JP2914853B2 - Tire pressure adjusting device - 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 pressure adjusting device for a vehicle tire, which adjusts the air pressure of the vehicle tire by charging or discharging air.

[0002]

2. Description of the Related Art There are systems described in U.S. Pat. Nos. 4,782,878, 4,862,938 and 5,141,589 which change the air pressure according to the situation of a vehicle. The devices described in these publications are designed to control the tire pressure to a set value.If the tire pressure is lower than the set value, the inflation valve is opened for a certain period of time, and the tire pressure becomes higher than the set value. If it is high, the deflation valve is controlled to open for a certain period of time. Then, by repeatedly performing such control, the tire pressure is controlled to a set value.

[0003]

However, in the above-mentioned publication, the inflation valve or the deflation valve is opened at a constant opening for a predetermined time regardless of the pressure difference between the tire and the set value. ,
In particular, when the pressure difference is large, there is a problem that the number of valve operations increases and it takes time before the tire pressure approaches the set value. Therefore, the object of the present invention is to
An object of the present invention is to provide a tire pressure adjusting device capable of reducing the number of valve operations required until the tire pressure reaches a set value and shortening the time required to complete the air pressure adjustment.

[0004]

In order to achieve the above object, a tire pressure adjusting device according to claim 1 of the present invention comprises:
An air pressure source for supplying compressed air, connection means for opening the tire valve when connected to the tire valve, input means for inputting a set value of the tire air pressure, and air pressure measuring means for measuring the air pressure of the tire And a charge valve for switching the connection and disconnection between the connection means and the air pressure source, a discharge valve for switching the connection and disconnection between the connection means and the atmosphere, and a valve operation amount of the charge valve and the discharge valve. of
A valve drive unit for controlling each valve opening, and a valve opening as a valve operation amount corresponding to a pressure difference between a set value input by the input unit and a tire pressure measured by the air pressure measuring unit are stored. A valve opening as a valve operation amount corresponding to a pressure difference between a set value set by the input unit and a tire air pressure measured by the air pressure measuring unit, and reads the valve opening degree from the storage unit. And control means for controlling the valve drive means with an opening degree .

The tire pressure adjusting device according to a second aspect of the present invention uses the valve opening time in addition to the valve opening amount as the valve operation amount in addition to the first aspect, and the storage means stores The control means stores a valve opening degree and a valve opening time according to the pressure difference, and the control means responds to a pressure difference between a set value set by the input means and an air pressure of the tire measured by the air pressure measuring means. Air pressure adjusting means for reading the valve opening degree and the valve opening time from the storage means, controlling the valve driving means to open and control the charging valve or the discharge valve at the valve opening degree for the valve opening time, After the control of the air pressure adjusting means is completed, the pressure difference calculating means for calculating the pressure difference between the tire air pressure and the set value, and the control is ended when the pressure difference by the pressure difference calculating means falls within a predetermined range. It is characterized by comprising a termination means that.

According to a third aspect of the present invention, in addition to the first aspect, the tire pressure adjusting device uses a valve opening time in addition to a valve opening degree as the valve operation amount. The control means stores a valve opening degree and a valve opening time according to the pressure difference, and the control means responds to a pressure difference between a set value set by the input means and an air pressure of the tire measured by the air pressure measuring means. The first air pressure adjustment which reads the valve opening degree and the valve opening time from the storage means and controls the valve driving means to open and control the charging valve or the discharge valve at the valve opening degree for the valve opening time. Means, a change rate calculating means for calculating a pressure change rate of the tire air pressure at the time of control by the first air pressure adjusting means, and a holding means for storing the valve opening and the pressure change rate, A first pressure difference calculating means for calculating a pressure difference between the tire air pressure and the set value after the control of the first air pressure adjusting means, and a pressure difference by the first pressure difference calculating means, A second air pressure adjusting means for controlling the charging valve or the discharging valve based on the valve opening time and the valve opening stored in the holding means, by dividing by A second pressure difference calculating means for calculating a pressure difference between the tire air pressure and the set value after the control of the second air pressure adjusting means, and a first pressure difference calculating means and a second pressure difference calculating means. And a terminating means for terminating the control when any of the pressure differences falls within a predetermined range.

According to a fourth aspect of the present invention, in addition to the second or third aspect, the valve opening stored in the storage means is a constant opening.
The valve opening time is set to be longer when the pressure difference is large.

According to a fifth aspect of the present invention, in addition to the second aspect, the valve opening time stored in the storage means is constant, and the valve opening degree is the pressure difference. Is set to be large when the value is large.

According to a sixth aspect of the present invention, there is provided a tire pressure adjusting device according to any one of the first to fifth aspects, further comprising a display for displaying a set value input from the input means and the pressure difference. It is characterized by comprising means.

According to a seventh aspect of the present invention, in addition to the tire pressure adjusting apparatus according to the sixth aspect, the display means includes a digital display section for displaying the set value, and a column for displaying the pressure difference. The control means is configured to illuminate left and right with a center of the plurality of display elements as a boundary in accordance with the pressure difference calculated by the pressure difference calculation means. It is characterized in that control is performed so that the light is blinked in opposite directions when the air valve is opened and when the air discharge valve is opened.

[0011]

According to the tire pressure adjusting device of the first aspect of the present invention, the set value of the air pressure is externally input by the input means, and the air pressure measuring means measures the actual air pressure of the tire. Then, the control means calculates a pressure difference between the actual tire pressure measured by the air pressure measurement means and the set value, and in accordance with the pressure difference, a valve opening as a valve operation amount of the charge valve or the discharge valve. The degree is read from the storage means, and the valve driving means is controlled by the valve opening degree as the valve operation amount. Therefore, in order to control the valve opening as a valve operation amount in accordance with the pressure difference, the tire pressure is set to a set value compared to a method in which the valve is opened at a constant opening and for a fixed time regardless of the pressure difference. Can be shortened.

According to the tire pressure adjusting device of the second aspect of the present invention, the set value of the air pressure is externally input by the input means, and the actual pressure of the tire is measured by the air pressure measuring means. Then, the air pressure adjusting means of the control means calculates the pressure difference between the actual tire pressure measured by the air pressure measuring means and the set value, and according to this pressure difference, the valve opening of the charge valve or the discharge valve And the valve opening time is read from the storage means, and the valve driving means is controlled to open and control the charge valve or the discharge valve by the valve opening degree for the valve opening time. Then, the pressure difference calculating means calculates the pressure difference between the tire air pressure and the set value after the control of the air pressure adjusting means, and the ending means performs control when the pressure difference by the pressure difference calculating means falls within a predetermined range. Will be terminated. Therefore, in order to control the valve opening and the valve opening time according to the pressure difference, the time required for the tire pressure to approach the set value is shorter than that in which the valve is controlled to be opened for a fixed time regardless of the pressure difference. Can be shortened.

According to the tire pressure adjusting device of the third aspect of the present invention, when the set value of the air pressure is externally inputted by the input means, the air pressure measuring means measures the actual air pressure of the tire, and the first means of the control means. Air pressure adjusting means calculates a pressure difference between the actual air pressure of the tire measured by the air pressure measuring means and the set value, and calculates a valve opening degree and a valve opening time of a charge valve or a discharge valve according to the pressure difference. Reading from the storage means, the valve driving means is controlled to open and control the charge valve or the discharge valve for the valve opening time at the valve opening degree. Here, the change rate calculating means calculates the pressure change rate of the tire air pressure at the time of control by the first air pressure adjusting means, and stores the pressure change rate and the valve opening degree in the holding means. Then, the first pressure difference calculating means calculates the pressure difference between the tire air pressure and the set value after the control of the first air pressure adjusting means, and the second air pressure adjusting means holds the pressure difference, The charge valve or the discharge valve is controlled based on the valve opening time obtained by dividing by the pressure change rate stored in the storage unit and the valve opening degree stored in the holding unit. Then, the second pressure difference calculating means calculates the pressure difference between the tire air pressure and the set value after the control of the second air pressure adjusting means, and the ending means includes the first pressure difference calculating means and the second pressure difference calculating means. When the pressure difference by any one of the pressure difference calculation means falls within a predetermined range, the control is terminated. Therefore, in order to control the valve opening and the valve opening time according to the pressure difference, the time required for the tire pressure to approach the set value is shorter than that in which the valve is controlled to be opened for a fixed time regardless of the pressure difference. Can be shortened. In addition, the actual pressure change rate (depending on the type of tire) of the tire, which is determined in the charging or discharging process by the first air pressure adjusting means, is used to open the next charging or discharging valve. Since the time is set, the time required for adjusting the air pressure to the set value is further reduced.

According to the tire pressure adjusting device of the fourth aspect of the present invention, in addition to the second or third aspect, the valve opening stored in the storage means is a constant opening. The opening time is set to be longer when the pressure difference is large, so that only the valve opening time needs to be controlled.

According to a fifth aspect of the present invention, in addition to the second aspect, the valve opening time stored in the storage means is constant and the valve opening degree is equal to the pressure. Since the difference is set to be large when the difference is large, it is only necessary to control only the valve opening.

