JPH0150809B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ignition device, and particularly to setting a temperature when igniting fuel.

[Conventional technology]

FIG. 4 is a diagram illustrating the main parts of an oil vaporization heating system including a conventional ignition device. In the figure, reference numeral 1 denotes a carburetor cylinder, into which kerosene 3 as fuel is injected through a nozzle 2. Reference numeral 4 denotes a preheater for heating the vaporizing tube 1, which heats and preheats the vaporizing tube 1 to a temperature suitable for igniting the kerosene 3. Reference numeral 5 denotes a temperature sensor provided in the vaporization cylinder 1 to detect the temperature of the vaporization cylinder 1. Reference numeral 6 denotes a control means that cuts off the power supply to the preheating heater 4 when the temperature detected by the temperature sensor 5 reaches a predetermined temperature.

The operation of the conventional example configured as described above will be explained with reference to the flowchart shown in FIG. First, turn on the power switch (not shown) (step 1).
0), the temperature of the vaporizing cylinder 1 is detected by the temperature sensor 5, and the control means 6 determines whether or not the detected temperature has reached a predetermined level of ignition temperature (step 11). If the detected temperature has not reached the predetermined ignition temperature, the control means 6 energizes the preheater 4 to perform heating (step 12). In step 11, when the temperature detected by the temperature sensor 5 reaches the ignition temperature, the vaporized oil 3a is ignited by an ignition means (not shown) (step 1).
3), combustion control (step 14) and combustion state monitoring (step 15) are repeated.

[Problem that the invention seeks to solve]

In the conventional device as described above, the ignition temperature at which the kerosene 3 is ignited is preferably a constant temperature. However, a temperature difference occurs between the vicinity of the injection port of the nozzle 2 and the temperature sensor 5, and the temperature detected by the temperature sensor 5 often does not match the temperature near the injection port of the nozzle 2. For example, when the vaporizing tube 1 itself is cold, such as when igniting and burning early in the morning in winter, the temperature near the injection port of the nozzle 2 and the temperature sensor 5
The temperature difference between the temperature at the mounting position of the nozzle 2, that is, the temperature gradient is large, and when the preheater starts energizing at this time, when the temperature detected by the temperature sensor 5 reaches the predetermined ignition temperature, the temperature near the nozzle 2 The temperature is quite high corresponding to the temperature gradient at the time of starting the energization, and becomes too high to be suitable for igniting the kerosene 3. In addition, when the device is extinguished and immediately re-ignited after being used for a long time, the vaporizing cylinder 1 is kept warm, and therefore the temperature near the injection port of the nozzle 2 and the temperature at the mounting position of the temperature sensor 5 are The temperature difference, that is, the temperature gradient, is small, and when the preheater 4 starts energizing at this time, the temperature detected by the temperature sensor 5 becomes
When the predetermined ignition temperature is reached, the temperature near the nozzle 2 is also approximately equal to this detected temperature.

In this way, conventionally, the difference between the sensor detected temperature at the time of ignition and the temperature near the nozzle 2 varies depending on the temperature of the vaporizer cylinder 1 at the time of starting energization, and for this reason, the sensor detected temperature is used as the temperature near the nozzle. The conventional method of trapping and igniting the fuel has not been able to achieve good ignition.

The present invention has been made to solve these problems, and it is an object of the present invention to provide an ignition device that can always preheat the inside of the vaporization cylinder to a temperature suitable for igniting fuel. be.

[Means for solving the invention]

The ignition device according to the present invention includes a determining means for determining a temperature value detected by a temperature sensor immediately before preheating, and an ignition temperature setting means for setting an ignition temperature based on this determination.

[Effect]

In the present invention, the ignition temperature is set based on the temperature detected by the temperature sensor immediately before preheating.

〔Example〕

FIG. 1 is a diagram illustrating the main parts of an oil vaporization heating system including an ignition device according to the present invention. In the figure, reference numeral 7 denotes a determining means for determining whether the temperature immediately before the start of preheating detected by the temperature sensor 5 is higher than a predetermined temperature. Reference numeral 8 denotes an ignition temperature setting means that sets the ignition temperature low when the determination means 7 determines that the temperature immediately before preheating is low, and sets the ignition temperature high when it is determined that the temperature immediately before preheating is high.
Based on the output of the ignition temperature setting means 8, the control means 6 cuts off the power supply to the preheater 4 and causes the ignition means to carry out ignition. Specifically, the determining means 7 determines whether the sensor detected temperature is 81°C or higher or 181°C or higher, and the ignition temperature setting means 8 sets the ignition temperature to 200°C when the sensor detected temperature is 80°C or lower. year,
When the sensor detected temperature is 81°C or higher and 180°C or lower, the ignition temperature is set to 220°C, and when the sensor detected temperature is 181°C or higher, the ignition temperature is set to 240°C.

