Engine with improved exhaust gas sensing
First Claim
1. A two-stroke internal combustion engine comprising an engine block, a combustion chamber defined in said engine block and adapted to have a piston reciprocate therein along an axis between a top dead center position and a bottom dead center position, and to have air and fuel combusted therein, thereby causing production of an exhaust gas and at least partially causing the piston to reciprocate, an exhaust port in said engine block and communicating with said combustion chamber and adapted to conduct the exhaust gas away from said combustion chamber, means defining a sensor chamber, a passage extending from said sensor chamber to said combustion chamber at a location axially between said exhaust port and the top dead center position, valve means operable in said passage between an open position for allowing flow of exhaust gas from said combustion chamber to said sensor chamber and a closed position for substantially preventing flow of non-combusted air and fuel from said combustion chamber to said sensor chamber, an exit conduit adapted to conduct at least a portion of the exhaust gas in said sensor chamber away from said sensor chamber, and means at least partially located in said sensor chamber for sensing a condition in the exhaust gas.
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Accused Products
Abstract
A two-stroke internal combustion engine is provided including an engine block, a combustion chamber defined in the engine block and adapted to have a piston reciprocate therein along an axis between a top dead center position and a bottom dead center position, and to have air and fuel combusted therein, thereby causing production of an exhaust gas and at least partially causing the piston to reciprocate, the internal combustion engine further comprising an exhaust port communicating with the combustion chamber and adapted to conduct the exhaust gas away from the combustion chamber, a sensor chamber at least partially defined in the engine block, a passage extending from the sensor chamber to the combustion chamber at a location axially between the exhaust port and the top dead center position, valve structure, operable in the passage for allowing flow of exhaust gas from the combustion chamber to the sensor chamber, and for preventing flow of non-combusted air and fuel from the combustion chamber to the sensor chamber, an exit conduit adapted to conduct at least a portion of the exhaust gas in the sensor chamber away from the sensor chamber, and structure at least partially located in the sensor chamber for sensing a condition in the exhaust gas.
33 Citations
21 Claims
- 1. A two-stroke internal combustion engine comprising an engine block, a combustion chamber defined in said engine block and adapted to have a piston reciprocate therein along an axis between a top dead center position and a bottom dead center position, and to have air and fuel combusted therein, thereby causing production of an exhaust gas and at least partially causing the piston to reciprocate, an exhaust port in said engine block and communicating with said combustion chamber and adapted to conduct the exhaust gas away from said combustion chamber, means defining a sensor chamber, a passage extending from said sensor chamber to said combustion chamber at a location axially between said exhaust port and the top dead center position, valve means operable in said passage between an open position for allowing flow of exhaust gas from said combustion chamber to said sensor chamber and a closed position for substantially preventing flow of non-combusted air and fuel from said combustion chamber to said sensor chamber, an exit conduit adapted to conduct at least a portion of the exhaust gas in said sensor chamber away from said sensor chamber, and means at least partially located in said sensor chamber for sensing a condition in the exhaust gas.
- 16. A two-stroke internal combustion engine comprising an engine block, a first combustion chamber defined in said engine block and adapted to have a first piston reciprocate therein along a first axis between a top dead center position and a bottom dead center position in said first combustion chamber and to have air and fuel combusted therein thereby causing production of an exhaust gas and at least partially causing the first piston to reciprocate, a second combustion chamber defined in said engine block and adapted to have a second piston reciprocate therein along a second axis between a top dead center position and a bottom dead center position in said second combustion chamber, and to have air and fuel combusted therein, thereby causing production of an exhaust gas and at least partially causing the second piston to reciprocate, a first exhaust port in said engine block and communicating with said first combustion chamber and adapted to conduct the exhaust gas away from said first combustion chamber, a second exhaust port in said engine block and communicating with said second combustion chamber and adapted to conduct the exhaust gas away from said second combustion chamber, means defining a sensor chamber, a first passage extending from said sensor chamber to said first combustion chamber at a location between, with respect to the first axis, said first exhaust port and the top dead center position in said first combustion chamber, a second passage extending from said sensor chamber to said second combustion chamber at a location between, with respect to the second axis, said second exhaust port and the top dead center position in said second combustion chamber, an exit conduit adapted to conduct at least a portion of the exhaust gas in said sensor chamber away from said sensor chamber, a first valve means operable in said first passage between a first open position for allowing flow of exhaust gas from said first combustion chamber to said sensor chamber and a first closed position for substantially preventing flow of non-combusted air and fuel from said first combustion chamber to said sensor chamber, a second valve means operable in said second passage between a second open position for allowing flow of exhaust gas from said second combustion chamber to said sensor chamber and a second closed position for substantially preventing flow of non-combusted air and fuel from said second combustion chamber to said sensor chamber, and means at least partially located in said sensor chamber for sensing a condition in the exhaust gas in said sensor chamber.
- 20. A two-stroke internal combustion engine comprising an engine block, a combustion chamber defined in said engine block and adapted to have air and fuel combusted therein, a piston adapted to reciprocate in said combustion chamber along an axis between a top dead center position and a bottom dead center position, an exhaust port in said engine block and communicating with said combustion chamber and adapted to conduct combusted air and fuel away from said combustion chamber, means defining a sensor chamber, a passage extending from said sensor chamber to said combustion chamber at a location axially between said top dead center position and said exhaust port and proximate said exhaust port, an exit conduit adapted to conduct combusted air and fuel from said sensor chamber, a disk valve operable in said passage between an open position and a closed position, said disk valve including a disk and a spring exerting a force on said disk, said disk being adapted to travel against the force of said spring to the open position to allow flow of combusted air and fuel from said combustion chamber to said sensor chamber when pressure in said combustion chamber exceeds a predetermined pressure, an oxygen sensor at least partially located in said sensor chamber, and means for supplying air and fuel to said combustion chamber in an adjustable ratio and for adjusting the air and fuel ratio.
Specification