KR930002637Y1 - Ancillary fuel supply apparatus for alchol engine - Google Patents

Abstract

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Description

Auxiliary Fuel Supply of Alcohol Engine

1 is an overall configuration diagram of an auxiliary fuel supply device of an alcohol engine as a first embodiment of the present invention.

2 is a main configuration diagram showing an auxiliary fuel supply device for an alcohol engine as a second embodiment of the present invention.

3 and 4 are schematic diagrams for explaining the operation.

* Explanation of symbols for main parts of the drawings

1: main fuel tank 2: vaporizer

3: Float Room 3a: Float

4: auxiliary fuel tank 5: first electronic on-off valve

6: second electronic on-off valve 7: first auxiliary passage

8: second auxiliary passage 9: fuel supply passage

10: main well 10a: main well upper portion

11: junction 12,13: orifice

14: water temperature sensor (switch) 15: key switch start position detection sensor

16 control means (control circuit) 17 key switch ignition position detection sensor

18: Choke Bucket 19: Choke Wire

20: air filter 21: choke valve

22: throttle valve 23: Venturi part

24,25 passage 26 ': nozzle

27: combustion chamber 28: fuel pump

29: rotary valve 29a: valve

30: assembly passage 31: connection part

32: intake passage FS: fuel supply mechanism

The present invention relates to an auxiliary fuel supply device for an engine based on alcohol.

Generally, in an alcohol engine that uses 100% alcohol other than methanol, ethanol, or the like, or an alcohol that does not contain an additive containing a low temperature boiling point component, the engine starts to be cooled (hereinafter referred to as a cold start). And warm-up become particularly difficult due to the characteristics of the alcohol which is difficult to ignite compared to gasoline.

In other words, alcohol has a higher latent heat of vaporization than gasoline, is composed of a single component that does not contain a low temperature boiling point component, and has a high flammability characteristic, so that alcohol engines have difficulty in starting and cooling up in a cold state. have.

On the other hand, although it is proposed to supply a small amount of gasoline upstream of the venturi part of a vaporizer | carburetor, in this case, the atomization of gasoline as another kind of fuel is not fully performed, and the quantity of gasoline supplied is less than the amount of alcohol. And, there is a problem that a sufficient atomization effect is not obtained.

On the other hand, it is proposed to introduce a small amount of gasoline directly into the fuel supply passage of the carburetor in view of improving the atomization, but in such an apparatus, the supply system is one system, and the auxiliary fuel amount at the start of the cold state and at the time of warming up is proposed. There is always a problem that only a certain amount is supplied and that the required auxiliary fuel amount during cold start and the required auxiliary fuel amount during warm-up cannot be coped with each other. .

The present invention has been made to solve these problems, by supplying a different amount of auxiliary fuel corresponding to the cold start and warm-up of the alcohol engine at the start, the heterogeneous fuel having higher combustibility than the alcohol is mixed with the alcohol The auxiliary fuel supply of the alcohol engine, which facilitates start-up by supplying the fuel supply mechanism and promotes warm-up by making the fuel a mixed ratio of alcohol and heterogeneous fuel even after starting in the engine cooling state. It is an object to provide a device.

For this reason, the auxiliary fuel supply device of the alcohol engine of the present invention includes a main fuel tank for storing alcohol and an auxiliary fuel tank for storing heterogeneous fuel having a higher combustibility than alcohol in an engine having alcohol as a main fuel. At the same time, a main passage for supplying alcohol from the main fuel tank to the fuel supply mechanism to the engine, and an auxiliary passage communicating with the auxiliary fuel tank and the main passage, the auxiliary passage being the auxiliary fuel tank and the main passage; The first and second auxiliary passages are connected to each other in parallel, and valves are provided in these auxiliary passages, respectively, and the ratio of the amount of heterogeneous fuel to the amount of alcohol in the fuel supplied to the engine is determined during cold start of the engine. In case of warming-up and in case of warm-up, these on / off valves are selectively operated at cold start and warm-up of the engine or at both directions. The key is characterized in that a control means is provided.

Since the auxiliary fuel supply device of the alcohol engine of the present invention is constituted as described above, at the time of cold start and warm-up of the alcohol engine, the ratio of the amount of heterogeneous fuel to the amount of alcohol in the fuel supplied to the engine is different. Controlled.

Referring to the embodiment of the present invention with reference to the drawings, Figure 1 is an overall configuration diagram of the auxiliary fuel supply device of the alcohol engine as a first embodiment of the present invention, Figures 2 to 4 is a second embodiment of the present invention The auxiliary fuel supply apparatus of the alcohol engine as an example is shown, FIG. 2 is a block diagram showing the main part thereof, and FIG. 3 and FIG. 4 are schematic diagrams for explaining the operation thereof.

As shown in FIG. 1, in the first embodiment of the present invention, a main fuel tank 1 for storing alcohol is provided, which is a float of the vaporizer 2 as a fuel supply mechanism FS. The chamber 3 is supplied while adjusting the alcohol as the main fuel with the float 3a.

Moreover, the auxiliary fuel tank 4 which stores the gasoline as a different fuel is provided, The tank 4 has the 1st auxiliary | assistant channel | path 7 provided with the 1st electromagnetic switching valve 5, and the 2nd electromagnetic opening / closing. Gasoline can be supplied to the upper portion 10a of the main well 10, which is a part of the fuel supply passage 9 of the vaporizer 3, through the second auxiliary passage 8 provided with the valve 6.

Moreover, between the first and second auxiliary passages 7, 8 and the auxiliary fuel tank 4, an assembly for collecting the first and second auxiliary fuel passages 7, 8 and connected to the auxiliary fuel tank 4 The passage 30 is provided.

Each of these passages 7, 8, 30 constitutes an auxiliary fuel passage.

For this reason, the auxiliary fuel passage has a configuration having two system diagrams.

Here, the first and second electronic on-off valves serve as auxiliary fuel adjusting means for adjusting the amount of auxiliary fuel flow in the auxiliary fuel passage.

And in the junction part 11 which adjoins the upper part 10a of the main well 10, the 1st auxiliary passage 7 and the 2nd auxiliary passage 8 are joined, and it is an upstream side than this junction 11 An orifice 12 having a large diameter is provided in the first auxiliary passage 7, and an orifice 13 having a smaller diameter is provided in the second auxiliary tubing 8 that is upstream from the joining portion 11. .

In other words, the flow rate in the first auxiliary passage is set to be larger than the flow rate in the second auxiliary passage 8.

The first and second electromagnetic on / off valves 5 and 6 are normally in a closed state, so that the temperature detection signals of the engine coolant to the lubricating oil from the water temperature sensor 14 are below a predetermined temperature (for example, 60 ° C.), When the engine automatic detection signal is received from the key switch start position detection sensor 15, the control signal (control circuit) 16 enters the open state in association with the engine start by the control signal.

In addition, since the second electromagnetic on-off valve 6 is always in an open state, the engine coolant to lubricating oil temperature detection signal from the water temperature sensor 14 is equal to or less than a predetermined temperature (for example, 60 ° C), and the key switch ignition When the engine operation detection signal from the position detection sensor 17 is received, the control signal from the control means 16 enters the open state in association with the engine warm-up (cold state).

At this time, the first opening / closing valve 5 is in a closed state.

The key switch start position detection sensor 15 and the key switch ignition position detection sensor 17 constitute a key switch for detecting the position of the ignition key.

Here, a knock sensor may be provided in the engine, and when the knock state of the engine is detected by the knock sensor, an opening control signal is supplied to the first and second electromagnetic on / off valves 5 and 6.

