Motor vehicles – Power – With means for handling motor exhaust
Patent
1998-12-17
2000-12-05
Swann, J. J.
Motor vehicles
Power
With means for handling motor exhaust
180 683, B60K 1304
Patent
active
061553743
ABSTRACT:
A snowmobile is powered by an internal combustion engine. The engine has an exhaust timing control valve, a control unit and a generator. The control unit determines the positioning of the control valve as a function of engine speed. Additionally, the control unit initiates a control valve cleaning cycle when the engine speed first exceeds a first predetermined speed within a predetermined range of engine speeds. The first predetermined speed is desirably an engine speed at which the generator generates sufficient power to render the control unit operable. The control unit retracts the control valve when the engine speed exceeds the upper limit of the predetermined range. Thereafter, the control unit initiates another control valve cleaning cycle when the engine speed decreases below a second predetermined engine speed.
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Lum L.
Swann J. J.
Yamaha Hatsudoki Kabushiki Kaisha
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