JPH0436059A - Fuel supply method for internal combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a spark ignition engine that uses a fuel with low startability such as diesel oil, kerosene, or alcohol, and particularly relates to a spark ignition engine that uses an ultrasonic atomizer. Conventionally, in order to improve the startability of internal combustion engines, spark ignition engines such as gasoline engines are equipped with a choke valve or a starting increase mechanism in systems that use a carburetor fuel supply system. Furthermore, in systems using fuel injection valves, the amount of fuel supplied at 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 an increase in emissidine, and in particular, it is difficult to start at low temperatures even with the above conventional method when using low-volatile fuels other than gasoline.
In the case of 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, the above-mentioned problem has not been completely solved, for example, with alcohol fuels, particularly methanol, kerosene, and other fuels with poor startability.

An object of the present invention is to solve the above-mentioned problems, and to enable low-temperature starting of a spark ignition engine that uses fuel with low startability such as diesel oil, kerosene, or alcohol, and to shorten the starting time. This is to enable shortening and reduction of HC emissilon.

Another object of the present invention is to improve the efficiency of energy consumption by efficiently heating fuel only when necessary.

[Means for Solving the Problems] For this purpose, the fuel supply method for an internal combustion engine of the present invention uses light oil,
In a spark ignition engine 1 that uses fuel with low startability such as kerosene or alcohol, an ultrasonic vibration member 10 disposed in an intake pipe 4 and an atomization section 1 of the ultrasonic vibration member are used.
2, and a heater 30 for heating the fuel disposed between the fuel supply valve 9 and the ultrasonic vibration member 10.
When the switch 32 is turned on, the fuel is preheated with a low calorific value by the heater 30, and when the starter motor M rotates, the fuel is heated with a high calorific value.

Note that the numbers added to the above configurations are for comparison with the drawings to facilitate understanding, and the configurations of the present invention are not limited thereby.

[Function] In the present invention, as shown in FIG. 1, for example, when the outside temperature is low, the cooling water temperature sensor T is turned on, and when the ignition switch 32 is switched from the OFF contact to the IG contact in this state, the heater 30 is connected to battery 3 via resistor R.
1 and preheats the fuel with low calorific value. Next, when the ignition switch 32 is rotated and connected to the IG contact and also to the ST contact, the starter motor M rotates and the heater 30
is connected in series to the battery 31 and a large current flows, so
The fuel supplied from the fuel supply valve 9 is heated with a high calorific value by the heater 30, and is heated by the atomization section 12 of the ultrasonic vibration member 10.
In this step, the fuel is atomized into fine droplets, promoting vaporization of the fuel and improving ignitability.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an electric circuit diagram showing one embodiment of the fuel supply method for an internal combustion engine according to the present invention, FIG. 2 is a configuration diagram showing one embodiment of the internal combustion engine according to the present invention, and FIG. It is a sectional view of an ultrasonic atomization device.

In the present invention, a fuel with low startability such as light oil, kerosene, or alcohol fuel is used as the fuel.

In FIG. 2, the spark ignition engine 1 has cylinders 2,
Piston 3, intake pipe 4, exhaust pipe 5, intake valve 6, exhaust valve 7
An ultrasonic atomizer 11 consisting of a fuel supply valve 9 and an ultrasonic vibration member 10 is attached to the intake pipe 4 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. 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 provided in the upper combustion chamber 15 of the cylinder 2, facing the piston 3.
is installed.

As shown in FIG. 3, the ultrasonic atomization device 11 has a support member 24 in which a vibrating member fitting hole 21, a fuel supply valve fitting hole 22, and a fuel supply path 23 are formed.

An outer cylinder 25 is fitted into the vibration member fitting hole 21, and an inner cylinder 26 is further screwed onto the inner periphery of the outer cylinder 25.
6, an annular fuel passage 27 is formed therebetween. The ultrasonic vibration member 10 described in FIG. 2 is fixed to the inner circumference of the outer cylinder 25 by a fixing member 29 via an O-ring 28.

The fuel supply valve fitting hole 22 communicates with the annular fuel passage 27 via the fuel supply passage 23, and supplies fuel from the tip of the annular fuel passage 27 to the atomizing section 12 of the ultrasonic vibration member 10. There is. A heater 30 for heating fuel is arranged within the fuel supply path 23 .

FIG. 1 is an electrical circuit diagram showing one embodiment of the method for supplying fuel to an internal combustion engine according to the present invention.

In the figure, reference numerals 9, 10, 11, and 30 are the aforementioned fuel supply valve, ultrasonic vibration member, ultrasonic atomization device, and heater, respectively. 31 is a battery, 32 is an ignition switch, M is a starter motor, R11R2 is a control relay, rl is a normally open contact of control relay R1, r 211r 22 is a normally open contact of control relay R2, MRI.

MR2 is a power relay mrl, mr2 is its normally open contact, 33 is an ignition circuit, S is an engine start completion sensor, T is a cooling water temperature sensor, R is a resistor, and 34 is an ultrasonic oscillator.

The operation of the present invention having the above configuration will be explained.

When the outside temperature is low, the cooling water temperature sensor T is turned on, and the engine start completion sensor S is also turned on.

When the ignition switch 32 is switched from the OFF contact to the IG contact in this state, the ignition circuit 33 becomes operational, and the ultrasonic oscillator 34 operates to vibrate the ultrasonic vibration member 10. At the same time, control relay R2 is energized and its normally open contact r21 is closed, power relay MHI is energized and its normally open contact mrl is closed. Therefore, the heater 30 is connected to the battery 31 via the resistor R, and preheats the fuel in the fuel supply path 23 (FIG. 3) with a low calorific value.

Next, when the ignition switch 32 is turned and connected to the IG contact and the ST contact, the starter motor M rotates.
The ignition circuit 33 is activated by the engine crank angle signal, and a fuel injection signal is output to the fuel supply valve 9 to supply fuel to the ultrasonic vibration member 10. At the same time, normally open contact r
Since 22 is closed, control relay R1 is energized, its normally open contact rl is closed and power relay MR2 is energized, and its normally open contact mr2 is closed. Therefore, since the heater 30 is connected in series to the battery 31 and a large current flows through it, the fuel supplied from the fuel supply valve 9 is heated by the heater 30 with a high calorific value, and the fuel is heated in the atomization section 12 of the ultrasonic vibrating member 10. Atomizes fuel into fine droplets to promote fuel vaporization and improve ignitability.

When the ignition switch 32 is returned to the IG contact, the control relay R1 is de-energized and the normally open contact rl is opened, and the power relay MR2 is de-energized and the normally open contact mr2 is opened. At this time, if the engine is not started, the engine start completion sensor S remains on and the normally open contact mrt is closed, so the heater 30 is connected to the battery 31 through the resistor R.
is connected to preheat the fuel with low calorific value. Then, turn the ignition switch 32 again and add the IG contact to the S
It also connects to the T contact to rotate the cell motor M.

When the engine startup is completed, the engine startup completion sensor S is turned off, so that the control relay R2 and the power relay MRI are de-energized, and heating of the fuel by the heater 30 is stopped. In addition, when the outside temperature is high, the cooling water temperature sensor T
is off, control relay R2 and power relay MHI are not energized, and heater 30 does not heat the fuel.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made.

For example, in the above embodiment, fuel is constantly supplied to the ultrasonic atomizer 11 by the fuel supply valve θ, but the ultrasonic atomizer is used only at startup, and the carburetor or the Fuel may be supplied by a dedicated fuel supply valve.

[Effects of the Invention] As described above, according to the present invention, when starting the engine, when the ignition switch is turned on, the fuel is preheated with a low calorific value, and when the starter motor rotates, the fuel is heated with a high calorific value. Alternatively, it is possible to start a spark ignition engine using a fuel with low startability such as alcohol at a low temperature, and also to shorten the starting time and reduce HC emissions.

Furthermore, since fuel is efficiently heated only when necessary, energy consumption can be made more efficient.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing one embodiment of the fuel supply method for an internal combustion engine according to the present invention, and FIG.
FIG. 3 is a sectional view of the ultrasonic atomization device in FIG. 2, which is a block diagram showing an embodiment. DESCRIPTION OF SYMBOLS 1... Engine, 4... Intake pipe, 9... Fuel supply valve, 10... Ultrasonic vibration member, 12... Atomization part, 30... Heater, 32... Ignition switch , M... Cell motor. Applicant Tonen Corporation

Claims (1)

[Claims] (1) In a spark ignition engine that uses low-volatile fuel such as kerosene or alcohol fuel, an ultrasonic vibrating member disposed in the intake pipe and fuel that supplies fuel to the atomizing part of the ultrasonic vibrating member. It includes a supply valve and a heater for heating the fuel disposed between the fuel supply valve and the ultrasonic vibration member, and when the ignition switch is turned on when starting the engine, the heater preheats the fuel with a low calorific value. A fuel supply method for an internal combustion engine, characterized in that when the starter motor rotates, the fuel is heated with a high calorific value.