Proportional solenoid valve, control method, system and control device thereof, heat source device and control method thereof, recording medium, control device, and hot water supply device

Abstract

A control method of a proportional solenoid valve (28) whose valve opening degree is controlled by excitation of a proportional solenoid, wherein the control method of the proportional solenoid valve includes the following steps: generating a drive current (id) that excites the proportional solenoid (28); inverting the polarity of the drive current (id) at a faster cycle than the movement of a spool (18); and controlling the valve opening degree by the current level of the drive current (id). Thus, the proportional solenoid (28) generates an alternating magnetic field to avoid the influence of residual magnetism, and the desired valve opening degree is obtained by the level of the drive current (id).

Description

Technical Field

[0001] This disclosure relates to proportional solenoid valves used, for example, in control valves for fuel gases, their control techniques, or heat source devices, control methods, procedures, control devices, and control techniques for hot water supply devices that use proportional solenoid valves in the control of fuel gases. Background Technology

[0002] Valves are used in the control of fluids such as fuel gases, and among these valves, proportional solenoid valves are known to control the valve opening degree by excitation of a solenoid. The opening degree control of proportional solenoid valves can be achieved, for example, using PWM (pulse width modulation) based control. Regarding PWM-based control of such proportional solenoid valves, control that adjusts the period of flutter vibration regardless of the magnitude of the energizing current is known in suspension control devices (Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 10-258625 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, in a proportional solenoid valve, a difference arises between the drive current used to increase the drive current flowing in the solenoid to reach a specific valve opening and the drive current used to decrease the drive current to reach the same valve opening. Furthermore, a difference also arises between the valve opening when the drive current is increased to reach a specific drive current and when the drive current is decreased to reach the same drive current. In other words, there is a hysteresis between the drive current and the valve opening; even with the same drive current, the valve opening will differ due to the direction of its increase or decrease, and even with the same valve opening, the drive current will differ.

[0008] Using proportional solenoid valves with such hysteresis characteristics can affect the fluid control of fuel gases, etc., and impair the reliability of control characteristics. The main reason for this hysteresis is the magnetization characteristic of the proportional solenoid valve, especially its remanence. When using magnetic materials, the effect of this remanence cannot be ignored.

[0009] The study of remanence and solenoid excitation presents the following challenges: when a proportional solenoid is energized in the same direction as the remanence, the remanence is applied to generate a magnetic force; conversely, when a proportional solenoid is energized in the opposite direction to the remanence, a portion of the generated magnetic force is canceled out by the remanence.

[0010] Regarding this issue, the inventors have gained the following insights: To reduce the influence of residual magnetism, it is only necessary to generate an alternating magnetic field in the proportional solenoid. Even the driving current that generates this alternating magnetic field can be used to obtain the desired valve opening through the level of the driving current.

[0011] The subject matter is not disclosed or taught in Patent Document 1, and the structure disclosed in Patent Document 1 cannot solve the subject matter.

[0012] Therefore, in view of the above issues and insights, the object of this disclosure is to generate an alternating magnetic field in a proportional solenoid to avoid the influence of residual magnetism, and to obtain the desired valve opening by means of the level of the drive current.

[0013] Methods for solving problems

[0014] To achieve the above objectives, one aspect of the control method for a proportional solenoid valve disclosed herein is a control method for a proportional solenoid valve in which the valve opening is controlled by the excitation of a proportional solenoid. This control method includes the following steps: generating a drive current to excite the proportional solenoid; reversing the polarity of the drive current at a period faster than the movement of the valve core; and controlling the valve opening by the current level of the drive current.

[0015] In the above-described control method for a proportional solenoid valve, the control method may also include the following steps: generating a positive pulse, which includes a polarity reversal part that reverses the polarity of the reversed drive current to the positive direction; generating a reverse pulse, which includes a polarity reversal part that reverses the polarity of the positive drive current to the reverse direction; controlling the duty cycle of the positive pulse except for the polarity reversal part; and controlling the duty cycle of the reverse pulse except for the polarity reversal part.

[0016] To achieve the above objectives, one side of the proportional solenoid valve system disclosed herein includes: a proportional solenoid valve whose valve opening is controlled by the excitation of a proportional solenoid; a drive unit that generates a drive current to excite the proportional solenoid and causes the drive current to flow into the proportional solenoid; and a control unit that reverses the polarity of the drive current at a period faster than the movement of the valve core, thereby controlling the valve opening by the current level of the drive current.

[0017] In the aforementioned proportional solenoid valve system, the proportional solenoid valve system may further include: a logic circuit that generates a positive pulse, the positive pulse including a polarity reversal part that reverses the polarity of the reversed drive current to the positive direction, and generates a reverse pulse, the reverse pulse including a polarity reversal part that reverses the polarity of the positive drive current to the reverse direction; and a pulse width control unit that controls the duty cycle of the positive pulse (excluding the polarity reversal part) or the duty cycle of the reverse pulse (excluding the polarity reversal part).

[0018] To achieve the above objectives, one side of the control device for the proportional solenoid valve disclosed herein includes: a drive unit that generates a drive current to excite a proportional solenoid that controls the valve opening by energizing it, and causes the drive current to flow into the proportional solenoid; and a control unit that reverses the polarity of the drive current at a period faster than the movement of the valve core, and controls the valve opening by the current level of the drive current.

[0019] In the control device for the aforementioned proportional solenoid valve, the control unit may include: a logic circuit that generates a positive pulse, which includes a polarity reversal part that reverses the polarity of the reversed drive current to the positive direction, and generates a reverse pulse, which includes a polarity reversal part that reverses the polarity of the positive drive current to the reverse direction; and a pulse width control unit that controls the duty cycle of the positive pulse (excluding the polarity reversal part) or the duty cycle of the reverse pulse (excluding the polarity reversal part).

[0020] To achieve the above objectives, one aspect of the valve opening control program disclosed herein is a valve opening control program implemented by a computer, wherein the valve opening control program performs the following functions through the computer: generating control information for generating a drive current for energizing a proportional solenoid; generating control information for reversing the polarity of the drive current at a period faster than the movement of the valve core; and generating control information for controlling the valve opening through the current level of the drive current.

[0021] In the above-described valve opening control program, the valve opening control program may also implement the following functions through the computer: generating a positive pulse, which includes a polarity reversal part that reverses the polarity of the reversed drive current to the positive direction; generating a reverse pulse, which includes a polarity reversal part that reverses the polarity of the positive drive current to the reverse direction; controlling the duty cycle of the positive pulse except for the polarity reversal part; and controlling the duty cycle of the reverse pulse except for the polarity reversal part.

[0022] To achieve the above objectives, one side of the proportional solenoid valve disclosed herein includes: a valve mechanism controlled by the excitation of a proportional solenoid; a drive unit that flows a drive current into the proportional solenoid; and a control unit that reverses the polarity of the drive current at a period faster than the movement of the valve core to counteract residual magnetism, and adjusts the valve opening by the current level of the drive current.

[0023] To achieve the above objectives, one side of the proportional solenoid valve of this disclosure includes: a valve mechanism; a proportional solenoid that controls the valve mechanism by excitation; a drive unit that generates a drive current to excite the proportional solenoid and causes the drive current to flow into the proportional solenoid; and a control unit that reverses the polarity of the drive current at a period faster than the movement of the valve core, and controls the valve opening degree by the current level of the drive current.

[0024] In the aforementioned proportional solenoid valve, the control unit may include: a logic circuit that generates a positive pulse, which includes a polarity reversal part that reverses the polarity of the reversed drive current to a positive polarity reversal part, and generates a reverse pulse, which includes a polarity reversal part that reverses the polarity of the positive drive current to a reverse polarity reversal part; and a pulse width control unit that controls the duty cycle of the positive pulse (excluding the polarity reversal part) or the duty cycle of the reverse pulse (excluding the polarity reversal part).

