Method of operating a dual fuel internal
First Claim
1. A method for operating a reciprocating internal combustion engine of the piston-in-cylinder type, characterized by the steps of:
- a) supplying a vaporized fuel/air mixture to a combustion chamber of the engine, said mixture including a high octane fuel;
b) injecting pilot fuel, in the form of a high cetane fuel, directly into the combustion chamber to cause ignition of said fuel/air mixture, said combustion chamber being directly in communication with the piston, said pilot fuel being injected in such conditions as to form multiple flame fronts between the high cetane fuel and said fuel/air mixture but without auto-ignition of said fuel/air mixture itself;
wherein said high cetane fuel has a cetane value of at least 100 and wherein the amount of said high cetane fuel is less than 10% of the fuel requirements of the engine.
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Accused Products
Abstract
The combustion chamber of a high speed, two stroke or four stroke, internal combustion engine is provided with a generally homogeneous mixture of combustion air and two types of fuel, one having a high resistance to ignition (high octane), the other having a low resistance to ignition (high cetane), the fuels being supplied in a ratio which optimizes combustion for varying operating conditions. A high cetane fuel may also be injected into the combustion chamber to initiate the combustion in the form of rapidly propagating, multiple flame fronts. Moderate combustion pressures, rates of combustion pressure rise and low levels of combustion knock are generated. High compression pressures and little or no combustion air throttling are employed allowing high levels of thermal efficiency, fuel efficiency, output power and low levels of exhaust emissions. Low cost engine applications employ slightly lower compression pressures and an electrical spark to initiate combustion.
79 Citations
9 Claims
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1. A method for operating a reciprocating internal combustion engine of the piston-in-cylinder type, characterized by the steps of:
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a) supplying a vaporized fuel/air mixture to a combustion chamber of the engine, said mixture including a high octane fuel;
b) injecting pilot fuel, in the form of a high cetane fuel, directly into the combustion chamber to cause ignition of said fuel/air mixture, said combustion chamber being directly in communication with the piston, said pilot fuel being injected in such conditions as to form multiple flame fronts between the high cetane fuel and said fuel/air mixture but without auto-ignition of said fuel/air mixture itself;
wherein said high cetane fuel has a cetane value of at least 100 and wherein the amount of said high cetane fuel is less than 10% of the fuel requirements of the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification