JP5444527B2 - Solenoid driving device, solenoid driving method and program - Google Patents

Description

The present invention relates to a solenoid driving device and the like, and in particular, when starting and operating a solenoid, the current required for starting and operating the solenoid is supplied to the solenoid, and when holding, a current required for holding is supplied. The solenoid driving apparatus, the solenoid driving method and the program are controlled in this way.

As is well known, the solenoid includes a fixed iron core made of a ferromagnetic material, a movable iron core, a coil wound around the fixed iron core, and a return spring for returning the movable iron core to its return position. Yes. When the coil is energized, a magnetic circuit is formed from the coil via the fixed iron core and the movable iron core. The generated magnetic attraction force attracts the movable iron core toward the fixed iron core against the spring force of the return spring. As long as energization of the coil is continued, the movable iron core is held at the suction position.

FIG. 9 shows the current supplied to the conventional solenoid (FIG. 9A), the attractive force (FIG. 9B), the solenoid inductance (FIG. 9C), and the duty ratio of the pulse voltage supplied to the solenoid. (FIG. 9D) is shown. Further, in the figure, the dotted line portion indicates a point where the shaft of the solenoid is attracted.

As can be seen from FIG. 9, in the conventional solenoid driving apparatus, the solenoid is driven while maintaining the duty ratio of the pulse voltage supplied to the solenoid even after the solenoid shaft is attracted.

For this reason, there is also known a technique in which power saving of the solenoid is one of the problems (see, for example, Patent Document 1).

The solenoid energization control circuit is configured as shown in FIG. That is, the energization control circuit 100 includes a current supply circuit that is formed by turning on the energization switch SW and supplies the first value of drive current to the coil 85. In addition, a determination circuit 101 is provided for determining that a predetermined time has elapsed since the start of energization by turning on the energization switch SW. The determination circuit 101 includes a comparator 102 and a capacitor 103. When the switch SW is turned on, a charging operation for the capacitor 103 is started, and the potential of the inverting input of the comparator 102 is held to be lower than the potential of the non-inverting input during a period until the capacitor 103 is fully charged. For this reason, the comparator output is held at a high logic level for a predetermined period immediately after the switch SW is turned on.

The energization control circuit 100 further includes a current limiting circuit 105 including an operational amplifier 104. In the current limiting circuit 105, while the comparator output is held at a high logic level, the first value of drive current is supplied as the energization current for the coil 85. For example, a current of 1.6 A is supplied. On the other hand, when the comparator output falls to a low logic level after the capacitor 103 is charged, the drive current (second value current) limited by the negative feedback resistance of the operational amplifier 104 is supplied to the coil 85. Is done. For example, a current of 80 mA is supplied.

As described above, in the solenoid 82 of this example, at the initial stage of energization, a large current is passed to generate a large magnetic attractive force, thereby attracting the plunger 86 at a distant position. After the plunger 86 is sucked, the coil 85 is energized with a small current necessary for maintaining the sucked state. Therefore, in the solenoid 82 of this example, a large value of current only needs to be supplied to the coil 85 when the plunger 86 is attracted. Therefore, a small solenoid 82 can be used. Further, power saving of the solenoid 82 can be achieved. Furthermore, since only a small current flows in the plunger suction state, the amount of heat generation is small, and the coil does not burn. Furthermore, since the calorific value is small, there is no adverse effect such as the optical axis deviation due to thermal deformation of surrounding optical elements.
JP 2000-173822 A

However, as described above, in the conventional solenoid driving device, after the solenoid shaft is attracted, it is driven while maintaining the duty ratio of the pulse voltage supplied to the solenoid. There was a problem of supplying excess power more than necessary to maintain.

Similarly, Patent Document 1 discloses a technique related to power saving in a solenoid driving device, but as shown in FIG. 10, there is a problem that the circuit configuration is complicated and the cost is increased.

Therefore, the present invention has been made in view of the above-described problems. When the solenoid is activated and operated with a simple circuit configuration, the current necessary for the activation and operation of the solenoid is supplied to the solenoid and held. It is an object of the present invention to provide a driving device, a solenoid driving method, and a program for controlling to supply a current necessary for holding.

