Arrangement for controlling the intake air flow of a supercharged internal combustion engine

An arrangement for controlling the charging air flow of an internal combustion engine having an air intake manifold with an intake air pipe and an exhaust manifold and comprising a supercharger having a suction side and a discharge side, said intake air pipe extending from the discharge side of said supercharger to said engine for supplying combustion air thereto, a throttle valve disposed in said intake air pipe for controlling the supply of combustion air to said engine, a communication line extending from said intake air pipe upstream of said throttle valve to said engine exhaust manifold for supplying air to the engine exhaust gas, an air filter housing receiving ambient air and including a filter for filtering the ambient air entering said filter housing, an air supply pipe extending from said air filter housing to the suction side of said supercharger for supplying air from said filter housing to said supercharger, a return air duct extending from said intake air pipe upstream of said throttle valve to said air filter housing to permit a return flow of air from said air intake pipe to said air filter housing and an air flow control valve arranged in said return air duct, said air flow control valve including a servomotor operated by a controller for controlling the return air flow from said intake air pipe to said filter housing, said return air duct being in communication with said air supply pipe through said filter housing.