CN2873541Y - Automobile tire pressure monitor - Google Patents

Abstract

The utility model discloses a pressure monitoring device for automobile tires, which is characterized by a pressure monitoring module installed in the tire and a reception display warning module installed in the cabin; wherein, the pressure monitoring module mainly comprises a tire pressure transducer MPXY 8020A and a microcontroller MC68HC908RF2 with a RF dispatching chip MC33491, the reception display warning module mainly comprises a RF receiving chip MC33594, a microcontroller MC68HC908GP32, a guiding light and a LCD screen, the guiding light and the LCD screen are connected with the microcontroller MC68HC908GP32. The utility model, which solves the technique problem of the real-time monitoring for the tire pressure, has the advantages of the little error during the pressure transmission, the safe reliability, and the convenient installation and replacement.

Description

Automobile tire pressure monitor

[technical field]

The utility model relates to a kind of monitoring facilities of vehicle safety travel, what be specifically related to is the monitor unit of automotive tire pressure.

[background technology]

The English name of automotive tire pressure supervisory system is Tire Pressure Monitoring System, it abbreviates TPMS as, be mainly used in real-time tire pressure is monitored automatically when running car, tire flat and high infrabar reported to the police, with guarantee driving safety.Along with the develop rapidly of Chinese Automobile Industry ', automotive safety more and more becomes the topic that everybody pays close attention to.In the process of running at high speed of automobile, 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 takes place on Chinese express highway has 70% owing to blow out and cause, in this ratio of the U.S. then up to 80%.How to prevent to blow out and become an important topic of safe driving.According to the analysis expert at national rubber tire quality surveillance center, the tyre pressure that maintains the standard travels and in time finds that tire gas leakage is to prevent the key of blowing out.And TPMS---the vehicle tire pressure supervisory system undoubtedly will be desirable instrument.At present, TPMS mainly is divided into two types, a kind of is that Wheel-Speed Based TPMS (is called for short: WSB TPMS, or be called indirect type TPMS), this system is that the wheel speed sensors by automobile ABS system comes the rotating speed difference between the comparative tire, to reach the purpose that monitors tire pressure, the major defect of the type system is that the situation that can't surpass 100 kilometers/hour to the situation and the speed of two above tires while deficencys is judged.Another kind is that Pressure-Sensor Based TPMS (is called for short: PSB TPMS, or be called direct-type TPMS), this system utilizes to be installed in the air pressure that each pressure sensor of taking turns tyre cavity is directly measured tire, and each tire pressure shown and monitor, too low or when seepage was arranged, system can auto alarm when tire pressure.PSB TPMS all is better than WSB TPMS on function and performance.In this motor tire monitoring system, how to make its safe reliability height, the operating efficiency of automobile is improved, oil consumption reduces, and selects the execution unit in this system just to become key.

[utility model content]

Problem in view of TPMS existence in the prior art, the technical problems to be solved in the utility model provides a kind of automobile tire pressure monitor, it can detect the pressure and temperature of motor tire in real time, utilization acousto-optic mode reminds chaufeur to note automotive tire pressure and temperature conditions, the situation that prevents to blow out takes place, and can improve automotive operation efficient, reduction oil consumption.

In order to solve the problems of the technologies described above, the utility model takes following mode to realize: a kind of automobile tire pressure monitor, it is characterized in that: comprise being installed in the monitoring tire pressure module in the tire and being installed in the indoor reception display alarm module of vehicle drive that described monitoring tire pressure module is mainly by tire pressure sensor MPXY8020A and include the microcontroller MC68HC908RF2 that radio frequency sends chip MC33491 and form; Described reception display alarm module mainly is made up of radiofrequency receiving chip MC33594, microcontroller MC68HC908GP32, indicator lamp and LCDs; Described indicator lamp is connected with microcontroller MC68HC908GP32 with LCDs; Described microcontroller MC68HC908GP32 is connected with PC by serial ports.

The utility model has solved the technical matters that automotive tire pressure is monitored in real time, and not only the transmission of pressure error is little, and is safe and reliable, and installs and change conveniently; And improved the operating efficiency of automobile, reduced oil consumption, selected the chip of above-mentioned these models, the reliability and the safety that have improved monitoring device more.

[description of drawings]

Further describe its implementation detail below more in conjunction with the accompanying drawings.

Fig. 1 is a work scheme drawing of the present utility model;

Fig. 2 is the hardware connection diagram of the utility model pressure monitoring module;

Fig. 3 receives the hardware connection diagram of display alarm module for the utility model.