The present invention proposes the following items in order to solve the above-described problems.

(1) The present invention is a solenoid driving apparatus for controlling a direct current supplied to a solenoid by controlling a duty ratio of a pulse voltage applied to the solenoid, and a direct current power source connected to an input of the solenoid When the DC voltage value applied to the solenoid is measured, a voltage value measurement means for storing the measured value, during the measurement of the DC voltage, the DC current supplied to the solenoid in a particular plurality of timing Current value measuring means for measuring the value and storing the measured value, calculating means for calculating the inductance value of the solenoid or a value proportional to the inductance value from the stored measured value, and the calculated value are set. The target value of the inductance is set, or the value proportional to the calculated inductance value becomes the set target value. Proposes a driving device of the solenoid, it characterized in that it and a duty ratio control means for controlling the duty ratio.

According to the present invention, the voltage value measuring means measures the DC voltage value applied to the solenoid and stores the measured value. The current value measuring means measures the DC current value supplied to the solenoid at a plurality of specific timings when measuring the DC voltage value, and stores the measured value. The calculation means calculates the solenoid inductance value or a value proportional to the inductance value from the stored measurement value. The duty ratio control means controls the duty ratio so that the calculated value becomes a target value of the set inductance, or so that a value proportional to the calculated inductance value becomes a set target value. Therefore, by calculating the solenoid inductance with a simple circuit configuration and reducing the duty ratio of the pulse voltage supplied to the solenoid, the solenoid inductance value is converged to the target value, thereby reducing wasted power. be able to.

(2) In the solenoid drive device according to (1), the voltage value measuring unit measures the DC voltage value E applied to the solenoid, and the current value measuring unit is configured to turn the pulse voltage on. a DC current value at a plurality of timings when the pulse voltage measuring a DC current value at a plurality of timings during off, the arithmetic means, di from the DC current value at a plurality of timings when the pulse voltage on / D1 which becomes dt and D2 which becomes di / dt are calculated from DC current values at a plurality of timings when the pulse voltage is turned off, and E / (D1-D2) is calculated to calculate the inductance value of the solenoid or A solenoid driving apparatus is proposed that calculates a value proportional to the inductance value.

According to the present invention, the voltage value measuring means measures the DC voltage value E applied to the solenoid, and the current value measuring means determines the DC current values at a plurality of timings when the pulse voltage is on and the pulse voltage is off. DC current values at a plurality of timings are measured. Then, the computing means calculates D1 that is di / dt from the DC current values at a plurality of timings when the pulse voltage is on, and D2 that is di / dt from the DC current values at a plurality of timings when the pulse voltage is off. At the same time, E / (D1-D2) is calculated to calculate an inductance value of the solenoid or a value proportional to the inductance value. Therefore, based on the measured voltage value and current value, the solenoid inductance value or a value proportional to the inductance value can be accurately calculated without applying a large calculation load by a simple calculation formula.

(3) In the solenoid drive device according to (1), the present invention includes a DC voltage value measured by the voltage value measuring unit, a DC current value measured by the current value measuring unit, and an inductance value of the solenoid. Providing a solenoid drive device comprising a data table for storing the data in association with each other, wherein the calculation means calculates an inductance value of the solenoid or a value proportional to the inductance value using the data table. .

According to this invention, the data table for storing the DC voltage value measured by the voltage value measuring means, the DC current value measured by the current value measuring means, and the inductance value of the solenoid in association with each other is provided, and the computing means is the data table. Is used to calculate the inductance value of the solenoid or a value proportional to the inductance value. Therefore, the data table that associates the DC voltage value, DC current value, and solenoid inductance value is used to calculate the solenoid inductance value or a value proportional to the inductance value. The solenoid inductance value or a value proportional to the inductance value can be calculated.

