JP2003175808A - Pressurized air filling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To compatibly provide the easy handling and weight reduction of a body. <P>SOLUTION: This pressurized air filling device comprises the body 21 and a stand 2. The body 21 comprises an input device 51, control means 35 and 38 controlling a pressurized air fed from a pressure vessel 22 to an air chuck 32 in such a manner that the actual tire internal pressure detected by a tire internal detecting means 37 corresponds with a set pressure displayed on a digital pressure gauge 51, and a secondary battery 46 to be a power supply for the input device 51 and the control means 35 and 38. The stand 2 is provided with a battery charger 13, an electric outlet 11, and an air connector 6. This device is so constituted that, when the body 21 is stored in the stand 2 connected to the both of an external power supply and a pressurized air feed source, the both of the filling of the pressurized intake air to the pressure vessel 22 and the filling to the secondary battery 46 are performed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for filling a tire provided in an automobile or an aircraft with pressurized air.

[0002]

2. Description of the Related Art When a tire is filled with pressurized air using an air inflator (pressurized air filling device) equipped with a Bourdon tube type pressure gauge, (a) an analog display is used to read a pointer. It takes some getting used to,
(B) Even though the set value of the tire internal pressure is specified in advance, the pressure to be filled cannot be set in advance, and the pressurized air can be sensibly injected or discharged while visually observing the movement of the pointer. There is a drawback that it needs to be carried out, and (c) it does not have a power supply so that it cannot be conveniently used for control and handling. Therefore, the power supply is supplied and the detected air pressure is displayed digitally. An air inflator to which various handling applications have been added has been developed (refer to the pamphlet of Air Mate AIR 150, published by Noguchi Corporation 2001).

(A) If the air pressure to be filled in the tire is preset, the tire is automatically stopped after being filled with the pressurized air up to the set pressure, and a buzzer notifies the end.

(B) When the unit of the tire internal pressure differs depending on the specifications of the automobile, such as kPa or kg / cm ² , the pressure display is switched to that unit.

[0005]

By the way, the conventional device for digital display has the following problems before the air inflator is ready for use.

Since the power source is not built in the main body, it is necessary to extend the electric cord attached to the main body and connect it to the commercial power source (AC100V) when using. In this case, if the place where the main body is used and the place where the commercial power source is connected to the electric outlet are far apart, the electric cord becomes long, and it is not preferable that the electric cord lie long. Also, long electrical cords are cumbersome.

Since the supply source of the compressed air is not built in the main body, it is necessary to connect the suction hose attached to the main body to the compressed air supply source at the time of use. In this case, if the place where the main body is used and the place where the main body is connected to the pressurized air supply source are distant from each other, the suction hose becomes long, and if the suction hose becomes long, a pressure drop occurs and sufficient pressure cannot be obtained. Also, long suction hoses are difficult to handle.

Therefore, a secondary battery, a charger for charging the secondary battery, and a pressure container capable of filling pressurized air are additionally incorporated in the main body, and the secondary battery is used when the main body is not in use. If the battery is charged and the pressurized container is filled with pressurized air, the rechargeable battery will be the power source and the pressurized container will be the source of pressurized air. Easy to handle in points.

However, since both the pressure vessel and the charger are heavy, if both are provided in the main body, the main body becomes heavy and it becomes difficult to carry.

Therefore, according to the present invention, only the secondary battery and the pressure container are provided in the main body, and the charger is provided in a stand separate from the main body. With the main body stored in the stand, the pressure container is filled with pressurized air. The purpose of the present invention is to achieve both easy handling and weight reduction of the main body by configuring so as to automatically charge the secondary battery.

On the other hand, the conventional digital display device has the following problems even after it is ready for use.

Since the set pressure of tires basically differs from vehicle to vehicle, at a gas station or tire shop where vehicles of different manufacturers, vehicle types, models, years, etc. randomly come, the set pressure is adjusted each time according to the vehicle visited. Must be entered. In this case, the driver may not remember the set pressure of the tire, and the set pressure may not be written on the car.Therefore, the set pressure may be unknown.At that time, the set pressure or empirical value is used as the set pressure. There is no choice but to input and it is unreliable.

The driver himself refuels to save labor,
The number of so-called self-refueling gas stations is increasing. It is conceivable that some of the customers who visit such a gas station may have a need to fill the tire with pressurized air. In that case, it is convenient and convenient if the main body is provided with a monitor screen and a guide for easily filling the tire with pressurized air is displayed on the monitor screen. However, an air inflator that displays such a guide has not been developed.

When air pressure in the tire is reduced due to air leakage, the tire will not be supported properly during a curve, and the side parts will bend each time the tire touches the ground. If it is possible to diagnose a tire air leak in accordance with the filling of pressurized air into the tire, it is convenient for safety measures. However, an air inflator capable of diagnosing an air leak from the tire in accordance with the filling of the tire with pressurized air has not been developed.

In view of the above items, the present invention has the following three features.
I also aim for one.

First object: The data of the tire set pressure of the vehicle is stored in the memory provided in the main body in correspondence with the specification of the vehicle, and when the tire is to be filled with pressurized air, the specification of the vehicle is set. By automatically setting the proper air pressure of the tire by inputting it from the input device, it matches the specifications of the vehicle trying to fill the tire with pressurized air without relying on the experience of the gas station man or the clerk of the tire shop. Enables optimum automatic filling of pressurized air.

Second purpose: A self-lubricating gas station by adding a monitor screen to the main body and displaying a guide on the monitor screen for easily filling the tire with pressurized air. Facilitates the filling of tires with pressurized air, even for visiting customers and inexperienced gas station operators.

Third object: After the tire is filled with pressurized air, the air leak from the tire is continuously judged and a necessary warning is issued if there is a leak, thereby increasing the reliability of the customer's store. It will help prevent accidents caused by insufficient air pressure.

[0019]

A first aspect of the present invention is a pressurized air filling device comprising a portable main body and a stand for accommodating the main body, wherein the main body can be filled with pressurized air. A pressure vessel (for example, an air tank), an air chuck for connecting to the air valve of the tire, an input device that can input the set pressure, a digital pressure gauge that digitally displays the set pressure input to this input device, and an actual The tire internal pressure detecting means for detecting the tire internal pressure, and a pressure container for supplying to the air chuck so that the actual tire internal pressure detected by the tire internal pressure detecting means and the set pressure displayed on the digital pressure gauge match. Control means for controlling the pressurized air from (for example, a solenoid valve and a control unit for controlling this), these input devices, digital pressure gauge, control means The stand comprises a secondary battery serving as a power source, while the stand is connected to a charger for charging the secondary battery, an electrical outlet for connecting an external power source, and a pressurized air supply source. With the air connector of
When the main body is housed in a stand to which both the external power source and the pressurized air supply source are connected, it is possible to fill the pressure vessel with pressurized air and the secondary battery together. Configured.

