CN102285306B - Method for preventing data collision of tire pressure monitor system (TPMS) transmitters - Google Patents

Method for preventing data collision of tire pressure monitor system (TPMS) transmitters Download PDF

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Publication number
CN102285306B
CN102285306B CN 201110179735 CN201110179735A CN102285306B CN 102285306 B CN102285306 B CN 102285306B CN 201110179735 CN201110179735 CN 201110179735 CN 201110179735 A CN201110179735 A CN 201110179735A CN 102285306 B CN102285306 B CN 102285306B
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China
Prior art keywords
data
tpms
projector
prevents
tpms projector
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Expired - Fee Related
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CN 201110179735
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CN102285306A (en
Inventor
刘均
易崇浪
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Shenzhen Launch Software Co Ltd
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Shenzhen Launch Software Co Ltd
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Priority to CN 201110179735 priority Critical patent/CN102285306B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
    • B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
    • B60C23/0433—Radio signals
    • B60C23/0447—Wheel or tyre mounted circuits
    • B60C23/0455—Transmission control of wireless signals
    • B60C23/0464—Transmission control of wireless signals to avoid signal interference

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mechanical Engineering (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Traffic Control Systems (AREA)

Abstract

The invention relates to a method for preventing data collision of tire pressure monitor system (TPMS) transmitters. The method comprises the following step that: for any TPMS transmitter, the transmission time Ti of the TPMS transmitter in the ith transmission period=TFIX+Bandwidth*pseudorandom natural number N, wherein I is a natural number, TFIX is fixed time, and Bandwidth is band width and the Bandwidth=the maximum of (transmission period-TFIX)/N. By the method for preventing the data collision of the tire pressure monitor system (TPMS) transmitters, the collision probability of a plurality of transmitters can be effectively prevented and controlled, and the requirement on data transmission reliability of a TPMS is met.

