JPS60187753A - Fuel control apparatus - Google Patents

Abstract

PURPOSE:To enhance stability of idling operation of an engine and to thereby moderate uncomfortable feeling of the driver at the time of idling operation, by providing a fuel atomizing means for further atomizing fuel ejected from a fuel injection valve between a throttle valve disposed in an intake passage and one of a plurality of fuel injection valves disposed on the upstream side of the throttle valve. CONSTITUTION:A ring 17 of an ultrasonic vibration type atomizer 14 is located between a fuel injection valve 10a and a throttle valve 5, and fuel ejected from the fuel injection valve 10a is atomized further by the ring 17. Since the capacity of a single fuel injection valve is not sufficient for supplying a required amount of fuel at the time of high-load, high-speed operation of an internal-combustion engine 21, two or more fuel injection valves are provided. At the time of idling operation, however, fuel is supplied only from a single fuel injection valve 10a by the function of an idling-operation detecting switch. Thus, since fuel is atomized further at the time of idling operation when extreme atomization of fuel is required, air-fuel mixture of good quality can be supplied to the engine 21, so that stability of idling operation is enhanced and uncomfortable feeling of the driver at the time of idling operation is moderated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a fuel control device, and particularly to a fuel control device that includes two valves in an intake passage upstream of a throttle valve suitable for reducing rotational fluctuations during idling operation of an internal combustion engine. The present invention relates to a fuel control device having a fuel injection valve assembly.

[Background of the invention]

Regarding atomization of fuel, in the case of carburetors, the
As shown in No. 5-48193, ultrasonic vibration fine particles in a hollow cylindrical body are integrally fixed to a mechanical vibration amplifying section fixed to an ultrasonic converting section that converts electrical vibrations into mechanical vibrations downstream of the Ventery. (7) fuel? It is proposed that it be depleted.

Two fuel injection valves upstream of the throttle valve in the intake passage? Also in the installed fuel control device, it is important to further atomize the fuel injected from the fuel injection valve, and in this case,
It is conceivable to install one hollow cylindrical ultrasonic vibration atomizer downstream of the two fuel injection valves, but in this case, due to the structure of the ultrasonic vibration atomizer, two Fuel injected from the fuel injection valve? It is difficult to atomize the particles by collecting them on the wall surface, and the desired effect can be achieved. [Object of the Invention] The present invention has been made in view of the above, and its purpose is to The fuel injected from one of the fuel injection valves can be further atomized,
Rotation fluctuation during idling? The object of the present invention is to provide a fuel control device that can be made smaller and improve the stability of idling operation.

[Summary of the invention]

A feature of the present invention is that fuel is injected from the fuel injection valve between one of the plurality of fuel injection valves provided upstream of the throttle valve in the intake passage and the throttle valve. Fuel atomization means to atomize to z-J et al.? The point is that it has a set structure.

[Embodiments of the invention]

The present invention will be explained in detail below using the embodiment shown in FIG.

FIG. 1 is a structural explanatory diagram showing one embodiment of the fuel control device of the present invention. In FIG. 1, air supplied to an internal combustion engine 21 passes through an air cleaner lk, an intake passage 4 formed by a throttle valve body 2 and an intake manifold 3, and is throttled by a throttle valve 5 to a predetermined amount. It is weighed and then supplied.

An air bypass passage 6 is provided upstream of the throttle valve 5 in the intake passage 4.
The air entering from the air bypass passage 6a returns into the intake passage 4 from the air bypass passage outlet 6b. An air flow meter 7 is provided in the middle of the air bypass passage 6, and this air flow meter 7 measures the wall air flow rate flowing through the air bypass passage 6. It is possible to measure the air tk flowing through the four intake passages.

The air flow rate signal a from the air flow meter 7, the throttle valve opening signal b indicating the opening of the throttle valve 5, the cooling water temperature signal C indicating the temperature of the cooling water 8, and the oxygen concentration in the exhaust gas of the internal combustion engine 21 (not shown) The oxygen concentration signal d from the oxygen sensor to be detected is input to the electronic control device 9. The electronic control device 9 calculates the optimum fuel supply amount and sends it to the upstream of the throttle valve 5 in the intake passage 4. Two fuel injection valves 10a and lOb provided
It's like controlling the drive.

The fuel enters the fuel inlet vibrator 11 area, and the fuel passage in the throttle valve body 2 (c)? through the fuel injection valve 10a.

The pressure of this supplied fuel is maintained at a constant pressure by a fuel pressure regulator 12. In this case, excess fuel is passed through a fuel return pipe 13.
The fuel is discharged from the tank and returned to the fuel tank without white water.

By the way, in the embodiment shown in FIG. 1, a ring part 17 of the ultrasonic vibration atomizer 14 is provided between the fuel injection valve 10a and the throttle valve 5, and the ring part 17 controls the injection from the fuel injection valve Boa. Fuel to be used? This is to make the particles even more fine. The ultrasonic vibration atomizer 14 includes a piezoelectric element 15
, a horn 16, and a ring part 17, and a piezoelectric element 15
When a high-frequency voltage of ultrasonic waves is applied to the piezoelectric element 15, the piezoelectric element 15 is excited and vibrates ultrasonically.The vibration is amplified by the horn 16 and transmitted to the ring part 17. The contacting fuel or the fuel r in its vicinity becomes further atomized.

In the fuel control system, one fuel injection valve is insufficient due to its capacity to supply the required amount of fuel when the internal combustion engine 21 is under high load and at high speed, so two fuel injection valves in total are used. (or two or more) is provided, but when idle, idle? Switch to detect? This switch allows fuel to be supplied from only one fuel injection valve 10a. In particular, it is during idling that it is necessary to extremely atomize the fuel, and according to the embodiment of the present invention described above, the fuel injected from the fuel injection valve LOA during idling can be further atomized. This makes it possible to supply a high-quality air-fuel mixture to the internal combustion engine 21, which reduces fluctuations in the rotation of the internal combustion engine 21 during idling, improves the stability of idling operation, and reduces discomfort for the driver. be able to.

In addition, emissions are stabilized, air pollution can be prevented, and fuel economy can be improved.

In addition, in the above-described embodiment, the fuel I! X injection valve side valve 08
.

10b has been described, but even in the case of two or more, it is necessary to install it in the ring part 17 of the ultrasonic vibration atomizer 14 downstream of one fuel injector used during idling. You can get the same effect as Eri.

Claims (1)

[Claims] 1. At least two fuel injection valves provided in the intake passage upstream of a throttle valve provided in the intake passage that supplies air to the internal combustion engine, and the entire operation of each fuel injection valve is controlled. In a fuel control device comprising an electronic control device, a fuel that further atomizes the fuel injected from the fuel injection valve between one of the plurality of fuel injection valves and the throttle valve. Should atomization means be provided? Features a fuel control device. 2. The fuel control device according to claim 1, wherein the fuel atomization means is a hollow cylindrical body integrally fixed to the tip of a horn that amplifies ultrasonic vibrations (II-) of an ultrasonic vibration atomizer.