A kind of passive tyre pressure monitoring system based on integrated pressure sensor
Technical field
This utility model relates to a kind of tire pressure monitoring system, particularly relates to a kind of passive tire based on integrated pressure sensor
Pressure monitoring system, belongs to intelligent tire monitoring technical field.
Background technology
According to the investigation that SAE is nearest, the tire fault of annual 75% is due to tire seepage or inflation
Deficiency causes.Adding up according to the Ministry of Public Security, the vehicle accident occurred on China Expressway has 70% to cause owing to blowing out,
80% then it is up in this ratio of the U.S..How to prevent blows out becomes an important topic of safe driving.
Pressure transducer is the sensor that pressure is converted to signal of telecommunication output.Generally the electrical measurement in pressure measuring instruments
Formula instrument is referred to as pressure transducer.Pressure transducer is typically by elastic sensing element and displacement sensing element (or strain gauge) group
Become.The effect of elastic sensing element is to make to be acted on certain area by measuring pressure and be converted to displacement or strain, then by position
Move sensing element or strain gauge is converted to become with pressure the signal of telecommunication of certain relation.Sometimes the function of both elements is combined in one
Body.Pressure transducer is widely used in various industry automatic control environment, relates to water conservancy and hydropower, railway traffic, intelligent building, production certainly
Numerous industries such as control, Aero-Space, military project, petrochemical industry, oil well, electric power, boats and ships, lathe, pipeline.
At present, system for monitoring pressure in tyre mainly has two kinds of solutions, immediate system and indirect system.Direct-type tire
Pressure monitor system is to utilize to be arranged on each pressure transducer taking turns tyre cavity and directly measure the air pressure of tire, and to each tire
Air pressure carries out showing and monitoring, and when tire pressure is the lowest or has seepage, system can automatic alarm.Indirect type monitoring tire pressure
System is the rotating speed difference that the wheel speed sensors by automobile ABS system comes between comparative tire, to reach to monitor the mesh of tire pressure
, the major defect of the type system is: 1. can not demonstrate the most instantaneous atmospheric pressure value of each tires;The most same axletree or
The same side wheel or all tire air pressure can not be reported to the police when declining simultaneously;3. can not take into account simultaneously speed, accuracy of detection etc. because of
Element.
For improving the reliability of system, sensor preferably carries out passive detection, and research shows, utilizes tire air pressure sensor
The information that device is collected, can carry out malfunction monitoring to vehicle suspension system and correct navigation system.So, following sensor
It should be the passive intelligent type sensor integrating various function.
Utility model content
Technical problem to be solved in the utility model is that the deficiency for background technology provides one based on integrated pressure
The passive tyre pressure monitoring system of force transducer.
This utility model is for solving above-mentioned technical problem by the following technical solutions:
A kind of passive tyre pressure monitoring system based on integrated pressure sensor, comprises vehicle-mounted receiver module and connected
For detecting the data acquisition module of tire parameter, described data acquisition module comprises Pressure/Temperature integrated sensor, control
Device module, A/D changer, amplifier module, wireless communication module and power module, described wireless communication module comprises MCU mould
Block and connected radiofrequency launcher, described Pressure/Temperature integrated sensor passes sequentially through A/D changer, amplifier mould
Block connect controller module, described controller module by being connected radiofrequency launcher with MCU module, described power module respectively with
Pressure/Temperature integrated sensor, controller module, A/D changer, amplifier module, wireless communication module connect, and are used for providing
Required electricity;Described vehicle-mounted receiver module comprises data processing module and connected radio frequency receiver, LED show mould respectively
Block and alarm module.
Further preferred side as a kind of passive tyre pressure monitoring system based on integrated pressure sensor of this utility model
Case, described Pressure/Temperature integrated sensor comprises piezoresistive pressure sensor and temperature sensor two parts.
Further preferred side as a kind of passive tyre pressure monitoring system based on integrated pressure sensor of this utility model
Case, described radiofrequency launcher uses the MC33594 chip of Motorola.
Further preferred side as a kind of passive tyre pressure monitoring system based on integrated pressure sensor of this utility model
Case, described radio frequency receiver uses MC33493 chip.
Further preferred side as a kind of passive tyre pressure monitoring system based on integrated pressure sensor of this utility model
Case, described MCU module, controller module and data processing module all use the MC9S08AW16 single-chip microcomputer of Motorola.
Further preferred side as a kind of passive tyre pressure monitoring system based on integrated pressure sensor of this utility model
Case, described amplifier mould comprises amplifier chip, the first resistance, the second resistance, the 3rd resistance, the outfan of A/D changer soon
Connecting the first resistance and one end of the second resistance respectively, the other end of the second resistance connects the positive pole of amplifier chip, amplifier
With the other end ground connection of the first resistance after the negative pole of chip and the 3rd resistant series, the voltage output end of amplifier chip connects control
The input of device processed.
This utility model uses above technical scheme compared with prior art, has following technical effect that
1, this utility model uses the passive tyre pressure monitoring system of a kind of integrated pressure sensor, collection temperature acquisition and pressure
Acquisition function passive intelligent type sensor can detect the pressure parameter of tire in real time and be uploaded to vehicle-mounted receiver module,
Effectively improve the stability of detecting system, improve the degree of accuracy of detection further;
2, vehicle-mounted receiver module of the present utility model is provided with LED and shows and alarm module is easy to car owner and is understood tire at any time
Situation, when tire pressure too high or too low time, by LED display module and alarm module alert, effectively keep away
The vehicle accident that exempting from blows out causes.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present utility model;
Fig. 2 is the structure principle chart of this utility model data acquisition module;
Fig. 3 is the structure principle chart of the vehicle-mounted receiver module of this utility model;
Fig. 4 is the amplifier mould fast-circuit figure of this utility model data acquisition module.
