INTAKE DEVICE FOR ENGINE ASSOCIATED WITH SUPERCHARGER

PURPOSE:To improve the reliability in an intake device where a supercharger is arranged in the upstream of carburetor, by providing a controller for driving a pressure control valve such as an exhaust bypass valve upon abrupt deceleration thereby reducing excessive positive pressure for causing oil leakage of carburetor. CONSTITUTION:Upon departing of foot from an accelerator pedal 9 under abrupt deceleration, a microswitch 3a of pressurized carburetor 3 is turned on to changeover a three-way valve 6 thus to lead the output pressure of compressor 1a which is equal to that in a pressure receiving chamber 5b communicating to the downstream of compressor 1a of turbocharger 1 into the pressure receiving chamber 5a of actuator 5 through a path 6c. Consequently, a disphragm member 5c is moved to the right through a compression spring 5h thus to contact an actuator rod 5g against a diaphragm member 5d. Since the combined force of the output pressure of compressor 1a and the spring 5h force is applied onto said member 5d to the right, the opening of an exhaust bypass valve 7 will increase thus to lower the output pressure quickly.