According to the tire pressure adjusting device of the sixth aspect of the present invention, in addition to the one of the first to fifth aspects, the display means includes a set value and a pressure input from the input means. Since the differences are displayed, the operator can recognize them.

According to a seventh aspect of the present invention, in addition to the above-mentioned sixth aspect, the control means includes a plurality of display means for displaying a plurality of displays in accordance with the pressure difference calculated by the pressure difference calculating means. Lighting left and right with the center of the element as a boundary, control is performed so that when the charge valve is open and when the discharge valve is open, it blinks in the opposite direction to each other. Therefore, it is possible to make the operator recognize that there is a pressure difference and that air release or air supply is being performed accordingly.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tire pressure adjusting device according to a first embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the tire pressure adjusting device of the present embodiment includes a tire pressure adjusting head 1 and an air pressure source 2 for supplying compressed air. 2 is connected via a connection coupler 4 to a distal end of an air pressure source side hose 3 connected to the hose 2. Tire pressure adjusting head 1
Is a pneumatic pressure adjustment unit 5 provided with one connection nipple 4a of the connection coupler 4, a connection side hose 6 made of high pressure rubber having one end connected to the opposite side to the connection nipple 4a of the air pressure adjustment unit 5, and It has a tire valve connection portion 7 as connection means attached to the other end of the connection side hose 6 so as to be located near the air pressure adjustment unit 5. Here, the tire valve connection portion 7 is normally open, and is connected to a normally closed tire valve 9 provided on the tire 8 by an operator, thereby opening the tire valve 9 and opening the tire 8. The inside and the inside of the air pressure adjusting unit 5 are brought into communication with each other. The connection nipple 4a is attached to an end of an air introduction pipe 6a connected to a side of the air pressure adjusting unit 5.

The air pressure adjusting unit 5 includes a set value input unit 11 serving as input means, which has a setting button 10 for digitally inputting an air pressure set value or the like externally, facing the surface of the air pressure adjusting unit 5; The display window 12 provided with digital display bodies 12a and 12b for digitally displaying the set value of the tire 8 and the measured value of the air pressure of the tire 8 or the pressure difference between the measured value and the set value (described later) faces the surface. And a display unit 13. In the air pressure adjusting unit 5, a passage 14 for connecting the connection side hose 6 and the air pressure source side hose 3 is provided. In the passage 14, the air pressure in the passage 14 is measured so that the tire 8 A pressure sensor 15 is provided as air pressure measuring means for measuring the actual air pressure. A branch passage 16 branching from the passage 14 and communicating with the atmosphere is connected to the passage 14 from the mounting position of the pressure sensor 15 to the air pressure source 2, and is connected to the air pressure source 2 from the branch point of the branch passage 16. Passage 1
4 is provided with a charge valve 17 whose opening degree can be controlled. Further, the branch passage 16 is provided with an air release valve 18 whose opening can be controlled.

The charging valve 17 and the discharging valve 18
Is a valve driving unit that drives the charge valve 17 or the discharge valve 18 by a control signal A from a control unit 19, which is a control unit described later, and adjusts the opening / closing operation and the opening degree thereof. The valve drive unit 20 is connected.
Note that the valve drive unit 20 and the control unit 19 are connected to the control device 21.
Is composed. The control unit 19 includes, for example, a microprocessor.
Set value input unit 11, display unit 13, valve drive unit 20, pressure sensor 15, buzzer 22, RAM 24 and ROM 2
5 is connected. Setting value input unit 11, display unit 13,
Valve drive unit 20, control unit 19, RAM 24 and RO
A battery 23 for supplying power to these components is connected to M25.
A power switch (not shown) for switching F is connected.

In the ROM 25, there are shown FIGS.
0 is stored, and the absolute value of the pressure difference ΔP between the set value and the measured value of the air pressure of the vehicle tire pressure adjusting device shown in FIG. A graph showing an example of the relationship,
As shown in FIG. 14, a graph showing an example of the relationship between the absolute value of the pressure difference ΔP between the set value and the measured value of the air pressure of the vehicle tire pressure adjusting device and the valve opening time at the time of the initial setting is stored as map data. ing.

According to the flow charts shown in FIGS. 4 to 10, the control contents of the control unit 19 will be mainly described step by step. In the following flowchart, it is assumed that the tire pressure adjusting head 1 is already connected to the air pressure source 2 and the power switch is turned on. [Step S1] First, at the start of the air pressure adjustment work of the tire 8, the mode setting, that is, the basic operation is set by inputting the setting button 10 of the set value input unit 11. The contents are as follows: the unit of the air pressure, the tire order pattern for adjusting the air pressure (F: front and R: rear, F → F → R → R, F → R → R → F, R → R →
F → F, R → F → F → R, and selection during adjustment), the setting of how many minutes elapse in the atmospheric pressure state in step S14 described below, and the pressure difference ΔP described later. For example, the allowable range E is set at the time of the determination.
This setting is stored even if the power switch is turned off, and the operation can be started with the same setting at the next ON.

[Step S2] Whether or not the set values of the air pressures of the front and rear wheels are the same is externally input by the set value input unit 11. If the front and rear wheels are the same, the process proceeds to [Step S3]. If the front and rear wheels are not the same, [Step S3]
6]. [Step S3] When the operator presses the setting button 10 to input a set value of the air pressure of the same tire 8 before and after, a digital signal corresponding to the set value is input from the set value input unit 11. Here, the operator connects the tire valve connection part 7 to the tire valve 9 after the input of the set value is completed. [Step S4] The digital signal of the set value is received and output to the display unit 13, and the set value is digitally displayed on the display window 12 of the display unit 13.

[Step S5] Upon receipt of the digital signal, the set value is written to the RAM 24. [Step S6] When the operator presses the setting button 10 to input the set value of the air pressure of the tire 8 on the front wheel side, a digital signal corresponding to the set value is input from the set value input unit 11. [Step S7] The digital signal of the front wheel set value is received and output to the display unit 13, and the front window set value is digitally displayed on the display window 12 of the display unit 13. [Step S8] In response to the digital signal, the front wheel set value is written into the RAM 24.

[Step S9] The operator presses the set button 10
When the set value of the air pressure of the tire 8 on the rear wheel side is input by pressing, a digital signal corresponding to the set value is input from the set value input unit 11. Here, the operator connects the tire valve connection part 7 to the tire valve 9 after the input of the set value is completed. [Step S10] The digital signal of the rear wheel set value is received and output to the display unit 13, and the rear wheel set value is digitally displayed on the display window 12 of the display unit 13. [Step S11] Upon receiving the digital signal, the rear wheel set value is written into the RAM 24.

[Step S12] A signal indicating the tire (front wheel or rear wheel) 8 to be measured and a digital signal of the tire pressure set value are output to the display unit to display the measured tire and its set pressure value. This is [Step S
This displays tires and the like to be adjusted according to the order pattern of the tires 8 to be adjusted set in 1). [Step S13] It is determined whether or not the set value is the atmospheric pressure. If the set value is the atmospheric pressure, the process proceeds to [Step S14]; otherwise, the process proceeds to [Step S15]. [Step S14] In accordance with the setting in the above [Step S1], it is determined whether or not a predetermined time has elapsed during the atmospheric pressure state. If it has elapsed, the air pressure adjustment work is terminated; otherwise, the process returns to the above-mentioned [Step S13], and between the [Step S13] and [Step S14] until the atmospheric pressure state elapses a predetermined time. Loop.

[Step S15] A predetermined waiting time until the measurement signal from the pressure sensor 15 is stabilized is counted.
That is, if the air pressure is measured immediately after the pressure increase processing in [Step S21] or the pressure reduction processing in [Step S22] described later is performed, the air pressure may not be stable. This is a process performed for the purpose of canceling the measurement up to. [Step S16] The measurement signal from the pressure sensor 15 is input and the actual air pressure of the tire 8 is measured and calculated. [Step S17] Actual measured value P of air pressure of tire 8
The pressure difference ΔP between _m and the set value _Ppr is calculated according to the following equation. ΔP = P _m −P _pr

[Step S18] A digital signal corresponding to the calculation result ΔP is output to the display unit 13, and the value of the pressure difference ΔP is digitally displayed along with the set value. That is, the set value is displayed on the digital display 12a, and the pressure difference ΔP is displayed on the digital display 12b. [Step S19] The value of the pressure difference ΔP is determined. That is, if ΔP falls within the allowable range E set in [Step S1], it is determined that ΔP is substantially equal to 0 [Step S20].
If it is not within the permissible range E and ΔP <0, the flow proceeds to the pressure increasing process of [Step S21]. Further, if it is not within the permissible range E and ΔP> 0, [ The process proceeds to step S22]. [Step S20] A drive signal is output to the buzzer 22 and the buzzer 22 is sounded to notify the worker of the end of the adjustment, and the process returns to [Step S12].

