CN102529607A - Sensor state control method of TPMS (Tire Pressure Monitor System) - Google Patents
Sensor state control method of TPMS (Tire Pressure Monitor System) Download PDFInfo
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Abstract
The invention relates to a sensor state control method of a TPMS (Tire Pressure Monitor System), aiming to save the power consumption of a sensor. The sensor state control method comprises the following steps of: enabling a sensor normally to be under a closed state, not detecting data and not transmitting radio frequency data; when a vehicle is ignited, noticing the sensor to enter a static state; under the static state, noticing the sensor to enter a driving state when a vehicle speed exceeds a low-speed threshold value; under the static state, noticing the sensor to enter an alarming state when a pressure data change rate of sensor transmission is ensured to exceed a first alarming threshold; and under the driving state, noticing the sensor to enter the alarming state when the pressure data change rate of the sensor transmission is ensured to exceed a second alarming threshold, wherein a transmission period of the radio frequency data under the static state is more than the transmission period of the radio frequency data under the driving state, and the transmission period of the radio frequency data under the driving state is more than the transmission period of the radio frequency data under the under the alarming state.
Description
Technical field
The present invention relates to system for monitoring pressure in tyre (TPMS), especially relate to through the sensor states of TPMS system is controlled saves energy consumption.
Background technology
The sensor of system for monitoring pressure in tyre (TPMS) is built in the tire, so that the monitoring tire pressure data, and be transmitted to the receiver in the car.Sensor uses powered battery, and after running down of battery, the replacing of battery just becomes problem.Therefore, the battery life of expectation sensor is long as far as possible.Mainly contain two kinds of Sensor Design schemes at present:
First kind is the one way communication scheme, and this scheme mainly is sensor active detecting, emission data, the passive reception of controller.Be designed with vibroswitch or acceleration pick-up in some product sensor.This scheme periodically detects and launches data, if further energy-conservation, it is slower to cause data to be obtained, and can't in time receive valid data after the vehicle ignition.Under this scheme, common design sensor battery service life is 5 years.
Second kind is bidirectional communication scheme, and this scheme realizes the passive detection of sensor, emission data.Controller is designed program according to intrinsic, and periodic transmission low frequency wake-up signal poll triggers four tire sensors and carries out the detection of pressure, temperature, and the emission rf data.This working sensor pattern is single, and controller need continue to launch low frequency signal and wake up, and this has increased electromagnetic interference, has also increased power consumption.Possibly cause the false wake-up of other tire sensor in addition, additive incrementation working sensor and energy consumption.Because the working sensor pattern is single, obtains for realizing instant data, controller need frequently trigger.Under this scheme, the sensor bigger raising of failing service life, according to the requirement of GB declaration original text, the life-span is 6 years.
Summary of the invention
Technical matters to be solved by this invention provides the sensor states control method of a kind of TPMS system, through different rf data transmitting frequencies is set for the different sensor state, comes saving in energy.
The present invention solves the problems of the technologies described above the sensor states control method that the technical scheme that adopts is a kind of TPMS of proposition system; This method may further comprise the steps: make this sensor be in a closed condition normally; In this closed condition, sensor does not detect data, and does not launch rf data; When learning automotive ignition, notify this sensor to get into a quiescence, in this quiescence, sensor comprises the rf data of pressure data with the emission of first transmit cycle; In this quiescence, when learning that car speed surpasses a slow door in limited time, notify this sensor to get into a driving state, at this driving states, this sensor is with the rf data of second transmit cycle emission pressure data; In this quiescence, when the pressure data rate of change of confirming sensor emission surpasses one first warning thresholding, then notify this sensor to get into an alarm condition, in this alarm condition, this sensor is with the rf data of the 3rd transmit cycle emission pressure data; And,, then notify this sensor to get into this alarm condition when the pressure data rate of change of confirming sensor emission surpasses one second warning thresholding at this driving states.Wherein, this first transmit cycle is greater than this second transmit cycle, and this transmit cycle is greater than the 3rd transmit cycle.
In one embodiment of this invention, the sensor states control method of above-mentioned TPMS system also comprises: from this sensor receiving sensor current state sign.
