JP2012082761A - Biofuel and light oil switching system for diesel engine loading vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biofuel and light oil switching system, for switching the fuel supply to a diesel engine, in which the light oil and 100% biofuel are used, as needed, in combination while switching as the fuel for the diesel engine without being against the laws such as the present light oil delivery tax or Act on the Quality Control of Gasoline and Other Fuels, and in a next-generation diesel engine, the running with 100% biofuel is possible by preventing the trouble of the engine.SOLUTION: The biofuel and light oil switching system for a diesel engine loading vehicle has: a light oil tank; a biofuel tank; a mixed oil tank storing a mixed oil of the light oil with the biofuel; a fuel switching valve for switching the fuel supplied to the engine to any one of the light oil and the biofuel; and a fuel return valve switching the return direction of the fuel from a fuel injection pump to any one of the light oil tank, the biofuel tank and the mixed oil tank.

Description

The present invention relates to an apparatus for supplying fuel to an internal combustion engine for a vehicle (diesel engine). More specifically, in a vehicle equipped with a diesel engine, both tanks of 100% biofuel and light oil are used together and used. The present invention relates to a biofuel / light oil switching system that can be easily switched without mixing any other fuel.

In the “light oil collection tax”, attempts to use diesel engines equipped with 100% biomass fuel spread from the legal interpretation that all biofuels mixed with light oil are subject to the light oil collection tax. The 2009 revision of the “Law Concerning Quality Assurance of Volatile Oil” revised the upper limit of the mixing ratio of biofuel to light oil to 5%, and those fuel mixers required pre-registration. However, the use of 100% biofuel was noted because it was not restricted by the amendment. Also, people's environmental awareness is behind the use of biofuels.

Here, the biofuel is a general term for diesel engine fuel refined from biological oil. Specifically, there is tempura oil used at home. The biofuel is obtained by refining it by subjecting it to chemical treatment such as methyl esterification in order to remove glycerin from the raw oil and fat. And it is estimated that the amount of carbon dioxide emission will be smaller than that of running with light oil. On the other hand, when the refining treatment is insufficient, the raw material fats and oils remain and there is a risk that the engine system will be hindered.

On the other hand, in order to comply with exhaust gas regulations, development of vehicles equipped with next-generation diesel engines has been progressing in recent years. Vehicles equipped with next-generation diesel engines include a “common rail system” that completely burns fuel, an “exhaust particulate removal device (DPF)” that collects particulate matter (PM) in exhaust gas, and nitrogen oxides (NOx) in exhaust gas. "Exhaust gas recirculation system (EGR)" that reduces emissions, and by combining them, the exhaust gas is adapted to the standards of the NOx / PM method.

  Users have pointed out problems when using 100% biofuel in vehicles equipped with next-generation diesel engines. It is often pointed out that when 100% biofuel is used, a large amount of fuel is mixed into the engine oil, causing vehicle failure. As a result, the use of biofuels in vehicles equipped with next-generation diesel engines has been abandoned.

  In fact, the inventor used a 100% biofuel in a vehicle equipped with a next-generation diesel engine (manufactured by Hino Motors, common rail system, DPF, EGR, 2 garbage collection vehicles). During the test run (955 km), an engine abnormality warning light was lit and inspected, and biofuel was mixed into the engine oil, and the amount was about twice that of normal. On the other hand, the engine warning light did not blink, but it was about 1.5 times the normal engine oil amount during the same period (experimental run 1433 km).

  On the other hand, in the vehicle equipped with the old generation diesel engine before the development of the next generation diesel engine, the problem of biofuel mixing into the engine oil did not occur. However, production of old-generation diesel engine-equipped vehicles has ended in the course of tightening exhaust gas regulations.

  In vehicles equipped with next-generation diesel engines, the cause of fuel contamination in engine oil may be the operation of the exhaust brake (exhaust throttle valve) during self-regeneration of the exhaust filter (burning the exhaust particulates by heating the exhaust filter) ing.

  Many vehicles equipped with an exhaust particulate removal device (DPF) automatically perform PM combustion work when stopped (during engine idling), but if this automatic PM combustion work fails to incinerate manually ( Work instructions with warning lights). In this case, in order to raise the temperature of the DPF filter (oxidation catalyst) to the PM incineration temperature (about 500 ° C.), the engine speed at the time of normal idling is about 600 rpm / minute, but automatically up to about 1,200 rpm / minute. In addition, by automatically operating the exhaust brake (exhaust throttle valve depending on the vehicle model) and injecting fuel light oil (hydrocarbon oil) into the exhaust gas (post-injection), light oil and oxidation catalyst filter The heat of reaction increases to the incineration temperature of PM.

  When fuel (light oil) is injected into this exhaust gas (post-injection), the exhaust brake (exhaust throttle valve) is actuated to efficiently raise the temperature of the filter, but some of the fuel injected into the exhaust gas Since the fuel adhering to the cylinder wall is compressed, it seems to be mixed into the engine oil.

  The biggest cause of 100% biofuel mixing into engine oil is that the self-regeneration of the exhaust filter is not able to obtain the reaction heat with the oxidation catalyst filter with biofuel, so this work may be performed for a long time. ing. In the self-regeneration of the exhaust filter, even when 100% biofuel is used as the fuel, the biofuel is post-injected into the exhaust gas immediately after the explosion stroke. However, with 100% biofuel, reaction heat with the oxidation catalyst filter in the muffler cannot be obtained, and the temperature of the filter does not reach the combustion temperature of PM, so that the self-regeneration operation is continued for a long time.

  I think that 100% biofuel may be mixed into engine oil in a large amount due to the long self-regeneration work. When post-injection is performed using light oil as fuel, the self-regeneration work of the exhaust filter is 15 minutes to 20 minutes, so that the amount of light oil mixed into the engine oil is within an allowable range. (In addition to the conventional MAX line, the engine oil level gauge is engraved with an increased MAX line. When the engine oil level is increased beyond this level, the engine abnormality warning light is turned on.)

  On the other hand, inventions such as Patent Document 1 are disclosed as vehicles using biofuel. In either case, the fuel is simply one that uses 100% biofuel as an engine fuel, or one that is simply mixed with light oil in biomass fuel and used as engine fuel. No consideration is given to biofuel contamination in engine oil in vehicles equipped with next-generation diesel engines.

Japanese Patent Publication No. 2009-41476

  Therefore, the present invention does not violate the current light oil take-off tax or the law on ensuring the quality of volatile oil, etc., and diesel oil and 100% biofuel (hereinafter sometimes simply referred to as “biofuel”) are diesel. It is an object of the present invention to provide a biofuel / light oil switching system that can be used as a fuel for an engine at any time and that can be driven by 100% biofuel while avoiding engine troubles in a next-generation diesel engine.

  In order to solve the above problems, the present invention provides a light oil tank that stores light oil, a biofuel tank that stores biofuel, a mixed oil tank that stores mixed oil in which light oil and biofuel are mixed, and a light oil supply pipe Connected to the light oil tank via a biofuel refueling pipe, connected to the biofuel tank via a fuel refueling pipe provided with a combustion filter and a fuel injection pump, and supplied to the engine A fuel switching valve for switching to either light oil or biofuel, a fuel return pump connected to the fuel injection pump, a light oil return pipe connected to the light oil fuel tank, and a biofuel return pipe Connected to the biofuel tank, connected to the mixed oil tank via a mixed oil feed pipe, and the return direction of fuel from the fuel injection pump to the light oil tank or biofuel A biofuel / light oil switching system for a diesel engine-equipped vehicle having a fuel return valve that switches to either a tank or a mixed oil tank, wherein (1) when the fuel supplied to the engine is biofuel, the fuel switching The valve connects the biofuel supply pipe and the fuel supply pipe, the fuel return valve connects the biofuel return pipe and the fuel return pipe, and (2) when the fuel supplied to the engine is light oil, the fuel switching The valve connects the light oil supply pipe and the fuel supply pipe, the fuel return valve connects the light oil return pipe and the fuel return pipe, and (3) when switching from biofuel to light oil, the fuel switching valve is connected to the light oil The fuel supply pipe communicates with the fuel supply pipe, the fuel return valve communicates with the mixed oil tank liquid supply pipe and the fuel return pipe for a certain period of time. (4) When switching from light oil to biofuel, the fuel switching valve Communicated biofuel feeding pipe and the fuel oil supply pipe, the fuel Modoben was construction of biofuel and diesel switching system characterized by communicating a certain time the oil mixture tank liquid feed pipe and the fuel return pipe.

  Further, the fuel switching valve has a first cup having a bottom and an internal cavity and having seven holes on the side wall, a first rotor provided with a passage fitted into the cavity and having two outlets therein, A first lid fixed to the opening surface side of the first cup, a shaft that rotates the first rotating body, and a switching lever that is connected to the shaft on the first lid side and rotates the shaft; The fuel supply pipe, the light oil supply pipe, and the biofuel supply pipe are connected to the separate holes, and the rotating body is rotated to communicate the passage, the fuel supply pipe, the light oil supply pipe, or the biofuel supply pipe. The biofuel / light oil switching system described above is characterized in that the fuel to be fed to the fuel supply pipe is selected from light oil or biofuel.

  In addition, the fuel return valve is provided with a second cup having a bottom and an inner cavity and having seven holes on a side wall, and a passage fitted into the cavity and having two outlets therein, together with the first rotating body. The second rotating body rotated by the switching lever and a second lid fixed to the opening surface side of the second cup, and the fuel return pipe, the light oil return pipe, and the biofuel return in separate holes. A pipe and a mixed oil feeding pipe are connected, the second rotating body is rotated, and the passage, the fuel return pipe, the light oil return pipe, the biofuel return pipe or the mixed oil feeding pipe are communicated, and the fuel injection The biofuel / light oil switching system according to any one of the above, wherein the fuel returned from the pump is switched to the light oil tank, the biofuel tank, or the mixed oil tank.

  The biofuel / light oil switching according to any one of the above, further comprising a driver's seat indicator that displays the situation of (1) to (4) or that the mixed fuel is full. The biofuel / light oil switching system according to any one of the above, wherein the system is configured to include a fuel gauge that displays the remaining amount of the light oil fuel tank and the biofuel tank. The display of the driver's seat indicator is connected and controlled by a rotary switch in conjunction with the operation of the fuel switching valve.

  In the present invention, at the time of fuel switching between 100% biofuel and light oil, the fuel remaining in the pipe or the like before the switching is stored in the mixed oil tank, and the fuel switching valve and the fuel return valve are appropriately controlled. Because the oil mixed with a part of the fuel is not used for diesel engine vehicles, it is not subject to laws related to ensuring the quality of diesel oil tax and volatile oil.

  Furthermore, even if the vehicle is equipped with a next-generation diesel engine, according to the present invention, even if the vehicle is driven by 100% biofuel, the fuel is switched to light oil during the self-regeneration mode of the exhaust filter. There is no problem with the engine system caused by fuel (fuel mixture in engine oil).

1 is a schematic diagram of a biofuel / light oil switching system for a vehicle equipped with a diesel engine according to the present invention. FIG. It is a schematic diagram which shows the flow of the fuel at the time of biofuel use, and the electrical connection of a meter. It is a schematic diagram which shows the fuel flow and electrical connection of a meter when switching from biofuel to light oil. It is a schematic diagram which shows the flow of the fuel at the time of light oil service use, and the electrical connection of a meter. It is a schematic diagram which shows the fuel flow and electrical connection of a meter when switching from light oil to biofuel. It is explanatory drawing (longitudinal section) of a fuel switching valve and a fuel return valve. It is a schematic diagram which shows the position of each fuel valve interlocked with the movement of a switching lever, and the state of electrical connection of an indicator (when using biofuel). It is a schematic diagram which shows the position of each fuel valve interlocked with the movement of the switching lever and the state of electrical connection of the indicator (when switching from biofuel to light oil). It is a schematic diagram which shows the position of each fuel valve interlocked with the movement of a switching lever, and the state of electrical connection of an indicator (when using light oil). It is a schematic diagram which shows the position of each fuel valve interlocked with the movement of a switching lever, and the state of electrical connection of an indicator (at the time of switching from light oil to biofuel). It is a control flow of the biofuel / light oil switching system according to the present invention.

  Hereinafter, a biofuel / light oil switching system for a diesel engine-equipped vehicle according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic diagram of a biofuel / light oil switching system for a vehicle equipped with a diesel engine according to the present invention. With reference to FIG. 1, the structure of this invention is demonstrated first.

The biofuel / light oil switching system 1 includes a light oil tank 2 for storing light oil 2a provided in a vehicle equipped with a diesel engine 5, a biofuel tank 3 for storing biofuel 3a, and a mixed oil in which light oil 2a and biofuel 3a are mixed. It consists of a mixed oil tank 4 that stores 4 a, a fuel switching valve 8, and a fuel return valve 9.

Further, the driver's seat is provided with a fuel gauge changeover switch 10 and an indicator changeover switch for linking the display of the fuel gauge 10a and the display of the indicator 12 with the fuel supply state.

  Each fuel passes through the existing fuel supply pipe 6 and is sent to the existing fuel filter 5a, the fuel injection pump 5b, and the diesel engine 5. The light oil 2 a is sent to the engine 5 through the light oil supply pipe 2 d connected to the fuel supply pipe 6 via the fuel switching valve 8. The biofuel 3 a is sent to the engine 5 through the biofuel supply pipe 3 d connected to the fuel supply pipe 6 via the fuel switching valve 8.

Each of the light oil tank 2 and the biofuel tank 3 is conventionally provided with a remaining amount sensor 2b and a fuel meter sensor 3b connected to the floats 2c and 3c for detecting the remaining amount of fuel. It is sent to the fuel gauge 10a via the changeover switch 10, and the fuel gauge 10a displays the remaining amount of fuel.

On the other hand, the mixed oil tank 4 is provided with an alarm sensor 4b connected to a float 4c that detects the amount of stored mixed oil 4a. When the storage amount of the mixed oil 4a in the mixed oil tank 4 reaches a predetermined amount, the alarm sensor 4b sends an electric signal to the mixed oil full tank display 12a via the indicator changeover switch 11, “Tan” indicator lights up.

Thereafter, the user opens the drain valve 4 d provided at the bottom of the mixed oil tank 4, and extracts the mixed oil 4 a from the mixed oil tank 4. The signal from the alarm sensor 4b may be a means such as a buzzer that informs the user such as the driver that the mixed oil 4a is being stored in the mixed oil tank 4.

  As the indicator 12, in addition to the mixed oil full tank display 12a, the fuel switching valve 8, the fuel return valve 9, and the fuel gauge switching switch 10 are linked to the movement of the indicator switching switch 11 to control the biofuel. 3b is in use as a fuel for the engine 5 to notify the user that the biofuel is in use display 12b, the state of switching from the biofuel 3a to the light oil 2a, and the operation must be stopped The user is informed that the operation is prohibited from being performed while the biofuel is switched from the biofuel to the light oil switch display 12c, the light oil 2a is switched to the biofuel 3a, and the operation is to be stopped. Switching from light oil to biofuel display, such as “Prohibit operation while discharging light oil → bio light oil” 2d, comprises a light oil in use display 12e for displaying the inform users "light oil in use" that are using the diesel 2a as an engine 5 fuel. Then, for display, the lamp is turned on to highlight various characters. Other display methods such as digital character scrolling may be used.

