CN102673326A - Pressure monitoring system for one-way communication tire - Google Patents
Pressure monitoring system for one-way communication tire Download PDFInfo
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- CN102673326A CN102673326A CN201110066744XA CN201110066744A CN102673326A CN 102673326 A CN102673326 A CN 102673326A CN 201110066744X A CN201110066744X A CN 201110066744XA CN 201110066744 A CN201110066744 A CN 201110066744A CN 102673326 A CN102673326 A CN 102673326A
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Abstract
The invention relates to a pressure monitoring system for a one-way communication tire. The pressure monitoring system comprises an electronic control unit, wherein the electronic control unit comprises a microprocessor and a radio frequency receiving assembly. The radio frequency receiving assembly comprises a low-frequency time controller and an interruption port, the low-frequency time controller is used for generating periodic interruption so as to wake up the radio frequency receiving assembly to work, the radio frequency receiving assembly receives and processes radio frequency signals from an emitter so as to obtain radio frequency data, and the interruption port is used for informing the microprocessor that the radio frequency data are obtained. If the radio frequency signals are not received within a preset time, the radio frequency receiving assembly enters a standby state.
Description
Technical field
The present invention relates to tire pressure monitoring system, especially relate to a kind of tire pressure monitoring system of one way communication pattern.
Background technology
In the vehicle electric field, application radio frequency (RF) technology is carried out data transmission and processing and has been widely applied to system for monitoring pressure in tyre (TPMS) product.Improve, dwindle considerations such as small product size from level of integrated system, the modularization processing has generally been adopted in the reception of RF in the system, emission design.A series of RF chips of electronics firm's release at present are used to transmit and receive rf data, and are applied on the automobile electronics.Various RF chips possess functions such as lock phase, mixing, baseband filtering and amplification usually, have the serial output function of demodulating data simultaneously.The state of these chips can dispose, and multipotency provides mode of operation and standby mode two states, and the general electric current of mode of operation surpasses 4mA, the several uA of standby mode.
In the car load designing requirement of automobile, the current value to vehicle after flame-out has strict restriction.General ECU is limited in below the 1mA, to guarantee the power consumption of automobile storage battery.ECU for TPMS also is like this.For any TPMS product, after vehicle was flame-out, the system that must guarantee quit work, thereby reduced power consumption.Because high frequency generator is main power consumption source, so necessarily require MCU and RF chipset to get into standby mode.Under standby mode, ECU no longer receives and the processing RF data.
Pattern is divided into one way communication pattern and two-way communication mode on the TPMS product now.The transmission of the receiver in the one way communication pattern only allows from the projector of sensor to car, two-way communication mode allows the mutual transmission of the two.
One way communication pattern TPMS is present main product.ECU design based on the TPMS of one way communication pattern all is after vehicle ignition, just to start working.And present national TPMS standard has been stressed self check and alarm content, and has described test method.In fact the national standard content requires the TPMS of a new generation, has following function: flame-out low-power consumption, the instant data handing of lighting a fire, enough tenure of use.
Like this; Present main flow one way communication pattern TPMS product can't satisfy national standard; Reason mainly is: the TPMS design of existing one way communication pattern; For satisfying the tenure of use of projector, the transmit cycle of projector can not be too short, and usually the design cycle was greater than 1 minute (substantially exceeded GB and require the response time in 10 seconds after the vehicle ignition).Transmit cycle is consistent under flame-out Parking and driving states, perhaps under driving states, just launches data.Correspondingly, receiver gets into standby and no longer receives processing data in flame-out back.
Though the retail TPMS product that has can be seen data for satisfying before customer requirements is driven, the designed reception machine remains mode of operation after vehicle is flame-out.Though this design can be satisfied the requirement of national standard for quick response, this causes electric current to reach more than the 10mA, can not satisfy the limit the quantity of requirement of car load factory to electric current.
In Automobile Electronic Industry, also there is another kind of fuel saving design, and becomes selection preferably.After flame-out, design main frame MCU periodically gets into standby mode, stops high frequency generator work, configuration lower frequency oscillator clocking (it is little that low frequency oscillator produces power consumption), timing wake-up main frame MCU.Wake RF up through main frame MCU then and receive module work, the RF signal is received.MCU waits for a period of time; Whether the data-out port that inspection RF receives module has output, if do not have, then controls RF again and receives module entering readiness for action; Own then call instruction also gets into readiness for action again, and waits for the arrival that next time wakes clock up.
Above-mentioned design has reduced flame-out back power consumption to a certain extent, but the reduction degree is limited.And all need MCU and RF be waken up at every turn; The MCU wakeup process also need expend certain hour with wait RF data; Moreover whether the entire RF module detects has the shared total system wakeup time of rf data arrival less, comparatively remarkable thereby wake-up period prolongs with the increase of RF dropout rate.The entire system power consumption is mainly reflected in whether data have the wait deterministic process of output after system wake-up process and the detection, rather than detects RF and transmit.This type of design-calculated drawback can cause insensitive.Launch tens frame RF signals continuously such as needs, handle so that ECU runs into frame data.So largely reduce battery
Period of service, be applied to the TPMS product and also be the same, the projector electric quantity consumption increases or the RF acceptance rate reduces that to cause ECU disconnected to the emitter failures erroneous judgement.
Summary of the invention
The present invention provides a kind of TPMS of one way communication pattern, obtains up-to-date data after can making automotive ignition, satisfies the system low-power consumption requirement simultaneously.
The present invention is that to solve the problems of the technologies described above the technical scheme that adopts be a kind of one way communication tire pressure monitoring system, comprises an electronic control unit, and this electronic control unit comprises a microcontroller and a radio frequency receiving unit.This radio frequency receiving unit comprises low frequency time controller and middle fracture; This low frequency time controller is in order to produce periodic interruption; Carry out work to wake this radio frequency receiving unit up; This radio frequency receiving unit receives and handles from the radiofrequency signal of a projector obtaining rf data, and through the acquisition of fracture in this to this microcontroller notice rf data; If in a schedule time, do not receive radiofrequency signal, this radio frequency receiving unit gets into readiness for action.
In one embodiment of this invention, this radio frequency receiving unit also comprises a radio freqneucy oscillator, and this low frequency time controller wakes this radio frequency receiving unit up through starting this radio freqneucy oscillator.
In one embodiment of this invention, this radio frequency receiving unit also comprises a configuration register, and this configuration register is in order to the interrupt cycle of configuration low frequency time controller and should the schedule time.
In one embodiment of this invention; This radio frequency receiving unit also comprises a configuration register, and in order to dispose one with reference to rf data, whether the rf data that this radio frequency receiving unit relatively obtains and this are required rf data with reference to rf data with the rf data of confirming this acquisition; If; Then through the acquisition of fracture in this to this microcontroller notice rf data, if not, readiness for action then got into.
In one embodiment of this invention, this configuration register is configured by this microcontroller.
In one embodiment of this invention, after this microcontroller obtains to notify, receive and handle this rf data, get into readiness for action then again.
In one embodiment of this invention, the interrupt cycle of this low frequency time controller is greater than 1mS.
Under normal circumstances, the emission of the projector per minute of tire is this radiofrequency signal once, and under abnormal condition (like the tire pressure steep variation), the emission of the projector per second of tire is this rf data once.Therefore, set the interrupt cycle of low frequency time controller, can obtain minimum emitter data immediately so that behind the automotive ignition.Because adopt above technical scheme, the present invention compares with the one way communication TPMS system of prior art, can under the automobile flameout state, be cost with lower power consumption, upgrade data from the tire projector.
Description of drawings
For let above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, elaborate below in conjunction with the accompanying drawing specific embodiments of the invention, wherein:
Fig. 1 illustrates the automobile ECU structure of one embodiment of the invention.
Fig. 2 A, Fig. 2 B illustrate the ECU workflow of one embodiment of the invention.
Fig. 3 illustrates the RF data frame format of one embodiment of the invention.
The specific embodiment
With reference now to accompanying drawing, describes theme required for protection, all using identical reference number to refer to identical element in the accompanying drawing.In the following description, for the purpose of explaining, stated that numerous details are to provide the complete understanding to theme required for protection.Yet it is obvious that, and these themes also can not adopt these details to implement.In other cases, show known construction and device with the block diagram form so that describe the present invention.
