CN201525249U - Wireless tire pressure detector integrating dead-load calculation with suggested speed - Google Patents
Wireless tire pressure detector integrating dead-load calculation with suggested speed Download PDFInfo
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- CN201525249U CN201525249U CN2009202182278U CN200920218227U CN201525249U CN 201525249 U CN201525249 U CN 201525249U CN 2009202182278 U CN2009202182278 U CN 2009202182278U CN 200920218227 U CN200920218227 U CN 200920218227U CN 201525249 U CN201525249 U CN 201525249U
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- tire pressure
- load
- speed
- pressure
- tire
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Abstract
The utility model relates to a wireless tire pressure detector integrating dead-load calculation with suggested speed, belonging to the field of driving assistance in the automobile electronic industry. The wireless tire pressure detector comprises detection units mounted inside tires and a central control unit mounted in a driving cabin. Each detection unit consists of a sensor, a signal processor and a wireless transmitter. The central control unit consists of a wireless receiver, a signal processor, an LCD liquid crystal display screen and function selecting keys. The function selecting keys include load selecting keys and speed selecting keys. When a load key is pressed down, the detector can calculate current tire pressure, when the load key is pressed down again, the detector records tire pressure value and calculates tire pressure difference, and load can be obtained by multiplying the pressure difference by relative coefficients and then displayed by a liquid crystal screen. When a speed key is pressed down, the detector records a tire pressure value and then compares the tire pressure value to a specified four-gear pressure differential threshold value so as to provide a suggested driving speed, thereby realizing certain driving assistance function.
Description
Technical field
The utility model is a kind of wireless tire pressure detector that integrates load-carrying calculating and suggestion speed, belongs to the driver assistance field of Automobile Electronic Industry, the auxiliary calculating of the especially tire pressure detection of carrying out for safe driving, carload and suggestion moving velocity.
Background technology
Along with society and expanding economy, automobile has become people's go off daily and has used maximum vehicle.Safety traffic is the hope of each chaufeur.The factor that influences driving safety is very many, and pressure of tire is one of them factor.At present, obtained application in a lot of abroad high-grade car of radio tire pressure monitored control system (TPMS), domestic research is in the research and development stage.The principal feature of radio tire pressure monitored control system is to monitor the pressure of motor tire, at pressure during excessive or insufficient pressure in time to alarm driver, in order to avoid because of tyre explosion or under-voltage traffic accident takes place.Domestic and international existing wireless tire pressure detection system mainly is made up of detecting unit that is installed in inside tires and the Central Processing Unit (CPU) that is installed in driving compartment.Detecting unit mainly comprises pressure sensor, temperature sensor, signal processor and wireless launcher; Central Processing Unit (CPU) mainly comprises wireless receiver, signal processor and LED display alarm.Principle of work is: the pressure and temperature of tire is detected by the pressure and temperature detector respectively, is sent to signal processor after the A/D conversion, and signal processor sends data packing back to wireless launcher.Central Processing Unit (CPU) is at first judged the tire location that transmits after receiving signal, and then judges whether pressure and temperature has surpassed threshold value, just lights corresponding LED lamp warning if surpassed.
Yet the most of LED that adopts of existing radio tire pressure monitored control system comes to point out alarm message to seem that some is stiff to the driver, simultaneously, the function of these systems is single relatively, only realize the monitoring and the warning function of tire pressure and tire temperature, the pressure that does not make full use of tire carries out driver assistance function development such as carload and suggestion moving velocity.
The utility model content
The purpose of this utility model is to overcome existing wireless tire pressure detector and only has monitoring function and the stiff Presentation Function of LED to tire pressure, proposed a kind ofly to have tire pressure monitoring function, subsidiary load-carrying function and provide the method for calculating that the driver advises moving velocity, and utilized the LCD LCDs to show information such as tire pressure, load-carrying and suggestion moving velocity for the driver according to the smooth degree of ground-surface.
To achieve these goals, the utility model has been taked following technical scheme:
Hardware components of the present utility model comprises the detecting unit that is installed in each inside tires and is installed in the Central Processing Unit (CPU) composition of driving compartment.Detecting unit mainly is made up of pressure sensor, temperature sensor, signal processor and wireless launcher.Pressure sensor, temperature sensor are connected with signal processor respectively, and pressure signal and the temperature signal that measures passed to signal processor.Signal processor is launched by wireless launcher the intact back of signal conditioning with signal.Central Processing Unit (CPU) mainly is made up of wireless receiver, signal processor, function selecting key and LCD LCDs.Described function selecting key comprises load selection key (Load key) and speed selection key (Speed key).Wireless receiver, function selecting key and LCD LCDs are connected with signal processor respectively.Central Processing Unit (CPU) is at first by the wireless receiver received signal, and the tyre serial number of identification transmission signal information is judged tire location then.When load selection key was pressed, signal processor carried out the load-carrying computing and result of calculation is sent to the LCD LCDs showing, reports to the police when overload; When speed selection key was pressed, signal processor carried out the calculating of suggestion moving velocity, and result of calculation is sent the LCD LCDs showed.
When described load selection key is pressed, carload is assisted calculating, computation process is as follows:
At first measure the change value of pressure Δ F of four tires (be assumed to be four-wheel automobile, other is analogized) of the goods front and back of packing into
1, Δ F
2, Δ F
3, Δ F
4, then change value of pressure be multiply by corresponding weights W
1, W
2, W
3, W
4Obtain final cargo-carring cargo weight L, promptly
L＝W
1×ΔF
1+W
2×ΔF
2+W
3×ΔF
3+W
4×ΔF
4。
Wherein, weights W
1, W
2, W
3, W
4Be parameter to be calibrated, difference will be demarcated before use along with the difference of vehicle and tyre model for it, and calibration process is as follows:
1) power supply of open detection unit and Central Processing Unit (CPU) behind the installation hardware is started working it;
2) be respectively each tire and set a parameter W to be calibrated
1, W
2, W
3, W
4, each the tire pressure value Fb when record is unloaded
1, Fb
2, Fb
3, Fb
4
3) be M with quality
1The goods vehicle of packing into, and the force value Fl of record each tire this moment
11, Fl
21, Fl
31, Fl
41The load-carrying of this moment can be by formula
(W
1* (Fl
11-Fb
1)+W
2* (Fl
21-Fb
2)+W
3* (Fl
31-Fb
3)+W
4* (Fl
41-Fb
4))/4=M
1Calculate.
4) be M with the quality of packing in the step 3)
1Goods unload, and then be M with quality
2Goods pack into vehicle and repeat the 3rd the step, obtain formula
(W
1×(Fl
12-Fb
1)+W
2×(Fl
22-Fb
2)+W
3×(Fl
32-Fb
3)+W
4×(Fl
42-Fb
4))/4＝M
2，
5) repeating step 3), be M with quality respectively
3, M
4The goods vehicle of packing into, and obtain the load-gauge formula of this moment according to the formula in the step 3);
6) solve one group of W from these four calculating formulas of step 3)～step 5)
1, W
2, W
3, W
4Value;
7) repeating step 3)～step 6) 3 times, can solve 3 groups of W again
1, W
2, W
3, W
4Value, will obtain 4 groups of W at last
1, W
2, W
3, W
4Value is averaged to each weights respectively, and this aviation value is the W that finally obtains
1, W
2, W
3, W
4Calibration value.