[0025] To achieve the above objectives, one side of the heat source device disclosed herein includes: a burner that ignites fuel gas; a proportional solenoid valve whose opening degree is controlled by the excitation of a proportional solenoid, the proportional solenoid valve allowing fuel gas supplied to the burner to pass through; a drive unit that generates a drive current that excites the proportional solenoid and causes the drive current to flow into the proportional solenoid; and a control unit that reverses the polarity of the drive current at a period faster than the movement of the valve core, controlling the valve opening degree by the current level of the drive current.

[0026] In the above-mentioned heat source device, the heat source device may also include: a heat exchanger that allows the combustion heat of the fuel gas to exchange heat with the heated fluid; and a temperature sensor that detects the temperature of the heated fluid, wherein the control unit receives the detected temperature of the heated fluid and controls the valve opening.

[0027] In the aforementioned heat source device, the control unit may also include: a logic circuit that generates a positive pulse, the positive pulse including a polarity reversal part that reverses the polarity of the reversed drive current to a positive polarity reversal part, and generates a reverse pulse, the reverse pulse including a polarity reversal part that reverses the polarity of the positive drive current to a reverse polarity reversal part; and a pulse width control unit that controls the duty cycle of the positive pulse (excluding the polarity reversal part) or the duty cycle of the reverse pulse (excluding the polarity reversal part).

[0028] To achieve the above objectives, one aspect of the control method for the heat source device disclosed herein is a control method for a heat source device using a proportional solenoid valve in the control of fuel gas. This control method includes the following steps: generating a drive current to drive the proportional solenoid valve; causing the fuel gas passing through the proportional solenoid valve to combust; reversing the polarity of the drive current at a period faster than the movement of the valve core; and controlling the valve opening degree by the current level of the drive current.

[0029] In the control method of the above-mentioned heat source device, the control method of the heat source device may also include the following steps: exchanging the combustion heat of the fuel gas with the heated fluid; and detecting the temperature of the heated fluid, and controlling the valve opening degree according to the detected temperature of the heated fluid.

[0030] In the control method of the heat source device described above, the control method of the heat source device may further include the following steps: generating a positive pulse, the positive pulse including a polarity reversal part that reverses the polarity of the reversed driving current to the positive direction; generating a reverse pulse, the reverse pulse including a polarity reversal part that reverses the polarity of the positive driving current to the reverse direction; controlling the duty cycle of the positive pulse except for the polarity reversal part; and controlling the duty cycle of the reverse pulse except for the polarity reversal part.

[0031] To achieve the above objectives, one aspect of the control program for the heat source device disclosed herein is a control program for the heat source device implemented by a computer. The control program for the heat source device performs the following functions through the computer: generating control information for generating a drive current for energizing a proportional solenoid; generating control information for reversing the polarity of the drive current at a period faster than the movement of the valve core; and generating control information for controlling the valve opening degree through the current level of the drive current.

[0032] In the control program of the aforementioned heat source device, the control program of the heat source device may also implement the following functions through the computer: generating a positive pulse, the positive pulse including a polarity reversal part that reverses the polarity of the reversed driving current to the positive direction; generating a reverse pulse, the reverse pulse including a polarity reversal part that reverses the polarity of the positive driving current to the reverse direction; controlling the duty cycle of the positive pulse except for the polarity reversal part; and controlling the duty cycle of the reverse pulse except for the polarity reversal part.

[0033] To achieve the above objectives, the above procedures are stored in one aspect of the recording medium according to this disclosure.

[0034] To achieve the above objectives, one aspect of the control device disclosed herein is a control device for controlling the amount of combustion gas, wherein the control device comprises: a drive unit that generates a drive current that excites a proportional solenoid that controls the valve opening by energizing it, and causes the drive current to flow into the proportional solenoid; and a control unit that reverses the polarity of the drive current at a period faster than the movement of the valve core, and controls the valve opening by the current level of the drive current.

[0035] In the above-described control device, the control unit may also include: a logic circuit that generates a positive pulse, the positive pulse including a polarity reversal part that reverses the polarity of the reversed drive current to a positive polarity reversal part, and generates a reverse pulse, the reverse pulse including a polarity reversal part that reverses the polarity of the positive drive current to a reverse polarity reversal part; and a pulse width control unit that controls the duty cycle of the positive pulse (excluding the polarity reversal part) or the duty cycle of the reverse pulse (excluding the polarity reversal part).

[0036] To achieve the above objectives, one side of the hot water supply device disclosed herein has any one of the above-mentioned heat source device, the control method of the above-mentioned heat source device, the control program of the above-mentioned heat source device, the above-mentioned recording medium, and the above-mentioned control device. The hot water supply device heats the supply water and provides hot water at a supply water temperature that has been heated to a set temperature.

[0037] According to this disclosure, any of the following effects can be obtained.

[0038] (1) The polarity of the driving current flowing in the solenoid is reversed to generate an alternating magnetic field in the solenoid, which can counteract the residual magnetism and thus reduce the hysteresis caused by the residual magnetism.

[0039] (2) It can control the valve opening degree by the level of the driving current without being affected by residual magnetism.

[0040] (3) It can reduce the difference between the drive current when the drive current flowing in the solenoid is increased to control a specific opening degree and the drive current when the drive current is reduced to control a specific valve opening degree.

[0041] (4) It can reduce the difference between the valve opening when the driving current flowing in the solenoid is increased to reach a specific driving current and the valve opening when the driving current is reduced to control the specific driving current.

[0042] (5) It can reduce or avoid the influence of residual magnetism in the proportional solenoid valve, and the difference between the valve opening relative to the drive current in the direction of increasing and decreasing current level becomes smaller. Therefore, when a proportional solenoid valve is used in the control of fuel gas supply, it can prevent the difference in fuel gas supply relative to the drive current.

[0043] Furthermore, other objects, features, and advantages of the present invention can be made more apparent by referring to the accompanying drawings and various embodiments. Attached Figure Description

[0044] Figure 1 This is a diagram illustrating the proportional solenoid valve system of the first embodiment.

[0045] Figure 2 This is a diagram showing the valve mechanism of a proportional solenoid valve.

[0046] Figure 3 This is a diagram showing the valve drive mechanism of a proportional solenoid valve.

[0047] Figure 4 This is a flowchart illustrating the control process of a proportional solenoid valve.

[0048] Figure 5 This is a flowchart illustrating an example of polarity reversal and level control of the drive current id in the control process.

[0049] Figure 6 This is a diagram illustrating the polarity reversal, level control, and attraction generation of the drive current based on PWM control.

[0050] Figure 7 This is a diagram illustrating the proportional solenoid valve system of the second embodiment.

[0051] Figure 8 This is a diagram illustrating the proportional solenoid valve of the third embodiment.

[0052] Figure 9 This is a diagram showing a hot water supply device according to the fourth embodiment.

[0053] Figure 10 This is a front view showing the valve unit.

[0054] Figure 11 It is along Figure 10 The cut-off end face view of the valve unit obtained by cutting the XI-XI line.

[0055] Figure 12 It is along Figure 10 The cut-off end face view of the valve unit obtained by cutting the XII-XII line.

[0056] Figure 13 This is a diagram showing one action of a valve unit.

[0057] Figure 14 This is a diagram showing one action of a valve unit.

[0058] Figure 15 This is a flowchart showing the hot water supply control.

[0059] Figure 16 This is a diagram showing the valve unit and control system of the fifth embodiment.

