JPH0441106B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a device for determining whether or not the air pressure of an automobile tire is being measured properly without connecting any equipment. .

[Prior art and its problems]

The most common method for measuring air pressure in automobile tires is to connect a pressure gauge to the tire's air inlet, but there is also a method that measures tire pressure indirectly without connecting a pressure gauge to the tire. There is a way to do that. This method includes 1) measuring the height of the tire and making a judgment based on the amount of dent, and 2) measuring the ground contact area of the tire and making a judgment based on the amount of ground contact.

According to these methods, measurements can be made simply by installing the detection part of the device on the ground and stopping the car with the tires resting on it, which saves time and effort.

However, with this type of measuring device, if there is a lot of luggage on the bed of a truck, or if there are many people riding in a passenger car, the tires will be deformed due to the weight, so it will be abnormal even though it is not a puncture. There is a risk of misjudgment.

[Purpose of the invention]

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
When measuring air pressure indirectly without connecting a pressure gauge using the external deformation of the tire as a determining factor,
To provide a tire pressure determination device for an automobile that can accurately detect tire pressure by excluding appropriate tire deformation due to load.

[Key points of the invention]

However, according to the present invention, the purpose of the lever is to include an air pressure detection section that measures tire air pressure using external deformation of both left and right wheels of a vehicle as a determining factor, and an air pressure detection signal measured by the air pressure detection section that is transmitted to the left and right tires. The apparatus of the present invention includes a judgment circuit that compares the difference and judges that the balance is normal if the difference is less than a certain value, and that the balance is abnormal if it is more than a certain value, and a display device that displays whether the balance is appropriate or not based on the output from the judgment circuit. This is achieved by configuring.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of an automobile tire pressure determination device of the present invention, and FIG. 2 is a block circuit diagram of the same, showing an example in which the device of the present invention is installed at a gasoline filling station for an automobile.

In the figure, reference numeral 5 denotes a well-known gasoline refueling machine installed on an island 6. The exterior 5a houses devices such as a pump motor and a flow meter, and a refueling hose 5c with a refueling nozzle 5b at the tip and a refueling amount indicator 5d. and are installed. The device of the present invention is installed together with such a refueling machine 5, and includes air pressure detection units 1a to 1d buried in the ground surface, which constitutes a refueling area 7 in front of the island 6.
and a display device 4 that is attached to the exterior 5a of the refueling machine 5 or erected on the island 6 with a support.

The air pressure detection units 1a to 1d serve as means for measuring the air pressure of the tire based on the ground contact area of the tire,
It is a plate-type device with a large number of pressure contacts arranged in a dot shape, and is arranged on the front, back, left and right at intervals that match the tires of a car, making it possible to measure at least both the left and right wheels of a car at the same time.

The air pressure detection signals from these air pressure detection sections 1a to 1d are introduced into a balance judgment circuit 2 and an air pressure judgment circuit 3, respectively, and the output signals of the circuits 2 and 3 are introduced into a display device 4. This balance judgment circuit 2 is a circuit that compares the air pressure detection signals of the left and right detectors 1a and 1b or 1c and 1d, and determines that the difference is normal if it is less than a certain value, and that the balance is abnormal if it is more than a certain value. be. Further, the air pressure determination circuit 3 is a circuit that determines whether or not a predetermined air pressure is maintained based on the air pressure detection signal for each of the detection units 1a to 1d.

The display device 4 divides the output of the balance judgment circuit 2 into a total of four items, ie, the left and right wheels at the front and the left and right wheels at the rear, and displays the output of the balance judgment circuit 2 as "suitable" or "fail", etc., and also displays the output of the air pressure judgment circuit 3. shall be indicated as "excess, adequate, insufficient", etc.

Next, how to use the system will be described. When a car stops at the refueling area 7 for refueling, each tire is placed on the detection parts 1a to 1d, so that the air pressure of the tires can be directly measured. The detection units 1a to 1d measure the air pressure based on how much the tire is in contact with each contact dot, but the air pressure judgment circuit 3
Next, the preset standard values and each detection unit 1a to 1d
It is determined whether the air pressure of each tire is appropriate, too high, or too low, and the result is displayed on the display device 4. In addition, in the balance judgment circuit 2, each detection section 1a
Based on the air pressure detection signal from ~1d, the front left and right wheels and the rear left and right wheels are compared, and if the difference is within a preset value, it is determined that the condition is appropriate, and if it is outside the above value, the air pressure is balanced. It is determined that there is an abnormality because the
to be displayed. Then, by looking at the display device 4, even if the tire air pressure is abnormal, if the display results are the same for both the left and right tires, it can be determined that the tire is not punctured.

〔Effect of the invention〕

As described above, the automobile tire pressure determination device of the present invention indirectly measures the air pressure by external deformation of the tire without attaching a pressure gauge directly to the tire, and the air pressure of each tire is determined to be a normal value. Not only can you determine whether the tire pressure is balanced between the left and right tires, you can also determine whether the tire pressure is balanced between the left and right tires, so by combining these two determinations, you can properly eliminate tire deformation due to the load of luggage, etc. This allows you to know about abnormalities and make accurate judgments.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the automobile tire pressure determination device of the present invention, and FIG. 2 is a block diagram of the same. 1a-1b...Pneumatic pressure detection section, 2...Balance judgment circuit, 3...Pneumatic pressure judgment circuit, 4...Display device, 5...
Refueling device, 5a...Exterior, 5b...Refueling nozzle, 5c
...Refueling hose, 5d...Refueling amount display meter, 6...Island, 7...Refueling area.

Claims (1)

[Claims] 1 An air pressure detection unit that measures tire air pressure using the external deformation of both the left and right wheels of a vehicle as a determining factor, and the air pressure detection signal measured by the air pressure detection unit for the left and right tires is compared, and if the difference is less than a certain value, A tire pressure determining device for an automobile, comprising a determining circuit that determines that the balance is normal if it is, and that the balance is abnormal if it exceeds a certain value, and a display device that displays whether or not the balance is appropriate based on the output from the determining circuit.