JPH0671844B2 - Air filling method and air filling device for tire - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air filling method and an air filling device for a tire which can be filled easily and quickly when the tire is filled with air at a predetermined set pressure.

[0002]

2. Description of the Related Art Conventionally, in order to fill a tire with air at a predetermined set pressure, a stationary air filling device fixed to a specific place or a portable air that can be freely moved to the vehicle side. Filling device is used and its display (gauge)
For example, analog type with mechanical meter,
Digital type electronic components have been proposed.

In actual filling, an air supply source adjusted to the same pressure as the set value of the tire is connected to the tire, and when a steady state is established between the two, the target set tire pressure is reached. A method of observing, supplying a certain amount of air to the tire in advance, measuring the change in internal pressure of the tire,
A method has been proposed in which the measurement result and the air supply amount up to a target set pressure of the tire are calculated to fill the set pressure.

[0004]

However, the above-mentioned conventional apparatus and method have the following problems to be improved. For example, compared to a stationary air filling device, a portable filling device can be easily moved to the vehicle tire side, so it is easy to use, but if the display part is a mechanical meter, the visibility is There was a problem such as bad. On the other hand, in the case of the digital display type using recent electronic parts, there are various excellent advantages such as being easy to see, and the entire display can be downsized despite the large display section. Great utility value can be expected when combined with the filling device.

On the other hand, as a filling function of the apparatus, in the filling method for bringing both the air supply source adjusted to the same pressure as the set value of the tire and the actual filled tire pressure to a steady state, the air supply is performed. However, when the pressure difference between the two decreases, the air supply amount drastically decreases, and it takes a considerable time to reach the target set value. Therefore, in actual use, the filling is stopped at an appropriate place (on the way). In addition, by supplying a certain amount of air to the tire in advance, calculating the air supply amount from the change in the tire internal pressure to the set pressure of the tire, and filling the method, a plurality of There was a problem that the filling operation was repeated a number of times and a correction operation for several times was required, which was still insufficient.

The present invention has been made in view of such conventional problems. And, the point that is a major feature is that the tire volume is obtained from the pressure drop of this air supply source due to the initial filling using an air supply source such as a tank whose volume and filling pressure are known, and from this, further setting of the tire There is a method and an air filling device for finding a filling pressure lowering point of an air supply source until reaching a pressure, and then filling air until the filling pressure lowering point reaches a desired setting pressure. .

[0007]

More specifically showing such means of the present invention, one of them is a method of filling air into a tire for filling a tire with air at a predetermined set pressure,
From an air supply source having a known filling pressure higher than the volume and at least the set pressure of the tire, when the tire pressure of the tire is lower than the set pressure, supply air to the tire, and the filling pressure of the air supply source is While the supply of air is stopped when it drops to a predetermined value, the tire pressure is detected, and the tire volume is calculated from the initial filled tire pressure, the volume of the air supply source and the reduced filling pressure due to air supply, while the volume is calculated. From the value, the filling pressure lowering point of the air supply source until the tire pressure reaches the predetermined set pressure is calculated, whereby the air supply from the air supply source is restarted until the filling pressure lowering point. Then, the tire is filled with air at a predetermined set pressure.

Another aspect of the present invention is that an air chuck is detachably attached to an air inlet of a tire, an air supply source whose volume and at least a filling pressure higher than a set pressure of the tire are known, and the air. A supply source and an opening / closing valve installed in the air supply path of the air chuck, a tire pressure sensor that detects a tire pressure, a filling pressure sensor that detects a filling pressure of the air supply source, and a tire pressure setting and display. With the section, the detection data from the tire pressure sensor and the filling pressure sensor are input, and by the built-in computer,
A tire air filling device comprising: a control unit that controls the on-off valve to fill the tire with air up to a predetermined set pressure.

[0008]

In the air filling method of the present invention, the filling pressure lowering point of the air supply source until reaching the set pressure of the tire is calculated by the initial air supply from the air supply source. Moreover, the air can be filled up to the target set pressure in a short time. Further, the air filling device of the present invention can obtain such an excellent filling function.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of an entire embodiment of an air filling device for a tire according to the present invention.
In the figure, 1 is an air chuck detachably attached to an air inlet of a target tire, 2 is an air supply source such as an air tank having a known volume and filling pressure, 3
Is an opening / closing valve composed of an electromagnetic valve or the like installed in an air supply path 4 between the air supply source 2 and the air chuck 1.
Is a tire pressure sensor installed in an appropriate position of the air supply path 4 for detecting a tire pressure, 6 is a filling pressure sensor for detecting a filling pressure of the air supply source 2, 7 is an air supply unit to the air supply source 2, 8 Is a control unit of the apparatus including electronic parts, 9 is a battery for the control unit when the apparatus is portable as shown in FIG. 2, and 10 is a charger.