(4) The present invention relates to a solenoid driving method for controlling a DC current supplied to a solenoid by controlling a duty ratio of a pulse voltage applied to the solenoid, the DC voltage value being applied to the solenoid A first step of measuring the DC current value supplied to the solenoid at a plurality of specific timings when measuring the DC voltage value, the first step and the second step. A third step of storing the measured value measured in the step, a fourth step of calculating an inductance value of the solenoid or a value proportional to the inductance value from the stored measured value, and the calculated value Set to a target value for the set inductance or a value proportional to the calculated inductance value. So that the target value has proposed a method of driving a solenoid, it characterized in that it and a fifth step of controlling the duty ratio.

According to the present invention, the DC voltage value applied to the solenoid is measured, and the DC current value supplied to the solenoid is measured at a plurality of specific timings when the DC voltage value is measured. Then, the measured measurement value is stored, and the solenoid inductance value or a value proportional to the inductance value is calculated from the stored measurement value so that the calculated value becomes the set inductance target value, or The duty ratio is controlled so that a value proportional to the calculated inductance value becomes a set target value. Therefore, by calculating the inductance of the solenoid with a simple configuration and reducing the duty ratio of the pulse voltage supplied to the solenoid, the solenoid inductance value is converged to the target value, thereby reducing wasted power. Can do.

(5) In the solenoid driving method of (4), the present invention measures the DC voltage value E applied to the solenoid in the first step, and the pulse voltage in the second step. a DC current value at a plurality of timings when on the a DC current at a plurality of timings when the pulse voltage off measures, in the fourth step, the direct current value at a plurality of timings when the pulse voltage on D1 which becomes di / dt and D2 which becomes di / dt from DC current values at a plurality of timings when the pulse voltage is off, and E / (D1-D2) is calculated, Proposal of a solenoid drive method characterized by calculating an inductance value or a value proportional to the inductance value To have.

According to the present invention, in the first step, the DC voltage value E applied to the solenoid is measured, and in the second step, the DC current value and the pulse voltage at a plurality of timings when the pulse voltage is on. The DC current values at a plurality of timings at the time of OFF are measured, and in the fourth step, D1 that is di / dt from the DC current values at the plurality of timings at the time of turning on the pulse voltage and a plurality of timings at the time of turning off the pulse voltage. D2 which is di / dt is calculated from the DC current value at, and E / (D1-D2) is calculated to calculate an inductance value of the solenoid or a value proportional to the inductance value. Therefore, based on the measured DC voltage value and DC current value, a simple calculation formula can be used to accurately calculate the solenoid inductance value or a value proportional to the inductance value without imposing a large calculation load. it can.

(6) The present invention relates to the solenoid driving method of (4), and includes the DC voltage value measured in the first step, the DC current value measured in the second step, and the inductance value of the solenoid. A method for driving a solenoid comprising a data table to be stored in association with each other and calculating an inductance value of the solenoid or a value proportional to the inductance value using the data table in the fourth step doing.

According to this invention, the data table for storing the DC voltage value measured in the first step, the DC current value measured in the second step, and the inductance value of the solenoid in association with each other is provided. Using the data table, the solenoid inductance value or a value proportional to the inductance value is calculated. Therefore, since the solenoid inductance value or a value proportional to the inductance value is calculated based on the data table in which the voltage value, the current value, and the inductance value of the solenoid are associated with each other, it is possible to accurately calculate the solenoid without applying any calculation load. Inductance value or a value proportional to the inductance value can be calculated.

(7) The present invention is a program for causing a computer to execute a solenoid driving method for controlling a current supplied to a solenoid by controlling a duty ratio of a pulse voltage applied to the solenoid. A first step of measuring a DC voltage value applied to the second current step, and a second step of measuring a DC current value supplied to the solenoid at a plurality of specific timings when measuring the DC voltage value; A third step of storing the measurement values measured in the first step and the second step; and a fourth step of calculating an inductance value of the solenoid or a value proportional to the inductance value from the stored measurement values. The step and the calculated value become a set inductance target value, or the calculation And so that the value proportional to the inductance value becomes a target value set proposes a program for executing a fifth step of controlling the duty ratio, to the computer.

According to the present invention, the DC voltage value applied to the solenoid is measured, and the DC current value supplied to the solenoid is measured at a plurality of specific timings when the DC voltage value is measured. Then, the measured measurement value is stored, and the solenoid inductance value or a value proportional to the inductance value is calculated from the stored measurement value so that the calculated value becomes the set inductance target value, or The duty ratio is controlled so that a value proportional to the calculated inductance value becomes a set target value. Therefore, by calculating the inductance of the solenoid with a simple configuration and reducing the duty ratio of the pulse voltage supplied to the solenoid, the solenoid inductance value is converged to the target value, thereby reducing wasted power. Can do.

(8) In the program of (7), the present invention measures the DC voltage value E applied to the solenoid in the first step, and in the second step, when the pulse voltage is on. a DC current value at a plurality of timings, the pulse voltage measuring a DC current value at a plurality of timings during off, in the fourth step, the pulse voltage from the DC current value at a plurality of timings during on di / D1 which becomes dt and D2 which becomes di / dt are calculated from DC current values at a plurality of timings when the pulse voltage is turned off, and E / (D1-D2) is calculated to calculate the inductance value of the solenoid or A program is proposed which calculates a value proportional to the inductance value.

According to the present invention, in the first step, the DC voltage value E applied to the solenoid is measured, and in the second step, the DC current value and the pulse voltage at a plurality of timings when the pulse voltage is on. The DC current values at a plurality of timings at the time of OFF are measured, and in the fourth step, D1 that is di / dt from the DC current values at the plurality of timings at the time of turning on the pulse voltage and a plurality of timings at the time of turning off the pulse voltage. D2 which is di / dt is calculated from the DC current value at, and E / (D1-D2) is calculated to calculate an inductance value of the solenoid or a value proportional to the inductance value. Therefore, based on the measured DC voltage value and DC current value, a simple calculation formula can be used to accurately calculate the solenoid inductance value or a value proportional to the inductance value without imposing a large calculation load. it can.

(9) The present invention stores the DC voltage value measured in the first step, the DC current value measured in the second step, and the solenoid inductance value in association with the program of (7). In the fourth step, there is proposed a program characterized in that in the fourth step, an inductance value of the solenoid or a value proportional to the inductance value is calculated using the data table.

According to this invention, the data table for storing the DC voltage value measured in the first step, the DC current value measured in the second step, and the inductance value of the solenoid in association with each other is provided. Using the data table, the solenoid inductance value or a value proportional to the inductance value is calculated. Therefore, the data table that associates the DC voltage value, DC current value, and solenoid inductance value is used to calculate the solenoid inductance value or a value proportional to the inductance value. The solenoid inductance value or a value proportional to the inductance value can be calculated.

According to the present invention, a current required for starting and operating the solenoid is supplied to the solenoid at the time of starting and operating the solenoid with a simple circuit configuration, and a current required for holding is supplied at the time of holding. There is an effect that it can be controlled.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the constituent elements in the present embodiment can be appropriately replaced with existing constituent elements and the like, and various variations including combinations with other existing constituent elements are possible. Therefore, the description of the present embodiment does not limit the contents of the invention described in the claims.

<First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS.

<Configuration of drive device>
The configuration of the solenoid driving apparatus according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, the solenoid driving apparatus according to the present embodiment includes a solenoid 1, a voltage measurement unit 2, a current measurement unit 3, a calculation unit 4, a duty ratio adjustment unit 5, and a drive circuit 6. , And a DC power source 7 .

Here, the voltage measuring unit 2 measures the DC voltage supplied from the DC power supply 7 to the solenoid 1. As a specific circuit example, as shown in FIG. 2, the divided voltage value obtained by the resistors R21 and R22 is supplied to the buffer circuit formed by the operational amplifier IC21, impedance conversion is performed, and the arithmetic unit 4 is supplied. . Note that the circuit in FIG. 2 is merely an example, and other circuit configurations may be used.

