JP2000153703A - Tire-pressure alarm, and control jig capable of arbitrarily manipurating transmission signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable transmission and discontinuation of radio transmission to be conducted at any time, by providing a detecting circuit receiving an output as its input and a shaping circuit receiving an output as its input, and inputting a trigger signal output from the shaping circuit to a control section. SOLUTION: A transmitter 1 includes a pressure sensor 7 for detecting a tire pressure. Information from the pressure sensor 7 is transmitted by a radio transmitting section 2. The transmitter 1 further includes a transmitting antenna 8. A control section 6 controls these elements. The transmitter 1 further includes a tuning circuit 3 connected to the transmitting antenna 8. A detecting circuit 4 receiving an output as its input and a shaping circuit 5 receiving an output as its input are provided, so that a trigger signal 17 output from the shaping circuit 5 is input to the control section 6. Thus, at any time, the control section 6 can conduct radio transmission of ID data, sensor data and the like, and can enter into an operating state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire pressure warning device for detecting an abnormality of a vehicle tire pressure and warning a driver in the vehicle, and transmits the signal even after a transmitter is mounted in the tire. Pairing with a receiver can be performed easily and quickly, and transmission of radio wave output,
The present invention relates to a tire pressure alarm device that can be stopped.

[0002]

2. Description of the Related Art Japanese Patent No. 2639856 discloses a tire pressure alarm device which detects a decrease in air pressure of a vehicle tire and notifies the driver of the decrease. As shown in FIG. 6, the conventional tire pressure warning device includes a transmission unit 19 disposed inside a wheel rim unit 18.
And a valve stem 20 for injecting air into the tire. The transmission is performed when the data is measured and transmitted wirelessly at regular intervals, or when there is a sudden change in the pressure at each measurement beyond a certain value. In this system, the transmitter is installed in a sealed airtight space inside the tire, once installed,
He couldn't touch his hand, arbitrarily changed his operating state, and couldn't turn off or turn on radio waves whenever he wanted.

[0003] Tires need to be replaced, and due to the rotation performed to make the tire wear uniform, pairing for matching the car with the tire and sometimes pairing for matching the tire position are required. Come. For this reason, an ID code is assigned to each transmitter, and this data is sent simultaneously for each transmission to specify the position of the vehicle and the tire.

[0004]

However, in the conventional system, the sensor is located in the tire, transmits radio waves at predetermined intervals, and ID information is registered in a receiver mounted on the vehicle. In the pairing work to be able to use as a pair, it had to wait for the transmitter to transmit radio waves, and it took a long time. Shortening the transmission interval shortens the battery life, which is also difficult in a tire where battery replacement is not easy.

[0005] Also, since the information transmission means is radio waves,
Regulations vary from country to country, and in some cases, even if they comply with the regulations of the country of use, they may not comply with the regulations of the country of origin. In this case, it is essential to forcibly stop transmitting radio waves.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a transmitter which cannot be touched in a tire transmitted at an arbitrary time, or a radio wave transmission is stopped. Pairing with the transmitter in the tire can be performed easily and the positional relationship between the vehicle, the tire, and the tire position can be limited.

[0007]

According to the first aspect of the present invention, a wheel rim section includes a pressure sensor for detecting tire pressure, a radio wave transmitting section for transmitting information from the pressure sensor, A transmitter 1 comprising a transmitting antenna 8 having a valve stem function of the radio wave transmitting unit 2 and a control unit 6 for controlling the transmitting antenna 8 is provided, while a receiving antenna 10 and a receiving A receiver 11 in the vehicle interior connected to the antenna 10, and a display 12 and an alarm 13 based on the reception information obtained by the receiver 11 are provided.
In a pneumatic pressure alarm device for alarming a decrease in air pressure, the transmitter 1 includes a tuning circuit 3 connected to the transmission antenna 8, a detection circuit 4 having the output as an input, and a shaping circuit 5 having the output as an input. And a trigger signal 17 output from the shaping circuit 5 is input to the control unit 6.

In the tire pressure alarm device according to the first aspect, in addition to the transmission antenna 8 and the control unit 6 in the transmitter, the transmission antenna 8 is used as an input antenna, and the tuning circuit 3, the detection circuit 4, and the shaping circuit are used. By providing a circuit 5 and using a signal output from the shaping circuit 5 as a trigger signal 17, bidirectional communication can be performed as compared with the conventional product.

According to a second aspect of the present invention, when the trigger signal 17 in the transmitter 1 is input to the control unit 6, information is transmitted or stopped according to the signal timing of the trigger signal 17. The tire pressure warning device according to claim 1, wherein

In the tire pressure warning device according to the second aspect, information is transmitted or stopped according to the signal timing of the trigger signal 17, so that it can be distinguished from a signal due to simple noise. The reliability of the system can be improved.