Detailed description of the invention
Below in conjunction with the accompanying drawings the technical solution of the utility model is described in further detail:
As it is shown in figure 1, a kind of passive tyre pressure monitoring system based on integrated pressure sensor, comprise vehicle-mounted receiver module with
And the connected data acquisition module for detecting tire parameter.Integrate temperature acquisition and the nothing of pressure acquisition function
Source Intelligence sensor can detect the pressure parameter of tire in real time and be uploaded to vehicle-mounted receiver module, effectively improves detection system
The stability of system, improves the degree of accuracy of detection further;Vehicle-mounted receiver module of the present utility model is provided with LED and shows and report to the police
Module is easy to car owner and is understood the situation of tire at any time, when tire pressure too high or too low time, by LED display module and warning
Module alert, the vehicle accident that being effectively prevented from blows out causes.
As in figure 2 it is shown, described data acquisition module comprises Pressure/Temperature integrated sensor, controller module, A/D conversion
Device, amplifier module, wireless communication module and power module, described wireless communication module comprises MCU module and connected
Radiofrequency launcher, described Pressure/Temperature integrated sensor pass sequentially through A/D changer, amplifier module connect controller mould
Block, described controller module by being connected radiofrequency launcher with MCU module, and described power module is integrated with Pressure/Temperature respectively
Sensor, controller module, A/D changer, amplifier module, wireless communication module connect, and are used for providing required electricity;
As it is shown on figure 3, described vehicle-mounted receiver module comprises data processing module and the connected radio frequency reception of difference
Device, LED display module and alarm module.
Operation principle: data acquisition module block assembly in tire, pressure and temperature sensor detection inside tires is current
Stress and temperature information, it is thus achieved that analogue signal be converted into digital signal through A/D changer, through amplifier module amplify
Transmit after process and carry out pretreatment to controller module, be then transmit to MCU module and sent by radiofrequency launcher.Vehicle-mounted
Receiver module device is in driver's cabin, and radio frequency receiver receives the stress from tire module and temperature information, works as tire pressure
Too high or too low time, by LED display module and alarm module alert.
At vehicle-mounted receiver module, radio frequency reception decoding chip uses the MC33594 chip of Motorola, and this chip is and penetrates
Frequently the radiofrequency receiving chip that transmitting chip MC33493 chip is supporting, its running voltage is 5 V.Controller uses Motorola
MC9S08AW16 single-chip microcomputer, the kernel of this chip is S08, as can using with the single-chip microcomputer MC6S08QG8 of tire module
Development environment, additionally this chip is that 5 V power, compatible with radiofrequency receiving chip and LCD display chip level.
Pressure transducer and temperature sensor are the critical components of tire pressure monitoring system, design and made a kind of newly
Type sensor, it comprises piezoresistive pressure sensor and temperature sensor two parts.
Wherein, piezoresistive pressure sensor, mainly by the piezoresistive effect of quasiconductor, is made in a Wheatstone bridge
On one silicon cup, deforming upon after silicon cup is under pressure, four arm resistances of Wheatstone bridge will change, and breaks
The electric equilibrium of electric bridge, thus have the output of a signal of telecommunication.
Temperature sensor uses single electric resistance structure, makes a p-type resistance on n-type silicon substrate.Prisoner injects resistance for p-type
Having a positive temperature coefficient, when the temperature varies, the resistance of resistance will occur to change accordingly.By to resistance with
Current source supply, it is possible to detect the change of temperature by measuring ohmically voltage.
As shown in Figure 4, described amplifier mould comprises amplifier chip, the first resistance, the second resistance, the 3rd resistance, A/D soon
The outfan of changer connects the first resistance and one end of the second resistance respectively, and the other end of the second resistance connects amplifier chip
Positive pole, with the other end ground connection of the first resistance after the negative pole of amplifier chip and the 3rd resistant series, the electricity of amplifier chip
Pressure outfan connects the input of controller.
In sum, this utility model uses the passive tyre pressure monitoring system of a kind of integrated pressure sensor, collection temperature to adopt
Integrate the passive intelligent type sensor with pressure acquisition function can detect the pressure parameter of tire in real time and be uploaded to vehicle-mounted
Receiver module, effectively improves the stability of detecting system, improves the degree of accuracy of detection further;Car of the present utility model
Carry receiver module to be provided with LED and show and alarm module is easy to car owner and is understood the situation of tire at any time, when tire pressure is too high or
Time too low, by LED display module and alarm module alert, the vehicle accident that being effectively prevented from blows out causes.
It is understood that unless otherwise defined, all terms used herein (include skill to those skilled in the art of the present technique
Art term and scientific terminology) have with the those of ordinary skill in this utility model art be commonly understood by identical meaning
Justice.Should also be understood that those terms defined in such as general dictionary should be understood that have with prior art upper
The meaning that meaning hereinafter is consistent, and unless defined as here, will not come by idealization or the most formal implication
Explain.
Above example only illustrates technological thought of the present utility model, it is impossible to limit protection model of the present utility model with this
Enclose, every according to the technological thought that the utility model proposes, any change done on the basis of technical scheme, each fall within this reality
Within the scope of novel protected.Above in conjunction with accompanying drawing, embodiment of the present utility model is explained in detail, but this practicality
Novel it is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art are possessed, it is also possible to or else take off
Make a variety of changes on the premise of this utility model objective.