JPH0781340A - Pressure reduction alarms by tires - Google Patents

Abstract

PURPOSE:To provide an alarm that is installed so as to accurately inform a car driver during travel whether air pressure has reduced or not in each tire in a relatively simple structure, in regard to pressure reduction alarms by tires capable of transmitting which tire has reduced in air pressure accurately to the driver when the tire air pressure of an automobile is reduced. CONSTITUTION:In a tire air pressure alarm which transmits a signal, including a fact that air pressure decreases, out of four air pressure checkers 11 to 14 attached to an automobile tire air valve, receiving it by a receiver, and confirms it at a monitor, it is made up of installing a coding circuit 16 impressing a signal concerning a decrease in tire air pressure to be impressed from the air pressure checker and an identification code preset at every tire for their cording at the signal transmitting side, and a transmitting circuit 17 transmitting the output of this cording circuit, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decompression warning device for each tire, which can accurately inform the driver which tire the tire pressure of an automobile is when the tire pressure is reduced.

[0002]

2. Description of the Related Art When the tire pressure of an automobile is insufficient, there are many inconveniences such as an increase in rolling resistance of the tire, a decrease in high-speed durability, and a decrease in vehicle maneuverability. Therefore, it is necessary to constantly research the tire pressure. As a means for this, an air pressure checker was attached to the air valve of an automobile tire, and the driver visually observed from the outside to monitor whether or not the air pressure had decreased.

Alternatively, a transmitter is incorporated in the air pressure checker, a receiver and a monitor are installed and placed in the driver's seat, a signal is transmitted from the tire checker with reduced air pressure, the receiver receives the signal, and the monitor receives it. It is performed to visually check which tire has insufficient air pressure. An example is Shokai 3
No. 100502.

FIG. 3 is an explanatory view showing an example of a device for warning a decrease in tire air pressure described in the above publication as a prior art. In FIG. 3, when the housing of the sensing unit 40 is attached to the tire valve, air normally flows from the tire into the atmospheric pressure chamber 41 to have a high pressure, and the diaphragm 42 expands toward the atmosphere chamber side. Then, the electrical contact 44 is pushed against the biasing spring, and the switch 45 is released. Then, the electric current from the power supply 47 is not supplied to the radio wave transmission circuit 46, and the alarm signal is not transmitted from the radio wave transmission circuit. However, when the tire air pressure decreases and falls below the range of the appropriate value corresponding to the elasticity of the biasing spring, the diaphragm retracts, the electrical contact 44 is pushed back by the biasing spring, and the switch 45 is closed. Becomes Then, the current from the power supply 47 is supplied to the radio wave transmission circuit 46, and the alarm signal is transmitted. The radio wave receiving circuit 48 receives the alarm signal and issues an output command to the sound generating circuit 49 to generate an alarm for abnormal tire pressure reduction.

[0005]

In the prior art, when a pneumatic checker is folded around a tire air valve, the driver needs to look around each tire before the vehicle runs, and at that time, there is usually no one on board. Therefore, it was difficult to discover that the tire pressure was decreasing unless the tire pressure was obviously decreasing. If the air pressure decreased for some reason while driving, the driver could not know it.

When the decrease in tire air pressure is transmitted to the driver's seat by means of a radio wave transmission circuit or the like, a tire having a decreased air pressure is specified and a signal processing circuit is used to transmit the tire position as a signal. Since the tires are manufactured and adjusted for each tire, it is very complicated, and thus the alarm device is expensive.

The present invention solves the above-mentioned drawbacks, and provides an alarm device having a relatively simple structure, which is provided for a moving vehicle driver so as to accurately notify each tire whether or not the air pressure has decreased. Especially.

[0008]

FIG. 1 is a block diagram showing the principle configuration of the present invention. In FIG. 1, 11 to 14 are air pressure checkers for each tire, 15 is a predetermined identification code generator for identifying a tire, 16 is an encoding circuit, and 17 is a transmission circuit. In FIG. 1, the illustration of the receiver and the monitor is omitted. They can be the prior art itself.

