JP2002195441A - Drive for solenoid valve, and air massage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple and low-cost drive capable of discriminating if a solenoid valve is locked, and if the solenoid valve is opened or short- circuited. SOLUTION: In a drive circuit 30 for controlling a transistor Tr1 by a signal ϕ1 from a microcomputer 32 to switch a solenoid valve 17 on/off, a current flowing through the solenoid valve is converted into a voltage V0 by a resistor R2 to be taken into the microcomputer 32. The voltage is compared with a specified discrimination value in a first discriminating part 38 to discriminate if the solenoid valve 17 is opened or short-circuited. If the solenoid valve 17 is locked or not is discriminated based on if there is a fall in the voltage V0 sampled in a specified period after it is switched on or not. The abnormality in the solenoid valve can thus be totally discriminated by a simple constitution using the microcomputer 32. By discriminating abnormality when locking of the solenoid valve is detected for a plurality of times in accordance with the motion of an air massaging device, safety and favorable usability of the air massaging device can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for an electromagnetic valve in which a mover reciprocates in accordance with on / off of DC power.

[0002]

2. Description of the Related Art There is known an air massager which supplies and exhausts air to repeatedly inflate and contract an airbag. FIG. 10 schematically shows the air massage device. The air massage device 100 shown in this figure includes an airbag 15 that can be expanded and contracted by air, an air pump 16 that supplies air to the airbag 15, a solenoid valve 17 that exhausts air in the airbag, and It has a hose 18 to be connected, and a controller 101 for controlling the air pump 16 and the solenoid valve 17.

The electromagnetic valve 17 has a small direct current (DC) type because it is hardly burned out, and a portable type, for example, a massage device using a cigarette lighter of a car as a power source is convenient as a power source. Valves are often used. FIG. 11 shows an example of the solenoid valve 17. FIG.
FIG. 11A shows the state of the solenoid valve 17 when not energized (off), and FIG. 11B shows the state of the solenoid valve 17 when energized (on).
Is a normally open solenoid valve through which air passes when power is not supplied. A normally closed solenoid valve that opens when energized (when turned on) and does not allow air to pass when electricity is not energized is of course possible, and can be installed on the exhaust side or intake side of the air path, or the concept of system protection. In many cases, the type that becomes failsafe from is adopted. Both types are equivalent as the operation of the solenoid valve,
In the present specification, unless otherwise required, a description will be given assuming that power is turned on and non-current is turned off irrespective of the normally open state and the normally closed state.

The solenoid valve 17 has a cylindrical main body 61 and a bobbin 65 having a hollow portion 61a formed inside the main body 61.
And a coil 66 wound around the bobbin 65, and a plunger (movable element) 62 that reciprocates in the hollow portion 61a when the coil 66 is excited. The hollow portion 61a has a structure that can shut off air when the coil 66 is excited and the mover 62 moves against the spring 67, and the nozzles 63 and 64 are connected to the hollow portion 61a.

As schematically shown in FIG. 12, the controller 101 has a drive portion or a drive circuit 104 that functions as a drive device for driving the solenoid valve 17. The drive circuit 104 is provided with the air massage device 100
, That is, the function of a microcomputer (microcomputer) 103 that controls the pump including the pump 16 and the like. The control signal φ1 is supplied to a terminal 103a of the microcomputer 103 which supplies a control signal φ1 of the solenoid valve.
A switch (transistor switch) Tr1 for turning on / off the supply of DC power to the power supply is connected. Further, appropriate resistors R1 and R3 for operating the switch Tr1 are connected.

