Method and apparatus for determining TDC for each cylinder...

Details Method and apparatus for determining TDC for each cylinder... Method and apparatus for determining TDC for each cylinder...

2007-04-05

2008-12-30

McCall, Eric S (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Relative rotational position

C073S114160

Reexamination Certificate

active

07469576

ABSTRACT:
True Top Dead Center (TDC) of an engine piston is determined through determination of the Location of Peak Pressure (LPP) using either of two simplified algorithms. A Heat Loss Offset (HLO), drawn from a look-up table based on engine speed, molar mass of the air being compressed, and heat loss rate to the cylinder walls, is added to the calculated LPP to provide a corrected and true TDC position for each piston, which corrects for errors in target wheel tooth location of a camshaft position sensor and for any misalignment in the target wheel during installation on an engine. Preferably, such a calculation is carried out for each cylinder of a multi-cylinder engine during operation thereof, thus further correcting for machining errors in the crankshaft and for crankshaft bending during the life of the engine. The invention thus allows for more accurate combustion calculations for each individual cylinder.

REFERENCES:
patent: 6367317 (2002-04-01), Jaye
patent: 6564623 (2003-05-01), Zanetti
patent: 7117080 (2006-10-01), Sobel
patent: 2001/0006004 (2001-07-01), Zanetti
patent: 2004/0236496 (2004-11-01), Sobel
Nilsson, Ylva and Eriksson, Lars; “Determining TDC Position Using Symmetry and Other Methods”; SAE International, 2004 SAE World Congress, Detroit, Michigan, Mar. 8-11, 2004; SAE Technical Paper Series #2004-01-1458.

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