Biofuel use diesel engine

Abstract

To provide a diesel engine that uses biofuel containing impurities and that enables reduction of frequencies of piping maintenance and filter replacement.SOLUTION: A biofuel use diesel engine includes a petroleum tank 1 and a bio-tank 2. Solenoid selector valves 5, 11 are provided in fuel supply piping 6 and return piping 10 of the diesel engine 9. Petroleum supply and biofuel supply are appropriately switched by controlling the solenoid selector valves 5, 11 so as to alternately replenish petroleum and biofuel.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to diesel engines that utilize biofuels. [Background technology]

[0002] As described in Patent Document 1, there is a diesel engine that uses biofuel and petroleum fuel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5035207 Summary of the Invention [Problem to be solved by the invention]

[0004] Biofuels are mixed with petroleum fuels and used as fuel for diesel engines, but because biofuels contain impurities, they accumulate in fuel supply pipes and filters, requiring pipe maintenance and frequent cleaning and replacement of filters.

[0005] An object of the present invention is to provide a diesel engine that uses biofuel containing impurities and that requires less frequent piping maintenance and filter replacement. [Means for solving the problem]

[0006] The above-mentioned object of the present invention is achieved by the following technical means.

[0007] The invention of claim 1 is a biofuel-using diesel engine characterized by having an oil tank 1 and a biotank 2, and providing electromagnetic switching valves 5, 11 in the fuel supply pipe 6 and return pipe 10 of the diesel engine 9, and controlling the electromagnetic switching valves 5, 11 to switch between oil supply and biofuel supply, thereby alternately replenishing oil and biofuel.

[0008] The invention of claim 2 is a biofuel-using diesel engine according to claim 1, characterized in that when the electromagnetic switching valves 5, 11 are switched to biofuel supply, the usage time is accumulated and the engine is switched to petroleum fuel use at a predetermined time, and the biofuel piping 4, 6, 13 is made of silicone resin pipes.

[0009] The invention of claim 3 is a biofuel-using diesel engine as described in claim 1, characterized in that the operating time is counted when biofuel is supplied, the operating time is reset after the fuel filter 7 is replaced, and the operating time alarm is terminated when the oil tank 1 is replenished with more than a predetermined amount of fuel.

[0010] The invention of claim 4 is a diesel engine characterized by having an exhaust turbine 26 driven by exhaust pressure, and sending air sent from a wind turbine 28 driven by the exhaust turbine 26 to an air filter for purification. [Effects of the Invention]

[0011] In the invention of claim 1, when biofuel is continuously supplied from the biotank 2 to the diesel engine 9, impurities accumulate in the piping. However, by switching the electromagnetic switching valves 5, 11 on the fuel supply piping 6 and the return piping 10 to switch the fuel used from biofuel to petroleum fuel, the impurities accumulated due to the use of biofuel are washed away with the petroleum fuel, allowing the diesel engine 9 to be used for a long period of time.

[0012] In the invention of claim 2, the use of biofuel is managed by the operating time so that the accumulation of impurities is not large during long-term operation, and the biofuel pipes 4, 6, and 13 are made of silicone resin pipes, thereby reducing the accumulation of impurities.

[0013] In the invention of claim 3, by switching to petroleum fuel while biofuel is being supplied, the operating time for using biofuel can be reset and the operating time of the diesel engine 9 can be extended, but if the oil tank 1 is filled with fuel and there is room for fuel, the operating time alarm becomes unnecessary.

[0014] In the invention of claim 4, the air filter is cleaned by blowing air using the wind turbine 28 driven by exhaust pressure, so that the air filter can be cleaned while working outdoors, enabling long-term operation. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a fuel supply circuit diagram of a diesel engine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a flowchart of automatic fuel supply control for a diesel engine according to an embodiment of the present invention. [Figure 3] FIG. 2 is a flowchart of automatic fuel supply control for a diesel engine according to an embodiment of the present invention. [Figure 4] FIG. 1 is a side view of a riding rice transplanter according to an embodiment of the present invention. [Figure 5] 1 is a schematic cross-sectional view of an air injection device that utilizes exhaust gas from a diesel engine according to an embodiment of the present invention. [Figure 6] 1 is a cross-sectional view of a variable intake box of a diesel engine according to an embodiment of the present invention when the engine is running. FIG. [Figure 7] 3 is a cross-sectional view of the variable intake box of the diesel engine according to the embodiment of the present invention when cleaning the air filter. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0017] Figure 1 is a fuel piping diagram for a diesel engine 9, which runs from an oil tank 1 through a first oil supply pipe 3 and is connected to the diesel engine 9 via a biofuel pipe 6, which is a common supply pipe for fuel supply, at an electromagnetic switching valve 5, with a fuel filter 7 and a fuel pump 8 installed along the way. Also, a biofuel tank 2 is connected to the first electromagnetic switching valve 5 through a biofuel pipe 4, which is the first biofuel supply pipe.

[0018] The return pipe from the diesel engine 9 connects return pipe 10, which is a common first return pipe, to oil return pipe 12, which connects to oil tank 1 via electromagnetic switching valve 11, and biofuel pipe 13, which is a bio return pipe connected to biotank 2. Electromagnetic switching valves 5 and 11 are automatically controlled to switch so that when oil is used, fuel flows from oil tank 1 to diesel engine 9 and returns to oil tank 1, and when biofuel is used, fuel flows from biotank 2 to diesel engine 9 and returns to biotank 2.

[0019] Oil tank 1 and biotank 2 are equipped with level gauges 1A and 2A, respectively.

[0020] 2 and 3 are flowcharts for the automatic switching of the solenoid switching valves 5 and 11. When biofuel is selected in step S1, biofuel use is selected in step S1, and the solenoid switching valve 5 is switched to the biofuel piping 4, which is the first biofuel supply pipe, in step S2, and counting the engine operating time begins in step S3. If the remaining amount in level gauge 2A is below a predetermined level in step S4, the process proceeds to step S5. If the remaining amount in level gauge 1A is above a predetermined level, the process proceeds to step S6. If the remaining amount is below a predetermined level, a request for biofuel replenishment is made in step S17. If biofuel is replenished in step S18 and the amount is above a predetermined level, the notification ends in step S19 and the process returns to before step S4. If the amount is below a predetermined level, the process returns to before step S17. If the remaining amount in level gauge 2A is below a predetermined level in step S5, the process proceeds to step S17.

[0021] If a supply fuel switch notification is received in step S6, the supply source of solenoid switching valve 5 is switched in step S7 and the process proceeds to step S8, and if no supply fuel switch notification is received, the process proceeds to step S17. In step S8, counting of the operating time begins, level gauge 1A is monitored in step S9, and if it is below a predetermined level, level gauge 2A is monitored in step S10, and if it is above the predetermined level, a supply fuel switch notification is sent in step S14, solenoid switching valve 5 is switched in step S15, and in step S16, counting of the operating time begins and the process returns to before step S4.

[0022] Figure 4 shows a riding rice transplanter equipped with a fertilizer supply device 22 and a seedling transplanting device 18 at the rear of a body 17 supported by left and right front wheels 15, 15 and left and right rear wheels 16, 16, and petroleum fuel and biofuel are automatically supplied alternately to a diesel engine 9 located at the rear of the body 17 from an oil tank 1 and a biotank 2 attached to the sides of the front and rear main frames at the front lower part of the body 17. A fuel filter 7 for a biofuel pipe 6, which is a common supply pipe for supplying fuel, is located on the rear axle 19, making it less susceptible to mud and easier to maintain.

[0023] A resin plate is attached to the inside of the rear axle 19 that supports the rear wheels 16, and a fertility measuring electrode plate 20 is attached to the groove of the resin plate to measure the fertility of the soil. Two semicircular fertility measuring electrode plates 20 that are long from front to back are attached to the rear end of the main frame of the machine body 17, and the connection part with the harness is placed above the underside of the main frame to prevent the cable from becoming submerged in water. If the fertility measuring electrode plates 20 do not intrude under the field surface, the amount of fertilizer applied may be controlled using separately provided field tillage depth data. The amount of fertilizer applied by the fertilizer supply device 22 is controlled based on the soil fertility measured by the fertility measuring electrode plates 20.

[0024] Figure 5 shows an air injection device that uses the exhaust gas from a diesel engine 9. An exhaust turbine 26 and a wind-generating turbine 28 are mounted on a pivot shaft 27 that is supported on an exhaust injection case 25. The exhaust pressure flowing through the exhaust passage 24 turns the exhaust turbine 26, which in turn turns the wind-generating turbine 28, sucking in outside air from an intake passage 29 and blowing out compressed air from an air passage 30. The compressed air from the air passage 30 is blown onto the air filter of the diesel engine 9 to clean it, making it possible to clean the air filter whenever necessary while working outdoors.

[0025] 6 and 7 show an intake variable box 35 provided on the intake side of the air filter, with a cleaning intake valve 32, a main valve 33, and a turbine-side valve 34 provided inside, and when the engine is running, the cleaning intake valve 32 is closed, the main valve 33 is open, and the turbine-side valve 34 is closed, as shown in Figure 6. When cleaning the air filter, the cleaning intake valve 32 is opened, the main valve 33 is closed, and the turbine-side valve 34 is open, as shown in Figure 7.

[0026] The cleaning intake valve 32, main valve 33, and turbine side valve 34 are automatically linked to open and close. If the hose connected to the cleaning intake valve 32 is made bellows and can be removed and used, it can be used to clean parts other than the air filter.

[0027] During normal engine startup, turning the key on returns the system to the state shown in Figure 6 when the engine is running. [Explanation of symbols]

[0028] 1. Oil Tank 2 Biotank 4 Biofuel piping 5. Solenoid controlled valve 6 Biofuel piping 7. Fuel filter 9. Diesel engine 11 Solenoid controlled switching valve 13 Biofuel piping 26 Exhaust turbine 28 Wind Turbines

Claims

1. This biofuel-using diesel engine is characterized by having an oil tank (1) and a biotank (2), providing electromagnetic switching valves (5, 11) in a fuel supply pipe (6) and a return pipe (10) of a diesel engine (9), and controlling the electromagnetic switching valves (5, 11) to switch between oil supply and biofuel supply, thereby alternately replenishing oil and biofuel.

2. 2. A biofuel-using diesel engine according to claim 1, characterized in that when the electromagnetic switching valve (5, 11) is switched to biofuel supply, the usage time is accumulated, and after a predetermined time, the engine is switched to petroleum fuel use, and the biofuel piping (4, 6, 13) is made of silicone resin pipe.

3. 2. The biofuel-using diesel engine according to claim 1, characterized in that the operating time is counted when the biofuel is supplied, the operating time is reset after the fuel filter (7) is replaced, and the operating time alarm is terminated when the oil tank (1) is replenished with more than a predetermined amount of fuel.

4. A diesel engine is provided with an exhaust turbine (26) driven by exhaust pressure, and the air sent from a wind turbine (28) driven by the exhaust turbine (26) is sent to an air filter for purification.

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