CN103935196A - Tire pressure sensing system capable of automatically configuring - Google Patents
Tire pressure sensing system capable of automatically configuring Download PDFInfo
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- CN103935196A CN103935196A CN201410193406.6A CN201410193406A CN103935196A CN 103935196 A CN103935196 A CN 103935196A CN 201410193406 A CN201410193406 A CN 201410193406A CN 103935196 A CN103935196 A CN 103935196A
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Abstract
The invention provides a tire pressure sensing system capable of automatically configuring an IDOT (tire beacon). The system fully utilizes a sensor, a control device and the like in an existing tire pressure monitoring system, so that the IDOT can be automatically and reliably distributed into a specific wheel, and the accurate and reliable tire pressure monitoring can be further realized; the tire pressure sensing system has beneficial technical effects.
Description
Technical field
The present invention relates to a kind of tire pressure monitoring system, relate in particular to the one tire pressure sensor-based system of configuration ID OT (tire beacon) automatically.
Background technology
Tire is the important component part of automobile chassis.As important supporting member and walking element, tire is not only carrying the all-mass of automobile, also will advance propulsive force is provided to automobile, plays the effect that relaxes ground shock simultaneously.The economy of road-holding property, ride comfort, safety, traveling comfort and the fuel oil of tire to automobile all plays a part very crucial.
Road traffic accident is the serious problem that All Countries all faces.The investigation nearest according to SAE shows, annual 260000 traffic accidents of the U.S. are because tire pressure is low or seepage causes, and have 70%～80% in the traffic accident that China Expressway occurs, and causing by blowing out, the car crash accident causing because blowing out suddenly in running at high speed is listed in the freeway accident accident umber one.Blow out and become an important potential safety hazard in scorch.In order to ensure vehicle safety travel, a kind of more current method is that TPMS (tire pressure monitoring system) is installed on automobile, the parameter such as pressure, temperature of Real-Time Monitoring tire, for the low tire pressure causing because of tire flat, and Yin Gaowen, high tire pressure and easily produce the situation of blowing out, with visual signal or also can comprise that audible signal shows and warns.The safety of running car can be improved like this, and the energy consumption because of the not enough tire accelerated wear test causing of air pressure and reduction vehicle can be reduced.
Conventional TPMS is mainly divided into two types at present, and a kind of is the indirect type TPMS that adopts wheel velocity, and another kind is the direct-type TPMS that adopts pressure sensitive unit.Wherein, direct-type TPMS all preponderates in function and performance, main by being arranged on pressure, temperature sensing unit and the signal processing unit in motor tire, the TPMS transmitter module that RF transmitter unit forms, and be arranged on the RF receiving element, the liquid crystal display composition that on vehicle cab, comprise digital signal processing unit.Indirect type TPMS carrys out the rotating speed difference between comparative tire by ABS (anti-skid brake system) wheel speed sensing unit, and to reach the object that monitors tire pressure, major defect is to judge with under-voltage and high-speed case more than two tire.
In order extremely to appear at which wheel by display of tyre inflation pressure (below also referred to as tire pressure), tire pressure monitoring system just must know that the tire pressure monitoring unit of installing on which wheel of automobile sends abnormal tyre pressure signal.For this reason, the signal of tire pressure monitoring unit transmission not only comprises tire pressure, also comprises exclusive IDOT, and described IDOT is normally a string is used for the numeral of each tire pressure monitoring unit of unique identification.In order to make tire pressure monitoring system the string number of its reception can be assigned to concrete wheel or concrete wheel position, the relations of distribution one to one of the IDOT of vehicle-mounted each tire pressure monitoring unit and they and described wheel position must send to described tire pressure monitoring system storage therein in advance, or store in connected memory device.
In the time comparing rotating speed, different wheel can be variant on rotating speed in existing distribution method supposition, these differences have different causes, for example, skidding between wheel and road surface, the different radius of gyration being caused by different tire size or different load or different tire pressures, especially turns.When turning, the distance that the wheel in bend outside is walked than the wheel of curve inner side conventionally, therefore fast than the vehicle wheel rotational speed of curve inner side.In fact the speed difference between automotive wheel may be very little, even little of ignoring in the time keeping straight on.Thus, from the angle of engineering survey, as long as the tachometer value that the acceleration pick-up in tire pressure monitoring unit detects is consistent in inevitable error limit with the rotating speed of being measured by abs sensor, prior art will be considered as described two speed revolution values coupling.Only successively each abs sensor is being compared, and in during while detecting good coupling, the IDOT of tire pressure monitoring unit is just assigned to the abs sensor that coupling tach signal is provided.Its shortcoming is that tire pressure monitoring system needs a very long time that all IDOT that receive are assigned to concrete abs sensor, i.e. wheel position one by one.Particularly, existing method is very sensitive to wrong distribution.As long as no exactly the IDOT that is arranged on the tire pressure monitoring unit on automobile being assigned to each wheel position, the control of failure-free tire pressure just cannot realize.