FIG. 13 shows the operation of the air massage device 100. First, in the period A, the air pump 16 is driven to suck air into the airbag 15 and power is supplied to the electromagnetic valve 17 to close it. Therefore, the airbag 15
Is expanded by the air supplied from the air pump 16. Next, in the period B, the air pump 16 is stopped, and the airbag 15 is maintained at the predetermined size. Next, in a period C, when the power supplied to the solenoid valve 17 is turned off, the solenoid valve 17 is opened, and the air is exhausted from the airbag 15 and contracted. By repeating the control of the air pump 16 and the electromagnetic valve 17 in this manner, the airbag 15 is repeatedly inflated and contracted, and an affected part, for example, an appropriate part such as a waist or a shoulder is massaged.

[0007]

In such an air massage device 100, the plunger 6 of the solenoid valve 17 is used.
2 may be locked for some reason, such as dust. Since the normally open solenoid valve is employed, when the pump 16 is locked when the pump is turned off, the airbag 15 does not inflate even when the pump 16 is operated. However, if the air bag 15 is locked at the time of turning on, the air bag 15 may be over-inflated, or the air pump may be overloaded and the temperature may rise, which is not preferable for safety. Further, if such a phenomenon continues, the life of components such as a pump may be shortened.

Further, since the solenoid valve 17 has the coil 66 built therein, there is a possibility that this open or short circuit may occur. Therefore, in order to determine whether or not the air massage device is operating normally, the following is required. It is desirable that any abnormality can be detected in the same manner as the lock of the plunger 62. Further, a portable air massage device that can be mounted on a backrest such as an automobile seat or an office chair is being studied, and a compact and low-cost device for detecting the above-described abnormality is required. You.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a simple and low-cost drive device that can determine whether the plunger of the solenoid valve is locked and whether the coil of the solenoid valve is open or short. Furthermore, by using the driving device, a compact and low-cost air massage device using an electromagnetic valve, which can detect the abnormality with high accuracy and can be easily used at any time with ease. It is an object.

[0010]

The locked state of the movable element of the solenoid valve can be detected from a change in the current I0 flowing through the solenoid valve 17 when the solenoid valve is turned on when energization is started. is there. That is, when the mover moves normally, the current I0 increases immediately after starting the supply of DC power to excite the coil, and thereafter, when the mover moves, the current I0 is temporarily reduced by the back electromotive force. It shows a characteristic that it decreases (falls) and then increases again and becomes almost constant.
Therefore, it is possible to determine whether or not the vehicle is locked by detecting the drop of the current I0. On the other hand, whether the solenoid valve is open or short can be determined by the value or range of the current flowing when the solenoid valve is on or off. Although it is difficult to detect the current flowing through the circuit itself, it is easy to detect the current by converting it into a voltage, and it is possible to control the program by taking it into a microcomputer.

For this reason, in the drive apparatus for an electromagnetic valve according to the present invention, in which the mover reciprocates according to the on / off of the DC power, a switching means for turning on / off the DC power, and a current flowing through the solenoid valve is converted into a voltage. Voltage converting means, first determining means for comparing the voltage with a predetermined value or range when the switching means is on and / or off, and determining whether the solenoid valve is open or short; A second determining means for determining the lock of the mover based on the voltage drop when the solenoid valve is locked, and detecting the current flowing through the solenoid valve to comprehensively determine the abnormality of the solenoid valve such as lock, open and short. I can do it. By converting the current flowing through the solenoid valve into a voltage and inputting the voltage to the microcomputer, the microcomputer can be used as the first and second determination means, and includes a one-chip microcomputer. Further, it is possible to provide a driving device capable of comprehensively determining the abnormality of the solenoid valve by using a driving device having a simple configuration at a low cost.

Therefore, the method of controlling a drive device for an electromagnetic valve in which DC power is turned on / off by the switching means and the mover reciprocates in response to the switching means is provided when the switching means is on and / or off. A first determining step of comparing a current flowing through the valve or a voltage obtained by converting the current with a predetermined value or range to determine whether the solenoid valve is open or short; and a drop in current or voltage when the switching means is turned on. And a second determining step of determining whether the mover is locked, and can be provided as a drive device control program having instructions capable of executing these steps. As described above, it is easier to process by a computer when the voltage is converted.

