CN202573667U

CN202573667U - Novel tire pressure monitoring system

Info

Publication number: CN202573667U
Application number: CN 201220121326
Authority: CN
Inventors: 朱兵; 祝燕; 董连飞
Original assignee: Shanghai Hangsheng Industry Co Ltd
Current assignee: Shanghai Hangsheng Industry Co Ltd
Priority date: 2012-03-27
Filing date: 2012-03-27
Publication date: 2012-12-05
Anticipated expiration: 2022-03-27

Abstract

The utility model discloses a novel tire pressure monitoring system. The novel tire pressure monitoring system comprises an antenna, a low noise amplifying unit, a filtering unit, a radio frequency chip, a power supply and control and output unit as well as a voltage stabilizing unit, wherein the antenna, the low noise amplifying unit, the filtering unit, the radio frequency chip, the power supply and control and output unit as well as the voltage stabilizing unit are connected with each other in sequence. According to the utility mode, problems in the prior art can be effectively solved.

Description

A kind of novel tire pressure monitor system

Technical field:

The utility model relates to a kind of detection supervisory system of tire pressure, and particularly a kind of tire pressure detects the radio receiver in the supervisory system.

Background technology:

In the process of galloping, tire fault is that all drivers worry and the most difficult prevention the most, also is the major reason that sudden traffic accident takes place.According to statistics, the traffic accident that on Chinese express highway, takes place has 70% to cause by blowing out, in this ratio of the U.S. then up to 80%.And the reason that causes blowing out is the problem of the pressure of tire own mostly; Tire receives the external force influence or the variation of weather of environment in the midium or long term of going; And then causing the wearing and tearing and the distortion of tire itself, these factors all can have influence on the pressure of tire and the safety of driving.In addition, when driving inflation not at that time, the pressure that also can influence inside tires changes.Because the carelessness of driving is not done suitable tire maintenance or is used tire gauge to check the pressure condition of tire, so the contingency that regular meeting blows out in vehicle ' on time.Moreover, keep normal pressure of tire can also save the consumption of oil mass.Therefore, the tire pressure of wheel type vehicle detects of crucial importance for the safety of vehicle '.

How preventing to blow out becomes an important topic of safe driving, and the tyre pressure that maintains the standard goes and in time find that tire gas leakage is to prevent the key of blowing out.Under this background, tire inflation pressure determining system arises at the historic moment.Tire inflation pressure determining system is also referred to as TPMS (Tire Pressure Monitoring System), is mainly used in when running car tire pressure is monitored automatically, and tire flat and infrabar are reported to the police.This system is made up of feedway and receiving device.Feedway comprises the sensor that is placed in the tire, is used to detect the suffered pressure of tire, and sensor links to each other with emitting antenna through circuit, and sensor and interlock circuit are made a pcb board; Emitting antenna is vertically mounted on and is used to send detection signal on the pcb board.Receiving device is used to receive detection signal, so that when tire pressure generation ANOMALOUS VARIATIONS, remind the driver.Emitting antenna adopts helical antenna usually.Because the height of existing feedway depends on the length of emitting antenna, and narrow space in the tire, for avoiding running into tire inner wall, existing generating means has to adopt the lower short antenna of gain, and this has just seriously limited the raising of RF signal strength.Simultaneously existing receiving device adopts common 433.92MHz wireless receiving module, and it is mainly used in various wireless remote-control systems, like garage door wireless control system, all kinds of anti-theft system, industrial remote control, remote measurement, remote sensing.The modulation system that adopts generally is FSK or ASK.Because of these wireless receiving modules exist the low weakness of sensitivity, in TPMS or RKE system, will be difficult to receive signal as if these modules of employing.

The utility model content:

The utility model to the 433.92MHz wireless receiving module receiving sensitivity that adopts in the existing system for monitoring pressure in tyre low (general less than-100dBm); Can not satisfy the needs of TPMS and RKE product, and a kind of highly sensitive, antijamming capability is strong and integrated level is high system for monitoring pressure in tyre is provided.

In order to achieve the above object, the utility model adopts following technical scheme:

A kind of novel tire pressure monitor system; Said monitoring system comprises antenna, LNA big unit, filter unit, radio frequency chip, power supply and control and output unit and voltage regulation unit, and said antenna, LNA big unit, filter unit, radio frequency chip, power supply and control and output unit and voltage regulation unit are connected successively.

In the preferred embodiment of the utility model, said voltage regulation unit comprises that 12V changes 5V mu balanced circuit, 3V mu balanced circuit and 5V mu balanced circuit.

Further, said LNA big unit mainly is made up of chip MBC13900NT1.

Further, said radio frequency chip is TH71102.

Further, said filter unit is chip SFECV10M7KA00.

The system for monitoring pressure in tyre that obtains according to technique scheme can be good at solving existing 433.92MHz wireless receiving module receiving sensitivity low (general less than-100dBm); Can not satisfy the problem of the needs of TPMS and RKE product; It adopts high sensitivity RF chip, increases peripheral circuit, thereby designs novel 433.92MHz wireless receiving module.This module also has function of supplying power in addition, can 5V constant potential, maximum 500mA electric current be provided to other modules.The utility model has adopted low-noise amplification circuit, has improved the sensitivity of wireless receiving module; Adopt sound surface filtering circuit, reduced interference; The utility model has adopted meticulous wiring also at the pcb board design aspect.Thereby the receiving sensitivity that has realized the utility model is brought up to-110dBm, can receive the radio signal that the TPMS projector sends effectively, and under this sensitivity, the RKE system equally can effectively receive data.The utility model can also obtain power supply from automobile storage battery, ACC and instrument carrier panel backlight electric power etc. respectively according to the difference of application target.

