Patent ID: 6467269
Filing Date: 2002-10-22
Classification: F02B,F15B,Y02T

Abstract:
An internal combustion engine comprising:a combustion cylinder; an exhaust system in flow communication with said combustion cylinder, to receive exhaust gases from said combustion cylinder; a combustion air system connected in flow communication to said combustion cylinder, to supply air to said combustion cylinder for supporting combustion; and a turbocharger including a compressor having an inlet and having an outlet connected in flow communication to said combustion air system, a turbine having an inlet connected to receive a flow of exhaust gases from said combustion cylinder, and a wastegate valve for controlling the flow of exhaust gases to said turbine; said wastegate valve including: a valve housing; a valve diaphragm in said valve housing separating said valve housing into first and second valve compartments having a first valve compartment pressure and a second valve compartment pressure, one of said first and second valve compartment pressures being ambient pressure; a valve rod connected to said valve diaphragm; a spring operatively connected to exert a spring force against said valve rod, said spring having an installed spring length; and an adjustable spring seat adjustable in height, for varying the installed spring length of said spring in response to changes in the ambient pressure.