Fig. 1 illustrates the automobile ECU structure of one embodiment of the invention.With reference to shown in Figure 1, ECU (Electronic Control Unit, electronic control unit) 100 is configured in the automobile, as the part of TPMS (system for monitoring pressure in tyre).ECU 100 comprises RF receiving unit 120 and 140 two parts of MCU (Micro Control Unit, microcontroller).120 main reception and the processing of being responsible for the RF signal of RF receiving unit, and output data is given MCU 140.MCU 140 is as the core of ECU, and processing data is also controlled other external devices.
Usually, expectation radio freqneucy oscillator and receiving unit are not worked as far as possible, to reduce the power consumption of whole ECU.Therefore, behind the automobile flameout, these devices all get into standby mode.For this reason, dispose a low frequency time controller (WTA) 125, this WTA 125 can periodically produce interruption, opens radio freqneucy oscillator 124.In the time cycle that does not have to interrupt, radio freqneucy oscillator and receiving unit keep readiness for action.For radio freqneucy oscillator 124, the cycle of cyclic interrupt is a low frequency, more than 1mS.With wake MCU up and start radio frequency and receive and to compare, the mode of waking RF receiving unit 120 up that present embodiment adopted can make that wakeup time is shorter, and owing to needn't all wake MCU up at every turn, therefore required power consumption significantly reduces.
When entire RF receiving unit 120 is in mode of operation; Signal conditioning is carried out in path along LNA 121, frequency mixer 122, filter 126, intermediate amplifier 127; To carry out processing such as high frequency amplification, mixing, filtering, intermediate frequency amplification, detection successively; The RF signal is reduced to the RF data, and passes through SPI 129 to MCU 140 output datas.Because devices such as LNA 121, frequency mixer 122, filter 126, intermediate amplifier 127 relate to the conventional processing of RF receiving unit 120, are not emphasis of the present invention, thereby do not launch in detail at this.
Data in configuration register 130, have been disposed with reference to RF; The RF data that are used for and reduce are compared, if data format conforms to, then RF receiving unit 120 can interrupt to MCU 140 requests through middle fracture 131; MCU 140 will be waken up, and the input data of SPI 141 are handled.
MCU 140 comprises such as interfaces such as SPI 141, middle fracture 142, SCI 144 and CAN 145, and comprises flash memory (FLASH) 143 and RAM 146.
Content in the configuration register 130 can be write through SPI 141 by MCU 140.
According to designing requirement, MCU 140 needs to select the standby mode wakeup time short, and the chip that standby mode is low in energy consumption is such as the MSP430 series of products of TI company.About power consumption electric current 1uA, wakeup time is less than 6uS under low-power consumption mode for MCU 140.
In addition, for satisfying newly-designed requirement: get rid of environmental factors and can accurately receive each frame RF data, the no-missing-code situation needs appropriate design time slice RF frame format and RF data baud rate.
Fig. 3 illustrates an exemplary RF frame format, comprises wake-up signal territory, synchronizing signal territory, data field and stop bit.
For the modulation wave signal of baud rate 9600, general 0.1mS of the transmission time of each, wake-up signal is made up of continuous high-low level.Effectively being judged as of RF receiving unit 120 is set receives continuous 6 high-low levels, need time 0.6mS.Time slice T for 1mS
Slot, wake-up signal is designed to the continuous high-low level of 1.6mS.For different other times sheet of cycle, the time span of wake-up signal can be T
Slot+ 0.6mS.This will guarantee each RF frame transmission, and its wake-up signal can drop in the wake-up period, and makes RF receiving unit 120 receive 6 continuous high-low level wake-up signals at least.RF receiving unit 120 produces and interrupts then, wakes MCU 140 up and gets into mode of operation, waits for receiving the detection data.If RF receiving unit 120 does not detect the RF signal, then get into readiness for action at once.
Fig. 2 A, Fig. 2 B illustrate the ECU workflow of one embodiment of the invention.Shown in Fig. 2 A, 2B, like step S1, when vehicle ', keep the complete mode of operation of ECU, continue to receive and processing RF information.
At step S2, MCU 140 detects whether the vehicle level that stops working is arranged.
When MCU 140 detects the flame-out level of vehicle, then start low frequency time controller 125 at step S3, this low frequency time controller timing range can reach 1mS by several days, the about 1.5 μ A of its power consumption electric current representative value.
At step S4, the configuration register 130 of 140 pairs of RF receiving units 120 of MCU carries out parameter configuration, comprises the RF frame format, the interrupt cycle of low frequency time controller 125, and RF oscillator 12 is by the cycle of operations after waking up.At step S5, when not having the RF signal, RF receiving unit 120 gets into readiness for action, closes RF oscillator 124.
Then, at step S6, MCU 140 call instructions get into readiness for action, close high frequency generator.About power consumption electric current 1uA, wakeup time is less than 6uS under low-power consumption mode for MCU.
So ECU 100 has only low frequency time controller 125 continuous firings after vehicle is flame-out, periodically produce interrupt signal (step S7), add the electric leakage of other device etc., the power consumption electric current of ECU unit is answered＜30uA.
The interruption that low frequency time controller 125 weak points can produce 1mS.Can suitably dispose suitable time slice T
Slot, this interruption is used to wake up 120 work (step S8) of RF receiving unit.
Like step S9, whether after RF receiving unit 120 is waken up, detecting has the RF signal, if any, then begin to handle at step S10.If (for example 100uS) do not receive yet and then gets into step S15 by the RF signal in the given time.
After step S10, get into step S11, handling the RF data that produce will compare with the reference RF data in the configuration register 130, is required RF data to judge these RF data, if get into step S12.Otherwise get into step S15.
At step S12, RF receiving unit 120 produces and interrupts waking up fast MCU 140, the RF data after the detection is passed to MCU 140 handle.
When MCU 140 after step S13 finishes dealing with, get into readiness for action in step S14 again.
At step S15, owing to there is not the RF signal, perhaps the RF data are not the data that need, and RF receiving unit 120 gets into readiness for action at once, waits for time slice T next time
SlotWhat produce wakes up.
For above-mentioned one way communication design, normal circumstances projector per minute is launched a secondary data, every frame duration 20mS.ECU 100 receives, handles and sends information to upper computer, and the time is no more than 40mS.Suppose working current 15mA, per minute power consumption 15 * 40mAmS+30 * 60mAmS, thus calculate average current 40uA, less than the flame-out electric current (0.1mA) of regulation.In addition, emitter design pressure variation fast emission function changes the variation that surpasses 0.11Bar/S when air pressure is lasting, and perhaps variable quantity surpasses 0.3Bar (to the 3.5Bar range), and projector shortens to 1S with transmit cycle, disappears up to variation.According to standard checking high-low pressure warning function; Because tire pressure change procedure and stabilization process; The data that every frame sends can both be received and handle by the ECU of readiness for action, so the change of the corresponding warning sign of (10S) completion at the appointed time after the vehicle ignition.
In addition, can find out that the TPMS system of the embodiment of the invention can't have higher requirement to the transmit cycle of projector, so emitter lifetime can remain on still more than 6 years, can not descend.
Though the present invention discloses as above with preferred embodiment; Right its is not that any those skilled in the art are not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When can doing a little modification and perfect, so protection scope of the present invention is when being as the criterion with what claims defined.
Claims (9)
1. an one way communication tire pressure monitoring system comprises an electronic control unit, and this electronic control unit comprises:
Microcontroller;
The radio frequency receiving unit; This radio frequency receiving unit comprises low frequency time controller and middle fracture; This low frequency time controller is in order to produce periodic interruption; Carry out work to wake this radio frequency receiving unit up, this radio frequency receiving unit receives and handles from the radiofrequency signal of a projector obtaining rf data, and through the acquisition of fracture in this to this microcontroller notice rf data; If in a schedule time, do not receive radiofrequency signal, this radio frequency receiving unit gets into readiness for action.
2. one way communication tire pressure monitoring system as claimed in claim 1 is characterized in that, this radio frequency receiving unit also comprises a radio freqneucy oscillator, and this low frequency time controller wakes this radio frequency receiving unit up through starting this radio freqneucy oscillator.
3. one way communication tire pressure monitoring system as claimed in claim 1 is characterized in that, this radio frequency receiving unit also comprises a configuration register, and this configuration register is in order to the interrupt cycle of configuration low frequency time controller and should the schedule time.
