JPS61272466A - Internal-combustion engine - Google Patents

Abstract

PURPOSE:To permit the start and operation by using only one kind of petroleum fuel by installing heaters into a suction pipe and an engine combustion part and preheating the mixed gas and the engine combustion part. CONSTITUTION:The first heater 9 is installed onto the outer peripheral surface of a suction pipe 3, and the second heater 10 is installed in parallel to a spark plug 5 into an engine combustion part 11 which constitutes a combustion chamber 4 together with a piston 7. These heaters 9 and 10 are connected to a battery for the heater through switches 12, and used on start only. In the first heater 9, the suction pipe 3 is heated to preheat the passing mixed-gas and accelerates the atomization of fuel, and permits the ignition on start. Further, the second heater 10 preheats the engine combustion part 11 and heating- atomizes the mixed gas in a combustion chamber 8, thus facilitating the ignition performance furthermore, and also preheats the inside of the combustion chamber 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an internal combustion engine such as a spark-ignition oil engine that uses kerosene, light oil, or the like as fuel.

[Background technology]

In spark-ignition internal combustion engines, low-quality fuels such as kerosene and diesel oil have poor vaporization properties and require more ignition energy than gasoline, so it was necessary to use gasoline separately when starting the engine. Therefore, there is a problem that the engine becomes complicated and large, and there is a desire for an internal combustion engine that can be operated only on safe and inexpensive petroleum fuel.

[Purpose of the invention]

An object of the present invention is to provide an internal combustion engine that has improved startability and can be started and operated using only a single petroleum fuel.

[Disclosure of the invention]

In the internal combustion engine of the present invention, a first heater is attached to an intake pipe that supplies a mixture of intake air and fuel to a combustion chamber to preheat the mixture, and a first heater is provided in an engine combustion section constituting the combustion chamber. According to the present invention, the second heater is attached to preheat the combustion section of the engine.As described above, according to the present invention, the first heater is attached to the intake pipe that sends the air-fuel mixture to the air-fuel mixture. By preheating,
This promotes atomization of the fuel and enables ignition during startup.Furthermore, a second heater is attached to the engine combustion section (cylinder head, etc.) to preheat the engine combustion section, so the air-fuel mixture is heated within the combustion chamber. It is possible to further improve the ignitability at the time of starting by heating and atomizing, and it becomes possible to reliably and easily ignite and start using fuel with low vaporizability such as kerosene or light oil.

An embodiment of the present invention will be described based on FIGS. 1 and 2. FIG. 1 is a sectional view showing the internal combustion engine of this embodiment. In the figure, 1 is an air cleaner for taking in clean air, and a key and a preg 2 are connected to this. The air taken in by the carburetor 2t is mixed with fuel to create an air-fuel mixture. This mixture is transferred from the intake pipe 3 to the intake valve 8.
is sent to the combustion chamber 4 through the 14 is a fuel tank.

A spark plug 5 is installed in the combustion chamber 3, and the combustion chamber 4
The air-fuel mixture that enters the tank is ignited by a spark to cause it to explode and burn. As a result, the piston 7 in the cylinder 6 is actuated and the engine is operated.

At that time, a first heater 9 is attached to the outer circumferential surface of the intake pipe 3, and a second heater 10 is attached to the engine combustion part 11 (cylinder head) that constitutes the combustion chamber 4 together with the piston 7, along with the spark plug 5. Attached.

The first heater 9 heats the intake pipe 3 in advance to preheat the air-fuel mixture passing through the intake pipe 3 to fuel This promotes atomization of the fuel and enables ignition during startup. Further, the second heater 10 preheats the engine combustion section 11 to heat and atomize the air-fuel mixture in the combustion chamber 8 to make ignition more efficient, and also preheats the inside of the combustion chamber 8.

First and second heaters9. In this case, a ceramic heater (PTC heater), an electric heater, etc. that can instantaneously raise the temperature to the temperature required for vaporization can be used. These heaters9. IO is connected to a heater battery 13 via a switch 12, respectively.

Note that these heaters 9. IO is used only when starting, and during operation it switches the circuit and disconnects battery 1.
It is preferable to prevent the discharge of 3, and to charge the battery if the engine is equipped with a generator.

FIG. 2 is a graph showing the results of an experiment in which startability was investigated using the internal combustion engine of this embodiment. In this case, only kerosene was used as fuel. In addition, the temperature to be measured was the washer temperature of the spark plug, and the relationship between the washer temperature and the number of starter operations was determined. From FIG. 2, heater 9. When lO is not used (i.e., when the washer temperature is low), the number of starts is high;
It can be seen that while the startability of the engine is poor, when the heaters 9 and 10 are used for preheating, the startability of the engine is improved at a temperature of approximately 60° C. or higher.

〔Effect of the invention〕

According to this invention, by attaching the first no-heater to the intake pipe that sends the air-fuel mixture and preheating the air-fuel mixture, atomization of the fuel is promoted, ignition at the time of starting is possible, and the engine combustion section (cylinder A second heater is attached to the engine head (head, etc.) to preheat the combustion section of the engine, so the mixture is heated and atomized within the combustion chamber, further improving the ignitability at startup, making it possible to use kerosene, light oil, etc. This has the effect of making it possible to reliably and easily ignite and start using a fuel with low vaporizability.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of this invention, and FIG. 2 is a graph showing the relationship between spark plug washer temperature and number of starts. DESCRIPTION OF SYMBOLS 1... Air cleaner, 2... Carburizer, 3... Intake pipe, 4... Combustion chamber, 5... Spark plug, 9... First heater, lO... Second Heater; 11...Engine combustion section °P'history?

Claims (1)

[Claims] A first heater is attached to an intake pipe that supplies a mixture of intake air and fuel to a combustion chamber to preheat the mixture, and a second heater is attached to an engine combustion section that constitutes the combustion chamber. An internal combustion engine characterized by preheating a combustion section of the engine.