The main well 10 receives the alcohol from the float chamber 3 and at the same time the first auxiliary passage 7 and the electronic on / off valve 6 with the electronic on / off valve 5 from the auxiliary fuel tank 4. By receiving gasoline through the two auxiliary passages 8, the gasoline amount G to the alcohol amount A can be adjusted to be close to an appropriate mixing ratio (for example, G: A = 1: 9).

This mixing ratio adjustment is mainly performed by the orifices 12 and 13 of the first and second auxiliary passages 7, 8.

The mixed fuel is supplied to the nozzle 26 of the venturi portion 23 of the intake passage 32 through the main well 10 of the fuel supply passage 9.

The throttle valve 22 is provided in the intake passage 32 downstream from the venturi portion 23, and the amount of the mixed fuel supplied to the combustion chamber 27 is adjusted by the throttle valve 22.

On the other hand, the fuel pump 28 may be provided in the assembly passage 30 between the auxiliary fuel tank 4 and the connecting portion 31 of the first and second auxiliary passages 7, 8.

Reference numeral 18 denotes a choke button, 19 a choke wire, 20 an air filter, 21 a choke valve, and 24 and 25 a passage.

The alcohol engine auxiliary fuel supply device as the first embodiment of the present invention is constructed as described above, so that at the cold start of the engine, the first and second electromagnetic on / off valves 5 and 6 are opened, respectively, are mixed so that the main well 10 gasoline amount G ₁ is expected ratio X (= G ₁ / a) to the alcohol amount a by being sent to the gasoline carburetor (2) through the (12, 13).

Then, the mixed fuel is sent to the venturi portion 23 of the vaporizer 2, so that atomization of gasoline is also performed appropriately, and the engine can be easily started.

Then, when the start (cranking) state of the engine ends and the engine moves to the warm-up state, the first electronic on-off valve 5 is closed and the second electronic on-off valve 5 is kept open. The gasoline passing through the orifice 13 is sent to the main well 10 of the vaporizer 2, so that the gasoline amount G ₂ (<G ₁ ) with respect to the alcohol amount A is adjusted to the ration ratio Y (= G ₂ / A < It is mixed so that it becomes X).

And this mixed fuel is sent to the venturi part 23 of the vaporizer | carburetor 2, atomization of gasoline is performed suitably, and the engine warms up.

When the warm-up of the engine is accelerated, the temperature detection signal from the water temperature sensor 14 becomes larger than the predetermined temperature (60 ° C.), and the second electronic on-off valve 6 is closed to operate the main well 10 of the vaporizer 2. ) Is not supplied with gasoline, and the amount of alcohol supplied increases accordingly, so that atomization of the fuel from the venturi portion 23 is performed appropriately.

By the way, the 1st and 2nd electromagnetic shut-off valves 5 and 6 may be selectively operated at the time of cold start and warm-up of an engine.

In addition, when the engine is stopped for some reason after the engine is started, the control means 16 closes the first and second electromagnetic on / off valves 5 and 6, thereby bringing it into the main well 10 of the gasoline fuel. The supply of is stopped. In such a case, therefore, fuel with too high a proportion of gasoline is not supplied, and restart performance is improved.

When the temperature of the engine is higher than the predetermined value, the gasoline fuel is supplied to the main passage 9 because the first and second electromagnetic on / off valves 5 and 6 remain closed while the engine is cranked and after the engine is started. In this case, however, there is no storage since the engine can be operated with only alcohol fuel.

Here, at the time of knocking of the engine, the first and second electromagnetic on / off valves 5 and 6 are closed by the knock detection signal from the knock sensor, and as in the case of the cold start of the engine or the warming-up of the engine described above, The vaporizer 2 is sent to the main well 10 of the vaporizer 2 and a mixed fuel of alcohol and gasoline is sent to the engine, thereby preventing knocking of the engine.

