Title:
DEVICE AND METHOD FOR DETECTING ABNORMALITY OF EXHAUST GAS TEMPERATURE OF ENGINE WITH SUPERCHARGER
Document Type and Number:
Japanese Patent JPH1144220
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a device and a method for detecting abnormality of the exhaust gas temperature of an engine with a supercharger to improve detection precision of an exhaust gas temperature and reliably, rapidly, and high-efficiently detect blow-by of a valve and abnormality of a supercharger or an injection amount. SOLUTION: This device comprises an output torque line to the rotation speed and a fuel injection amount of an engine; a boost pressure line to the rotation speed and a fuel injection amount of an engine; and a memory means to store a given section consisting of the output torque line approximately equal to a rated output point of output torque and a boost pressure line. The output of the engine is determined from a rotation speed from an engine rotation speed sensor 31 and an injection amount of fuel from a fuel injection amount sensor 32. Only when this output is within a given section, a current measured exhaust gas temperature 33 is corrected to a rotation speed at a rated output point and an exhaust gas temperature during injection of fuel, which are compared with a threshold. When this corrected exhaust gas temperature exceeds the threshold, abnormality of and exhaust systems is detected.
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Inventors:
AKIYAMA SADACHIKA
Application Number:
JP21248597A
Publication Date:
February 16, 1999
Filing Date:
July 22, 1997
Export Citation:
Assignee:
KOMATSU MFG CO LTD
International Classes:
F02B39/16; F02D45/00; (IPC1-7): F02B39/16; F02D45/00
Attorney, Agent or Firm:
Yoshihiko Hashizume