In one embodiment of this invention, this alarm condition comprises static alarm condition and driving alarm condition, wherein: when the pressure data rate of change of confirming this sensor emission surpasses this first warning thresholding, then notify this sensor to get into this static alarm condition; When the pressure data rate of change of confirming this sensor emission surpasses this second warning thresholding, then notify this sensor to get into this driving alarm condition; In this static alarm condition, when learning that car speed surpasses this slow door in limited time, notifies this sensor to get into this driving alarm condition; In this driving alarm condition, when learning that car speed is lower than this slow door in limited time, notifies this sensor to get into this static alarm condition.
In one embodiment of this invention, the sensor states control method of above-mentioned TPMS system also comprises: in this closed condition, respond one first user instruction and notify this sensor to get into a dormant state; In this dormant state, respond one second user instruction and notify this sensor to get into this closed condition; Wherein in this dormant state, this sensor does not detect data, and does not launch rf data.
In one embodiment of this invention, the sensor states control method of above-mentioned TPMS system also comprises: in this quiescence, respond one the 3rd user instruction and notify this sensor to get into a dormant state; In this dormant state, respond a four-function family and instruct and notify this this quiescence of sensor entering; Wherein in this dormant state, this sensor does not detect data, and does not launch rf data.
In one embodiment of this invention, the sensor states control method of above-mentioned TPMS system also comprises: in this quiescence, driving states, static alarm condition or driving alarm condition, when learning automobile flameout, notify this sensor to get into this closed condition.
In one embodiment of this invention, the sensor states control method of above-mentioned TPMS system also comprises: send periodic handshake, make this sensor when not having other trigger conditions, remain on current state; Wherein when this sensor continuous several times does not receive handshake, get into this closed condition.
In one embodiment of this invention, the sensor states control method of above-mentioned TPMS system notifies this sensor to carry out the conversion of state through low frequency signal.
In one embodiment of this invention, this sensor is periodically opened low frequency module at each state.
The present invention is owing to adopt above technical scheme; Make it compared with prior art, because sensor is in the state of lower power consumption, for example closed condition in many times; Quiescence and driving states; Make sensor can both keep low power consuming, thereby saved electric weight, prolonged battery life in the most of the time.
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 TPMS system of one embodiment of the invention.
Fig. 2 illustrates the sensor states figure of one embodiment of the invention.
Fig. 3 illustrates the sensor states figure of another embodiment of the present invention.
Fig. 4 illustrates the sensor states figure of further embodiment of this invention.
The specific embodiment
Fig. 1 illustrates the TPMS system of one embodiment of the invention.With reference to shown in Figure 1, the TPMS system 100 of present embodiment mainly comprises 101, two low frequencies of microcontroller (MCU) (LF) actuator 102a, 102b, radio frequency (RF) receiver 103, CAN bus driver 104, power supply 105, four low-frequency antenna 110a-110d, four sensor 111a-111d.Two low frequencies (LF) actuator 102a, 102b, radio frequency (RF) receiver 103, CAN bus driver 104 all are connected to MCU 101.
Four sensor 111a-111d are arranged in four tires (figure does not show) lining, and four low-frequency antenna 110a-110d are arranged near four tires.Low frequency actuator 102a, 102b can send low frequency communication signal through four low-frequency antenna 110a-110d, so that four sensor 111a-111d are controlled.
Four sensor 111a-111d comprise the radio-frequency transmissions device, with the form of radiofrequency signal the tire pressure that detects are outwards launched.Radio-frequency transmitter 103 can receive the tire pressure radiofrequency signal, and is transferred to MCU101.
CAN bus driver 104 is used for receiving data from other electronic machines of automobile as the communication interface of MCU 101.
According to embodiments of the invention, for reducing the sensor energy consumption,, under the different speed of a motor vehicle, different alert, carry out corresponding conversion, to realize the optimal utilization of electric energy for the multiple different operating state of Sensor Design.For example under some state, the transmission interval that sensor can be very low is launched rf data, even sensor can not launched rf data fully.And under other states, sensor is with very high transmission interval emission rf data, to satisfy the needs that tire pressure detects.Rf data comprises pressure data, and can comprise temperature data.
