Method for ascertaining the gas work performed by the...

Details Method for ascertaining the gas work performed by the... Method for ascertaining the gas work performed by the...

2011-03-15

2011-03-15

Kwon, John T (Department: 3747)

Internal-combustion engines

Charge forming device

Including cylinder pressure or temperature responsive means

C123S673000, C701S114000, C073S114130

Reexamination Certificate

active

07905214

ABSTRACT:
To determine the gas work WKfrom the areas formed by the cylinder pressure curve over the associated stroke volume Vα, a cylinder-pressure-proportional integrator is started integrating the signals of the cylinder pressure sensor in multiple integrator runs depending on a settable integrator capacitance. A lower and an upper threshold value are predefined, whose difference corresponds to the integrator capacitance. Upon reaching one of the threshold values, respective new integrator runs are started, at the beginning and end of which the current crankshaft angle α (is detected, respectively. For each integrator run, the associated individual work is determined depending on the product of the integrator capacitance and the particular covered stroke volume and the gas work resulting from the cylinder pressure curve is determined by summation of the individual works. The gas work may be used in particular for determining the internal mean pressure of the cylinder.

REFERENCES:
patent: 4131097 (1978-12-01), Sawada et al.
patent: 5127262 (1992-07-01), Demizu et al.
patent: 5642713 (1997-07-01), Schmitz et al.
patent: 6388444 (2002-05-01), Hahn et al.
patent: 7489998 (2009-02-01), Bauer et al.
patent: 2008/0196488 (2008-08-01), Bauer et al.
patent: 4116518 (1991-05-01), None
patent: 10127913 (2001-06-01), None
patent: 102006030842 (2006-07-01), None

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