When described speed selection key is pressed, suggestion speed is assisted calculating, computation process is as follows:
At first different ground-surface tire pressure threshold parameters are demarcated, and the pressure threshold that demarcation obtains is stored in the Central Processing Unit (CPU), in vehicle traveling process, when speed selection key was pressed, Central Processing Unit (CPU) was according to the given suggestion moving velocity of change value of pressure of track situation and each tire;
As follows to the travel calibration process of ground-surface tire pressure threshold value of difference:
1) power supply of open detection unit and Central Processing Unit (CPU) is started working it;
2) on first kind of road surface (as dark-coloured pavement), at the uniform velocity travel 100 meters with the speed of 80-120km/h, in the process of moving, write down the maximum pressure value and the minimum pressure values of each tire, calculate the pressure reduction between maximum pressure value and the minimum pressure values then; With 100 meters be the interval, keep moving velocity constant, continue again 3 times to overtake, and calculate the maximum pressure value of each tire and the difference between the minimum pressure values; Each tire all obtains pressure difference 4 times like this, then 4 pressure differences of each tire is averaged respectively, and 4 aviation values that obtain are the pressure threshold κ of conduct four tires on first kind of road surface respectively
11, κ
12, κ
13, κ
14
3) with running car on second kind of road surface (as coated chipping), at the uniform velocity travel repeating step 2 with the speed of 60-80km/h (km/hour)), obtain the threshold parameter κ of four tires on second kind of road surface
21, κ
22, κ
23, κ
24
4) with running car on the third road surface (as gravel road surface), at the uniform velocity travel repeating step 2 with the speed of 40-60km/h), obtain the threshold parameter κ of four tires on the third road surface
31, κ
32, κ
33, κ
34
5) with running car on the 4th kind of road surface (as the sandy soil road surface), at the uniform velocity travel repeating step 2 with the speed of 20-40km/h), obtain the threshold parameter κ of four tires on the 4th kind of road surface
41, κ
42, κ
43, κ
44
In the process of moving, Central Processing Unit (CPU) receives in real time transmitting of each detecting unit of being installed in inside tires, obtain four tires in certain period (as one minute) in the process of moving maximum pressure value and the pressure difference value Δ N between the minimum pressure values
1, Δ N
2, Δ N
3, Δ N
4, when speed selection key is pressed, be calculated as follows
The γ that following formula calculates
1, γ
2, γ
3, γ
4In cooresponding that group threshold parameter of minimum value as and the immediate threshold parameter in present vehicle ' road surface, then with this group threshold value cooresponding speed as the suggestion moving velocity.
Treating process of the present utility model is as follows:
The radiating portion of detecting unit carries out the A/D conversion to the signal that collects then at first with I/O mouth and wireless launcher initialization, after conversion finishes the signal data that collects is put into assigned address.The numbering that wireless launcher takes out the data in the assigned address and adds own tire is packed to data, and with certain frequency data transmission is gone out.When plural wireless launcher is launched data simultaneously, adopt the method for difference of injection time, promptly the 1st time gap with 1s outwards sends data, and the 2nd time gap with 1.5s outwards sends data, by that analogy.
The receiving unit of Central Processing Unit (CPU) judges then at first with I/O mouth and wireless launcher initialization whether the Load key is pressed, and carries out load-carrying calculating if press, and calculates current average tire pressure and demonstration earlier.When the Load key is pressed once more, write down the tire pressure value once more, and it is poor to calculate tire pressure, then difference of pressure is multiply by corresponding coefficient and obtain load-carrying and demonstration.Judge again whether the Speed key is pressed, if calculate by the next suggestion moving velocity that carries out.If above two keys are not all pressed, then carry out real-time tire pressure monitoring.When tire pressure monitoring, the wireless receiver of Central Processing Unit (CPU) is monitored aerial signal, data packet is resolved and extract tire number, tire pressure, tire temperature after receiving data packet.If tire pressure tire temperature exceeds threshold value then display alarm, if within threshold value then show that tire pressure is normal.
Compare with existing detecting device, the utlity model has following advantage:
This detector can not only detect pressure of tire, can also calculate vehicle load and realize certain driver assistance function according to the variation of tire pressure to the chaufeur moving velocity of offering suggestions by pressure of tire is auxiliary, has improved driving safety.
Description of drawings
Fig. 1 system principle diagram of the present utility model;
Fig. 2 detection cell circuit schematic diagram of the present utility model;
Fig. 3 Central Processing Unit (CPU) schematic circuit diagram of the present utility model;
Fig. 4 software section diagram of circuit of the present utility model.
The specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
The detecting unit of inside tires and the Central Processing Unit (CPU) of driving compartment at first are installed.Detecting unit comprises pressure sensor, temperature sensor, signal processor and wireless launcher, pressure sensor, temperature sensor are connected with signal processor respectively, the pressure signal and the temperature signal that measure are passed to signal processor, and signal processor is launched signal by wireless launcher after with signal conditioning.Central Processing Unit (CPU) mainly is made up of wireless receiver, signal processor, function selecting key and LCD LCDs.Described function selecting key comprises load selection key (Load key) and speed selection key (Speed key).Wireless receiver, function selecting key and LCD LCDs are connected with signal processor respectively.Central Processing Unit (CPU) is at first by the wireless receiver received signal, and the tyre serial number of identification transmission signal information is judged tire location then.
For little, the actual requirements such as energy consumption is low, long service life of volume that reach the radio tire pressure detecting device, it is the signal processor of the 89LV51 micro controller system of 3.3V as detecting unit that present embodiment adopts operating voltage.Input voltage is+direct current signal of 5V, utilize 1117 voltage stabilizing chips change into+voltage of 3.3V gives 89LV51 micro controller system and wireless launcher PTR8000 power supply.
Wireless launcher PTR8000 links to each other with the 89LV51 micro controller system by pin 2,4,6,7,8 etc., the data port D0-D7 of A/D conversion chip ADC0809 links to each other with the P0.0-P0.7 of 89LV51 micro controller system, the D1-D8 of chip 74SL373 links to each other with the P0.0-P0.7 of 89LV51 micro controller system, and the CKA of chip 74LS93 links to each other with the ALE of 89LV51 micro controller system.The crystal oscillator of 89LV51 micro controller system is 12MHZ, and ALE pin output signal frequency is 2MHZ like this.The work clock of A/D conversion chip ADC0809 is about 1MH, so thereby link to each other with ADC0809 after utilizing counter chip 74LS93 with the frequency signal two divided-frequency on the ALE pin and obtain its work clock.Because the P0 pin of 89LV51 micro controller system is that data address is multiplexing, so utilize 74SL373 that data are latched.Real-time detection wheel tire pressure of pressure sensor and temperature sensor and temperature pass to ADC0809 with detected signal.The ECO pin sends high level behind the A/D end of conversion, and the 89LV51 micro controller system utilizes the P2.7 pin to come cycle detection ECO, the digital signal after just obtaining transforming by the P0 pin when receiving high level.Then, utilize wireless launcher PTR8000 to send, realize the collection and the transmission of information.The same with the signal processor of detecting unit, the signal processor of Central Processing Unit (CPU) also adopts the 89LV51 micro controller system, and its power supply mode is the same with detecting unit, and the input voltage of LCD LCDs is+5V.Wireless receiver PTR8000 links to each other with the 89LV51 micro controller system by pin 2,4,6,7,8 etc., and the LCD LCDs passes through logical gate chip 74LS00 and links to each other with the 89LV51 micro controller system, and the crystal oscillator of 89LV51 micro controller system is 12MHZ.The P1.7 of three buttons and 89LV51 micro controller system, P2.2, the P2.6 pin links to each other.The LCD LCDs is regulated brightness by a variable resistance.After wireless receiver PTR8000 receives information, pass to identification and processing that the 89LV51 micro controller system carries out information, the back of finishing dealing with shows by LCD LCDs realization information and reports to the police.
After hardware is finished, carry out parameter calibration.At first demarcate and be used for the weights W that carload calculates
1, W
2, W
3, W
4, calibration process is as follows:
1) power supply of open detection unit and Central Processing Unit (CPU) behind the installation hardware starts working it, each the tire pressure value Fb when record is unloaded
1, Fb
2, Fb
3, Fb
4
3) with quality be pack into the vehicle and the force value Fl of record each tire this moment of the goods of 100kg
11, Fl
21, Fl
31, Fl
41The load-carrying of this moment can be by formula
(W
1* (Fl
11-Fb
1)+W
2* (Fl
21-Fb
2)+W
3* (Fl
31-Fb
3)+W
4* (Fl
41-Fb
4))/4=100 calculates.
4) goods of packing in the step 3) being unloaded, is pack into vehicle and repeated for the 3rd step of the goods of 1000kg then with quality, calculates load carrying ability by following formula:
(W
1×(Fl
12-Fb
1)+W
2×(Fl
22-Fb
2)+W
3×(Fl
32-Fb
3)+W
4×(Fl
42-Fb
4))/4＝1000，
5) repeating step 3) with quality respectively the goods of 2000kg, the 5000kg vehicle of packing into, and obtain the load-gauge formula of this moment according to the formula in the step 3);
6) solve one group of W from these four calculating formulas of step 3)～step 5)
1, W
2, W
3, W
4Value;
7) vehicle of respectively goods of different quality being packed into again, repeating step 3)～and step 6) 3 times, solve 3 groups of W again
1, W
2, W
3, W
4Value, at last with the W in this 4 class value
1, W
2, W
3, W
4Average respectively, finally obtain W
1, W
2, W
3, W
4Calibration value.
When speed selection key was pressed, signal processor was to calculate suggestion speed as follows:
At first different ground-surface tire pressure threshold parameters are demarcated, and the pressure threshold that demarcation obtains is stored in the Central Processing Unit (CPU), in vehicle traveling process, when speed selection key was pressed, Central Processing Unit (CPU) was according to the given suggestion moving velocity of change value of pressure of track situation and each tire;
As follows to the travel calibration process of ground-surface tire pressure threshold value of difference:
1) power supply of open detection unit and Central Processing Unit (CPU) is started working it;
2) on dark-coloured pavement, at the uniform velocity travel 100 meters with the speed of 100km/h, in the process of moving, write down the maximum pressure value and the minimum pressure values of each tire, calculate the pressure reduction between maximum pressure value and the minimum pressure values then; With 100 meters be the interval, keep moving velocity constant, continue again 3 times to overtake, and calculate the maximum pressure value of each tire and the difference between the minimum pressure values; Each tire all obtains pressure difference 4 times like this, then 4 pressure differences of each tire is averaged respectively, and 4 aviation values that obtain are respectively as the pressure threshold κ at last four tires in first kind of road surface (dark-coloured pavement)
11, κ
12, κ
13, κ
14
3) with running car on coated chipping, at the uniform velocity travel repeating step 2 with the speed of 70km/h), obtain threshold parameter κ at last four tires in second kind of road surface (coated chipping)
21, κ
22, κ
23, κ
24
4) with running car on gravel road surface, at the uniform velocity travel repeating step 2 with the speed of 50km/h), obtain the threshold parameter κ of (gravel road surface) last four tires on the third road surface
31, κ
32, κ
33, κ
34
5) with running car on the sandy soil road surface, at the uniform velocity travel repeating step 2 with the speed of 30km/h), obtain threshold parameter κ at last four tires in the 4th kind of road surface (sandy soil road surface)
41, κ
42, κ
43, κ
44
After finishing above-mentioned hardware components and parameter calibration, software is downloaded.Detecting unit and Central Processing Unit (CPU) carry out the initialization of I/O mouth and wireless launcher, wireless receiver at first respectively behind the running software.Detecting unit carries out the A/D conversion to pressure and the temperature signal that collects after having disposed the parameter of wireless launcher, and the conversion tyre serial number that the back adds oneself that finishes is packed to data, and with certain frequency data transmission is gone out.When plural wireless launcher is launched data simultaneously, adopt the method for difference of injection time, promptly the 1st time gap with 1s outwards sends data, and the 2nd time gap with 1.5s outwards sends data, by that analogy.After the Central Processing Unit (CPU) initialization is finished, judge whether the Load key is pressed, carry out load-carrying calculating, calculate current average tire pressure and demonstration earlier if press.When the Load key is pressed once more, note down the tire pressure value once more, and calculate tire pressure difference Δ F
