SUPERCHARGER FAILURE DIAGNOSIS DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a supercharger failure diagnosis device for an internal combustion engine for improving the accuracy of diagnosing a failure of one of primary and secondary side superchargers independently of the passage construction of primary and secondary side intake air passages.

SOLUTION: Primary and secondary side air flow meters 55, 56 are provided in primary and secondary side branch intake passages for measuring an intake air amount on the primary and secondary sides. An intake air amount difference computing part 58 of an electronic control device 57 computes an intake air amount difference in accordance with these measured values. When a computed value for the intake air amount difference is determined to be greater than a single side abnormality determined value preset for a recording medium by a determination computing part 59, an abnormality detection signal is output from a failure information part 60 and an accelerator opening is automatically set to be small. The intake air amount difference is computed instead of a pressure difference between the primary and secondary side intake air passages, thus improving the accuracy of detecting a failure of a supercharger independently of the passage construction of the intake air passages.

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