A second invention is a pressure vessel (for example, an air tank) capable of being filled with pressurized air, an air chuck for connecting to an air valve of a tire, and a vehicle (automobile or aircraft).
A memory that stores the tire setting pressure data associated with the vehicle specifications (manufacturer name, vehicle type, model, year if the vehicle is an automobile), an input device that can input vehicle specifications, Data retrieval means for retrieving tire setting pressure data corresponding to the vehicle specifications input to the input device from the memory, a digital pressure gauge for digitally displaying the setting pressure retrieved by the data retrieval means, and an actual tire From the pressure vessel that supplies the air chuck so that the tire internal pressure detecting means for detecting the internal pressure and the actual tire internal pressure detected by the tire internal pressure detecting means and the set pressure displayed on the digital pressure gauge match. Control means for controlling the pressurized air (for example, including a solenoid valve and a control unit for controlling the solenoid valve), these input devices, data extraction means, digital A secondary battery that serves as a power source for the pressure gauge and the control means, a charger that charges the secondary battery, an electrical outlet for connecting to an external power source, and a connection for the compressed air supply source. And an air connector.

In a third aspect of the invention, in the second aspect of the invention, the specification of the vehicle includes whether the vehicle is a front wheel or a rear wheel.

The fourth aspect of the invention includes the difference between the general traveling and the high speed traveling in the second aspect.

According to a fifth aspect of the present invention, in any one of the second to fourth aspects, a monitor screen is provided, and a guide for facilitating the filling of the tire with pressurized air is provided on the monitor screen. Display it.

In the sixth invention, the specification of the vehicle input to the input device in any one of the second to fifth inventions is accumulated as data together with the date and time, and the accumulated data can be taken out. Constitute.

A seventh aspect of the present invention provides a pressure container (for example, an air tank) capable of being filled with pressurized air, an air chuck for connecting to an air valve of a tire, an input device capable of inputting a set pressure, and an input device for the input device. The digital pressure gauge that digitally displays the input set pressure, the tire internal pressure detection means that detects the actual tire internal pressure, the actual tire internal pressure detected by the tire internal pressure detection means, and the digital pressure gauge displayed on the digital pressure gauge. Control means for controlling the pressurized air from the pressure vessel to be supplied to the air chuck so that the set pressure matches (for example, an electromagnetic valve and a control unit for controlling this), and the actual tire internal pressure by this control means. And the set pressure displayed on the digital pressure gauge match, and the judging means for judging whether or not there is air leakage from the tire continuously. From the result, warning means to issue necessary warning when there is air leakage, secondary battery as power source of these input device, digital pressure gauge, control means, judgment means, warning means, and charging to this secondary battery The battery charger is provided with an electric outlet for connection with an external power source, and an air connector for connection with a pressurized air supply source.

In the eighth invention, the external sound source is stored as data in any one of the second to seventh inventions, and the stored external sound source is displayed on the actual tire internal pressure and the digital pressure gauge. It is configured so that it can be used as a sound source for notifying that the set pressure that has been set matches or that the set pressure has been set.

In the ninth invention, the external sound source is stored as data in the seventh invention, and the stored external sound source is configured to be usable as a sound source for notifying that there is the air leak.

In the tenth aspect of the invention, in the invention of any one of the first to ninth aspects, when displaying the minimum digit (for example, a digit after the decimal point) on the digital pressure gauge, the minimum digit is rounded and displayed. Configure so that you can.

[0029]

According to the first aspect of the present invention, since the main body is provided with the pressure vessel as the pressurized air supply source and the secondary battery as the power source, the place where the pressurized air filling device is used, the commercial power source and the heating source are added. It is easier to handle than a conventional digital display device that required a long electric cord and a long suction hose when the place where the compressed air supply source is located is far away, and the charger is also part of the main unit. Since it is not necessary to carry it around, the weight of the main body is lighter than that in the case where the main body is also equipped with a charger, which makes it possible to achieve both easy handling and light weight of the main body.

According to the second aspect of the present invention, it is possible to automatically set the proper air pressure of the tire by inputting the specification of the vehicle whose tire is to be filled with the pressurized air with the input device. It is possible to automatically perform the optimum filling of pressurized air according to the specifications of the vehicle without depending on the above and without knowing the set pressure of the tire.

According to the third aspect of the invention, even when the tire set pressures may differ between the front wheels and the rear wheels of the vehicle, the front wheels,
Optimum automatic filling of pressurized air can be performed for each rear wheel.

According to the fourth aspect of the present invention, it is possible to automatically perform the optimum pressurized air filling according to the running condition.

According to the fifth aspect of the present invention, a guide for easily filling the tire with pressurized air is displayed on the monitor screen, so that a customer visiting a self-refueling gas station or an unskilled petrol Even a standman can easily fill the tire with pressurized air.

According to the sixth aspect of the present invention, since the accumulated data (data of actual usage) can be analyzed and processed, it can be used as data such as the type of vehicle used, usage time zone, usage frequency, etc. These data can be retrieved and used for customer management and marketing such as reviewing the default value of the pressurized air filling device, excess / shortage of equipment, target vehicle, and targeting direct mail.

According to the seventh aspect of the present invention, after the tire is filled with the pressurized air, the air leak from the tire is continuously judged and a necessary warning is issued if there is an air leak. It is possible to increase the property and further prevent accidents due to insufficient air pressure.

According to the eighth and ninth aspects of the invention, it is possible to set the sound source according to the preference of the person who uses the pressurized air filling device.

When the actual tire internal pressure from the tire internal pressure detecting means is displayed on the digital pressure gauge as it is, the display of the smallest digit may fluctuate frequently in a short time, and such fluctuation is troublesome. According to the tenth aspect of the present invention, the minimum digit is rounded and displayed within a range that does not hinder practical use, so that the numerical value of the digital pressure gauge becomes stable, which makes it easy for the user to use.

[0038]

1 is a front view of an air inflator 1 (pressurized air filling device) according to an embodiment of the present invention, and FIG. 2 is a left side view thereof.

