DEVICE FOR DETERMINING FAILURE OF CYLINDER PRESSURE SENSOR

Title:

DEVICE FOR DETERMINING FAILURE OF CYLINDER PRESSURE SENSOR

Document Type and Number:

Japanese Patent JP2009108868

Kind Code:

A

Abstract:

To more precisely detect the failure of a cylinder pressure sensor without causing cost increase.

A device for determining the failure of the cylinder pressure sensor calculates cylinder pressure of an internal combustion engine based on the cylinder pressure sensor provided on the internal combustion engine, and calculates drift parameter indicating quantity of drift of the cylinder pressure based on the cylinder pressure. It is determined that the cylinder pressure sensor fails if the drift parameter is not in a predetermined range. In an embodiment, the predetermined range can be set based on behavior of cylinder pressure. In other embodiment, correction coefficient is determined according to an operation state of the internal combustion engine, and the drift parameter is corrected with the correction coefficient. In other embodiment, the cylinder pressure sensor is operated to superpose a predetermined investigation signal on output of the cylinder pressure sensor. Cylinder pressure is calculated based on output of the cylinder pressure sensor having the investigation signal superposed thereon.

Inventors:

SATO MASAHIRO
OKUBO KATSURA
SHINOZAKI KOICHIRO
YASUI YUJI
NAGASHIMA KEIICHI

Application Number:

JP2009009244A

Publication Date:

May 21, 2009

Filing Date:

January 19, 2009

Export Citation:

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