The current measuring unit 3 measures the DC current value supplied to the solenoid 1 at a plurality of specific timings when measuring the DC voltage value. As a specific circuit example, as shown in FIG. 3, both ends of a resistor R23 inserted in series between the solenoid 1 and the ground are connected to a differential amplifier composed of resistors R24, R25, R26 and an operational amplifier IC22. The output of the operational amplifier IC22 is supplied to the arithmetic unit 4. Note that the circuit in FIG. 3 is merely an example, and other circuit configurations may be used.

The calculation unit 4 calculates the solenoid inductance value or a value proportional to the inductance value from the DC voltage value E measured by the voltage measurement unit 2 and the DC current value measured by the current measurement unit 3. Specifically, from the DC current value at a plurality of timings during the drive circuit 6 supplies a pulse voltage on a DC current at a plurality of timings when the pulse voltage off, the DC at a plurality of timings when the pulse voltage on D1 which is di / dt of the current value and D2 which is di / dt of the direct current value at a plurality of timings when the pulse voltage is off are calculated, and E / (D1-D2) is calculated to calculate the solenoid An inductance value or a value proportional to the inductance value is calculated. A specific calculation method will be described later.

The duty ratio adjustment unit 5 controls the duty ratio of the pulse voltage that the drive circuit 6 supplies to the solenoid 1 so that the inductance value calculated by the calculation unit 4 becomes the set inductance target value. The drive circuit 6 supplies a predetermined pulse voltage to the solenoid 1 based on the control of the duty ratio adjusting unit 5.

<Operation of drive device>
Hereinafter, the operation of the solenoid driving apparatus according to the present embodiment will be described in detail with reference to FIG.

First, the voltage measuring unit 2 measures the DC voltage value applied to the solenoid 1 by the drive circuit 6 (step S101). Next, the current measuring unit 3 measures the DC current value supplied to the solenoid 1 at a plurality of specific timings when measuring the voltage value (step S102), and temporarily stores these measured values. (Step S103).

The calculation unit 4 calculates the inductance value of the solenoid 1 or a value proportional to the inductance value from the temporarily stored measurement value (step S104). Here, the calculation method of the inductance value will be specifically described with reference to FIGS. 5 and 6.

FIG. 5 shows the relationship between the voltage and current supplied to the solenoid 1. Here, the current values i1 and i2 are acquired at a predetermined timing (time interval) t1 when the pulse voltage is on, and the current values i3 and i4 are acquired at a predetermined timing (time interval) t2 when the pulse voltage is off. Based on these values, di ₁ / dt ₁ when the pulse voltage is on and di ₂ / dt ₂ when the pulse voltage is off are calculated based on the following equation.
_{di 1 / dt 1 = (i} 2 -i 1) / t 1
di ₂ / dt ₂ = (i ₄ −i ₃ ) / t ₂

FIG. 6 shows a temporal change in the current flowing through the solenoid 1 and an enlarged view of a part thereof. As shown in FIG. 6, the current waveform becomes a sawtooth wave when enlarged. Here, in enlarged views (1) to (2), di / dt is approximated to be constant, and also in (2) to (3), it is approximated that di / dt is constant.

At this time, if the inductance L is approximated to be constant, the following relationship is established.
E−L * (di / dt) = Ri
Here, E is a voltage value of the solenoid 1, and R is a coefficient.

Therefore, from the above relational expression, in (1) to (2),
E−L * (di ₁ / dt ₁ ) = Ri
From (3) to (4),
−L * (di ₂ / dt ₂ ) = Ri
Is guided.

Therefore, when R and i are eliminated from both of the above equations, the inductance L is obtained as follows.
_{L = E / ((di 1} / dt 1) - (di 2 / dt 2))
Accordingly, if the voltage E of the solenoid 1, the current value at a plurality of timings when the pulse voltage supplied by the drive circuit 6 is turned on, and the current value at a plurality of timings when the pulse voltage is turned off are obtained, the inductance of the solenoid 1 is obtained. L can be obtained.

Then, the duty ratio is controlled so that the inductance value obtained above becomes the set inductance target value (step S105).

