JP3181030B2 - Solenoid operating state detecting device and operating state detecting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating state detecting device and operating state detecting method for a solenoid, and more particularly, to operating an opening / closing valve and a switching valve to maintain the operating state. The present invention relates to a solenoid operating state detecting device and an operating state detecting method for detecting an operating state of a solenoid such as a latching solenoid.

[0002]

2. Description of the Related Art Generally, when an on-off valve or a switching valve is operated, a solenoid driving circuit drives a latching solenoid by supplying a driving current to the latching solenoid according to an input of an on-off control signal or a switching control signal. The valve is operated by driving a latching solenoid.

In such a case, input of a control signal,
Since the operation is independent of the actual operation of the valve, an abnormal operation state occurs such that the valve does not operate at all even if the control signal is input, or the valve stops halfway. Therefore, it is necessary to confirm whether or not the valve operation has been reliably performed by inputting the control signal.

Therefore, in a conventional operating state detecting device for a solenoid, a reed switch is installed in a leakage magnetic flux generated by a latching solenoid, and the fact that the leakage magnetic flux is different depending on the operating state of the latching solenoid is used to operate the valve. Had been confirmed.

More specifically, a reed switch is turned on / off by a different leakage magnetic flux corresponding to the valve operating state, and an answerback signal indicating the operating state of the latching solenoid based on the on / off state of the reed switch. And the operating state of the solenoid is detected by monitoring the answerback signal.

However, in the above-described configuration of the conventional operating state detecting device for a solenoid, since the reed switch is driven on / off according to the magnitude of the leakage magnetic flux to generate an answer back signal, the contact piece of the reed switch is turned off. If there is a variation in the level of the separated magnetic flux, the operation state of the solenoid cannot be reliably answered back, so that it is necessary to finely adjust the installation position of the reed switch.

In particular, in the case of a solenoid for improving the efficiency, that is, the performance, the leakage magnetic flux is extremely reduced, so that the inaccuracy of the on / off operation of the reed switch described above becomes more remarkable. In addition, since the reed switch has mechanical contact pieces, there is also a problem that reliability is inferior, such as a high possibility of failure due to wear of the contact pieces.

In order to solve these problems, the applicant of the present application has proposed a solenoid operating state detecting device using a time constant of a solenoid and a resistor connected in series to the solenoid. FIG. 6 shows a circuit block diagram of a solenoid operation state detecting device proposed by the present applicant.

A valve driving circuit 52 is connected to both ends of a coil L of the latching solenoid 51, a resistor R1 and transistors Q11 and Q12 are connected in series to the power supply VCC, and a capacitor C1 is connected to the transistor Q12. They are connected in parallel. The output voltage of coil L is diode D
1 and D2 are input to an amplifier 53 via a limiter, and the output voltage is input to a comparator 54. The other input of the comparator 54 divided by the reference voltage VREF by a semi-fixed resistor R ₃ to the power supply VCC and the resistor R ₂ is applied.

The controller 55 operates in accordance with a predetermined program, outputs a valve closing control signal a or a valve opening control signal b to the valve driving circuit 52 in response to an external signal, and controls the transistors Q11 and Q12 to output signals to the transistors Q11 and Q12. In response to this, it outputs a detection request signal f. The detection request signal f is also input to the delay circuit 56, and the delay output is supplied to the clock input CK of the latch circuit 57 composed of a D flip-flop. Further, the output of the comparator 54 is supplied to the data input D of the latch circuit 57. And Q of the latch circuit 57
The output is input to the controller 55 as an answerback signal j, whereby the controller 55 determines the operating state of the valve.

Next, prior to describing the operation of the operating state detecting device for the solenoid, the principle of operation will be described with reference to FIG. FIG. 7 shows an example of the gas shut-off valve A. In FIG. 7, the gas shut-off valve A includes a latching solenoid 61,
Valve body 62 operated by latching solenoid 61
And a valve seat 6 having a valve hole 63 opened and closed by a valve body 62.
4.