[0060] Figure 17 This is a diagram showing the operating characteristics of a proportional solenoid valve driven by a drive current without polarity reversal.

[0061] Figure 18 This is a diagram showing the operating characteristics of a proportional solenoid valve driven by a drive current with reversed polarity. Detailed Implementation

[0062] [First Embodiment]

[0063] Figure 1 The proportional solenoid valve system 2 of the first embodiment is shown. Figure 1 The structure shown is an example, and this disclosure is not limited to this structure.

[0064] The proportional solenoid valve system 2 includes a proportional solenoid valve 4 and a control device 6. The proportional solenoid valve 4 is, for example, installed in a fluid path 8 for which a fluid Q, such as fuel gas, flows. The valve chamber 10 has an inlet port 12-1 and an outlet port 12-2. Fluid Q flowing in the fluid path 8 is introduced into the valve chamber 10 from the inlet port 12-1, and flows from the valve chamber 10 through the valve mechanism 14 back to the fluid path 8 from the outlet port 12-2. The flow direction of fluid Q indicated by the arrow is only one example.

[0065] The valve mechanism 14 has a valve seat 16 and a valve core 18. The valve seat 16 is fixed to the wall of the valve chamber 10. The valve core 18 moves in a direction perpendicular to the valve seat surface of the valve seat 16.

[0066] A portion of the diaphragm 24 is mounted to the shaft portion 20 formed on the central axis of the valve core 18 via the support member 22. The outer edge of the diaphragm 24 is supported between the inner walls of the valve chamber 10. Therefore, the valve core 18 is supported in the valve chamber 10 by the diaphragm 24 in a manner that allows it to move up and down. Moreover, when the pressure of the fluid Q acts on the valve chamber 10, the diaphragm 24 bulges, thereby pulling the valve core 18 down.

[0067] In the proportional solenoid valve 4, a movable magnetic pole 26 is provided relative to the valve core 18, and this movable magnetic pole 26 contacts the shaft portion 20 of the valve core 18. That is, the movable magnetic pole 26 constitutes a plunger. This movable magnetic pole 26 is inserted into the proportional solenoid 28 and can move along the central axis of the valve core 18. A yoke 32 is provided in the proportional solenoid 28, holding a coil 30. The coil 30 is provided in the proportional solenoid 28 in such a way that it is wound around a coil holder 34. Therefore, the yoke 32 constitutes a fixed magnetic pole relative to the movable magnetic pole 26.

[0068] A support frame 36 is fixed to the side of the yoke 32. A space 38 is formed in the support frame 36 to allow the diaphragm 24 to bulge. A support member 40 is fixed to the yoke 32. The support member 40 has a spring support portion 42. A spring insertion portion 44 is formed in the movable magnetic pole 26, and a coil-shaped spring 46 is provided between the spring insertion portion 44 and the spring support portion 42. Therefore, the restoring force of the spring 46 acts on the movable magnetic pole 26.

[0069] The control device 6, for example, includes a drive unit 48 and a control unit 50, which generate, reverse the polarity of, and control the level of the drive current id. The drive unit 48 generates the drive current id under the control of the control unit 50, and causes this drive current id to flow into the proportional solenoid 28. The control unit 50, for example, is a computer that receives the detection outputs of various sensors, such as temperature sensors and water flow sensors, as control signals Sin, and performs information processing for controlling the proportional solenoid valve 4. This information processing includes the following:

[0070] (a) Control for generating drive current id

[0071] (b) Polarity reversal of the drive current id based on a cycle faster than the movement of valve core 18

[0072] (c) Valve opening control based on the current level of the drive current id

[0073] <Valve Mechanism 14>

[0074] Figure 2 The valve mechanism 14 of the proportional solenoid valve 4 is shown in magnified view. The valve seat 16 is fixed to the valve chamber 10 by a retaining frame 51. The valve seat 16 is sealed to the inner wall of the valve chamber 10 by an O-ring 52.

[0075] The valve core 18 has a conical face 54, and the valve function is realized by the conical face 54 and the valve port 56 of the valve seat 16.

[0076] The valve chamber 10 has, for example, a circular recess 58 formed on the central axis of the valve core 18 opposite to one side of the valve core 18. A protrusion 60 is formed on the large-diameter portion of the valve core 18 opposite to the recess 58. In the valve chamber 10, when the valve core 18 moves, the protrusion 60 enters the recess 58, thereby allowing the valve core 18 to move.

[0077] <Valve Actuation Mechanism 62 and Generation of Attractive Force F>

[0078] Figure 3 The valve actuation mechanism 62 of the proportional solenoid valve 4 is shown. The valve actuation mechanism 62 drives the valve core 18 in the vertical direction by excitation of the drive current id.

[0079] When a drive current id flows into the proportional solenoid 28, a magnetic field φ is generated within it. This magnetizes the movable magnetic pole 26 and the yoke 32 (fixed magnetic pole), generating distinct magnetic poles N and S within them. Furthermore, the movable magnetic pole 26 moves in the direction of the attraction force F based on the magnetic pole NS. Since distinct magnetic poles N and S are generated in the movable magnetic pole 26 and yoke 32 regardless of the direction of the drive current id, the attraction force F based on the magnetic pole NS is effective.

[0080] <Polarity reversal of drive current id>

[0081] In the valve actuation mechanism 62, when the polarity of the drive current id is reversed at a certain period, the polarities of the N and S poles in the movable magnetic pole 26 and yoke 32 are reversed. Conversely, an attractive force F in the same direction acts between them. As a result, in the valve actuation mechanism 62, a valve opening degree corresponding to the current level of the drive current id can be obtained regardless of the polarity. Thus, in the valve actuation mechanism 62, by reversing the drive current id, the magnetization directions of the movable magnetic pole 26 and yoke 32 are reversed, and therefore the residual magnetism is canceled out by the reverse current, eliminating the influence of residual magnetism.

[0082] <Control Procedures for Proportional Solenoid Valve 4>

[0083] Figure 4 An example of the control process of the proportional solenoid valve 4 is shown. This control process includes: generating the drive current id (S101), reversing the polarity of the drive current id (S102), and controlling the current level of the drive current id (S103), etc.

[0084] Generate drive current id (S101): The control device 6 generates a drive current id that flows into the proportional solenoid 28.

[0085] Reversing the polarity of the drive current id (S102): The control device 6 reverses the polarity of the drive current id at a cycle faster than the moving speed of the valve core 18. The movement of the valve core 18 depends on the change in the current level of the drive current id, and the polarity reversal of the drive current id is performed at a cycle faster than the moving speed of the valve core 18, for example, at 1 / 2 of the flutter period Td.

[0086] Controlling the current level of the drive current id (S103): The control device 6 controls the current level of the drive current id and controls the valve mechanism 14 to a valve opening degree corresponding to the current level.

[0087] Figure 5 An example of polarity reversal and level control of the drive current id in this control process is shown. This control process includes: inputting the control signal Sin (S201), calculating the duty cycle of the positive pulse (S202), calculating the duty cycle of the reverse pulse (S203), generating the positive pulse (and performing pulse control based on the calculated duty cycle) (S204), generating the reverse pulse (and performing pulse control based on the calculated duty cycle) (S205), and controlling the valve opening (S206), etc.

[0088] Input control signal Sin (S201): The control device 6 receives the control signal Sin for controlling the valve opening of the valve mechanism 14. The valve opening is controlled according to the signal level of the control signal Sin.

[0089] Calculate the duty cycle of the positive pulse (S202): The control device 6 calculates the duty cycle of the positive pulse other than the polarity control pulse Psw1 (polarity reversal unit) described later.

[0090] Calculate the duty cycle of the reverse pulse (S203): The control device 6 calculates the duty cycle of the reverse pulse other than the polarity control pulse Psw2 (polarity reversal unit) described later.

[0091] Generate a positive pulse (perform pulse control based on the calculated duty cycle) (S204): The control device 6 generates a positive pulse to generate a positive drive current id flowing into the proportional solenoid 28. The positive pulse includes a polarity control pulse Psw1 as a polarity reversal part, which reverses the current direction of the drive current id faster than the movement of the valve core 18. The pulse width of the polarity control pulse Psw1 is larger than that of other positive pulses, making it a high duty cycle pulse. The polarity reversal part in the positive pulse switches the polarity of the reversed drive current id to the positive drive current id.

[0092] Reverse pulse generation (pulse control executed according to the calculated duty cycle) (S205): Control device 6 generates a reverse pulse to generate a reverse drive current id flowing into the proportional solenoid 28. The reverse pulse includes a polarity control pulse Psw2 as a polarity reversal part, which reverses the current direction of the drive current id faster than the movement of the valve core 18. The pulse width of the polarity control pulse Psw2 is larger than that of other reverse pulses, making it a high duty cycle pulse. The polarity reversal part in the reverse pulse switches the polarity of the positive drive current id to the reverse drive current id.

[0093] Controlling the valve opening (S206): The control device 6 controls the current level of the drive current id according to the signal level of the control signal Sin, thereby controlling the valve opening.

[0094] <Polarity reversal of the drive current id, its level control, and the attraction force F>

[0095] Figure 6 Figure A illustrates a positive PWM pulse as an example of a positive pulse. This positive pulse is generated during 1 / 2 of the dithering period Td (=Td / 2), and it includes a polarity control pulse Psw1 at its beginning as a polarity reversal part. The polarity control pulse Psw1 has a certain pulse width to shorten the polarity reversal period that switches the reverse drive current id to the positive direction.

[0096] In contrast, the duty cycle of the positive PWM pulses, except for the polarity control pulse Psw1, is controlled by the control signal Sin. Figure 6 In A, a constant duty cycle is used for ease of explanation, but it can be controlled to different duty cycles according to the valve opening.

[0097] Figure 6 Figure B illustrates a reverse PWM pulse as an example of a reverse pulse. This reverse pulse is generated during half (=Td / 2) of the dithering period Td, and includes a polarity control pulse Psw2 as a polarity reversal part at the beginning of the reverse pulse. The polarity control pulse Psw2 has a certain pulse width to shorten the period of switching the positive drive current id to the reverse polarity reversal. In this embodiment, the polarity control pulses Psw1 and Psw2 have the same pulse width.

[0098] In contrast, the duty cycle of the reverse PWM pulses, except for the polarity control pulse Psw2, is controlled by the control signal Sin. Figure 6 In section B, a constant duty cycle is used for ease of explanation, but it can be controlled to different duty cycles depending on the valve opening.

[0099] Figure 6 C represents the forward or reverse flow of the drive current id. Based on the polarity control pulse Psw1, the drive current id is switched from the reverse direction to the forward direction for half the period of the dithering period Td. Similarly, based on the polarity control pulse Psw2, the drive current id is switched from the forward direction to the reverse direction for half the period of the dithering period Td.

[0100] The current level of the drive current id, which is accompanied by polarity reversal, is controlled by the duty cycle of the positive or negative PWM pulse.

[0101] Figure 6 Figure D illustrates the attractive force F acting on the movable pole 26 and the yoke 32 (fixed pole). The movable pole 26 and the yoke 32 are magnetized by energizing the proportional solenoid 28 with a drive current id that is controlled by polarity reversal. Although the poles reverse to different pairs according to half a period of the flutter period Td, the attractive force F generated between the movable pole 26 and the yoke 32 depends on the level of the drive current id.

[0102] <Effects of the first implementation method>

[0103] According to the first embodiment, any of the following effects can be obtained.

[0104] (1) Since the polarity of the drive current id is reversed at half the period of the dithering period Td (=Td / 2), the magnetic poles between the movable magnetic pole 26 and the yoke 32 based on the proportional solenoid 28 are reversed, thus canceling the residual magnetism. This polarity reversal occurs at a period faster than the opening and closing of the valve mechanism 14, so it does not affect the control of the valve opening.

[0105] (2) During the time interval of polarity reversal, the current level of the drive current id is controlled by the duty cycle of the positive PWM pulse or the reverse PWM pulse. Therefore, the valve opening of the valve mechanism 14 can be controlled by the current level of the drive current id, without being affected by the polarity reversal of the drive current id.

[0106] [Second Implementation]

[0107] Figure 7 A proportional solenoid valve system 2 according to the second embodiment is shown. Figure 7 In the structure, for and Figure 1 The same parts are labeled with the same number.

[0108] The drive unit 48 includes, for example, a power supply 64, a drive bridge circuit 66, a forward drive circuit 68-1, and a reverse drive circuit 68-2. The power supply 64 constitutes the current source for the drive current id.

[0109] The drive bridge circuit 66 has, for example, Pch-FETs (P-channel field-effect transistors) 71, 72 and Nch-FETs (N-channel field-effect transistors) 73, 74.

[0110] The forward drive circuit 68-1 receives a forward PWM pulse from the control unit 50, causing a forward drive current id to flow from the drive bridge circuit 66 to the proportional solenoid 28. Conversely, the reverse drive circuit 68-2 receives a reverse PWM pulse from the control unit 50, causing a reverse drive current id to flow from the drive bridge circuit 66 to the proportional solenoid 28. That is, in half a cycle of the dithering period Td (=Td / 2), a forward drive current id flows to the proportional solenoid 28 through the conduction of Pch-FET 72 and Nch-FET 73, and in the next half cycle of the dithering period Td (=Td / 2), a reverse drive current id flows to the proportional solenoid 28 through the conduction of Pch-FET 71 and Nch-FET 74.

[0111] The control unit 50 includes a control circuit 76, a pulse generation unit 78, a PWM generation unit 80, and a logic circuit 82. The control circuit 76 is composed of a microcomputer and includes a processor 84, a storage unit 86, and an input / output (I / O) unit 88. The processor 84 executes the control program located in the storage unit 86, performing controls such as pulse width control corresponding to the control signal Sin.

[0112] The control and control information includes the following content.

[0113] a) Control information used to generate drive current ID

[0114] b) Control information that reverses the polarity of the drive current id at a cycle faster than the movement of valve core 18.

[0115] c) Control information that controls the valve opening by the current level of the drive current id.

[0116] d) Calculation of the duty cycle of positive pulses other than polarity control pulses

[0117] e) Calculation of the duty cycle of inverse pulses other than polarity control pulses

[0118] f) Generation of a positive pulse, which includes a control pulse that switches the polarity of the reverse drive current id to positive (execution of the calculated pulse control).

[0119] g) Generation of a reverse pulse, which includes a control pulse that switches the polarity of the forward drive current id to the reverse direction (execution of the calculated pulse control).

[0120] Storage unit 86 is an example of a recording medium used to store the program of this disclosure. Storage unit 86 uses storage elements such as ROM (Read-Only Memory), RAM (Random-Access Memory), and EEPROM (Electrically Erasable Programmable Read-Only Memory) for the generation and storage of various control information.

[0121] I / O 88 is used to input the control signal Sin and generate control information.

[0122] The pulse generation unit 78 generates a clock pulse with a certain period of time, and generates a pulse with a certain period of time by dividing or multiplying the frequency of the clock pulse.