FIG. 2 is an electrical circuit diagram of the embodiment of FIG. 1.
In the figure, a thermistor is used as the temperature sensor 5,
The power supply voltage is divided by a resistor 16 connected in series with this, and is input to a microcomputer 17. This microcomputer 17 is A/
D conversion circuit 17a, input circuit 17b, CPU 17
c, a memory 17d, and an output circuit 17e. Relays 18a and 18b are driven by the output of the microcomputer 17, and the relay 18a opens and closes the electrical circuit of the preheater 4, and the relay 18b opens and closes the electrical circuit between the motor 19 as an ignition means and the ignition transformer 20. Note that the microcomputer 17 includes the control means 6, the determination means 7,
The function of the ignition temperature setting means 8 is processed.

Next, the operation of this embodiment configured as described above will be explained with reference to the flowchart shown in FIG. First, turn on the power switch (step 21).
The temperature of the vaporizer cylinder 1 is detected by the temperature sensor 5, digitized by the A/D conversion circuit 17a, and then input to the CPU 17c via the input circuit 17b. The CPU 17c determines whether or not the input data is below 80°C based on the data previously stored in the memory 17d (step 2).
2). If the temperature is below 80°C, set the ignition temperature to 200°C (step 23). Next, the set ignition temperature
Determine whether the data from temperature sensor 5 has reached 200°C (step 24), and if it has not reached 200°C,
The CPU 17c outputs the relay 1 via the output circuit 17e.
8a to energize the preheater 4 (step 25). As a result, the vaporizing cylinder 1 is heated, and it is determined whether the data from the temperature sensor 5 has reached the ignition temperature of 200° C. (step 24).
When the temperature detected by the temperature sensor 5 reaches the ignition temperature of 200° C., electricity to the preheater 4 is cut off, and the relay 18b is activated by the CPU 17c. By activating the relay 18b, the heater 19 and the ignition transformer 20 as ignition means are energized, and an ignition operation is performed (step 26). Thereafter, combustion control (step 27) and combustion state monitoring (step 28) are performed. By the way, if the temperature detected by the temperature sensor 5 before preheating is 81°C or higher and 180°C or lower, the ignition temperature is set to 220°C.
(Steps 22, 29, 30), and if the temperature is 181°C or higher, the ignition temperature is set to 240°C (Steps 29, 31). Accordingly, it is determined whether or not preheating is complete (step 24), and based on this determination, either preheating is performed (step 25) or the process moves to ignition and combustion operations (steps 26, 27, and 28).

Although it has been explained that the temperature detected by the temperature sensor 5 immediately before preheating is divided into three stages to control the ignition temperature, it goes without saying that the temperature may be divided into any number of stages.

[Effects of the Invention] As explained above, the present invention provides a means for determining the temperature detected by the temperature sensor immediately before preheating, and a means for setting the ignition temperature based on the determination. This has the effect of always setting a uniform temperature suitable for

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of the main parts of an oil vaporization combustion type heating device as an embodiment of the ignition device according to the present invention, and FIG.
Figure 1 is an electrical circuit diagram of the embodiment, Figure 3 is its flowchart, Figure 4 is a configuration diagram of the main parts of an oil vaporization heating system as an example of a conventional ignition device, and Figure 5 is its flowchart. It is. DESCRIPTION OF SYMBOLS 1... Carburizer cylinder, 3... Fuel, 4... Preheating heater, 5... Temperature sensor, 6... Control means, 7...
Judgment means, 8... Ignition temperature setting means. Note that the same reference numerals are used for the same or corresponding parts in the figures.

Claims (1)

[Claims] 1. A vaporization cylinder into which fuel is injected, a preheater that heats this vaporization cylinder, a temperature sensor that detects the temperature of the vaporization cylinder, and when the temperature detected by this temperature sensor reaches a predetermined ignition temperature. an ignition device for igniting fuel at a time, a determining device for determining whether or not a temperature immediately before preheating by the preheating heater detected by the temperature sensor is higher than a predetermined value; An ignition device comprising ignition temperature setting means that sets the ignition temperature low when the previous temperature is determined to be low, and sets the ignition temperature high when the previous temperature is determined to be high.