CN1092330C - Radio tyre-pressure detector - Google Patents
Radio tyre-pressure detector Download PDFInfo
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- CN1092330C CN1092330C CN 98125224 CN98125224A CN1092330C CN 1092330 C CN1092330 C CN 1092330C CN 98125224 CN98125224 CN 98125224 CN 98125224 A CN98125224 A CN 98125224A CN 1092330 C CN1092330 C CN 1092330C
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- tire
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- pressure
- tire pressure
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Abstract
The present invention relates to a wireless tyre pressure detector. The detector comprises a tyre pressure detection transmitter and a correspondent tyre pressure receiver, wherein the tyre pressure detection transmitter comprises a power supply unit, a pressure sensing unit and a transmitting circuit, a vibration power generating device of the power supply unit is composed of a piezoelectric element, an elastic sheet and a weight block, the pressure sensing unit comprises a capacitance device composed of a pneumatic member, a conductive member and a conversion circuit, and the pneumatic member and conductive member are arranged in preset spacing distance. When the pneumatic component is shifted by tyre pressure, the capacitance value is changed, the RC oscillation waveform of an oscillating loop is detected by the conversion circuit, a first signal is output, and a second signal is transmitted by the transmitting circuit.
Description
The present invention relates to a kind of radio tire-pressure detector, particularly relate to and a kind ofly have and can generate electricity voluntarily, but and short distance reception show the radio tire-pressure detector of tire pressure situation.
Tire pressure detection device mainly is mounted on the vehicle, in order to the tire pressure value of sensing tire whether in normal scope, it comprises a radiating circuit and a receiving circuit, this radiating circuit is arranged in the tire pressure detector, and this receiving circuit is configurable on the Vehicular instrument panel or near it, so that observe.When the pressure of tire value that this tire pressure detector measures non-in normal range, when just the tire pressure value is too high or too low, this radiating circuit can be sent with wireless signal, and receive and recognize the source of radio signal by this receiving circuit, and demonstrate or can give the alarm in good time, the driver just can be that the tire pressure of that tire or that tire is too high or too low actually.Receiving circuit in the past is to be configured in the vehicle, so required power supply is to use vehicle power supply during the running of this receiving circuit, and required power supply is to use the electric battery that is installed in this tire pressure detector during this radiating circuit running.So, when battery power exhausts, the battery that must will more renew, just can make the radiating circuit normal operation of this tire pressure detector, to bring into play its due function, therefore, increased the expenditure of driver's expense, and, the inconvenience that is caused when changing electric battery increased.
Artificial this problem that solves of invention once proposes No. 98106063.3 patent application case to Patent Office of the People's Republic of China and generates electricity voluntarily with the piezoelectric element of a vibration generating device, and detects tire pressure by the LC oscillation circuit that pneumatic, a magnetic core stick and an inductive coil are formed.But the part unit price cost of the inductive coil of this LC oscillation circuit, magnetic core stick is more expensive, and assembly cost is higher.
The objective of the invention is to propose a kind of radio tire-pressure detector of being formed by tire pressure detection transmitter and tire pressure receiver, and the tire pressure detection transmitter comprises power supply unit, pressure-sensing unit and radiating circuit, it has the interference that can reduce the signal transmission and improves the degree of stability that transmits, and have power saving, characteristics easy to use, thereby solved the existing in prior technology problem.
The technical solution adopted in the present invention is: comprise a plurality ofly can be installed in tire pressure detection transmitter on the tire respectively, at least one is corresponding with this tire pressure detection transmitter and can be installed in a tire pressure receiver on the car body and a control module; This tire pressure detection transmitter comprises a housing, is provided with a power supply unit, a pressure-sensing unit and a radiating circuit in this housing, it is characterized in that: this power supply unit comprises a vibration generating device and a rectification circuit; This vibration generating device comprises a piezoelectric element, a shell fragment and a pouring weight, this piezoelectric element is located on this shell fragment, and draw power supply by this piezoelectric element, at this shell fragment one end this pouring weight is set, when tyre rotation, make this shell fragment vibration, and act on this piezoelectric element and produce a power supply by the vibration force of this shell fragment, this power supply provides a power supply to this pressure-sensing unit and this radiating circuit after this rectification circuit rectification; This pressure-sensing unit comprises a capacitive means, and this capacitive means comprises one pneumatic, one electric-conductor and a change-over circuit; This pneumatic is that conductive material is made, and becomes predetermined space apart from setting with this electric-conductor; When the pressure of tire that is entered is passed, this pneumatic distance with this electric-conductor changed, it can change the capacitance of this capacitive means; This change-over circuit comprises an oscillation circuit, and this capacitive means is connected on this oscillation circuit, so that change-over circuit can be detected the RC waveform number of times that this oscillation circuit produces, and first signal output that produces an expression tire pressure numerical value; This radiating circuit receives first signal from this pressure-sensing unit, and sends a wireless secondary signal; These tire pressure receivers receive the secondary signal that corresponding this tire pressure detection transmitter is launched, and export one the 3rd signal; This control module comprises a control circuit and an indicating circuit, and this control circuit is to receive the 3rd signal, and via producing an indicator signal after the microprocessor processes.
Said pneumatic comprises an air chamber, and the side of air chamber forms a plurality of wrinkle Zhe, and top and bottom have an end face and an opening respectively.
Said pneumatic is a shell fragment, and the surface has a plurality of wrinkle Zhe, forms an end face and a bottom surface respectively below thereon.
Said tire pressure receiver and tire pressure detection transmitter, its quantity is corresponding, and each tire pressure receiver is installed in the car body place near each tire respectively, the secondary signal of being launched with tire pressure detection transmitter corresponding on the short distance reception adjacent tires.
Said power supply unit also is provided with a standby power supply device.
Said standby power supply device is a rechargeable device.
Said power supply unit, it also is provided with a booster circuit.
Said power supply unit, it also is provided with a power-saving control circuit.
Said pneumatic is that flexible materials is made.
Said tire pressure receiver, it respectively comprises a receiving antenna, a high-frequency amplifier circuit, a detecting circuit, a low-frequency amplifier circuit and a comparer, after this secondary signal receives via this receiving antenna, through this high-frequency amplifier circuit, this detecting circuit, this low-frequency amplifier circuit handle a signal, and after doing wave shaping by this comparer, the 3rd signal of tire pressure value is represented in output.
In sum, the present invention has the following advantages:
1, the present invention adopts automatic oscillatory type Blast Furnace Top Gas Recovery Turbine Unit (TRT), so long service life can be guaranteed can not lack power supply after car starts.
2, the present invention detects tire pressure and obtains accurate tire pressure numerical value in the electronic induction mode, make the driver have concrete numeral to know the situation of tire, can do in advance adjustment by the tire pressure numerical value that shows for some special situations (as the long distance time range of driving, high hot road surface etc.), and observe at any time under steam, can be more prone to grasp the tire pressure situation of tire, doing in good time adjustment, and improve traveling security.
3, be to adopt closely that mode is provided with between radio tire-pressure detector 1 of the present invention and the tire pressure receiver 5, and because these tire pressure receiver 5 range of receiving are less, therefore wave interference that the electric system that receives car launches can be reduced or other are equipped with the interference of other vehicles of tire pressure detector equally, and good received signal can be obtained.
Fig. 1 is the device synoptic diagram of first embodiment of the invention.
Fig. 2 is a first embodiment of the invention tire pressure detection transmitter combinations cut-open view.
Fig. 3 is a first embodiment of the invention tire pressure detection transmitter square synoptic diagram.
Fig. 4 is first embodiment of the invention rectification circuit and booster circuit circuit diagram.
Fig. 5 is a first embodiment of the invention pressure-sensing unit three-dimensional structure diagram.
Fig. 6 is a first embodiment of the invention pressure-sensing unit combination cut-open view.
Fig. 7 is the block schematic diagram of first embodiment of the invention tire pressure receiver.
Fig. 8 is the circuit diagram of first embodiment of the invention tire pressure receiver.
Fig. 9 is the block schematic diagram of first embodiment of the invention control module.
Figure 10 is a second embodiment of the invention pressure-sensing unit combination cut-open view.
Figure 11 is a third embodiment of the invention pressure-sensing unit combination cut-open view.
Figure 12 is a fourth embodiment of the invention pressure-sensing unit combination cut-open view.
Figure 13 is a fifth embodiment of the invention pressure-sensing unit combination cut-open view.
Figure 14 is the fixing elastomeric belt body synoptic diagram of usefulness of the present invention.
Figure 15 is installed in synoptic diagram on the steel ring in the tire for mat elastomeric belt body of the present invention with the tire pressure detection transmitter.
Figure 16 is the synoptic diagram of tire pressure detection transmitter of the present invention with the location pedestal.
Figure 17 makes the tire pressure detection transmitter be installed in synoptic diagram on the steel ring in the tire for the present invention with the location pedestal.
Further specify preferred embodiment of the present invention in conjunction with above-mentioned each accompanying drawing now.As shown in Figure 1, it is the first embodiment of the present invention, comprises tire pressure detection transmitter 1 on several several cranked tire valves that are installed in car respectively, several are installed in respectively near tire pressure receiver 5 and a control module 6 that is located on the automotive meter plate on these tire pressure detection transmitter 1 car bodies.
As Fig. 2, shown in Figure 3, this tire pressure detection transmitter 1 is provided with a housing 10, is provided with a power supply unit 20, a pressure-sensing unit 30 in this housing 10, reaches a radiating circuit 40.
Be provided with in the bottom of this housing 10 one with tire in or the passage 11 of valve (figure do not show) phase configuration, this passage 11 is connected by a hollow push rod 12, behind the inside or this radio tire pressure detecting transmitter 1 of the corresponding respectively locking of its valve of four tires of vehicle, tire pressure in the tire just can enter in the housing 10 via this passage 11, form one first accommodation chamber 13 in this housing 10 and between this passage 11, cover cap 14 of corresponding screw lock above this housing 10, be embedded with a dividing plate 15 at this cover cap 14 near the bottom, make 15 on this cover cap 14 and this dividing plate form one second accommodation chamber 16, in this first accommodation chamber 13, be provided with a printed circuit board (PCB) 17, and this power supply unit 20 is set on this printed circuit board (PCB) 17, the circuit of this radiating circuit 40 and this pressure-sensing unit 30.
Cooperate shown in Figure 3, it is the circuit block diagram of the tire pressure detection transmitter 1 of the first embodiment of the present invention, this power supply unit 20 is the power supplys that can supply circuit running on this printed circuit board (PCB) 17 in order to produce, comprises a vibration generating device 21, a rectification circuit 22, a booster circuit 23, a standby power supply device 24 and a power-saving control circuit 25.
As shown in Figure 2, this vibration generating device 21 is arranged in this second accommodation chamber 16, comprise a piezoelectric element 210, a shell fragment 211 and a pouring weight 212, this piezoelectric element 210 is located on this shell fragment 211, and can draw power supply and be connected to this printed circuit board (PCB) 17, these shell fragment 211 1 ends are embedded the position, stage casing at these second accommodation chamber, 16 madial walls, the other end is embedded this pouring weight 212, this pouring weight 212 is the vibrations that produce than large amplitude in order to this shell fragment 211 of interlock, when the wheel of vehicle is rolling, this shell fragment 211 of this vibration generating device 21 can constantly be gone up, following vibration makes this piezoelectric element 210 produce piezoelectric effect and then export an alternating current.
Cooperate shown in Figure 4ly, this rectification circuit 22 is to constitute a full-wave rectification effect by four diodes 220 (D1-D4), is direct current with the AC rectification that this piezoelectric element 210 is exported.This booster circuit 23 comprises an electric power storage unit 230 (being an electric capacity in the present embodiment); the direct current of being exported from this rectification circuit 22 is temporary in this electron storage element 230; and then through a current limiting element 231 (being a current-limiting resistance in the present embodiment); with the magnitude of current of restriction to these standby power supply device 24 chargings; and utilize a protecting component 232 (being a diode in the present embodiment) so that a voltage limit to be provided, avoid 24 chargings of this reserve battery device excessive and damage the circuit of this pressure-sensing unit 30.
As shown in Figure 3 and Figure 4, this standby power supply device 24 is the output terminals that are connected this booster circuit 23, to reach effect by 24 chargings of 21 pairs of these standby power supply devices of this vibration generating device, and this standby power supply device 24 can provide be connected power supply when car is waited for bus or the power supply of short time during stagnation of movement use, in the present embodiment, this standby power supply device 24 is to adopt a rechargeable battery.This power-saving control circuit 25 is to be used for when tire stops operating, after this vibration generating device 21 stops vibrating power-generation, 0 volt of these rectification circuit 22 output, will this pressure-sensing unit 30 of sever supply and this standby power supply devices 24 of radiating circuit 40 power supplys in a schedule time, to reach purpose of power saving.
To shown in Figure 6, this pressure-sensing unit 30 comprises a capacitive means 300 as Fig. 2, and this capacitive means 300 has one pneumatic 31, electric-conductors 33 and a change-over circuit 34.This electric-conductor 33 is a scale copper in the present embodiment, and this pneumatic 31 is bent into by scale copper, be located between this passage 11 and first accommodation chamber 13, this pneumatic 31 includes an air chamber 311, and be formed with a plurality of wrinkle Zhe 312 in the side, and top and bottom are tool one end face 313 and an opening 314 respectively, and this opening 314 is in order to allow the pressure of tire that enters pass this end face 313 positions, impel this end face 313 and the distance of this electric-conductor 33 to change, use the capacitance that changes this capacitive means 300.This pneumatic 31 is to be placed in the insulation shell 315 and apart distances with electric-conductor 33, and insulation shell 315 respectively has an insulating lid 316 to cover up and down, and is separated with an insulating trip 317 between pneumatic 31 and electric-conductor 33, with the short circuit of avoiding expecting.
This change-over circuit 34 includes a first microprocessor 340 and an oscillation circuit 341, and above-mentioned capacitive means 300 is to be connected on this oscillation circuit 341, when the distance of passing this end face 313 and this electric-conductor 33 when pressure of tire changes, just can change the RC oscillation frequency that this oscillation circuit 341 is produced.This first microprocessor 340 is oscillator signals that this oscillation circuit 341 of detecting is produced in a set time, by this, the signal of being sensed is seen through this first microprocessor 340 convert a numerical value to, and compile by this first microprocessor 340 and to produce one with ISN and represent first signal of tire pressure numerical value, and export the secondary signal that this radiating circuit 40 is launched a radio signal again to.
Cooperate Fig. 1, Fig. 7 and shown in Figure 8, these tire pressure receivers 5 are to be installed in car body near the tire place, and be provided with a receiving circuit 50, can receive the secondary signal that corresponding tire pressure detection transmitter 1 is launched, this receiving circuit 50 comprises a receiving antenna 51, a high-frequency amplifier circuit 52, a detecting circuit 53, a low-frequency filter circuit 54, a low-frequency amplifier circuit 55 and a comparator circuit 56.This receiving antenna 51 is to be used for receiving the secondary signal that a corresponding tire pressure detection transmitter 1 launched and to input to this high-frequency amplifier circuit 52, this high-frequency amplifier circuit 52 is via a first order amplifying circuit 520 outputs, connect a wave filter 521 and second, three-stage amplifier 522,523, to increase the high-frequency gain in the signal and to reduce the gain of its low frequency, this signal is again by this detecting circuit 53, this low-frequency filter circuit 54 and this low-frequency amplifier circuit 55, obtaining noise than good simulating signal, and by 56 pairs of these simulating signals of this comparator circuit via wave shaping to convert the 3rd signal of a numeral to.
As shown in Figure 9, this control module 6 is provided with a mu balanced circuit 60, a control circuit 61 and an indicating circuit 62.This mu balanced circuit 60 is that power supply that car provides is given providing this control circuit 61 and this indicating circuit 62 after the voltage stabilizing, and be provided with a power light 600, with the display power supply opening, this control circuit 61 is by one second microprocessor 610, to read the 3rd signal of the numeral that these tire pressure receivers 5 are exported, read the 3rd signal and obtain a tire pressure value via this second microprocessor 610.This indicating circuit 62 provides a digital indicator 621 in the instrument panel of car and be provided with an alarm 620.This tire pressure value is after the relatively more default normal tire pressure value scope of this second microprocessor 610, if tire pressure is too high or too lowly will open this alarm 620, and this second microprocessor 610 can convert this tire pressure value to an indicator signal, control this digital indicator 621 and show a tire pressure numerical value, in the present invention, this digital indicator is a LCD digital indicator, or a light-emitting diode display (figure does not show), to show that the tire pressure value that obtains is the tire pressure value of that tire.
