초록 ▼

An exhaust restriction device for an internal combustion engine is disclosed. The exhaust restriction device includes a main valve and a bypass valve for restricting the flow of exhaust gas. The main valve is located in a main passage and may be selectively closed. The bypass valve is located in a b

An exhaust restriction device for an internal combustion engine is disclosed. The exhaust restriction device includes a main valve and a bypass valve for restricting the flow of exhaust gas. The main valve is located in a main passage and may be selectively closed. The bypass valve is located in a bypass passage and is biased into a position closing a port connecting the main passage and the bypass passage. Closing the main valve may cause exhaust back pressure to build against the bypass valve and an actuator therefor until the biasing force is overcome. When the biasing force is surpassed by the exhaust back pressure, the bypass valve opens to relieve the back pressure. The bypass valve closes when back pressure falls below the biasing force. A method of operating the exhaust restriction device is also disclosed.

대표청구항 ▼

[ We claim:] [1.] An exhaust restriction device located downstream of an exhaust manifold in an internal combustion engine, comprising:a main housing having a main passage and a bypass passage therein;a main exhaust valve for selectively blocking the flow of exhaust gas through the main passage;an u

[ We claim:] [1.] An exhaust restriction device located downstream of an exhaust manifold in an internal combustion engine, comprising:a main housing having a main passage and a bypass passage therein;a main exhaust valve for selectively blocking the flow of exhaust gas through the main passage;an upstream port providing communication between the main passage and the bypass passage at a point upstream of the main exhaust valve;a downstream port providing communication between the main passage and the bypass passage at a point downstream of the main exhaust valve;a bypass valve stopper for selectively blocking the upstream port;means for biasing the bypass valve stopper to block the upstream port; andmeans for opening the bypass valve stopper responsive to exhaust gas pressure in the device at a location upstream of the main exhaust valve.