The latching solenoid 61 comprises a coil L, a movable piece 65 and a magnet Mg, and the movable piece 65 is provided with a valve body 62 integrally therewith. When the valve body 62 is in contact with the valve seat 64, the valve hole 63 is closed and the gas shut-off valve A is in the valve closed state (right side in FIG. 7). When not in contact, the valve hole 63 is open and the valve is open ( 7 (left side in FIG. 7).

In the above configuration, when the DC valve opening current is applied to the coil L of the latching solenoid 61 when the valve body 62 is in the valve closed state in contact with the valve seat 64, the movable piece 65 is excited. You. When the direction of the valve opening current is set such that the excited magnetic pole of the movable piece 65 matches the magnetic pole of the magnet Mg, the movable piece 65 is connected to a spring (not shown) provided between the movable piece 65 and the magnet Mg. Magnet M against
g, and the valve body 62 is separated from the valve seat 64 to be in a valve-open state.

When a DC valve closing current in a direction opposite to the valve opening current is applied to the coil L from the valve open state, the movable piece 65 is excited so as to be a magnetic pole in a direction to decrease the magnetic force of the magnet Mg. The movable piece 6 that has been attracted to the magnet Mg by the force of the spring between the movable piece 65 and the magnet Mg
5 moves to the valve hole 63 side, and the valve body 62 comes into contact with the valve seat 64 to be in a valve closed state.

When the latching solenoid 61 shifts from the valve opening state to the valve closing state or from the valve closing state to the valve opening state, a valve closing driving current or a valve opening driving current flows through the coil L for a predetermined period, and thereafter the driving current Even if it is no longer flushed, the valve 6
2 can be maintained (latched) in that state.

Here, considering the inductance of the coil L of the latching solenoid 61, for example, when the magnetic coupling between the movable piece 65 and the coil L when the valve is closed is larger than the magnetic coupling when the valve is open. In
Since the magnetic flux when the valve is closed is greater than the magnetic flux when the valve is open, the inductance of the coil L when the valve is closed is greater than the inductance when the valve is open.

Note that which of the magnetic flux when the valve is closed and the magnetic flux when the valve is opened differs depending on the inductance of the solenoid and the state of the magnetic circuit. Next, the operation of the above-described conventional operation state detecting device for a solenoid will be described with reference to the operation flowcharts of FIGS. 6 and 8 and the waveform diagram of FIG.

The controller 55 outputs a valve closing control signal (see FIG. 9A) or a valve opening control signal (see FIG. 9B) to the drive circuit 52 (step S11). In this case, which control signal is output is determined by the controller 55 based on a signal input from the outside.

If the gas shutoff valve A is in the valve open state and the controller 55 outputs a valve closing control signal (see FIG. 9A), the valve closing control signal output by the controller 55 is It is input to the drive circuit 52. In response to the input of the valve closing control signal, the valve drive circuit 52 sets the output terminal c to the H level and the output terminal d to the L level, and switches the coil L of the latching solenoid 61 from the output terminal c to the output terminal d. In the direction, the DC valve closing drive current (see FIG. 9)
(See (c)). As a result, the movable piece 65 is driven as described above, and the gas shutoff valve A is closed (see FIG. 9E).

Next, the controller 55 outputs a detection request signal for a predetermined time, as shown in FIG.
12) Turn on the transistors Q11 and Q12. As a result, a detection voltage is applied to the coil L from the power supply VCC, the output voltage of the coil L is amplified by the amplifier 53, and the amplified output (see FIG. 9G) is input to the comparator 4.

The output of the amplifier 53 falls due to the inductance of the coil L and the time constant of the resistor R1. Therefore, the comparator 4 compares the voltage of the coil L with a reference voltage,
In a period t11 when the voltage of the coil L is higher than the reference voltage, the output of the comparator 4 is inverted to "H" level (FIG. 9).
(See (h)), and is input to the data input D of the latch circuit 57.

On the other hand, the detection request signal is delayed by a predetermined time t0 by the delay circuit 6 (see FIG. 9 (i)), and the latch circuit 5
7 clock input CK. The latch circuit 57 outputs the comparator output supplied to the data input D (FIG. 9).
(H)) and the delay output (see FIG. 9 (i)) supplied to the clock input CK determines the level of the data output Q.

