Ignition device

Abstract

To solve the problems that when power supplied to an igniter is large, spark discharge generated by the igniter becomes large, when spark discharge is generated, electromagnetic wave noise is generated, and when spark discharge is larger, the larger the electromagnetic wave noise becomes, and therefore, there is a trouble that unnecessary electromagnetic wave noise is generated due to supply of power more than necessary to the igniter.SOLUTION: An ignition device performs ignition by memorizing power in previous success of ignition as effective power to be supplied to the igniter when ignition is failed, with power changing means for reducing power to be supplied to an igniter less than that at a previous ignition time, and supplying to the igniter without reducing the effective power by the power changing means.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an ignition device that ignites fuel by spark discharge.

Background Art

[0002] In the case of a gas burner, flammable gas is ejected from the gas burner, and in the case of an oil burner, petroleum serving as fuel is ejected in an atomized state from a nozzle, and then spark discharge is generated by an igniter to perform ignition. Since the difficulty of ignition varies depending on the type of fuel, to ensure reliable ignition regardless of which fuel expected to be used on the market is employed, the igniter is configured to be supplied with more power than necessary (see, for example, Patent Document 1).

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

[0012] , Figure 2)

Summary of the Invention

Problem to be Solved by the Invention

[0004] When the power supplied to the igniter is large, the spark discharge generated by the igniter also increases. Electromagnetic noise is generated when spark discharge occurs, and the larger the spark discharge, the greater the electromagnetic noise. Therefore, supplying excessive power to the igniter has the problem of generating unnecessary electromagnetic noise.

[0005] In view of the above problems, an object of the present invention is to provide an ignition device capable of suppressing the generation of electromagnetic noise as much as possible by supplying the minimum necessary power to an igniter.

Means for Solving the Problem

[0006] To solve the above problems, the present invention provides an ignition device in which an igniter is placed near a burner from which a combustible fuel is ejected, and power is supplied to the igniter to generate a spark discharge and ignite the fuel, wherein the power supplied to the igniter is increased from the previous ignition In stages A power reduction mechanism, and in the event of ignition failure, the power used during the previous successful ignition is supplied to the igniter as the effective power. A means to restore it, and if ignition is successful and the above-mentioned power does not change for a predetermined number of consecutive times, from the next ignition onward, The above-mentioned power modification means A control means that stops the reduction of power by the above and maintains the actual power, It is characterized by having the following features.

[0007] Even if the initial setting is to supply a large amount of power to the igniter, the power will be gradually reduced during use, and the ignition will continue using the minimum necessary power. [Effects of the Invention]

[0008] As is clear from the above explanation, the present invention allows the power supplied to the igniter to be set to the minimum necessary, thereby suppressing the generation of electromagnetic noise as much as possible. [Brief explanation of the drawing]

[0009] [Figure 1] A diagram showing the configuration of one embodiment of the present invention. [Figure 2] Flowchart for adjusting the power for ignition [Figure 3] Figure showing an example of how to determine the N value. [Modes for carrying out the invention]

[0010] Referring to Figure 1, 1 is an igniter, and this igniter 1 is supplied with power from the drive circuit 11 to generate a spark discharge between it and the metal nozzle 2. The drive circuit 11 converts the power from the power supply 12 into a high voltage and supplies it to the igniter 1. igniter The power supplied to unit 1 can be increased or decreased in multiple stages.

[0011] The nozzle 2 is configured to receive petroleum fuel from the tank 22 under pressure from the pump 21. When the ignition is activated by the ignition button (not shown), the ignition sequence is activated, the pump 21 operates, and petroleum fuel is ejected from the nozzle 2 in a mist. At this point, power is supplied to the igniter 1, a spark discharge is generated between the nozzle 2 and the igniter 1, and the mist of petroleum fuel ejected from the nozzle 2 is ignited.

[0012] Referring to Figure 2, when the ignition operation is performed as described above (S1), the N value is retrieved from the memory unit in the drive circuit 11 (S2). This N value is set to correspond to the amount of power supplied to the igniter 1, and the larger the N value, the more power is supplied to the igniter 1. In this embodiment, as will be described later, it is set to 5 levels (0 to 5). Initially, the maximum output (MAX) value of "5" is stored in the memory unit as the N value.

[0013] In other words, when the ignition operation is first performed, the igniter 1 is supplied with the maximum amount of power to start the ignition sequence (S3). Once the ignition sequence has started, if ignition is confirmed within a predetermined time, it is judged to be a successful ignition; however, if ignition does not occur within the predetermined time, it is not judged to be a successful ignition (S4).

[0014] During the initial ignition operation, as described above, the maximum power is supplied to igniter 1 when N=5, so ignition is always successful. However, if the ignition operation is performed with N=2, for example, ignition may fail. In that case, the ignition sequence is executed again with a new N value that is the original N value plus 1 (S5, S3).

[0015] If ignition is successful, the system checks whether the N value at the time of ignition has changed from the previous N value (S6), subtracts 1 from the previous N value to obtain the new N value (S7), and waits in preparation for the next ignition operation. Incidentally, since there is no previous N value at the time of the first ignition, the process proceeds from S6 to S7.

[0016] Further, at the first ignition operation, N=5 at step S6; if ignition is successful at the second ignition operation, N=4 at step S6. Furthermore, if ignition is also successful at the third ignition operation, N=3 at step S6, and N is set to 2 in the subsequent step S7.

[0017] If ignition cannot be achieved when N=2, N is returned to 3 in step S5, so ignition succeeds during the re-ignition sequence and N=3 at step S6. N becomes 2 again in the next step S7, but ignition cannot be achieved as it is, so N=3 at step S6 when the next ignition operation is performed.

[0018] Here, if the N value does not change for, for example, three consecutive times in step S6, that is, if N=3 for three consecutive times in the above example, step S7 is skipped to prepare for the next ignition operation. For this reason, the N value is fixed at 3 thereafter.

[0019] As shown in FIG. 3, this N value may be set such that the maximum power is 5 and the state with no supplied power is 0 as shown on the left side; or as shown on the right side, the maximum power is 5, 60% power is set as 0, and the power may be divided into five stages. Further, when dividing into five stages, the division may be equal as illustrated, but it is not necessarily required to divide equally.

[0020] It should be noted that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the scope of the gist of the present invention. Description of Reference Numerals

[0021] 1 Igniter 2 Nozzle 11 Drive circuit 12 Power supply 21 Pump 22 Tank

Claims

[Claim 1] In an ignition system in which an igniter is placed near a burner from which a flammable fuel is ejected, and power is supplied to the igniter to generate a spark discharge and ignite the fuel, A power changing means for gradually reducing the power supplied to the above-mentioned ignition device compared to the previous ignition, A means to restore the power supplied to the igniter as the active power when ignition fails, using the power from the previous successful ignition. If ignition is successful and the above-mentioned effective power does not change for a predetermined number of consecutive times, a control means that stops reducing the power by the power changing means and maintains the above-mentioned effective power from the next ignition onward, An ignition device characterized by being equipped with the following features.

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