Method for a plausibility check of the output signal of a...

Details Method for a plausibility check of the output signal of a... Method for a plausibility check of the output signal of a...

2008-06-27

2010-10-12

McCall, Eric S (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Fuel system or part thereof

C071S064120

Reexamination Certificate

active

07810386

ABSTRACT:
A method for checking the output signal of a rail pressure sensor of a direct-injecting internal combustion engine having a common rail system for plausibility, including the following steps:the output signal of the rail pressure sensor is detected over a predefinable period of time and recorded;the output signal is transformed into the frequency space;characteristic features are extracted from the transformed signal;a rail pressure value is calculated on the basis of the features and additional, predefined influencing variables;an average rail pressure value is simultaneously ascertained from the output signal of the rail pressure sensor;the average rail pressure value is compared with the calculated rail pressure value;in the event that the calculated rail pressure value deviates from the average rail pressure value by a predefined limiting value, an error signal is output and/or stored in an error memory.

REFERENCES:
patent: 6901791 (2005-06-01), Frenz et al.
patent: 7370519 (2008-05-01), Delp et al.
patent: 2006/0130569 (2006-06-01), Walther et al.
patent: 2006/0144131 (2006-07-01), Schulz et al.
patent: 2006/0150723 (2006-07-01), Delp et al.
patent: 2009/0178474 (2009-07-01), Bailey
patent: 2009/0205413 (2009-08-01), Yamauchi et al.

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