JPH0412158A - Fuel supply device of spark ignition engine - Google Patents

Abstract

PURPOSE:To enable low temperature start by providing an ultrasonic vibration member in an intake pipe of a spark ignition engine using a fuel which is hard to start such as alcohol fuel and so on, and by increasing an electric power of an ultrasonic vibration generating means in starting the engine. CONSTITUTION:An ultrasonic atomizing device 11 comprising a fuel supply valve 9 and an ultrasonic vibration member 10 is attached on the side of an intake pipe 4 of a spark ignition engine 1. An atomization part 12 is formed on one end of this ultrasonic vibration member 10, an electric/acoustic conversion element 13 is provided on the other end, and this element 13 is connected to an oscillation circuit so as to constitute an ultrasonic vibration generating means. And a fuel supplied by the fuel supply valve 9 reaches the atomization part 12 and is atomized by an ultrasonic vibration by the electric/acoustic conversion element 13. At this time, in starting an engine, an electric power at the electric/acoustic conversion element 13 is increased. By this, the ultrasonic vibration member 10 itself is made to generate heat so as to heat the fuel, and low temperature start of the engine using a fuel which is hard to start is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to a spark generator that uses a low-volatile fuel such as kerosene, a low cetane number fuel such as cracked light oil, and/or a fuel that is difficult to start such as alcohol fuel. The present invention relates to an ignition type engine, and particularly to a fuel supply device applied to a system using an ultrasonic atomizer.

[Prior Art] Conventionally, in order to improve the startability of internal combustion engines, spark ignition engines such as gasoline engines have been equipped with an e-check valve or a starting fuel increase mechanism in systems that use a carburetor fuel supply system. Furthermore, in systems using fuel injection valves, the amount of fuel supplied at the time of startup is increased by electronically controlling the injection valves.

[Problems to be solved by the invention] Although these measures ensure startability at room temperature, it takes time to start at low outside temperatures, and HC
There are problems such as increased emissions, and the above conventional Depending on the method, starting at low temperatures is difficult; for example, in the case of alcohol, kerosene, etc., a method is adopted in which gasoline is used at the time of starting to improve starting performance.

As a solution to this problem, attempts have been made to employ an ultrasonic atomizer to atomize the supplied fuel, promote evaporation of the fuel, and improve ignition. Although this generally improves startability, it has not yet completely solved the above problem.

An object of the present invention is to solve the above-mentioned problem, and to use low-volatile fuel such as kerosene, low cetane number fuel such as cracked light oil, and/or hard-to-start fuel such as alcohol fuel in a spark-ignition engine. The purpose of this invention is to enable low-temperature starting of engines that use fuel, shorten starting time, and reduce HC emissions.

[Means for Solving the Problems] To this end, the fuel supply device for the spark ignition engine of the present invention uses low-volatile fuel such as kerosene, low cetane number fuel such as cracked light oil, and/or hard-to-start fuel such as alcohol fuel. In a spark ignition engine that uses fuel, an ultrasonic vibration member 10 disposed within the intake pipe 4;
It has a fuel supply valve 9 that supplies fuel to the atomization section 12 of
By increasing the electric power of the ultrasonic vibration generating means when starting the engine, the ultrasonic vibration member 10 itself generates heat and heats the fuel. Note that the numbers added to the above configurations are for ease of understanding. This is for comparison with the drawings, and the configuration of the present invention is not limited thereby.

[Operations] In the present invention, only low-volatile fuels such as kerosene, low cetane fuels such as cracked diesel oil, and/or fuels that are difficult to start such as alcohol fuels are used. The power in the conversion element 13 is increased. As a result, as shown in FIG. 2, for example, the vibrator main body 22 itself generates heat to heat the fuel, which promotes vaporization of the fuel and enables starting.

[Example code] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of a spark ignition engine according to the present invention.

The spark ignition engine 1 has a cylinder 2, a piston 3, an intake pipe 4, an exhaust pipe 5, an intake valve 6, and an exhaust valve 7.
An ultrasonic atomizer 11 consisting of a fuel supply valve 9 and an ultrasonic vibrating member 10 is attached to the side. An atomizing section 12 is formed at one end of the ultrasonic vibration member 10, and an electric/acoustic conversion element 13 is provided at the other end. The element 13 is connected to an oscillation circuit (not shown) and constitutes ultrasonic vibration generating means. Note that the shape of the atomizing portion 12 may be a well-known shape such as a round shape or a bat shape. Further, an ignition device 16 is disposed in the combustion chamber 15 in the upper part of the cylinder 2 so as to face the piston 3 .

FIG. 2 is a sectional view showing one embodiment of the fuel supply device of the present invention.

