Data processing: measuring – calibrating – or testing – Measurement system – Performance or efficiency evaluation
Reexamination Certificate
2005-06-28
2005-06-28
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Performance or efficiency evaluation
C073S118040, C073S118040, C431S012000
Reexamination Certificate
active
06912480
ABSTRACT:
A method for determining the total mass flow through an engine (10) comprises measuring (32) the fuel flow to the engine (10) and measuring the concentration of carbon dioxide in the gases exhausted (22) from the engine (10). The concentration of carbon dioxide is measured by detecting the infrared radiation absorption spectrum of carbon dioxide using a laser (38) and a detector (46). The method comprises determining (48) the air to fuel ratio in the engine (10) from the fuel flow and the concentration of carbon dioxide. The method comprises determining (48) the air mass flow through the engine (10) from the air to fuel ratio and calculating (48) the total air and fuel mass flow through the engine (10) by adding the air mass flow through the engine (10) to the fuel mass flow to the engine (10).
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patent: 5599179 (1997-02-01), Lindner et al.
patent: 6364602 (2002-04-01), Andrew et al.
patent: 6522994 (2003-02-01), Lang
patent: 0 067 545 (1982-12-01), None
Barlow John
Cherry Stephen J.
Oliff & Berridg,e PLC
Rolls-Royce PLC
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