[specific embodiment]

In conjunction with Fig. 1, Fig. 2 and Fig. 3, this automobile tire pressure monitor, comprise being installed in the monitoring tire pressure module in the tire and being installed in the indoor reception display alarm module of vehicle drive that described monitoring tire pressure module is mainly by tire pressure sensor MPXY8020A and include the microcontroller MC68HC908RF2 that radio frequency sends chip MC33491 and form; Pressure monitoring module is by the 3.6V lithium battery power supply; Tire pressure sensor can also detect the temperature in the tire except can detected pressures.Radio frequency sends the work microcontroller MC68HC908RF2 control fully again of chip MC33491, need set its frequency of operation and pattern during its work, thus the transmission of control data.Because the restriction of tire working condition, tire module must can continue a long time normal operation, thereby the element in the tire module all should be selected the low-power consumption element for use; For tire pressure sensor MPXY8020A, the pressure and temperature measurement is the energy consumption parameter of a key, as long as so in the time providing enough tire pressure warning information, should reduce the frequency of measurement to chaufeur as far as possible, so that tire pressure sensor MPXY8020A most of the time in its life cycle is in idle pulley.Described reception display alarm module mainly is made up of radiofrequency receiving chip MC33594, microcontroller MC68HC908GP32, indicator lamp and LCDs; Described indicator lamp is connected with microcontroller MC68HC908GP32 with LCDs.The contact method of described monitoring tire pressure module and reception display alarm module sends the wireless transmission method of chip MC33491 and radiofrequency receiving chip MC33594 with radio frequency, when tire pressure sensor MPXY8020A is in idle pulley, tire pressure sensor MPXY8020A sent one in per three seconds and wakes (wake-up) pulse up, this wakes pulse up and links to each other with a keyboard interrupt pin on the microcontroller MC68HC908RF2, and microcontroller MC68HC908RF2 is each to come to measure tire pressure and temperature once waking up.If the value that microcontroller MC68HC908RF2 receives is new maximum or a minimum value in the transmission cycle, it just deposits this value in RAM.Microcontroller MC68HC908RF2 after having checked the in-to-in voltage detecting circuit, the tire pressure maxim of this monitoring tire pressure module analysis storage and the difference between minimum value.When if this difference has surpassed the maximum difference that is stored among the ROM, module just enters quick sending mode; Under quick sending mode, its every interval 800 to 900ms sends 1 Frame, and circulation sends 255 times.This has increased greatly and has received the possibility that the display alarm module is received data, is that tire leaks gas fast if big force value changes indication, then sends alarm and allows chaufeur emergency in a time enough.Receive the display alarm module and can be installed on the car panel, inform chaufeur by indicator lamp flicker or liquid crystal display, whether pressure that each tire of vehicle is current and temperature regime be unusual.As shown in Figure 3, radiofrequency receiving chip MC33594 need be configured the control register of radiofrequency receiving chip earlier by microcontroller MC68HC908GP32 before the beginning received signal, and it is operated under the 434MHzFSK pattern.In this process, microcontroller MC68HC908GP32 is a main frame, and radiofrequency receiving chip MC33594 is a slave, and the communication between two machines can realize by the SPI functions of modules of microcontroller.Finish after the configuration, it is main frame that radiofrequency receiving chip MC33594 is set, and all indicator lamps inform once that with regard to flicker user's module is ready; Microcontroller MC68HC908GP32 then becomes slave.Radiofrequency receiving chip MC33594 is behind the rf data of the MANCHESTER coding that receives the pressure monitoring module transmission, and the serial data that converts it into Transistor-Transistor Logic level is exported from the MOSI mouth, and exports clock synchronously on the SCLK mouth.Like this, microcontroller MC68HC908GP32 just can read rf data exactly by clock signal.After receiving a Frame, will recomputate verification and compare with the Frame that has received.Frame is through after confirming, the pairing ID of certain tire then will compare with 4 ID values that are stored in the microcontroller MC68HC908GP32 memory device.If find an ID who matches, then data are with regard to processed driving LCD and light corresponding indicator lamp.Described microcontroller MC68HC908GP32 is connected with PC by serial ports; Can be used for upgrading the limit value of tire pressure and temperature and revise tire ID number, and carry out the real-time monitoring of state.

Claims (2)

1, a kind of automobile tire pressure monitor, it is characterized in that: comprise being installed in the monitoring tire pressure module in the tire and being installed in the indoor reception display alarm module of vehicle drive that described monitoring tire pressure module is mainly by tire pressure sensor MPXY8020A and include the microcontroller MC68HC908RF2 that radio frequency sends chip MC33491 and form; Described reception display alarm module mainly is made up of radiofrequency receiving chip MC33594, microcontroller MC68HC908GP32, indicator lamp and LCDs; Described indicator lamp is connected with microcontroller MC68HC908GP32 with LCDs.

2, a kind of automobile tire pressure monitor according to claim 1 is characterized in that described microcontroller MC68HC908GP32 is connected with PC by serial ports.

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