CN1208175A - Tire pressure detection warning device - Google Patents

Abstract

A tyre pressure detecting and warning device is characterized in that a channel which can be configured with a tyre nozzle is arranged on an outer shell, a pressure sensor which can detect the tyre pressure, a transmitting circuit and a receiving circuit which is arranged separately from the transmitting circuit are arranged in the outer shell, the transmitting circuit is provided with a power supply circuit which supplies the whole transmitting circuit to operate, the power supply circuit comprises a self-generating device, a rectifying circuit, a rechargeable battery pack and a charging circuit, and the self-generating device comprises a piezoelectric element which is electrically connected with the rectifying and charging circuit and an impact unit which can impact the piezoelectric element to generate the piezoelectric effect and output alternating current.

Description

Tire pressure detection warning device

The invention relates to a tire pressure detection and warning device, in particular to a tire pressure detection and warning device which can generate electric power by itself when the vehicle is running and the tires are rotating, so as to supply the power required for the operation of the transmitting circuit.

The general tire pressure warning device is installed on the tire of the car to sense whether the tire pressure value of the tire is within the normal range. It includes a transmitting circuit and a receiving circuit. The transmitting circuit is arranged in the tire pressure warning device. The receiving circuit can be configured on the dashboard of the car for easy observation. When the transmitting circuit senses that the tire pressure value is not within the normal range, that is, the tire pressure value is too high or too low, the transmitting circuit will send a radio signal Send, and receive and identify the source of the radio signal by this receiving circuit, show or can send out an alarm simultaneously, just can know which tire or the tire pressure of which several tires are too high or too low. The receiving circuit of the previous tire pressure alarm is configured in the vehicle, so the power supply required for the operation of the receiving circuit is generally the power supply of the car, and the transmitting circuit is installed in the tire pressure alarm because it is installed inside the tire pressure alarm. Therefore, the power supply required for the operation of the transmitting circuit is generally a battery pack (composed of mercury batteries or lithium batteries connected in series) installed in the tire pressure warning device. However, when the battery pack of the conventional tire pressure warning device is exhausted, new batteries must be replaced to make the transmitting circuit of the tire pressure warning device operate normally, which is very inconvenient.

The object of the present invention is to provide a tire pressure detection and warning device that can generate electricity by itself while the vehicle is moving and the tires are rotating, so as to supply the power required for the operation of the transmitting circuit of the tire pressure detection and warning device, without using other of electricity.

To achieve the above object, the present invention takes the following scheme:

The tire pressure detection and warning device of the present invention is characterized in that by setting a self-generating device, when the vehicle is moving and the tires are rotating, the impact unit of the self-generating device will continuously hit the piezoelectric element to generate Piezoelectric effect, and output AC power, and then rectified into DC by a rectification and charging circuit, the power can be output to the rechargeable battery pack, and supply the power required for the operation of the transmitting circuit of the tire pressure detection and warning device, thereby completely eliminating No need to consume any other power, not only can reduce expenditure, but also do not need to replace the battery pack.

The tire pressure detection and warning device of the present invention is to install the tire pressure detection and warning device inside the tire or on the air nozzle through the channel provided on the outer casing to be configured with the tire air nozzle. The pressure enters the outer casing through the channel, and at least one pressure sensor, a transmitting circuit and a receiving circuit separately arranged from the transmitting circuit are arranged in the outer casing, and the transmitting circuit can supply the power required for the operation of the entire transmitting circuit. The power supply circuit includes a rechargeable battery pack, a rectification and charging circuit, and a self-generating device. The self-generating device includes a piezoelectric element electrically connected to the rectification and charging circuit and an impact unit. When the vehicle is moving and the tires are rotating, the impact unit continuously impacts the piezoelectric element to generate piezoelectric effect and output alternating current, which is then rectified into direct current by the rectifying and charging circuit to charge the battery pack.

In the tire pressure detection and warning device for automobiles of the present invention, a channel that can be configured with tires or tire valves is provided on an outer shell, and a pressure sensor that can measure the tire pressure, a pressure sensor that can measure the tire pressure, and a pressure sensor that can measure the tire pressure are arranged in the outer shell. The tire pressure is sent by a radio signal to the transmitter circuit and a receiver circuit that is separated from the transmitter circuit and identifies the source and value of the radio signal, and displays or sends out an alarm at the same time. The transmitter circuit has a power supply for the operation of the entire transmitter circuit The power supply circuit is characterized in that:

The power supply circuit includes a self-generating device, a rectifying circuit for rectifying alternating current into direct current, a rechargeable battery pack and a charging circuit for charging a pair of battery packs; the self-generating device includes a piezoelectric element electrically connected to the rectifying and charging circuit And an impact unit that can impact the piezoelectric element to generate piezoelectric effect and output alternating current.

Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

Description of drawings:

Fig. 1 is a combined sectional view of the first preferred embodiment of the present invention.

Fig. 2 is a block diagram of the transmitting circuit of the above-mentioned preferred embodiment of the present invention.

Fig. 3 is a block diagram of the receiving circuit of the above preferred embodiment of the present invention.

Fig. 4 is a circuit diagram of the power supply circuit of the above preferred embodiment of the present invention.

Fig. 5 is a combined sectional view of the second preferred embodiment of the present invention.

Fig. 6 is a combined sectional view of the third preferred embodiment of the present invention.

Fig. 7 is a schematic front view of the fixing belt.

FIG. 8 is a schematic diagram of fixing the tire pressure detection and warning device of the third preferred embodiment of the present invention on the steel ring inside the tire by the fixing belt in FIG. 7 .

Fig. 9 is a schematic view of the cooperation between the tire pressure detection and warning device and the positioning seat according to the third preferred embodiment of the present invention.

Fig. 10 is a schematic view of the positioning seat body to fix the tire pressure detection and warning device on the steel ring in the tire in the third preferred embodiment of the present invention.

As shown in Figure 1, the tire pressure detection and warning device of the present invention is provided with a channel 100 which is mutually configured with the inside of the tire or the air nozzle (not shown) on its outer shell 10, and the channel 100 is connected with a hollow ejector rod 200 , when the interior of several tires of the vehicle or their air nozzles are respectively locked corresponding to the tire pressure warning detection and warning device 1, the tire pressure in the tire can enter the outer shell 10 through the channel 100, and a channel is formed in the outer shell 10. 100 communicated with the first accommodating chamber 11, and a cover 15 correspondingly screwed on the top of the outer shell 10, the cover 15 is embedded with a partition 14 near the bottom, and a partition 14 is formed between the cover 15 and the partition 14. The second accommodating chamber 12, the first accommodating chamber 11 is provided with a printed circuit board 13, and on the printed circuit board 13 is provided with a pressure sensor 20 which can sense the tire pressure, and other electronic components. Composed of the transmitter circuit 2. As shown in Figure 2, the transmitting circuit 2 includes a power supply circuit 3 that can supply the power required for the operation of the entire circuit, a pressure sensor 20 that senses the tire pressure, and outputs a voltage value corresponding to the tire pressure (for analog signal) pressure sensing unit 21, a signal converter 22 that can convert the analog signal input from the pressure sensing unit 21 into a digital signal output, and a digital signal that can be encoded by the signal converter 22 and connected with it The coding unit 23 that compares the reference value set in the interior, if the result of the comparison is that the tire pressure value is too high or too low, it can be converted into a radio signal by a radio conversion unit 24 and sent (because the transmitting circuit is the same as the prior art , so not described in detail), but received by a receiving circuit 4 (as shown in Figure 3) installed on the vehicle dashboard. As shown in Figure 3, the receiving circuit 4 includes a second power supply device 44 that can supply the power required for the operation of the entire circuit, a radio signal receiving unit 40 that can receive the radio signal output from the transmitting circuit 2, and a radio signal receiving unit 40 that can transmit the radio signal A decoding unit 41 that decodes and outputs a control signal, and a display unit 42 that corresponds to the tires of the vehicle and can display the tire pressure status of each tire after receiving the control signal number output by the decoding unit 41, or through an alarm system 43 Send an alarm at the same time to know which tire or the tire pressure of those tires is too high or too low (because the receiving circuit is the same as the prior art, so it is not described in detail).

As shown in Figures 2 and 4, the transmitting circuit 2 mainly supplies the power required for its operation through a power circuit 3, the power circuit 3 includes a rechargeable battery pack 30, and the power circuit 3 further includes a self-generating device 31, and A rectification and charging circuit 32 .

The self-generating device 31 is located in the second accommodating chamber 12, and includes a piezoelectric element 311 and an impact unit 312. In this embodiment, the piezoelectric element 311 is made of piezoelectric ceramic (piezoelectric ceramic). As shown, the piezoelectric element 311 is adjacent to the partition 14 at the bottom of the second accommodating chamber 12, and a perforation 140 is provided on the partition 14. The piezoelectric element 311 connects two wires 310 to the printing plate of the first accommodating chamber 11. The rectification on the circuit board 13 and the input end of the charging circuit 32 make the two electrically connected, and an impact unit 312 composed of 10 to 20 small steel balls is installed in the second accommodating chamber 12 and on the piezoelectric element 311, Therefore, when the vehicle is moving and the wheels are rolling, the impact unit 312 will continuously impact the piezoelectric element 311 to generate piezoelectric effect and output power (alternating current) to the input terminal of the rectification and charging circuit 32 .

The rectification and charging circuit 32 includes a full-wave rectification circuit 320 and a charging circuit 321. The full-wave rectification circuit 320 is composed of four diodes D1-D4, so as to rectify the alternating current output from the piezoelectric element 311 into a direct current for charging. The circuit 321 includes a power storage element 322, a current limiting element 323 and a protection element 324. The power storage element 322 is a capacitor C1, which can temporarily store the direct current output from the full-wave rectification circuit 320 in the power storage element 322, and then Then, through the current limiting element 323 (which is a current limiting resistor R3) to limit the charging current of the battery pack 30, the protection element 324 (which is a diode D6) provides a voltage limit, which can prevent the battery pack 30 from being overcharged and damage the transmitting circuit 2 .

As can be seen from the above, when the voltage output from the nodes a and b of the rectifying and charging circuit 32 is 0 volts (V), the entire circuit enters the sleep mode, and the power consumption of the entire system drops below 6 microamperes (μA) That is to say, after the vehicle is stationary, the self-generating device 31 will not output power, and form a power-off state, which can save power.

The manner in which the self-generating device 31 of the present invention is installed on the tire pressure detection and warning device 1 is not limited to the state shown in the first preferred embodiment in FIG. 1 , and can also be as shown in the second preferred embodiment in FIG. 5 state, the piezoelectric element 311' is arranged on the protrusion 150' of the inner wall of a tubular cover 15' and the outer wall of the inner central column 151', and 10 to 20 small steel balls are embedded in the cover 15' The impact unit 312 is configured to increase the impact contact area between the piezoelectric element 311 ′ and the impact unit 312 , so that the output power of the piezoelectric element 311 ′ increases each time it is impacted.

The tire pressure detection and warning device of the first and second preferred embodiments of the present invention uses the pressure sensor 20 to sense the tire pressure, which is "electronic induction". "type structure" to sense the tire pressure, and the tire pressure detection and warning device 5 is fixed on the steel ring of the vehicle tire by a fixing device (as shown in Figures 7 and 8).

As shown in Figures 6 and 8, the tire pressure detection and warning device 5 is provided with a vent hole 500 on the casing 50, so that the tire pressure in the tire 8 enters the casing 50 through the vent hole 500, and a vent hole 500 is set in the casing 50. The pressure sensing and transmitting unit, the pressure sensing and transmitting unit is based on the U.S. Patent No. 5,289,161 announcement number invented by the applicant of this case, including an elastic pressure-bearing film 60, a pressure-bearing film 60 above Push rod 61, a compression spring 62 that can provide push rod 61 restoring force, a first circuit board 63, a second circuit board 64 and a transmitter device 65, the first circuit board 63 is provided with a first conductive Reed 630, the second circuit board 64 is provided with a second conductive reed 640 and a third conductive reed 641, on the second circuit board 64 is electrically connected with a power supply required for the operation of the transmitter device 65 Since the self-generating device 66 of the pressure sensing and transmitting unit 6 is disclosed in the above-mentioned US Patent, it will not be described in detail.

As shown in Figure 6, the structure and action principle of the self-generating device 66 are the same as those described in the first and second preferred embodiments, including a piezoelectric element 660 and an impact unit 661. When the vehicle is moving and the wheels are rolling, impact The unit 661 will constantly hit the piezoelectric element 660 to generate the piezoelectric effect, and output power (for alternating current), and then rectify the alternating current into DC power is used for the operation of the transmitter device 65 .

As shown in FIG. 7 , the fixing device is an elastic band 70 with hooks 700 at both ends, and on the bottom outer edge of the casing 50 of the tire pressure detection and warning device 5 and on the cover 51 (as shown in FIG. 6 ). Molding has the piercing positioning hole 52 that can be buckled by the elastic belt body 70, so that the elastic belt body 70 can be buckled on the steel ring 80 in the tire 8 on both sides of the vehicle axle, as shown in Figure 8, so that the The tire pressure detection and warning device 5 is fixed on the steel ring 80 in the tire 8, so that the tire pressure detection and warning device 5 can sense the tire pressure at any time.

As shown in Figures 9 and 10, when the tire pressure detection and warning device 5 is installed and implemented, the fixing device can also be a positioning seat body 71 welded on the steel ring 80 in the tire 8, and the positioning seat body 71 is provided with a The second embedding part 710 (is an internal thread), and the tire pressure detection and warning device 5 forms the first embedding part 53 (which is an external thread) that cooperates with the second embedding part 710 outside the vent hole 500 at the bottom of the housing 50 ), so that the tire pressure detection and warning device 5 can be screwed to the second engagement portion 710 of the positioning seat body 71 with the first embedding portion 53, so that the tire pressure detection and warning device 5 can sense the tire pressure at any time.

In summary, the present invention has the following effects:

The tire pressure detection and warning device of the present invention, through the setting of the automatic power generation device 31, and the cooperation of the rectification and charging circuit 32, makes it possible to generate electricity by itself when the vehicle is moving and the tires are rotating, and supplies the tire pressure detection device. The power required for the operation of the transmitting circuit of the warning device does not need to consume any other power at all, which not only can reduce power expenditure, but also does not need to replace the battery pack.

Claims (5)

1. A tire pressure detection and warning device, a channel that can be configured with a tire or a tire air nozzle is provided on an outer casing, and a pressure sensor that can measure the tire pressure, a pressure sensor that can measure the tire pressure, and a tire pressure sensor are arranged in the outer casing A transmitting circuit that sends out radio signals and a receiving circuit that is separated from the transmitting circuit and identifies the source and value of the radio signal, and displays or simultaneously issues an alarm. The transmitting circuit has a power supply circuit that supplies the power required for the operation of the entire transmitting circuit , characterized by: The power supply circuit includes a self-generating device, a rectifying circuit for rectifying alternating current into direct current, a rechargeable battery pack and a charging circuit for charging a pair of battery packs; the self-generating device includes a piezoelectric element electrically connected to the rectifying and charging circuit And an impact unit that can impact the piezoelectric element to generate piezoelectric effect and output alternating current. 2. According to the tire pressure detection and warning device according to claim 1, it is characterized in that: The piezoelectric element of the self-generating device adopts piezoelectric ceramics. 3. The tire pressure detection and warning device according to claim 1, characterized in that: The impact unit of the self-generating device includes at least two steel balls. 4. The tire pressure detection and warning device according to claim 1, characterized in that: The rectification and charging circuit further includes a power storage element that can temporarily store the AC power output from the piezoelectric element and rectify it into DC power. 5. The tire pressure detection and warning device according to claim 1, characterized in that: The rectification and charging circuit further includes a protection element that can provide voltage limitation to prevent the battery pack from being overcharged and damaging the transmitting circuit.

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