FIG. 7 shows changes in the current, attractive force, inductance value, and duty ratio of the solenoid 1 when the solenoid driving device of the present embodiment is used. When the required inductance value of the solenoid 1 is equal to or less than a predetermined value, the duty ratio adjusting unit 5 lowers the duty ratio of the pulse voltage supplied to the solenoid 1 by the drive circuit 6, thereby reducing the inductance value of the solenoid 1. The target value can be converged.

Therefore, according to the present embodiment, by calculating the inductance of the solenoid with a simple circuit configuration and lowering the duty ratio of the pulse voltage supplied to the solenoid, the inductance value of the solenoid is converged to the target value. , Wasteful power can be reduced.

<Second Embodiment>
A second embodiment of the present invention will be described with reference to FIG.

In the first embodiment, the case where the inductance of the solenoid 1 is obtained by calculation has been described. However, in this embodiment, the data table that stores the voltage value, current value, and inductance value of the solenoid 1 in association with each other. In advance, and the inductance of the solenoid 1 is obtained based on this data table.

Hereinafter, the operation of the solenoid driving apparatus according to the present embodiment will be described with reference to FIG.

First, the voltage measuring unit 2 measures the voltage value applied to the solenoid 1 by the drive circuit 6 (step S201). Next, the current measuring unit 3 measures the current value supplied to the solenoid 1 at specific timings when measuring the voltage value (step S202), and temporarily stores these measured values (step S202). Step S203).

Then, using the data table that stores the voltage value, current value, and inductance value of the solenoid 1 in association with each other, the inductance value of the solenoid 1 or a value proportional to the inductance value is obtained (step S204). The inductance value stored in the data table may be the one using the arithmetic expression shown in the first embodiment, or may be another method. Further, the duty ratio is controlled so that the inductance value obtained above becomes the set inductance target value (step S205).

Therefore, according to the present embodiment, the solenoid table inductance value or a value proportional to the inductance value is calculated from the data table in which the voltage value, the current value, and the solenoid inductance value are associated with each other. Without any problem, the solenoid inductance value or a value proportional to the inductance value can be calculated.

The attribute authentication system of the present invention is realized by recording an operation program executed by the solenoid driving device on a computer-readable recording medium, causing the driving device to read and execute the program recorded on the recording medium. can do. The computer system here includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW (World Wide Web) system is used. The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.

The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

As described above, the present invention is not limited to the above-described embodiment, and various modifications and applications can be made without departing from the gist of the present invention.

It is a figure which shows the structure of the drive device of the solenoid which concerns on 1st Embodiment. It is a figure which shows the internal circuit of the voltage measurement part which concerns on 1st Embodiment. It is a figure which shows the internal circuit of the electric current measurement part which concerns on 1st Embodiment. It is an operation | movement flow of the drive device of the solenoid which concerns on 1st Embodiment. It is a figure which shows the relationship between the voltage of a solenoid, and an electric current. It is a figure for demonstrating the calculation method of an inductance. It is a figure which shows the relationship of the electric current of a solenoid, attractive force, inductance, and duty ratio. It is an operation | movement flow of the drive device of the solenoid which concerns on 2nd Embodiment. It is a figure which shows the relationship of the electric current of the solenoid which concerns on a prior art example, attractive force, inductance, and duty ratio. It is a block diagram of the electricity supply control circuit which concerns on a prior art example.

DESCRIPTION OF SYMBOLS 1 ... Solenoid 2 ... Voltage measurement part 3 ... Current measurement part 4 ... Calculation part 5 ... Duty ratio adjustment part 6 ... Drive circuit
7 ... DC power supply R21 ... resistor R22 ... resistor R23 ... resistor R24 ... resistor R25 ... resistor R26 ... resistor IC21 ... operational amplifier IC22 ... operational amplifier

Claims (9)

