Method for operating a direct-injection spark-assisted compression-ignition engine
First Claim
1. A method for operating a compression-ignition internal combustion engine comprising a plurality of combustion chambers operating in a four-stroke combustion cycle and configured to operate at a geometric compression ratio greater than 10:
- 1, the method comprising;
operating the engine in a spark-assisted compression-ignition combustion mode for all speed/load engine operating points, comprising;
forming a fuel/air charge by injecting a first quantity of fuel into each combustion chamber during a compression stroke, said injecting being completed prior to any combustion within the combustion chamber;
operating the engine to manage temperature of the fuel/air charge in the combustion chamber below an auto-ignition point of the fuel/air charge; and
providing a spark discharge in the combustion chamber subsequent to injecting the first quantity of fuel and in advance of the fuel/air charge achieving an auto-ignition temperature.
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Accused Products
Abstract
A compression-ignition internal combustion engine includes a plurality of combustion chambers operating in a four-stroke combustion cycle and is configured to operate at a geometric compression ratio greater than 10:1. A method for operating a the engine includes forming a fuel/air charge by injecting fuel into each combustion chamber during a compression stroke, wherein the injection is completed prior to any combustion within the combustion chamber. The method further includes operating the engine to manage temperature of the fuel/air charge in the combustion chamber below an auto-ignition point of the fuel/air charge, and providing a spark discharge in the combustion chamber subsequent to injecting the fuel and in advance of the fuel/air charge achieving an auto-ignition temperature.
30 Citations
16 Claims
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1. A method for operating a compression-ignition internal combustion engine comprising a plurality of combustion chambers operating in a four-stroke combustion cycle and configured to operate at a geometric compression ratio greater than 10:
- 1, the method comprising;
operating the engine in a spark-assisted compression-ignition combustion mode for all speed/load engine operating points, comprising; forming a fuel/air charge by injecting a first quantity of fuel into each combustion chamber during a compression stroke, said injecting being completed prior to any combustion within the combustion chamber; operating the engine to manage temperature of the fuel/air charge in the combustion chamber below an auto-ignition point of the fuel/air charge; and providing a spark discharge in the combustion chamber subsequent to injecting the first quantity of fuel and in advance of the fuel/air charge achieving an auto-ignition temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- 1, the method comprising;
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14. A method for operating a compression-ignition internal combustion engine comprising a plurality of combustion chambers operating in a four-stroke combustion cycle and configured to operate at a geometric compression ratio greater than 10:
- 1, the method comprising;
operating the engine in a spark-assisted compression-ignition combustion mode for all speed/load engine operating points, comprising; injecting a fuel pulse into each combustion chamber early enough in the compression stroke to premix the fuel pulse with intake air to establish a premixed fuel/air charge; controlling phasing of a variable cam phasing system configured to control opening and closing of an intake valve to establish an effective compression ratio between about 10;
1 and 6;
1 whereby temperature of the premixed fuel/air charge remains below an auto-ignition point of the fuel/air charge; andproviding a spark discharge in the combustion chamber subsequent to injecting the fuel pulse to ignite a portion of the premixed fuel/air charge sufficient to increase the premixed fuel/air charge temperature to the auto-ignition point. - View Dependent Claims (15, 16)
- 1, the method comprising;
Specification