The electromagnetic valve driving device of the present invention, an electromagnetic valve driven by the electromagnetic valve driving device, and an airbag in which intake and / or exhaust is controlled by the electromagnetic valve and which repeatedly expands and contracts In the air massage device having the above, since the abnormality of the solenoid valve is comprehensively determined, the presence or absence of the abnormality can be reliably determined, and a safe and highly durable air massage device can be provided. Further, the lock of the mover is determined only within a predetermined period after the switching means is turned on, and is not performed when the switching means is turned off or in a steady state. Further, the determination of whether the coil of the solenoid valve is open or short may be made at an appropriate timing immediately after the switching means is turned on or off, and the amount of processing in the first and second determination steps is small.
For this reason, high-speed processing is not required, and there is almost no increase in cost due to adding a function of judging abnormality of the solenoid valve to the microcomputer in addition to controlling the solenoid valve and the pump. Therefore, an air massage device that can be used with more security can be provided at low cost.

Further, in the air massage device, since the expansion and contraction are repeated, the solenoid valve is also repeatedly turned on and off. Therefore, it is possible to monitor in a short time that the switching means is turned on a plurality of times, and if the mover is locked when the voltage drop is not continuous a plurality of times when the switching means is turned on a plurality of times. By making a final determination, erroneous detection due to various factors can be prevented. The voltage or current drop is determined when the voltage or current is sampled at predetermined intervals to determine the maximum value, and when the sampled voltage or current is lower than the maximum value and the difference from the maximum value exceeds a predetermined value. It is desirable to determine that you are depressed. It is possible to omit a small vertical movement of the voltage or current due to some factor, and to detect the drop with high accuracy.

Further, by providing a notifying means for outputting the judgment result of the first and / or second judging means, the abnormality of the solenoid valve such as lock, short or open can be individually or comprehensively checked by the user or the user. It can be actively communicated to maintenance personnel. For this reason, it is considered that the safety of an air massage device using an electromagnetic valve or the like can be ensured, and that the failure can be grasped and resolved at an early stage to improve the merchantability, and also to help prevent complaints.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described below with reference to the drawings. FIG. 1 shows an outline of an air massage device 1 according to an embodiment of the present invention, which can be used by being attached to a backrest 3 of an automobile seat 2. Air massage device 1 of this example
Has a substantially flat thin body 11, and is set on the backrest 3 by a fixing belt 12. Body 1
Reference numeral 1 denotes an airbag 15 whose outside is formed of a flexible urethane foam or the like, and in which an airbag 15 is expanded and contracted by air.
An air pump 16 for supplying and exhausting air to and from the air bag 15, a solenoid valve 17, and a hose 18 for connecting these are housed therein. A power cable 22a extends from the main body 11, and a cigar socket plug 22 is attached to a tip of the cable 22a. Therefore, the air pump 16 housed in the main body 11 is inserted by inserting the plug 22 into the cigar socket of the car.
And the power from the battery to the solenoid valve 17, for example,
DC 12 V DC power can be supplied. Then, the DC power is controlled by the controller 21 connected via the cable 21a.

FIG. 2 shows a power supply system of the air massage device 1 using a block diagram. DC power from the battery 23 is supplied to the controller 21 via the plug 22, the cable 22a, and the cable 21a.
On the other hand, inside the main body 11, the pump 16 and the solenoid valve 17 are connected to the high potential of the DC power, and the low potential side is guided to the controller 21, and these devices are controlled by switches inside the controller 21. The controller 21 of this example has a thin rectangular parallelepiped shape that is easy for the user to hold and operate with his / her hand, for example, 125 × 40 × 20 mm.
A switch 25 for setting the stop and operation time, a switch 26 for adjusting the degree of inflation of the bag 15 by changing the time for supplying air to the airbag 15 and setting the intensity of massage, A switch 27 for setting a contraction cycle is provided. With the switch 25 for setting the operation time, the operation time can be switched between 15 minutes and 30 minutes, and the time according to the user's preference can be set. Further, the switch 26 for setting the intensity of the massage can select “strong”, “medium” and “weak”, and can set the intensity according to the user's preference. further,
With the switch 27 that can set the speed, “fast” and “slow” can be selected, and the speed of expansion and contraction can be set according to the user's preference. The result selected by these switches is displayed by an LED 28 provided near each switch.