The air inflator 1 is composed of a stand 2 which is installed or fixed, and a carrier 21 (main body) which is normally hung on the stand 2 to be stored and can be carried only when necessary.

The stand 2 is composed of an upright column 3, a leg 4 for supporting the column 3, and a straight tube-shaped hanger 5 for horizontally suspending the carrier 21. As shown in FIG. It has a U-shaped cross section.

An air connector (female) 6 is provided at the bottom of the column 3.
Corresponding to this, an air connector (male) 8 is provided on the upper surface of the hanger 5, and these are the column 3 and the hanger 5.
Are connected to each other via a pressurized air passage 7 (see FIG. 3) provided inside.

Here, the air connector 6 is a receiving port for the pressurized air from the pressurized air supply source. That is, when the air connector (female) 6 is connected to the air connector (male) 9 and the stop valve 10 is opened by the operator, pressurized air from a pressurized air supply source provided in a gas station, a tire shop, or the like is released. It is supplied to the pressurized air passage 7 in the stand 2.

Similarly, an electric outlet 1 is provided on the lower portion of the column 3.
1 is provided, and this electric outlet 11 is connected to a charger 13 located on the upper part of the pillar 3 through an electric wire 12 (see FIG. 3) provided inside the pillar 3 and the hanger 5. The charger 13 is for charging a battery 46 (secondary battery) incorporated in the control unit 26, which will be described later. When the electric plug 16 (see FIG. 3) is connected to the electric outlet 11, a commercial power source (AC100V) is used. ) Is supplied to the charger 13, and the charger 13 converts this alternating current into a direct current and outputs it.

On the other hand, the carrier 21 has a barrel-shaped air tank 22 for storing pressurized air to be put into a tire, a straight tubular handle column 23 fixed upright behind the air tank 22 as shown in FIG. 2, and a handle. It is composed of a straight tubular handle 24 that is bent substantially at a right angle from the column 23, a leg portion 25 that supports the air tank 22, and a control portion 26 that is provided above the air tank 22.

An air connector (female) 27 is provided on the lower surface of the handle 24 so as to face the air connector (male) 8. The air connector 27 is provided inside the handle 24 and the handle column 23 with a pressurized air passage 28. (See FIG. 3) via the air tank 22.

Similarly, the charging connector (female) 29 is provided on the lower surface of the handle 24 so as to face the charging connector (male) 15.
The charging connector 29 is provided with the electric wiring 14 (see FIG. 3) provided inside the handle 24 and the handle column 23.
(See) and is connected to the charger 13.

FIG. 3 is a configuration diagram showing both the air piping (thick line) and the electric wiring of the air inflator 1.

An air chuck 32 is provided at the tip of the pressurized air passage 31 from the air tank 22. Air chuck 32
Is connected to the tire valve 34 of the tire 33 to connect the tire 33
It is for introducing pressurized air into the inside. Since the air chuck 32 releases the pressurized air passage 31 to the atmosphere when it is not connected to the tire valve 34, it is necessary to shut off the tip of the pressurized air passage 31 from the atmosphere when checking the tank internal pressure, which will be described later. Therefore, a dummy air valve 71 (see FIG. 2) is provided at the tip of the handle 24, and when the air chuck 32 is connected to the dummy air valve 71, the tip of the pressurized air passage 31 and the atmosphere are shut off.

The pressurized air passage 31 is provided with a three-position three-way solenoid valve 35 driven by a signal from the control unit 38. In the following, among these three positions of the three-way solenoid valve 35, the position shown in the center in FIG. 3 is called the neutral position, the position shown in the upper stage is called the first offset position, and the position shown in the lower stage is called the second offset position.

The three-way solenoid valve 35 is always (in the neutral position)
Shuts off the pressurized air passage 31 on the upstream side of the valve to close the air tank 2
Although the pressurized air in 2 does not leak to the atmosphere,
When the first offset position is switched at the time of starting the filling of the tire 33 with the pressurized air, the pressurized air passages 31 in front of and behind the valve are communicated with each other, and the pressurized air in the air tank 22 is moved to the air chuck 3.
2. It is introduced into the tire 33 through the connection of the tire valve 34, and when the tire internal pressure is higher than the set pressure, it is switched to the second offset position, and the pressurized air in the pressurized air passage 31 is discharged to the outside of the passage 31. And discharge to reduce the tire internal pressure. Actually, as will be described later, the amount of the pressurized air toward the air chuck 32 is adjusted by the duty control using the first offset position and the neutral position, and the second offset position and the neutral position are used. The amount of pressurized air leaking to the outside of the pressurized air passage 31 is adjusted by the duty control of.

In order to know the tire internal pressure while the tire 33 is being filled with pressurized air, the air chuck 3 is provided downstream of the three-way solenoid valve 35.
A pressure sensor 37 (tire internal pressure detection means) is provided in the withdrawal passage 36 from the pressurized air passage 31 upstream of 2. The pressure sensor 37 converts the air pressure into an electric signal and outputs it to the control unit 38.

In order to confirm the pressure in the air tank 22, there is provided a passage 39 which connects the extraction passage 36 and the pressurized air passage 31 upstream of the three-way solenoid valve 35, and a branch portion of the passage 39 from the extraction passage 36. To check the tank pressure 6
4 includes a three-way valve 40 driven by 4. The manual three-way valve 40 connects the withdrawal passage 36 in front of and behind the valve when the tank internal pressure confirmation button 64 is returned (pulled), and at this time, the air chuck 32 is connected to both the dummy air valve 71 and the tire valve 34. If not, atmospheric pressure is guided to the pressure sensor 37. On the other hand, when the tank internal pressure confirmation button 64 is pushed in, the communication between the drawing passage 36 on the side of the pressurized air passage 31 and the drawing passage 36 on the side of the pressure sensor 37 is cut off, and instead the passage 39 and the side of the pressure sensor 37 are closed. At this time, the pressurized air in the air tank 22 is guided to the pressure sensor 37 in place of the atmospheric pressure, because it communicates with the extraction passage 36.

On the other hand, the charging connector 29 is connected to the battery 46 (secondary battery) through the electric wiring 45.
The battery 46 works as a power source for the control unit 38 and the operation / display panel 51.

As shown in FIG. 4, the operation / display panel 51 has the following arrangements.