1, Δ F
2, Δ F
3, Δ F
4, then difference of pressure be multiply by corresponding weights coefficient W
1, W
2, W
3, W
4, obtain load-carrying: L=W
1* Δ F
1+ W
2* Δ F
2+ W
3* Δ F
3+ W
4* Δ F
4, and show.Central Processing Unit (CPU) obtains four tires maximum pressure value in the process of moving and the pressure difference value Δ N between the minimum pressure values according to the signal of the detecting unit emission that receives
1, Δ N
2, Δ N
3, Δ N
4, when speed selection key is pressed, be calculated as follows
From γ
1, γ
2, γ
3, γ
4In select minimum cooresponding that group threshold value as immediate threshold parameter, then with the cooresponding speed of this group threshold value as the suggestion moving velocity, and be presented at suggestion moving velocity under this road surface situation.If above two keys are not all pressed, then carry out real-time tire pressure monitoring.When tire pressure monitoring, the wireless receiver of Central Processing Unit (CPU) is monitored aerial signal, data packet is resolved and extract tire number, tire pressure, tire temperature after receiving data packet.If tire pressure tire temperature exceeds threshold value then display alarm, if within threshold value then show that tire pressure is normal.
Claims (1)
1. multifunction wireless tire pressure detector that integrates load-carrying calculating and suggestion speed, comprise the identical detecting unit and the Central Processing Unit (CPU) composition that is installed in driving compartment of structure that is installed in each inside tires, described detecting unit comprises pressure sensor, temperature sensor, signal processor and wireless launcher, and pressure sensor, temperature sensor and wireless launcher are connected with signal processor respectively; Described Central Processing Unit (CPU) comprises wireless receiver, signal processor and LCD LCDs, it is characterized in that: described Central Processing Unit (CPU) also comprises function selecting key, described function selecting key comprises load selection key and speed selection key, and wireless receiver, load selection key, speed selection key and LCD LCDs are connected with signal processor respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202182278U CN201525249U (en) | 2009-10-16 | 2009-10-16 | Wireless tire pressure detector integrating dead-load calculation with suggested speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202182278U CN201525249U (en) | 2009-10-16 | 2009-10-16 | Wireless tire pressure detector integrating dead-load calculation with suggested speed |
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| Publication Number | Publication Date |
|---|---|
| CN201525249U true CN201525249U (en) | 2010-07-14 |
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ID=42516546
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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Country Status (1)
| Country | Link |
|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108891211A (en) * | 2018-07-15 | 2018-11-27 | 合肥市智信汽车科技有限公司 | A kind of vehicle tyre early warning system and its application method |
| CN110831787A (en) * | 2017-06-26 | 2020-02-21 | 株式会社普利司通 | Tire pressure monitoring system, tire pressure monitoring method, tire pressure monitoring program, and vehicle |
-
2009
- 2009-10-16 CN CN2009202182278U patent/CN201525249U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110831787A (en) * | 2017-06-26 | 2020-02-21 | 株式会社普利司通 | Tire pressure monitoring system, tire pressure monitoring method, tire pressure monitoring program, and vehicle |
| CN108891211A (en) * | 2018-07-15 | 2018-11-27 | 合肥市智信汽车科技有限公司 | A kind of vehicle tyre early warning system and its application method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100714 Termination date: 20111016 |