Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports
Patent
1998-01-27
2000-07-25
McMahon, Marguerite
Internal-combustion engines
Two-cycle
Whirl through piston-controlled ports
123 73C, F02B 300, F02B 3304
Patent
active
060924942
ABSTRACT:
A two-cycle internal combustion engine implements low-pressure, cylinder wall fuel injection and uses a notched exhaust port or the like to control cylinder pressure rise during exhaust port closure. An electronic control unit controls the operation of fuel injection through the cylinder wall. Fuel injection terminates before the piston closes the exhaust port as the piston travels from bottom dead center to top dead center. The exhaust port notch tempers pressure gradients and pressure fluctuations in the piston cavity that can otherwise occur before the exhaust port closes and can be detrimental to the control of low-pressure fuel injectors. The exhaust port notch allows better fuel injection control, especially at idle or low speeds, without requiring the port positions and configurations to be modified which could compromise engine performance at medium or high speeds.
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Brunswick Corporation
McMahon Marguerite
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