Therefore, be necessary to propose a kind of accurately tire pressure monitoring system of automatic configuration ID OT.
Summary of the invention
The object of the invention is to be achieved through the following technical solutions.
According to the embodiment of the present invention, a kind of tire pressure monitoring system that can automatically configure is proposed, described system comprises and is arranged at four tire pressure monitoring unit and vehicle-mounted interactive terminals in wheel, wherein, described tire pressure monitoring unit is IC chip, and it comprises pressure sensor, temperature sensor, angular motion sensor, shock sensor, power supply monitoring sensor, multichannel selected cell, AD conversion unit, reference voltage unit, amending unit, communications interface unit, clock unit and storage location; Described vehicle-mounted interactive terminal comprises rf receiver unit, vehicle-speed monitoring unit, control unit and warning unit;
Wherein, described pressure sensor is for detection of the air pressure in tire, to obtain force value;
Described temperature sensor is for detection of the temperature in tire, to obtain temperature value;
Described angular motion sensor is for detection of vehicle wheel rotation direction, to obtain vehicle wheel rotation direction information;
Described shock sensor is for detection of the vibrations that occur on wheel, to obtain wheel vibration information;
Described power supply monitoring sensor is for detection of the power supply voltage of power supply, to obtain power supply voltage value;
Any road gating in described multichannel selected cell control presssure sensor, temperature sensor, power supply monitoring sensor or acceleration pick-up;
Described AD conversion unit carries out analogue to digital conversion to described force value, temperature value, vehicle wheel rotation direction information, wheel vibration information and power supply voltage value, to obtain respectively digital value
Described reference voltage unit provides reference voltage for AD conversion unit, and it can be internal voltage reference, also can be external voltage reference;
Described amending unit is revised the digital value of AD conversion unit output;
Described communications interface unit is exported revised digital value, and receives external command, thereby and peripheral system, for example vehicle-mounted interactive terminal, communicates;
Described clock unit provides work clock for multichannel selected cell, AD conversion unit, amending unit and communications interface unit;
Described storage location, for storing the exclusive IDOT of each tire pressure monitoring unit.
According to an embodiment of the invention, described tire pressure monitoring unit also comprises the selection control unit that is optionally respectively pressure sensor, temperature sensor, angular motion sensor, shock sensor, the power supply of power supply monitoring sensor.
According to an embodiment of the invention, described tire pressure monitoring unit also comprises the fuse that the Output rusults of amending unit is carried out to second-order correction and identification.
According to an embodiment of the invention, described tire pressure monitoring unit also comprises reset unit.
According to an embodiment of the invention, described clock unit comprises: the first oscillator of generation the first clock, the second oscillator that produces second clock and foundation the first clock compensate the clock compensation module of calibration to second clock; The frequency of the first clock is greater than the frequency of second clock.
Embodiment according to another preferred, proposes a kind of method of being carried out IDOT distribution by described tire pressure monitoring system, wherein:
Described communications interface unit transmits signals to the rf receiver unit of vehicle-mounted interactive terminal, and described signal not only comprises concrete each tire pressure monitoring exclusive IDOT in unit, also comprises the information of the vibrations that occur on the rotation direction information of concrete wheel and same wheel;
Described vehicle-speed monitoring unit provides a speed signal that is used to refer to automobile driving speed to described vehicle-mounted interactive terminal, wherein said vehicle-mounted interactive terminal record receives the IDOT and the rotation direction information that in signal, comprise, another according to the rotation direction information of recording, the IDOT that belongs to the tire pressure monitoring unit on automobile left side wheel and the IDOT that belongs to the tire pressure monitoring unit in right side wheels are distinguished in described vehicle-mounted interactive terminal, and the vibrations of the vibrations of the tire pressure monitoring unit reception and registration of differentiation automobile left side and the tire pressure monitoring unit reception and registration of car right side, elapsed time interval between the vibration signal sending continuously by the tire pressure monitoring unit of automobile left side or by the tire pressure monitoring unit of car right side is also measured respectively in described vehicle-mounted interactive terminal,
Car speed in the time gap that described vehicle-mounted interactive terminal handle is measured and this time gap that sends to vehicle-mounted interactive terminal multiplies each other, and check this length of drawing of multiplying each other whether consistent with a given wheelbase of automobile within the scope of a specification error, for two wheel shafts of automobile during to overtake, if this assay is consistent, be assigned to the left side that lays respectively on wheel shaft forward in described two wheel shafts or the wheel on right side including in continuous recording two vibration signals in automobile left side or right side IDOT in first signal, and include in continuous recording two vibration signals of automobile left side or right side that IDOT in the signal of second is assigned on the wheel shaft after leaning in described two wheel shafts and with the same side of described forward wheel shaft on wheel.
According to an embodiment of the invention, during travelling backward, occur on the wheel shaft after first in two vibrations of automobile the same side leans on described in being assigned in a time interval, thereafter the vibrations that occur are assigned on described forward wheel shaft, and described time interval equals described wheelbase divided by moving velocity.
According to an embodiment of the invention, whenever two vibration signals are recorded in described vehicle-mounted interactive terminal simultaneously, wherein show that these two vibration signals are while coming from the wheel of two different rotation directions, the IDOT launching with these two vibration signals is assigned on two wheels of same wheel shaft.
According to technical scheme of the present invention, make full use of the device such as sensor and control convenience in existing tire pressure monitoring system, realize automatic failure-free and distributed IDOT to concrete wheel, realize tire pressure monitoring accurately and reliably, there is useful technique effect.
Brief description of the drawings
By reading below detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skill in the art.Accompanying drawing is only for the object of preferred implementation is shown, and do not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Accompanying drawing 1 shows according to the structural representation of the tire pressure monitoring system of embodiment of the present invention.
Accompanying drawing 2 shows the method step diagram of circuit that carries out IDOT distribution according to the tire pressure monitoring system of an embodiment of the invention.
Detailed description of the invention
Illustrative embodiments of the present disclosure is described below with reference to accompanying drawings in more detail.Although shown illustrative embodiments of the present disclosure in accompanying drawing, but should be appreciated that and can realize the disclosure and the embodiment that should do not set forth limits here with various forms.On the contrary, it is in order more thoroughly to understand the disclosure that these embodiments are provided, and can be by the those skilled in the art that conveys to complete the scope of the present disclosure.
According to an embodiment of the invention, as shown in Figure 1, described tire pressure monitoring system comprises and is arranged at four tire pressure monitoring unit and vehicle-mounted interactive terminals in wheel, wherein, described tire pressure monitoring unit is IC chip, and it comprises pressure sensor, temperature sensor, angular motion sensor, shock sensor, power supply monitoring sensor, multichannel selected cell, AD conversion unit, reference voltage unit, amending unit, communications interface unit, clock unit and storage location; Described vehicle-mounted interactive terminal comprises rf receiver unit, vehicle-speed monitoring unit, control unit and warning unit;
Wherein, pressure sensor is for detection of the air pressure in tire, to obtain force value.
Temperature sensor is for detection of the temperature in tire, to obtain temperature value.
Described angular motion sensor is for detection of vehicle wheel rotation direction, to obtain vehicle wheel rotation direction information;
Described shock sensor is for detection of the vibrations that occur on wheel, to obtain wheel vibration information;
Described power supply monitoring sensor is for detection of the power supply voltage of power supply, to obtain power supply voltage value;
Any road gating in described multichannel selected cell control presssure sensor, temperature sensor, power supply monitoring sensor or acceleration pick-up;
Described AD conversion unit carries out analogue to digital conversion (described force value, temperature value, vehicle wheel rotation direction information, wheel vibration information and power supply voltage value are the analogue value) to described force value, temperature value, vehicle wheel rotation direction information, wheel vibration information and power supply voltage value and carries out analogue to digital conversion, to obtain respectively digital value.
Reference voltage unit provides reference voltage for AD conversion unit, and it can be internal voltage reference, also can be external voltage reference.
Amending unit is revised the digital value of AD conversion unit output.
Communications interface unit is exported revised digital value, and receives external command, thereby and peripheral system, for example vehicle-mounted interactive terminal, communicates.
Clock unit (accompanying drawing is not shown) provides work clock for multichannel selected cell, AD conversion unit, amending unit and communications interface unit.
Storage location (accompanying drawing is not shown), for storing the exclusive IDOT of each tire pressure monitoring unit.
About reference voltage unit, described tire pressure monitoring unit preferably adopts internal voltage reference, suppress at the integrated small size of chip internal, high precision, high power supply the reference voltage source suppressing with temperature, to meet the requirement of high precision analogue converting unit, this reference voltage source can also be used for measuring accurate temperature information simultaneously, for user provides temperature data, to produce temperature alarming by peripheral system.
Further, described tire pressure monitoring unit also comprises the selection control unit that is optionally respectively pressure sensor, temperature sensor, angular motion sensor, shock sensor, the power supply of power supply monitoring sensor, so, be optionally pressure sensor, temperature sensor, angular motion sensor, shock sensor, the power supply of power supply monitoring sensor, to save power consumption, as, only in pressure sensor work, be only just pressure sensor power supply, other is the same.
Further, described tire pressure monitoring unit also comprises the fuse that the Output rusults of amending unit is carried out to second-order correction and identification.Particularly, the ROM of each of this fuse is made up of 3 fuses, as long as blow wherein one, ROM is representative storage " 1 " just.Described tire pressure monitoring unit also provides multiple different burned mode, as: by root burning, wherein one of a burning, large electric current burning, middle electric current burning, little electric current burning etc., and can guarantee burned reliability, even if guarantee that chip is operated under severe working environment, data also can not be lost and make mistakes, and reliability is higher.In addition, can be also that different chips writes different identity identification informations by blowing some fuse, as numbering etc.
Further, described tire pressure monitoring unit also comprises reset unit, and, described reset unit also arranges two kinds of reset modes, and one is to reset within a short period of time, and one is to reset in a long time, user can, according to demand choice for use, increase user's alternative.
Described clock unit comprises: the first oscillator of generation the first clock, the second oscillator that produces second clock and foundation the first clock compensate the clock compensation module of calibration to second clock; The frequency of the first clock is greater than the frequency of second clock.Preferably, the second oscillator is low-power oscillator, and the second clock frequency of its generation is 2.5kHz, and for internal clocking, the first clock frequency is 2MHz, for sampling and data transmission.Because the second oscillator is low-power oscillator, it adopts ultralow Consumption, all very sensitive to the drift of temperature and voltage, in order to ensure the synchronous of internal clocking, in the time of sampled measurements each time, clock compensation module will compare first, second clock, and according to the first clock (high frequency clock of 2MHz), second clock (low-frequency clock of 2.5kHz) is compensated to calibration.
In described tire pressure monitoring unit, amending unit is revised the digital value of AD conversion unit output, its specific implementation process adopts software algorithm to realize, the temperature value detecting taking temperature sensor is basis, process and calculate through gain, temperature is floated etc., obtain correction, thereby the digital value of AD conversion unit output is carried out to correcting process, to improve precision.
In described tire pressure monitoring unit, preferably, AD conversion unit adopts sigma-delta modulator, with the speed much larger than Nyquist rate, analog signal is carried out to " over-sampling ", and then by each signal increment be converted to 1bit resolution code stream (by " 1 " and " 0 " form) time, make spectrum shaping, the quantizing noise major part of output is transferred to outside base band.But, to depend merely on Delta modulator and be not sufficient to meet desirable precision, described tire pressure monitoring unit has also adopted over-sampling and noise shaping technology, after ∑-Δ ADC modulator, adds decimation filter of digital, eliminates the quantizing noise in most of frequency band.Described ∑-Δ ADC is except the functions such as the sampling that comprises traditional A/D converter and have, quantification, coding, and it also has very strong digital signal processing function, and sampling, quantification, digital signal processing are combined together, has improved the precision of measuring.
In described tire pressure monitoring unit, preferably, communications interface unit is selected SPI interface, certainly, in order to meet client's different demands, also can be set to the combination of a kind of or kind in SPI interface, I2C interface or USB interface.
Embodiment according to another preferred, as shown in Figure 2, proposes a kind of method of being carried out IDOT distribution by described tire pressure monitoring system, wherein:
Described communications interface unit transmits signals to the rf receiver unit of vehicle-mounted interactive terminal, and described signal not only comprises concrete each tire pressure monitoring exclusive IDOT in unit, also comprises the information of the vibrations that occur on the rotation direction information of concrete wheel and same wheel.
