JPS58210353A - Starting device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent atomized fuel particles from condensing in a suction pipe even in cooling mode by atomizing methanol in the air-fuel mixture to be supplied to a suction pipe by means of ultrasonic wave at the time of starting in cooling mode for facilitating the atomized fuel particles to float in air stream. CONSTITUTION:Methanol in a methanol tank 15 is pushed into a carburetter float chamber 4 as main fuel by the operation of a fuel pump 17, and partly sent to a float chamber 8 of a methanol atomization tank 6 via a branch passage 16a. Meanwhile, by closing a key switch 11, a temperature sensor 19 detects the temperature of an internal-combustion engine to operate an ultrasonic wave oscillation circuit 10 via a control unit 20, and a diaphragm 9 is mechanically oscillated to atomize methanol. The negative pressure generated by the cranking of the internal-combustion engine sucks the atomized methanol into a suction pipe 3 via an atomized methanol passage 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starting device for an internal combustion engine. In particular, the present invention relates to a starting device for an internal combustion engine that uses methanol as fuel.

As a conventional starting device for an internal combustion engine, for example, the one shown in Fig. 1 ([
NAPs, L type carburetor specification maintenance manual 1197
There is something like the one shown in 1996 (published by Nissan Motor Co., Ltd.). In other words, when starting in a cold state, the nichrome wire ρ
Because the energization time is short and the temperature is low, the amount of displacement of the bimetal spring 5 is small.

The choke valve l remains closed. Therefore, the intake air flows into the air vent pipe 13', and the air vent pipe 13'
A large amount of fuel is pushed out from the main jet nozzle 21 due to the pressure difference between the valve 13' and the valve part '2.

However, in such a conventional internal combustion engine starting system, the choke valve is closed, so there is no air bleed effect, and a rich mixture containing a relatively large amount of fuel particles is created when the engine is cold. Because the air-fuel mixture was configured to be supplied to the suction pipe of the engine, the cooled rich mixture tends to condense on the walls of the suction pipe, and the mixture that is actually supplied becomes a lean mixture and condenses and liquefies. This fuel is supplied through the walls of the intake pipe, leading to deterioration of the air-fuel mixture distribution.Furthermore, if a fuel with a large latent heat of vaporization such as methanol fuel is used, it will have a very negative effect on condensation and distribution. There was a problem.

This invention was made by focusing on such conventional problems, and when starting in a cold state, fuel is supplied by a fuel atomization device that utilizes ultrasonic vibration, and fuel fine particles that easily float in the airflow are eliminated. The purpose of this invention is to solve the above problems by supplying a mixture containing a large amount of.

The present invention will be explained below based on the drawings. Figure 2 shows
FIG. 1 is a configuration diagram of an embodiment of the present invention. First, the configuration will be explained. In each figure, the same or equivalent parts are given the same reference numerals. The methanol atomization tank 6 consists of an atomization chamber 7 and a flow chamber 8, which communicate with each other. A diaphragm 9 made of an ultrasonic oscillation element is provided at the bottom of the atomization chamber 7, and the diaphragm 9 is mechanically vibrated by application of high frequency power from an ultrasonic oscillation circuit 10. An atmosphere inlet 13 is provided on the side of the atomization chamber 7, and a combustible mixture generated by mixing atomized methanol and the atmosphere is atomized into a methanol atomization tank 6 with one end opened at the top. The methanol is introduced into the intake pipe 3 of the internal combustion engine via the methanol passage 14. A fuel pump 17 is connected in the middle of the main methanol passage 16 from the methanol tank 15, and the downstream side of the fuel pump 17 is branched into two, one branch passage 16a is connected to the float chamber 8, and the other branch passage 16a is connected to the float chamber 8. is connected to the vaporizer float chamber 4 to pump methanol into both the vaporizer float chamber 4 and the float chamber 8.

Furthermore, reference numeral 19 indicates a temperature sensor for detecting the temperature of the internal combustion engine.
Control unit that turns on and off the power of O, 1
Reference numeral 8 indicates a flame arrester for preventing backfire, ku indicates a check valve for preventing air-fuel mixture backflow, 11 indicates a key switch, and 12 indicates a power source.

Next, the effect will be explained. Methanol in the methanol tank 15 is pumped as the main fuel to the float chamber 4 of the vaporizer by the operation of the fuel pump 17, and a part of it is also pumped to the float chamber 8 of the methanol atomization tank 6 through the branch passage 16a. .

On the other hand, by closing the key switch 11, the temperature sensor 19 detects the temperature of the internal combustion engine and sends a signal to activate the ultrasonic oscillation circuit 10 via the control unit 20. As a result, the ultrasonic oscillation circuit 10 is activated to mechanically vibrate the diaphragm 9 to atomize methanol, and at the same time, the negative pressure generated by cranking of the internal combustion engine by a starter (not shown) is applied to the atomized methanol. The generated atomized methanol is sucked into the suction pipe 3 through the passage 14 . When the internal combustion engine rises to a predetermined set temperature, the temperature sensor 19 detects this and sends a signal to the control unit 20 to stop the vibration of the diaphragm 9.

FIG. 3 shows a configuration diagram of another embodiment. First, to explain the configuration, this embodiment integrates the vaporizer float chamber 4, methanol atomization tank 6, and float chamber 6 of the embodiment shown in FIG. The float 5 has a diaphragm 9 made of an ultrasonic oscillation element attached to the center of the bottom of the tank, and the float 5 is formed into a hollow cylindrical shape so as not to come into contact with the diaphragm 9. The above float chamber 24
The air vent pipe 13' is the same as shown in FIG. The atomized methanol passage 14', which also serves as the air inlet 13 in the embodiment, communicates the side part of the float cylinder with the suction pipe 3.

Next, the effect will be explained. Methanol is supplied by pressure-feeding from the methanol tank 15 through the operation of the fuel pump 17, and the mechanism for generating atomized methanol is the same as that of the embodiment shown in FIG. 2 above. The atomized methanol is then sucked into the suction pipe 3 through the atomized methanol passage 14' due to negative pressure generated by cranking of the internal combustion engine.

As explained above, according to the present invention, in a starting device for an internal combustion engine, when starting in a cold state, methanol in the mixture supplied to the intake pipe is atomized using ultrasonic waves. As a result, atomized fuel particles with low surface tension and intermolecular attraction easily float in the air (and do not condense in the intake pipe when cold), improving the distribution of the air-fuel mixture. The effect is that fuel consumption can also be reduced.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram of a conventional example, Fig. 2 is a block diagram of an embodiment of the present invention, and Fig. 3 is a block diagram of another embodiment of the present invention. . Explanation of symbols l...Choke valve, 2...Venturi part, 3...
... Suction pipe, 4... Vaporizer float chamber, 5... Bimetal spring, 6... Methanol atomization tank, 7...
・Atomization chamber, 8.2... Float chamber, 9... Vibration plate,
1o...Ultrasonic oscillation circuit, 11...Key switch, 1
2... Power supply, 13... Atmospheric inlet, 13'... Air vent pipe, 14, 14'... Atomized methanol passage,
15... Methanol tank, 16... Main methanol passage, 16 a... Branch passage, 17... Fuel pump,
18...flame arrester, 19...temperature sender,
A: Control unit, 21: Main jet nozzle, 22: Nichrome wire, B: Check valve, 5
...Float agent patent attorney Junnosuke Nakamura

Claims (1)

[Claims] 1. A starting device for an internal combustion engine, comprising: a temperature sensor for detecting the temperature of the engine; and an ultrasonic vibration element driven by the output of the temperature sensor.