The invention according to claim 3 is a wheel rim portion 1
Reference numeral 8 denotes a pressure sensor 7 for detecting tire pressure, a radio wave transmitting unit 2 for transmitting information of the pressure sensor 7, a transmission transmitting antenna 8 having a valve stem function of the radio wave transmitting unit 2, and a control unit for controlling them. A transmitter 1 is provided, which is constituted by a control unit 6 that performs the control.
0, a receiver 11 in the vehicle cabin connected to the receiving antenna 10, and a display 12 and an alarm 13 based on the reception information obtained by the receiver 11, and an air pressure for alarming a decrease in air pressure. In the alarm device, a control jig 14 for pairing the receiver 11 paired with the transmitter 1
Is composed of a write transmission antenna 15 used in contact with the transmission antenna 8 of the transmitter 1 and a stop / operation switch 16, and the write transmission antenna 15 of the control jig 14 is brought into contact with the transmission antenna 8, By operating the stop / operation switch 16 of the control jig 14, radio waves are transmitted and stopped so that the transmission state of the transmitter 1 can be controlled. It is a control jig that can be operated.

In the control jig according to the third aspect of the present invention, the transmission signal for the tire pressure warning device can be arbitrarily operated. The length is the sum of the length of the valve stem, which is the length, and the length of the write transmission antenna 15. If this length is made to match the wavelength λ of the signal radio wave, the transmission antenna 8 can be used even from the short transmission antenna 8 of the transmitter 1. It is possible to capture and input radio waves efficiently. Generally antenna length lambda when the wavelength of the radio wave is λ _0, λ _0/4 of the length of the antenna used, are known to act efficiently as this time antenna.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a tire pressure alarm device on the tire side according to the present invention, in which a transmitter 1 is fixed to a wheel rim portion 18.

FIG. 2 is a block diagram of a tire pressure alarm device according to the present invention. The transmitter 1 includes a pressure sensor 7 for detecting tire pressure, and a radio wave transmitter 2 for transmitting information of the pressure sensor 7. A transmitting antenna 8 of the radio wave transmitting unit 2, a control unit 6 for controlling them, a tuning circuit 3 connected to the transmitting antenna 8, a detection circuit 4 receiving the output, and an input receiving the output. And a trigger signal 17 output from the shaping circuit 5 is input to the control unit 6. In the figure, reference numeral 9 denotes a battery.

FIG. 3 shows a block diagram of the receiver 11, in which a receiving antenna 10 and the receiving antenna 1 are provided on the vehicle body side.
0, a receiver 11 connected to the vehicle interior,
The display 12 and the alarm 13 are configured to warn of a decrease in air pressure based on the reception information obtained in the step (1).

FIG. 4 is a schematic view of the control jig 14, which is used to perform pairing of the receivers 11 forming a pair. The control jig 14 includes a write transmission antenna 15 used in contact with the transmission antenna 8 of the transmitter 1 and a stop / operation switch 16.

That is, in the control jig 14 according to the present invention,
By operating the stop / operation switch 16 from the rod-shaped writing transmission antenna 15, a radio wave is transmitted, and the radio wave output is generated by contacting or approaching the transmission antenna of the transmitter 1 mounted on the tire. The data is efficiently sent to the transmitter 1.

FIG. 5 is a timing chart of the trigger signal 17 of the transmitter 1. When a low level signal for one second is input three times within five seconds, the transmitter 1 transmits a radio wave including ID information. Make a call and start the action. When the trigger signal 17 is again input by the control jig 14 again, the control jig 14 similarly emits a radio wave and stops the operation.

[0019]

The operation of the tire pressure alarm device will be described with reference to FIG. 2. As for the transmitter 1 on the tire side, the detection value of the pressure sensor 7 is signal-processed by the control unit 6 using a microcomputer or the like, and the ID information is transmitted. Alternatively, the pressure data is transmitted from the transmitting antenna 8 as a radio signal by the radio wave transmitting unit 2.

The transmission jig 14 shown in FIG.
When the operation switch 16 is pressed, the timing signal in FIG. 5 is AM-modulated and radiated from the write transmitting antenna 15. The larger the antenna, the higher the efficiency is. However, the transmitter 1 cannot use a large antenna due to the mounting location.
It is necessary to increase the output of the control jig 14 described above, but increasing the output is also restricted due to regulatory problems.

However, in the present invention, by using the writing transmitting antenna 15 of the control jig 14 and the transmitting antenna 8 of the transmitter 1 in contact with and in close proximity to each other, the overall antenna length is set to a working length. And a small transmission output can be effectively operated.

A target signal is selected from a signal such as noise by a tuning circuit 3 of a radio signal from a transmitting antenna 8 of the transmitter 1, demodulated by a detection circuit 4, and shaped by a shaping circuit 5.
As a result, a signal which is the same as the signal timing of FIG. 5 is generated and becomes a trigger signal 17 and is input to the control unit 6. As a result, the control unit can wirelessly transmit ID data, sensor data, and the like at any time, and can enter an operation state.

