Method and apparatus to operate a homogeneous charge compression-ignition engine
First Claim
1. Method for operating an internal combustion engine adapted to be operative in a controlled auto-ignition combustion mode, said engine comprising a spark-ignition, direct-injection, four-stroke, internal combustion engine including a variable volume combustion chamber defined by a piston reciprocating within a cylinder between top-dead-center and bottom-dead-center points and a cylinder head comprising an intake valve and an exhaust valve, the method comprising:
- determining a parametric measure of combustion chamber deposits; and
, controlling engine operation based upon the parametric measure of combustion chamber deposits.
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Accused Products
Abstract
A method and apparatus for controlling engine operation to compensate for effects of combustion chamber deposits (CCDs) on combustion in a controlled auto-ignition engine is presented. Control methodologies comprise operation of variable valve actuation, fuel injection, spark timing, and intake air and coolant temperature to dynamically compensate for the effect of CCDs. A sensitivity to core gas temperature and chamber wall thermal conditions is shown, which is correlatable to in-cylinder CCD formation. Intake charge or coolant temperature control can be used to compensate for CCD effects. An engine control scheme relies upon a parametric input that quantifies instantaneous CCD formation in the combustion chamber. The result is further applicable to control pre-ignition in a conventional spark-ignition engine.
58 Citations
30 Claims
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1. Method for operating an internal combustion engine adapted to be operative in a controlled auto-ignition combustion mode, said engine comprising a spark-ignition, direct-injection, four-stroke, internal combustion engine including a variable volume combustion chamber defined by a piston reciprocating within a cylinder between top-dead-center and bottom-dead-center points and a cylinder head comprising an intake valve and an exhaust valve, the method comprising:
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determining a parametric measure of combustion chamber deposits; and
,controlling engine operation based upon the parametric measure of combustion chamber deposits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15-27. -27. (canceled)
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28. Method for operating an internal combustion engine comprising a spark-ignition, four-stroke internal combustion engine including a variable volume combustion chamber defined by a piston reciprocating within a cylinder between top-dead-center and bottom-dead-center points a cylinder head comprising an intake valve and an exhaust valve and spark plug operably connected to an ignition module, the method comprising:
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determining a parametric measure of combustion chamber deposits; and
,controlling engine operation based upon the parametric measure of combustion chamber deposits. - View Dependent Claims (29)
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30. A method for operating a multi-cylinder direct-injection, four-stroke internal combustion engine capable of operating with a controlled auto-ignition process, comprising:
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determining a parametric measure of combustion chamber deposits; and
,controlling engine operation based upon the combustion chamber deposit parameter.
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Specification