Note that B− and B + in FIG. 1 mean a negative terminal and a positive terminal of the battery. The interlock control of the fuel switching valve 8, the fuel return valve 9, the fuel gauge switching switch 10, and the indicator switching switch 11 will be described later.

A part of the fuel that has not been sent from the fuel injection pump 5b to the engine 5 passes through the existing fuel return pipe 7 and is determined from various tanks by the control of the fuel return valve 9 according to the fuel usage status. The liquid is sent to the tank.

A pipe used for feeding the various return tanks from the fuel return pipe 7, that is, a pipe connecting the fuel return valve 9 and the light oil tank 2 via the fuel return valve 9 is connected via the light oil return pipe 2 e and the fuel return valve 9. The pipe connecting the fuel return valve 9 and the biofuel tank 3 is the biofuel return pipe 3e, and the fuel is supplied via the fuel return valve 9 when switching from the light oil 2a to the biofuel 3a and when switching from the biofuel 3a to the light oil 2a. A pipe for feeding the mixed oil tank 4 is a mixed oil feeding pipe 4e.

  Next, with reference to FIG. 2 to FIG. 5, the fuel usage status and the flow of fuel at the time of switching will be described.

FIG. 2 is a schematic diagram showing the fuel flow and the electrical connection of the instrument when using biofuel. The line indicated by the bold line indicates that the current fuel flow and the instrument are electrically connected. An arrow indicates the direction of flow. The fuel in use and the display are colored in gray. The same applies to FIGS.

When the fuel supplied to the engine 5 is the biofuel 3a, the fuel switching valve 8 causes the biofuel supply pipe 3d and the fuel supply pipe 6 to communicate with each other. The fuel return valve 9 causes the biofuel return pipe 3e and the fuel return pipe 7 to communicate with each other. The fuel gauge changeover switch 10 electrically connects the fuel gauge sensor 3b and the fuel gauge 10a. The indicator changeover switch 11 electrically connects the battery and the biofuel in-use display 12b.

FIG. 3 is a schematic diagram showing the fuel flow and the electrical connection of the instrument when switching from biofuel to light oil. When switching from the biofuel 3a to the light oil 2a, the fuel switching valve 8 causes the light oil supply pipe 2d and the fuel supply pipe 6 to communicate with each other. The fuel return valve 9 allows the mixed oil feed pipe 4e and the fuel return pipe 7 to communicate with each other for a predetermined time. The fuel gauge changeover switch 10 electrically connects the remaining amount sensor 2b and the fuel gauge 10a. The indicator changeover switch 11 electrically connects the light oil changeover display 12c from the battery and the biofuel. At this time, the vehicle is not allowed to travel. After a certain period of time, the fuel return valve 9 causes the light oil return pipe 2e and the fuel return pipe 7 to communicate with each other. Since the fixed time varies depending on the length of the pipe, an optimal time is set in advance for each vehicle type. The fixed time is the same when switching from light oil 2a to biofuel 3a.

FIG. 4 is a schematic diagram showing the flow of fuel and the electrical connection of the instrument when using light oil. When the fuel supplied to the engine 5 is light oil 2a, the fuel switching valve 8 causes the light oil supply pipe 2d and the fuel supply pipe 6 to communicate with each other. The fuel return valve 9 causes the light oil return pipe 2e and the fuel return pipe 7 to communicate with each other. The fuel gauge changeover switch 10 electrically connects the remaining amount sensor 2b and the fuel gauge 10a. The indicator changeover switch 11 electrically connects the battery and the light oil in-use display 12e.

FIG. 5 is a schematic diagram showing the fuel flow and electrical connection of the instrument when switching from light oil to biofuel. When switching from the light oil 2a to the biofuel 3a, the fuel switching valve 8 causes the biofuel supply pipe 3d and the fuel supply pipe 6 to communicate with each other. The fuel return valve 9 causes the mixed oil feed pipe 4e and the fuel return pipe 7 to communicate with each other for a predetermined time. The fuel gauge changeover switch 10 electrically connects the fuel gauge sensor 3b and the fuel gauge 10a. The indicator changeover switch 11 electrically connects the biofuel changeover indication 12d from the battery and light oil. At this time, the vehicle is not allowed to travel. After a predetermined time has elapsed, the fuel return pipe 7 causes the biofuel return pipe 3e and the fuel return pipe 7 to communicate with each other.

  Next, the structure of the fuel switching valve 8 and the fuel return valve 9 will be described in detail with reference to FIG. Although an example of the fuel switching valve is shown in FIG. 6, it is not limited to this. 6A is a plan view of the switching valve, FIG. 6B is a cross-sectional view taken along line AA in FIG. 6A, and FIG. 6C is a cross-sectional view taken along line BB in FIG.

The fuel switching valve 8 includes a first cup 8d having a bottom and an internal cavity and seven holes 8i on the side wall, and a passage 8g fitted into the cavity and having two outlets 8h inside. 8e, a first lid 8c fixed to the opening surface side of the first cup 8d, a shaft 8b for rotating the rotating body 8e, and a switching lever 8a connected to the shaft 8b on the first lid 8c side for rotating the shaft 8b. It consists of.

