METHOD FOR DIAGNOSING STICKING IN CYLINDER DEACTIVATION APPARATUS

摘要

The present invention relates to a method for diagnosing sticking in a cylinder deactivation apparatus, the method comprising: an intake valve sticking determining step of determining whether the intake valve is stuck closed or stuck open by detecting the amount of variation of intake pressure in each intake manifold cylinders in an operation-off mode of the cylinder deactivation apparatus and comparing the amount of variation with a predetermined value; and an exhaust valve sticking determining step of determining whether the exhaust valve is stuck closed or stuck open by detecting the state of the air-fuel ratio in exhaust gas if it is determined whether the intake valve is stuck closed or stuck open in the intake valve sticking determining step, thereby sensing the stuck closed or the stuck open state of the intake valve and the exhaust valve so as to diagnose failure of the cylinder deactivation apparatus.

主权项

1. A method for diagnosing sticking in a cylinder deactivation apparatus sensing a stuck closed state or a stuck open state of an intake valve and an exhaust valve due to a failure of a cylinder deactivation apparatus, the method comprising:
an intake valve sticking determining step of determining whether the intake valve is stuck closed or stuck open by detecting the amount of variation of intake pressure in each intake manifold cylinders in an operation-off mode of the cylinder deactivation apparatus and comparing the amount of variation with a predetermined value; and an exhaust valve sticking determining step of determining whether the exhaust valve is stuck closed or stuck open by detecting a state of the air-fuel ratio in exhaust gas if it is determined whether the intake valve is stuck closed or stuck open in the intake valve sticking determining step.