Title:
温度センサの機能性を監視するための方法
Document Type and Number:
Japanese Patent JP2008524506
Kind Code:
A
Abstract:
In a method for monitoring the functionality of a temperature sensor that can deliver an electrical signal as a function of the measured temperature and is disposed, in particular, in the cooling water circuit of an internal combustion engine, the persistence of the temperature sensor in the high signal range is made possible by a method encompassing the following steps: Characterizing the sensor as possibly faulty if the sensor indicates, upon engine shutdown, at least a maximum value of the cooling fluid temperature; determining a first gradient of the cooling fluid temperature, measured by the possibly faulty sensor, up to a first point in time after engine shutdown, and characterizing the sensor as fault-free if the gradient exceeds a minimum value; determining a second gradient of the cooling fluid temperature, measured by the possibly faulty sensor, between the point in time and a point in time after engine shutdown, and characterizing the sensor as fault-free if the second gradient exceeds a minimum value; determining the cooling fluid temperature measured by the possibly faulty sensor at a point in time after engine shutdown, and characterizing the sensor as fault-free if the cooling fluid temperature falls below a maximum value.
Inventors:
Dirk Ferstner
Andreas Eckert
Siegfried Getz
Jörg Neumann
Andreas Eckert
Siegfried Getz
Jörg Neumann
Application Number:
JP2007547409A
Publication Date:
July 10, 2008
Filing Date:
October 24, 2005
Export Citation:
Assignee:
ROBERT BOSCH GMBH
International Classes:
F02D41/22; F02D45/00; G01K15/00
Attorney, Agent or Firm:
Toshio Yano
Einzel Felix-Reinhard
Reinhard Einsel
Einzel Felix-Reinhard
Reinhard Einsel