 0.05%.
- 4. the indirect type tire pressure monitoring method according to claim 1 based on OBD interfaces, it is characterised in that the data are adopted The data that vehicle is in special transport condition should be rejected in collection, data storage.
- 5. the indirect type tire pressure monitoring method according to claim 4 based on OBD interfaces, it is characterised in that the particular row The state of sailing includes：Vehicle climb and fall, turn, jolt, skidding.
- 6. the indirect type tire pressure monitoring method according to claim 1 based on OBD interfaces, it is characterised in that the tire pressure goes out Now abnormal, tire pressure has a slow downward trend or tire pressure have rapid decrease trend send prompting prompting strategy it is different.
- 7. the indirect type tire pressure monitoring method according to claim 6 based on OBD interfaces, it is characterised in that the prompting plan Slightly indicator lamp lights or/and sent the prompting sound.
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| CN105644279B (en) * | 2016-03-24 | 2019-02-15 | 邹红斌 | Tire pressure detection method and device |
| CN105818618B (en) * | 2016-03-24 | 2019-02-15 | 邹红斌 | Tire pressure detection method and device |
| CN105835634B (en) * | 2016-03-24 | 2018-05-18 | 邹红斌 | Tire pressure detection method, device and terminal |
| CN105691121A (en) * | 2016-04-01 | 2016-06-22 | 苏州车邦智能科技有限公司 | Tire pressure monitoring method and device based on OBD |
| CN106143497A (en) * | 2016-07-26 | 2016-11-23 | 成都之达科技有限公司 | Tire pressure monitoring method for computing data |
| CN106218329A (en) * | 2016-07-26 | 2016-12-14 | 成都之达科技有限公司 | Vehicle parameter acquisition method based on wireless senser |
| CN107554207B (en) * | 2017-09-01 | 2018-08-03 | 中睿宏智汽车技术（深圳）有限公司 | Interference judges and the method and apparatus of data processing |
| CN111247010B (en) * | 2017-10-09 | 2022-01-28 | 尼拉动力公司 | Determining tire change status in a vehicle |
| CN107941237A (en) * | 2017-12-14 | 2018-04-20 | 阜阳裕晟电子科技有限公司 | A kind of vehicle mileage computational methods |
| CN108454327B (en) * | 2018-01-26 | 2020-11-20 | 深圳市元征科技股份有限公司 | Tire pressure detection method, device and terminal |
| CN109177661A (en) * | 2018-08-27 | 2019-01-11 | 深圳市雪锐科技有限公司 | tire pressure monitoring method and device |
| CN112248726B (en) * | 2020-10-28 | 2022-02-08 | 深圳市道通科技股份有限公司 | Method and device for displaying function menu interface of automobile tire pressure monitoring system |
| CN113968105B (en) * | 2021-12-07 | 2023-06-20 | 中国第一汽车股份有限公司 | Tire pressure abnormality detection method, device, equipment and storage medium |
| CN114379294B (en) * | 2022-03-24 | 2022-06-14 | 深圳市其利天下技术开发有限公司 | OBD (on-Board diagnostics) combined type tire pressure monitoring method and system |
| CN115214272A (en) * | 2022-08-12 | 2022-10-21 | 中国第一汽车股份有限公司 | Tire pressure monitoring method, device, vehicle and storage medium |
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