Conversion between these sensor states can be by the controller of TPMS system under the different vehicle state, controls through the LF communication mode and accomplishes.
Under each state, sensor makes the unlatching of its low frequency drive periodic property, to receive the instruction of controller.
Preferably, after sensor states converts, can send information, identify its current states to MCU.MCU receives this status indicator to confirm the present state of sensor, carries out the foundation of state exchange as next time.
Below, the definition of each sensor states is at first described with reference to Fig. 2.
1, dormancy (Winter) state
Sensor is not launched rf data under this state, do not detect data yet, and just the low frequency operation module is periodically opened.If need not detect tire pressure and temperature winter, can make sensor get into this state to save power consumption.Simultaneously, get into dormant state after, the MCU of the TPMS system monitoring of also no longer being correlated with.
In one embodiment, this state can be after igniting (IGN on), after switch through terminal control man machine interface by the user under the quiescence stated, make sensor get into this state, perhaps withdraw from this state and get into quiescence.
In one embodiment, this state can use the low frequency actuator to control, and operation gets into or withdraws from this state, withdraws from the closed condition of stating after the back gets into.
2, close (Off) state
Sensor is not launched rf data under this state, do not detect data yet, and just the low frequency operation module is periodically opened.Promptly keep this state after sensor dispatches from the factory,, will carry out corresponding state exchange only if there are other conditions to trigger.
Getting into the closed condition condition can be:
A) when sensor to tire pressure less than 0.3Bar, get into and the state that keeps shut constant, this state is for the tire that just dispatched from the factory is provided with, sensor also need start work this moment.
B) send " entering closed condition " command signal through low frequency actuator 102a or 102b as MCU 101; The continuous per second of sensor this moment sends 5 frame radio-frequency informations; Carry tire pressure information and " get into the Off state ", preserve field data, get into closed condition then at the Status Flag bit-identify.
C) under non-closed condition, MCU 101 periodically (for example, the cycle can be 3 minutes) sends short and small low frequency handshake, and this moment, the projector of sensor confirmed that MCU 101 and low-frequency antenna end are in proper working order, just maintained the original state.When continuous several times (as 5 times or more than) handshake in cycle can't receive that projector sends 5 frame radio-frequency informations with continuous per second, carries tire pressure information and " gets into the Off state " at the Status Flag bit-identify, preserves field data, gets into closed condition then.
The condition that withdraws from closed condition is:
When sensor receives " entering quiescence " information of low frequency signal, will withdraw from closed condition, go forward side by side into static state.This moment is detected temperatures pressure and failure message at once, and sends data message through radio frequency, and this frame state byte can the index transducer current state be " quiescence ".
When the sign indicating number energizing signal that receives low frequency, the state that will keep shut, and launch frame RF data.
3, quiescence (the IGN on speed of a motor vehicle＜15km/h)
After the igniting, MCU will trigger the sensor conversion through low-frequency antenna and get into this state.Sensor under static state detects a secondary data with a sense cycle, and with first transmit cycle emission data.After the condition of quiescence is vehicle ignition, the speed of a motor vehicle＜15km/h.The cycle that below is certain exemplary is set:
The temperature detection cycle: 5min;
The pressure detection cycle: 4s;
RF transmit cycle: 5min;
The battery voltage detection cycle: 60min.
4, driving states (the IGN on speed of a motor vehicle＞15km/h)
After igniting, and the speed of a motor vehicle＞15km/h, sensor gets into driving states by quiescence.Sensor detects a tire pressure with above-mentioned sense cycle under driving states, with one second transmit cycle emission rf data.The cycle that below is certain exemplary is set:
The temperature detection cycle: 60s;
The pressure detection cycle: 4s;
RF transmit cycle:＜60s;
The battery voltage detection cycle: 60min.
