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    • 4. 发明公开
    • DUAL FUEL ENGINE
    • ZWEISTOFFMOTOR
    • EP1460250A1
    • 2004-09-22
    • EP01275100.4
    • 2001-12-25
    • Niigata Power Systems Co., Ltd.
    • GOTO, Satoru c/o Niigata Power System Co., Ltd.
    • F02D19/06
    • F02M17/22F02B3/06F02B19/10F02B19/108F02D13/0276F02D15/04F02D19/0628F02D19/0684F02D19/105F02F3/26Y02T10/12Y02T10/125Y02T10/18Y02T10/36
    • The present invention aims to allow an arbitrary selection to be made between gas operation and diesel operation, to achieve a reduction in NOx even when in diesel operation, to allow the compression ratio to be adjusted and altered in accordance with the operating state when in gas operation, to allow quick starting, and to perform operations at a high combustion efficiency over the entire load range. The dual fuel engine of the present invention is provided with a precombustion chamber unit, which is located in the cylinder head of the dual fuel engine, having a precombustion chamber and an electromagnetic fuel injection valve (a liquid fuel injection valve) and also with a compression ratio control valve. The compression ratio control valve opens and closes an air passage that connects the main combustion chamber with an intake port. In gas operation, the valve opening time of the compression ratio control valve is adjusted in accordance with the operating state, and the compression is adjusted by allowing a portion of the air gas mixture inside the main combustion chamber to escape to the intake port. Fuel gas is ignited by a pilot quantity of liquid fuel from the electromagnetic fuel injection valve and is then combusted. In diesel operation, the compression ratio control valve is closed and liquid fuel injected at a high compression ratio from the electromagnetic fuel injection valve is combusted by a precombustion method.
    • 本发明旨在允许在气体操作和柴油操作之间进行任意选择,即使在柴油操作中也能够实现NOx的减少,以允许根据气体中的操作状态来调节和改变压缩比 操作,允许快速启动,并且在整个负载范围内以高燃烧效率执行操作。 本发明的双燃料发动机设置有预燃室单元,其位于双燃料发动机的气缸盖中,具有预燃室和电磁燃料喷射阀(液体燃料喷射阀),并且还具有 压缩比控制阀。 压缩比控制阀打开和关闭连接主燃烧室与进气口的空气通道。 在气体运行中,压缩比控制阀的开阀时间根据运转状态进行调节,通过使主燃烧室内的一部分空气混合气体逸出到进气口来进行压缩。 燃料气体被来自电磁燃料喷射阀的先导量的液体燃料点燃,然后燃烧。 在柴油机操作中,压缩比控制阀关闭,并且以电磁燃料喷射阀以高压缩比喷射的液体燃料通过预燃方法燃烧。