That is, in the case of the above example, the shutoff valve A
When the valve is closed, the inductance of the coil L is larger than the inductance when the valve is opened. Accordingly, the falling time constant when the detection request signal is supplied is larger when the valve is closed than when the valve is opened. As shown in FIG. 9 (g), the output current of the coil L is smaller when the valve is closed. 9 flows for a longer time than when the valve is opened, the output of the comparator 54 also changes as shown in FIG.
As shown in (h), the "H" level period t11 is longer when the valve is closed.

On the other hand, the output from the delay circuit 6 is delayed by a predetermined time t0 from the detection request signal as shown in FIG. 9 (i) regardless of whether the valve is open or closed. That is, the answer back signal is as shown in FIG.
As shown in FIG. 5, when t11> t0 (when the valve is changed from the valve open state to the valve closed state), the level becomes “H”. When t11 <t0 (when the state changes from the valve close state to the valve open state), the “H” level is set. L level.

Therefore, the controller 55 reads the answer back signal (step S13) and determines the operating state of the valve (step S14).

[0026]

As described above, in the conventional operating state detecting device for a solenoid, the time constant determined by the coil L and the resistor R1 connected in series with the coil L is used to open the valve. Although the closed state was detected, the inductance of the gas shutoff valve changes depending on the inductance of the coil L and the configuration of the magnetic circuit.
There is a possibility that the logic of the answerback signal j may be inverted, and there is a problem that the operation state detecting device of one solenoid cannot be applied to all the shutoff valves.

Therefore, an object of the present invention is to provide a solenoid operating state detecting device and an operating state detecting apparatus capable of detecting the operating state of the solenoid regardless of the configuration of the coil L and the magnetic circuit, that is, regardless of the type of the gas shutoff valve. It is to provide a detection method.

[0028]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, the movable piece of the solenoid is moved to the first position.
An operation of a solenoid for detecting an operation state of the solenoid after flowing a first drive current for driving from a state to a second state or a second drive current for driving from the second state to the first state through the coil of the solenoid; In the state detection device, detection signal output means for supplying a detection signal to the coil of the solenoid based on a detection control signal input from the outside, and the detection signal is generated at both ends of the coil of the solenoid when the detection signal is supplied. A comparison unit that compares a voltage with a reference voltage and outputs a comparison result signal; and a signal holding unit that captures and holds the comparison result signal at a timing based on a timing signal input from the outside, holds the signal, and outputs the signal as a holding comparison result signal. Inverting the signal logic of the holding comparison result signal based on an operation mode control signal input from the outside,
Alternatively, a logic control output unit that outputs a state detection signal without inversion is provided.

According to the first aspect of the present invention, the detection signal output means of the operating state detection device for the solenoid sends a detection signal to the coil of the solenoid based on a detection control signal input from the outside. In parallel with this, the comparing means compares the voltage generated at both ends of the coil of the solenoid when the detection signal flows with the reference voltage, and outputs a comparison result signal to the signal holding means.

The signal holding means fetches and holds the comparison result signal at a timing based on a timing signal input from the outside, and outputs the signal to the logic control output means as a holding comparison result signal. The logic control output means inverts the signal logic of the hold comparison result signal based on an operation mode control signal input from the outside, or outputs the signal as a state detection signal without inversion.

According to a second aspect of the present invention, in the first aspect of the present invention, a detection control means for outputting the detection control signal so as to supply a detection signal to the coil of the solenoid is provided. According to the second aspect of the invention, in addition to the function of the first aspect, the detection control means outputs a detection control signal to the detection signal output means so as to pass a detection signal to the solenoid coil.

According to a third aspect of the present invention, in the first or second aspect of the present invention, an operation mode switching means for outputting the operation mode control signal is provided in accordance with the type of the solenoid. According to the invention described in claim 3,
In addition to the effect of the invention described in claim 1 or 2, the operation mode switching means outputs an operation mode control signal to the logic control output means according to the type of the solenoid.

According to a fourth aspect of the present invention, there is provided the solenoid of the first to third aspects, further comprising timing signal generating means for outputting the timing signal based on the detection control signal. According to the fourth aspect of the invention, in addition to the operation of the solenoid of the first to third aspects, the timing signal generating means outputs a timing signal to the signal holding means based on the detection control signal. .

According to a fifth aspect of the present invention, in accordance with the first to fourth aspects of the present invention, there is provided a state determining means for determining an operation state of the solenoid based on the state detection signal. According to the invention described in claim 5, claim 1 is provided.
In addition to the functions of the invention, the state determining means determines the operating state of the solenoid based on the state detection signal.

According to a sixth aspect of the present invention, the first drive current for driving the movable piece of the solenoid from the first state to the second state or the second drive current for driving the movable piece from the second state to the first state is provided by the solenoid. After flowing through the coil, in the operating state detection method of the solenoid to detect the operating state of the solenoid, a detection signal output step of sending a detection signal to the coil of the solenoid based on detection control from the outside,
A comparison step of comparing a voltage generated at both ends of the coil of the solenoid when the detection signal flows and a reference voltage, a comparison result holding step of capturing and holding the comparison result at a predetermined timing, and According to the invention described in claim 6, based on the operation mode control, the detection signal output step sends a detection signal to the solenoid coil based on detection control from the outside.

In the comparison step, a voltage generated at both ends of the solenoid coil when the detection signal is supplied is compared with a reference voltage. The comparison result holding step captures and holds the comparison result in the comparison step at a predetermined timing.

The logic control step controls the inversion / non-inversion of the logic of the held comparison result based on external operation mode control. / A logic control step of controlling non-inversion. The invention according to claim 7 is the invention according to claim 6, comprising a detection control step of performing control so that a detection signal flows through the coil of the solenoid.

According to the seventh aspect of the invention, in addition to the operation of the sixth aspect of the invention, the detection control step performs control so that a detection signal is supplied to the solenoid coil. Claim 8
According to a sixth aspect of the present invention, there is provided an operation mode switching step of performing the operation mode control according to a type of the solenoid.

According to the invention described in claim 8, in addition to the effect of the invention described in claim 6 or 7, the operation mode switching step performs operation mode control according to the type of the solenoid. A ninth aspect of the present invention is the invention according to the sixth to eighth aspects, further comprising a timing control step of controlling the predetermined timing based on the detection control.

According to the ninth aspect of the invention, in addition to the functions of the sixth to eighth aspects, the timing control step controls a predetermined timing based on the detection control in the detection control step. . The invention according to claim 10 is
The invention according to any one of claims 6 to 9, further comprising a state determining step of determining an operating state of the solenoid based on the hold comparison result after the logical control step.

According to the tenth aspect, the sixth aspect is provided.
In addition to the operation of the invention, the state determining step determines the operating state of the solenoid based on the holding comparison result after the logical control step.

[0042]

Preferred embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows a schematic block diagram of a solenoid operation state detecting device according to an embodiment.

A solenoid operating state detecting device 1 comprises a valve driving circuit 2 connected to both ends of a coil L of a latching solenoid, and a resistor R connected in series to one end of the coil L.
And a transistor Q1 connected between the other end of the resistor R and the power supply VCC, and a transistor Q2 connected between the other end of the coil L and the ground GND.

Also, a solenoid operating state detecting device 1
A reference voltage input terminal for inputting a reference voltage signal VREF corresponding to a reference voltage which is a voltage of the intermediate connection point is connected to an intermediate connection point between the resistor R and the coil L, and an intermediate connection point between the coil L and the transistor Q2. A discrimination voltage input terminal for inputting a discrimination target voltage signal VDS whose voltage level is to be discriminated is connected to the connection point, and a comparator 3 that outputs comparison result data DCPM, operates according to a predetermined program, and operates in accordance with an external signal. The valve opening / closing control signal V for the valve drive circuit 2
C, outputs a detection request signal DR to the transistors Q1, Q2 and a timer circuit 5, which will be described later; a timer circuit 5, which outputs a determination timing signal TM based on the detection request signal DR; 3 is input to the data input terminal D, the discrimination timing signal TM is input to the clock input terminal CK, and the signal level of the comparison result data DCPM at the timing corresponding to the discrimination timing signal TM is fetched. A flip-flop (F / F) circuit 6 for outputting the answer back data ANS1 from a data output terminal Q.