  Then, the fuel supply pipe 6, the light oil supply pipe 2d, and the biofuel supply pipe 3d are connected to the separate holes 8i, and the first rotating body 8e is rotated to pass the passage 8g, the fuel supply pipe 6, the light oil supply pipe 2d, or the biofuel supply. The fuel to be fed to the fuel supply pipe 6 is selected from the light oil 2a or the biofuel 3a by connecting the pipe 3d. The hole 8i is connected to the pipe 8m, and each pipe is connected to the pipe 8m.

In addition, the position where each piping connects corresponds with the position of the connection line which means the connection of piping of the fuel switching valve 8 shown in FIGS. Since the passage 8g has a substantially cross-sectional (B) L-shape, the light oil supply pipe 2d and the biofuel supply pipe 3d have two different pipes 8m (holes 8i) as shown in FIGS. Connect each one.

The remaining three pipes 8m (holes 8i) are all connected to the fuel supply pipe 6 through the connecting pipe 8k. As a result, the four modes of use of light oil, BDF (biofuel), light oil discharge (light oil → biofuel switching), and BDF discharge (biofuel → light oil switching) described on the surface of the first lid 8c can be switched. . The lid 8c and the first rotating body 8e are sealed with an O-ring 8f.

The fuel return valve 9 is provided with a second cup 9d having a bottom and an internal cavity and having seven holes 9i on the side wall, and a passage 9g fitted into the cavity and having two outlets 9h therein. It consists of the 2nd rotary body 9e rotated by the switching lever 8a with 8e, and the 2nd lid | cover 9c fixed to the opening surface side of the 2nd cup 9d.

Then, the fuel return pipe 7, the light oil return pipe 2e, the biofuel return pipe 3e, and the mixed oil feed pipe 4e are connected to the separate holes 9i, and the second rotating body 9e is rotated to pass the passage 9g, the fuel return pipe 7 and the light oil. The return pipe 2e, the biofuel return pipe 3e, or the mixed oil feed pipe 4e is connected to switch the fuel returned from the fuel injection pump 5b to the light oil tank 2, the biofuel tank 3, or the mixed oil tank 4. The hole 9i is connected to the pipe 9m, and each pipe is connected to the pipe 9m.

In addition, the position where each piping connects corresponds with the position of the connection line which means the connection of piping of the fuel return valve 9 shown in FIGS. Since the passage 9g has a substantially L-shape like the passage 8g, the mixed oil feeding pipe 4e has two different pipes 9m (holes 9i) as shown in FIGS. Connecting.

The remaining three pipes 9m (holes 9i) excluding the light oil return pipe 2e and the pipe 9m connected to the biofuel return pipe 3e are all connected to the fuel return pipe 7 via a connection pipe 9k similar to the connection pipe 8k. Connecting. As a result, the four modes of use of light oil, BDF (biofuel), light oil discharge (light oil → biofuel switching), and BDF discharge (biofuel → light oil switching) described on the surface of the first lid 8c can be switched. . The second lid 9c and the second rotating body 9e are sealed with an O-ring 9f.

  Next, the interlocking of the fuel switching valve 8, the fuel return valve 9, the fuel gauge switching switch 10, and the indicator switching switch 11 will be described in detail with reference to FIGS.

  FIG. 7 is a schematic diagram showing the position of each fuel valve in conjunction with the movement of the switching lever and the state of electrical connection of the indicator (when using biofuel). (A) is the plane of the lid 8c of the fuel switching valve 8, (B) is the cross section of the fuel switching valve 8, (C) is the cross section of the fuel return valve 9, (D) is the plane of the fuel gauge switching switch 10, (E ) Is a plan view of the indicator switch 11. As the switching lever 8a rotates, the rotating bodies 8e and 9e (passages 8g and 9g) and the rotating bodies 10b and 11b (bypass terminals 10c and 11c) rotate in conjunction with each other about the shaft 8b. The arrows in the figure indicate the direction of fuel flow. The same applies to FIGS.

  In FIG. 7, when the switching lever 8 a is directed to use BDF (use of biofuel), the biofuel 3 a is supplied from the biofuel tank 3 to the engine 5 at the fuel switching valve 8 (B). In the fuel return valve 9 (C), the biofuel 3 a is sent from the fuel injection pump 5 b to the biofuel tank 3.

  The fuel gauge changeover switch 10 and the indicator changeover switch 11 are so-called rotary switches having the same configuration. Rotating bodies 10b and 11b rotating with the rotation of the shaft 8b, bypass terminals 10c and 11c fixed to the rotating bodies 10b and 11b, and rings 10g and 11g and rings 10g and 11g arranged on the outer periphery of the rotating bodies 10b and 11b. 7 terminals 10d and 11d fixed to each other, and terminals 10d and 11d and lead wires 10e and 11e connecting the respective instruments.

  Further, in the fuel gauge changeover switch 10, the three terminals 10d are connected to the fuel gauge 10a via the lead wire 10f. The remaining four terminals 10d are connected to the remaining amount sensor 2b of the light oil tank 2 and the fuel gauge sensor 3b of the biofuel tank 3, respectively. The sensor and the fuel gauge 10a are electrically connected and controlled by the bypass terminal 10c. In the indicator switch 11, the three terminals 11d are connected to the battery (−) 11a via the lead wire 11f.

