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Title:
FAIL SAFE DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP2003041995
Kind Code:
A
Abstract:

To realize a positive and proper fail safe in an internal combustion engine controlling a suction air quantity by using an variable valve mechanism changing opening and closing characteristics of an intake valve.

Various sensors are diagnosed for anomalies (level 1 diagnosis), and engine power control and constant vehicular speed travel control are diagnosed for operational anomalies (level 2 diagnosis). When an anomaly is determined in the level 1 and 2 diagnoses, a process of limiting engine power by limiting a lift amount and cutting fuel is demanded as a level 1 fail safe process. A CPU of a control unit is diagnosed (level 3 diagnosis), and an ultimate level 2 fail safe process of selecting a fail safe demand from many on the basis of the level 1-3 diagnoses is carried out. In the level 2 fail safe process, a process of stopping the engine is carried out in an anomaly of the CPU, and a limp home operation is carried out in, for example, an undetectable state of the opening and closing characteristics.


Inventors:
MACHIDA KENICHI
WATANABE SATORU
Application Number:
JP2001000226723
Publication Date:
February 13, 2003
Filing Date:
July 26, 2001
Export Citation:
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Assignee:
HITACHI UNISIA AUTOMOTIVE LTD
International Classes:
B60K31/00; F01L13/00; F02D13/02; F02D29/02; F02D41/18; F02D41/22; F02D45/00; (IPC1-7): F02D41/22; B60K31/00; F01L13/00; F02D13/02; F02D29/02; F02D41/18; F02D45/00
Attorney, Agent or Firm:
Fumio Sasashima