Method and apparatus to determine magnitude of combustion chamber deposits
First Claim
1. Method for determining a parameter for combustion chamber deposits of 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, said piston operably connected to a rotating crankshaft, the method comprising:
- monitoring a combustion parameter;
determining a combustion chamber deposit parameter based upon the combustion parameter; and
wherein monitoring the combustion parameter comprises monitoring a combustion chamber surface temperature and a related engine crank angle.
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Accused Products
Abstract
A method to dynamically determine a parametric value for combustion chamber deposits (CCD), e.g. in a controlled auto-ignition engine, including in-situ evaluation of thickness of CCD, based on a sensor which monitors combustion in a homogeneous charge compression ignition engine. It includes a temperature sensor operative to monitor the combustion chamber, and a CCD parameter that is based upon a peak combustion temperature measured at a crank angle. A CCD parameter can also be determined utilizing an in-cylinder pressure monitor, wherein a combustion chamber deposit parameter is based upon crank angle location of a peak in-cylinder pressure parameter.
70 Citations
9 Claims
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1. Method for determining a parameter for combustion chamber deposits of 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, said piston operably connected to a rotating crankshaft, the method comprising:
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monitoring a combustion parameter; determining a combustion chamber deposit parameter based upon the combustion parameter; and wherein monitoring the combustion parameter comprises monitoring a combustion chamber surface temperature and a related engine crank angle. - View Dependent Claims (2)
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3. Method for determining a parameter for combustion chamber deposits of 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, said piston operably connected to a rotating crankshaft, the method comprising:
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monitoring a combustion parameter comprising monitoring a related engine crank angle, determining an in-cylinder combustion pressure parameter during each engine cycle, and determining the combustion pressure parameter based upon a peak in-cylinder pressure and the crank angle location of the peak in-cylinder pressure; and determining a combustion chamber deposit parameter based upon the combustion parameter. - View Dependent Claims (4, 5)
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6. 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, wherein determining a parametric measure of combustion chamber deposits comprises;
monitoring a combustion parameter anddetermining a parametric measure of combustion chamber deposits based upon said combustion parameter comprising determining magnitude of combustion chamber deposits based upon an engine crank angle at which a peak combustion chamber surface temperature occurs during an engine cycle. - View Dependent Claims (7, 8, 9)
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Specification