Further, a solenoid operating state detecting device 1
When the inductance (LOPEN) of the coil L when the valve is open is larger than the inductance (LCLOSE) of the coil L when the valve is closed, that is, when LOPEN> LCLOSE, the high potential side power supply (= VCC; “H” level) ), And when the inductance (LOPEN) of the coil L when the valve is open is smaller than the inductance (LCLOSE) of the coil L when the valve is closed, that is, when LOPEN <LCLOSE, the low-potential-side power supply (= GND; " L ”level), the solenoid operating state detection device 1
Mode switching signal S for switching the operation mode of
An operation mode changeover switch 7 for outputting EL, an original answer back data ANS1 is inputted to one input terminal, and an operation mode changeover signal SEL is inputted to the other input terminal;
Original answer back data ANS1 and operation mode switching signal S
The exclusive OR (EXO) of the exclusive OR of EL and output to the controller 4 as an answer back signal ANS
R) circuit 8.

Next, the operation of the solenoid operation state detecting device will be described with reference to the operation flowchart of FIG. 2 and the waveform diagrams of FIGS. First, the controller 4 outputs a valve opening / closing control signal VC to a valve drive circuit to perform valve opening / closing control (step S1).

In response to the input of the valve opening / closing control signal VC, the valve drive circuit 2 sets one output terminal to the “H” level and the other output terminal to the “L” level, and sets the output terminal to the coil L for a predetermined time. , And a DC current for valve closing drive is supplied. As a result, FIG.
As shown in (5), the movable piece 65 is driven, and the gas shut-off valve A enters the valve open state or the valve closed state.

Next, as shown in FIG. 3A, the controller 4 sets the detection request signal DR to the "H" level at the time t1, and outputs this "H" level detection request signal DR for a predetermined time (step S1). S2) Since the transistor Q1 is turned on and the transistor Q2 is turned off, the reference voltage signal VREF becomes "H" level (see FIG. 3B).
The signal is input to the reference voltage input terminal (+) of the comparator 3.

On the other hand, a detection voltage is applied to the coil L from the power supply VCC, and a voltage signal VDS to be determined (see FIG. 3C), which is an output voltage of the coil L, is applied to a determination voltage input terminal (-) of the comparator 3. Is entered. As a result, the comparator 3 compares the reference voltage signal VREF with the determination target voltage signal VDS, and outputs the comparison result to the data input terminal D of the flip-flop circuit 6 as comparison result data DCMP (step S3). .

The comparison result data DC of the comparator 3
In parallel with the output operation of MP, the timer circuit 5 outputs the determination timing signal TM to the flip-flop circuit clock input terminal CK as the “H” level for a predetermined time ΔT (step S4). The flip-flop circuit 6, to which the comparison result data DCPM and the discrimination timing signal TM have been input, takes in the signal level of the comparison result data DCPM at the falling edge of the discrimination timing signal TM, and generates an exclusive OR circuit 8 as the original answer back data ANS1. (Step S5).

Next, the operation of the exclusive OR circuit 8 will be described.
When the inductance of the coil L when the valve is open (LOPEN) is larger than the inductance of the coil L when the valve is closed (LCLOSE) and when the valve L is open (LOPEN)
The operation will be described separately for the case where is smaller than the inductance (LCLOSE) of the coil L when the valve is closed.

1) In the case of LOPEN> LCLOSE In this case, it is necessary to connect the operation mode changeover switch to the high potential side power supply (= VCC), and as a result, the operation mode changeover signal SEL becomes "H" level. It is assumed that

When the inductance of the coil L satisfies LOPEN> LCLOSE, the time constant caused by the resistance R and the inductance of the coil L increases when the valve is opened and decreases when the valve is closed.

1-1) Operation at the time of valve opening Therefore, at the time of valve opening, as shown by a solid line in FIG.
The falling edge of the voltage signal VDS to be determined becomes gentle,
At the falling timing of the determination timing signal TM,
Still at "H" level (that is, VDS> reference voltage signal VRE)
(A determination voltage corresponding to F).