Described rf receiver unit is connected to a vehicle-speed monitoring unit, described vehicle-speed monitoring unit provides a speed signal that is used to refer to automobile driving speed to described vehicle-mounted interactive terminal, wherein said vehicle-mounted interactive terminal record receives the IDOT and the rotation direction information that in signal, comprise, another according to the rotation direction information of recording, the IDOT that belongs to the tire pressure monitoring unit on automobile left side wheel and the IDOT that belongs to the tire pressure monitoring unit in right side wheels are distinguished in described vehicle-mounted interactive terminal, and the vibrations of the vibrations of the tire pressure monitoring unit reception and registration of differentiation automobile left side and the tire pressure monitoring unit reception and registration of car right side, elapsed time interval between the vibration signal sending continuously by the tire pressure monitoring unit of automobile left side or by the tire pressure monitoring unit of car right side is also measured respectively in described vehicle-mounted interactive terminal.
Car speed in the time gap that described vehicle-mounted interactive terminal handle is measured and this time gap that sends to vehicle-mounted interactive terminal multiplies each other, and check this length of drawing of multiplying each other whether consistent with the given wheelbase (wheelbase) of automobile within the scope of a specification error, for two wheel shafts of automobile during to overtake, if this assay is consistent, be assigned to the left side that lays respectively on wheel shaft forward in described two wheel shafts or the wheel on right side including in continuous recording two vibration signals in automobile left side or right side IDOT in first signal, and include in continuous recording two vibration signals of automobile left side or right side that IDOT in the signal of second is assigned on the wheel shaft after leaning in described two wheel shafts and with the same side of described forward wheel shaft on wheel.
According to an embodiment of the invention, during travelling backward, occur on the wheel shaft after first in two vibrations of automobile the same side leans on described in being assigned in a time interval, thereafter the vibrations that occur are assigned on described forward wheel shaft, and described time interval equals described wheelbase divided by moving velocity.
According to an embodiment of the invention, described tire pressure monitoring unit is in each record one vibration signal, a time window is opened in described tire pressure monitoring unit, the beginning of described time window and end are limited by the speed of a motor vehicle of having measured, therefore in the time window of opening the IDOT in the vibration signal occurring on a wheel of automobile the same side be subsequently assigned to automobile touch before wheel have on the wheel or wheel position of the same side of a given wheelbase distance, the IDOT that wherein said forward wheel has is included in the vibration signal that comes from the tire pressure monitoring unit of automobile the same side and previously arrived.
According to an embodiment of the invention, whenever two vibration signals are recorded in described vehicle-mounted interactive terminal simultaneously, wherein show that these two vibration signals are while coming from the wheel of two different rotation directions, the IDOT launching with these two vibration signals is assigned on two wheels of same wheel shaft.
According to an embodiment of the invention, by selecting those distribution that frequently occur significantly and it being stored in and being located in a memory device in vehicle-mounted interactive terminal or that be connected with vehicle-mounted interactive terminal, repeatedly set up and distribute and statistically described distribution assessed thus, after point being equipped with which and being stored of all IDOT that receive, described assigning process finishes.
The above; only for preferably detailed description of the invention of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.
Claims (8)
1. the tire pressure monitoring system that can automatically configure, described system comprises the vehicle-mounted interactive terminal that is arranged at four tire pressure monitoring unit in wheel and be arranged at operator's compartment, wherein, described tire pressure monitoring unit is IC chip, and it comprises pressure sensor, temperature sensor, angular motion sensor, shock sensor, power supply monitoring sensor, multichannel selected cell, AD conversion unit, reference voltage unit, amending unit, communications interface unit, clock unit and storage location; Described vehicle-mounted interactive terminal comprises rf receiver unit, vehicle-speed monitoring unit, control unit and warning unit;
Wherein, described pressure sensor is for detection of the air pressure in tire, to obtain force value;
Described temperature sensor is for detection of the temperature in tire, to obtain temperature value;
Described angular motion sensor is for detection of vehicle wheel rotation direction, to obtain vehicle wheel rotation direction information;
Described shock sensor is for detection of the vibrations that occur on wheel, to obtain wheel vibration information;
Described power supply monitoring sensor is for detection of the power supply voltage of power supply, to obtain power supply voltage value;
Any road gating in described multichannel selected cell control presssure sensor, temperature sensor, power supply monitoring sensor or acceleration pick-up;
Described AD conversion unit carries out analogue to digital conversion to described force value, temperature value, vehicle wheel rotation direction information, wheel vibration information and power supply voltage value, to obtain respectively digital value;
Described reference voltage unit provides reference voltage for AD conversion unit, and it can be internal voltage reference, also can be external voltage reference;
Described amending unit is revised the digital value of AD conversion unit output;
Described communications interface unit is exported revised digital value, and receives external command, thereby and peripheral system, for example vehicle-mounted interactive terminal, communicates;
Described clock unit provides work clock for multichannel selected cell, AD conversion unit, amending unit and communications interface unit;
Described storage location, for storing the exclusive tire beacon IDOT of each tire pressure monitoring unit.
