JPH0378558A - Start assisting device for engine - Google Patents

Abstract

PURPOSE:To start a kerosene engine without using starting fuel such as gasoline by supplying kerosene to a vessel, having a wall part consisting of porous metal, atomizing the kerosene while heating the vessel, and thereafter guiding it to an intake manifold. CONSTITUTION:An atomizing vessel 4 is arranged in the interior of a guide pipe 3 with one end connected to an intake manifold 2 of an engine 1 further with the other end sealed. A pump 6 is connected through a pipe 5 to the atomizing vessel 4. The atomizing vessel 4 is formed by porous metal further with an insulation coated heater embedded in the peripheral wall. At the time of starting the engine 1, electrification to the heater is started while driving the pump 6. That is, kerosene in a fuel tank 10 is supplied to the atomizing vessel 4 and atomized thereafter introduced into a combustion chamber 1a of the engine 1 through the guide pipe 3 and the intake manifold 2. In this way, the kerosene engine is started without using starting fuel such as gasoline.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starting assist device applied to an engine that uses kerosene as fuel.

[Conventional technology]

Some outboard motors use kerosene engines that use kerosene as fuel.

As is well known, kerosene is less volatile than gasoline.

Therefore, in conventional kerosene engines, a highly vaporizable auxiliary fuel such as gasoline is used to start the engine, and the fuel is switched to kerosene when the engine is sufficiently warmed up.

[Problem to be solved by the invention]

However, when auxiliary fuel is used as a starting means, two types of fuel must be prepared, which is complicated.

In view of this situation, an object of the present invention is to provide a starting assist device that can start a kerosene engine without using auxiliary fuel.

[Means to solve the problem]

The starting aid device according to the present invention includes a container having a wall made of porous metal, a means for heating the container, a means for supplying kerosene to the container, and a container having a wall made of porous metal. and means for guiding the kerosene to the intake manifold.

[Effect]

In this starting aid device, the container is heated by the heating means. Accordingly, the viscosity of the fuel in the container is reduced, and the fuel is atomized through the wall of the container made of porous metal. This atomized fuel is then guided to the engine's intake manifold.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a starting assist device according to the present invention applied to an outboard motor engine 1 that uses kerosene as fuel.

This starting aid device has one end attached to the intake manifold 2.
A guide tube 3 connected to the guide tube 3 and sealed at the other end, an atomizing container 4 disposed inside the guide tube 3, and a pump 6 connected to the container 4 via a pipe 5. We are prepared.

FIG. 2 is an enlarged sectional view of the container 4. This container 4
is made of porous metal (for example, aluminum) having countless pores, and a heater 4b coated with insulation is embedded in its peripheral wall 4a. And the surrounding wall 4a
The pipe 5 opens into an internal space 4c defined by.

FIG. 3 illustrates a system for controlling the pump 6 and heater 4b. A temperature sensor 7 shown in the figure is attached to the cylinder head of the engine 1, detects the temperature of the cylinder head, and applies the detected signal to the comparison section 8.

Now, when a key switch (not shown) of the outboard motor is turned on, the comparison section 8 compares the temperature T detected by the temperature sensor 7 with a preset temperature Tr (for example, 80° C.). When the temperature of the cylinder head, which is the temperature detected by the temperature sensor, is lower than the preset temperature Tr, the comparing section 8
relay 9 is energized.

When the relay 9 is energized, its contacts 9a and 9b are closed, so that the pump 6 is driven and energization to the heater 4b is started.

By driving the pump 6, kerosene in the fuel tank 1o is introduced into the container 4 via the pipe 5, while the peripheral wall 4a of the container 4 is heated by energizing the heater 4b.

When this peripheral wall 4a is heated, the temperature of the kerosene in the container 4 increases and its viscosity decreases. As a result, the kerosene is atomized through the pores present in the peripheral wall 4a, as indicated by arrows in FIG. 2, and the atomized kerosene is discharged into the guide tube 3.

As is clear from the above explanation, the purpose of heating by the heater 4b is to atomize the kerosene, and therefore there is no need for the heater 4b to have the heat capacity to raise the kerosene to the boiling point temperature.

Next, when the outboard engine coil starter is pulled to start the engine, the atomized kerosene is introduced into the combustion chamber la of the engine 1 via the guide pipe 3 and the intake manifold 2.

The kerosene atomized by the container 4 has an extremely small particle size and therefore easily vaporizes within the combustion chamber 1a.

Therefore, according to this embodiment, the engine 1 can be started easily and reliably.

In addition, when operating the recoil starter, carburetor 1
Kerosene is also supplied from No. 1, but this kerosene is at a low temperature and in small quantities, and is not sufficiently atomized. Therefore, it is difficult to start the engine using only kerosene supplied from the carburetor 11.

When the engine is started and the temperature T detected by the temperature sensor 7 becomes equal to or higher than the preset temperature Tr, the relay 9 is deenergized by the comparator 8, and accordingly, the operation of the pump 6 and the power supply to the heater 4b are stopped. be done.

By the way, it takes some time for the container 4 to warm up after the heater 4b is energized. Therefore, by starting a timer that measures the time until the container 4 is sufficiently warmed up when the relay 9 is energized, and operating the recoil starter after the timer times out, more appropriate starting can be achieved. In this case, the time adve output of the timer activates a lamp, a buzzer, etc. to indicate the completion of starting preparations, and the operator performs the starting operation based on this.

Of course, a temperature sensor is provided to detect the temperature of the container 4,
The lamp or the like may be activated when the temperature detected by this sensor reaches a specified temperature.

In the embodiment, the heater 4b is embedded in the wall 4a of the container 4, but it is also possible to wrap the heater 4b around the circumferential surface of the container 4.

Further, in the embodiment, the entire container 4 is made of porous metal, but a portion of the container 4 may be made of porous metal.

〔Effect of the invention〕

According to the present invention, since kerosene can be used as a starting auxiliary fuel, a kerosene engine can be started without using a starting fuel such as gasoline.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing an embodiment of the starting assist device according to the present invention, FIG. 2 is a sectional view illustrating the structure of the atomization container,
FIG. 3 is a block diagram showing an example of means for controlling the pump and heater. 1...engine, 2...intake manifold,
3... Guide tube, 4... Container for atomization, 4a... Wall, 4b... Heater, 6... Pump, 7... Temperature sensor. Figure 2 Figure 3

Claims (1)

[Scope of Claims] A container having a wall made of porous metal, means for heating the container, means for supplying kerosene to the container, and an intake manifold for supplying the kerosene atomized through the wall. An engine starting assist device characterized by comprising: means for guiding the engine.