[Step S21] After the pressure increasing process is performed according to the flowcharts (described later) shown in FIGS. 7 and 8, the process returns to [Step S13]. [Step S22] After the decompression process is performed according to the flowcharts (described later) shown in FIGS. 9 and 10, the process returns to [Step S13].

Next, the pressure increasing process performed in [Step S21] will be described with reference to flowcharts shown in FIGS. 7 and 8, a pressure characteristic diagram shown in FIG. 11, and the like. [Step S21-1] It is determined whether or not the pressure increasing operation is the first time.
21-2], otherwise [Step S2].
1-14]. [Step S21-2] are written in advance in the ROM 25, reads the valve position F _OA and the valve open time F _OT corresponding to the value of the pressure difference [Delta] P. Here, the ROM 25
The relationship between the pressure difference ΔP, which is set and stored in advance, and the valve opening degree and valve opening time of the charge valve 17 is, for example, as shown in the graphs of FIGS. That is, when the absolute value of ΔP is large, the valve opening is increased and the valve opening time is lengthened. Conversely, when the absolute value of ΔP is small, the valve opening is reduced and the valve opening time is shortened. The relationship between ΔP and the valve opening is set to be proportional, and the relationship between ΔP and the valve opening time is set to be proportional.

[0031] and outputs a control signal corresponding to [Step S21-3] read valve position F _OA to the valve drive unit 20. The valve drive unit 20 transmits a drive signal for controlling the valve opening in accordance with the control signal to the charge valve 1.
7 to open the charging valve 17 to an opening corresponding to the value of the pressure difference ΔP. [Step S21-4] The valve opening time F _OT according to the pressure difference ΔP is measured. [Step S21-5] The output of the control signal is stopped, the output of the drive signal from the valve drive unit 20 is stopped, and the charge valve 17 is closed. As described above, air is introduced into the tire 8 from the air pressure source 2 as shown by A in FIG.

[Step S21-6] A predetermined waiting time until the measurement signal from the pressure sensor 15 is stabilized is counted. That is, this is a process performed for the purpose of canceling the measurement until the air pressure is stabilized because the air pressure may not be stable if the air pressure is measured immediately (FIG. 11).
B). [Step S21-7] The measurement signal from the pressure sensor 15 is input and the actual air pressure of the tire 8 is measured and calculated. [Step S21-8] It is determined whether or not the current measured value of the air pressure is larger than the previous measured value. If it is larger, it means that the adjustment has been performed well [Step S2
1-9], otherwise the adjustment is not correct and the process proceeds to [Step S21-12].

[0033] [Step S21-9] pressure change rate a _(FOA) and the current measurement value when the valve opening F _OA and the pressure difference ΔP between the setting value calculated according to the following equation. a _(FOA) = (current measured value−previous measured value) / valve opening time F _OT ΔP = current measured value−set value [Step S21-10] Pressure change rate a _(FOA) and valve opening F _OA Is written to the RAM 24. [Step S21-11] The pressure difference ΔP is determined. That is, if ΔP falls within the allowable range E set in [Step S1], it is determined that ΔP is substantially equal to 0, and the pressure increasing process is terminated. If ΔP <0 is not within the allowable range E and Proceed to [Step S21-1]. [Step S21-12] It is considered that there is an air supply error, and an error signal is output to the display unit 13 to display an error.

[Step S21-13] The operator confirms the error display. [Step S21-14] [Step S21-
In [1], when it is determined that the pressure increasing operation is not the first time, in this step [Step S21-10]
In reading the written rate of pressure change a _(FOA) and valve opening F _OA in RAM 24. The [Step S21-15] pressure change rate a _(FOA) and the pressure difference ΔP valve open time F _T computed according to the following equation. F _T = ΔP / a _(FOA)

[0035] and outputs a control signal corresponding to [Step S21-16] read valve position F _OA to the valve drive unit 20. Then, the valve drive section 20 outputs a drive signal for controlling the valve opening in accordance with the control signal to the air-charging valve 17, and causes the air-charging valve 17 to have the same opening F _OA as the previous time.
To open. [Step S21-17] for measuring the valve opening time F _T calculated in [Step S21-15]. Fig. 1
In step 1, a line C is assumed to assume that the set value has been reached as it is at the same gradient as the gradient of A (pressure change rate), and this C is shifted to the right as it is by the waiting time B for stabilizing the measured value. The air is charged according to the line. In addition, E shown in FIG. 11 is a waiting time for the measurement value stabilization initially performed in [Step S15].

Next, the decompression process performed in [Step S22] will be described with reference to the flowcharts shown in FIGS. [Step S22-1] It is determined whether or not the pressure reducing operation is the first time.
22-2], otherwise [Step S2
2-14]. [Step S22-2] The valve opening degree R _OA and the valve opening time R _OT corresponding to the value of the pressure difference ΔP, which are written in the ROM 25 in advance, are read. Here, the ROM 25
The relationship between the pressure difference ΔP set and stored in advance and the valve opening degree and the valve opening time of the discharge valve 18 is, for example, as shown in the graphs of FIGS. That is, when the absolute value of ΔP is large, the valve opening is increased and the valve opening time is lengthened. Conversely, when the absolute value of ΔP is small, the valve opening is reduced and the valve opening time is shortened. The relationship between ΔP and the valve opening is set to be proportional, and the relationship between ΔP and the valve opening time is set to be proportional.

[Step S22-3] A control signal corresponding to the read valve opening degree R _OA is output to the valve drive section 20. The valve drive unit 20 transmits a drive signal for controlling the valve opening in accordance with the control signal to the air release valve 1.
8 to open the air release valve 18 to an opening corresponding to the value of the pressure difference ΔP. [Step S22-4] The valve opening time R _OT according to the pressure difference ΔP is measured. [Step S22-5] The output of the control signal is stopped, the output of the drive signal from the valve drive unit 20 is stopped, and the discharge valve 18 is closed. As described above, the air is released from the inside of the tire 8 to the atmosphere. [Step S22-6] A predetermined waiting time is measured until the measurement signal from the pressure sensor 15 is stabilized. That is, this is a process performed for the purpose of canceling the measurement until the air pressure becomes stable because the air pressure may not be stable if the air pressure is measured immediately.

[Step S22-7] The measurement signal from the pressure sensor 15 is input and the actual air pressure of the tire 8 is measured and calculated. [Step S22-8] It is determined whether or not the current measured value of the air pressure is smaller than the previous measured value. If it is smaller, it means that the adjustment has been performed well [Step S2
2-9], otherwise the adjustment is not correct and the process proceeds to [Step S22-12]. [Step S22-9] Pressure change rate a _{(ROA) at the} valve opening R _OA and the pressure difference Δ between the current measured value and the set value
P is calculated according to the following equation. a _(ROA) = (current measured value-previous measured value) / valve open time R _OT ΔP = current measured value-set value

[Step S22-10] Pressure change rate a
_(ROA) and writes the valve opening R _OA in RAM 24. [Step S22-11] The pressure difference ΔP is determined. That is, if ΔP falls within the allowable range E set in [Step S1], it is determined that ΔP is substantially equal to 0, and the pressure reduction process is terminated. If ΔP is not within the allowable range E and ΔP> 0, then [ Proceed to step S22-1]. [Step S22-12] It is considered that there is an outgassing error, and an error signal is output to the display unit to display an error. [Step S22-13] The operator confirms the error display.

[Step S22-14] If it is determined in step S22-1 that the pressure-reducing operation is not the first time, the process proceeds to step S22-14.
22-10], the pressure change rate a written in the RAM 24
_(ROA) and reads the valve position R _OA. [Step S22-15] The valve opening time _RT is calculated from the pressure change rate a _(ROA) and the pressure difference ΔP according to the following equation. R _T = ΔP / a _(ROA) [Step S22-16] A control signal corresponding to the read valve opening degree R _OA is output to the valve drive unit 20. Then, the valve drive section 20 outputs a drive signal for controlling the valve opening in accordance with the control signal to the air release valve 18, to open the dissipating gas valve 18 to the same degree R _OA as before.

[Step S22-17] [Step S2
The valve open time _RT calculated in 2-15] is measured.
Here, the flow of control performed according to the flowcharts shown in FIGS. 4 to 10 is as follows. That is, when the set value of the air pressure is externally input by the set value input unit 11, the pressure sensor 15 measures the actual air pressure of the tire,
The control unit 19 calculates a pressure difference between the actual air pressure of the tire 8 measured by the pressure sensor 15 and the set value, and according to the pressure difference, the opening degree and the opening time of the charge valve 17 or the discharge valve 18. Valve drive 20 to control the
Output a control signal to perform charging or discharging. And
Next, from the measured value to be measured, the pressure change rate of the charging or discharging with respect to the opening time is calculated, and the pressure difference between the set value and the next measured value is calculated, and the charging valve 17 or the discharging valve is calculated. The opening degree of 18 is the same as the previous time, and charging or discharging is performed only for the valve opening time calculated from the pressure difference and the pressure change rate.

Therefore, using the actual pressure change rate of the tire 8 (depending on the type of the tire 8) revealed in the charging or discharging process, the valve opening time of the next charging or discharging is determined. Since the setting is performed, the number of valve operations until the air pressure is adjusted to the set value can be reduced, and the time until the end of the adjustment can be shortened. If the tire 8 whose air pressure has been adjusted last time is the same as the tire 8 to be adjusted next time, the control unit 19
However, after the previous adjustment of the tire 8 is completed [Step S12]
When the pressure increasing process is performed in [Step S21], the process is started from [Step S21-14], or when the depressurizing process is performed in [Step S22], the process is performed in [Step S21].
22-14], the pressure between the set value of the air pressure input to the set value input unit 11 and the measured value of the actual air pressure of the tire 8 for the next and subsequent adjustments measured by the pressure sensor 15 Calculate the difference and fill
7 or the opening of the discharge valve 18 is set to the same as the previous time,
As shown in FIG. 12, air is charged or discharged only for the opening time Δt ₁ determined from the pressure difference ΔP and the actual pressure change rate of the tire 8 previously adjusted (the gradient of the F portion shown in FIG. 12). Will be. As a result, the previously adjusted tire 8
Since the actual valve pressure change rate of the tire 8 clarified in the charging or discharging process of the tire 8 is used to set the valve opening time of the charging or discharging of the next tire 8, At the time of tire adjustment, the number of valve operations until the air pressure is adjusted to the set value is further reduced, and the time until the end of the adjustment is further reduced.

In the first embodiment, the operator does not need to adjust the air charge and the air discharge, and the air pressure is automatically adjusted only by inputting the set value. Thus, workability is improved. Moreover, since the air pressure adjusting unit 5 is connected to the vicinity of the tire valve connection part 7, the operator can perform all operations such as inputting set values at hand, and move to a specific place for pressure setting. This makes it possible to easily and immediately change the air pressure setting. Furthermore, since the set value can be displayed on the display unit 13, the operator can visually check the set value and prevent erroneous setting. In addition, since the value of the pressure difference ΔP between the set value and the measured value can be displayed on the digital display 12b side by side with the set value at each measurement, it is necessary to confirm that the air pressure is adjusted due to the pressure difference. Can be easily recognized. Further, since the buzzer 22 sounds at the end of the adjustment, the operator can easily know the end of the adjustment.

In the first embodiment, the tire valve connecting portion 7 is normally open, but may be normally closed. Also, ROM
The relationship between the absolute value of the pressure difference ΔP and the valve opening degree and the valve opening time of the charge valve 17 or the discharge valve 18 stored in advance in the storage 25 can be changed as necessary without being limited to the above. For example, ON-OFF (open
When an inexpensive valve that can only be controlled (closed) is adopted, the relationship shown in FIG. 34 and FIGS. 35 to 39 may be used. The control in the case where the ON-OFF valve is employed for the charging valve 17 or the discharging valve 18 will be described later. The relationship shown in FIG. 34 and FIGS. 35 to 39 can of course be applied to the first embodiment in which both the valve opening and the valve opening time are controlled to be changed.

Next, a second embodiment of the present invention will be described with reference to FIGS. In this second embodiment, as shown in FIG. 16, a display window 12 has a digital display body 12a for displaying a set value of air pressure, and a plurality of light emitting elements 12c, such as LEDs, arranged in a row below the digital display body 12a. Is provided. Here, in the second embodiment, the right direction is set to the + direction and the left direction is set to the-direction when viewed from the worker side, with reference to the central one of the plurality of light emitting elements 12c. Then, the light emitting element 12c is turned on according to the magnitude of the pressure difference ΔP between the set value of the air pressure and the measured value. In this case, only one light may be turned on as shown in FIG. 17, or a plurality of light emitting elements 12c may be turned on as shown in FIG. In the second embodiment, the pressure difference ΔP
Is displayed, and the light-emitting element 12c is blinked to indicate that the pressure increasing or depressurizing process is being performed, so that the operator can easily recognize the fact. Therefore, the control content of the control unit 19 is the same as that of the first embodiment except for the display, and different portions will be described below.

FIG. 19 is a flowchart for performing the pressure increasing process corresponding to FIG. 7 of the first embodiment. The processing of [Step S21-4] in FIG.
In [a], the process of [Step S21-17] is changed to the following process of [Step S21-17a]. [Step S21-4a] The valve opening time F _OT according to the pressure difference ΔP is measured. Further, the fact that the pressure increasing process is being performed is indicated by blinking the light emitting element 12c in the + direction. Here, FIGS. 23A to 23E illustrate the light emitting element 12c as a light emitting element.
In this example, the light is blinked in the positive direction. On the contrary, the light is blinked in the positive direction. Note that in FIGS. 23A to 23E, the center light emitting element is always lit to indicate that it is the center. In addition, in the figure, those with dots on the upper and lower sides are in the lighting state.

[Step S21-17a] [Step S
Clocking the computed valve opening time F _T at 21-15]. Further, the fact that the pressure increasing process is being performed is indicated by the light emitting element 1.
2c is indicated by blinking in the + direction. FIG. 20 is a flowchart for performing the pressure increasing process corresponding to FIG. 8 of the first embodiment.
The process of [Step S21-9] in FIG. 8 is changed to the following [Step S21-9a]. [Step S21-9a] pressure change rate a _(FOA) and the current measurement value when the valve opening F _OA and the pressure difference ΔP between the setting value calculated according to the following equation. a _(FOA) = (current measured value−previous measured value) / valve opening time F _OT ΔP = current measured value−set value ΔP is displayed in the − direction together with the lack of pressure by the light emitting element 12c. Let it. Here, FIG. 17 or FIG.
Is an example in which the pressure difference ΔP is illuminated and displayed in the + direction to indicate that the pressure is excessive, but the display is blinked in the − direction.

FIG. 21 is a flow chart for performing a decompression process corresponding to FIG. 9 of the first embodiment. The processing of [Step S22-4] in FIG.
In [a], the process of [Step S22-17] is changed to the following process of [Step S22-17a]. [Step S22-4a] The valve opening time R _OT according to the pressure difference ΔP is measured. Further, the fact that the decompression process is being performed is indicated by blinking the light emitting element 12c in the negative direction. That is, as shown in FIGS.
2c blinks in the negative direction. [Step S22-17a] [Step S22-15]
The valve opening time _RT calculated by the above is measured. Further, the fact that the decompression process is being performed is indicated by blinking the light emitting element 12c in the negative direction.

FIG. 22 is a flowchart for performing the decompression process corresponding to FIG. 10 of the first embodiment. The processing of [Step S22-9] in FIG.
-9a]. [Step S22-9a] The pressure change rate a _{(ROA) at the} valve opening R _OA and the pressure difference ΔP between the current measured value and the set value are calculated according to the following equations. a _(ROA) = (current measured value−previous measured value) / valve opening time R _OT ΔP = current measured value−set value ΔP is displayed in the positive direction along with the excess pressure in the light emitting element 12c. . That is, the pressure difference ΔP is lit and displayed as shown in FIG. 17 or FIG. Note that the blinking of the light emitting element 12c performed while measuring the valve opening time is indicated in FIG.
(A) to FIG. 24 (J). Note that FIGS. 24A to 24J show the pressure reduction process.

Next, a third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the control contents of the control unit 19 are the contents shown in the flowcharts of FIGS. 25 to 28 in contrast to FIGS. 4 to 10 of the first embodiment. [Step S31] First, at the start of the air pressure adjustment work of the tire 8, the mode setting, that is, the basic operation is set by inputting the setting button 10 of the set value input unit 11. The contents are expressed in units of air pressure, [Step S3
In [6], the setting is made as to how many minutes have elapsed in the atmospheric pressure state before the end is determined, and the allowable range E at the time of the pressure difference ΔP determination described later is set. This setting is stored even if the power switch is turned off, and the operation can be started with the same setting at the next ON. [Step S32] When the operator presses the setting button 10 to input a set value of the air pressure of the tire 8, a digital signal corresponding to the set value is input from the set value input unit 11. Here, the operator connects the tire valve connection part 7 to the tire valve 9 after the input of the set value is completed. If the tire to be adjusted next has a change in the set value of the air pressure, the adjustment work is started from this step before the tire valve connecting section 7 is connected to the tire valve 9.

[Step S33] Upon receipt of the digital signal, the set value is written into the RAM 24. [Step S34] The digital signal of the set value is displayed on the display unit 13.
And the set value is digitally displayed on the digital display 12a of the display window 12 of the display unit 13. [Step S35] It is determined whether or not the set value is the atmospheric pressure. If the set value is the atmospheric pressure, the process proceeds to the next [Step S36]; otherwise, the process proceeds to the later-described [Step S37]. If there is no change in the set value of the air pressure of the tire to be adjusted next, the adjustment work is started from this step after the tire valve connecting portion 7 is connected to the tire valve 9.

[Step S36] The above [Step S3
In accordance with the setting in [1], it is determined whether or not the time during which the atmospheric pressure is maintained has passed a predetermined time. If it has elapsed, the air pressure adjustment work is terminated; otherwise, the process returns to [Step S35], and the steps [Step S35] and [Step S3] until the atmospheric pressure state elapses a predetermined time.
6]. [Step S37] A predetermined waiting time until the measurement signal from the pressure sensor 15 is stabilized is counted. That is, if the air pressure is measured immediately after the pressure increasing process of [Step S33] or the pressure reducing process of [Step S34] described later is performed, the air pressure may not be stable. This is a process performed for the purpose of canceling the measurement up to. [Step S38] The measurement signal from the pressure sensor 15 is input and the actual air pressure of the tire 8 is measured and calculated.

[0053] [Step S39] and the measured value P _m of the air pressure of the actual tire 8 a pressure difference ΔP between the set value P _pr is calculated according to the following equation. ΔP = P _m −P _pr [Step S40] A digital signal corresponding to the calculation result ΔP is output to the display unit 13, and the value of ΔP is displayed along with the set value on the digital display 12b. [Step S41] The value of the pressure difference ΔP is determined. That is, if ΔP falls within the allowable range E set in [Step S31], it is determined that approximately ΔP = 0 and [Step S4].
2], if it is not within the allowable range and ΔP <0, the process proceeds to the pressure increasing process of [Step S43]. If it is not within the allowable range and ΔP> 0, [ The process proceeds to step S44]. [Step S42] A drive signal is output to the buzzer 22 to sound the buzzer 22.

[Step S43] After the pressure increasing process is performed according to the flowchart (described later) shown in FIG. 27, the process returns to [Step S37]. [Step S44] After performing the decompression process according to the flowchart (described later) shown in FIG. 28 [Step S3
7]. [Step S45] It is determined whether or not the set value of the air pressure of the tire 8 has been changed based on the input state to the set value input unit 11. If there is a change, the process returns to [Step S32]; otherwise, the process returns to [Step S35].

Next, the pressure increasing process performed in [Step S43] will be described with reference to the flowchart shown in FIG. [Step S43-1] The valve opening degree and the valve opening time of the charge valve 17 corresponding to the value of the pressure difference ΔP, which are written in the ROM 25 in advance, are read. [Step S43-2] A control signal corresponding to the read valve opening is output to the valve drive unit 20. Then, the valve drive section 20 outputs a drive signal for controlling the valve opening in accordance with the control signal to the charging valve 17 to open the charging valve 17 to an opening corresponding to the value of the pressure difference ΔP. [Step S43-3] The valve opening time according to the pressure difference ΔP is measured.

[Step S43-4] The output of the control signal is stopped, the output of the drive signal from the valve drive unit 20 is stopped, and the charge valve 17 is closed. From the above,
Tire 8 with flow rate corresponding to valve opening and valve opening time
Air is introduced from the air pressure source 2 into the inside. ROM2
The relationship between the pressure difference ΔP preset and stored in FIG. 5 and the valve opening degree and valve opening time of the charging valve 17 is as follows.
For example, it is as shown in the graphs of FIG. 29 and FIG. That is, when the absolute value of ΔP is large, the valve opening is increased and the valve opening time is lengthened. Conversely, ΔP
Is small, the valve opening is reduced and the valve opening time is shortened. The relationship between ΔP and the valve opening is set to be proportional, and the relationship between ΔP and the valve opening time is set to be proportional.

Next, the decompression process performed in [Step S44] will be described with reference to the flowchart shown in FIG. [Step S44-1] The valve opening degree and the valve opening time of the air release valve 18 corresponding to the value of the pressure difference ΔP, which are written in the ROM 25 in advance, are read. [Step S44-2] A control signal corresponding to the read valve opening is output to the valve drive unit 20. Then, the valve drive section 20 outputs a drive signal for controlling the valve opening in accordance with the control signal to the air release valve 18 to open the air release valve 18 to an opening corresponding to the value of the pressure difference ΔP. [Step S44-3] The valve opening time according to the pressure difference ΔP is measured.

[Step S44-4] The output of the control signal is stopped, the output of the drive signal by the valve drive unit 20 is stopped, and the discharge valve 18 is closed. From the above,
Tire 8 with flow rate corresponding to valve opening and valve opening time
The air inside is exhausted to the outside. It should be noted that the pressure difference ΔP preset and stored in the ROM 25 and the discharge valve 18
The relationship between the valve opening degree and the valve opening time is, for example, as shown in the graphs of FIGS. That is, when the absolute value of ΔP is large, the valve opening is increased and the valve opening time is lengthened. Conversely, when the absolute value of ΔP is small, the valve opening is reduced and the valve opening time is shortened. And Δ
The relationship between P and the valve opening is set to be proportional, and the relationship between ΔP and the valve opening time is set to be proportional.

Here, when the control is performed according to the flowcharts shown in FIGS. 26 to 28, the timing of the actual pressure measurement and the timing of the operation of the charge valve 17 or the discharge valve 18 are shown in FIG. It looks like a time chart. That is, the first measurement of the air pressure is performed in [Step S38] (A shown in FIG. 31), and then, in [Step S43] or [Step S44], the pressure increase or pressure reduction processing is performed according to ΔP (see FIG. 31). 31
B) shown in FIG. 31 and the waiting time for stabilizing the measured value in [Step S37] is measured (C shown in FIG. 31), and this is repeated. Each time the pressure increase or pressure reduction process is performed, Δ
Since the absolute value of P is small, the valve opening time is short, and the adjustment is fine. As described above, in the third embodiment, the set value input unit 11 of the air pressure adjusting unit 5
When the set value of the air pressure is input externally by the
5 measures the actual air pressure of the tire 8, and the control unit 19
A pressure difference ΔP between the actual air pressure of the tire 8 measured by the pressure sensor 15 and the set value is calculated, and the charging valve 17 by the valve drive unit 20 is operated according to the pressure difference ΔP.
Alternatively, by controlling the opening degree and the opening time of the air release valve 18,
The air pressure of the tire 8 is adjusted to the set value. Therefore, it is not necessary for the operator to adjust the air supply and the air release, and the air pressure is automatically adjusted only by inputting the set value, so that the operation is simple and the workability is improved. .

Further, since the air pressure adjusting unit 5 is connected to the vicinity of the tire valve connecting portion 7, the operator can perform all operations such as inputting set values at hand, and can perform a specific operation for setting the pressure. There is no need to move to a place, and the setting of the air pressure can be changed easily and immediately. Furthermore, since the set value can be displayed on the display unit 13, the operator can visually check the set value and prevent erroneous setting. In addition, since the value of the pressure difference ΔP between the set value and the measured value is displayed on the digital display 12b side by side with the set value at each measurement, it is necessary to confirm that the air pressure is adjusted due to the pressure difference. If the absolute value of ΔP does not gradually decrease, the operator can easily recognize that a connection error or the like of the tire valve connection portion 7 to the tire valve 9 has occurred. . Further, since the buzzer 22 sounds at the end of the adjustment, the operator can easily know the end of the adjustment.

In the third embodiment, the tire valve connecting portion 7 is normally opened, but may be normally closed. The relationship between the absolute value of the pressure difference ΔP preset and stored in the ROM 25 and the valve opening and valve opening time of the charge valve 17 or the discharge valve 18 is not limited to the above, and can be changed as necessary. It is. For example, O
When an inexpensive valve that can control only N-OFF (open / close) is adopted, the relationship shown in FIG. 34 and FIGS. 35 to 39 may be used. The relationship shown in FIG. 34 and FIGS. 35 to 39 can of course be applied to the third embodiment in which both the valve opening and the valve opening time are controlled to be changed.

Next, FIG. 16 to FIG. 18, FIG. 32 and FIG.
A fourth embodiment of the present invention will be described with reference to FIGS. In the fourth embodiment, similarly to the second embodiment, as shown in FIG. 16, a digital display 12a for displaying a set value of air pressure is provided on a display window 12 and, for example, LEDs arranged in a row below the digital display 12a. A plurality of light emitting elements 12c are provided. Then, the light emitting element 12c is turned on according to the magnitude of the pressure difference ΔP between the set value of the air pressure and the measured value. In this case, only one light may be turned on as shown in FIG. 17, or a plurality of light emitting elements 12c may be turned on as shown in FIG. In the second embodiment, the pressure difference ΔP
Is displayed, and the light-emitting element 12c is blinked to indicate that the pressure increasing or depressurizing process is being performed, so that the operator can easily recognize the fact. Therefore, the control content of the control unit 19 is the same as that of the third embodiment except for the display, and different portions will be described below.

FIG. 32 is a flowchart for performing the pressure increasing process corresponding to FIG. 27 of the third embodiment. The process of [Step S43-3] in FIG. 27 is changed to the following [Step S43-3a] in FIG. [Step S43-3a] The valve opening time according to the pressure difference ΔP is measured. Further, the fact that the pressure increasing process is being performed is indicated by blinking the light emitting element 12c in the + direction. here,
FIGS. 23A to 23E are examples in which the light-emitting element 12c blinks in the negative direction. On the contrary, the light-emitting element 12c blinks in the positive direction. FIG. 33 is a flowchart for performing a pressure reduction process corresponding to FIG. 28 of the third embodiment. The processing of [Step S44-3] in FIG.
-3a].

[Step S44-3a] The valve opening time according to the pressure difference ΔP is measured. Further, the light emitting element 12c
Is indicated by blinking. That is, as shown in FIGS. 23A to 23E, the light emitting element 12c blinks in the negative direction. The blinking of the light emitting element 12c during the measurement of the valve opening time may be as shown in FIGS. 24 (A) to 24 (J). In the first to fourth embodiments described above, the ROM 25 is
As shown in FIG. 3 and FIG. 14, the valve opening degree and the valve opening time corresponding to the pressure difference ΔP are stored as map data, but as shown in the following fifth to eighth embodiments, ON as valve 17 or air release valve 18
When an inexpensive valve that can be controlled only by OFF (open / close) is used, the valve opening time as shown in FIGS. 35 to 39 for the pressure difference ΔP may be stored in the ROM 25.

Hereinafter, a fifth embodiment of the present invention will be described with reference to FIGS. The fifth embodiment is different from the first embodiment in that the valve opening degree is always constant and the valve opening time is changed and controlled. FIG. 40 is a flowchart of the pressure increasing process shown in FIG. 7 of the first embodiment [Step S21-
2] to [Step S21-2a] below [Step S21-2a]
21-3] to [Step S21-3a] below, and [Step S21-14] to [Step S21-14]
a) is obtained by changing [Step S21-16] to the following [Step S21-16a], and FIG. 41 shows [Step S21-1] of the pressure increasing process of the first embodiment shown in FIG.
0] to [Step S21-10a]. FIG. 42 is a flowchart of [Step S22-2] of the decompression process shown in FIG.
2a], [Step S22-3] is replaced with the following [Step S22-3a], [Step S22-14] is replaced with the following [Step S22-14a], and [Step S22-1]
6] is changed to the following [Step S22-16a], and FIG. 43 is obtained by replacing [Step S22-10] of the decompression process shown in FIG. 10 of the first embodiment with the following [Step S2-16].
2-10a].

[Step S21-2a] RO
The valve opening time of the charge valve corresponding to the value of the pressure difference ΔP written in M25 is read. [Step S21-3a] The charging valve 17 is opened. [Step S21-10a] Change the pressure change rate a _(FOA) to RA
Write to M24. [Step S21-14a] If it is determined in step S21-1 that the pressure increasing operation is not the first time, then in this step, R is determined in [step S21-10a].
The pressure change rate a _(FOA) written in AM24 is read. [Step S21-16a] By the valve driving unit 20,
The charging valve 17 is opened.

[Step S22-2a] RO
The valve opening time of the discharge valve corresponding to the value of the pressure difference ΔP written in M25 is read. [Step S22-3a] The air release valve 18 is opened. [Step S22-10a] Change the pressure change rate a _(ROA) to RA
Write to M24. [Step S22-14a] If it is determined in step S22-1 that the depressurizing operation is not the first time, in this step, R is determined in [step S22-10a].
The pressure change rate a _(ROA) written in AM24 is read. [Step S22-16a] The discharge valve 18 is opened by the valve drive unit 20.

A sixth embodiment of the present invention will be described with reference to FIGS. The sixth embodiment is different from the second embodiment in that the valve opening degree is always constant and the valve opening time is controlled to be changed.
This is the same as the above-described modification of the fifth embodiment with respect to the first embodiment. That is, FIG. 44 shows that [Step S21-2] of the pressure increasing process shown in FIG. 19 of the second embodiment is replaced with [Step S21-2a] and [Step S21-3] is replaced with [Step S21-3a]. [Step S21-14] is replaced with [Step S21-14a] and [Step S21-
16] is changed to the above-mentioned [Step S21-16a], and FIG. 45 is obtained by replacing [Step S21-10] of the pressure increasing process shown in FIG. 20 of the second embodiment with [Step S21-1].
0a]. FIG. 46 is a flowchart of the decompression process shown in FIG. 21 of the second embodiment (Step S22-2).
To [Step S22-2a] and [Step S22
-3] to [Step S22-3a] and [Step S22-14] to [Step S22-14a].
[Step S22-16] is replaced with [Step S22-1]
6a], and FIG. 47 is obtained by changing [Step S22-10] of the decompression process shown in FIG. 22 of the second embodiment to the above [Step S22-10a].

Next, a seventh embodiment of the present invention will be described with reference to FIGS. The seventh embodiment is different from the third embodiment in that the valve opening degree is always fixed and the valve opening time is controlled to be changed. FIG. 48 is a flowchart of the pressure increase process [Step S43-1] shown in FIG. 27 of the third embodiment, which is replaced with the following [Step S43-1a].
[Step S43-2] is changed to the following [Step S43-2]
a), and FIG. 49 is obtained by replacing [Step S44-1] of the pressure reduction process shown in FIG. 28 of the third embodiment with the following [Step S44-1a] and [Step S44-2].
Is changed to the following [Step S44-2a]. [Step S43-1a] The charging valve 17 corresponding to the value of the pressure difference ΔP, which is written in the ROM 25 in advance.
Read the valve open time. [Step S43-2a] The charge valve 17 is opened by the valve drive unit 20. [Step S44-1a] The release valve 18 corresponding to the value of the pressure difference ΔP, which is written in the ROM 25 in advance.
Read the valve open time. [Step S44-2a] The air release valve 18 is opened by the valve drive unit 20.

Next, an eighth embodiment of the present invention will be described with reference to FIGS. Note that the eighth embodiment is different from the fourth embodiment in that the valve opening degree is always fixed and the valve opening time is controlled to be changed. This is the same as the modification of the fifth embodiment with respect to the example. That is, FIG. 50 is obtained by changing [Step S43-1] shown in FIG. 32 of the fourth embodiment to [Step S43-1a] and [Step S43-2] to [Step S43-2a]. FIG. 51 is a flowchart showing the operation of the fourth embodiment shown in FIG. 33 [Step S44-1].
To [Step S44-1a] and [Step S44
-2] to [Step S44-2a]. In the first to fourth embodiments, the ROM 2
5, the valve opening degree and the valve opening time with respect to the pressure difference ΔP are stored as map data as shown in FIG. 13 and FIG.
As shown in the embodiment, when a valve whose opening time is constant and whose opening can be controlled is adopted as the charging valve 17 or the discharging valve 18, the ROM 25 stores the pressure difference ΔP in FIGS. What is necessary is just to store the valve opening degree as shown. Note that the relationships shown in FIGS. 52 to 56 are changed from the first to fourth values for changing and controlling both the valve opening and the valve opening time.
Of course, it is also possible to apply to the embodiment.

A ninth embodiment of the present invention will be described with reference to FIGS. Note that the ninth embodiment is
In contrast to the third embodiment, the valve opening time is always fixed and the valve opening is controlled to be changed. Fig. 57
Is shown in FIG. 27 of the third embodiment [Step S43-1].
To [Step S43-1a] below, [Step S4
FIG. 58 is obtained by changing [3-3] to the following [Step S43-3a], and FIG. 58 is obtained by replacing [Step S44-1] in FIG. 28 of the third embodiment with the following [Step S44-1a].
[Step S44-3] is changed to the following [Step S44-3]
a). [Step S43-1a] The charging valve 17 corresponding to the value of the pressure difference ΔP, which is written in the ROM 25 in advance.
Read the valve opening of. [Step S43-3a] The charge valve 17 is kept open by the valve drive unit 20 for a predetermined time. [Step S44-1a] The release valve 18 corresponding to the value of the pressure difference ΔP, which is written in the ROM 25 in advance.
Read the valve opening of. [Step S44-3a] The open state of the air release valve 18 is maintained by the valve drive unit 20 for a predetermined time.

Next, a tenth embodiment of the present invention will be described with reference to FIGS. Note that this tenth
This embodiment is different from the fourth embodiment in that the valve opening time is always constant and the valve opening is controlled to be changed. FIG. 59 shows the fourth embodiment shown in FIG.
43-1] to [Step S43-1a] below, and [Step S43-3] to the following [Step S43-3a].
FIG. 60 is the same as FIG. 33 of the fourth embodiment.
[Step S44-1] is changed to the following [Step S44-
1a], [Step S44-3] is changed to the following [Step S44-3a]. [Step S43-1a] The charging valve 17 corresponding to the value of the pressure difference ΔP, which is written in the ROM 25 in advance.
Read the valve opening of. [Step S43-3a] The charge valve 17 is kept open by the valve drive unit 20 for a predetermined time. Further, the fact that the pressure increasing process is being performed is indicated by the light emitting element 1.
2c is indicated by blinking in the + direction. [Step S44-1a] The release valve 18 corresponding to the value of the pressure difference ΔP, which is written in the ROM 25 in advance.
Read the valve opening of. [Step S44-3a] The charge valve 17 is kept open by the valve drive unit 20 for a predetermined time. Further, it is confirmed that the light-emitting element 1 is being decompressed.
2c is indicated by blinking in the negative direction.

