JPH02263012A - Combustion controller - Google Patents

Abstract

PURPOSE:To make it possible for a user to find out a breaking of wire of an ignition heater by detecting the electric current flowing though the ignition heater in starting preheating right after starting the operation and displaying the abnormality by an optical element when the electric current that is passing through the heater is not detected. CONSTITUTION:A microcomputer 12 starts the operation of a combustion device by its manipulation by the user. And right after this its output 14 is put to 'H' and a relay 3 is turned ON. With this an ignition heater 2 is in the state of being energized by electric current and it is in the mode of preheating. When the ignition heater 2 is normal, the A.C., IAC is over IS and the input 13 to the microcomputer 12 detects 'L'. If the ignition heater 2 has a breaking of wire, the A.C., IAC is not generated so that the input 13 to the microcomputer 12 becomes 'H', and the microcomputer 12 judges thereby that an abnormality is in the ignition heater and brings its output 14 to 'L' in order to stop the operation forcibly and puts OFF the relay 3 and the electric current to the ignition heater 2 is stopped, and at the same time by putting the output 18 to 'H' a transistor 9 is turned ON and a LED 20 is lighted. Accordingly the user is able to judge the stopping of the operation in a short time and identify the breaking of wire in the ignition heater.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion device, such as a pot-type combustor, in which a burner section is preheated and ignited by an ignition heater, and particularly to its electrical control.

Conventional technology Conventionally, when igniting a pot-type combustion machine, the burner section is preheated with an ignition heater, and then when igniting, fuel is supplied with a fuel supply device such as a fuel pump, and ignition is performed using the heat of the ignition heater. ing. In this case, if the ignition heater breaks, current will not flow to the ignition heater, and this will be detected by a current transformer, etc., and the fuel pump will be stopped to cut off the fuel supply. had been stopped. (Jitko Sho 63-446
However, when the above-mentioned combustion control device is used, preheating and ignition operations are performed after the user gives an operating instruction, and when ignition is completed for a certain period of time, the combustion control device is used. Since the operation is stopped using a separate flame detection means, the user has to wait for the preheating and ignition time to determine whether to stop the operation after receiving the operation instruction, which takes a considerable amount of time. It ends up. Furthermore, the stoppage of operation occurs due to the non-formation of a flame, and the user has the disadvantage that it is impossible to determine if the ignition heater is disconnected.

Means to Solve the Problem Immediately after the start of operation, when the ignition heater is energized to start preheating, the energizing current flowing through the ignition heater is detected, and when the energizing current is detected, the preheating is performed normally and the mode is shifted to the ignition mode. On the contrary, when no current is detected, the operation is stopped and the abnormality is indicated by a separate optical element.

As a result, if the ignition heater is disconnected, the user can determine whether the operation has been forced to stop immediately after issuing a driving instruction, and can also identify the cause of the forced stop, which is the disconnection of the ignition heater.

Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a control circuit according to the present invention. 1 is a commercial power supply. Reference numeral 2 denotes an ignition heater, which is connected to the commercial power source 1 via a normally open contact of a relay 3 . Reference numeral 4 denotes a fuel pump, which is connected to the commercial power source 1 via a normally open contact of a relay 5 .

Reference numeral 6 denotes an isolation transformer, whose primary side is connected to the commercial power supply 1 and whose secondary side is connected to the constant voltage power supply circuit 7, respectively.

The output of the constant voltage power supply circuit 7 is supplied as a power source for an electronic control circuit to be described later. Part A is a heater current detection part, and 8, which serves as its input, is a current transformer, which is provided so that a line for supplying current to the ignition heater 2 passes through the coil. The coil output is rectified by diode 9,
After being smoothed by the capacitor 10, the transistor 11 is driven, and the output of the 1-transistor 11 is input to the input 1 of the microcomputer 12.
3.