A digital pressure gauge 52 for displaying the set pressure and the actual air pressure detected by the pressure sensor 37 is provided at the upper left of FIG. This digital pressure gauge 52
The unit of pressure to be displayed on is set by the unit setting button 53 located immediately to the right of the digital pressure gauge 52. For example, with this button 53, kPa and kgf which is the old unit
Units can be switched between / cm ² and / cm ² .

To the right of the unit setting button 53, the battery 4
A power switch 54 for supplying and shutting off power to the operation / display panel 51 and the control unit 38 from 6 is provided.

To the right of the power switch 54, a charging connector (female) 5 for charging the battery 46 even when the carrier 21 is not stored in the stand 2.
It is equipped with 5.

In the lower right part of FIG. 4, a filling start switch 56 for starting the filling of the tire with pressurized air.
However, around this, a normal end lamp 57 notifying that the filling is normally completed, an alarm lamp 58 notifying when the filling is not normally completed or an air leak is detected, and the filling is normally completed. A speaker 59 is provided for notifying the user of the absence or air leakage by sound such as a buzzer, an alarm melody, and a guide message.

In FIG. 4, a display 60 (monitor screen) for displaying handling instructions and warning contents is arranged at the lower left, and the up key 6 is located just above the display 60.
1, a down key 62 and an input key 63 are arranged. Here, the up key 61 is used to increase the set value of the air pressure displayed on the digital pressure gauge 52, and the display 60
Key to select the upper menu displayed in,
On the contrary, the down key 62 is a key for lowering the set value of the air pressure displayed on the digital pressure gauge 52 and for selecting a lower menu displayed on the display 60.
The input key 63 is a key for confirming the set value of the digital pressure gauge 52 selected by the up key 61 and the down key 62 and the work menu.

A tank internal pressure confirmation button 64 for confirming the internal pressure of the air tank 22 is provided on the right of these three keys 61, 62, 63. The tank internal pressure confirmation button 64 is for switching and driving the manual three-way valve 40 as described above.

Returning to FIG. 3, in the control unit 38 mainly composed of a microcomputer, the actual air pressure detected by the pressure sensor 37 is displayed on the digital pressure gauge 52 of FIG. To perform various controls and calculations, and store the obtained data in a memory (not shown).

Next, a general method of using the air inflator 1 of this embodiment will be described.

(1) General method of using the air inflator 1. Starting from the state where the air tank 22 is not filled with pressurized air, at this time, the following preparations 1 to 6 are performed. That is, procedure 1: The air connector (female) 6 of the stand 2 is connected to the air connector (male) 9, and the stop valve 10 is opened. When the stop valve 10 is opened, the pressurized air from the pressurized air supply source is supplied to the support column 3 of the stand 2 and the pressurized air passage 7 in the hanger 5, and reaches the air connector 8.
This air connector (male) 8 is an air connector (female) 2
Since the pressurized air passage 7 is shut off in the state where it is not connected to the pressurized air 7, the pressurized air does not leak from the air connector 8 to the outside.

Step 2: Also, the electric plug 16 for supplying commercial power (100V AC) to the electric outlet 11.
To secure a charging power source for the charger 13.

Step 3: When the carrier 21 is not stored in the stand 2, the handle 24 of the carrier 21 is lifted and the carrier 21 is hung on the hanger 5 of the stand 2 to store the carrier 21 in the stand 2. At this time, the air connectors 8 and 27, and the charging connector 15
And 29 are connected by the weight of the carrier 21 (see FIG. 2). By connecting the air connectors 8 and 27, the column 3, the pressurized air passage 7 in the hanger 5 and the handle 2 are connected.
4. The manual three-way valve 4 is communicated with the pressurized air passage 28 in the handle strut 23, and the three-way solenoid valve 35 is in the neutral position to block the communication of the pressurized air passage 31 before and after the valve.
0 is in a state where the passage 39 is blocked. As a result, the pressurized air is supplied to the air tank 22, and the air tank 22 is filled with the pressurized air. When a certain period of time elapses after the start of filling, the air pressure in the air tank 22 becomes the same as the air pressure of the pressurized air supply source, and the supply of pressurized air to the air tank 22 ceases.

Step 4: The power switch 54 on the operation / display panel 51 is switched from OFF to ON.

Step 5: The digital pressure gauge 5 on the operation / display panel 51 is turned on by turning on the power switch 54.
2 should display the default air pressure (default value), but if the digital pressure gauge 52 number is not displayed or the display is not clear, it means that the voltage of the battery 46 is low. Shows.
In this case, since the charging of the battery 46 is started in the charger 13 by connecting the charging connectors 15 and 29 in the procedure 3, the process waits as it is. After a while, the charging of the battery 46 is completed and the display of the digital pressure gauge 52 becomes clear.
Further, an initial screen showing a work menu is displayed on the display 60.

Step 6: The air valve 32 is connected to the dummy air valve 71 to cut off the communication between the tip of the pressurized air passage 31 and the atmospheric pressure, and the tank internal pressure confirmation button 64 on the operation / display panel 51 is pushed in, and the three-way manual operation is performed. The valve 40 is switched.
At this time, the communication between the drawing passage 36 on the side of the pressurized air passage 31 and the drawing passage 36 on the side of the pressure sensor 37 is blocked, and instead the passage 39 and the drawing passage 36 on the side of the pressure sensor 37 are made to communicate with each other, and the inside of the air tank 22 is closed. Since the pressurized air is guided to the pressure sensor 37, the actual air pressure from the pressure sensor 37 is displayed by the control unit 38 on the digital pressure gauge 52 on the operation / display panel 51. Whether or not the tank internal pressure is the specified pressure is confirmed by the digital pressure gauge 52, and if the specified pressure is insufficient, the process waits as it is. If the carrier 21 is housed in the stand 2, the air tank 22 should be filled with the pressurized air, so that the preparation is completed when the tank internal pressure reaches the specified pressure after a while. Therefore, the manual three-way valve 40 is switched to the state in which the passage 39 is closed by pulling the tank internal pressure confirmation button 64 back to the original position.

Next, the procedure for filling the tire with pressurized air will be described.

Step 7: Lift the handle 24 to remove the carrier 21 from the stand 2 and carry it to the side of the tire 34 of the vehicle to be filled with pressurized air.

Step 8: Remove the air chuck 32 from the dummy air valve 71 and connect it to the tire valve 34 of the tire 33.

