Exhaust system for internal combustion engine
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United States of America Patent
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-
Nov 24, 1987
Grant Date -
N/A
app pub date -
Oct 9, 1985
filing date -
Oct 10, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A part of an exhaust system 1 for an internal combustion engine has a valve 2 which can be moved by means such as a vacuum actuator 3 from a fully open inoperative position to an operative position in which it restricts the exhaust passageway by a variable amount. In the operative position, resilient means such as a coil spring 8 urges the valve to close the exhaust passageway against the pressure of exhaust gases, thereby increasing the backpressure on the engine in a controlled way. This is done on start-up to reduce the warm-up time of the engine and to reduce hydrocarbon emissions. When the engine has warmed up, the actuator 3 moves the valve to its inoperative position.
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