The control section 8 has electronic components such as a one-chip computer for control built therein, and receives detection data from the tire pressure sensor 5 and the filling pressure sensor 6 of the air supply source 2. It is supposed to be done. Further, on the surface thereof, for example, a tank internal pressure display portion 8a of the air supply source 2 and a setting / tire pressure display portion 8b for displaying the set pressure and the tire pressure (internal pressure) when the tire pressure is set are installed digitally. In addition, a pressure type pressure setting switch 8c for setting tire pressure, other,
A required power switch 8d and the like are installed.
Further, the open / close valve 3 is controlled by an output signal from the control section 8.

The above-mentioned respective parts are summarized as a portable air filling device as shown in FIG. 2 described above. In the case of this device, an appropriate number of leg portions 11 are fixed to the lower half of the tank 2 so that they can stand by themselves. The control portion 8 is arranged on the upper surface of a relatively large U-shaped frame 12 fixed to the tray portion 2a above the tank. Therefore, the control portion 8 is located at a fairly high portion, is easy to see, and at the same time, is appropriately separated from the high pressure portion of the tank 2, so that high safety is obtained. Further, the forked portion 1 is provided on the upper free end side of the U-shaped frame 12.
2a is provided, and the grip 13 is configured by a shaft pin axially mounted between them. Therefore, it can be lifted and moved easily. A chuck holder 14 for sandwiching the air chuck 1, for example, is attached to an appropriate side of the U-shaped frame 12.

Further, an injection port 15 of the air supply unit 7 of the tank 2 is installed at a portion below the upper horizontal portion of the U-shaped frame 12 (bottom surface side) where the entire apparatus can be balanced. is there. The injection port 15 has a structure as shown in FIG.
When placed on the air supply valve 17 portion attached to the end of the horizontal portion of the character-shaped arm 16a, the entire device is stably suspended, and at the same time, the movable pin 15a is pushed up to establish electrical continuity, and compressed air from the outside is compressed. Is filled into the tank 2 at a predetermined filling pressure through the inlet 18 of the tank stud 16 and the hollow inside of the L-shaped arm 16a. That is, the automatic filling is performed by simply suspending the L-shaped arm 16a after the air in the tank 2 is used.

Next, the air filling method according to the present invention using the air filling device thus constructed will be described with reference to FIG.
~ It will be described based on the flowchart of FIG. First, the power is turned on in step S ₁ , and the tire set pressure is set as a set value (Tps) in step S ₂ . This is performed by the pressing type pressure setting switch 8c. Thereafter, it started in step S _3, the tire pressure sensor 5 at Step S _4, detects the tire pressure of the front air-filled (Tp _1),
The control unit 8 is made to input this value and step S ₅
Is compared with the set pressure (Tps).

In this comparison, when Tps = Tp ₁ ,
Since it means that the tire pressure is equal to the set pressure before the air filling, the filling operation of at least one tire is finished immediately. On the other hand, when Tps <Tp ₁ , it means that the tire pressure before air filling is already higher than the set pressure, and therefore the exhaust system described later is entered. When Tps> Tp ₁ , the tire pressure before filling air is lower than the set pressure and air needs to be filled. Therefore, in step S ₆ , the opening / closing valve 3 is opened to fill the tank 2 with air. The filling pressure of the tank 2 at this time is set to, for example, about 10 Kg / cm ² . Although the tire pressure varies depending on the vehicle type, in a typical passenger car or the like, the tire pressure is about 1.5 to 2.5 Kg / cm ² , and thus the filling pressure is sufficient.

In step S ₇ , this filling causes the filling pressure of the tank 2 to reach a predetermined value (for example, 0.1 Kg / cm ^2).
(Below), the filling pressure sensor 6 detects this decrease and causes the control unit 8 to input it.
_{At 8} , once close the on-off valve 3 and stop the air supply. The tank filling pressure (T ₂ ) and the initial filling tire pressure (Tp ₂ ) at this point are taken in by the sensors 5 and 6 in step S ₉ , and in step S ₁₀ , Boyle's law (PV =
P'V ', where P is the tank filling pressure, V is the tank volume, P'is the tire pressure, and V'is the tire volume), and the tire volume V'is calculated. This calculation is automatically performed by the computer of the control unit 8.