2. a system as claimed in claim 1, described tire pressure monitoring unit also comprises the selection control unit that is optionally respectively pressure sensor, temperature sensor, angular motion sensor, shock sensor, the power supply of power supply monitoring sensor.
3. a system as claimed in claim 1, described tire pressure monitoring unit also comprises the fuse that the Output rusults of amending unit is carried out to second-order correction and identification.
4. a system as claimed in claim 1, described tire pressure monitoring unit also comprises reset unit.
5. a system as claimed in claim 1, described clock unit comprises: the first oscillator of generation the first clock, the second oscillator that produces second clock and foundation the first clock compensate the clock compensation module of calibration to second clock; The frequency of the first clock is greater than the frequency of second clock.
6. by claim 1-5, the tire pressure monitoring system described in one of them carries out the method that tire beacon (IDOT) distributes, wherein:
Described communications interface unit transmits signals to the rf receiver unit of vehicle-mounted interactive terminal, and described signal not only comprises concrete each tire pressure monitoring exclusive IDOT in unit, also comprises the information of the vibrations that occur on the rotation direction information of concrete wheel and same wheel;
Described vehicle-speed monitoring unit provides a speed signal that is used to refer to automobile driving speed to described vehicle-mounted interactive terminal, and described vehicle-mounted interactive terminal record receives the IDOT and the rotation direction information that in signal, comprise; Another according to the rotation direction information of recording, the IDOT that belongs to the tire pressure monitoring unit on automobile left side wheel and the IDOT that belongs to the tire pressure monitoring unit in right side wheels are distinguished in described vehicle-mounted interactive terminal, and distinguish the vibrations of tire pressure monitoring unit reception and registration of automobile left side and the vibrations that the tire pressure monitoring unit of car right side is passed on, elapsed time interval between the vibration signal sending continuously by the tire pressure monitoring unit of automobile left side or by the tire pressure monitoring unit of car right side is also measured respectively in described vehicle-mounted interactive terminal;
Car speed in the time gap that described vehicle-mounted interactive terminal handle is measured and this time gap that sends to vehicle-mounted interactive terminal multiplies each other, and check this length of drawing of multiplying each other whether consistent with a given wheelbase of automobile within the scope of a specification error, for two wheel shafts of automobile during to overtake, if this assay is consistent, be assigned to the left side that lays respectively on wheel shaft forward in described two wheel shafts or the wheel on right side including in continuous recording two vibration signals in automobile left side or right side IDOT in first signal, and include in continuous recording two vibration signals of automobile left side or right side that IDOT in the signal of second is assigned on the wheel shaft after leaning in described two wheel shafts and with the same side of described forward wheel shaft on wheel.
7. a method as claimed in claim 6, during travelling backward, occur on the wheel shaft after first in two vibrations of automobile the same side leans on described in being assigned in a time interval, thereafter the vibrations that occur are assigned on described forward wheel shaft, and described time interval equals described wheelbase divided by moving velocity.
8. a method as claimed in claim 6, when two vibration signals are recorded in described vehicle-mounted interactive terminal simultaneously, wherein show that these two vibration signals are while coming from the wheel of two different rotation directions, the IDOT launching with these two vibration signals is assigned on two wheels of same wheel shaft.
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| CN201410193406.6A CN103935196A (en) | 2014-05-08 | 2014-05-08 | Tire pressure sensing system capable of automatically configuring |
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| CN201410193406.6A CN103935196A (en) | 2014-05-08 | 2014-05-08 | Tire pressure sensing system capable of automatically configuring |
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| CN110281711B (en) * | 2019-06-21 | 2021-06-25 | 江北区和丰科技创新发展研究院 | Tire pressure detection system and method thereof |
| CN111674210A (en) * | 2020-06-23 | 2020-09-18 | 苏州驶安特汽车电子有限公司 | Tire freezing alarm system |
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