Patent ID: 7877997
Filing Date: 2011-02-01
Classification: F02B,F02D,Y02T

Abstract:
1. A method for controlling turbocharger speed of a turbocharged internal combustion engine, the engine including a compressor section associated with an intake valve for intake air, a turbine section associated with an exhaust valve for engine exhaust, and a variable valve actuation mechanism configured to variably actuate at least one of the intake valve and the exhaust valve, the method comprising: sensing actuation of at least one of the intake valve and the exhaust valve by the variable valve actuation mechanism and generating a first signal in response thereto; detecting turbocharger speed and generating a second signal in response thereto; generating a control signal based on a predetermined relationship between the first signal and the second signal; and controlling actuation of a hydraulically operated wastegate valve based on the control signal.