5, static alarm condition
Change fast when system detects tire pressure, for example pressure change rate Δ P surpasses a warning thresholding, then notifies sensor to get into this state, and launches rf data one time.If receive the sign indicating number energizing signal of low frequency, send one time rf data at once;
If speed >=15km/h then converts the driving alarm condition into.
The cycle that below is certain exemplary is set:
The temperature detection cycle: 60s;
The pressure detection cycle: 4s;
RF transmit cycle: 4s;
The battery voltage detection cycle: 60min.
6, driving alarm condition
Change fast when system detects tire pressure, for example pressure change rate Δ P surpasses a warning thresholding, and then sensor gets into this state, and launches rf data one time.
If receive the energizing signal that low frequency is learned sign indicating number, send one time rf data at once.
If speed＜15km/h, then convert to static alarm condition.
The cycle that below is certain exemplary is set:
The temperature detection cycle: 60s;
The pressure detection cycle: 4s;
RF transmit cycle: 4s;
The battery voltage detection cycle: 60min.
Visible from above cycle setting, the pressure detection cycle all is 4 seconds.The pressure detection cycle allows difference or fluctuation, but from security consideration, the pressure detection cycle all is merely several seconds at present.The rf data transmit cycle then has bigger variation; In quiescence, exemplary transmit cycle is 5 minutes, at driving states; Exemplary transmit cycle is less than 1 minute; In static warning and driving alarm condition, exemplary transmit cycle is 4 seconds, and promptly every detection one secondary data is promptly launched rf data one time.It is thus clear that the transmit cycle of quiescence is maximum, the transmit cycle of driving states secondly, and static warning and driving alarm condition are minimum.Be appreciated that these transmit cycles can change with designing requirement in certain scope, but their magnitude relationship remains unchanged.Therefore compare with the power consumption under the driving alarm condition with static warning, the power consumption under quiescence and the driving states is all obviously less, and such state helps to save battery.
The control of TPMS system to sensor states is below described.
MCU 101 has CAN actuator 104, through CAN bus communication mode, can the collection vehicle status information, and comprise igniting information, brake information, speed information, engage a gear information, engine information etc.MCU 101 obtains the corresponding working state of each sensor through the data of being gathered are carried out analyzing and processing, and control command is sent to sensor comes the Control work state, and waits for that the sensor states conversion confirms.After the affirmation, the constant low frequency that then no longer carries out of driving states triggers.
According to vehicle condition information and user instruction, sensor is changed between above-mentioned 6 kinds of states, and Fig. 2 illustrates the sensor status figure of an embodiment.In embodiment illustrated in fig. 2, can be through user's operation between dormant state and the closed condition, between dormant state and the quiescence, MCU sends the instruction of low frequency signal and changes.Closed condition withdraws to quiescence, can detect automobile ignition signal by controller and trigger.
Conversion between quiescence and the static alarm condition is to be decided by tire pressure rate of change-Δ P that MCU calculates, and is controlled by the new instruction of low frequency.In case it is too fast that pressure changes, surpass one first warning thresholding, get into static alarm condition by quiescence.Otherwise,, then return quiescence by static alarm condition when pressure no longer changes.
Similarly, the conversion between driving states and the driving alarm condition is to be decided by tire pressure rate of change-Δ P that MCU calculates, and is controlled by the new instruction of low frequency.In case it is too fast that pressure changes, surpass one second warning thresholding, get into the driving alarm condition by driving states.Otherwise,, then return driving states by the driving alarm condition when pressure no longer changes.
The first warning thresholding can be identical or different with the second warning thresholding.
Quiescence, static alarm condition and driving states, the conversion of driving between the alarm condition are to be decided by the road speed that MCU learns, and by the instruction control of low frequency signal.When learning that slow door that car speed surpasses 15Km/h in limited time, gets into driving states by quiescence, perhaps get into the driving alarm condition by static alarm condition, vice versa.
Automobile is under quiescence, static alarm condition, driving states and driving alarm condition, if MCU learns engine off, then the instruction by low frequency signal returns to closed condition.In addition, if sensor then do not receive periodic handshake also can return to closed condition voluntarily.