The receiving unit 11 may be set in an ID registration state prior to the transmission by the transmitter 1, and this can be easily realized by attaching a switch or the like (not shown). Further, by attaching the control jig 14 to the transmitter 1 again and operating in the same manner, if the transmitter 1 is programmed in advance so that the transmission is stopped this time, the transmission and stop of the radio wave can be arbitrarily controlled. be able to. If the same applies to the transmitters attached to the other wheels, the IDs of the four wheels can be registered in the receiver. If the positions of the tires to be transmitted at this time are determined as, for example, right front, right rear, left rear, and left front, it is easy to specify the tire position based on the ID information.

The tuning circuit 3 and the detection circuit 4 of the transmitter 1 are sufficiently practical if the received power is large as seen in the configuration of the ore radio with no power supply, and can be operated only by the input received power. it can. This can be achieved by appropriately setting the length of the write transmission antenna 15 of the control jig 14. The shaping circuit 5 can obtain the signal timing of FIG. 5 by being formed of a transistor (not shown), and the current consumption can be reduced to only 50 μA only when the signal is at a low level.

According to an experiment, the output of the control jig 14 may be about the same as a so-called extra-low power wireless device in Japan. Nor.

[0026]

As described above, according to the tire pressure alarm device of the present invention, a transmitter and a receiver mounted on a tire, and a pairing required for determining the position (tire position) of the tire can be arbitrarily determined from the transmitter. Occasionally, it can be realized by transmitting a radio wave having ID information. It is also possible to stop the transmission of radio waves at any time and flexibly respond to the regulations of radio laws at the place of production and the place of use. Another important factor in operation is that the control jigs in Japan have regulations for special-purpose wireless devices, which are very easy to use in terms of regulations and technology.

[Brief description of the drawings]

FIG. 1 is a tire side configuration diagram of a tire pressure alarm device according to the present invention.

FIG. 2 is a block diagram of a tire pressure warning device according to the present invention.

FIG. 3 is a block diagram of a receiver according to the present invention.

FIG. 4 is a control jig according to the present invention.

FIG. 5 shows the timing of a trigger signal.

FIG. 6 is a sectional view of a conventional transmitter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Transmitter 2 Radio wave transmitter 3 Tuning circuit 4 Detection circuit 5 Shaping circuit 6 Control circuit 7 Pressure sensor 8 Transmitting antenna 9 Battery 10 Receiving antenna 11 Receiver 12 Display 13 Alarm 14 Control jig 15 Writing transmitting antenna 16 Stop / operation Switch 17 Trigger signal 18 Wheel rim 19 Transmitter 20 Valve stem

Claims (3)

[Claims] 1. A wheel rim section includes a pressure sensor for detecting tire pressure, a radio wave transmitting section for transmitting information from the pressure sensor, and a transmission section having a valve stem function for the radio wave transmitting section. A transmitter 1 including an antenna 8 and a control unit 6 for controlling the antenna 8 is provided. On the vehicle body side, a receiving antenna 10 and a receiver 11 in a vehicle compartment connected to the receiving antenna 10 are provided. An indicator 12 and an alarm 13 are provided based on the reception information obtained by the receiver 11, and an air pressure alarm device for alarming a decrease in air pressure is provided. The transmitter 1 is connected to the transmission antenna 8. A tuning circuit 3, a detection circuit 4 having the output as an input, and a shaping circuit 5 having the output as an input are provided, and a trigger signal 17 output from the shaping circuit 5 is input to the control section 6. Transmitter 1. A tire pressure alarm device comprising: 2. The apparatus according to claim 1, wherein when the trigger signal 17 in the transmitter 1 is input to the control unit 6, information is transmitted or stopped according to the signal timing of the trigger signal 17. Tire pressure alarm device. 3. The wheel rim section 18 has a pressure sensor 7 for detecting tire pressure, a radio wave transmitting section 2 for transmitting information from the pressure sensor 7, and a transmission section having a valve stem function of the radio wave transmitting section 2. A transmitter 1 including a transmitting antenna 8 and a control unit 6 for controlling the transmitting antenna 8 is provided. On the vehicle body side, a receiving antenna 10 and a receiver 11 in the vehicle interior connected to the receiving antenna 10 are provided. And the receiver 1
The display 12 and the alarm 13 based on the reception information obtained in step 1
The control jig 14 for performing pairing of the receiver 11 paired with the transmitter 1 includes a transmission antenna 8 of the transmitter 1.
The control jig 1 is composed of a write transmission antenna 15 used in contact with the control jig and a stop / operation switch 16.
No. 4, the transmission antenna 15 is brought into contact with the transmission antenna 8, and the operation of the stop / operation switch 16 of the control jig 14 allows the transmission / stop of radio waves to control the transmission state of the transmitter 1. A control jig capable of arbitrarily operating a transmission signal for a tire pressure alarm device.