Patent ID: 7647158
Filing Date: 2010-01-12
Classification: F02D,Y02T

Abstract:
1. An airflow control system for an internal combustion engine having an intake manifold and a plurality of movable valves disposed in the intake manifold, the system comprising: a microprocessor in operable communication with a drive device for manipulating a position of the plurality of movable valves; a storage medium encoded with machine readable computer program code for diagnosing the airflow control system, the storage medium including instructions for causing the microprocessor to implement a method comprising: determining if a valve of the plurality of valves is in a stable position; commanding the valve to move from a first position to a second position; determining a period of time for the valve to move from the first position to the second position; providing a first signal if the period of time is greater than or less than a predetermined period of time, the predetermined period of time corresponding to an amount of time necessary to move the valve from the first position to the second position under predetermined conditions, the predetermined period of time having a range defined by an upper limit and a lower limit; and providing a second signal if the period of time is within the range defined by the predetermined period of time.