Fig. 3 illustrates the constitution diagram of another embodiment.Can carry out the conversion of some state, the for example conversion between dormant state and the closed condition by hand-held low frequency instrument.This usually occurs in tire and from vehicle, unloads, thereby when idle.In addition, in static alarm condition and quiescence, the energizing signal that can learn sign indicating number by low frequency is by rf data of sensor emission, and remains on current state.Perhaps, accomplish static alarm condition to the conversion the quiescence by the energizing signal of low frequency sign indicating number.
As indicated above, under static alarm condition and driving alarm condition, the sense cycle and the transmit cycle of pressure data remain unchanged, and only are that road speed changes.Being indifferent under the situation of road speed, can merge two states.
Fig. 4 illustrates a kind of constitution diagram of simplification.Only comprise an alarm condition in this constitution diagram.All can arrive alarm condition from quiescence and driving states.
Owing to designed the state of many lower power consumptions of sensor, closed condition for example, quiescence and driving states make sensor can both keep low power consuming in the most of the time, thereby have saved electric weight, have prolonged battery life.Below be the electric quantity consumption Theoretical Calculation:
The battery life Theoretical Calculation:
Capacity of cell: 540mAh
Closed condition: LF periodically opens
1 hour LF power consumption: 10uA*0.1s*60*60=3600uAs
1 hour quiescent current: 0.6uA*60s*60=2160uAs
1 day: 5760uas * 24=138240uAs
Self-discharge of battery: 0.3%/year
1 year: 138240 * 365 * 1.003=14mAh
10 years: 140mAh
Fired state: normal operation of sensor, 1 hour consumption of current
Pressure survey: 11uAS*20*60=13200uAs
Temperature survey: 5uAS*60=300uAs
Voltage measurement: 4uAS*1=4uAs
LF electric current: 10uA*0.1s*60*60=3600uAs
Quiescent current: 0.6uA*60s*60=2160uAs
RF transmitter current: 10mA*0.008s*60=4800uAs
Self-discharge of battery: 0.3%/year
1 hour: 24136uas=0.0067mAh
Quick gas leakage state: suppose the per second 0.01Bar that leaks gas at most, average 2.5Bar pressure needs 250S promptly to leak in 4 minutes, RF emitting times 61 times, and power consumption 4800uAs approximately is so the increase electric current that leaks gas is about 0.0013mAh at every turn.
State leaks gas at a slow speed: the emission of the rf data of the state that leaks gas at a slow speed, basic suitable with the normal radio frequency transmit cycle, increase electric current and can ignore.
Pressure alarm: pressure alarm only switches fast emission RF signal at once in warning, can ignore so increase electric current.
Vehicle usage condition design: every three months fast gas leakage once, every month pressure alarm once, daily use vehicle 10 hours.
Conversion is leaked gas 1/90 time every day, and every day, pressure alarm was 1/30 time, and every day, consumption of current was altogether: 0.0067 * 10+0.0016 * 14+0.0013/90=0.09mAh
Convert 10 years power consumption: 0.09 * 365 * 10 * 1.003=325mAh
Can know that through aforementioned calculation the scheme of the embodiment of the invention can make sensor reach more than 10 years service life, meet car load tenure of use.
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. the sensor states control method of a TPMS system, this method may further comprise the steps:
Make this sensor be in a closed condition normally, in this closed condition, sensor does not detect data, and does not launch rf data;
When learning automotive ignition, notify this sensor to get into a quiescence, in this quiescence, sensor comprises the rf data of pressure data with the emission of first transmit cycle;
In this quiescence, when learning that car speed surpasses a slow door in limited time, notify this sensor to get into a driving state, at this driving states, this sensor is with the rf data of second transmit cycle emission pressure data;
In this quiescence, when the pressure data rate of change of confirming sensor emission surpasses one first warning thresholding, then notify this sensor to get into an alarm condition, in this alarm condition, this sensor is with the rf data of the 3rd transmit cycle emission pressure data; And
At this driving states,, then notify this sensor to get into this alarm condition when the pressure data rate of change of confirming sensor emission surpasses one second warning thresholding;
Wherein, this first transmit cycle is greater than this second transmit cycle, and this transmit cycle is greater than the 3rd transmit cycle.