Figure 10 is a second embodiment of the invention, its structure is identical with first embodiment haply, but the electric-conductor 33 of its pressure-sensing unit 30 makes a metal spiral spare into, directly is screwed in the inner bolt hole 3151 of insulation shell 315 tops, and it can adjust the predetermined capacitance of capacitive means 300.
Figure 11 is a third embodiment of the invention, its structure is identical with first embodiment haply, but the electric-conductor 33 of its pressure-sensing unit 30 is convexly equipped with a circle flange 3152 in the inner bottom surface of this scale copper, and be connected with a core bar 318 in pneumatic 31 end face 313, this core bar 318 gos deep into the inner space of this circle flange 3152, the variation that it can more certain this capacitance of induction.
Figure 12 is a fourth embodiment of the invention, its structure is identical with first embodiment haply, but use a circular thin copper splinter instead for pneumatic 31 of its pressure-sensing unit 30, the surface has a plurality of wrinkle Zhe 312, form an end face 313 and a bottom surface 310 thereon respectively, this bottom surface 310 impels this end face 313 and the distance of this electric-conductor 33 to change in order to allow the pressure of tire that enters pass, and uses the capacitance that changes this capacitive means 300.
Figure 13 is a fifth embodiment of the invention, its structure is identical with the 4th embodiment haply, but it is convexly equipped with a circle flange 3152 at the inner bottom surface of electric-conductor 33 scale coppers again, and be connected with a core bar 318 at pneumatic 31 end face 313, this core bar 318 gos deep into the inner space of this circle flange 3152, also can more positively respond to the variation of this capacitance.
Cooperate Figure 14, shown in Figure 15, it is fixing that the fixed form of this tire pressure detection transmitter 1 can have the elastomeric belt body 90 of angling fastener 91 with two ends, and on the bottom outer rim of the housing 10 of this tire pressure detection transmitter 1 and the cover cap 14 moulding several can be subjected to the pilot hole 92 that angles part 91 snappings of this elastomeric belt body 90, make on the steel ring of these elastomeric belt body 90 latch closures in axle is located at the tire of vehicle both sides, so that this tire pressure detection transmitter 1 fixedly on the steel ring in the tire, is made this tire pressure detection transmitter 1 sensing tire pressure at any time.
Figure 16,17 show, this tire pressure detection transmitter 1 fixed form also can be a L type location pedestal 93 on the steel ring that can be fixed in the tire, the one side of this location pedestal 93 can be fixed in the steel ring inboard with valve 96, another side is provided with one first embedding portion 94 (present embodiment is an internal thread), and this tire pressure detection transmitter 1 outside the air hole of these housing 10 bottoms one of moulding with this first be embedded that portion 94 cooperatively interacts second be embedded portion 95 (present embodiment is an external thread), make this tire pressure detection transmitter 1 second be embedded that portion's 95 spiral shells are solid to be embedded portion 94 at first of this location pedestal 93, make this tire pressure detection transmitter 1 sensing tire pressure at any time with this.
Claims (10)
1, a kind of radio tire-pressure detector, comprise a plurality ofly can be installed in tire pressure detection transmitter on the tire respectively, at least one is corresponding with this tire pressure detection transmitter and can be installed in a tire pressure receiver on the car body and a control module; This tire pressure detection transmitter comprises a housing, is provided with a power supply unit, a pressure-sensing unit and a radiating circuit in this housing, it is characterized in that:
This power supply unit comprises a vibration generating device and a rectification circuit; This vibration generating device comprises a piezoelectric element, a shell fragment and a pouring weight, this piezoelectric element is located on this shell fragment, and draw power supply by this piezoelectric element, at this shell fragment one end this pouring weight is set, when tyre rotation, make this shell fragment vibration, and act on this piezoelectric element and produce a power supply by the vibration force of this shell fragment, this power supply provides a power supply to this pressure-sensing unit and this radiating circuit after this rectification circuit rectification;
This pressure-sensing unit comprises a capacitive means, and this capacitive means comprises one pneumatic, one electric-conductor and a change-over circuit; This pneumatic is that conductive material is made, and becomes predetermined space apart from setting with this electric-conductor; When the pressure of tire that is entered is passed, this pneumatic distance with this electric-conductor changed, it can change the capacitance of this capacitive means; This change-over circuit comprises an oscillation circuit, and this capacitive means is connected on this oscillation circuit, so that change-over circuit can be detected the RC waveform number of times that this oscillation circuit produces, and first signal output that produces an expression tire pressure numerical value;
This radiating circuit receives first signal from this pressure-sensing unit, and sends a wireless secondary signal;
These tire pressure receivers receive the secondary signal that corresponding this tire pressure detection transmitter is launched, and export one the 3rd signal;
This control module comprises a control circuit and an indicating circuit, and this control circuit is to receive the 3rd signal, and via producing an indicator signal after the microprocessor processes.
2, according to the said radio tire-pressure detector of claim 1, it is characterized in that said pneumatic comprises an air chamber, the side of air chamber forms a plurality of wrinkle Zhe, and top and bottom have an end face and an opening respectively.
3, according to the said radio tire-pressure detector of claim 1, it is characterized in that said pneumatic is a shell fragment, the surface has a plurality of wrinkle Zhe, forms an end face and a bottom surface respectively below thereon.
4, according to the said radio tire-pressure detector of claim 1, it is characterized in that said tire pressure receiver and tire pressure detection transmitter, its quantity is corresponding, each tire pressure receiver is installed in the car body place near each tire respectively, the secondary signal of being launched with tire pressure detection transmitter corresponding on the short distance reception adjacent tires.
5,, it is characterized in that said power supply unit also is provided with a standby power supply device according to the said radio tire-pressure detector of claim 1.
6,, it is characterized in that said standby power supply device is a rechargeable device according to the said radio tire-pressure detector of claim 5.
7, according to the said radio tire-pressure detector of claim 6, it is characterized in that said power supply unit, it also is provided with a booster circuit.
8, according to the said radio tire-pressure detector of claim 5, it is characterized in that said power supply unit, it also is provided with a power-saving control circuit.
9,, it is characterized in that said pneumatic is that flexible materials is made according to the said radio tire-pressure detector of claim 1.
10, according to the said radio tire-pressure detector of claim 1, it is characterized in that said tire pressure receiver, it respectively comprises a receiving antenna, a high-frequency amplifier circuit, a detecting circuit, a low-frequency amplifier circuit and a comparer, after this secondary signal receives via this receiving antenna, through this high-frequency amplifier circuit, this detecting circuit, this low-frequency amplifier circuit handle a signal, and after doing wave shaping by this comparer, the 3rd signal of tire pressure value is represented in output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98125224 CN1092330C (en) | 1998-12-16 | 1998-12-16 | Radio tyre-pressure detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98125224 CN1092330C (en) | 1998-12-16 | 1998-12-16 | Radio tyre-pressure detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1257194A CN1257194A (en) | 2000-06-21 |
| CN1092330C true CN1092330C (en) | 2002-10-09 |
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ID=5229093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98125224 Expired - Fee Related CN1092330C (en) | 1998-12-16 | 1998-12-16 | Radio tyre-pressure detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1092330C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7138911B2 (en) * | 2004-08-04 | 2006-11-21 | Michelin Recherche Et Technique S.A. | Power conversion from piezoelectric source with multi-stage storage |
| CN100344469C (en) * | 2005-12-07 | 2007-10-24 | 何崇中 | Passive tyre pressure monitoring system |
| US9290067B2 (en) * | 2012-08-30 | 2016-03-22 | Freescale Semiconductor, Inc. | Pressure sensor with differential capacitive output |
-
1998
- 1998-12-16 CN CN 98125224 patent/CN1092330C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1257194A (en) | 2000-06-21 |
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