[0123] The PWM generation unit 80 has a forward PWM pulse generation function and a reverse PWM pulse generation function, generating a forward PWM pulse or a reverse PWM pulse with a duty cycle corresponding to the signal level of the control signal Sin, and outputting it to the logic circuit 82.

[0124] The logic circuit 82 receives a control pulse synchronized with half the dithering period Td from the pulse generation unit 78, and outputs a positive PWM pulse and a negative PWM pulse in sync with Td / 2. The positive PWM pulse is provided to the positive drive circuit 68-1, and the negative PWM pulse is provided to the negative drive circuit 68-2.

[0125] <Effects of the second implementation method>

[0126] According to the second embodiment, any of the following effects can be obtained.

[0127] (1) Since the polarity of the driving current id is reversed by half the period of the flutter period Td (=Td / 2), the magnetic poles between the movable magnetic pole 26 and the yoke 32 based on the proportional solenoid 28 are reversed, thus the residual magnetism can be canceled and the hysteresis characteristics can be improved.

[0128] (2) It can control the current level of the drive current id by the duty cycle of the positive PWM pulse or the negative PWM pulse during the polarity reversal time interval, and can improve the controllability of the valve opening of the valve mechanism 14 by the current level of the drive current id, without being affected by the polarity reversal of the drive current id.

[0129] [Third Implementation]

[0130] Figure 8 A proportional solenoid valve 94 according to the third embodiment is shown. Figure 8 In the structure, for and Figure 1 The same parts are labeled with the same number.

[0131] In this third embodiment, the proportional solenoid valve body 90 is the valve function part of the proportional solenoid valve 4 of the first embodiment.

[0132] The frame 92 houses the proportional solenoid valve body 90, the drive unit 48, and the control unit 50. Therefore, in this embodiment, a proportional solenoid valve 94 with integrated control function is constructed.

[0133] According to this structure, the same effect as the first or second embodiment can be obtained.

[0134] [Fourth Implementation]

[0135] Figure 9 A hot water supply device according to the fourth embodiment is shown. Figure 9 The structure shown is an example, and this disclosure is not limited to this structure.

[0136] In the heat source device used in a hot water supply system that heats and provides hot water, a proportional valve is used to control the supply of fuel gas according to the hot water demand. Among these proportional valves, a proportional solenoid valve is known to control the valve opening by energizing a proportional solenoid.

[0137] The burner, for example, has two different burner sections, and can select the combustion mode as follows: when the hot water demand is low, only one burner section burns (primary combustion); when the hot water demand is moderate, only the other burner section burns (secondary combustion); and when the hot water demand increases, both burner sections burn simultaneously (tertiary combustion). When fuel control is performed using a proportional solenoid valve to cope with such increases and decreases in hot water demand, hysteresis exists in primary, secondary, and tertiary combustion. This hysteresis causes differences in valve opening under the same drive current, resulting in differences in the CO and NOx values ​​produced during combustion, i.e., changes in the combustion state. This change in combustion state is significant in primary combustion, where the amount of combustible gas is small.

[0138] The following issues exist: the hysteresis characteristic affects the hot water temperature, causing a deviation between the hot water temperature and the hot water supply demand.

[0139] Furthermore, the following issues exist: setting up the secondary pressure to mitigate the effects of hysteresis characteristics on the production line is laborious and requires a significant amount of time.

[0140] Therefore, in this embodiment, an example of a structure is shown that improves control characteristics in fuel control by reducing or avoiding the influence of residual magnetism on the proportional solenoid valve.

[0141] The hot water supply device 102 is an example of a heat source device disclosed herein. The hot water supply device 102 has a hot water supply port 106, a water supply port 108, a fuel gas port 110, a drain port 112, and an exhaust port 114 in a frame 104. The frame 104 is disposed on, for example, a wall of a building.

[0142] A hot water supply pipe 116, supplying hot water HW to the demand area, is connected to the hot water supply port 106. A water supply pipe 118, such as a tap water pipe (not shown), is connected to the water supply port 108 for supplying water W. A gas pipe 120, supplying fuel gas G, is connected to the fuel gas port 110. The drain port 112 is used to discharge the wastewater D generated by the heat exchange due to combustion heat. The exhaust port 114 discharges the combustion exhaust gas after heat exchange.

[0143] A combustion chamber 122 is provided in the center of the frame 104. The combustion chamber 122 is equipped with a burner 124, an igniter 126, a spark plug 127, a flame rod 128, an air supply fan 130, a primary heat exchanger 132, a secondary heat exchanger 134, and a drainage receiving section 136.

[0144] The burner 124 may have, for example, a first burner section 124-1 and a second burner section 124-2 with different burner surfaces, and is capable of combustion only in burner section 124-1, combustion only in burner section 124-2, or simultaneous combustion of burner sections 124-1 and 124-2. When a hot water demand is generated, the fuel gas G of the burner 124 is ignited by the igniter 126 and the spark plug 127, and the flame rod 128 detects the combustion of the fuel gas G in the burner 124.

[0145] The air supply fan 130 draws combustion air into the combustion chamber 122 during combustion in the burner 124. The primary heat exchanger 132 heats the water supply W by exchanging heat between the sensible heat of the combustion exhaust from the upstream side and the water supply W. The secondary heat exchanger 134 heats the water supply W by exchanging heat between the latent heat of the combustion exhaust from the downstream side and the water supply W. The secondary heat exchanger 134 is located upstream of the primary heat exchanger 132 in the water supply W passage and is connected in series with the primary heat exchanger 132 via a connecting pipe 135.

[0146] The drainage receiving section 136 receives the drainage D generated by the heat exchange of the secondary heat exchanger 134 and directs it to the drainage tank 138. The drainage D accumulated in the drainage tank 138 flows from the drainage discharge pipe 140 to the drainage port 112.

[0147] Fuel gas G supplied to fuel gas port 110 is guided by gas supply pipe 142 to valve unit 144, then from gas supply pipe 142-1 to burner section 124-1, and from gas supply pipe 142-2 to burner section 124-2. Valve unit 144 has the functions of a main valve for switching fuel gas G to a supply state or a cut-off state, a proportional valve for adjusting the supply of fuel gas G according to hot water demand, and a switching valve for switching the supply of fuel gas G to burner sections 124-1 and 124-2.

[0148] A water supply pipe 146 is provided between the water supply port 108 and the secondary heat exchanger 134, supplying water W to the secondary heat exchanger 134. A temperature sensor 148, a water flow sensor 150, and a water mixing control valve 152 are installed on the water supply pipe 146. The temperature sensor 148 detects the temperature of the water supply W. The water flow sensor 150 detects the flow rate of the water supply in the water supply pipe 146. The water mixing control valve 152 controls the mixing of the water supply W with the hot water HW heated by the primary heat exchanger 132 and the secondary heat exchanger 134.

[0149] A hot water outlet pipe 154 is located between the hot water supply port 106 and the primary heat exchanger 132, with a hot water outlet pipe 154 on the primary heat exchanger 132 side and a hot water supply pipe 156 on the hot water supply port 106 side. A temperature sensor 158 is installed on the hot water outlet pipe 154. A water control valve 160 is installed between the hot water outlet pipe 154 and the hot water supply pipe 156, and a bypass pipe 162 is connected between the water control valve 160 and the water mixing control valve 152. The water control valve 160 controls the amount of hot water output from the hot water outlet (HW). A temperature sensor 164 is installed on the hot water supply pipe 156.

[0150] The control device 166 obtains the detected water volume from the water volume sensor 150, the detected temperature indicating the supply water temperature from the temperature sensor 148, the detected temperature indicating the hot water temperature from the temperature sensor 158, and the detected temperature indicating the supply hot water temperature from the temperature sensor 164. The control device 166 uses this detection information to control the amount of combustion gas through the valve unit 144, thereby achieving hot water supply at the set temperature.

