Exhaust timing control device for two-cycle engine
First Claim
1. An exhaust port system for an internal combustion engine comprising a main exhaust port for discharging combustion products from said engine, an auxiliary exhaust port for discharging combustion products from said engine, means for sequentially opening and closing said exhaust ports during a complete cycle of engine operation, an auxiliary exhaust port control means for selectively opening and closing an auxiliary exhaust passage communicating with said auxiliary exhaust port in response to an engine condition for selectively precluding combustion products from flowing through said auxiliary exhaust port even when said auxiliary port is open, and means for retarding the effective timing of the opening of said main exhaust port upon the operation of said auxiliary exhaust port control means for providing a smooth power curve.
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Accused Products
Abstract
An exhaust port controlling arrangement for an internal combustion engine having both main and auxiliary exhaust ports. A main control valve cooperates with the main exhaust port for varying the timing at which the exhaust port opens in response to engine speed. An on/off auxiliary control valve is positioned in a passage leading from the auxiliary exhaust port for opening and closing the flow through the auxiliary exhaust passage in response to an engine condition. Means retard the opening of the main exhaust port upon opening of the auxiliary exhaust ports to improve the power and torque curves of the engine.
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Citations
8 Claims
- 1. An exhaust port system for an internal combustion engine comprising a main exhaust port for discharging combustion products from said engine, an auxiliary exhaust port for discharging combustion products from said engine, means for sequentially opening and closing said exhaust ports during a complete cycle of engine operation, an auxiliary exhaust port control means for selectively opening and closing an auxiliary exhaust passage communicating with said auxiliary exhaust port in response to an engine condition for selectively precluding combustion products from flowing through said auxiliary exhaust port even when said auxiliary port is open, and means for retarding the effective timing of the opening of said main exhaust port upon the operation of said auxiliary exhaust port control means for providing a smooth power curve.
Specification