Step 9: Confirm the unit of air pressure designated as the tire pressure of the automobile to be filled with pressurized air, and if the unit is different from the display unit of the digital pressure gauge 52, operate / display Unit setting button 5 on panel 51
Press 3 to match the unit of digital pressure gauge 52.

Step 10: Select "fill air pressure setting" from the work menu on the initial screen displayed on the display 60 using the up key 61 and the down key 62, and press the input key 63 to confirm the selected work. To do. It should be noted that the wording enclosed in “” indicates that the wording is displayed on the display 60.

Step 11: Up key 61 and down key 6
2 is used to set the value of the digital pressure gauge 52 to the desired air pressure, and the input key 63 is pressed to confirm the set pressure.

Step 12: Select "air filling start" from the work menu of the display 60 using the up key 61 and the down key 62, and press the input key 63 to confirm the work.

Step 13: Confirm that all preparations for filling pressurized air have been completed, and operate / display panel 51
Press the upper filling start switch 56. When the three-way solenoid valve 35 is switched from the neutral position to the first offset position by the control unit 38 which receives the signal from the filling start switch 56, the pressurized air passage 31 before and after the valve is communicated with the tire 33. Filling with pressurized air starts.

The following steps 14 to 17 are executed by the control unit 38.

Step 14: In the control unit 38, duty control is performed using the first offset position and the neutral position of the three-way solenoid valve 35 so that the tire air pressure set in Step 11 is obtained, and the air chuck 32 is operated. In addition to adjusting the amount of pressurized air going toward, the amount of pressurized air leaking to the outside of the pressurized air passage 31 is adjusted by performing duty control using the second offset position and the neutral position. The actual air pressure detected by the sensor 37 matches the set pressure. Then, at the timing when the both coincide with each other (or after a predetermined time after the coincidence), the duty control of the three-way solenoid valve 35 is stopped and the three-way solenoid valve 35 is returned to the neutral position to disconnect the communication of the pressurized air passage 31 before and after the valve. This completes the tire filling with pressurized air.

Step 15: Tire 3 after filling is completed
3. Determine if there is an air leak from 3. When the three-way solenoid valve 35 is returned to the neutral position at the timing when the filling is completed, the space from the tire 33 to the pressure sensor 37 becomes a closed space, and the tire internal pressure is detected by the pressure sensor 37. The amount of decrease in air pressure from the filling end timing is measured based on the signal from the pressure sensor 37, and the amount of decrease in air pressure is compared with a predetermined determination value.

Step 16: If the amount of decrease in air pressure is within the judgment value, it is judged that there is no air leakage from the tire 33 and the tire can be filled normally, the normal end lamp 57 is turned on, and the speaker 59 causes the melody of the normal end. , Make a sound or message.

Step 17: If the amount of decrease in air pressure exceeds the judgment value and is large, it is judged that there is a possibility of air leakage from the tire 33 and it is not normal termination, the alarm lamp 58 is turned on, and a warning melody is output from the speaker 59. Make a sound or message.

Step 18: If not normally filled, check whether there is air leakage from the air chuck 32 and whether the tire valve 34 of the tire 33 or the tire 33 is damaged, and if there is damage. After repairing it, and again when there is no air leakage, the procedure returns to the above-mentioned step 8 again and the pressurized air filling operation is performed.

Step 19: When the filling in the procedure 18 is completed normally or the filling is completed normally in the procedure 16, the power switch 54 on the operation / display panel 51 is turned on to end the filling operation. Switch from ON to OFF,
The air chuck 32 is removed from the tire valve 34 of the tire 33.

Step 20: Repeat the steps 8 to 19 for each tire, carry the carrier 21 to the stand 2 after the completion of the filling work for all the tires, and fill the tires of the next car to come. In preparation for this, the carrier 21 is stored in the stand 2.

Next, the control unit 26 is provided with the functions of (2) display instruction of instruction manual and (3) rounding operation of digital display value. This will be described in order.

(2) Display display of instruction manual This is because the handling operation procedure is displayed on the display 60 on the operation / display panel 51 by the control unit 38, so that the user such as the driver can add the tire to the tire. This is a function for enabling the filling of compressed air. The display 60 on the operation / display panel 51 is also used to guide the steps 3 to 20 described above. The work performed by the user and the display on the display that changes accordingly will be described.

Step 21: When the user switches the power switch 54 on the operation / display panel 51 from OFF to ON while the carrier 21 is stored in the stand 2, if the battery 46 has a certain voltage or more, the control unit 3
The display 60 displays "power supply is normal" in accordance with 8.

Step 22: When the battery 46 is below a certain voltage in Step 21, the control unit 38 displays "Please charge because the voltage is insufficient". At this time, if the electric plug 16 is not connected to the electric outlet 11 and the user notices this and connects the electric plug 16 to the electric outlet 11, the charger 13 starts charging the battery 46. As a result, the battery 4
When charging to 6 is completed, the control unit 38 causes the display 60 to display “normal power supply”.

Step 23: Next, the control unit 38 displays "Connect the air chuck to the dummy air valve and then push the tank internal pressure confirmation button to confirm the air pressure" on the display 60. When the user presses the tank internal pressure confirmation button 64 and switches the manual three-way valve 40 according to this instruction, the communication between the drawing passage 36 on the side of the pressurized air passage 31 and the drawing passage 36 on the side of the pressure sensor 37 is cut off, and instead the passage is formed. Since 39 and the drawing passage 36 on the pressure sensor 37 side are communicated with each other, the pressurized air in the air tank 22 is guided to the pressure sensor 37. As a result, the detected value from the pressure sensor 37 is taken into the control unit 38, and if the detected tank value is equal to or higher than a certain pressure, the control unit 38 displays "normal tank air pressure" on the display 60. After confirming this display, when the user pulls the tank internal pressure confirmation button 64 to return it to its original position, the manual three-way valve 40 is switched and the passage 3
The communication between the pressure sensor 37 side and the drawing passage 36 on the pressure sensor 37 side is blocked, and the drawing passage 36 on the pressure sensor 37 side and the drawing passage 36 on the pressurized air passage 31 side communicate with each other. On the other hand, if the pressure is below a certain level, the control unit 38 displays "please fill the tank with sufficient air pressure", so wait as it is. In this case, the user can use the air connector 6
If the two are connected when they are not connected and the stop valve 10 is opened while the stop valve 10 is closed even if both are connected, the tank internal pressure will eventually become high. I'm becoming. Since the pressure at this time is detected by the pressure sensor 37, when the tank internal pressure becomes equal to or higher than a certain pressure, the control unit 38 displays “normal tank air pressure” on the display 60.
Is displayed. Also at this time, the user pulls the tank internal pressure confirmation button 64 to return it to its original position, whereby the manual three-way valve 40 is switched to the state in which the passage 39 is blocked.

