Patent ID: 6655141
Filing Date: 2003-12-02
Classification: F02B,F02D,Y02T

Abstract:
An airflow system for an internal combustion engine, the engine having an intake manifold and an exhaust manifold, the airflow system comprising:a first turbocharger including a first turbine coupled with a first compressor, the first turbine being configured to receive exhaust flow from the exhaust manifold, the first compressor being configured to supply compressed air to the intake manifold; a second turbocharger including a second turbine coupled with a second compressor, the second turbocharger being arranged in series with the first turbocharger; a wastegate valve fluidly coupled with the exhaust manifold, the wastegate valve being movable between a first position and second position, the first position allowing fluid flow exhausted by the engine to bypass at least one of the first turbine and the second turbine, the second position restricting fluid flow exhausted by the engine from bypassing the first turbine and the second turbine; and a controller configured to restrict supply of pressurized air to the wastegate valve such that the wastegate is in the second position at times when at least one of (i) a monitored load of the engine is less than or equal to a predetermined load for a monitored speed of the engine, (ii) a monitored speed of the engine is less than or equal to a predetermined speed for a monitored load of the engine, and (iii) a monitored temperature of compressed air leaving the first compressor is less than or equal to a predetermined temperature.