[0151] Figure 10 The front of valve unit 144 is shown. Figure 11 It shows along Figure 10 The cut end face obtained by cutting the XI-XI line, and, Figure 12 It shows along Figure 10 The cut end face is obtained by cutting the XII-XII line. Figures 10 to 12 The structure shown is an example, and this disclosure is not limited to this structure.

[0152] The valve unit 144 has an inlet port 168, a first outlet port 170-1, and a second outlet port 170-2 within the valve unit frame 167. A solenoid valve 172 is installed at the inlet port 168. A solenoid valve 174 is installed at the outlet port 170-1. A solenoid valve 176 is installed at the outlet port 170-2. A proportional solenoid valve 4 is located between the solenoid valves 172 and 174 / 176.

[0153] According to the valve unit 144, such as Figure 13 As shown, if solenoid valve 172 and solenoid valve 174 are controlled to the open state, outlet port 170-1 is selected. In this state, if the valve opening of proportional solenoid valve 4 is controlled, the amount of fuel gas flowing out from outlet port 170-1 can be controlled.

[0154] In addition, such as Figure 14 As shown, solenoid valve 172 and the two solenoid valves 174 and 176 are controlled to be in the open state, and the two outlet ports 170-1 and 170-2 are selected. In this state, if the valve opening of the proportional solenoid valve 4 is controlled, the amount of fuel gas flowing out from the two outlet ports 170-1 and 170-2 can be controlled.

[0155] Alternatively, the valve unit 144 mounted on the hot water supply device 102 can, for example, use the structure of the proportional solenoid valve system 2, valve drive mechanism 62, and proportional solenoid valve 94 shown in the first to third embodiments.

[0156] Hot water supply control

[0157] Figure 15 The hot water supply control of the hot water supply device 102 is shown. The control process of this hot water supply control includes: generating a hot water demand (S301), opening solenoid valves 172, 174, and 176 (S302), igniting the burner 124 (S303), controlling the amount of fuel gas according to the water volume (S304), controlling the hot water temperature to the set temperature (S305), determining the end of the hot water demand (S306), closing solenoid valves 172, 174, and 176 (S307), and extinguishing the burner 124 (S308), etc.

[0158] Hot water demand is generated (S301): Hot water demand is generated by, for example, the opening of a hot water valve connected to the hot water supply pipe 116. This hot water demand causes water supply W to be supplied from the water supply pipe 118. This water supply W is detected by a water flow sensor 150, and the detection output of the water flow sensor 150 is taken into the control device 166.

[0159] Opening solenoid valves 172, 174, and 176 (S302): In response to a demand for hot water, control device 166 opens solenoid valves 172, 174, and 176. As a result, fuel gas G flows to burner 124.

[0160] Ignite burner 124 (S303): When a demand for hot water is generated, control device 166 starts igniter 126 and ignites burner 124 through spark plug 127.

[0161] Fuel gas quantity control based on water quantity (S304): Control device 166 takes the water quantity detected by water quantity sensor 150, the detection signal from temperature sensor 148, etc., as the control signal for fuel gas quantity. Control device 166 controls the opening degree of proportional solenoid valve 4 of valve unit 144.

[0162] Controlling the hot water supply temperature to the set temperature (S305): The control device 166 can set the desired hot water supply temperature through initial settings or by the user. Receiving temperature readings from temperature sensors 148, 158, and 164, and water flow readings from water flow sensor 150, the control device 166 controls the hot water supply temperature to the set temperature to provide hot water.

[0163] Determining the end of hot water demand (S306): The hot water supply volume is detected by the water flow sensor 150. The control device 166 determines the end of hot water demand based on the water flow detected by the water flow sensor 150.

[0164] Closing solenoid valves 172, 174, and 176 (S307): Control device 166 closes solenoid valves 172, 174, and 176 upon termination of hot water supply demand. This stops the supply of fuel gas G to burner 124.

[0165] Extinguishing burner 124 (S308): Burner 124 is extinguished by stopping the supply of fuel gas G to burner 124.

[0166] <Effects of the 4th Implementation>

[0167] According to the fourth embodiment, any of the following effects can be obtained.

[0168] (1) It can achieve the same effect as the first to third embodiments.

[0169] (2) It can reduce or avoid the influence of residual magnetism in the proportional solenoid valve 4. Therefore, the difference between the valve opening relative to the driving current id in the direction of increasing and decreasing fuel gas G is small, which can prevent the difference between increasing and decreasing fuel gas G.

[0170] (3) Changes in the combustion state are suppressed, and the combustion state can be stabilized.

[0171] (4) The controllability of hot water supply is improved, which can prevent the hot water temperature from deviating in the direction of increase and decrease of fuel gas G.

[0172] (5) In the production line, it is easy to set the secondary pressure of the gas after the proportional solenoid valve, which can improve the production efficiency of the hot water supply device 102.

[0173] [Fifth Implementation]

[0174] Figure 16 The valve unit 144 and control system 200 of the fifth embodiment are shown. Figure 16 In the structure, for and Figure 1 and Figure 7 The same parts are labeled with the same number.

[0175] Figure 7 The proportional solenoid valve system 2 shown has a drive unit 48 and a control unit 50 in the control device 6. In contrast, in this control system 200, for example... Figure 16 As shown, the valve unit frame 167 contains a proportional solenoid valve 4, a drive unit 48, and a control unit 50. Furthermore, a control device 166 is located outside the valve unit 144.

[0176] The control device 166 is, for example, a computer, and includes a processor 202, a storage unit 204, and I / O 206. The processor 202 executes a hot water supply control program stored in the storage unit 204. This information processing includes controlling the hot water supply temperature and other parameters using detection information from water flow sensors 150, temperature sensors 148, 158, 164, etc.

[0177] In this control device 166, the processor 202 and the processor 84 described above can be shared, the storage unit 204 and the storage unit 86 described above can be shared, and the I / O 206 and I / O 88 can be shared.

[0178] <Effects of the 5th Implementation>

[0179] Based on this structure, any of the following effects can be obtained.

[0180] (1) It can achieve the same effect as the first to fourth embodiments.

[0181] (2) It can integrate the control functions of valve unit 144 and proportional solenoid valve 4, realize the compactness of control device 166, and make maintenance easier.

[0182] [Experimental Results]

[0183] exist Figure 17 In the diagram, the horizontal axis represents time, and the vertical axis represents valve opening or gas secondary pressure. This illustrates the operating characteristics of proportional solenoid valves 4 and 94 driven by a drive current id without polarity reversal. The valve opening of proportional solenoid valves 4 and 94 is proportional to their operating characteristics in relation to the gas secondary pressure.

[0184] When the proportional solenoid 28 is energized with a drive current id without polarity reversal, the influence of residual magnetism cannot be eliminated because the drive current id is unidirectional. That is, with a drive current id in the same direction as the residual magnetism, magnetization is emphasized; conversely, with a drive current id in the opposite direction, magnetization based on the drive current id is impaired in order to counteract the residual magnetism. As a result, the hysteresis h between the control signal Sin and the valve opening or gas secondary pressure has a significant effect.

[0185] exist Figure 18 Similarly, the horizontal axis represents time, and the vertical axis represents valve opening or secondary gas pressure, showing the operating characteristics of proportional solenoid valves 4 and 94 driven by a drive current id accompanied by polarity reversal.

