Self tuning cylinder pressure based heat release computation

Details Self tuning cylinder pressure based heat release computation Self tuning cylinder pressure based heat release computation

2011-07-05

2011-07-05

Kwon, John T (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S435000

Reexamination Certificate

active

07974762

ABSTRACT:
A method for automatic, heat release computation in a piston engine, comprises the steps of: measuring a cylinder pressure as a function of crank angle (see FIGURE), based on said measurement; calculating a first polytropic exponent for a compression stroke (in M), based on said measurement, calculating a second polytropic exponent for an expansion stroke (in M′); for a crank angle interval between the compression stroke and the expansion stroke, performing an interpolation of the first and second polytropic exponents and performing a net heat release computation based on said interpolated polytropic exponent.

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Per Tunestal, J. Karl Hedrick and Rolf Johansson, Model-Based Estimation of Cylinder Pressure Sensor Offset using Least-Squares Methods, journal, Dec. 2001, pp. 3740-3745, Orlando, Florida.

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