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.
19 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