4. one way communication tire pressure monitoring system as claimed in claim 1 is characterized in that this configuration register is configured by this microcontroller.
5. one way communication tire pressure monitoring system as claimed in claim 1 is characterized in that, this radio frequency receiving unit also comprises a configuration register; In order to dispose one with reference to rf data; Whether the rf data that this radio frequency receiving unit relatively obtains and this are required rf data with reference to rf data with the rf data of confirming this acquisition, if, then through the acquisition of fracture in this to this microcontroller notice rf data; If not, then get into readiness for action.
6. one way communication tire pressure monitoring system as claimed in claim 5 is characterized in that this configuration register is configured by this microcontroller.
7. like claim 1 or 5 described one way communication tire pressure monitoring systems, it is characterized in that, after this microcontroller obtains to notify, receive and handle this rf data, get into readiness for action then again.
8. one way communication tire pressure monitoring system as claimed in claim 1 is characterized in that the interrupt cycle of this low frequency time controller is greater than 1mS.
9. one way communication tire pressure monitoring system as claimed in claim 1 is characterized in that, per minute is launched once this radiofrequency signal under this projector normal circumstances, and per second is launched once this rf data under abnormal condition.
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| CN201110066744.XA CN102673326B (en) | 2011-03-18 | 2011-03-18 | One way communication tire pressure monitoring system |
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| CN201110066744.XA CN102673326B (en) | 2011-03-18 | 2011-03-18 | One way communication tire pressure monitoring system |
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| CN102673326A true CN102673326A (en) | 2012-09-19 |
| CN102673326B CN102673326B (en) | 2016-01-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422716A (en) * | 2017-04-20 | 2017-12-01 | 上海保隆汽车科技股份有限公司 | The test device and test control method of TPMS systems |
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| US5783992A (en) * | 1996-07-22 | 1998-07-21 | Delco Electronics Corp. | Time based low tire pressure warning sensor |
| US20040046651A1 (en) * | 2002-09-09 | 2004-03-11 | Hideaki Norimatsu | Tire air pressure monitoring system |
| US20060279411A1 (en) * | 2005-06-14 | 2006-12-14 | Siemens Vdo Automotive Corporation | Signal recognition for combined receiver for remote keyless entry and tire pressure monitoring systems |
| US20080055099A1 (en) * | 2006-08-31 | 2008-03-06 | Oki Electric Industry Co., Ltd. | Wake-up controller and a method therefor for power control over peripheral circuitry based upon slots of a data field |
| CN101301846A (en) * | 2008-02-22 | 2008-11-12 | 哈尔滨工业大学 | Calibration instrument and calibration method for automobile tire pressure monitoring system |
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2011
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5783992A (en) * | 1996-07-22 | 1998-07-21 | Delco Electronics Corp. | Time based low tire pressure warning sensor |
| US20040046651A1 (en) * | 2002-09-09 | 2004-03-11 | Hideaki Norimatsu | Tire air pressure monitoring system |
| US20060279411A1 (en) * | 2005-06-14 | 2006-12-14 | Siemens Vdo Automotive Corporation | Signal recognition for combined receiver for remote keyless entry and tire pressure monitoring systems |
| JP2008544654A (en) * | 2005-06-14 | 2008-12-04 | シーメンス ヴィディーオー オートモーティヴ コーポレイション | Shared receiver signal recognition for remote keyless entry system and pressure monitoring system |
| US20080055099A1 (en) * | 2006-08-31 | 2008-03-06 | Oki Electric Industry Co., Ltd. | Wake-up controller and a method therefor for power control over peripheral circuitry based upon slots of a data field |
| CN101301846A (en) * | 2008-02-22 | 2008-11-12 | 哈尔滨工业大学 | Calibration instrument and calibration method for automobile tire pressure monitoring system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422716A (en) * | 2017-04-20 | 2017-12-01 | 上海保隆汽车科技股份有限公司 | The test device and test control method of TPMS systems |
| CN107422716B (en) * | 2017-04-20 | 2023-09-29 | 保隆霍富(上海)电子有限公司 | Test device and test control method of TPMS (tire pressure monitor System) |
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