A solenoid driving device that controls a direct current supplied to a solenoid by controlling a duty ratio of a pulse voltage applied to the solenoid,
A DC power source connected to the input of the solenoid;
A voltage value measuring means for measuring a DC voltage value applied to the solenoid and storing the measured value;
Current value measuring means for measuring a direct current value supplied to the solenoid at a plurality of specific timings when measuring the direct current voltage value, and storing the measured value;
An arithmetic means for calculating an inductance value of the solenoid or a value proportional to the inductance value from the stored measurement value;
A duty ratio control means for controlling the duty ratio so that the calculated value becomes a set inductance target value, or a value proportional to the calculated inductance value becomes a set target value;
A solenoid driving device comprising: The voltage value measuring means measures a DC voltage value E applied to the solenoid,
Said current value measuring means, the DC current value at a plurality of timings when the pulse voltage on, a DC current at a plurality of timings when the pulse voltage off measures,
The calculation means calculates D1 which is di / dt from the DC current values at a plurality of timings when the pulse voltage is on, and D2 which is di / dt from the DC current values at a plurality of timings when the pulse voltage is off. The solenoid driving device according to claim 1, wherein E / (D1-D2) is calculated to calculate an inductance value of the solenoid or a value proportional to the inductance value. A data table for storing the DC voltage value measured by the voltage value measuring means, the DC current value measured by the current value measuring means, and the inductance value of the solenoid;
2. The solenoid driving apparatus according to claim 1, wherein the calculating means calculates an inductance value of the solenoid or a value proportional to the inductance value using the data table. A solenoid driving method for controlling a direct current supplied to a solenoid by controlling a duty ratio of a pulse voltage applied to the solenoid,
A first step of measuring a DC voltage value applied to the solenoid;
A second step of measuring a DC current value supplied to the solenoid at a plurality of specific timings when measuring the DC voltage value;
A third step of storing the measured values measured in the first step and the second step;
A fourth step of calculating an inductance value of the solenoid or a value proportional to the inductance value from the stored measurement value;
A fifth step of controlling the duty ratio so that the calculated value becomes a set inductance target value, or a value proportional to the calculated inductance value becomes a set target value;
A method for driving a solenoid, comprising: In the first step, the DC voltage value E applied to the solenoid is measured,
In the second step, the DC current value at a plurality of timings when the pulse voltage on, a DC current at a plurality of timings when the pulse voltage off measures,
In the fourth step, D1 which is di / dt from the DC current values at a plurality of timings when the pulse voltage is on, and D2 which is di / dt from the DC current values at a plurality of timings when the pulse voltage is off 5. The solenoid driving method according to claim 4, wherein E / (D1-D2) is calculated to calculate an inductance value of the solenoid or a value proportional to the inductance value. A data table for storing the DC voltage value measured in the first step, the DC current value measured in the second step, and the inductance value of the solenoid;
5. The solenoid driving method according to claim 4, wherein, in the fourth step, an inductance value of the solenoid or a value proportional to the inductance value is calculated using the data table. A program for causing a computer to execute a solenoid driving method for controlling a current supplied to a solenoid by controlling a duty ratio of a pulse voltage applied to the solenoid,
A first step of measuring a DC voltage value applied to the solenoid;
A second step of measuring a DC current value supplied to the solenoid at a plurality of specific timings when measuring the DC voltage value;
A third step of storing the measured values measured in the first step and the second step;
A fourth step of calculating an inductance value of the solenoid or a value proportional to the inductance value from the stored measurement value;
A fifth step of controlling the duty ratio so that the calculated value becomes a set inductance target value, or a value proportional to the calculated inductance value becomes a set target value;
A program that causes a computer to execute. In the first step, the DC voltage value E applied to the solenoid is measured,
In the second step, the DC current value at a plurality of timings when the pulse voltage on, a DC current at a plurality of timings when the pulse voltage off measures,
In the fourth step, D1 which is di / dt from the DC current values at a plurality of timings when the pulse voltage is on, and D2 which is di / dt from the DC current values at a plurality of timings when the pulse voltage is off The program according to claim 7, wherein E / (D1-D2) is calculated to calculate an inductance value of the solenoid or a value proportional to the inductance value. A data table for storing the DC voltage value measured in the first step, the DC current value measured in the second step, and the inductance value of the solenoid;
The program according to claim 7, wherein in the fourth step, an inductance value of the solenoid or a value proportional to the inductance value is calculated using the data table.

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