[0186] When the proportional solenoid 28 is energized with a drive current id accompanied by polarity reversal, the residual magnetism is counteracted by the drive current id through polarity reversal, resulting in a relationship between the drive current id and the valve opening or gas secondary pressure without the influence of residual magnetism. As a result, the effect of the hysteresis h between the control signal Sin and the valve opening or gas secondary pressure is improved to a negligible level.

[0187] [Other Implementation Methods]

[0188] The following are variations of the implementation methods described above.

[0189] (1) In the above embodiment, PWM control is exemplified, but control other than PWM control can also be used to control the proportional solenoid valve.

[0190] (2) Set the reversal period of the drive current id to half of the chatter period Td, but it is only necessary to be faster than the moving speed of the valve core 18, and is not limited to the period of the implementation method.

[0191] (3) In the above embodiment, a polarity control pulse is exemplified as a polarity reversal unit included in the forward or reverse pulse. However, in addition to using a pulse generated in the PWM control, a polarity reversal pulse generated separately from the PWM control can also be used. The polarity reversal pulse only needs to have a period that includes the polarity reversal timing most suitable for the drive current id and a pulse width that is set to the optimal time width.

[0192] (4) As an example of a heat source device, a hot water supply device is shown, but it may also be replaced by a reheating hot water supply device, a heating hot water supply device, etc.

[0193] As explained above, the most preferred embodiments of the structure of the present invention have been described. The present invention is not limited to the above description, and those skilled in the art can make various modifications and alterations based on the spirit of the invention as described in the claims or the specific embodiments. Such modifications and alterations are naturally included within the scope of the present invention.

[0194] Industrial availability

[0195] This invention can reverse the magnetic pole relationship between the movable magnetic pole and the fixed magnetic pole (yoke) by driving current to cancel residual magnetism, and can drive the valve mechanism with magnetic force unaffected by residual magnetism, thereby improving hysteresis characteristics.

[0196] Label Explanation

[0197] 2: Proportional solenoid valve system; 4, 94: Proportional solenoid valve; 6, 166: Control device; 8: Fluid path; 10: Valve chamber; 12-1: Inlet port; 12-2: Outlet port; 14: Valve mechanism; 16: Valve seat; 18: Valve core; 20: Shaft; 22: Support component; 24: Diaphragm; 26: Movable magnetic pole; 28: Proportional solenoid; 30: Coil; 32: Yoke; 34: Coil frame; 36: Support frame; 38: Spatial part; 40: Support component; 42: Spring support part; 44: Spring insertion part; 46: Spring; 48: Drive part; 50: Control part; 51 52: Holding frame; 54: Conical face; 56: Valve port; 58: Recess; 60: Convex; 62: Valve drive mechanism; 64: Power supply; 66: Drive bridge circuit; 68-1: Forward drive circuit; 68-2: Reverse drive circuit; 71, 72: Pch-FET; 73, 74: Nch-FET; 76: Control circuit; 78: Pulse generation unit; 80: PWM generation unit; 82: Logic circuit; 84, 202: Processor; 86, 204: Storage unit; 88, 206: Input / output unit (I / O); 90: Proportional solenoid valve body; 92, 104: Frame; 102: Hot water supply device; 106: Hot water supply port; 108: Water supply port; 110: Fuel gas port; 112: Drain port; 114: Exhaust port; 116: Hot water supply pipe; 118: Water supply pipe; 120: Gas pipe; 122: Combustion chamber; 124: Burner; 124-1, 124-2: Burner section; 126: Igniter; 127: Spark plug; 128: Flame rod; 130: Gas supply fan; 132: Primary heat exchanger; 134: Secondary heat exchanger; 135: Connecting pipe; 136: Drain receiving section; 138: Drainage tank; 140: Drainage pipe; 142: Gas supply pipe; 142-1, 142-2: Gas supply pipe; 144: Valve unit; 146: Water supply pipe; 148, 158, 164: Temperature sensor; 150: Water volume sensor; 152: Water mixing control valve; 154: Hot water outlet pipe; 156: Hot water supply pipe; 160: Water control valve; 162: Bypass pipe; 167: Valve unit frame; 168: Inlet port; 170-1, 70-2: Outlet port; 172, 174, 176: Solenoid valve; 200: Control system; Q: Fluid; G: Fuel gas.

Claims

1. A control method for a proportional solenoid valve, wherein the valve opening degree of the proportional solenoid valve is controlled by the excitation of a proportional solenoid, characterized in that, The control method for this proportional solenoid valve includes the following steps: A drive current is generated to excite the proportional solenoid; A positive pulse is generated, which includes a first polarity reversal part that reverses the polarity of the reversed drive current to the positive polarity and a positive PWM pulse following the first polarity reversal part; A reverse pulse is generated, which includes a second polarity reversal part that reverses the polarity of the positive drive current to the reverse polarity and a reverse PWM pulse following the second polarity reversal part; The polarity of the drive current is reversed by using the positive pulse and the reverse pulse at a cycle faster than the movement of the valve core. as well as The valve opening is controlled by the current level of the drive current, which depends on the duty cycle of the positive or negative PWM pulse.

2. The control method for the proportional solenoid valve according to claim 1, characterized in that, The control method for the proportional solenoid valve also includes the following steps: Control the duty cycle of the positive PWM pulse; and The duty cycle of the reverse PWM pulse is controlled.

3. A proportional solenoid valve system, characterized in that, This proportional solenoid valve system has: A proportional solenoid valve, the valve opening degree of which is controlled by the excitation of a proportional solenoid; The driving unit generates a driving current that excites the proportional solenoid and causes the driving current to flow into the proportional solenoid. as well as The control unit has a logic circuit that generates a positive pulse, which includes a first polarity reversal part that reverses the polarity of the reversed drive current to the positive direction and a positive PWM pulse following the first polarity reversal part. The logic circuit also generates a reverse pulse, which includes a second polarity reversal part that reverses the polarity of the positive drive current to the reverse direction and a reverse PWM pulse following the second polarity reversal part. The control unit uses the positive and reverse pulses to reverse the polarity of the drive current at a period faster than the movement of the valve core, and controls the valve opening by the current level of the drive current, which depends on the duty cycle of the positive or reverse PWM pulse.

4. The proportional solenoid valve system according to claim 3, characterized in that, The proportional solenoid valve system also has: The pulse width control unit controls the duty cycle of the positive PWM pulse or the duty cycle of the reverse PWM pulse.

5. A control device for a proportional solenoid valve, characterized in that, The control device for this proportional solenoid valve has the following features: The drive unit generates a drive current that excites a proportional solenoid that controls the valve opening by energizing it, and causes the drive current to flow to the proportional solenoid. as well as The control unit includes logic circuitry that generates a positive pulse containing a first polarity reversal portion that reverses the polarity of the reversed drive current to positive and a positive PWM pulse following the first polarity reversal portion. The logic circuitry also generates a reverse pulse containing a second polarity reversal portion that reverses the polarity of the positive drive current to negative and a reverse PWM pulse following the second polarity reversal portion. The control unit uses the positive and reverse pulses to reverse the polarity of the drive current at a period faster than the movement of the valve spool, and controls the valve opening by the current level of the drive current, which depends on the duty cycle of the positive or reverse PWM pulse.

6. The control device for the proportional solenoid valve according to claim 5, characterized in that, The control unit includes: The pulse width control unit controls the duty cycle of the positive PWM pulse or the duty cycle of the reverse PWM pulse.