Step 24: After confirming the display of "normal power supply" and "normal tank air pressure", the user sets the carrier 21
Remove the stand 21 from the control unit 38
As a result, regardless of the power switch 54, the power supply from the battery 46 to the operation / display panel 51 is cut off, and the display on the display 60 disappears.

When the carrier 61 is carried to the side of the tire of the automobile to be filled and the power switch 54 is switched from OFF to ON again, in response to this operation, the control unit 38 causes the display 60 to display "Connect the air chuck to the tire valve. Please set the air pressure with "is displayed.

Step 25: Seeing this display, the user removes the air chuck 32 from the dummy air valve 71 and connects it to the tire valve 34.

Step 26: Next, the user presses the up key 61,
The display of the digital pressure gauge 52 is adjusted to the air pressure to be filled by using the down key 62, and the input key 63 is pressed. In response to this operation, the control unit 38 displays “Please press the filling start button” on the display 60. .

Step 27: The user operates this device while viewing this display.
When the filling start button 56 on the display panel 51 is pressed, in response to this operation, the control unit 38 starts duty control using the three-way solenoid valve 35 to start the tire 33.
Is filled with pressurized air, and then the pressure sensor 37
When the pressure value detected by the control unit 38 reaches the air pressure displayed on the digital pressure gauge 52, the duty control by the control unit 38 using the three-way solenoid valve 35 is completed, the control unit 38 is returned to the neutral position, and the normal end lamp 57 is turned on. It At the same time, the display 60 displays "Filling has been completed normally" and "Please remove the air chuck", and the speaker 59 on the operation / display panel 51 emits a melody, sound or message indicating normal completion.

Step 28: If the pressure value detected by the pressure sensor 37 does not reach the air pressure displayed on the digital pressure gauge 52 even after the lapse of a predetermined time after pressing the filling start button 56, the control unit 38 It is determined that the process did not end normally, the alarm lamp 58 is turned on, the alarm sound is emitted from the speaker 59, and the display 60 displays "There is a risk of tire pressure leak. Please check." It When the user presses the filling start button 56 after checking this display, the control unit 38 fills the tire 33 with pressurized air, and the pressure value detected by the pressure sensor 37 is the digital pressure. When the air pressure displayed on the total 52 is reached, the control unit 38 returns the three-way solenoid valve 35 to the neutral position, and the normal end lamp 57 is turned on. Further, the display 60 displays "Filling has been completed normally" and "Please remove the air chuck".

Step 29: When the user removes the air chuck 32 while looking at the display "Please remove the air chuck" in steps 27 and 28, the control unit 38 receives this operation and opens the atmosphere. By the way, "finished work" is displayed on the display 60.

Step 30: Repeat the steps 24 to 29 for the remaining tires that have not yet been filled, and after completing the filling operation for all the tires, carry the carrier 21 to the stand 2 and carry 21
Is stored in the stand 2.

(3) Rounding of digital display value The actual pressure value from the pressure sensor 37 is measured by the digital pressure gauge 5
When the number is displayed as it is, the display of the smallest digit may change frequently in a short time, and such a change in the numerical value may be troublesome. The function for rounding the digital display value is to display the operation procedure on the display 60 on the operation / display panel 51 by the control unit 38 to stabilize the minimum digit so that the user can easily use it within a range where there is no practical problem. Is. The work performed by the user and the display on the display that changes accordingly will be described.

Step 31: From the menu displayed on the display 60 on the operation / display panel 51, "setting of display value" is selected / confirmed by using the up key, the down key and the input key. This selection / confirmation operation causes the display 6
The following five display modes are displayed by the control unit 38 as submenus on the 0.

No. 1 mode: Round off the least significant digit (default), No. 2 mode: rounding down of the least significant digit, No. 3 mode: rounding up to the lowest digit, No. 4 mode: Display of 0 or 5 by rounding up the least significant digit, No. 5 modes: No operation (calibration mode), Step 32: Select one of the 5 displayed modes using the up key, down key, and input key, and receive this selection and confirmation signal. The pressure sensor 37 is controlled by the control unit 38 in accordance with the selection / confirmation signal.
Rounding off, rounding down the air pressure detected by
A calculation such as rounding up is performed, and the result is displayed on the digital pressure gauge 52.

Next, the control unit 26 is provided with a card reader 64 capable of reading the data of the memory card (see FIGS. 1 and 2). By using this card reader,
It is possible to use (4) use of external database, (5) use of external sound source, and (6) use of actual usage data. This will be described in order with reference to FIG.

(4) Importing an External Database The work performed by the user and the display on the display that changes accordingly will be described.

Step 41: From the data sheets 61A and 61B such as the vehicle specification table and the maker catalog, the maker, the vehicle type, the model,
Examine the data of year and tire set pressure to extract necessary items. When the tire set pressures are different between the front wheels and the rear wheels and between the normal running and the high speed running, they are also extracted.

Step 42: The extracted data is sent to the personal computer 62.
To write to the database file.

Step 43: The written data is further transferred to the memory card 63 such as a memory stick.

Step 44: With the memory card 63 housed in the card reader 64 provided in the carrier 21,
When "Capture of data" is selected and confirmed from the menu of the display 60 on the operation / display panel 51 using the up key, the down key and the input key, the control unit 38 transfers the data to the memory card 63 via the card reader 64. The read data is read, and the data is stored in the memory attached to the control unit 38.

In the air inflator 1 having the memory storing the data extracted from the vehicle specification table and the maker catalog in this way, the tire 33 of the vehicle can be filled with the pressurized air according to the following procedure. That is, step 45: the display 60 on the operation / display panel 51
From the menu, select "Set tire filling air pressure data" using the up key, down key and input key and confirm.

Step 46: In response to the step 45, the control unit 38 causes the display 60 to display the maker, vehicle type,
The model, year, front wheel, rear wheel, general driving, and high speed driving are sequentially instructed. Therefore, according to the instructions on the display 60, the manufacturer, vehicle type, model, year, front wheel, rear wheel Select whether or not to use the up key, the down key, and the input key to select and confirm the normal mode, the general mode, or the high speed mode.

