To more accurately execute the diagnosis of a turbocharger by considering the influences of an EGR valve in a system having the EGR valve arranged in parallel to the turbocharger.
Even when a deviation between the target turbocharging pressure and the actual turbocharging pressure of the turbocharger is greater than a reference value (a) (YES in S10), if the EGR valve is outside a predetermined normal range (YES in S20), the failure diagnosis (S40-S80) of the turbocharger is suppressed. By suppressing or eliminating the influences of an element resulting from the malfunction of the EGR valve, out of the deviation between the target turbocharging pressure and the actual turbocharging pressure of the turbocharger 2, the diagnosis of the turbocharger can be more accurately executed.
SAWADA YUTAKA
OBARA TAKESHI
| JP2002004872A | 2002-01-09 | |||
| JP2006125247A | 2006-05-18 | |||
| JP2006070789A | 2006-03-16 |
Kazuo Abe
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