Emulsion fuel engine
First Claim
Patent Images
1. An emulsion fuel engine having at least one cylinder with an injection nozzle for injecting an emulsion fuel, which has been formed by mixing a first fuel with a second fuel, into the cylinder, comprising:
- exhaust gas recirculation means for returning a portion of exhaust gas to an intake passage to recirculate the exhaust gas; and
exhaust gas recirculation control means for controlling the amount of the exhaust gas to be recirculated by the exhaust gas recirculation means.
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Accused Products
Abstract
Diesel fuel is stored in a first fuel tank, while water is stored in a second fuel tank. To use an emulsion fuel, diesel fuel and water are mixed and are caused to enter an injection pipe through a junction located between an injection pump and an injection nozzle. The emulsion fuel is injected through the injection nozzle. The engine is also equipped with exhaust gas recirculation devices to return a portion of the exhaust gas of the engine to an intake pipe of the engine so that some of the exhaust gas is recirculated.
52 Citations
16 Claims
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1. An emulsion fuel engine having at least one cylinder with an injection nozzle for injecting an emulsion fuel, which has been formed by mixing a first fuel with a second fuel, into the cylinder, comprising:
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exhaust gas recirculation means for returning a portion of exhaust gas to an intake passage to recirculate the exhaust gas; and exhaust gas recirculation control means for controlling the amount of the exhaust gas to be recirculated by the exhaust gas recirculation means. - View Dependent Claims (2, 3, 4)
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5. An emulsion fuel engine having at least one cylinder, comprising:
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a first fuel tank for storing a first fuel therein; a second fuel tank for storing a second fuel therein; an injection nozzle attached to the cylinder; an injection pump for drawing the first fuel from the first fuel tank and delivering under pressure the first fuel at a predetermined timing toward the injection nozzle; means for mixing the first fuel from the first fuel tank and the second fuel from the second fuel tank, whereby an emulsion fuel is formed; means for feeding the emulsion fuel, which has been delivered from said mixing means to an injection pipe at a location between the injection pump and the injection nozzle; exhaust gas recirculation means for returning a portion of exhaust gas to an intake passage to recirculate the exhaust gas; and exhaust gas recirculation control means for controlling the amount of the exhaust gas to be recirculated by said exhaust gas recirculation means. - View Dependent Claims (6, 7, 8)
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9. An emulsion fuel engine having at least one cylinder, comprising:
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a first fuel tank for storing a first fuel therein; a second fuel tank for storing a second fuel therein; an injection nozzle attached to the cylinder; an injection pump for drawing the first fuel from the first fuel tank and delivering under pressure the first fuel at a predetermined timing toward the injection nozzle; means for mixing the first fuel from the first fuel tank and the second fuel from the second fuel tank, whereby an emulsion fuel is formed; means for feeding the emulsion fuel, which has been delivered from said mixing means to an injection pipe at a location between the injection pump and the injection nozzle; exhaust gas recirculation means for returning a portion of exhaust gas to an intake passage to recirculate the exhaust gas; and exhaust gas recirculation control means for controlling the amount of the exhaust gas to be recirculated by said exhaust gas recirculation means; wherein said mixing means changes the mixing ratio of the first fuel to the second fuel in accordance with the engine load.
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10. An emulsion fuel engine having at least one cylinder, comprising:
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a first fuel tank for storing a first fuel therein; a second fuel tank for storing a second fuel therein; an injection nozzle attached to the cylinder; an injection pump for drawing the first fuel from the first fuel tank and delivering under pressure the first fuel at a predetermined timing toward the injection nozzle; means for mixing the first fuel from the first fuel tank and the second fuel from the second fuel tank, whereby an emulsion fuel is formed; means for feeding the emulsion fuel, which has been delivered from said mixing means to an injection pipe at a location between the injection pump and the injection nozzle; exhaust gas recirculation means for returning a portion of exhaust gas to an intake passage to recirculate the exhaust gas; and exhaust gas recirculation control means for controlling the amount of the exhaust gas to be recirculated by said exhaust gas recirculation means; wherein said mixing means comprises a three-way valve connected to both the first fuel tank and the second fuel tank so that the mixing ratio of the first fuel to the second fuel can be changed.
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11. An emulsion fuel engine having at least one cylinder, comprising:
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a first fuel tank for storing a first fuel therein; a second fuel tank for storing a second fuel therein; an injection nozzle attached to the cylinder; an injection pump for drawing the first fuel from the first fuel tank and delivering under pressure the first fuel at a predetermined timing toward the injection nozzle; means for mixing the first fuel from the first fuel tank and the second fuel from the second fuel tank, whereby an emulsion fuel is formed; means for feeding the emulsion fuel, which has been delivered from said mixing means to an injection pipe at a location between the injection pump and the injection nozzle; exhaust gas recirculation means for returning a portion of exhaust gas to an intake passage to recirculate the exhaust gas; and exhaust gas recirculation control means for controlling the amount of the exhaust gas to be recirculated by said exhaust gas recirculation means; wherein said exhaust gas recirculation means comprises an EGR valve interposed in an exhaust gas recirculation passage extending between an exhaust passage and the intake passage for adjusting the amount of the exhaust gas to be recirculated through the exhaust gas recirculation passage; whereby, when the engine load is high, the opening of the EGR valve is decreased and the proportion of the second fuel is increased; and
when the engine load is low, the opening of the EGR valve is increased and the proportion of the second fuel is decreased. - View Dependent Claims (12, 13)
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14. An emulsion fuel engine having at least one cylinder, comprising:
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a first fuel tank for storing a first fuel therein; a second fuel tank for storing a second fuel therein; an injection nozzle attached to the cylinder; an injection pump for drawing the first fuel from the first fuel tank and delivering under pressure the first fuel at a predetermined timing toward the injection nozzle; means for mixing the first fuel from the first fuel tank and the second fuel from the second fuel tank, whereby an emulsion fuel is formed; means for feeding the emulsion fuel, which has been delivered from said mixing means to an injection pipe at a location between the injection pump and the injection nozzle; exhaust gas recirculation means for returning a portion of exhaust gas to an intake passage to recirculate the exhaust gas; exhaust gas recirculation control means for controlling the amount of the exhaust gas to be recirculated by said exhaust gas recirculation means; and a constant pressure valve having the mechanism of a bidirectional check valve disposed at a discharge port of the injection pump, said discharge port being on a side of the injection pipe.
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15. An emulsion fuel engine having at least one cylinder, comprising:
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a first fuel tank for storing a first fuel therein; a second fuel tank for storing a second fuel therein; an injection nozzle attached to the cylinder; an injection pump for drawing the first fuel from the first fuel tank and delivering under pressure the first fuel at a predetermined timing toward the injection nozzle; means for mixing the first fuel from the first fuel tank and the second fuel from the second fuel tank, whereby an emulsion fuel is formed; means for feeding the emulsion fuel, which has been delivered from said mixing means to an injection pipe at a location between the injection pump and the injection nozzle; exhaust gas recirculation means for returning a portion of exhaust gas to an intake passage to recirculate the exhaust gas; and exhaust gas recirculation control means for controlling the amount of the exhaust gas to be recirculated by said exhaust gas recirculation means; and an emulsion fuel tank for storing the emulsion fuel from said mixing means disposed between said mixing means and said emulsion fuel feeding means.
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16. An emulsion fuel engine having at least one cylinder, comprising:
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a first fuel tank for storing a first fuel therein; a second fuel tank for storing a second fuel therein; an injection nozzle attached to the cylinder; an injection pump for drawing the first fuel from the first fuel tank and delivering under pressure the first fuel at a predetermined timing toward the injection nozzle; means for mixing the first fuel from the first fuel tank and the second fuel from the second fuel tank, whereby an emulsion fuel is formed; means for feeding the emulsion fuel, which has been delivered from said mixing means to an injection pipe at a location between the injection pump and the injection nozzle; exhaust gas recirculation means for returning a portion of exhaust gas to an intake passage to recirculate the exhaust gas; and exhaust gas recirculation control means for controlling the amount of the exhaust gas to be recirculated by said exhaust gas recirculation means; wherein sad emulsion fuel feeding means is provided with a check valve so that the emulsion fuel is allowed to penetrate into the injection pipe when the pressure of the emulsion fuel has become higher than the pressure of the fuel within the injection pipe.
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Specification