Step 47: The control unit 38 for inputting the selected and fixed vehicle specifications retrieves the proper air pressure for the tire of the selected and fixed vehicle specifications from the extracted data stored in the memory. Digital pressure gauge 5 as the air pressure to be filled with the retrieved set pressure
It is displayed in 2.

Step 48: If the general usage is followed from here, the same operation as steps 12 to 20 in (1) above is performed to complete the filling operation. Alternatively, if the instruction displayed on the display is followed, the same operation as steps 26 to 30 in (2) above is performed to complete the filling operation.

(5) Utilization of External Sound Source The operation performed by the user and the display on the display that changes accordingly will be described. This is the same as the utilization of the external database in (4).

Step 51: Internet, CD-ROM
Alternatively, a sound source (external sound source) such as a melody that is desired to be used for normal termination or an alarm is extracted from the sound sources 65A and 65B created by oneself.

Step 52: The extracted sound source is loaded into the personal computer 62.

Step 53: The taken sound source is transferred to a memory card 63 such as a memory stick.

Step 54: With the memory card 63 accommodated in the card reader 64 provided in the carrier 21,
From the menu of the display 60 on the operation / display panel 51, "acquire sound source" is selected / confirmed with the up key, the down key, and the input key. At this time, the sound source transferred to the memory card 63 is read by the control unit 38 via the card reader 64, and the data is stored in the memory attached to the control unit 38.

The sound source stored in this manner can be used as a sound source for the normal termination, filling, and alarm according to the following procedure. That is, step 55: the display 60 on the operation / display panel 51
From the menu, select and confirm "Select sound source" using the up key, down key, and input key.

Step 56: In response to the step 55, the control unit 38 instructs the display 60 to normally end, filling, and input of another alarm sound source. Use the up key, the down key, and the input key to select and confirm which of the sound source of the inside and the alarm is to be set.

After the steps described above are performed, steps 16 and 17 in the above (1) and steps 27 and 28 in the above (2).
The selected and confirmed sound source is emitted from the speaker 59 on the operation / display panel 51.

(6) Utilization of Utilization Actual Data The operation performed by the user and the display on the display which changes accordingly will be described.

Step 61: Select in step 46 of (4) above.
The fixed manufacturer, vehicle type, model, year, front wheel, rear wheel, and other data for general driving and high-speed driving, and the value set as tire pressure are stored in the control unit 38 together with the date and time data. (Eg EEPROM)
Save (accumulate) in.

Step 62: The stored data is selected / confirmed from the menu of the display 60 by using the up key, the down key and the input key, and the memory card 63 is stored in the card reader 64. The stored data is transferred to this memory card 63.

Step 63: The memory card 63 is taken out of the card reader 64 and stored in the card reader of the personal computer 62, and the data transferred to the memory card 63 is written in the database file of the personal computer 62.

Since the data written in the database file in this way is the usage record data, this usage record data is analyzed and processed to determine the type of vehicle used, the set air pressure, the usage time zone, and the usage. Data such as frequency is taken out, the default value of the air inflator 1 is reviewed, excess and deficiency of equipment, target vehicle,
The direct mail 66 can be used as customer management such as narrowing down the target and marketing data.

In this embodiment, with this configuration, the following effects can be obtained.

Effect 1: According to the present embodiment, the carrier 21
Since the (main body) includes the air tank 22 (pressure container) as a pressurized air supply source and the battery 46 (secondary battery) as a power source, a place where the air inflator 1 (pressurized air filling device) is used and a commercial It is easier to handle compared to the conventional digital display device that requires a long electric cord and a long suction hose when the power source and the place where the pressurized air supply is located are far away, and the charger 13 is a carrier. 21
Since it is not necessary to carry it as a part of the carrier 21, the weight of the carrier 21 is lighter than that in the case where the charger 13 is also provided in the carrier 21, which makes it easy to handle and to reduce the weight of the main body.

Effect 2: By inputting the specification of the automobile (vehicle) whose tires are to be filled with pressurized air from the operation / display panel 51 (input device), it becomes possible to automatically set an appropriate tire pressure. As a result, it is possible to automatically perform the optimum filling of the pressurized air according to the specifications of the vehicle without depending on the experience of the gas station man and without knowing the set pressure of the tire.

Effect 3: Since the specification of an automobile includes whether it is a front wheel or a rear wheel, even if the tire set pressure may differ between the front and rear wheels of an automobile, it is optimal for each of the front and rear wheels. Automatic filling of pressurized air can be performed.

Effect 4: Since the specification of the automobile includes whether the vehicle is traveling normally or traveling at high speed, it is possible to automatically perform the optimum filling of the pressurized air according to the traveling state.

Effect 5: Since a guide for easily filling the tire with pressurized air is displayed on the operation / display panel 51 (monitor screen), a self-refueling gas station is visited. Even a customer or an inexperienced gas station operator can easily fill the tire with pressurized air.

Effect 6: By inputting the specification of the automobile (vehicle) whose tires are to be filled with pressurized air from the operation / display panel 51 (input device), it is possible to automatically set an appropriate tire air pressure. However, since the specification of the car and the value set as the tire air pressure are stored in the built-in memory of the control unit 38 together with the date and time data, the stored data can be taken out. By analyzing and processing this saved data (use record data), it is possible to retrieve it as data such as the type of car used, time of use, frequency of use, etc., and review these default values for the air inflator 1. For customer management and marketing such as overs and shorts of equipment, target vehicles, narrowing down direct mail targets, etc. It is possible to use.

Effect 7: After the tire is filled with pressurized air, the air leak from the tire is continuously judged and a necessary warning is issued if there is a leak, so that the reliability of the customer's store is increased and the air pressure is further increased. It can help prevent accidents caused by shortages.

Effect 8: The external sound source is stored as data, and the stored external sound source is normally terminated (the actual tire internal pressure and the set pressure displayed on the digital pressure gauge 52 are the same), and filling is performed. Medium (Before the actual tire internal pressure and the set pressure displayed on the digital pressure gauge 52 match), Abnormal termination (whether the actual tire internal pressure does not match the set pressure displayed on the digital pressure gauge 52) Since it is configured to be usable as a sound source for notifying that there is air leakage), it is possible to set a sound source that suits the taste of the person who uses the air inflator 1.