Description

The TPMS projector prevents the data collision method
Technical field
The present invention relates to the vehicle-mounted product technical field of vehicle electronics, relate in particular to a kind of TPMS projector and prevent the data collision method.
Background technology
TPMS (Tire Pressure Monitoring System) is Tire Pressure Monitoring System, be mainly used in the pressure and temperature of motor tire inside is carried out Real-Time Monitoring, and when the inside tires situation is unusual, report to the police, reminding driver avoids accident to occur.Existing TPMS system is divided into indirect type and two kinds of direct-type, the present invention relates to utilize the directly direct-type TPMS of measurement of pressure sensor.
As shown in Figure 1, it is direct-type TPMS system chart.Projector #1, projector #2, projector #3, projector #4 and projector #5 are installed in respectively different kinds of tyre (comprising spare tyre) inside, are used for measuring the data such as tire internal pressure, temperature.The observed reading of data is launched by RF-link (Radio Link), after the receiver module of central controller (ECU) receives wireless signal, and demodulation and the data such as pressure, temperature of reducing, and do the processing such as demonstration and abnormal alarm.
TPMS system shown in Figure 1 comprises a plurality of projectors such as projector #1, projector #2, projector #3, projector #4 and projector #5, the receiver module of publicly-owned ECU, use unified wireless channel, cause data to transmit the hidden danger of collision thereupon bringing because a plurality of projectors launch simultaneously.As shown in Figure 3, it causes data to transmit the scheme drawing of collision for a plurality of projectors while transmitting datas.Among Fig. 3, projector #1, projector #2 shown in time period transmitting data simultaneously, collision causes data to transmit unsuccessfully, need to resend data.
The prior art that prevents TPMS emitter data conflict/collision can be divided into simplex system and intercommunication system.As shown in Figure 2, it is for preventing the TPMS projector intercommunication system of data collision in the prior art.The emission of projector #1, projector #2, projector #3, projector #4 and projector #5 is by central controller (ECU) unified management, and central controller is provided with a plurality of LF projectors, and each projector is provided with corresponding LF receptor, and managing signaling is passed on by reverse LF channel.Although system shown in Figure 2 has solved the problem of data collision, bring the inconveniences such as cost rises, vehicle installation difficulty.
For unidirectional TPMS communication system shown in Figure 1, main by reaching the purpose of avoiding a conflict the launch time of adjusting projector in the prior art, although this technology does not increase hardware and cost of installation, flexible, this technology is perfect not, can not avoid conflict fully/collision problem.
Summary of the invention
Therefore, the present invention is conceived to prevent that a plurality of TPMS projectors from launching the event that leads to a conflict/collide simultaneously, improves the reliability of TPMS system wireless link data transmission.
For achieving the above object, the invention provides a kind of TPMS projector and prevent the data collision method, comprising:
For arbitrary TPMS projector, it is at the T launch time in i emission cycle i=T FIX+ Bandwidth * pseudorandom natural number N, wherein i is natural number, T FIXBe the set time, Bandwidth is gap width, Bandwidth=(emission cycle-T FIXThe maxim of)/N.
Wherein, described T FIXBe 1/2 of the emission cycle.
Wherein, described pseudorandom natural number N is generated by the 8bit pseudorandom number generator.
Wherein, utilize ID that the TPMS projector carries as the seed of described 8bit pseudo random number.
Wherein, described TPMS projector adopts the Manchester coding to send data.
Wherein, described TPMS projector transmission data rate is 9.6kbps.
Wherein, the data that described TPMS projector is launched are divided into long frame and short frame,
Wherein, growing frame format is:
Preamble code ID Data bit Check bit Finish (EOM)
Wherein, lacking frame format is:
Preamble code ID Check bit Finish
Wherein, the emission maximum holding time during described TPMS projector transmitting data is corresponding to the time of its emission long frame data.
Wherein, the emission of the minimum during described TPMS projector transmitting data holding time is corresponding to the time of its emission short frame data.
Wherein, described gap width Bandwidth should be far longer than the emission maximum holding time.
TPMS projector of the present invention prevents that the data collision method from can effectively prevent and control a plurality of projector collision probabilities, satisfies the reliability requirement of TPMS system data transmission.
Description of drawings
Below in conjunction with accompanying drawing, by the specific embodiment of the present invention is described in detail, will make technical scheme of the present invention and other beneficial effects apparent.
In the accompanying drawing,
Fig. 1 is direct-type TPMS system chart;
Fig. 2 is the TPMS projector intercommunication system that prevents data collision in the prior art;
Fig. 3 is that a plurality of projectors while transmitting datas cause data to transmit the scheme drawing of collision;
Fig. 4 is the principle schematic that TPMS projector of the present invention prevents the data collision method;
Fig. 5 is the scheme drawing of the applied 8bit pseudorandom number generator of a preferred embodiment of the present invention;
Fig. 6 is the data collision safe spacing scheme drawing that TPMS projector of the present invention prevents the data collision method.
The specific embodiment
Referring to Fig. 4, it prevents the principle schematic of data collision method for TPMS projector of the present invention.For reaching the final Transmission Time Interval T that dynamically adjusts iPurpose, need to reduce to launch holding time T TX, reasonable distribution emission duration T i(T i=T FIX+ T RAN), adjust at random dynamically random time T RAN, and think over emission holding time T TXThe front and back safe spacing.Continuous ruling partly represents Bandwidth among Fig. 4, according to the random value of pseudorandom natural number N, T RANObtain corresponding value.
T RAN=Bandwidth * pseudorandom natural number N, for arbitrary TPMS projector, it is at the T launch time in i emission cycle i=T FIX+ Bandwidth * pseudorandom natural number N, wherein i is natural number, T FIXBe the set time, Bandwidth is gap width, Bandwidth=(emission cycle-T FIXThe maxim of)/N.
For shortening the Frame send, and then reduce to launch holding time T TX, the present invention adopts the data mode of length frame combination.The sorting out value that data resource has, the cell pressure of the ID of tire, force value, temperature value, inner acceleration/accel and internal emission module.The foundation of ordering is: the ID of tire is the part that must comprise in each Frame, has the highest value; Level that pressure P, temperature T are that All factors being equal, preference will be give to, but must guarantee that data just have meaning in the correct situation of ID; The criterion of (tire) acceleration/accel transmitting data as whether not necessarily consists of transmit data frames; Cell pressure V launched once every the set time, and in the whole system life cycle, this ratio data is very little, is defined as the minimum magnitude of value.
Long frame format is:
Preamble code ID Data bit Check bit Finish (EOM)
Preamble code (synchronous code): 1 byte, can be by the 6bit start bit, the data mode position of 2bit.
For example: 00: nothing;
01: pressure;
10: pressure+temperature;
11: pressure+temperature+voltage.
ID：3byte。
Data are: 1～3byte (P/T/V).
Effect position: 1byte.
Stop bit: 2bit or nothing.
Substantially long word joint number is: 1+3+3+1=8byte.
Short frame format is:
Preamble code ID Check bit Finish
The data normal condition, unchanged.
The shortest frame byte number is: 1+3+1=5byte.
Introduce the length frame, if purpose is to shorten Frame. the variable quantity that the parameters such as P, T, V record can not pass concrete numerical value less than preset range.
The TPMS projector sends data rate can adopt 9.6kbps, adopts the Manchester coding.
Each Manchesterbit departure time is 1/9.6K=0.1ms, and every data b it departure time is 0.2ms.
Maximum duration is: 8x8x0.2=12.8ms, namely launch the holding time maxim.
Shortest time is: 5x8x0.2=8ms, namely launch the holding time minimum value.
T i=T FIX+ T RAN, T iIt is the launch time in i emission cycle, because emission cycle and T FIXImmobilize, therefore need reasonable distribution T RANWith T FIXThe TPMS system need to consider measures real-time and system's power consumption balance, tire static/low speed/fast state under the TPMS projector the different emission cycles is all arranged.The present invention was illustrated as 1 minute (60 seconds) as example take the emission cycle, can select T FIX=30 seconds=1/2 emission cycle, at this moment T RANMaxim is 30 seconds, and namely Bandwidth * pseudorandom natural number N maxim is 30 seconds.
Pseudorandom natural number N can adopt by the 8bit pseudorandom number generator and generate.As shown in Figure 5, it is the scheme drawing of the applied 8bit pseudorandom number generator of a preferred embodiment of the present invention, and this 8bit pseudorandom number generator adopts example, in hardware, is the linear feedback shift register form.This part is embedded in the MCU kernel of TPMS projector, can accomplish that an instruction cycle produces a new 8bit pseudo random number.Can utilize the ID of the unduplicated 4byte length that the TPMS projector carries as the seed of above-mentioned pseudo random number, so that each projector pseudo random number reduces the degree of association between mutually.
As shown in Figure 6, it prevents the data collision safe spacing scheme drawing of data collision method for TPMS projector of the present invention.Consider that the emission holding time is approximately about 10ms (emission holding time maxim is 12.8ms), 10mS is safe spacing before and after each emission. other projectors must not take.Corresponding to T RANMaxim=30 second, its ratio is RATE=30 * 1000/10=3000.Adopt the 8bit pseudo random number. then each gap width is calculated as follows: Bandwidth=(30S/255) * 1000=117ms, obvious Bandwith＞＞12.8ms (emission holding time maxim).
After using TPMS projector of the present invention and preventing the data collision method, with the practical collision probability computation model of its substitution TPMS projector, take 5 tires of manned vehicle TPMS system as example, collision probability is calculated as follows:
P = 1 - ( A 2 8 N ( 2 8 ) N * T TX / Bandwidth ) ( N = 5 )
P＝0.00423＝0.423％
TPMS system wireless link BER (bit error ratio) General Requirements is about 1～3%, and obviously collision probability 0.4% of the present invention can guarantee system requirements.
Therefore, adopt method as herein described, can effectively prevent and control a plurality of projector collision probabilities, satisfy the reliability requirement of TPMS system data transmission.The invention provides complete mechanism and the algorithm of a cover, the advantage of comprehensive prior art, fully excavate existing software and hardware resources, use the algorithms/mechanisms of a considerable amount of novelties, stagger to greatest extent emission intermittently, thus conflict/collision problem of avoiding data to transmit. guarantee the reliability of data transmission.
The above; for the person of ordinary skill of the art; can make other various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to the protection domain of the accompanying claim of the present invention.