As a result, the comparison result data DCPM output from the comparator 3 becomes "L" level. The comparison result data DCPM at the “L” level is a flip-flop.
The flip-flop circuit 6
Holds the "L" level original answer back signal ANS1 and outputs it to the exclusive OR circuit 8 via the data output terminal Q.

At this time, since the operation mode switching signal SEL, which is the other input of the exclusive OR circuit 8, is at "H" level, the answerback signal ANS is at "H" level (step S6). The controller 4 can determine that the solenoid, that is, the shutoff valve is in the open state (step S7).

1-2) Operation when Valve is Closed On the other hand, when the valve is closed, as shown by the dashed line in FIG. 3C, the fall of the determination target voltage signal VDS becomes sharp, and the fall of the determination timing signal TM. At the timing of "L" level (that is, VDS <reference voltage signal VREF).
(A judgment voltage corresponding to the above).

As a result, the comparison result data DCPM output from the comparator 3 becomes "H" level. This “H” level comparison result data DCPM is
The flip-flop circuit 6
Holds the original answerback signal ANS1 at "H" level and outputs it to the exclusive OR circuit 8 via the data output terminal Q.

At this time, since the operation mode switching signal SEL, which is the other input of the exclusive OR circuit 8, is at the "H" level, the answer back signal ANS is at the "L" level (step S6). The controller 4 can determine that the solenoid, that is, the shutoff valve is in the closed state (step S7).

2) In the case of LOPEN <LCLOSE In this case, it is necessary to connect the operation mode changeover switch to the low potential side power supply (= GND).
It is assumed that the operation mode switching signal SEL is at “L” level.

When the inductance of the coil L is LOPEN <LCLOSE, the time constant caused by the resistance R and the inductance of the coil L decreases when the valve is opened and increases when the valve is closed.

2-1) Operation at the time of valve opening Therefore, at the time of valve opening, as shown by a broken line in FIG.
The fall of the determination target voltage signal VDS becomes sharp, and at the fall timing of the determination timing signal TM, the signal has already been at the “L” level (that is, VDS <reference voltage signal VRE)
(A determination voltage corresponding to F).

As a result, the comparison result data DCPM output from the comparator 3 becomes "H" level. This “H” level comparison result data DCPM is
The flip-flop circuit 6
Holds the "H" level original answer back signal ANS1 and outputs it to the exclusive OR circuit 8 via the data output terminal Q.

At this time, since the operation mode switching signal SEL, which is the other input of the exclusive OR circuit 8, is at "L" level, the answer back signal ANS is at "H" level (step S6). The controller 4 can determine that the solenoid, that is, the shutoff valve is in the open state (step S7).

2-2) Operation when Valve is Closed On the other hand, when the valve is closed, as shown by the solid line in FIG. 4C, the signal falling of the determination target voltage signal VDS becomes gentle, and the falling of the determination timing signal TM falls. At the timing of "H" level (that is, VDS> reference voltage signal VREF)
(A judgment voltage corresponding to the above).

As a result, the comparison result data DCPM output from the comparator 3 becomes "L" level. The comparison result data DCPM at the “L” level is a flip-flop.
The flip-flop circuit 6
Holds the "L" level original answer back signal ANS1 and outputs it to the exclusive OR circuit 8 via the data output terminal Q.

At this time, since the operation mode switching signal SEL, which is the other input of the exclusive OR circuit 8, is at the "L" level, the answer back signal ANS is at the "L" level (step S6). The controller 4 can determine that the valve is in the closed state (Step S).
7).

As described above, when the inductance (LOPEN) of the coil L when the valve is open is larger than the inductance (LCLOSE) of the coil L when the valve is closed, and when the inductance (LOPEN) of the coil L when the valve is open. Coil L when valve is closed
In this case, the answer back signal ANS in the controller 4 becomes “H” level when the valve is opened and “L” level when the valve is closed, regardless of the type of gas shut-off valve. It is constant and the operating state detection device for the solenoid can be shared regardless of the type of gas shut-off valve, and there is no need to change the control program of the controller.

In the above embodiment, the controller 4 and the comparator 3, the timer circuit 5, the flip-flop circuit 6, the operation mode switch 7 and the exclusive OR circuit 8 are provided separately. As shown in FIG. 5, in addition to the function of the controller 4, the functions of the comparator 3, the timer circuit 5, the flip-flop circuit 6, the operation mode changeover switch 7, and the exclusive OR circuit 8 are realized by an external setting. It is also possible to provide a controller 4A that can be provided.

Further, as shown in FIG.
It is also possible to output a resistance value control signal CR to A and provide a variable resistance circuit R ′ that can be controlled by program control. Thus, it is possible to make the operating state detection device of the solenoid correspond to more types of solenoid coils.

[0071]

According to the first aspect of the present invention, the detection signal output means of the operating state detection device for the solenoid sends a detection signal to the coil of the solenoid based on a detection control signal input from the outside.

In parallel with this, the comparing means compares the voltage generated at both ends of the solenoid coil when the detection signal flows with the reference voltage, and outputs a comparison result signal to the signal holding means. Captures and holds a comparison result signal at a timing based on a timing signal input from the outside, and outputs it as a holding comparison result signal to the logic control output means. The logic control output means outputs the operation mode control signal input from the outside. Inverts the signal logic of the hold comparison result signal or outputs it as a state detection signal without inversion, regardless of the type of solenoid coil or the magnetic circuit that drives the solenoid coil. Can be kept constant, and the operating state of the solenoid, that is, the open / closed state of the shut-off valve can be easily grasped.

According to the second aspect of the present invention, in addition to the function of the first aspect, the detection control means outputs a detection control signal to the detection signal output means so as to pass a detection signal to the solenoid coil. Therefore, the operating state of the solenoid can be grasped at a suitable timing after the solenoid (shutoff valve) is driven.

According to the third aspect of the present invention, in addition to the function of the first or second aspect, the operation mode switching means outputs an operation mode control signal according to the type of the solenoid by logical control output. Since the signal is output to the means, the logic of the state detection signal can be made constant regardless of the type of the solenoid.

According to the fourth aspect of the present invention, in addition to the operation of the solenoid of the first to third aspects, the timing signal generating means holds the timing signal based on the detection control signal. , The comparison result signal can be held at a timing suitable for determining the operating state of the solenoid, and the operating state of the solenoid can be accurately determined.

According to the fifth aspect of the present invention, in addition to the functions of the first to fourth aspects, the state determining means determines the operating state of the solenoid based on the state detection signal. It is possible to accurately determine the operation state at a suitable timing after the drive of the above.

According to the sixth aspect of the present invention, in the detection signal output step, the detection signal is supplied to the solenoid coil based on detection control from the outside, and the comparison step is performed when the detection signal is supplied. The voltage generated at both ends of the coil is compared with a reference voltage, the comparison result holding step captures and holds the comparison result in the comparison step at a predetermined timing, and holds the logic result.The logic control step is based on an external operation mode control. Since the inversion / non-inversion of the logic of the hold comparison result is controlled, the logic of the state detection signal can be constant regardless of the type of the solenoid coil or the magnetic circuit driving the solenoid coil, and the operating state of the solenoid, That is, since the open / closed state of the shut-off valve can be easily grasped,
Regardless of the type of solenoid, the logic of the state detection signal can be made constant.

According to the seventh aspect of the present invention, in addition to the operation of the sixth aspect of the present invention, the detection control step performs control so that a detection signal is supplied to the solenoid coil. The operation state of the solenoid can be grasped at a suitable timing after the driving.

According to the eighth aspect of the invention, in addition to the operation of the sixth or seventh aspect, the operation mode switching step performs the operation mode control in accordance with the type of the solenoid. Irrespective of the type, the logic of the state detection signal can be made constant.

According to the ninth aspect of the present invention, in addition to the effects of the sixth to eighth aspects, the timing control step controls a predetermined timing based on the detection control in the detection control step. Therefore, the comparison result signal can be held at a timing suitable for determining the operating state of the solenoid, and the operating state of the solenoid can be accurately determined.

