CN101301846B - Automotive tire pressure monitoring system calibration instrument and calibration method - Google Patents
Automotive tire pressure monitoring system calibration instrument and calibration method Download PDFInfo
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- CN101301846B CN101301846B CN2008100640197A CN200810064019A CN101301846B CN 101301846 B CN101301846 B CN 101301846B CN 2008100640197 A CN2008100640197 A CN 2008100640197A CN 200810064019 A CN200810064019 A CN 200810064019A CN 101301846 B CN101301846 B CN 101301846B
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Abstract
The invention provides a pressure monitoring system marking instrument of an automobile tyre and a marking method thereof. The marking instrument includes two parts; one is a tyre pressure sensor and the other is a diagnosing marking device; the tyre sensor includes a central control module (2), a sensor (1), a RF transmitting circuit and a lower frequency receiving circuit; the tyre sensor is connected with the lower frequency receiving circuit and the central control module (2); the central control module (2) is connected with the RF transmitting circuit and the sensor (1); the marking instrument consists of an SCM, the lower frequency transmitting circuit, the RF receiving circuit, a human-computer interface and a communication interface; the SCM is connected with the lower frequency transmitting circuit; the tyre sensor is connected with the RF receiving circuit which is connected with the SCM; the SCM is connected with the human-computer interface and the communication interface. The invention can simply realize the diagnosing and the marking of the pressure monitoring system sensor of the tyre, is suitable for the automobile types of any collocation, is not interfered by the tyre pressure monitoring system on other automobiles and can not affect other automobiles.
Description
(1) technical field
The present invention relates to the monitoring automobile tyre pressure technology, be specifically related to a kind of automotive tire pressure monitoring system calibration instrument.
(2) background technology
At present, the transducer calibration of automobile tire pressure monitoring system, mainly adopt following 2 kinds of methods:
1. dispatching from the factory at the vehicle of using and standard is that disposable setting is finished, and the later stage is no longer changed also and can't change.
2. in system, add the low frequency wake-up passage, as shown in Figure 1.This calibration method needs special-purpose control module, need timing signal, send order and data by the low frequency wake-up coil to tire sensor by control module, tire sensor carries out respective handling after receiving and demarcating order, the result that processing finishes will demarcate by the radio-frequency channel back returns to control module, finishes the demarcation task thus.
3. the radio communication mode with tire sensor and control module changes the duplex communication mode into by simplex mode (only sending data by sensor to control module).Need timing signal, nominal data is delivered to tire sensor by LF communication side, control module in by the radio-frequency channel result being sent it back again after tire sensor is finished dealing with by control module.
The subject matter that these calibration methods exist is:
1. if, then be difficult to satisfy the requirement of different automobile types to monitoring tire pressure by Default Value.
2. nominal data need be input in the control module in advance.Its input mode or by the vehicle diagnostics interface, or design special input button and display interface, this will increase the design complexities and the cost of automobile tire pressure monitoring system.If adopt vehicle-mounted bus mode, this function is set in the time of also need formulating the exploitation of diagnostic norms and diagnostic equipment.
3. need in the system low frequency wake-up coil to be installed or to be changed the radio-frequency channel into the two way communication mode.The situation of after dispatching from the factory for vehicle automobile tire pressure monitoring system being installed again, it is bigger that low frequency wake-up coil difficulty is installed, and is difficult for realizing.
When control module when tire pressure sensor send to be demarcated order, may exert an influence near other vehicle of depositing.Lead to errors and handle and response.
(3) summary of the invention
The object of the present invention is to provide a kind of diagnosis and demarcation that can simply realize the system for monitoring pressure in tyre sensor, be applicable to the vehicle of any configuration, and be not subjected to the interference of the system for monitoring pressure in tyre on other vehicle, do not influence the automotive tire pressure monitoring system calibration instrument of other vehicle yet.
System calibrating instrument of the present invention is achieved in that it comprises two parts, one is tire pressure sensor, two are the diagnosis calibration facility, tire sensor comprises Central Control Module (CCM) 2, sensor 1, radio-frequency transmissions circuit and low frequency acceptor circuit, tire sensor connects low frequency acceptor circuit and Central Control Module (CCM) 2, Central Control Module (CCM) 2 connects radio-frequency transmissions circuit and sensor 1, calibrating instrument comprises micro controller system, the low frequencies circuit, radio-frequency (RF) receiving circuit, man-machine interface and communication interface are formed, micro controller system connects the low frequencies circuit, tire sensor connects radio-frequency (RF) receiving circuit, radio-frequency (RF) receiving circuit connects micro controller system, and micro controller system connects man-machine interface and communication interface.
System calibrating instrument of the present invention also comprises some technical characterictics like this:
1, described low frequency acceptor circuit comprises antiresonant circuit and the comparator U1 that inductance L 1, resistance R 1, capacitor C 1 are formed;
2, described low frequencies circuit comprises inductance L 2, resistance R 2, capacitor C 2 composition series resonant circuits and reverse buffer amplifier U2;
3, described man-machine interface adopts 4x4 keyboard array and dot matrix lcd.
Micro controller system adopts the I/O scan mode that the state of keyboard array is scanned the button of being pressed with identification among the present invention.When starting calibration process, micro controller system calls data of database according to the vehicle model corresponding codes and is used to demarcate the monitoring tire pressure data, and content comprises: parameters such as tire pressure alarm threshold value, tyre temperature alarm threshold value, tire sensor battery alarm voltage threshold value and sensor alert frequency, maximum alarm times.After choosing nominal data, calibrating instrument starts the demarcation communication process automatically, and nominal data, software hatted code and the check information of choosing is sent to tire sensor by the LF communication mode.
As seen from Figure 2, adopt dual mode to communicate between tire sensor and the calibrating instrument, be respectively low frequency magnetic flux letter mode (abbreviation LF communication) and radio frequency electromagnetic signalling methods (abbreviation radio communication), wherein LF communication is used for calibrating instrument to tire sensor transmission nominal data and order, and radio communication is used for tire sensor and sends response message to calibrating instrument.By synthesizing of two kinds of one way communication modes, form the half-duplex operation of tire sensor and calibrating instrument.
Communication between tire sensor and the calibrating instrument has utilized the near-field effect of LF communication, is used to guarantee that demarcation order and data that calibrating instrument sends are not received by other tire module.By adding the software hatted code,, can prevent that the signal of other system for monitoring pressure in tyre from disturbing for tire sensor radio frequency output additional identification feature.
In calibrating instrument, set up the vehicle information storage.Can demarcate the setup parameter of its system for monitoring pressure in tyre sensor automatically according to vehicle.
Another object of the present invention is to provide a kind of method that pressure monitoring system of car tyre is demarcated, this procedure is as follows:
1. by man-machine interface data message to be calibrated is input in the calibrating instrument;
2. near the tire of demarcating, calibrating instrument is set;
3. start and demarcate communication process;
4. calibrating instrument sends to tire sensor by the low frequencies circuit and demarcates order and data;
5. tire sensor is received and is demarcated order and the laggard line data verification of data, and calibration result is sent to calibrating instrument by the radio-frequency transmissions circuit;
6. calibrating instrument is presented at it in man-machine interface after receiving response,
If be used for the vehicle demarcation of rolling off the production line, the diagnostic installation that then rolls off the production line inputs to nominal data in the calibrating instrument by communication interface, and calibrating instrument is demarcated the back according to identical method to sensor and by communication interface the result returned to the diagnostic installation that rolls off the production line.
Beneficial effect of the present invention has:
1. do not increase extra low frequency wake-up coil, can realize the inline diagnosis and the demarcation of tire pressure system, the parameter calibration when being convenient to vehicle the tire pressure system being installed after sale.
2. diagnosis and calibration process are not subjected to tire pressure system interference on other vehicle, the tire pressure system of other vehicle are not exerted an influence yet.
3. the diagnosis calibration facility is small-sized, hand-holdable, is not subjected to the restriction in environment and place.
4. the calibration facility consumption of current is low, can be battery-powered, need not externally fed.
5. according to the designing requirement of vehicle, can simply realize the diagnosis and the demarcation of system for monitoring pressure in tyre sensor.
6. satisfy host vehicle production off-line test and vehicle after sale to the diagnosis and the calibration request of system for monitoring pressure in tyre.
7. do not have installation of low frequency wake-up coil and change signalling methods problem, be applicable to the vehicle of any configuration.
(4) description of drawings
Fig. 1 is for realizing tire sensor calibration system constructional drawing by the low frequency wake-up passage;
Fig. 2 is a system architecture diagram of the present invention;
Fig. 3 is a tire sensor low frequency acceptor circuit scheme drawing of the present invention;
Fig. 4 is a diagnostic aid block diagram of the present invention;
Fig. 5 divides scheme drawing for the communication level;
Fig. 6-Fig. 7 is a signal encoding form scheme drawing, and wherein Fig. 6 is the regular coding form of heading, and Fig. 7 is the Manchester coded format of data.
Fig. 8 is the software flow pattern of tire sensor in calibration process.
Fig. 9 is the software flow pattern of marking apparatus in calibration process.
(5) specific embodiment
The present invention is further illustrated below in conjunction with accompanying drawing:
In conjunction with Fig. 1-Fig. 2, present embodiment comprises two parts, and one is tire pressure sensor; Two are the diagnosis calibration facility.Its constructional drawing is seen Fig. 2.Tire sensor comprises Central Control Module (CCM) 2, sensor 1, radio-frequency transmissions circuit and low frequency acceptor circuit.When tire sensor receives that by the low frequency acceptor circuit order is demarcated in diagnosis, send it to Central Control Module (CCM), Central Control Module (CCM) is resolved order, and according to the value of variable in the command context change internal storage, the back of finishing dealing with sends the result by the radio-frequency transmissions circuit.If diagnostic command is for reading tire parameter, after then the numerical value such as pressure, temperature, modular battery voltage that will work as front tyre by sensor 1 obtains, launch by radio circuit.Calibrating instrument comprises micro controller system, low frequencies circuit, radio-frequency (RF) receiving circuit, man-machine interface and communication interface composition.Diagnosing the timing signal user of service to select vehicle and tire location to be calibrated by man machine interface or communication interface, micro controller system is launched it by the low frequencies circuit after organizing and demarcating order and parameter.Tire sensor provides radio-frequency responsive, and calibrating instrument sends it to micro controller system after receiving this response by radio-frequency (RF) receiving circuit, and micro controller system is presented at it on man-machine interface or by communication interface and sends out.
Wherein, the concrete structure of low frequency acceptor circuit is seen Fig. 3, and the concrete structure of low frequencies circuit is seen Fig. 4.Inductance L 1 among Fig. 3, resistance R 1 and capacitor C 1 are combined into antiresonant circuit, and the resonance frequency is 125kHz, and the inductance L 2 among Fig. 4, resistance R 2 and capacitor C 2 are formed series resonant circuit, and the resonance frequency also is 125kHz.
In the present embodiment, the functional block diagram of calibrating instrument as shown in Figure 4, man-machine interface adopts 4x4 keyboard array U3 and dot matrix lcd U4 to realize among the figure.Micro controller system U5 adopts the I/O scan mode that the state of keyboard array is scanned the button of being pressed with identification.When starting calibration process, micro controller system calls data of database according to the vehicle model corresponding codes and is used to demarcate the monitoring tire pressure data, and content comprises: parameters such as tire pressure alarm threshold value, tyre temperature alarm threshold value, tire sensor battery alarm voltage threshold value and sensor alert frequency, maximum alarm times.After choosing nominal data, calibrating instrument starts the demarcation communication process automatically, and nominal data, software hatted code and the check information of choosing is sent to tire sensor by the LF communication mode.
The software hatted code is used to guarantee the reliability of conversation sessions.In force, adopt 16 bit lengths, calculate by the system time of calibration facility.Tire sensor returns this data to demarcating order when responding, calibrating instrument just can go out the validity of tire sensor response by this data identification like this.
It is the Checksum verification and the mode of 8 bits that the nominal data amount adopts the verification word length, or the CRC-16 verification mode realizes.
After tire sensor is received nominal data, at first the validity of data is checked by Checksum algorithm or CRC-16 algorithm, if data are effective, then nominal data are stored in the internal storage, and send the demarcation successful respond by the radio communication interface; If data are invalid, then abandon the data of being received, and demarcate failure by the radio frequency interface transmission and reply.As mentioned before, tire sensor except demarcating status information, also comprises the software received sign indicating number and check word immediately in the Frame when carrying out being with.
Calibrating instrument sends to be demarcated after the order, prepares the demarcation of reception tire sensor and replys.After receiving replying that tire sensor sends by radio communication, calibrating instrument is at first checked data validity, the content of checking comprises the inspection of the cross-check sum software hatted code of check word, if inspection is failed then abandoned these frame data and continue wait acknowledge.In this implementation method, tire sensor receives to demarcate to order and makes the time of replying and be no more than 100ms, therefore if calibrating instrument waits for that reaching 100ms can't receive that still actv. replys then think receive time-out, demarcate failure, finish this time demarcation process.After calibration process finished, the result that calibrating instrument will be demarcated was presented on the Liquid Crystal Display (LCD).
It in the system calibrating function of realizing system for monitoring pressure in tyre, two kinds of signalling methodss of LF communication and radio communication have been designed, wherein, the radio communication mode adopts the radio-frequency module that adopted in the system for monitoring pressure in tyre normal use to realize, additive incrementation have only the LF communication part.
The sending end of LF communication adopts the mode of RLC serial resonance to realize, the receiving end of LF communication adopts the parallel resonance manner inductive spacing magnetic field of RLC.The realization of LF communication divides does four layers, is respectively Physical layer, link layer, communication layers and application layer (as shown in Figure 5).
1. Physical layer
LF communication adopts the carrier frequency of 125kHz, and promptly serial RLC transmission circuit and parallel RLC acceptor circuit all should be at 125kHz resonance.And for the communication distance that makes LF communication limits within the specific limits, guarantee that the signal that the timing signal calibrating instrument sends is not received by other tire pressure sensors, transmission circuit should adopt smaller horsepower output, can control horsepower output by the value of controlling resistance R2.When carrying out scheme implementation, adopt following electric parameter:
The electric parameter of table 1 embodiment
Implement according to the parameter shown in the table 1, no matter be the emission of serial resonance, still parallel resonance acceptor circuit, resonance point is all at 125kHz, by U2 output frequency among Fig. 4 is the square-wave signal of 125kHz, dutycycle 50%, can form the magnetic field of same frequency in the space, receiving end shown in Figure 5 is sensed behind the space magnetic field relatively playing two input ends of U1 and is formed the induction electricity dynamic formula, by exporting high level behind the U1.Receiving coil L1 and transmitter coil L2 have adopted 1 dimension coil mode, and this just requires when communication two coil axial lines parallel as far as possible, and angle should be greater than 30 °.Another preferable application example is that receiving coil L2 adopts 2 dimensions or 3 dimension canoes, has so just avoided the directivity of communication, uses convenient.But, adopt 2 dimensions or 3 dimension coils also can increase the size of tire sensor.
2. link layer
The ASK modulation is adopted in communication, promptly by the output of 125kHz resonance signal being arranged and not having resonance signal output and represent logic ' 1 ' and logic ' 0 ' respectively.
Coded system adopts two kinds, for heading, adopts the regular coding form; For communication data, adopt the Manchester coding, promptly represent data ' 1 ' by the positive rise of signal, falling edge represents that data ' 0 ' are (as Fig. 6-Fig. 7).
3. communication layers
Communication layers realizes the framing management of data, and data frame content comprises heading, and data and check word, heading are set form, shown in Fig. 7-1.At one preferably in the embodiment, verification can adopt the Checksum verification and mode, if, also can adopt the embodiment of CRC16 verification to the having relatively high expectations of data communication reliability.
Add the software hatted code in communication layers, every transmission one frame data all produce the hatted code of one 16 bit length at random and together send, tire sensor returns this sign indicating number immediately when carrying out radio frequency output, just demarcate like this and can prevent that the signal of other system for monitoring pressure in tyre from disturbing by the validity of its data discrimination.Ma generation immediately can adopt the system time of diagnostic aid to realize.
4. application layer
Application layer data is specifically defined by the different application of software, in calibration system, can be content-defined by what demarcate, it comprises: the cycle of operations of tire pressure alarm threshold value, tyre temperature alarm threshold value, sensor, the transmission number of times of Frame and software be sign indicating number or the like immediately.
Claims (5)
1. automotive tire pressure monitoring system calibration instrument, it comprises two parts, one is tire pressure sensor, two is calibrating instrument, it is characterized in that tire pressure sensor comprises Central Control Module (CCM), sensor, radio-frequency transmissions circuit and low frequency acceptor circuit, sensor connects Central Control Module (CCM), Central Control Module (CCM) connects radio-frequency transmissions circuit and low frequency acceptor circuit, calibrating instrument comprises micro controller system, the low frequencies circuit, radio-frequency (RF) receiving circuit, man-machine interface and communication interface are formed, micro controller system connects the low frequencies circuit, radio-frequency (RF) receiving circuit connects micro controller system, and micro controller system connects man-machine interface and communication interface; Wherein, radio-frequency transmissions circuit in the tire pressure sensor is connected with radio-frequency (RF) receiving circuit in the calibrating instrument by the radio frequency electromagnetic signalling methods, and the low frequency acceptor circuit in the tire pressure sensor passes through the low frequency magnetic flux and believes that mode is connected with low frequencies circuit in the calibrating instrument.
2. automotive tire pressure monitoring system calibration instrument according to claim 1 is characterized in that described low frequency acceptor circuit comprises antiresonant circuit and comparator U1 that inductance L 1, resistance R 1, capacitor C 1 are formed.
3. automotive tire pressure monitoring system calibration instrument according to claim 1 is characterized in that described low frequencies circuit comprises inductance L 2, resistance R 2, capacitor C 2 composition series resonant circuits and reverse buffer amplifier U2.
4. automotive tire pressure monitoring system calibration instrument according to claim 1 is characterized in that described man-machine interface adopts 4x4 keyboard array and dot matrix lcd.
5. an automobile tire pressure monitoring system calibration method is characterized in that it comprises the steps:
1.1, by man-machine interface data message to be calibrated is input in the calibrating instrument;
1.2, near the tire of demarcating, calibrating instrument is set;
1.3, start to demarcate communication process;
1.4, calibrating instrument send to demarcate order and data by the low frequencies circuit to tire sensor;
1.5, tire sensor receives and demarcates order and the laggard line data verification of data, and calibration result is sent to calibrating instrument by the radio-frequency transmissions circuit;
1.6, calibrating instrument is presented at it in man-machine interface after receiving response.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100640197A CN101301846B (en) | 2008-02-22 | 2008-02-22 | Automotive tire pressure monitoring system calibration instrument and calibration method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100640197A CN101301846B (en) | 2008-02-22 | 2008-02-22 | Automotive tire pressure monitoring system calibration instrument and calibration method |
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| CN101301846A CN101301846A (en) | 2008-11-12 |
| CN101301846B true CN101301846B (en) | 2011-06-22 |
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101734115B (en) * | 2008-11-25 | 2011-07-20 | 联创汽车电子有限公司 | Alarm management method of vehicle tyre pressure monitoring system |
| CN101837714B (en) * | 2010-03-31 | 2015-01-21 | 深圳市元征软件开发有限公司 | Tire pressure monitoring system with dual-polarization antenna and method for receiving and processing signal thereof |
| CN102529605B (en) * | 2010-12-17 | 2014-06-18 | 橙的电子股份有限公司 | Wireless tire pressure sensor and standard pressure setting method |
| CN102555697A (en) * | 2010-12-17 | 2012-07-11 | 联创汽车电子有限公司 | Method of positioning tire pressure sensors in automobile tire air pressure monitoring system |
| CN102673326B (en) * | 2011-03-18 | 2016-01-20 | 上海保隆汽车科技股份有限公司 | One way communication tire pressure monitoring system |
| CN102358114A (en) * | 2011-09-08 | 2012-02-22 | 许道胜 | Vehicle-used inner tire, tire pressure monitoring system, and device thereof |
| CN102555699B (en) * | 2012-03-13 | 2013-10-30 | 山东省科学院自动化研究所 | Calibration device and calibration method for emitter in direct tire pressure monitoring system |
| CN104476988B (en) * | 2014-11-11 | 2017-01-25 | 中国电子科技集团公司第三十八研究所 | Portable tire pressure sensor wireless diagnostic device |
| CN105667227B (en) * | 2016-01-04 | 2018-03-23 | 合肥晟泰克汽车电子股份有限公司 | Wheel detector calibration system and its control method |
| CN108020373A (en) * | 2017-11-22 | 2018-05-11 | 广东菲柯特电子科技有限公司 | Tire pressure sensor simulation device |
| CN108663222A (en) * | 2018-02-08 | 2018-10-16 | 南京依维柯汽车有限公司 | The scaling method of tire pressure alarm system suitable for commercial car |
| CN108790627A (en) * | 2018-06-04 | 2018-11-13 | 广东合微集成电路技术有限公司 | A kind of control method of intelligent tire |
| CN109130716A (en) * | 2018-09-21 | 2019-01-04 | 深圳市元征科技股份有限公司 | Configuration system, method and the terminal device of tire pressure monitoring sensor |
| CN109443415A (en) * | 2018-11-30 | 2019-03-08 | 北京长城华冠汽车科技股份有限公司 | A kind of the concentration scaling method and device of automobile sensor |
| CN112319146B (en) * | 2020-10-16 | 2022-10-11 | 深圳市云伽智能技术有限公司 | Learning method, device, sensor, system and medium of tire pressure monitoring system |
| CN114228408A (en) * | 2021-11-09 | 2022-03-25 | 赛赫智能设备（上海）股份有限公司 | TPMS detection equipment with adjustable power 125KHz signal amplifier and detection method thereof |
| CN114211915B (en) * | 2021-11-11 | 2024-03-29 | 赛赫智能设备（上海）股份有限公司 | Whole vehicle offline TPMS detection system with multi-coil distributed low-frequency excitation antenna and detection method thereof |
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