초록 ▼

A supercharged internal combustion engine has a turbo supercharger mounted on an exhaust pipe so that a turbine of the supercharger is driven by engine exhaust gases to drive a blower for the compression of engine intake air. A bypass exhaust pipe is connected to the exhaust pipe at a point upstream

A supercharged internal combustion engine has a turbo supercharger mounted on an exhaust pipe so that a turbine of the supercharger is driven by engine exhaust gases to drive a blower for the compression of engine intake air. A bypass exhaust pipe is connected to the exhaust pipe at a point upstream of the supercharger and extends in bypassing relationship to the supercharger. A valve is provided in the exhaust system at the above-mentioned point to control the exhaust gas flow into and through the exhaust pipe and the bypass exhaust pipe, respectively. A valve actuator is responsive to variation in the intake pressure in the engine intake system downstream of a throttle valve to actuate the valve such that, when the intake pressure is not greater than a first predetermined value, the valve is actuated to fully close the exhaust pipe and, when the intake pressure becomes greater than a second predetermined value, the valve is actuated to fully close the bypass pipe, whereby the supercharger is operated only in a throttle full-open engine operating range and the supercharging air pressure is kept below a predetermined pressure level to prevent not only the supercharger but also the engine intake and exhaust systems from being continuously subjected to loads.

대표청구항 ▼

A supercharged internal combustion engine comprising: an intake system including an intake duct for feeding air into engine cylinders; a throttle valve pivotally mounted in said intake duct to control the rate of air flow therethrough; an exhaust system for discharging engine exhaust gases into the

A supercharged internal combustion engine comprising: an intake system including an intake duct for feeding air into engine cylinders; a throttle valve pivotally mounted in said intake duct to control the rate of air flow therethrough; an exhaust system for discharging engine exhaust gases into the atmosphere; said exhaust system including an exhaust pipe; a supercharger mounted on said exhaust pipe and driven by the flow of the engine exhaust gases therethrough to produce and feed pressurized air into the engine cylinders; said exhaust system further including a bypass exhaust pipe bypassing said supercharger and having an upstream end connected to said exhaust pipe at a point upstream of said supercharger; means disposed in said exhaust system adjacent to said point and being operative to open and close said exhaust pipe and said bypass exhaust pipe for thereby controlling the flow of engine exhaust gases into sand through said exhaust pipe and said bypass exhaust pipe; and control means operatively associated with said exhaust gas flow controlling means and being responsive to variation in the intake pressure in said intake system downstream of said throttle valve to actuate said exhaust gas flow controlling means; said control means being operative such that, when the intake pressure is not greater than a first predetermined value, said exhaust gas flow controlling means is actuated to fully close said exhaust pipe and, when said intake pressure becomes greater than a second predetermined value, said exhaust gas flow controlling means is actuated to fully close said bypass exhaust pipe.