2. the sensor states control method of TPMS as claimed in claim 1 system is characterized in that, also comprises:
From this sensor receiving sensor current state sign.
3. according to claim 1 or claim 2 the sensor states control method of TPMS system is characterized in that this alarm condition comprises static alarm condition and driving alarm condition, wherein:
When the pressure data rate of change of confirming this sensor emission surpasses this first warning thresholding, then notify this sensor to get into this static alarm condition;
When the pressure data rate of change of confirming this sensor emission surpasses this second warning thresholding, then notify this sensor to get into this driving alarm condition;
In this static alarm condition, when learning that car speed surpasses this slow door in limited time, notifies this sensor to get into this driving alarm condition;
In this driving alarm condition, when learning that car speed is lower than this slow door in limited time, notifies this sensor to get into this static alarm condition.
4. the sensor states control method of TPMS as claimed in claim 1 system is characterized in that, also comprises:
In this closed condition, respond one first user instruction and notify this sensor to get into a dormant state;
In this dormant state, respond one second user instruction and notify this sensor to get into this closed condition;
Wherein in this dormant state, this sensor does not detect data, and does not launch rf data.
5. the sensor states control method of TPMS as claimed in claim 1 system is characterized in that, also comprises:
In this quiescence, respond one the 3rd user instruction and notify this sensor to get into a dormant state;
In this dormant state, respond a four-function family and instruct and notify this this quiescence of sensor entering;
Wherein in this dormant state, this sensor does not detect data, and does not launch rf data.
6. the sensor states control method of TPMS as claimed in claim 3 system is characterized in that, also comprises:
In this quiescence, driving states, static alarm condition or driving alarm condition, when learning automobile flameout, notify this sensor to get into this closed condition.
7. the sensor states control method of TPMS as claimed in claim 1 system is characterized in that, also comprises:
Send periodic handshake, make this sensor when not having other trigger conditions, remain on current state;
Wherein when this sensor continuous several times does not receive handshake, get into this closed condition.
8. the sensor states control method of TPMS as claimed in claim 1 system is characterized in that, notifies this sensor to carry out the conversion of state through low frequency signal.
9. the sensor states control method of TPMS as claimed in claim 8 system is characterized in that this sensor is periodically opened low frequency module at each state.
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| CN106314045A (en) * | 2016-08-17 | 2017-01-11 | 北京中聚高科科技有限公司 | Tire pressure monitoring device and method based on bus awakening mode |
| CN107415606A (en) * | 2016-05-23 | 2017-12-01 | 高福科技股份有限公司 | The operating method of radio tire pressure monitoring system |
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| US10864784B2 (en) | 2017-12-01 | 2020-12-15 | Pacific Industrial Co., Ltd. | Transmitter, trigger device, transmitter mode setting system, and transmitter mode setting method |
| CN110114229B (en) * | 2017-12-01 | 2021-10-22 | 太平洋工业株式会社 | Transmitter, trigger, mode setting system for transmitter, and mode setting method for transmitter |
| CN110114229A (en) * | 2017-12-01 | 2019-08-09 | 太平洋工业株式会社 | Transmitter, trigger, the mode setting system of transmitter and the mode initialization method of transmitter |
| CN109968923A (en) * | 2017-12-27 | 2019-07-05 | 胡夫·许尔斯贝克和福斯特有限及两合公司 | Tire pressure monitoring unit |
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| CN111006739A (en) * | 2019-11-25 | 2020-04-14 | 江苏智冷物联技术有限公司 | Sensor, Dewar flask and data sending method |
| CN111006739B (en) * | 2019-11-25 | 2021-09-10 | 江苏智冷物联技术有限公司 | Sensor, Dewar flask and data sending method |
| CN110901309A (en) * | 2019-11-28 | 2020-03-24 | 东风商用车有限公司 | Tire pressure detection method for commercial vehicle |
| CN110901310A (en) * | 2019-11-28 | 2020-03-24 | 东风商用车有限公司 | Commercial vehicle tire pressure detection system |
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