In the second embodiment of the present invention, as shown in Figs. 2 to 4, the connecting portion 31 of the collecting passage 30, the first auxiliary passage 7 and the second auxiliary passage 8, The rotary valve 29 as an open / close valve is provided, and the valve body 29a of the rotary valve 29 is directly driven to rotate by a stepping motor (not shown).

In the valve body 29a, as shown in FIG. 2, the state at the time of cold start of the engine which supplies a large amount of gasoline to the main well 10, and the small amount of gasoline as shown in FIG. The engine is warmed up properly while the engine is warmed up without supplying gasoline such as the wheel shown in FIG. 4 to the main well 10 as shown in FIG. As a result, the ratio of the amount of gasoline to the amount of alcohol in the fuel supplied from the main well 10 to the intake passage 32 through the venturi portion 23 of the vaporizer 2 is appropriately controlled as in the first embodiment. will be.

And the rotation state of this valve 29a is controlled by the control means 16 in response to detection signals, such as a position of a key switch and the cooling water temperature of an engine.

Here, the valve 29a may be driven by the solenoid via the link mechanism.

In this embodiment as well, almost the same effects as in the first embodiment can be obtained.

Here, as the different fuels, liquid fuels such as light naphtha, cetyl ether, N-pentane and isopentane are used.

As the different fuel, a gaseous fuel such as propane or LPG may be used. In this case, for example, the intake passage 32 side of the flow path 25 is connected to a gaseous fuel supply source, and gaseous fuel is mixed with alcohol to vaporize the vaporizer. It is supplied to the venturi part 23 of (2).

As the fuel supply mechanism FS, an injector (injection valve) type may be used. In this case, for example, the first and second auxiliary passages may be provided such that different fuels are supplied to the fuel supply passage on the upstream side of the fuel pressure regulator. 7,8) are connected, and alcohol and a different fuel are mixed and then supplied from the injector to the intake passage.

As described above, according to the auxiliary fuel supply device of the alcohol engine of the present invention, the following effects or advantages can be obtained.

(1) During cold start of the alcohol engine, by supplying a predetermined ratio mixed fuel of alcohol and heterogeneous fuel having a higher combustibility than alcohol from the fuel supply mechanism to the intake passage, the engine can be easily started and the engine At the time of warming-up, there is an advantage in that economic warming-up can be promoted while preventing the excessive supply of the amount of heterogeneous fuels by using a mixed fuel in which the ratio of the alcohol and the heterogeneous fuel at the time of cold start is different.

(2) Since the sum of the amount of alcohol and the amount of heterogeneous fuel supplied from the fuel supply mechanism to the intake passage is a fixed amount, the amount of alcohol corresponding to the amount of heterogeneous fuel to be mixed is reduced, and the amount of alcohol to be atomized with the increase of the amount of heterogeneous fuel is reduced. do.

(3) When gasoline is used as a heterogeneous fuel, the gasoline atomization is always good, and the gasoline atomization device is not necessary.

(4) The driving ability at the time of warming up is improved, and wear corrosion and deposition can be prevented.

Claims (1)

An engine using alcohol as a main fuel, comprising a main fuel tank (1) for storing alcohol and an auxiliary fuel tank (4) for storing heterogeneous fuel having a higher combustibility than alcohol, and the alcohol from the main fuel tank. A fuel supply passage 9 of a carburetor for supplying fuel to the intake passage of the engine, and auxiliary passages 7 and 8 for communicating the auxiliary fuel tank and the fuel supply passage, the auxiliary passage being the auxiliary fuel tank. First and second auxiliary passages (7, 8) for connecting the main passages in parallel to each other, and opening / closing valves (5, 6) are provided in these auxiliary passages, respectively, and the amount of alcohol in the fuel supplied to the engine. The ratio of the amount of heterogeneous fuel to the fuel is set to a different value in the case of cold start of the engine and in the case of warming up, and the control of operating these on / off valves selectively or both simultaneously during cold start and warm-up of the engine. Auxiliary fuel supply device for an alcohol engine, characterized in that the means (16) are provided.