FIG. 2 shows the characteristics with respect to the alternating current IAC supplied to the ignition heater 2, where the DC voltage smoothed by the capacitor 10 is □, and the voltage input to the input 13 of the microcomputer 12 is v2. In other words, when an alternating current is applied to the ignition heater 2, an alternating magnetic field is generated around the line, which causes the coil 8 to generate an alternating voltage, which is rectified and smoothed by the diode 9 and capacitor 10, and is expressed as vl. produces a DC voltage approximately proportional to the AC current IAC. When the conduction current IAC is higher than IS, the v
The transistor 11 is turned on by 1, and becomes 2"L" level. Of course, when the current ■Ac is less than Is, V□ is low, so the transistor 11 is off, and ■2 is ((
In other words, the microcomputer 12 can determine that the ignition heater 2 is energized when it becomes "L'" due to the human power 13, and conversely, even though the relay 3 is on, the input 13 When it becomes "H7+", it can be determined that the ignition heater 2 is disconnected. The output from the microcomputer 12 is controlled by 14 to drive the relay 3 for the ignition heater 2 via the transistor 15, by 16 to drive the relay 5 for the fuel pump 4 via the transistor 17, and by 18 to drive the relay 5 for the fuel pump 4 via the transistor 19. The ED20 (optical element) is lit to indicate an abnormality in the ignition heater disconnection. 21 is a current limiting resistor to the LED 20.

Next, the operation of an embodiment according to the present invention will be described. FIG. 3 shows a control flowchart of the microcomputer 12 after the start of operation. The microcomputer 12 starts the operation of the combustion machine by the user's operation of an operation switch (not shown), and immediately sets its output 14 to 11H" and turns on the relay 3. As a result, the ignition heater 2 becomes energized and enters the preheating mode. When the ignition heater 2 is normal, the alternating current IAc is Is
As a result, the input 13 of the microcomputer 12 detects L''.

The microcomputer 12 determines that the ignition heater 2 is normal due to the ttL" input from the human power 13, continues preheating, and then shifts to the ignition mode when the preheating is completed. In the ignition mode, the microcomputer 12 sets the output 16 to ttH". The relay 5 is turned on to drive the fuel pump 4, and the normal operation of the combustion engine can then be continued.

On the other hand, if the ignition heater 2 is disconnected when the preheating mode is entered (immediately after turning on the relay 3), the AC current IA
Since c does not occur, the input 13 of the microcomputer 1z is "JIH", and due to this "H" input of the human power 13, the microcomputer 12 determines that there is an abnormality in the ignition heater 2, and outputs the output 14 to forcefully stop the operation. By setting the output 18 to "L", the relay 3 is turned off and the ignition heater 2 is de-energized, and the output 18 is set to "H", which turns on the transistor 9.
D20 is turned on. Ignition heater 2 from the start of operation
If the wire is disconnected, after the user operates the operation switch,
The time it takes for E020 to turn on is very short, and the user can quickly determine whether the operation has been forced to stop, and can also identify the cause of this, which is a break in the ignition heater.

Effects of the Invention As described above, according to the present invention, the fuel supply device, the ignition heater that heats the combustion part during combustion ignition and during preheating after the start of operation until ignition, and the ignition heater that converts the current flowing to the ignition heater into voltage. In a control device that can detect the current flowing through the heater, if the heater current is not detected when the ignition heater starts energizing at the start of preheating, the operation is forcibly stopped, and an optical element is used to visually notify the user. By providing this, when one ignition heater is disconnected, the user can determine whether the operation is forced to stop immediately after issuing a driving instruction, and also can identify the cause of the disconnection of the ignition heater.

[Brief explanation of drawings]

FIG. 1 is a control circuit diagram according to the present invention, FIG. 2 is an electrical characteristic diagram of the heater current detection section, and FIG. 3 is a flowchart of a microcomputer as the control means. A... Heater current detection section, 2... Ignition heater, 4
...Fuel pump, 8...Coil, 120
0. Microcomputer, 20...LED.

Claims (2)

[Claims] (1) A burner, a fuel supply device that supplies fuel to the burner, an ignition heater that heats the combustion part during combustion ignition and during preheating after starting operation and before ignition, and converting current to the ignition heater into voltage. In a control device having a heater current detection section that detects current, if the heater current detection section (A) does not detect the energization current when starting energization of the ignition heater at the start of preheating, the operation is forcibly stopped, and the operation is forcibly stopped. An optical element (
20) A combustion control device comprising: (2) The heater current detection section (A) is connected to the ignition heater (2).
2. The combustion control device according to claim 1, wherein a change in the magnetic field generated by an alternating current supplied to the combustion chamber is converted into voltage by a coil, and the energization state is detected.