In addition, the position to which each lead wire connects is in agreement with the position of the connection line which means the terminal of the fuel meter change-over switch shown in FIGS. In addition, lead wires 10e and 11e indicated by solid lines in the drawing indicate electrical connection.

  In the fuel gauge changeover switch 10 (D) of FIG. 7, the fuel gauge sensor 3b of the biofuel tank 3 and the fuel gauge 10a are electrically connected by a bypass terminal 10c. Therefore, the user can know the remaining amount of the biofuel 3a while using the biofuel 3a.

  In the indicator changeover switch 11 (E) of FIG. 7, the battery (−) 11a and the biofuel in-use display 12b are electrically connected by a bypass terminal 11c. Therefore, the user can know that the vehicle is running on the biofuel 3a.

FIG. 8 is a schematic diagram showing the position of each fuel valve interlocked with the movement of the switching lever and the state of electrical connection of the indicator (when switching from biofuel to light oil).

In FIG. 8, when the switching lever 8 a is directed to BDF discharge (switching from biofuel to light oil), the light oil 2 a is supplied from the light oil tank 2 to the engine 5 at the fuel switching valve 8 (B). In the fuel return valve 9 (C), the mixed oil 4 a is sent from the fuel injection pump 5 b to the mixed oil tank 4.

  In the fuel gauge changeover switch 10 (D) of FIG. 8, the remaining amount sensor 2b of the light oil tank 2 and the fuel gauge 10a are electrically connected by a bypass terminal 10c. Therefore, the user can know the remaining amount of light oil 2a from the time of fuel switching.

  In the indicator changeover switch 11 (E) in FIG. 8, a light oil changeover display 12c is electrically connected from the battery (−) 11a to the biofuel by a bypass terminal 11c. Therefore, the user can know that traveling is prohibited in this mode.

FIG. 9 is a schematic diagram showing the position of each fuel valve interlocked with the movement of the switching lever and the state of electrical connection of the indicator (when using light oil).

FIG. 9 is a schematic diagram showing the position of each fuel valve interlocked with the movement of the switching lever and the state of electrical connection of the indicator (when switching from biofuel to light oil).

In FIG. 9, when the switching lever 8 a is turned to use light oil, the light oil 2 a is supplied from the light oil tank 2 to the engine 5 at the fuel switching valve 8 (B). In the fuel return valve 9 (C), the light oil 2 a is sent from the fuel injection pump 5 b to the light oil tank 2.

  In the fuel gauge changeover switch 10 (D) of FIG. 9, the remaining amount sensor 2b of the light oil tank 2 and the fuel gauge 10a are electrically connected by a bypass terminal 10c. Therefore, the user can know the remaining amount of the light oil 2a.

In the indicator changeover switch 11 (E) in FIG. 9, the battery (−) 11a and the light oil in-use display 12e are electrically connected by a bypass terminal 11c. Therefore, the user can know that the vehicle is running with the light oil 2a.

FIG. 10 is a schematic diagram showing the position of each fuel valve interlocked with the movement of the switching lever and the state of electrical connection of the indicator (when switching from light oil to biofuel).

In FIG. 10, when the switching lever 8 a is directed to light oil discharge, the biofuel 3 a is supplied from the biofuel tank 3 to the engine 5 at the fuel switching valve 8 (B). In the fuel return valve 9 (C), the mixed oil 4 a is sent from the fuel injection pump 5 b to the mixed oil tank 4.

  In the fuel gauge changeover switch 10 (D) of FIG. 10, the fuel gauge sensor 3b of the biofuel tank 3 and the fuel gauge 10a are electrically connected by a bypass terminal 10c. Therefore, the user can know the remaining amount of the biofuel 3a from the time of fuel switching.

  In the indicator changeover switch 11 (E) of FIG. 10, the biofuel changeover indication 12d is electrically connected from the battery (−) 11a and the light oil via the bypass terminal 11c. Therefore, the user can know that traveling is prohibited in this mode.

  Next, referring to FIG. 11, the fuel switching flow from the start of the engine will be described. The driver of the diesel engine vehicle equipped with the biofuel / light oil switching system according to the present invention turns the cell with the key (IG ON) and starts the engine 5 (engine start).

  In FIG. 11, the vertical arrow in the determination step is “YES”, and the horizontal arrow is “NO”. The remaining amount of the biofuel 3a is determined. If biofuel is present (X> 0 (X is biofuel)), operation is started, and the remaining amount of biofuel 3a is determined periodically during operation.

  In the determination of the remaining amount of biofuel 3a, if it is determined that there is no biofuel 3a (X = 0), it is next determined whether or not there is a fuel supply facility for biofuel 3a. If there is a biofuel refueling facility, the biofuel 3a is refueled and the normal operation is resumed.

  On the other hand, if there is no biofuel refueling facility, the driver stops the vehicle and directs the switching lever 8a of the fuel switching valve 8 shown in FIGS. 7 to 10 to “BDF discharge” (FIG. 8). Then, idling is performed for a predetermined time, for example, 10 minutes. The predetermined idling time is determined in advance depending on the vehicle type.