Effect 9: When the actual tire internal pressure from the pressure sensor 37 (tire internal pressure detecting means) is displayed on the digital pressure gauge as it is, the display of the minimum digit may frequently change in a short time. Although it is cumbersome, according to the present embodiment, the numerical value of the digital pressure gauge is stable by rounding and displaying the number of the smallest digit within the range where there is no practical problem, which makes it easy for the user to use. ing.

In addition to the features described in the embodiment, the control unit 26 may have the following functions.

(7) Zero shift function This is because when the air chuck 32 is not connected to the tire valve 34 or the dummy air valve 71 and is open to the atmosphere, "1" may be displayed in the minimum digit of the digital pressure gauge 52. This is a function that always displays "0" so that it will not be displayed. However, the display mode is No. It works in the calibration mode which is 5 modes.

(8) Function for improving measurement accuracy When the standard prototype for pressure measurement is Xan [Pa] (however, n
Is an integer), the output of the detection element (strain gauge) of the pressure sensor 37 is Yan [mV], and when the display value of the digital pressure gauge 52 is Zan [Pa] for that output, X at this time
The output of Yan and Za so that an and Zan have the same value.
The relationship between the display values of n is stored, and this is stored in the digital pressure gauge 5
The digital values from the minimum value to the maximum value of 2 are continuously stored.

As a result, the table shown in FIG. 6 is created, and by using this table, it is possible to obtain high accuracy equivalent to the standard prototype.

In the embodiment, the description has been made for the automobile, but the present invention is not limited to this, and an aircraft or a construction machine is also applicable as long as it has a tire.

[Brief description of drawings]

FIG. 1 is a front view of an air inflator according to an embodiment of the present invention.

FIG. 2 is a left side view of the air inflator according to the embodiment.

FIG. 3 is a configuration diagram showing both air piping and electric wiring of an air inflator.

FIG. 4 is an enlarged plan view of an operation / display panel.

FIG. 5 is a diagram for explaining the usage of external data and an external sound source, and the usage of actual usage data.

FIG. 6 is a table showing the relationship between the pressure value of a standard prototype, the output of a strain gauge, and the pressure value of a digital pressure gauge. 1 Air Inflator (Pressurized Air Filling Device) 2 Stand 13 Charger 21 Carrier (Main Body) 22 Air Tank (Pressure Vessel) 26 Controller 32 Air Chuck 35 Three-way Solenoid Valve (Control Means) 37 Pressure Sensor (Tire Inner Pressure Detection Means) 38 Control unit (control means) 40 Manual three-way valve 41 Battery (secondary battery) 52 Digital pressure gauge 60 Display (monitor screen)

Claims (10)

[Claims] 1. A pressurized air filling device comprising a portable main body and a stand for accommodating the main body, wherein the main body is connected to a pressure container capable of filling pressurized air and an air valve of a tire. Air chuck, an input device that can input the set pressure, a digital pressure gauge that digitally displays the set pressure input to this input device, a tire internal pressure detection unit that detects the actual tire internal pressure, and this tire Control means for controlling the pressurized air from the pressure vessel supplied to the air chuck so that the actual tire internal pressure detected by the internal pressure detection means and the set pressure displayed on the digital pressure gauge match, and these inputs The stand comprises a device, a digital pressure gauge, and a secondary battery that serves as a power source for the control unit, while the stand connects the charger for charging the secondary battery and an external power source. And an air connector for connection with a pressurized air supply source, and when the main body is housed in a stand to which the external power source and the pressurized air supply source are connected together, A pressurized air filling apparatus, characterized in that the pressure vessel is filled with pressurized air and the secondary battery is filled together. 2. A pressure container capable of being filled with pressurized air, an air chuck for connecting to an air valve of a tire, a memory for storing data of a tire set pressure of a vehicle in association with the specification of the vehicle, and a vehicle An input device capable of inputting the specifications of the vehicle, data fetching means for fetching the tire set pressure data corresponding to the vehicle specifications inputted to the input device from the memory, and the set pressure fetched by the data fetching means is digitally output. The digital pressure gauge displayed by, the tire internal pressure detection means for detecting the actual tire internal pressure, and the actual tire internal pressure detected by the tire internal pressure detection means and the set pressure displayed on the digital pressure gauge are matched. Control means for controlling the pressurized air from the pressure vessel supplied to the air chuck, and these input device, data extraction means, digital pressure gauge A secondary battery as a power source for the control means, a charger for charging the secondary battery, an electrical outlet for connection with an external power source, and an air connector for connection with a pressurized air supply source. A pressurized air filling device comprising: 3. The pressurized air filling device according to claim 2, wherein the specification of the vehicle includes whether the vehicle is a front wheel or a rear wheel. 4. The pressurized air filling device according to claim 2, further comprising whether the vehicle is traveling normally or traveling at high speed. 5. A monitor screen is provided, and a guide for facilitating the filling of the tire with pressurized air is displayed on the monitor screen. Pressurized air filling device. 6. The vehicle specifications input to the input device are stored as data together with the date and time, and the stored data can be taken out. Pressurized air filling device. 7. A pressure container capable of being filled with pressurized air, an air chuck for connecting to an air valve of a tire, an input device capable of inputting a set pressure, and a set pressure input to the input device digitally. The digital pressure gauge to be displayed, the tire internal pressure detecting means for detecting the actual tire internal pressure, and the actual tire internal pressure detected by the tire internal pressure detecting means and the set pressure displayed on the digital pressure gauge are matched. Control means for controlling the pressurized air from the pressure vessel supplied to the air chuck, and air leakage from the tire after the actual tire internal pressure and the set pressure displayed on the digital pressure gauge match by this control means. There is a judging means for judging whether or not there is a warning, a warning means for issuing a warning necessary when there is an air leak based on the judgment result, these input devices, digital pressure A secondary battery that serves as a power source for the control means, the determination means, and the warning means, a charger that charges the secondary battery, an electrical outlet for connecting to an external power source, and a pressurized air supply source. A pressurized air filling device, comprising: an air connector for connection. 8. An external sound source is stored as data, and
The stored external sound source is configured to be usable as a sound source for notifying that the actual tire internal pressure and the set pressure displayed on the digital pressure gauge match or before they match. The pressurized air filling device according to any one of claims 2 to 7. 9. An external sound source is stored as data, and
8. The pressurized air filling device according to claim 7, wherein the stored external sound source is configured to be usable as a sound source for notifying that there is the air leakage. 10. The digital pressure gauge according to claim 1, wherein when the minimum digit is displayed, the digit of the minimum digit can be rounded and displayed. Pressurized air filling device.