7. A recording medium storing a program for valve opening control implemented by a computer, wherein, The program for controlling the valve opening performs the following functions through the computer: Generate control information for generating the drive current used to excite the proportional solenoid; A positive pulse is generated, which includes a first polarity reversal part that reverses the polarity of the reversed drive current to the positive polarity and a positive PWM pulse following the first polarity reversal part; A reverse pulse is generated, which includes a second polarity reversal part that reverses the polarity of the positive drive current to the reverse polarity and a reverse PWM pulse following the second polarity reversal part; Control information is generated that reverses the polarity of the drive current using the positive pulse and the reverse pulse at a cycle faster than the movement of the valve core. as well as Control information is generated to control the valve opening by the current level of the drive current, which depends on the duty cycle of the positive PWM pulse or the reverse PWM pulse.

8. The recording medium according to claim 7, wherein, The valve opening control program also performs the following functions through the computer: Control the positive PWM pulse; and The inverse PWM pulse is controlled.

9. A proportional solenoid valve, characterized in that, This proportional solenoid valve has: The valve mechanism is controlled by the excitation of a proportional solenoid; A driving unit that allows a driving current to flow into the proportional solenoid; and The control unit includes logic circuitry that generates a positive pulse containing a first polarity reversal portion that reverses the polarity of the reversed drive current to the positive direction and a positive PWM pulse following the first polarity reversal portion. The logic circuitry also generates a reverse pulse containing a second polarity reversal portion that reverses the polarity of the positive drive current to the reverse direction and a reverse PWM pulse following the second polarity reversal portion. The control unit uses the positive and reverse pulses at a period faster than the movement of the valve core to reverse the polarity of the drive current to counteract residual magnetism, and adjusts the valve opening by the current level of the drive current, which depends on the duty cycle of the positive or reverse PWM pulse.

10. A proportional solenoid valve, characterized in that, This proportional solenoid valve has: Valve mechanism; A proportional solenoid, which controls the valve mechanism by excitation; The driving unit generates a driving current that excites the proportional solenoid and causes the driving current to flow into the proportional solenoid. as well as The control unit includes logic circuitry that generates a positive pulse containing a first polarity reversal portion that reverses the polarity of the reversed drive current to the positive direction and a positive PWM pulse following the first polarity reversal portion. The logic circuitry also generates a reverse pulse containing a second polarity reversal portion that reverses the polarity of the positive drive current to the reverse direction and a reverse PWM pulse following the second polarity reversal portion. The control unit uses the positive and reverse pulses to reverse the polarity of the drive current at a period faster than the movement of the valve spool, and controls the valve opening by the current level of the drive current, which depends on the duty cycle of the positive or reverse PWM pulse.

11. The proportional solenoid valve according to claim 9 or 10, characterized in that, The control unit includes: The pulse width control unit controls the duty cycle of the positive PWM pulse or the duty cycle of the reverse PWM pulse.

12. A heat source device, characterized in that, The heat source device has the following features: A burner, which ignites fuel gases; A proportional solenoid valve, the valve opening of which is controlled by the excitation of a proportional solenoid, allows fuel gas supplied to the burner to pass through; The driving unit generates a driving current that excites the proportional solenoid and causes the driving current to flow into the proportional solenoid. as well as The control unit has a logic circuit that generates a positive pulse, which includes a first polarity reversal part that reverses the polarity of the reversed drive current to the positive direction and a positive PWM pulse following the first polarity reversal part. The logic circuit also generates a reverse pulse, which includes a second polarity reversal part that reverses the polarity of the positive drive current to the reverse direction and a reverse PWM pulse following the second polarity reversal part. The control unit uses the positive and reverse pulses to reverse the polarity of the drive current at a period faster than the movement of the valve core, and controls the valve opening by the current level of the drive current, which depends on the duty cycle of the positive or reverse PWM pulse.

13. The heat source device according to claim 12, characterized in that, The heat source device also has: A heat exchanger that allows the combustion heat of the fuel gas to exchange with the fluid being heated; as well as A temperature sensor detects the temperature of the heated fluid. The control unit receives the detected temperature of the heated fluid and controls the valve opening.

14. The heat source device according to claim 12 or 13, characterized in that, The control unit has: The pulse width control unit controls the duty cycle of the positive PWM pulse or the duty cycle of the reverse PWM pulse.

15. A control method for a heat source device, wherein a proportional solenoid valve is used in the control of fuel gas, characterized in that, The control method for this heat source device includes the following steps: Generate a drive current to drive the proportional solenoid valve; This causes the fuel gas that has passed through the proportional solenoid valve to burn; A positive pulse is generated, which includes a first polarity reversal part that reverses the polarity of the reversed drive current to the positive polarity and a positive PWM pulse following the first polarity reversal part; A reverse pulse is generated, which includes a second polarity reversal part that reverses the polarity of the positive drive current to the reverse polarity and a reverse PWM pulse following the second polarity reversal part; The polarity of the drive current is reversed by using the positive pulse and the reverse pulse at a cycle faster than the movement of the valve core. as well as The valve opening is controlled by the current level of the drive current, which depends on the duty cycle of the positive or negative PWM pulse.

16. The control method for the heat source device according to claim 15, characterized in that, The control method for the heat source device also includes the following steps: The combustion heat of the fuel gas is exchanged with the heat of the heated fluid; and The temperature of the heated fluid is detected, and the valve opening is controlled based on the detected temperature of the heated fluid.

17. The control method for the heat source device according to claim 15 or 16, characterized in that, The control method for the heat source device also includes the following steps: Control the duty cycle of the positive PWM pulse; and The duty cycle of the reverse PWM pulse is controlled.

18. A recording medium storing a control program for a heat source device implemented via a computer, wherein, The control program for this heat source device performs the following functions through the computer: Generate control information for generating the drive current used to excite the proportional solenoid; A positive pulse is generated, which includes a first polarity reversal part that reverses the polarity of the reversed drive current to the positive polarity and a positive PWM pulse following the first polarity reversal part; A reverse pulse is generated, which includes a second polarity reversal part that reverses the polarity of the positive drive current to the reverse polarity and a reverse PWM pulse following the second polarity reversal part; Control information is generated that reverses the polarity of the drive current using the positive pulse and the reverse pulse at a cycle faster than the movement of the valve core. as well as Control information is generated to control the valve opening by the current level of the drive current, which depends on the duty cycle of the positive PWM pulse or the reverse PWM pulse.

19. The recording medium according to claim 18, wherein, The control program for the heat source device also performs the following functions through the computer: Control the duty cycle of the positive PWM pulse; and The duty cycle of the reverse PWM pulse is controlled.

20. A control device for controlling the amount of combustion gases, characterized in that, The control device has: The drive unit generates a drive current that excites a proportional solenoid that controls the valve opening by energizing it, and causes the drive current to flow to the proportional solenoid. as well as The control unit has a logic circuit that generates a positive pulse, which includes a first polarity reversal part that reverses the polarity of the reversed drive current to the positive direction and a positive PWM pulse following the first polarity reversal part. The logic circuit also generates a reverse pulse, which includes a second polarity reversal part that reverses the polarity of the positive drive current to the reverse direction and a reverse PWM pulse following the second polarity reversal part. The control unit uses the positive and reverse pulses to reverse the polarity of the drive current at a period faster than the movement of the valve core, and controls the valve opening by the current level of the drive current, which depends on the duty cycle of the positive or reverse PWM pulse.

21. The control device according to claim 20, characterized in that, The control unit has: The pulse width control unit controls the duty cycle of the positive PWM pulse or the duty cycle of the reverse PWM pulse.

22. A hot water supply device, characterized in that, The hot water supply device has any one of the heat source device as described in claim 12 or 13, the recording medium as described in claim 18 or 19, and the control device as described in claim 20 or 21. The hot water supply device heats the supply water and provides hot water at a supply water temperature that has been heated to a set temperature.

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