According to the tenth aspect, the sixth aspect is provided.
In addition to the operation of the invention described in claim 9, in the state determining step, the operating state of the solenoid is determined based on the holding comparison result after the logical control step, so that the operating state is determined at a suitable timing after driving the solenoid. It can be determined accurately.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a solenoid operation state detection device according to an embodiment.

FIG. 2 is an operation flowchart of the embodiment.

FIG. 3 is an operation waveform diagram (part 1) of the embodiment.

FIG. 4 is an operation waveform diagram (part 2) of the embodiment.

FIG. 5 is an explanatory view of a modification of the embodiment.

FIG. 6 is a circuit block diagram of a conventional operation state detecting device for a solenoid.

FIG. 7 is an explanatory diagram of an operation state of a shutoff valve.

FIG. 8 is an operation flowchart of a conventional example.

FIG. 9 is an operation waveform diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operating state detection device of solenoid 2 Valve drive circuit 3 Comparator 4 Controller 5 Timer circuit 6 Flip-flop circuit 7 Operation mode changeover switch 8 Exclusive OR circuit ANS Answer back signal ANS1 Original answer back signal VC Valve opening / closing control signal DR detection Request signal VREF Reference voltage signal VDS Judgment target voltage signal DCPM Comparison result data TM Judgment timing signal

Claims (10)

(57) [Claims] The movable piece of the solenoid is moved from a first state to a second state.
A solenoid driving state detecting device for detecting the operating state of the solenoid after flowing the first driving current for driving to the state or the second driving current for driving from the second state to the first state through the coil of the solenoid; A detection signal output means for supplying a detection signal to the coil of the solenoid based on a detection control signal input from outside; a voltage and a reference voltage generated at both ends of the coil of the solenoid when the detection signal is supplied A comparison means for comparing and outputting a comparison result signal; a signal holding means for capturing and holding the comparison result signal at a timing based on a timing signal input from the outside; Based on the operation mode control signal thus obtained, the signal logic of the hold comparison result signal is inverted or the state is detected without being inverted. And a logic control output means for outputting the output signal as an output signal. 2. The operation of the solenoid according to claim 1, further comprising a detection control means for outputting the detection control signal so as to supply a detection signal to a coil of the solenoid. State detection device. 3. The operation state detecting device for a solenoid according to claim 1, further comprising an operation mode switching unit that outputs the operation mode control signal according to a type of the solenoid. Operating state detection device for solenoid. 4. The solenoid operating state detecting device according to claim 1, further comprising a timing signal generating means for outputting the timing signal based on the detection control signal. Operating state detection device. 5. The solenoid operating state detecting apparatus according to claim 1, further comprising: state determining means for determining the operating state of the solenoid based on the state detection signal. Operating state detection device. 6. A movable piece of a solenoid is moved from a first state to a second state.
A solenoid driving state detecting method for detecting the operating state of the solenoid after flowing a first driving current for driving to a state or a second driving current for driving from the second state to the first state through the coil of the solenoid; A detection signal output step of flowing a detection signal to the coil of the solenoid based on detection control from the outside, and comparing a voltage generated at both ends of the coil of the solenoid when the detection signal is passed with a reference voltage. A comparison step of capturing and holding the comparison result at a predetermined timing, and a logic control step of controlling inversion / non-inversion of the logic of the holding comparison result based on an external operation mode control. A method for detecting an operating state of a solenoid, comprising: 7. The solenoid operating state detection method according to claim 6, further comprising a detection control step of performing control so that a detection signal flows through a coil of the solenoid. 8. The solenoid operation state detecting method according to claim 6, further comprising an operation mode switching step of performing the operation mode control according to a type of the solenoid. Operating state detection method. 9. The operation of a solenoid according to claim 6, further comprising a timing control step of controlling said predetermined timing based on said detection control. State detection method. 10. The method for detecting an operating state of a solenoid according to claim 6, further comprising a state determining step of determining an operating state of the solenoid based on the holding comparison result after the logical control step. A method for detecting an operating state of a solenoid, characterized in that: