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Title:
DIAGNOSIS DEVICE
Document Type and Number:
WIPO Patent Application WO/2015/016303
Kind Code:
A1
Abstract:
Provided is a diagnosis device which effectively diagnoses coolers without providing a temperature sensor upstream of the coolers. A diagnosis device for coolers (16, 22) for cooling fluid flowing through the intake and exhaust systems (11, 12) of an engine (10) comprises: downstream temperature sensors (34, 37) for detecting fluid temperature downstream of the coolers; fluid temperature calculation units (42, 52, 53) for calculating fluid temperature upstream of the coolers on the basis of a fluid state quantity; sensor output value calculation units (44, 54) which assume upstream temperature sensors detecting fluid temperature upstream of the coolers, reflect a delay in sensor response in the calculated fluid temperature, and calculate estimated sensor output values from the upstream temperature sensors; and cooler diagnosis units (45, 55) for diagnosing the cooling efficiency of the coolers on the basis of actual sensor input values inputted from the downstream temperature sensors (34, 37) and on the basis of the calculated estimated sensor output values.

Inventors:
HANAWA Satoshi (Fujisawa factory 8, Tsuchidana, Fujisawa-sh, Kanagawa 81, 〒2520881, JP)
UCHIYAMA Tadashi (Fujisawa factory 8, Tsuchidana, Fujisawa-sh, Kanagawa 81, 〒2520881, JP)
FUJIE Hidekazu (Fujisawa factory 8, Tsuchidana, Fujisawa-sh, Kanagawa 81, 〒2520881, JP)
MURASAWA Naoto (Fujisawa factory 8, Tsuchidana, Fujisawa-sh, Kanagawa 81, 〒2520881, JP)
Application Number:
JP2014/070196
Publication Date:
February 05, 2015
Filing Date:
July 31, 2014
Export Citation:
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Assignee:
ISUZU MOTORS LIMITED (26-1, Minami-Ohi 6-chome Shinagawa-k, Tokyo 22, 〒1408722, JP)
International Classes:
F02B29/04; F02M25/07
Foreign References:
JP2009114871A2009-05-28
JP2008106633A2008-05-08
JP2000303895A2000-10-31
JP2013108416A2013-06-06
JP2013108416A2013-06-06
JP2013108414A2013-06-06
Other References:
See also references of EP 3029295A4
Attorney, Agent or Firm:
KINUTANI Nobuo (Chemical Building, 15-12 Nishi-Shimbashi 3-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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