CN101311692B

CN101311692B - Tyre burst sensor and tyre burst monitoring method

Info

Publication number: CN101311692B
Application number: CN2007100349953A
Authority: CN
Inventors: 彭世益; 彭彦均
Original assignee: GUILIN SICHAO AUTO TECHNOLOGY Co Ltd
Current assignee: GUILIN SICHAO AUTO TECHNOLOGY Co Ltd
Priority date: 2007-05-25
Filing date: 2007-05-25
Publication date: 2011-08-10
Anticipated expiration: 2027-05-25
Also published as: CN101311692A

Abstract

The invention designs a tyre burst sensor, comprising a pressure sensing unit, a permanent magnet, a magnetic sensitive switch and a shell. As the displacement caused by shape changes of the pressure sensing unit under the influence of pressure differences before and after the tyre burst is adopted to change the distance between the permanent magnet and the magnetic sensitive switch, the magnetic sensitive switch can change the switching states under the influences of the permanent magnet so as to detect the tyre burst signals. The tyre burst sensor can detect the tyre burst signals at the first time of the tyre burst, which not only accords with the characteristic of strong real-time monitoring of tyre burst but also meets the requirements of the low power stable work of a detection system.

Description

A kind of sensor and flat tire monitoring method of blowing out

Technical field

The present invention relates to the tire safety monitoring technology of vehicle with the Puffer-type tire, specifically is to be used to blow out the blow out sensor and the implementation method of monitoring.

Background technology

Can be used in the air pressure detection technique of tyre in motion existing, the TPMS (tire pressure monitoring system) that adopts wireless communication mode is for to make its subsystem energy content of battery keep the working time of several years, and the TPMS subsystem detects an air pressure usually after interval 3s even the dormancy of longer time.And the occupant survives in wishing just to place on and can take safe deceleration measure timely and effectively in 2s～3s after the tyre break; If the air pressure sense cycle of TPMS subsystem is shortened to the monitoring patient 100ms (real-time minimum requirements) that blows out, then battery power consumption will improve nearly 30 times, and will reduce significantly the serviceable life of TPMS subsystem battery.Therefore, no matter existing TPMS is real-time, or mission life all can not satisfy the requirement of blowing out and detecting.

Summary of the invention

The object of the invention technology is dealt with problems and is: provide a kind of real-time, satisfy the technical scheme that low-power consumption detects the tyre explosion detecting sensor of needs, can accurately obtain signal of tyre burst in first moment that blow out by the present invention; Can make and work in the not strong TPMS subsystem of low power consumpting state, real-time and possess tyre explosion prison ability.

Technical solution of the present invention: a kind of sensor of blowing out is characterized in that: the sensor of blowing out is made up of air pressure sensing unit, permanent magnet, magnetosensitive switch and shell; The air pressure sensing unit is that inside is filled with a kind of gas at least, and the compressible or distortion of volume produces the seal chamber of displacement under gas pressure; Utilize the change of shape generation displacement under the gas pressure before and after tyre break of air pressure sensing unit, change the distance between permanent magnet and the magnetosensitive switch, make the magnetosensitive switch under the permanent magnet influence, change on off state, detect the tyre break signal.

The blow out flat tire monitoring method of sensor, it is characterized in that: the magnetosensitive switch of the sensor of blowing out is connected with the TPMS subsystem that is installed on same tire; When inflation of tire during to normal tire pressure, the air pressure sensing unit is compressed by tire pressure, drives permanent magnet and leaves the magnetosensitive switch, and the magnetosensitive switch is in and disconnects or cut-off state, export high level under the pull-up resistor effect, the TPMS subsystem enters normal operating conditions after detecting air pressure; When tyre break or leakage, the tire internal gas pressure descends, cause the condition of air pressure sensing cell compression to disappear, the air pressure sensing unit recovers form under the air pressure inside effect, drive permanent magnet near the magnetosensitive switch, make magnetosensitive switch closure or conducting output low level, the TPMS subsystem is waken up immediately, in time signal of tyre burst or tire pressure parameter is sent to master control system.

The air pressure sensing unit can be metallic bellows, metal bellows, can also be under gas pressure volume compressible or the distortion rubber pneumatic bag or other nonmetal seal chambers; The magnetosensitive switch can be a dry-reed tube switch, also can be Hall switch.

Remarkable result of the present invention is: owing to utilized the displacement that change of shape produces under the draught head effect before and after the tyre break of air pressure sensing unit, drive the relative motion between permanent magnet and the magnetosensitive switch, make the magnetosensitive switch under the permanent magnet influence, change on off state, detect the tyre break signal; The sensor of blowing out can detect signal of tyre burst in first moment that occurs blowing out, and has both met the real-time characteristics of tyre break monitoring, satisfies the requirement of the long-term low-power consumption steady operation of detection system again.

Description of drawings

Fig. 1, the Fundamentals of Sensors of blowing out figure;

Fig. 2, the passive that adopts dry-reed tube switch the to form sensor construction figure that blows out;

Fig. 3, the passive sensor of blowing out is connected electrical schematic diagram with the TPMS subsystem;

Fig. 4, the active type that adopts Hall switch the to form sensor construction figure that blows out;

Fig. 5, the active type sensor of blowing out is connected electrical schematic diagram with the TPMS subsystem.

Embodiment

Below in conjunction with Fig. 1, Fig. 2, Fig. 3, the blow out embodiment of the invention 1 of sensor of the passive that adopts dry-reed tube switch is described in detail.

As shown in Figure 1, air pressure sensing unit 1 adopts the inner sealing metal corrugated tube 1a that is filled with certain gas-pressure nitrogen, one end of metallic bellows 1a axis is installed in shell, the other end of metallic bellows 1a axis is installed permanent magnet 2, and the magnetic field N of permanent magnet 2-S direction is parallel with dry-reed tube switch 3a length direction; Dry-reed tube switch 3a, be installed in shell 4, can drive along axis under permanent magnet 2 displacements at metallic bellows 1a, change the position that the A-B end of dry-reed tube switch 3a is closed or disconnect, the pcb board 41 of shell 4 is used for being connected of insulation between dry-reed tube switch 3a and the shell 4 and signal output apparatus.

The sensor of blowing out is connected (see figure 3) with TPMS subsystem in being installed on same tire, and the A of dry-reed tube switch 3a, B end is connected with INT, the GND of TPMS subsystem respectively.When tire was not inflated, metallic bellows 1a was subjected to make permanent magnet 2 near dry-reed tube switch 3a under its air pressure inside P effect, and the A-B end of dry-reed tube switch 3a is closed under permanent magnet 2 influence of magnetic field; This moment, the TPMS subsystem did not enter the air pressure testing process as yet, and the low level that the closure of A-B is caused does not respond; When inflation of tire during to normal tire pressure, metallic bellows 1a is compressed by tire pressure, drive permanent magnet 2 and leave the zone that influences dry-reed tube switch 3a, the A-B of dry-reed tube switch 3a disconnects, the TPMS subsystem enters duty after detecting air pressure, by detecting a tire parameter after every dormancy 3s or longer time; When tyre break or leakage occurring, cause the compressed condition of metallic bellows 1a to disappear, metallic bellows 1a recovers form under air pressure inside P effect, drive permanent magnet 2 near dry-reed tube switch 3a, A-B end closed output low level under permanent magnet 2 influence of magnetic field of dry-reed tube switch 3a, make the TPMS subsystem after response INT look-at-me, be waken up immediately, in time signal of tyre burst and tire pressure parameter are sent to master control system with wireless mode, provide information for master control system takes safety measures.

Below in conjunction with Fig. 1, Fig. 4, Fig. 5, the active type of the employing Hall switch of the present invention sensor embodiment 2 that blows out is described in detail.

Among the embodiment 2, the air pressure sensing unit adopts inner sealing metal bellows 1b axis one end that is filled with certain gas-pressure nitrogen to be installed in shell 4, and the other end is installed permanent magnet 2, and the magnetic field N of permanent magnet 2-S direction is consistent with the axis direction of metal bellows 1b; The magnetosensitive switch is selected the little power consumption Hall switch of A3212 type 3b for use, be installed in shell 4 and can drive the position that permanent magnet 2 displacements change " opening " or " pass " state along axis at metal bellows 1b, the pcb board 41 of shell 4 is used for being connected of insulation between Hall switch 3b and the shell 4 and signal output apparatus.

The sensor of blowing out is connected (see figure 5) with TPMS subsystem in being installed on same tire, and the SUP of Hall switch 3b, OUT, GND are connected with VCC, INT, the GND of TPMS subsystem.When tire was not inflated, metal bellows 1b was subjected to make permanent magnet 2 near Hall switch 3b, Hall switch 3b conducting under permanent magnet 2 influence of magnetic field, OUT output low level under its air pressure inside P effect; This moment, the TPMS subsystem did not enter the air pressure testing process as yet, and the low level that OUT is exported does not respond; When inflation of tire during to normal tire pressure, metal bellows 1b is subjected to tire pressure to influence compression, drives permanent magnet 2 and leaves the zone that influences Hall switch 3b, and Hall switch 3b ends, and OUT exports high level, and the TPMS subsystem enters duty after detecting air pressure.By detecting a tire parameter after every dormancy 3s or longer time; When the quick-fried or leakage of tire occurring, cause the compressed condition of metal bellows 1b to disappear, metal bellows 1b recovers form under air pressure inside P effect, drive permanent magnet 2 near Hall switch 3b, the OUT of Hall switch 3b is output low level under the influence of permanent magnet 2, make the TPMS subsystem after response INT look-at-me, be waken up immediately, in time signal of tyre burst and tire pressure parameter are sent to master control system with wireless mode, provide information for master control system takes safety measures.

Claims

1. the flat tire monitoring method of the sensor of blowing out, the described sensor of blowing out is made up of air pressure sensing unit, permanent magnet, magnetosensitive switch and shell; Described air pressure sensing unit adopts inner sealing metal corrugated tube or the metal bellows that is filled with a kind of gas at least; Utilize the change of shape generation displacement under the gas pressure before and after tyre break of described air pressure sensing unit, change the distance between permanent magnet and the magnetosensitive switch, make the magnetosensitive switch under the permanent magnet influence, change on off state, detect the tyre break signal; It is characterized in that: the magnetosensitive switch of the described sensor of blowing out is connected with the TPMS subsystem that is installed on same tire; When tire was not inflated, the air pressure sensing unit was subjected to make permanent magnet near the magnetosensitive switch under its air pressure inside effect, and the magnetosensitive switch is closed under the magnetic field of permanent magnet influence; This moment, the TPMS subsystem did not enter the air pressure testing process as yet, and the low level that the closure of magnetosensitive switch is caused does not respond; When inflation of tire during to normal tire pressure, the air pressure sensing unit is compressed by tire pressure, drives permanent magnet and leaves the magnetosensitive switch, and the magnetosensitive switch is in and disconnects or cut-off state, export high level under the pull-up resistor effect, the TPMS subsystem enters normal operating conditions after detecting air pressure; When tyre break or leakage, the tire internal gas pressure descends, cause the condition of air pressure sensing cell compression to disappear, the air pressure sensing unit recovers form under the air pressure inside effect, drive permanent magnet near the magnetosensitive switch, make magnetosensitive switch closure or conducting output low level, the TPMS subsystem is waken up immediately, in time signal of tyre burst or tire pressure parameter is sent to master control system.