Description of drawings:

Further specify the utility model below in conjunction with the accompanying drawing and the specific embodiment.

Fig. 1 is the system schematic of the utility model.

Fig. 2 is an interface circuit schematic diagram in the utility model.

Fig. 3 is that 12V changes 5V mu balanced circuit schematic diagram in the utility model.

Fig. 4 is a 5V mu balanced circuit schematic diagram in the utility model.

Fig. 5 is a 3V mu balanced circuit schematic diagram in the utility model.

Fig. 6 is the schematic circuit diagram of the utility model.

The specific embodiment:

For technological means, creation characteristic that the utility model is realized, reach purpose and be easy to understand understanding with effect, below in conjunction with concrete diagram, further set forth the utility model.

Referring to Fig. 1, the novel tire pressure monitor system that the utility model provides mainly comprises antenna 100, LNA big unit 200, filter unit 300, radio frequency chip 400, power supply and control and output unit 500 and voltage regulation unit (not shown).

Wherein the signal that receives of antenna 100 is transferred to radio frequency chip 400 through LNA big unit 200 and surface acoustic wave filter unit 300 successively, and this radio circuit 400 is through the power supply and the various control signal of connected power supply and control and output interface unit 500 acquisition total systems.

Referring to Fig. 2, power supply in the utility model and control and output interface unit 500 adopt two sockets, are respectively applied for functions such as power supply, control and output, power supply output.Can the realization system be used for automobile,, obtain power supply from automobile storage battery, ACC and instrument carrier panel backlight electric power etc. respectively according to the difference of application target.

In order to access stable power, the utility model adopts a plurality of constant voltage power suspplys, joins with power supply and control and output interface unit 500 respectively.

Referring to Fig. 3, it is depicted as the mu balanced circuit that 12V changes 5V, mainly is made up of chip MC7805ABDR2 and correspondent peripheral circuit.The 12V power supply is from ACC, and the 5V power supply also provides power supply to external module except that converting 3V to.

Referring to Fig. 4, it is depicted as another road 5V mu balanced circuit, mainly is made up of chip NJM78L05 and correspondent peripheral circuit.This circuit is optional circuit, and its required 12V is from automobile storage battery, and 5V outputs to external module.

Referring to Fig. 5, it is depicted as the 3V mu balanced circuit, mainly is made up of chip TPS79230 and correspondent peripheral circuit.

Based on such scheme, the practical implementation of the utility model is following:

Referring to Fig. 6, total system is connected to form by antenna socket 1, low-noise amplification circuit 2, sound surface filtering circuit 3 and radio circuit 4.

Be welded with t-antenna on the antenna socket 1, this socket is transferred to connected low-noise amplification circuit 2 with the signal that receives.

Low-noise amplification circuit 2 mainly is made up of chip MBC13900NT1 and correspondent peripheral circuit, and its chips MBC13900NT1 is an amplifying triode.Low-noise amplification circuit 2 passes to connected sound surface filtering circuit 3 with the signal of handling well and carries out filtering.

The SAW filter that sound surface filtering circuit 3 is selected for use is HDF434AS4, and this filter is no more than 2dB to the decay of central frequency.After the signal of filtering is transferred to radio circuit 4 handles.

Radio circuit 4 is made up of chip TH71102 correspondent peripheral circuit.According to operating needs, TH71102 and peripheral circuit are configured to 433.92MHz, ASK mode, and the crystal oscillator of selecting for use is 23.51222MHz, and the intermediate frequency filtering frequency range is 10.7MHz, and the model of filter is SFECV10M7KA00.

Total system is optimized processing to wiring in the pcb board design process, adopted the three ply board structure, thereby has improved antijamming capability.

More than show and described groundwork of the utility model and the advantage of principal character and the utility model.The technical personnel of the industry should be understood; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the specification sheets that the utility model just is described; Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection domain to be defined by appending claims and equivalent thereof.

Claims

1. novel tire pressure monitor system; It is characterized in that; Said monitoring system comprises antenna, LNA big unit, filter unit, radio frequency chip, power supply and control and output unit and voltage regulation unit, and said antenna, LNA big unit, filter unit, radio frequency chip, power supply and control and output unit and voltage regulation unit are connected successively.

2. a kind of novel tire pressure monitor system according to claim 1 is characterized in that, said voltage regulation unit comprises that 12V changes 5V mu balanced circuit, 3V mu balanced circuit and 5V mu balanced circuit.

3. a kind of novel tire pressure monitor system according to claim 1 is characterized in that said LNA big unit mainly is made up of chip MBC13900NT1.

4. a kind of novel tire pressure monitor system according to claim 1 is characterized in that said radio frequency chip is TH71102.

5. a kind of novel tire pressure monitor system according to claim 1 is characterized in that said filter unit is chip SFECV10M7KA00.