FIG. 3 shows a portion of the controller 21 related to a drive circuit 30 for controlling the solenoid valve 17 to be turned on and off. The drive circuit 30 of the present embodiment includes the solenoid valve 1
Transistor switch T that turns on and off the DC power to
r1 and a transistor switch Tr
A part of the function of a microcomputer (hereinafter referred to as a microcomputer) 32 for controlling the whole of the air massage apparatus 1 including on / off control of the microcomputer 1 and a memory 3 such as a ROM or a RAM used as a storage area of the microcomputer 32 or the like.
A drive circuit 30 is constituted by a part of the drive circuit 30. The transistor switch Tr1 has a base electrode connected to the control terminal 32a of the solenoid valve of the microcomputer 32 via the resistor R1.
The DC power supplied to the solenoid valve 17 is turned on / off by a signal from the controller 7 to open and close the solenoid valve 17. A resistor R2 for detecting a DC current I0 flowing through the solenoid valve 17 is connected between the emitter electrode of the transistor switch Tr1 and a low potential (ground potential). The resistor R2 converts the current I0 into a voltage V0. Voltage detection terminal 32b of microcomputer 32
Supplied to

The microcomputer 32 of this embodiment has a function of constituting the drive circuit 30 in addition to the scheduler 37 described above.
A sampling unit 36 which samples the voltage V0 input to the detection terminal 32b at a predetermined time interval and A / D converts it into digital data, and converts the sampled voltage data V0 to a predetermined value when the transistor switch Tr1 is on. Of the coil 66 of the solenoid valve 17
Alternatively, a first determination unit 38 for determining that the wiring is open or short-circuited, and a second determination for detecting whether the solenoid valve 17 is locked by detecting a drop in the sampled voltage data V0. And a unit 39. The judgment results of these judgment units 38 and 39 are supplied to the scheduler 37, and when it is detected that there is an abnormality,
Measures such as stopping the pump 16 can be taken. Further, the determination results of the determination units 38 and 39 are also input to the notification unit 40, so that a display corresponding to the determined abnormality can be output to the controller 21. For example, the presence / absence of the abnormality and the cause can be displayed by changing the blinking pattern of the LED for indicating the operation stop according to the cause of the abnormality.

The first judging section 38 compares the judgment value Hs for short judgment set in the memory 33 with the judgment value Ho for open judgment and the sampled voltage V0. If the coil 66 or the wiring is short-circuited, the current I0 becomes larger than a predetermined value, and the detected voltage V0 becomes larger than the judgment value Hs. On the other hand, the coil 66
Alternatively, if the wiring is short-circuited, the current I0 becomes smaller than a predetermined value, and the detected voltage V0 becomes smaller than the judgment value Ho.

The second judging section 39 compares the sampled voltage data V0 with the maximum value Vmax of the past voltage data and updates the latest maximum value Vmax.
When the voltage data V0 is smaller than the maximum value Vmax, a voltage determination unit 42 that detects a voltage drop depending on whether a difference between the maximum value Vmax and the voltage data V0 is equal to or greater than a predetermined determination value Va, The elapsed time after turning on the valve 17 is measured, and when a predetermined time Ta elapses, the elapsed time determination unit 43 that ends the voltage drop detection, and a drop is detected every time the solenoid valve is turned on a predetermined number of times Wa. A number-of-times determining unit 44 that finally determines that the solenoid valve is locked when not performed is provided. Also, the set values Va used in these determination units 42, 43 and 44,
Ta and Wa are set in the memory 33 in advance as described above.