Claims (10)

1. a TPMS projector prevents the data collision method, it is characterized in that, comprising:
For arbitrary TPMS projector, it is at the T launch time in i emission cycle i=T FIX+ Bandwidth * pseudorandom natural number N, wherein i is natural number, T FIXBe the set time, Bandwidth is gap width, Bandwidth=(emission cycle-T FIXThe maxim of)/N.
2. TPMS projector as claimed in claim 1 prevents the data collision method, it is characterized in that described T FIXBe 1/2 of the emission cycle.
3. TPMS projector as claimed in claim 1 prevents the data collision method, it is characterized in that, described pseudorandom natural number N is generated by the 8bit pseudorandom number generator.
4. TPMS projector as claimed in claim 3 prevents the data collision method, it is characterized in that, utilizes ID that the TPMS projector carries as the seed of described 8bit pseudo random number.
5. TPMS projector as claimed in claim 1 prevents the data collision method, it is characterized in that, described TPMS projector adopts the Manchester coding to send data.
6. TPMS projector as claimed in claim 5 prevents the data collision method, it is characterized in that, it is 9.6kbps that described TPMS projector sends data rate.
7. TPMS projector as claimed in claim 1 prevents the data collision method, it is characterized in that, the data that described TPMS projector is launched are divided into long frame and short frame,
Wherein, growing frame format is:
Preamble code ID Data bit Check bit Finish (EOM)
Wherein, lacking frame format is:
Preamble code ID Check bit Finish
。
8. TPMS projector as claimed in claim 7 prevents the data collision method, it is characterized in that, the emission maximum holding time during described TPMS projector transmitting data is corresponding to the time of its emission long frame data.
9. TPMS projector as claimed in claim 7 prevents the data collision method, it is characterized in that, the minimum emission holding time during described TPMS projector transmitting data is corresponding to the time of its emission short frame data.
10. TPMS projector as claimed in claim 8 prevents the data collision method, it is characterized in that, described gap width Bandwidth should be far longer than the emission maximum holding time.
CN 201110179735 2011-06-29 2011-06-29 Method for preventing data collision of tire pressure monitor system (TPMS) transmitters Expired - Fee Related CN102285306B (en)

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2719551B1 (en) * 2012-10-15 2015-06-24 Continental Automotive GmbH Method and system for monitoring a parameter of a tire of a vehicle
CN103342087B (en) * 2013-07-12 2015-08-05 山东省科学院自动化研究所 TPMS transmitter prevents caliberating device and the calibration method of data collision
DE102015226616A1 (en) * 2015-12-23 2017-06-29 Continental Automotive Gmbh Method and device for transmitting data from a wheel unit arranged on a wheel of a vehicle to a central unit of the vehicle
US11077727B2 (en) 2018-12-27 2021-08-03 Continental Automotive Systems, Inc. Vehicle TPMS security strategy
CN114518114A (en) * 2022-02-14 2022-05-20 上海埃威航空电子有限公司 Indoor space collaborative operation safety guarantee method and system

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Publication number Priority date Publication date Assignee Title
KR20010046952A (en) * 1999-11-16 2001-06-15 배동만 Anti-jamming method
CN1402484A (en) * 2001-08-10 2003-03-12 联想(北京)有限公司 Safety radio communication method
CN101425222A (en) * 2007-10-29 2009-05-06 环隆电气股份有限公司 Data emitting method
CN101932460A (en) * 2007-12-20 2010-12-29 倍耐力轮胎股份公司 Method and system for managing data transmission from a plurality of sensor devices included in a tyre

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010046952A (en) * 1999-11-16 2001-06-15 배동만 Anti-jamming method
CN1402484A (en) * 2001-08-10 2003-03-12 联想(北京)有限公司 Safety radio communication method
CN101425222A (en) * 2007-10-29 2009-05-06 环隆电气股份有限公司 Data emitting method
CN101932460A (en) * 2007-12-20 2010-12-29 倍耐力轮胎股份公司 Method and system for managing data transmission from a plurality of sensor devices included in a tyre

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