Patent ID: 7533657

Claim:
An open/close control device for an intake-exhaust communication circuit, wherein: the intake-exhaust communication circuit is equipped with: (i) a turbocharger having a compressor for sucking in and pressurizing fresh air to supply an internal combustion engine therewith and an exhaust turbine for driving the compressor; and (ii) a bypass line through which an outlet line of the compressor and an inlet line of the exhaust turbine communicate with each other such that part of intake air in the outlet line of the compressor is able to flow into exhaust air from the engine in the inlet line of the exhaust turbine to thereby reduce a supply air pressure of the exhaust turbine, and the open/close control device is equipped with: (i) an open-close valve provided in the bypass line; and (ii) a valve opening and closing controlling means for controlling the open-close valve in a closing direction when it is determined that a rotational speed of the internal combustion engine is equal to or higher than an intermediate rotational speed and that a fuel injection amount of the internal combustion engine is equal to or smaller than a fuel injection amount required for autonomous operation thereof.