  After a predetermined time has elapsed, the driver turns the switching lever 8a of the fuel switching valve 8 to “use light oil” (FIG. 9). Then, the remaining amount of light oil is determined. If the light oil 2a is present, the operation returns to the regular operation. If not, the light oil is supplied and then the normal operation is resumed.

  And the biofuel 3a is refueled during driving | running | working with the light oil 2a. Further, the remaining amount of the light oil 2a is periodically determined. When the light oil 2a is exhausted or after the biofuel 3a is supplied, the switching lever 8a of the fuel switching valve 8 is directed to “light oil discharge” (FIG. 10). Then, idling is performed for a predetermined time, for example, 10 minutes. The predetermined idling time is determined in advance depending on the vehicle type. Thereafter, the switching lever 8a of the fuel switching valve 8 is directed to “use BDF” (FIG. 7). And it returns to normal operation. Hereinafter, the above steps and determinations are repeated.

  In the present invention, by using 100% biofuel and light oil in combination, even when biofuel is used in a vehicle equipped with a next-generation diesel engine, it is possible to maintain the fuel in the engine oil at a level that can be ignored.

  In the present invention, even in a vehicle equipped with a next-generation diesel engine, biofuel refined from waste oil can be used to drive the engine. Therefore, the utility value of biofuel can be increased and environmental addition can be reduced. . This will greatly contribute to waste oil processing technology and environmental technology. Furthermore, it can contribute to the reduction of CO2 emission resulting from the automobile industry.

1 Biofuel / light oil switching system 2 Light oil tank 2a Light oil 2b Remaining sensor 2c Float 2d Light oil refueling pipe 2e Light oil return pipe 3 Biofuel tank 3a Biofuel 3b Fuel meter sensor 3c Float 3d Biofuel refueling pipe 3e Biofuel return pipe 4 Mixed oil tank 4a Mixed oil 4b Alarm sensor 4c Float 4d Oil discharge valve 4e Mixed oil feed pipe 5 Engine 5a Filter 5b Fuel injection pump 6 Fuel supply pipe 7 Fuel return pipe 8 Fuel switching valve 8a Switching lever 8b Shaft 8c Lid 8d Cup 8e Rotating body 8f O-ring 8g Passage 8h Outlet 8i Hole 8k Connection pipe 8m Pipe 9 Fuel return valve 9c Lid 9d Cup 9e Rotating body 9f O-ring 9g Passage 9h Outlet 9i Hole 9k Connection pipe 9m Pipe 10 Fuel gauge changeover switch 10a Fuel gauge 10b Rotating body 10b Bypass terminal 10c Terminal 10d Lead wire 10f Lead wire 10 Ring 11 Indicator changeover switch 11a Battery (-)
11b Rotating body 11c Bypass terminal 11d Terminal 11d Lead wire 11f Lead wire 11g Ring 12 Indicator 12a Mixed oil full tank display 12b Biofuel in-use display 12c Biofuel to light oil switching display 12d Light oil to biofuel switching display 12e Light oil in-use display

In order to solve the above problems, the present invention provides a light oil tank that stores light oil, a biofuel tank that stores biofuel, a mixed oil tank that stores mixed oil in which light oil and biofuel are mixed, and a light oil supply pipe Connected to the light oil tank via a biofuel refueling pipe, connected to the biofuel tank via a fuel refueling pipe provided with a combustion filter and a fuel injection pump, and supplied to the engine A fuel switching valve for switching to either light oil or biofuel, a fuel return pump connected to the fuel injection pump, a light oil return pipe connected to the light oil fuel tank, and a biofuel return pipe Connected to a biofuel tank and connected to the mixed oil tank via a mixed oil feed pipe, and the return direction of fuel from the fuel injection pump A fuel return valve for switching to either a fuel tank or a mixed oil tank, and a biofuel / light oil switching system for a vehicle equipped with a diesel engine, wherein (1) when the fuel supplied to the engine is biofuel, the fuel The switching valve communicates the biofuel refueling pipe and the fuel refueling pipe, the fuel return valve communicates the biofuel return pipe and the fuel return pipe, and (2) when the fuel supplied to the engine is light oil, the fuel The switching valve connects the light oil supply pipe and the fuel supply pipe, the fuel return valve connects the light oil return pipe and the fuel return pipe, and (3) when switching from biofuel to light oil, the fuel switching valve is A light oil refueling pipe and a fuel refueling pipe communicate with each other, the fuel return valve communicates with the mixed oil tank liquid feeding pipe and a fuel return pipe for a certain period of time, and (4) when switching from light oil to biofuel, the fuel switching valve is Serial communicated biofuel feeding pipe and the fuel oil supply pipe, the fuel Modoben was construction of biofuel and diesel switching system characterized by communicating a certain time the oil mixture tank liquid feed pipe and the fuel return pipe.