The display window 12 is not limited to the configuration shown in FIG. 16. For example, as shown in FIG. 61, an analog meter 12d is provided below a digital display 12a, and a pressure difference is displayed by the analog data 12d. You may.

[0074]

As described in detail above, claim 1 of the present invention
According to the described tire pressure adjusting device, the actual tire pressure
As the valve operation amount in response to a pressure difference between the pressure and the set value
In order to control the valve opening , the number of valve operations required until the tire air pressure reaches the set value can be reduced compared to the system that controls the valve to open at a constant opening regardless of the pressure difference. The time until the adjustment is completed can be reduced. Moreover, the valve opening is controlled.
For example, when the pressure difference is small,
Adjustments can be made.

According to the tire pressure adjusting device of the second aspect of the present invention, the valve opening degree and the valve opening time are controlled in accordance with the pressure difference, so that the valve is controlled to be opened for a fixed time regardless of the pressure difference. The number of valve operations required until the tire air pressure reaches the set value can be reduced, and the time required to complete the air pressure adjustment can be shortened. In addition, since the end means for terminating the control when the pressure difference falls within the predetermined range is provided, the control can be automatically terminated.

According to the third aspect of the present invention, since the valve opening degree and the valve opening time are controlled in accordance with the pressure difference, the valve is controlled to be opened for a fixed time regardless of the pressure difference. The number of valve operations required until the tire air pressure reaches the set value can be reduced, and the time required to complete the air pressure adjustment can be shortened. In addition, the actual pressure change rate (depending on the type of tire) of the tire, which is determined in the charging or discharging process by the first air pressure adjusting means, is used to open the next charging or discharging valve. Since the time is set, the time required for adjusting the air pressure to the set value can be further reduced.

According to a fourth aspect of the present invention, in addition to the second or third aspect, the valve opening stored in the storage means is a constant opening. Since the opening time is set to be longer when the pressure difference is large, only the valve opening time needs to be controlled, and thus the cost of the apparatus can be reduced.

According to a fifth aspect of the present invention, in addition to the second aspect, the valve opening time stored in the storage means is constant and the valve opening degree is equal to the pressure. When the difference is large, the value is set to be large, so that only the valve opening degree needs to be controlled, so that the cost of the apparatus can be reduced.

According to the tire pressure adjusting device of the sixth aspect of the present invention, in addition to the one of the first to fifth aspects, the display means includes a set value and a pressure inputted from the input means. Since the differences are displayed, the operator can recognize them.

According to a seventh aspect of the present invention, in addition to the above-mentioned sixth aspect, the control means includes a plurality of display means for displaying a plurality of images in accordance with the pressure difference calculated by the pressure difference calculating means. Lights left and right with the center of the element as a boundary, so that when the air charge valve is opened and the air discharge valve is opened by the air pressure adjusting means, it flashes in the opposite direction to each other. To control it,
It is possible to make the worker recognize that there is a pressure difference and that the air is discharged or filled in association with the pressure difference.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a tire pressure adjusting head of a tire pressure adjusting device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a tire pressure adjusting head of the tire pressure adjusting device according to the first embodiment of the present invention is connected to a tire valve.

FIG. 3 is a block diagram showing a tire pressure adjusting device according to a first embodiment of the present invention.

FIG. 4 is a flowchart showing a mode setting content of a tire pressure adjusting process of the tire pressure adjusting device according to the first embodiment of the present invention.

FIG. 5 is a first stage of a flowchart showing the control content of the air pressure adjustment process of the tire air pressure adjusting device according to the first embodiment of the present invention.

FIG. 6 is a second half of a flowchart showing the control content of the air pressure adjustment process of the tire air pressure adjusting device according to the first embodiment of the present invention.

FIG. 7 is a first part of a flowchart showing the control contents of the pressure increasing process of the tire air pressure adjusting device according to the first embodiment of the present invention.

FIG. 8 is a second half of a flowchart showing the control contents of the pressure increasing process of the tire air pressure adjusting device according to the first embodiment of the present invention.

FIG. 9 is a first part of a flowchart showing the control contents of the decompression process of the tire air pressure adjusting device according to the first embodiment of the present invention.

FIG. 10 is a second half of a flowchart showing the control contents of the pressure reduction processing of the tire air pressure adjusting device according to the first embodiment of the present invention.

FIG. 11 is a characteristic diagram showing a state of pressure with respect to time during a pressure increase process of the tire air pressure adjusting device according to the first embodiment of the present invention.

FIG. 12 is a characteristic diagram showing a state of pressure with respect to a time after the next time when the same type of tire is pressure-adjusted by the tire air-pressure adjusting apparatus according to the first embodiment of the present invention.

FIG. 13 is a graph showing an example of the relationship between the absolute value of the pressure difference ΔP between the set value and the measured value of the air pressure of the tire air pressure adjusting device according to the first embodiment of the present invention and the valve opening at the time of the initial setting. .

FIG. 14 is a graph showing an example of the relationship between the absolute value of the pressure difference ΔP between the set value and the measured value of the air pressure of the tire air pressure adjusting device according to the first embodiment of the present invention and the valve opening time at the time of initial setting. .

FIG. 15 is a graph showing a relationship between time and pressure at the time of air pressure adjustment of the tire air pressure adjusting device.

FIG. 16 is a front view showing a display means of the tire pressure adjusting device according to the second embodiment of the present invention.

FIG. 17 is a front view showing an example of a pressure difference display of the display means of the tire pressure adjusting device according to the second embodiment of the present invention.

FIG. 18 is a front view showing another example of the pressure difference display of the display means of the tire pressure adjusting device according to the second embodiment of the present invention.

FIG. 19 is a first part of a flowchart showing the control contents of the pressure increasing process of the tire pressure adjusting device according to the second embodiment of the present invention.

FIG. 20 is a second half of a flowchart showing the control contents of the pressure increasing process of the tire air pressure adjusting device according to the second embodiment of the present invention.

FIG. 21 is a first part of a flowchart showing the control contents of the pressure reduction process of the tire air pressure adjusting device according to the second embodiment of the present invention.

FIG. 22 is a second half of a flowchart showing the control contents of the pressure reduction processing of the tire air pressure adjusting device according to the second embodiment of the present invention.

FIG. 23 is a front view showing a display example of the display means of the tire pressure adjusting device according to the second embodiment of the present invention in a time series from (A) to (E).

FIG. 24 is a front view showing another example of the display of the display means of the tire pressure adjusting device according to the second embodiment of the present invention in chronological order from (A) to (J).

FIG. 25 is a flowchart showing the contents of the mode setting of the air pressure adjusting process of the tire air pressure adjusting apparatus according to the third embodiment of the present invention.

FIG. 26 is a flowchart showing the control contents of the air pressure adjusting process of the tire air pressure adjusting device according to the third embodiment of the present invention.

FIG. 27 is a flowchart showing the control contents of the pressure increasing process of the tire pressure adjusting device according to the third embodiment of the present invention.

FIG. 28 is a flowchart showing the control contents of a pressure reduction process of the tire pressure adjusting device according to the third embodiment of the present invention.

FIG. 29 is a graph showing an example of the relationship between the absolute value of the pressure difference ΔP between the set value and the measured value of the air pressure of the tire air pressure adjusting device according to the third embodiment of the present invention, and the valve opening.

FIG. 30 is a graph showing an example of a relationship between an absolute value of a pressure difference ΔP between a set value and a measured value of a pneumatic pressure of a tire pressure adjusting device according to a third embodiment of the present invention, and a valve opening time.

FIG. 31 is a time chart showing a relationship between an output timing of a measurement signal and an output timing of a control signal for valve operation during a pneumatic pressure adjustment process of the tire pressure adjusting apparatus according to the third embodiment of the present invention.

FIG. 32 is a flowchart showing the control contents of the pressure increasing process of the tire air pressure adjusting device according to the fourth embodiment of the present invention.

FIG. 33 is a flow chart showing the control contents of the pressure reduction process of the tire pressure adjusting device according to the fourth embodiment of the present invention.

FIG. 34 is a graph showing another example of the relationship between the absolute value of the pressure difference ΔP between the set value and the measured value of the air pressure of the tire air pressure adjusting device according to the fourth embodiment of the present invention, and the valve opening degree. .

FIG. 35 shows a pressure difference ΔP between a set value and a measured value of the air pressure of the tire air pressure adjusting devices according to the fifth to eighth embodiments of the present invention.
6 is a graph showing an example of the relationship between the absolute value of the pressure and the valve opening time.

FIG. 36 shows a pressure difference ΔP between a set value and a measured value of the air pressure of the tire air pressure adjusting devices according to the fifth to eighth embodiments of the present invention.
7 is a graph showing another example of the relationship between the absolute value of and the valve open time.

FIG. 37 shows a pressure difference ΔP between a set value and a measured value of the air pressure of the tire air pressure adjusting devices according to the fifth to eighth embodiments of the present invention.
9 is a graph showing still another example of the relationship between the absolute value of and the valve open time.

FIG. 38 shows a pressure difference ΔP between a set value and a measured value of the air pressure of the tire air pressure adjusting devices according to the fifth to eighth embodiments of the present invention.
9 is a graph showing still another example of the relationship between the absolute value of and the valve open time.

FIG. 39 is a pressure difference ΔP between a set value and a measured value of the air pressure of the tire air pressure adjusting devices according to the fifth to eighth embodiments of the present invention.
9 is a graph showing still another example of the relationship between the absolute value of and the valve open time.

FIG. 40 is a front part of a flowchart showing the control contents of the pressure increasing process of the tire air pressure adjusting device according to the fifth embodiment of the present invention.

FIG. 41 is a second half of a flowchart showing the control contents of the pressure increasing process of the tire air pressure adjusting device according to the fifth embodiment of the present invention.

FIG. 42 is a front part of a flowchart showing the control contents of the pressure reduction process of the tire air pressure adjusting device according to the fifth embodiment of the present invention.

FIG. 43 is a second half of a flowchart showing the control content of the pressure reduction process of the tire air pressure adjusting device according to the fifth embodiment of the present invention.

FIG. 44 is a front part of a flowchart showing the control contents of the pressure increasing process of the tire air pressure adjusting device according to the sixth embodiment of the present invention.

FIG. 45 is a second half of a flowchart showing the control contents of the pressure increasing process of the tire air pressure adjusting device according to the sixth embodiment of the present invention.

FIG. 46 is a front part of a flowchart showing the control contents of the pressure reduction processing of the tire air pressure adjusting device according to the sixth embodiment of the present invention.

FIG. 47 is a second half of a flowchart showing the control content of the pressure reduction process of the tire air pressure adjusting device according to the sixth embodiment of the present invention.

FIG. 48 is a flowchart showing the control contents of the pressure increasing process of the tire pressure adjusting device according to the seventh embodiment of the present invention.

FIG. 49 is a flowchart showing the control contents of a pressure reduction process of the tire air-pressure adjusting device according to the seventh embodiment of the present invention.

FIG. 50 is a flowchart showing the control contents of the pressure increasing process of the tire pressure adjusting device according to the eighth embodiment of the present invention.

FIG. 51 is a flowchart showing the control content of a pressure reduction process of the tire air pressure adjusting device according to the eighth embodiment of the present invention.

FIG. 52 is a graph showing an example of a relationship between an absolute value of a pressure difference ΔP between a set value and a measured value of the air pressure of the tire air pressure adjusting devices according to ninth and tenth embodiments of the present invention, and a valve opening degree. .

FIG. 53 is a graph showing another example of the relationship between the absolute value of the pressure difference ΔP between the set value and the measured value of the pneumatic pressure of the ninth and tenth embodiments of the present invention and the valve opening degree. It is.

FIG. 54 shows still another example of the relationship between the absolute value of the pressure difference ΔP between the set value and the measured value of the air pressure of the tire air pressure adjusting devices according to the ninth and tenth embodiments of the present invention and the valve opening degree. It is a graph.

FIG. 55 shows still another example of the relationship between the absolute value of the pressure difference ΔP between the set value and the measured value of the tire pressure of the ninth and tenth embodiments of the present invention and the valve opening degree. It is a graph.

FIG. 56 shows still another example of the relationship between the absolute value of the pressure difference ΔP between the set value and the measured value of the air pressure of the tire air pressure adjusting devices according to the ninth and tenth embodiments of the present invention, and the valve opening. It is a graph.

FIG. 57 is a flowchart showing the control contents of the pressure increasing process of the tire pressure adjusting device according to the ninth embodiment of the present invention.

FIG. 58 is a flowchart showing the control contents of a pressure reduction process of the tire air pressure adjusting device according to the ninth embodiment of the present invention.

FIG. 59 is a flowchart showing the control contents of the pressure increasing process of the tire pressure adjusting device according to the tenth embodiment of the present invention.

FIG. 60 is a flowchart showing the control contents of a pressure reduction process of the tire air-pressure adjusting device according to the tenth embodiment of the present invention.

FIG. 61 is a front view showing a modification of the display means of the tire pressure adjusting device of the present invention.

[Explanation of symbols]

 2 Pneumatic pressure source 7 Tire valve connection part (connection means) 8 Tire 9 Tire valve 11 Set value input part (input means) 13 Display part (display means) 15 Pressure sensor (air pressure measurement means) 17 Charging valve 18 Air release valve 19 Control part (control means) 20 Valve drive part (valve drive means) 24 RAM (holding means) 25 ROM (storage means)

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Minoru Tanaka 23-31 Iwaki Plant, Jobanshita-Funamachi, Iwaki-shi, Fukushima Japan Automatic Machine Co., Ltd. Inside the Iwaki Plant (56) References JP, A) JP-A-59-170913 (JP, A) JP-A-4-169363 (JP, A) JP-A-60-53451 (JP, A) JP-A-4-8652 (JP, A) Hei 3-76260 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) G05D 16/00-16/20 B60S 5/04 B60C 23/00

Claims (7)

(57) [Claims] An air pressure source for supplying compressed air; connecting means for opening the tire valve when connected to the tire valve; input means for inputting a set value of the tire air pressure; Pneumatic pressure measurement means for measuring, an air charge valve for switching between communication and shutoff between the connection means and the air pressure source, an air release valve for switching between communication and shutoff between the connection means and the atmosphere, the air charge valve and an air release valve As the valve operation amount of
Valve driving means for controlling the valve opening degree of each , the valve opening degree as a valve operation amount according to the pressure difference between the set value input by the input means and the tire air pressure measured by the air pressure measuring means Storage means for storing, reading from the storage means a valve opening degree as a valve operation amount corresponding to a pressure difference between a set value set by the input means and a tire air pressure measured by the air pressure measurement means, Control means for controlling the valve driving means based on a valve opening degree . 2. The valve operation amount is added to a valve opening degree.
The storage means stores a valve opening degree and a valve opening time according to the pressure difference, and the control means includes a set value set by the input means and the air pressure measurement means. Reading from the storage means the valve opening degree and valve opening time according to the pressure difference from the tire air pressure measured at,
Pneumatic pressure adjusting means for controlling the valve driving means to open and control the charging valve or the discharging valve at the valve opening degree for the valve opening time; and after the control of the air pressure adjusting means, the tire pressure and the set value 2. The tire pressure adjustment according to claim 1, further comprising: a pressure difference calculating means for calculating a pressure difference between the first and second tires; and a ending means for ending the control when the pressure difference by the pressure difference calculating means falls within a predetermined range. apparatus. 3. The valve operation amount is added to a valve opening degree.
The storage means stores a valve opening degree and a valve opening time according to the pressure difference, and the control means includes a set value set by the input means and the air pressure measurement means. Reading from the storage means the valve opening degree and valve opening time according to the pressure difference from the tire air pressure measured at,
A first air pressure adjusting means for controlling the valve driving means to open and control the air charge valve or the discharge valve at the valve opening degree for the valve opening time; and a tire at the time of control by the first air pressure adjusting means. Change rate calculating means for calculating the pressure change rate of the air pressure, holding means for storing the valve opening degree and the pressure change rate, and after the control of the first air pressure adjusting means, the tire pressure and the set value. A first pressure difference calculating means for calculating the pressure difference, and a pressure difference by the first pressure difference calculating means is divided by the pressure change rate to obtain a valve opening time, and the valve opening time and the holding time are obtained. Second air pressure adjusting means for controlling the charge valve or the discharge valve according to the valve opening stored in the means; and, after the control of the second air pressure adjusting means, the tire pressure and the setting. Pressure difference calculating means for calculating a pressure difference between the first pressure difference calculating means and the second pressure difference calculating means, and a terminating means for terminating the control when the pressure difference caused by any of the first pressure difference calculating means and the second pressure difference calculating means falls within a predetermined range. 2. The method according to claim 1, wherein
The tire pressure adjusting device as described in the above. 4. The valve opening stored in the storage means is a constant opening, and the valve opening time is set to be longer when the pressure difference is large. Or the tire pressure adjusting device according to 3. 5. The valve according to claim 2, wherein the valve opening time stored in the storage means is constant, and the valve opening is set to increase when the pressure difference is large. Tire pressure adjusting device. 6. The tire pressure adjusting device according to claim 1, further comprising a display unit that displays the set value input from the input unit and the pressure difference. 7. The display means comprises: a digital display unit for displaying the set value; and a plurality of display elements arranged in a row for displaying the pressure difference. According to the pressure difference calculated by the pressure difference calculation means, the left and right lights are lit at the center of the plurality of display elements, and when the charge valve is open and when the discharge valve is open, The tire pressure adjusting device according to claim 6, wherein the tire air pressure adjusting devices are controlled to blink in opposite directions.