A tire pressure reducing alarm device for transmitting a signal including a decrease in air pressure from a pneumatic pressure checker attached to a tire air valve of an automobile, receiving the signal at a receiver and confirming it on a monitor. The configuration is as follows. That is, on the signal transmission side, a coding circuit that is applied to code a signal indicating that the tire pressure has been reduced, which is applied from the pneumatic pressure checker, and a predetermined identification code for each tire, and the code. And a transmitter circuit for transmitting the output of the digitizer circuit.

According to the second aspect of the present invention, since the digital encoding circuit (encoder) is used, the identification code generating circuit can be made a simple structure without using it.

[0011]

According to the first aspect of the present invention, the pneumatic pressure checkers 11 to 14 mounted on the tire pneumatic valves of the automobile signal from the pneumatic pressure checkers 11 to 14 that the respective tire pressures have decreased and exceeded a predetermined threshold value. Is applied to the encoding circuit 16. The encoding circuit 16 obtains a predetermined identification code from the circuit 15 for the tire whose tire pressure has decreased, and performs an encoding process. Next, the output of the encoding circuit 16 is applied to the transmission circuit 17, and is transmitted as a radio signal, for example.

According to the second aspect of the present invention, since the digital encoding circuit is used and the terminal to which the input from the checker is applied is made different for each tire, a serial signal output string is formed for the transmission circuit. , The code is transmitted.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The identification code in the invention according to claim 1 is given according to a predetermined rule for each tire of each automobile.
A known identification code generation circuit is used. The identification code for each tire and the tire air pressure information are transmitted to the transmission circuit after being converted by the encoding circuit into a code string in which the former is first and the air pressure information is second.

Next, FIG. 2 is a diagram showing the configuration of an embodiment of the invention described in claim 2. In FIG. 2, 20
Is a multi-terminal encoding circuit (encoder), 21 to 29 are terminals for applying signals to be encoded, 30 is an output terminal for encoded signals, 31 is a switch circuit to which the output of the pneumatic checker is applied, 32 Indicates a positive voltage power supply terminal.

The terminals 21 to 28 are preliminarily labeled with the corresponding tires. For example, the last two digits of the engine serial number are assigned as binary codes to the terminals 21 to 26, and the terminals 27, 2
8 assigns the code of 00-11 to four tires.
Then, the terminal 29 is supplied with a code potential of, for example, "0" when the air pressure decreases and "1" when the air pressure is normal.

At this time, the code from the output terminal 30 becomes a 9-bit serial code string. The ninth bit of the code string is a code string that changes to "0" and "1" in response to the terminal 29 becoming "0" and "1". A transmission circuit (not shown) uses the code string to create a modulated signal and transmits it to the driver's seat. The receiver at the driver's seat is number 9 in the code string.
Corresponding to the bit "0" or "1", it can be easily determined whether each tire pressure is normal or decreased.

When using this encoding circuit, it is possible to give a different code string to each vehicle. 6 in the above example
The four types can be made different, and the code output has a small electric power, so that interference by other vehicles hardly occurs.

[0018]

As described above, according to the present invention, since each tire is provided with the encoding circuit and the transmitting circuit, even when the automobile is running, the tire is not inflated in any of the tires. It is possible to accurately know whether an abnormality has occurred.
And the necessary equipment can be used with little adjustment using commercially available products, so the overall cost is relatively low,
It can be easily attached to each car tire.

[Brief description of drawings]

FIG. 1 is a diagram showing a principle configuration of the present invention.

FIG. 2 is a diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 3 is a diagram showing a conventional technique.

[Explanation of symbols]

 11, 12, 13, 14 ... Pneumatic checker 15 ... Identification code generator 16 ... Encoding circuit 17 ... Transmission circuit

Claims (2)

[Claims] 1. A tire decompression warning device for transmitting a signal including a decrease in air pressure from an air pressure checker attached to a tire air valve of an automobile, which is received by a receiver and confirmed on a monitor. A coding circuit for applying a signal indicating that the tire pressure has decreased from the pneumatic pressure checker and a predetermined identification code for each tire, and a transmission circuit for transmitting the output of the coding circuit. And a decompression warning device for each tire, comprising: 2. A decompression warning device for each tire characterized in that the encoding circuit comprises a digital encoding circuit which uses an input application terminal of the encoding circuit in response to a signal from a pneumatic checker.