1 is a schematic diagram of a biofuel / light oil switching system for a vehicle equipped with a diesel engine according to the present invention. FIG. It is a schematic diagram which shows the flow of the fuel at the time of biofuel use, and the electrical connection of a meter. It is a schematic diagram which shows the fuel flow and electrical connection of a meter when switching from biofuel to light oil. It is a schematic diagram which shows the flow of the fuel at the time of light oil service use, and the electrical connection of a meter. It is a schematic diagram which shows the fuel flow and electrical connection of a meter when switching from light oil to biofuel. It is explanatory drawing (longitudinal section) of a fuel switching valve and a fuel return valve. It is a schematic diagram which shows the position of each fuel valve interlocked with the movement of a switching lever, and the state of electrical connection of an indicator (when using biofuel). It is a schematic diagram which shows the position of each fuel valve interlocked with the movement of the switching lever and the state of electrical connection of the indicator (when switching from biofuel to light oil). It is a schematic diagram which shows the position of each fuel valve interlocked with the movement of a switching lever, and the state of electrical connection of an indicator (when using light oil). It is a schematic diagram which shows the position of each fuel valve interlocked with the movement of a switching lever, and the state of electrical connection of an indicator (at the time of switching from light oil to biofuel).

Next, the fuel switching flow from the start of the engine will be described. The driver of the diesel engine vehicle equipped with the biofuel / light oil switching system according to the present invention turns the cell with the key (IG ON) and starts the engine 5 (engine start).

The remaining amount of the biofuel 3a is determined. If the biofuel exists, the operation is started, and the remaining amount of the biofuel 3a is determined periodically during the operation.

In the determination of the remaining amount of biofuel 3a, if it is determined that there is no biofuel 3a, it is next determined whether or not there is a fueling facility for biofuel 3a. If there is a biofuel refueling facility, the biofuel 3a is refueled and the normal operation is resumed.

Claims (6)

A light oil tank for storing light oil, a biofuel tank for storing biofuel, a mixed oil tank for storing mixed oil mixed with light oil and biofuel, and a biofuel refueling system connected to the light oil tank via a light oil supply pipe A fuel connected to the biofuel tank via a pipe and connected to the engine via a fuel refueling pipe provided with a combustion filter and a fuel injection pump, and the fuel supply to the engine is switched to either light oil or biofuel A switching valve and a fuel return pump connected to the fuel injection pump; a light oil return pipe connected to the light oil fuel tank; a biofuel return pipe connected to the biofuel tank; and a mixed oil feed pipe And the fuel return direction from the fuel injection pump is switched to either the light oil tank, the biofuel tank or the mixed oil tank. A fuel Modoben changing, a biofuel and diesel switching system of a diesel engine equipped vehicle having,
(1) When the fuel supplied to the engine is biofuel, the fuel switching valve communicates the biofuel refueling pipe and the fuel refueling pipe, and the fuel return valve communicates the biofuel return pipe and the fuel return pipe. ,
(2) When the fuel supplied to the engine is light oil, the fuel switching valve connects the light oil supply pipe and the fuel supply pipe, and the fuel return valve connects the light oil return pipe and the fuel return pipe,
(3) When switching from biofuel to light oil, the fuel switching valve communicates the light oil supply pipe and the fuel supply pipe, and the fuel return valve communicates the mixed oil tank liquid supply pipe and the fuel return pipe for a certain period of time. ,
(4) When switching from light oil to biofuel, the fuel switching valve communicates the biofuel refueling pipe and the fuel refueling pipe, and the fuel return valve communicates the mixed oil tank feed pipe and fuel return pipe for a certain period of time. A biofuel / light oil switching system characterized in that The fuel switching valve has a bottomed and internal cavity with a first cup having seven holes in a side wall; a first rotor provided with a passage fitted into the cavity and having two outlets therein; and A first lid fixed to the opening surface side of one cup, a shaft for rotating the first rotating body, and a switching lever connected to the shaft on the first lid side for rotating the shaft,
The fuel supply pipe, the light oil supply pipe, and the biofuel supply pipe are connected to the separate holes, and the rotating body is rotated to communicate the passage, the fuel supply pipe, the light oil supply pipe, or the biofuel supply pipe. The fuel / light oil switching system according to claim 1, wherein the fuel to be fed to the fuel supply pipe is selected from light oil or biofuel. The fuel return valve is provided with a second cup having a bottom and an inner cavity and having seven holes on the side wall, and a passage having two outlets in the cavity and fitted therein. A second rotating body rotated by a lever, and a second lid fixed to the opening surface side of the second cup,
The fuel return pipe, the light oil return pipe, the biofuel return pipe, and the mixed oil feed pipe are connected to the separate holes, and the passage, the fuel return pipe, and the light oil return pipe are rotated by rotating the second rotating body. Alternatively, the biofuel return pipe or the mixed oil feeding pipe is communicated, and the fuel returned from the fuel injection pump is switched to the light oil tank, the biofuel tank, or the mixed oil tank. The biofuel / light oil switching system according to 2. The driver seat indicator which displays that it is the situation of said (1)-(4), or the said mixed fuel is full is provided, The any one of Claims 1-3 characterized by the above-mentioned. The biofuel / light oil switching system described. The biofuel / light oil switching system according to any one of claims 1 to 4, further comprising a fuel gauge that displays a remaining amount of the light oil fuel tank and the biofuel tank. The biofuel / light oil according to any one of claims 1 to 5, wherein the display of the driver's seat indicator is connected and controlled by a rotary switch in conjunction with the operation of the fuel switching valve. Switching system.

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