JPS61201874A - Fuel feeder - Google Patents

Abstract

PURPOSE:To supply the superior mixed gas by allowing the atomized fuel to flow with intake air by installing a ring vibration part of a supersonic-wave atomizer at the position where the flow rate of the intake air of a throttle valve is high and stream is stabilized. CONSTITUTION:The suction passage 9 of an atomizer body 2 is formed in eccentricity for the suction passage 8 of a throttle body 1, and a ring vibration part 6 for supersonic wave is installed on the periphery of the edge part of the passage 8 so that the axis line is in parallel to the axis line 13 of the suction passage 9. When a throttle valve 3 is opened, the main flow of inhaled air is generated insidethe ring vibration part 6 of the atomizer, and the air is jetted inside from a penetration hole 10, and the fuel atomized by the supersonic-wave vibration of the inside wall forms the superior mixed gas together with the inhaled air. Thus, low is permitted, and the effect of the supersonic-wave atomizer can be utilized to the utmost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a fuel supply system for a multi-cylinder internal combustion engine, and particularly to a fuel injection type fuel supply system suitable for fuel atomization.

[Background of the invention]

For example, Japanese Patent Laid-Open No. 58-2 discloses a method of promoting atomization of ejected fuel by installing a ring vibrating section supported by an ultrasonic vibrator.
As shown in Japanese Patent No. 10354, a ring vibrating section is provided in the suction A cylinder upstream of the throttle valve to supply atomized fuel. This method supplies fuel with an average particle size of 40μ and has good atomization, but the fuel adhesion on the throttle valve and the wall surface of the main body cannot be removed.For this reason, ultrasonic waves are applied downstream of the throttle valve. A structure in which an atomization device is provided is considered. However, as shown in diagram M1, the air flow downstream of the throttle valve is stable at L/D Ki 2 or higher. L/D
If an ultrasonic ring vibrating section is provided within the middle 2, atomized fuel will accumulate at the bottom of the throttle valve, causing an increase in the wall WJR and deterioration of response. If installed at two or more positions in the L/D, there will be no problem in terms of performance, but the height of the fuel supply device body will pose a problem when mounted singly, and the quality will be reduced.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel supply system that allows fuel atomized downstream of a throttle valve to flow into the intake air flow, reduces wall adhesion flow, and supplies good mixed air.

[Summary of the invention]

In order to achieve the above object, the present invention provides a configuration in which the ring vibrating section of the ultrasonic atomization device is provided at a position where the intake air flow rate of the throttle valve is high and the flow is stable.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. The main body is composed of a throttle body l and an atomizer body 2. A throttle valve 3 fixed to a throttle shaft 4 provided eccentrically from a passage axis 11 is provided in the intake passage 8 of the throttle body l. The intake passage 9Fi of the atomizer body 2 and the intake passage 8 of the throttle body are provided eccentrically, and an ultrasonic vibrator 14 is attached and fixed to this part from the outer part, and a ring vibrating part 6 is installed at the other end. is fixed. The ring vibrating portion 6 has an axis parallel to the axis 13 of the intake passage 9 and is provided near the end of the intake passage 8 . The ring vibrating section 6 is provided with a through hole 10, and an injection valve 7 is provided at a position where fuel is injected into the ring vibrating section 6 through the through hole 10. The injection valve 7 has fuel,
The fuel is supplied via a fuel supply passage by a fuel pump (not shown).

The fuel injected from the injection valve 7 is actuated by a signal from an intake air amount detector (not shown) that detects the amount of air taken in according to the opening degree of the throttle valve 3, and the fuel is injected according to the amount of intake air. Supplied.

The ring vibrating part 6ri applies pressure having a resonant frequency to the ultrasonic vibrator 14 by a drive circuit (not shown), thereby transmitting ultrasonic vibrations with an amplitude expanded in the direction perpendicular to the cylindrical axis to both the inner and outer wall surfaces. Occurs over a wide area. The fuel injected from the injection valve 7 and supplied into the ring vibrating part 6 through the through hole 10 is instantaneously atomized when it adheres to the wall surface.1. Ru.

With the above configuration, when the throttle valve 3 is opened, the main flow of the intake air flows inside the ring vibrating section 6 of the ultrasonic atomizer, so that it is injected into the ring vibrating section 6 and atomized by the ultrasonic vibration of the inner wall. The fuel with an average particle size of 40 μm rides on the intake air and forms a good air-fuel mixture. i, /1) middle school 1
．． FIG. 4 shows a comparison of wall surface adhesion rates between the present invention and the structure shown in FIG. 3 in state No. 4. It is clear that the effect of the present invention is significant in the low opening range.

〔Effect of the invention〕

According to the present invention, it is possible to reduce the height, and furthermore, it is possible to make maximum use of the effects of the ultrasonic atomization device.

[Brief explanation of the drawing]

Fig. 1 is a flow chart of intake air of throttle pulp flow;
FIG. 2 shows a vertical cross-sectional area of the present invention, FIG. 3 is a vertical cross-sectional view of a general configuration, and FIG. 4 shows comparative data of wall adhesion rates between the present invention and FIG. 3. ■...Throttle body, 2...Atomizer body, 7...Injection valve, 6...Ring vibration part, 14...
Ultrasonic transducer.

Claims (1)

[Claims] 1. In a fuel supply system for an internal combustion engine, a ring vibrating section supported by an ultrasonic vibrator is provided in the intake passage downstream of the throttle valve, and an injection valve for injecting fuel to the inner wall of the ring is provided. A fuel supply device characterized in that the shaft center is eccentric from the shaft center of the intake passage of the throttle valve mounting part.