[0016] as the base to calculate the tire volume V ', in step S _11, the tire is the set pressure (Tps)
Of the filling pressure in the tank 2 (T
₃ ) is also calculated and calculated by the built-in computer (calculation of target tank internal pressure). Next, before restarting the air filling, the set pressure (Tps) and the initial filled tire pressure (Tps)
p ₂ ) are compared in step S ₁₂ . And Tps>
When it is Tp ₂ , the opening / closing valve 3 is opened in step S ₁₃ and the filling of air is restarted. During this restarting period, the filling pressure sensor 6 continues to detect (monitor) the lowered filling pressure (T ₄ ) of the tank 2 as shown in step S ₁₄ .
In step S _15, compared the reduced filling pressure and (T ₄₎ filling pressure drop point to the target and (T _3), when T _4> T ₃ is kept open the closing valve 3, air Continue filling.

On the other hand, in this comparison, when T ₄ = T ₃ , it means that the depressurization of the tank 2 has reached the target filling pressure lowering point (T ₃ ), and the tire has a predetermined set pressure. Since (Tps) has been filled, the opening / closing valve 3 is closed and the air supply is stopped in step S ₁₆ .
At the same time, in step S ₁₇ , the operator is notified of the completion of the air filling, for example, by an end alarm buzzer provided in the control section 8, and in step S ₁₈ , all the operations are completed. Further, in the comparison in step S ₁₂ , when Tps ≦ Tp ₂ , it means that the tire pressure has already reached the set pressure at the initial filling.
Immediately, the end alarm buzzer sounds and the filling work is completed.

On the other hand, in the above step S ₅ , Tps <Tp
When _one enters the exhaust system of Step S _20, the opening and closing valve 3 is opened as an exhaust valve in step S _21, the timer set time as in step S ₂₂ (for example, one second) by venting the air from the tire, the step It opened and closed at S ₂₃ valve 3
Close. The tire pressure after the air bleeding is detected by the tire pressure sensor 5 in step S ₂₄ ,
_{At 25} , the detected tire pressure (Tp ₂ ′) and set pressure (Tp ₂ ′)
ps). Here, if Tp ₂ ′ = Tps, it means that the sampling has just been performed, and in step S ₂₆ , the end alarm buzzer is sounded to notify the end,
The work ends in step S ₂₇ .

If other than Tp ₂ ′ = Tps, the difference (Tp ₂ ′ −Tps) between the set pressure and the tire pressure after extraction is calculated by the computer incorporated in the control section in step S ₂₈ , and the difference is For example, it is determined in step S ₂₉ whether it is 0.5 Kg / cm ² or more. Then, when the NO, it is determined that it is sufficient air vent about one second Atomo, returns to the step S ₂₁ parts, perform air bleeding again.
On the other hand, when the result is YES, since it is still necessary to extract the significant air opening and closing valve 3 in step S _30, in step S _31, the set time of the longer timer than the (e.g. 2 seconds) worth only performs air vent , Step S ₃₁
Immediately close the open / close valve 3 and then perform the above step S
Returning to step ₂₄ , the tire pressure after bleeding air is detected, and thereafter, the procedure returns to the same step procedure as above. This allows
Excess tire air is exhausted very quickly.

The above-mentioned steps are performed by the control unit 8
Since it is stored as a program in the storage part of, it is all done automatically. The operator simply attaches the air chuck 1 to the air injecting portion of the tire and waits for the alarm sound of the end alarm buzzer at the end of the operation. In this way
Immediately after the filling work for one tire is completed, the filling work for the next tire may be started, which is extremely efficient. Of course, it is possible to remove the cap of the air injecting part or the like in preparation for filling another tire while waiting until the alarm sounds.

As described above, since this device is portable, it suffices to hold the grip 13 and move to each tire, which is easy. The filling pressure of the tank 2 is initially 10
Since it is set to about Kg / cm ^2, it is possible to fill four tires at a time with a normal passenger car etc., and there is no need to supply air in the middle. . When this filling work is completed, the filling pressure of the tank 2 naturally lowers, but after this completion, the injection port 15 at the upper horizontal portion of the U-shaped frame 12 described above is simply replaced by the L-shaped tank stud 16. If it is placed on the air supply valve 17 of the arm 16a and suspended, the above 10
Automatic filling is carried out at a filling pressure of about Kg / cm ² to prepare for the next use.

