F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
F02M 21/02 (2006.01) F02D 19/02 (2006.01) F02M 51/06 (2006.01)
Patent
CA 2505455
Known gaseous-fuelled engines introduce a gaseous fuel with the intake air charge and do not inject the gaseous fuel directly into the combustion chamber. Because of the different conditions under which a gaseous fuel is directly injected, compared to a liquid fuel, the amount of gaseous fuel that is injected can be more sensitive to the injection pulsewidth. In addition, because a gaseous fuel is a compressible fluid, compared to incompressible fluids like liquid fuels, it is more difficult to vary injection pressure for a gaseous fuel that is injected directly into the combustion chamber. An engine operating method is provided for directly injecting a gaseous fuel into a combustion chamber during a compression stroke, commanding gaseous fuel injection pressure to a target value that is determined as a function of at least one pre-selected engine parameter, measuring actual gaseous fuel injection pressure and adjusting fuel injection pulsewidth to correct for differences between the target value and the actual gaseous fuel injection pressure to thereby inject the desired mass quantity of gaseous fuel as determined from an engine map. A disclosed direct injection gaseous-fuelled engine system comprises a fuel delivery subsystem, a fuel injection valve, and a controller that cooperate with each other to introduce a gaseous fuel into a combustion chamber where it can be combusted. The fuel delivery subsystem comprises a device for controlling gaseous fuel injection pressure. The controller is operative to determine a value for at least one preselected engine parameter from engine operating conditions, and from that, a target injection pressure. If the injection pressure is different from the target injection pressure, the controller can command the device for controlling gaseous fuel injection pressure to increase or decrease gaseous fuel pressure to the target injection pressure. The controller also commands opening and closing of the fuel injection valve to adjust fuel injection pulsewidth to correct for differences between measured gaseous fuel injection pressure and the target injection pressure.
Ancimer Richard
Batenburg Greg
Thompson Jeff
Gowling Lafleur Henderson Llp
Westport Power Inc.
Westport Research Inc.
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