JPS5896155A - Fuel feeding apparatus for engine - Google Patents

Abstract

PURPOSE:To permit alcohol and gasoline to be separately supplied into an engine through separate passages by feeding a proper amount of water corresponding to the flow amount of the mixed fuel consisting of alcohol and gasoline and separating said mixed fuel into two layers of alcohol and gasoline in one fuel storage tank. CONSTITUTION:The flow-rate of the mixed fuel poured from a fuel pouring port 3 is measured by a flow-rate measuring means 11, and a proper amount of water corresponding to said flow-rate and the temperature of the mixed fuel which is detected by a temperature sensor 13 is supplied into a fuel tank 2, being controlled by a control valve 12. Mixed fuel is separated into alcohol and gasoline. Gasoline is supplied into the carburetor 18 of the engine 1 through an intake pipe 17 and a gasoline feeding passage 7. The alcohol containing water is reformed to reformed gas and water vapour in a reformer 9, and further cooled to form reformed gas and water in a cooler 10, and both substances are supplied into the intake passage of the engine 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel supply system for an engine.

In recent years, mixed fuels of alcohol and gasoline, which have been put into practical use as engine fuels, undergo phase separation due to the mixing of small amounts of water. It is generally known that there are two major problems, as described in, for example, Automotive Engineering Complete Book 7, Automotive Fuel and Lubricant (published by Sankaido).
There is.

Conventionally, alcohol and gasoline were stored in separate tanks and supplied to the engine through separate routes, but this required two systems of fuel supply systems, and in addition, alcohol and gasoline were stored in separate tanks and supplied to the engine through separate routes. Since the fuel mixture is stored in a separate tank, it is not possible to use the mixed fuel as it is, and if this mixed fuel comes to be sold normally at gas stations, etc., the mixed fuel must be separated once. I have a problem with having to do this.

In view of the above, the present invention provides a fuel storage tank into which the mixed fuel is directly injected and stored, and supplies an appropriate amount of water to the fuel storage tank according to the flow rate of the mixed fuel. An engine fuel in which alcohol and gasoline are separated by using water, which had been avoided due to its negative effect on the compatibility of alcohol, and the alcohol and gasoline are supplied to the engine through separate fuel supply channels. A supply device is provided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below based on embodiments with reference to the drawings.

<Example/> This example is shown in FIG. 1 is the engine, 2 is the fuel inlet 3
A fuel storage tank into which a mixed fuel of alcohol and gasoline is injected through an injection passage 4, 5 a water tank that supplies water to the fuel storage tank 2 through an injection passage 6, and 7 a water tank from which water is supplied from the fuel storage tank 2. A gasoline supply passage 8 supplies gasoline to the engine 1 , and is an alcohol supply passage 8 that supplies alcohol from the fuel storage tank 2 to the engine 1 via a reformer 9 and a cooler 10 .

Injection passage 4 for injecting the mixed fuel into the fuel storage tank 2
, a flow rate measuring means 11 for measuring the flow rate of the mixed fuel is installed, and a control valve 12 for controlling the water valve is installed in the injection channel 6 for supplying water to the fuel storage tank 2, and further, A temperature sensor 13 is attached to the fuel storage tank 2 to detect the temperature of the mixed fuel to be injected.

The flow rate measuring means 11, control valve 12 and temperature sensor 13 are linked to the control means 14, and are used to separate alcohol and gasoline in the injected mixed fuel based on the flow rate and temperature of the mixed fuel. The control means 14 electrically calculates the amount of water required to control the control valve 12;
An appropriate amount of water is supplied to the fuel storage tank 2.

The reason why temperature was used as one of the factors to control the amount of water was that the phase separation between alcohol and gasoline is affected by temperature, such that the lower the temperature, the smaller the amount of water required. .

In addition, a float 15 is rotatably supported in the fuel storage tank 2 via a support rod 16, and a suction pipe 17 is attached to the float 15. The fuel is supplied to the carburetor 18 of the engine 1 through the passage 7.

On the other hand, in the alcohol supply passage 8, the rifoma 9 is supplied with water-containing alcohol sent from the fuel storage tank 2,
- A fuel passage filled with a reforming catalyst is provided inside the fuel passage, and an exhaust passage 19 is passed from the engine 1 to the outside of the fuel passage. It supplies the exhaust gas to be sent and uses the heat of the exhaust gas to promote the activity of the reforming catalyst. As the reforming catalyst, Pt, Pd, Rh, Ru, I
Noble metals such as r, Os or Ni, Go,
Any one of base metals such as Fe, Cr, Zn, etc. or a combination thereof may be used.