FIG. 4 shows a change in the voltage V0 after the signal φ1 for turning on the solenoid valve 17 is output. The graph shown in FIG. 4 is obtained when a DC voltage of 12 V is applied, the resistance of the coil 66 of the solenoid valve 17 is approximately 100Ω, and the detection resistance R2 is approximately 1.5Ω. 0ms when φ1 is supplied, then 14ms
Voltage changes until later are shown. When the plunger 62 operates normally, as shown by the solid line X, the detected voltage V0
Increases with time, and while increasing, the plunger 6
2 moves, the back electromotive force accompanying it moves the voltage V
0 drops sharply, and immediately thereafter, the voltage V0 returns and saturates. That is, when the solenoid valve 17 moves normally, a dip portion T occurs. On the other hand, when the plunger 62 is locked for some reason, the detected voltage V0 monotonically increases with time and saturates without a drop. Therefore, depending on the presence or absence of the depression, the solenoid valve 1
It can be determined whether or not 7 is locked.

FIGS. 5 to 8 show an outline of a process for judging abnormality of the solenoid valve in the drive circuit 30 of this embodiment.
First, as shown in FIG.
Is output from the microcomputer 32,
In step 72, the second judging section 39 judges whether or not there is a lock. In step 73, the first judging section 38 judges open and short. In the second judgment unit 39,
Based on the above-described phenomenon, the presence or absence of the lock is determined according to the procedure shown in FIG. First, in step 85, an initial process such as clearing a flag is performed. Next, at step 86, it is determined whether there is a drop.

For this determination, an algorithm as shown in FIG. 7 can be used. First, step 1
In step 11, the sampled voltage data V0 becomes the maximum value V
It is determined whether it is smaller than max. If the voltage data V0 is not smaller than the maximum value Vmax, step 114
Then, the maximum value update unit 41 of the second determination unit 39 updates the maximum value Vmax by replacing the maximum value Vmax with the sampled voltage data V0. If the voltage data V0 is smaller than the maximum value Vmax, in step 112, the voltage judgment section 42 judges whether or not the difference is larger than the judgment value Va. If the difference is larger than the judgment value Va, in step 113 It is determined that there is a valid drop portion T. As described above, while the maximum value Vmax is updated, the difference is determined by comparing the sampled voltage V0 with the sampled voltage V0, thereby absorbing the difference in the condition of the voltage applied to the solenoid valve and the condition due to the resistance of the solenoid valve. , It is possible to accurately determine the drop. In addition, not only is the sampled voltage V0 smaller than the maximum value Vmax, but also if the difference is greater than or equal to a predetermined value, it is determined whether or not there is a drop. Can be prevented. Therefore, the presence / absence of a stable drop can be accurately determined by this algorithm.

For example, FIG. 9 shows that the voltage is 10 V (FIG.
(A)), 12V (FIG. 9 (b)) and 16V (FIG.
The state where the sampled voltage V0 increases in the case of (c)) is shown. However, the voltage V0 sampled by the voltage applied to the solenoid valve 17 increases, and the tendency to drop changes. However, when the plunger 62 moves normally, a depression T always occurs, and the depression T
Is about 40 mV or more. Therefore,
By the above algorithm, the drop of the voltage V0 can be detected by comparing the sampled voltage V0 while updating the maximum value Vmax, and furthermore, the judgment value Va of the difference from the maximum value Vmax is about 30 to 40 mV. , It is possible to reliably determine whether or not a significant drop has occurred.

If there is a valid drop in step 86 in FIG. 4, a normal flag is set in step 87 assuming that the plunger 62 is in a normal state, and in step 89, the elapsed time determination unit 43 determines whether the determination time Ta has elapsed. Determine whether or not. Until the determination time Ta is reached, the flow returns to step 86 to continuously check whether there is a drop. As shown in FIG. 9, when the plunger 62 moves normally,
A drop is observed within a range of about 10 ms at most after the ON signal φ1 is output. So, for example,
By setting the slightly longer time of about 14 ms as the determination time Ta, the confirmation of the presence or absence of the drop can be completed.

When the determination time Ta has elapsed, step 91 is executed.
To check the normal flag. If the normal flag is set, it is determined in step 92 that the plunger 62 of the solenoid valve 17 is in a normal state, and if the normal flag is not set,
In step 93, it is determined that the plunger 62 is locked. Then, in step 94, the number of times that the number of times determined to be locked by the number-of-times determination unit 44 is equal to the determination value Wa.
It is determined whether the number is larger. In the air massage device 1 of the present embodiment, the solenoid valve 17 is repeatedly turned on and off in order to repeatedly inflate and contract the airbag 15 as described above. Therefore, the signal φ for turning on the solenoid valve 17
Each time the scheduler 37 outputs "1", it is possible to determine the presence / absence of a lock according to the procedure shown in FIGS. Therefore, in the second determination unit 39 of this example, when the determination that the lock is performed is repeated a predetermined number of times Wa each time the ON signal φ1 is output, that is, the determination is performed a predetermined number of times Wa. Is determined, it is determined that the solenoid valve 17 is locked. Then, in step 95, processing at the time of abnormality such as turning on or blinking the LED 28 with an error is performed. Further, if necessary, the pump 16 is stopped to stop the movement of the air massage device 1.

FIG. 8 is a flowchart showing an outline of a process of detecting whether the coil 66 of the solenoid valve 17 is open or short in the first judging section 38. After the second judging unit 39 confirms the presence or absence of the lock, after a lapse of time sufficient for the sampled voltage V0 to stabilize, in Step 123, the sampled voltage data V0 and the short-circuit judgment value Hs are compared. If the compared voltage data V0 is larger than the determination value Hs,
It is assumed that the coil or wiring of the solenoid valve is short-circuited, and a process at the time of abnormality such as outputting a warning indicating that the short-circuit is performed in step 127 is performed. On the other hand, if the voltage data V0 sampled in step 124 is smaller than the open determination value Ho, it is assumed that the coil or wiring of the solenoid valve is disconnected, and a warning indicating open is output in step 126. Perform processing when an error occurs. Also in the processing at the time of these abnormalities, if necessary, the pump 16 is stopped and the movement itself of the air massage device 1 is stopped.

If the sampled voltage V0 is smaller than the short-circuit judgment value Hs and larger than the open judgment value Ho, a current I0 in a normal range is flowing through the solenoid valve 17, and in Step 125, the solenoid valves 17 and Assuming that the wiring is normal, the air massage device 1 is operated as usual.

As described above, in the solenoid valve drive circuit 30 of the present embodiment, the current I0 flowing through the solenoid valve 17 is converted into the voltage V0 and can be processed by the microcomputer 32, and the plunger 62 is locked when the solenoid valve 17 is turned on. The processing is performed by the function of the microcomputer 32 by making a determination based on the voltage drop at the time of execution. Further, the open / short of the coil 66 of the solenoid valve can be determined by comparing with the determination value, so that these can also be processed by the function of the microcomputer 32. Therefore, the drive circuit 30 of the present example has a simple configuration by installing the resistor R2 for current detection in the switching circuit of the solenoid valve 17, converting the current into a voltage, and taking the voltage into the microcomputer 32. An abnormality of the solenoid valve such as open / short of the coil can be comprehensively determined. For this reason, it is possible to provide the drive circuit 30 having a function of diagnosing abnormality of the solenoid valve at low cost, and to provide the air massage device 1 including the controller 21 having a function of diagnosing abnormality of the solenoid valve. can do.

Therefore, when a trouble occurs due to the inoperability of the solenoid valve, for example, when the airbag 15 does not contract, if there is any abnormality, the function as the air massage device 1 is stopped and In addition, it is possible to promptly notify the user or maintenance staff of the location of the abnormality. For this reason, the user can know where the cause of the non-operation of the air massage device 1 is, and it is possible to prevent unnecessary complaints and improve the value as a product. In addition, since the presence or absence of an abnormality can be detected at an early stage, it is possible to provide a safer air massage device.

In the above, in the second judgment section,
The solenoid valve is determined to be in a locked state after being determined to be locked a plurality of times, and processing for an abnormality is performed. However, once the locked state is detected, it is determined that the state is abnormal immediately. Processing such as outputting an alarm or stopping the massage device may be performed. However,
In the case of a massage device, turning on and off is repeated in a relatively short period of time, so even if it is determined that the lock state is abnormal multiple times after it has been determined that the lock state has been reached, the determination may affect safety and durability of the equipment. There is no delay as far as it will. Also,
By judging that the lock state is abnormal after detecting the lock state a plurality of times, there is no erroneous detection or the safety of the massage device is affected, but the plunger does not move by accident for one or several times for some reason. Sometimes, it is possible to prevent the massage device from inadvertently detecting an abnormality and stopping. Therefore, it is possible to provide an air massage device that can reliably detect an abnormality and has high reliability, and at the same time, can use the air massage device without any careless stoppage.

Furthermore, in the above description, the first determination unit samples the voltage or current after the solenoid valve is turned on, and determines whether a short circuit or an open circuit has occurred.
It is possible to detect an abnormality of the transistor switch Tr1 for driving the solenoid valve by the voltage or the current when the solenoid valve is off. Therefore, it is also useful to provide the microcomputer 32 with a function of sampling the voltage or current when the solenoid valve is turned on and judging an abnormality.

In the present embodiment, an air massaging device mounted on a vehicle is described as an example. However, the present invention is not limited to this, and a massaging device usable in an office, other air massaging devices, and a solenoid valve may be used. The present invention can be applied to other uses where on and off are repeated.

[0035]

As described above, in the solenoid valve driving device according to the present invention, the change in current when the solenoid valve is turned on is converted into a voltage and taken into the microcomputer to determine whether the solenoid valve is locked. In addition to the determination, the open / short of the solenoid valve is also determined, so that the abnormality of the solenoid valve can be comprehensively determined. Further, since the air massage device repeatedly expands and contracts, it is determined that the abnormality is detected after detecting whether or not the solenoid valve is locked a plurality of times. Therefore, an electromagnetic valve driving device which is easy to use and can reliably detect abnormality of the solenoid valve and has high reliability, while being able to use the solenoid valve without inadvertent stoppage, and an air massage using the same. A device can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of an air massage device according to the present invention.

FIG. 2 is a diagram showing an electrical connection of the air massage device shown in FIG.

FIG. 3 is a diagram schematically illustrating a drive circuit of the solenoid valve according to the present embodiment.

FIG. 4 shows the change in sampled voltage when the plunger moves normally and when it is locked and does not move.

FIG. 5 is a flowchart of a process for diagnosing an abnormality of a solenoid valve in the drive circuit of the present example.

FIG. 6 is a schematic flowchart of a process for determining lock of a plunger.

FIG. 7 is a schematic flowchart of a process of determining a voltage drop.

FIG. 8 is a schematic flowchart of a process for determining whether an electromagnetic valve is open or short.

FIG. 9 is a diagram showing that a change in a sampled voltage varies according to a voltage applied to the solenoid valve.

FIG. 10 is a view schematically showing a conventional air massage device.

FIG. 11 is a schematic sectional view of a DC type solenoid valve;
(A) is a cross section showing a state when the solenoid valve is on,
(B) is a cross section showing a state when the solenoid valve is off.

FIG. 12 is a view schematically showing a conventional drive device for a solenoid valve.

FIG. 13 is a time chart showing a timing of operating an air pump and a solenoid valve in the air massage device.

[Explanation of symbols]

 Reference Signs List 1 air massage device 3 seat 16 air pump 17 solenoid valve 21 controller 30 solenoid valve drive circuit 32 microcomputer 33 memory 36 sampling unit 37 scheduler 38 first judgment unit 39 second judgment unit 40 notification unit R2 converts current to voltage Resistance to detect the voltage drop of the sampled voltage

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) F16K 37/00 F16K 37/00 FF Term (Reference) 3H064 AA01 BA05 BA06 CA08 DA06 DB01 3H065 AA01 BA01 BB11 BC10 CA03 CA06 3H106 DA08 DA12 DA23 DB02 DB23 DB32 DC02 DD03 EE09 EE27 EE28 EE42 EE45 FA07 FB08 FB27 KK04 4C100 AD01 BA01 BA03 BB05 BC14 CA03 DA05 DA06

Claims (11)

[Claims] 1. A drive device for an electromagnetic valve in which a mover reciprocates according to on / off of DC power, a switching means for turning on / off the DC power, and voltage conversion for converting a current flowing through the electromagnetic valve into a voltage. Means, when the switching means is on and / or off, first determining means for comparing the voltage with a predetermined value or range to determine whether the solenoid valve is open or short; A second judging means for judging the lock of the mover based on a drop in the voltage when the solenoid is turned on. 2. The drive device for an electromagnetic valve according to claim 1, further comprising a microcomputer functioning as the first and second determination units. 3. The electromagnetic valve driving device according to claim 1, wherein the voltage conversion unit includes a resistor connected in series to the switching unit. 4. The apparatus according to claim 1, wherein said second judging means judges that said mover is locked when said voltage drop is not continuous when said switching means is turned on a plurality of times. The driving device of the solenoid valve. 5. The method according to claim 1, wherein the second determining means samples the voltage at predetermined intervals to determine a maximum value, and the sampled voltage is lower than the maximum value, and Means for judging that the voltage has dropped when the difference is equal to or greater than a predetermined value. 6. The electromagnetic valve driving device according to claim 1, further comprising a notification unit that outputs a result of the determination by the first and / or the second determination unit. 7. An electromagnetic valve driving device according to claim 1, an electromagnetic valve driven by the electromagnetic valve driving device, and intake and / or exhaust air being controlled by the electromagnetic valve. , An airbag that repeats inflation and deflation. 8. A control method of a drive device for an electromagnetic valve in which DC power is turned on / off by a switching means and a mover reciprocates in response thereto, wherein the electromagnetic means is provided when the switching means is on and / or off. A first determining step of comparing the current flowing through the valve or a voltage obtained by converting the current with a predetermined value or range to determine whether the solenoid valve is open or short; and the current or voltage when the switching means is turned on. And a second determining step of determining the lock of the mover due to a fall of the control valve. 9. The method according to claim 8, wherein in the second determining step, the movable element is locked when the current or voltage does not drop continuously when the switching means is turned on a plurality of times. A method for controlling an electromagnetic valve driving device, comprising: 10. The method according to claim 8, wherein the second determining step includes a step of sampling the current or the voltage at a predetermined interval to obtain a maximum value, and the step of determining that the sampled current or voltage is lower than the maximum value. Determining that the current or voltage has dropped when the difference from the maximum value is equal to or greater than a predetermined value. 11. A control program for a driving device of an electromagnetic valve in which a DC power is turned on / off by a switching means and a mover reciprocates in response to the DC power, wherein when the switching means is on and / or off, A first determining step of comparing the current flowing through the valve or a voltage obtained by converting the current with a predetermined value or range to determine whether the solenoid valve is open or short; and the current or voltage when the switching means is turned on. And a second determining step of determining the lock of the mover due to a fall in the control program of the solenoid valve driving device.