Exhaust restriction device
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United States of America Patent
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-
Aug 29, 2000
Grant Date -
N/A
app pub date -
Feb 17, 1999
filing date -
Feb 17, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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.
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