Method for internal combustion engine control using pressure ratios
First Claim
1. Method to operate an internal combustion engine, said engine comprising a multi-cylinder direct-injection engine operative lean of stoichiometry;
- each cylinder including a variable volume combustion chamber defined by a piston reciprocating therein between top-dead-center and bottom-dead-center points and a cylinder head;
the piston reciprocating in repetitive cycles each cycle comprising intake, compression, expansion, and exhaust strokes, the method comprising;
adapting a plurality of pressure sensing devices to monitor in-cylinder pressure during ongoing engine operation;
monitoring in-cylinder pressure and a corresponding engine crank position to periodically to determine instantaneous in-cylinder pressure states corresponding to the engine crank position during the compression and expansion strokes;
determining a plurality of pressure ratios based upon the instantaneous in-cylinder pressure states; and
,determining a combustion heat release based upon the plurality of pressure ratios.
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Abstract
The invention comprises a method to operate a direct-injection engine operative at various air/fuel ratios. The method comprises monitoring in-cylinder pressure, along with a corresponding engine crank position to periodically to determine instantaneous in-cylinder pressure states corresponding to the engine crank position during compression and expansion. Pressure ratios are determined based upon the instantaneous in-cylinder pressure states. A combustion heat release is determined based upon the pressure ratios. An aspect of the invention comprises extending the operation to diesel, diesel premixed and to HCCI engines.
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Citations
20 Claims
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1. Method to operate an internal combustion engine, said engine comprising a multi-cylinder direct-injection engine operative lean of stoichiometry;
- each cylinder including a variable volume combustion chamber defined by a piston reciprocating therein between top-dead-center and bottom-dead-center points and a cylinder head;
the piston reciprocating in repetitive cycles each cycle comprising intake, compression, expansion, and exhaust strokes, the method comprising;adapting a plurality of pressure sensing devices to monitor in-cylinder pressure during ongoing engine operation; monitoring in-cylinder pressure and a corresponding engine crank position to periodically to determine instantaneous in-cylinder pressure states corresponding to the engine crank position during the compression and expansion strokes; determining a plurality of pressure ratios based upon the instantaneous in-cylinder pressure states; and
,determining a combustion heat release based upon the plurality of pressure ratios. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- each cylinder including a variable volume combustion chamber defined by a piston reciprocating therein between top-dead-center and bottom-dead-center points and a cylinder head;
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9. Method to operate an engine, said engine comprising a 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;
- the piston reciprocating in repetitive cycles each cycle comprising intake, compression, expansion, and exhaust strokes, the method comprising;
operating the engine lean of stoichiometry; adapting a plurality of pressure sensing devices to monitor in-cylinder pressure and a corresponding engine crank position during ongoing operation; determining a plurality of instantaneous in-cylinder pressure states corresponding to the engine crank position during the compression and expansion strokes; determining a plurality of pressure ratios based upon the instantaneous in-cylinder pressure states; and
,determining a combustion heat release for each cycle for each cylinder based upon the plurality of pressure ratios. - View Dependent Claims (10, 11, 12, 13, 14, 15)
- the piston reciprocating in repetitive cycles each cycle comprising intake, compression, expansion, and exhaust strokes, the method comprising;
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16. Method to monitor engine operation, said engine comprising a 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;
- the piston reciprocating in repetitive cycles each cycle comprising intake, compression, expansion, and exhaust strokes, the method comprising;
adapting a pressure sensing device to monitor in-cylinder pressure corresponding to engine crank position during ongoing operation; determining instantaneous in-cylinder pressure states corresponding to the engine crank position during the compression and expansion strokes; determining a cylinder pressure ratio at an engine crank angle based upon the instantaneous in-cylinder pressure states; determining a combustion heat release based upon the pressure ratios; and, estimating a mass of fuel burned in the cylinder based upon the combustion heat release. - View Dependent Claims (17, 18, 19, 20)
- the piston reciprocating in repetitive cycles each cycle comprising intake, compression, expansion, and exhaust strokes, the method comprising;
Specification