The cooler 10 cools a mixed gas of reformed gas and water vapor sent from the reformer 9 into reformed gas and water.
0.

Next, to explain the operation, the flow rate of the mixed fuel injected from the fuel injection port 3 is measured by the flow rate measuring means 11, and an appropriate amount is determined according to the flow rate and the temperature of the mixed fuel detected by the temperature sensor 13. Water is controlled by a control valve 12 and supplied to the fuel storage tank 2, and the mixture is separated into fuel coal and gasoline. Then, gasoline is supplied to the carburetor 18 of the engine 1 via the intake pipe 17 and the gasoline supply passage 7. Further, the alcohol containing water is reformed in the reformer 9 to become reformed gas and water vapor, and is further cooled in the cooler 10 to become reformed gas and water, which is then passed through the intake passage 20 of the engine 1.
is supplied to

Note that, when the mixing ratio of alcohol and gasoline in the mixed fuel is constant, the flow rate measuring means 11 can know the amount of alcohol by simply measuring the flow rate of the mixed fuel. If the alcohol flow rate differs depending on the type of alcohol, an alcohol sensor may be attached to the flow rate measuring means 11 to measure the alcohol flow rate.

In the alcohol supply passage 8, for example, a control valve may be provided between the cooler 10 and the intake passage 20, or the alcohol supply passage 8 may be connected to the intake passage 20 upstream of the vaporizer.
When the engine 1 is started, the supply of reformed gas is suppressed and only gasoline is supplied to prevent deterioration in startability, and the reformed gas may be supplied only during normal operation. . Furthermore, since reformed gas has a high calorific value, supplying the reformed gas when the engine 1 is under high load is likely to cause knocking, so an alcohol passage is provided to directly supply alcohol from the fuel storage tank 2 to the engine 1. , unreformed alcohol may be supplied to the engine 1 during high loads.

<Embodiment 2> In this embodiment, only the main part is shown in FIG. 2, and the amount of water supplied to the fuel storage tank 2 is mechanically controlled.

That is, the water amount control mechanism of this example is based on the mixed fuel injection passage 4.
A rotating flow rate measuring plate 22 biased upstream by a spring 26 is attached as a flow rate measuring means 21 to the flow rate measuring means 21, while a rotating control valve 24 is provided to the water injection channel 6, and the flow rate measuring plate 220 The rotating shaft and the rotating shaft of the control valve 24 are connected by a connecting ring 25. Then, the flow rate measurement plate 22 rotates according to the flow rate of the mixed fuel, and the control valve 24 rotates.
rotates so that an appropriate amount of water is supplied to the fuel storage tank 2.

Note that methanol, ethanol, etc. can be used as the alcohol.

Therefore, according to the present invention, since the control valve is provided to control the amount of water ρ supplied to the fuel storage tank in accordance with the operation of the flow rate measuring means that measures the flow rate of the mixed fuel of alcohol and gasoline, the fuel storage Since the mixed fuel can be separated into two layers, alcohol and gasoline, in the tank, the mixed fuel can be used as is, and alcohol and gasoline can be supplied to the engine depending on the engine operating condition. The excellent effect of being able to achieve this is obtained.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the invention%@/Figure Fi Example/
FIG. 2 is a partially cutaway perspective view showing the main parts of the fuel supply system for an engine in Embodiment 2. FIG. 1...Engine,
2...Fuel storage tank, 4...Injection passage, 5...Water tank, 6...Injection channel,
7... Gasoline supply passage, 8... Alcohol supply passage, 11.21... Flow rate measuring means, 12.24... Control valve broom l Figure 1

Claims (1)

[Claims] (1) a fuel storage tank into which a mixed fuel of alcohol and gasoline is injected through an injection passage; a flow rate measuring means for measuring the flow rate of the mixed fuel flowing through the injection passage;
A control valve for controlling the amount of water supplied from the water tank to the fuel storage tank in accordance with the operation of the flow rate measuring means, and a control valve for controlling the amount of water to be supplied from the water tank to the fuel storage tank, and the gasoline and alcohol in the fuel storage tank that are separated by the water, respectively, through separate paths. 1. A fuel supply device for an engine, comprising a fuel supply passage for supplying fuel to the engine.