The ultrasonic vibration member 10 includes a cylinder 21 and a vibrator body 22.
, an electric/acoustic conversion element 13, a vibrator body 22 is press-fitted into the cylinder 21 via a ring 23, and a fuel storage portion 24 is formed between the lower part of the vibrator body 22 and the cylinder 21. are doing. A fuel supply pipe 25 is connected to the fuel storage portion 24 through the cylinder 21 . A spherical atomizing section 12 is integrally formed at the tip of the vibrator body 22, and a nozzle section 26 is formed at the tip of the cylinder 21. are arranged with a slight gap.

Then, the fuel supplied from the fuel supply pipe 25 passes through the fuel storage section 24 and reaches the atomization section 12 from the nozzle section 26, where the fuel is atomized by ultrasonic vibration by the electric-O-acoustic transducer element 13. Ru.

In the present invention, only low-volatile fuel such as kerosene, low cetane fuel such as cracked light oil, and/or fuel that is difficult to start such as alcohol fuel is used. increase the power in As a result, the fuel present in the fuel storage section 24 acts as a load for the ultrasonic vibration of the vibrator body 22, which generates heat in the vibrator body 22 itself, which heats the fuel and promotes fuel vaporization, allowing starting. becomes.

3 is a sectional view showing another embodiment of the fuel supply device of the present invention, FIG. 4 is a sectional view taken from the direction of the arrow IV-IV in FIG. 3, and FIG. 5 is a main part in FIG. 3. It is an enlarged sectional view.

The ultrasonic vibration member 10 includes a cylinder 21 and a cylinder 21.
a vibrator body 22 fixed and supported within the vibrator body 2;
Electrical/acoustic transducer element 13 that imparts ultrasonic vibration to 2.
and a sleeve member 28 that is screwed onto the outer periphery of the cylinder 21 through a threaded portion 27. An annular fuel supply passage 29 is formed between the cylinder 21 and the sleeve member 28, and fuel is supplied to the fuel supply passage 29 from the fuel supply pipe 25.

An atomizing section 12 is formed at the tip of the vibrator body 22 , and an annular nozzle section 26 is formed between the cylinder 21 and the sleeve member 28 , and fuel is supplied to the atomizing section 12 from the nozzle section 26 . It is supplied and atomized into fine droplets by ultrasonic vibration. As shown in FIG. 5, the vibrator main body 22 is fixed and supported at both ends of the cylinder 21 by oil-resistant rubber members 30 and 31.

In this embodiment, when the engine is started, when the electric power in the electro-acoustic transducer 13 is increased, the tip of the vibrator body 22 is fixed by the rubber member 31, so the vibrator body 22 absorbs ultrasonic vibrations. At this time, the vibrator main body 22 itself becomes a load and generates heat, which heats the fuel, promotes vaporization of the fuel, and enables starting.

[Effects of the Invention] As described above, according to the present invention, by increasing the electric power of the ultrasonic vibration generating means when starting the engine, the ultrasonic vibration member itself generates heat and heats the fuel. , it enables low-temperature starting of engines using low-volatile fuels such as kerosene, low cetane number fuels such as cracked diesel oil, and/or hard-to-start fuels such as alcohol fuels, shortens starting time, and reduces HC emissions. This makes it possible to reduce

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing one embodiment of a spark ignition engine according to the present invention, FIG. 2 is a sectional view showing one embodiment of a fuel supply device of the present invention, and FIG. A sectional view showing another embodiment, FIG. 4 is taken along the line IV-IV in FIG. 3.
5 is an enlarged sectional view of the main part in FIG. 3; FIG. 1... Spark ignition engine, 4... Intake pipe, 9...
Fuel supply valve, 10... Ultrasonic vibration member, 12... Atomization section, 13... Ultrasonic vibration generation means. Sparse diagram 5 Figure 4

Claims (3)

[Claims] (1) An ultrasonic vibration member installed in the intake pipe in a spark ignition engine that uses low-volatile fuel such as kerosene, low cetane number fuel such as cracked light oil, and/or hard-to-start fuel such as alcohol fuel. and a fuel supply valve that supplies fuel to the atomization section of the ultrasonic vibrating member, and by increasing the electric power of the ultrasonic vibration generating means when starting the engine, the ultrasonic vibrating member itself generates heat and the fuel is generated. A fuel supply device for a spark ignition engine, characterized by heating. (2) The ultrasonic vibration member has a cylinder and a vibrator body fixed within the cylinder, and a fuel storage portion is formed between the cylinder and the vibrator body. 2. The fuel supply device for a spark ignition engine according to 1. (3) The ultrasonic vibration member includes a cylinder and a vibrator body fixed within the cylinder, and the cylinder and the tip of the vibrator body are fixed by a rubber member. A fuel supply system for the spark ignition engine as described.