In the above embodiment, the portable type is used, but the present invention can of course be applied to the fixed type. Further, in the present invention, Boyle's law (PV = P′V ′) is used in the calculation of the tire volume V ′, but in order to obtain higher accuracy, the air temperature in the tank (T) is used in this law. Further, if a temperature sensor for detecting the tire air temperature (T ') is also provided and the temperature is corrected as PV / T = P'V' / T ', a higher measurement accuracy can be obtained.

[0023]

As is apparent from the above description, according to the method of filling air into a tire according to the present invention, (1) in principle, the tire volume is reduced from the pressure drop of the air supply source due to the initial filling. Obtained from this, further, the filling pressure lowering point of the air supply source until reaching the set pressure of the tire is obtained, and thereafter, it is a method of filling air until it suddenly reaches the filling pressure lowering point. In addition, the filling can be performed very quickly without requiring a long time to reach the steady state or repeating the filling correction operation a plurality of times. (2) In addition, in this method, there is no risk of overfilling in principle, so there is no danger, there is no waste of air, and good economic efficiency for effective use of air is obtained. (3) Further, in this method, the air supply source such as a tank and each sensor for detecting the tire pressure are provided in a stable portion that is not adversely affected by the pipe resistance and the tire size as in a conventional mechanical meter. Since it is installed, high precision detection can be expected.

Further, according to the tire air filling device of the present invention, (1) it is portable and cordless,
Moreover, since it is compactly packed, good usability can be obtained. (2) Further, in this apparatus, since the computer is built in the control section and all the operations are programmed, the operator simply attaches the air chuck to the tire. That is, fully automatic filling is possible. (3) In addition, in this device, when a relatively large U-shaped frame is installed, the control portion is located at a high portion, is easy to see, and is separated from the high pressure portion of the tank, so that high safety is obtained. (4) Further, when the display unit of the control unit is a digital type, the visibility is good, and individual differences in work are effectively eliminated.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an entire air filling device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an embodiment of an air filling device in which the devices of FIG. 1 are assembled as a portable type.

FIG. 3 is a partial vertical cross-sectional view showing an inlet of an air supply unit in the air filling device of FIG.

FIG. 4 is a flowchart showing an air filling method according to the present invention.

5 is a flowchart showing the continuation of FIG. 4;

6 is a flowchart showing the exhaust system of FIG.

[Explanation of symbols]

 1 Air Chuck 2 Air Supply Source (Tank) 3 Open / Close Valve 5 Tire Pressure Sensor 6 Air Supply Source Filling Pressure Sensor 8 Control Section 9 Battery 10 Battery Charger 11 Leg 12 C-shaped Frame 13 Grip 15 Inlet for Air Supply Section 16 tank stand

Claims (4)

[Claims] 1. A tire air filling method for filling a tire with air at a predetermined set pressure, wherein a tire pressure of the tire is supplied from an air supply source whose volume and at least a filling pressure higher than the set pressure of the tire are known. Is lower than the set pressure, supply air to the tire, stop the supply of air when the filling pressure of the air supply source drops to a predetermined value, and detect the tire pressure, the initial filled tire pressure. ,
While the tire volume is calculated from the volume of the air supply source and the reduced filling pressure due to the air supply, the filling pressure lowering point of the air supply source until the tire pressure reaches the predetermined set pressure is calculated from the volume value. Then, thereby, the air supply from the air supply source is restarted up to the filling pressure lowering point, and the tire is filled with air at a predetermined set pressure. 2. An air chuck detachably attached to an air inlet of a tire, an air supply source having a known volume and a filling pressure higher than at least a set pressure of the tire, the air supply source and the air chuck. An opening / closing valve installed in the air supply path of the tire, a tire pressure sensor for detecting a tire pressure, a filling pressure sensor for detecting a filling pressure of the air supply source, a setting of the tire pressure, and a display unit, and Detection data from a tire pressure sensor and a filling pressure sensor are input, and a built-in computer comprises a control unit for controlling the opening / closing valve so as to fill the tire with air up to a predetermined set pressure. Air filling device. 3. The tire air filling device according to claim 2, wherein the air supply source is a portable air tank. 4. The tire air filling device according to claim 2, wherein at least the tire pressure setting and display unit of the control unit is a digital display unit.