The need for operation with non-visible smoke has grown in recent years.
Local regulations and restrictions on smoke emission have been imposed in certain geographical areas. Alaska, which sets duties and fees for vessels sailing in the region during the summer season, is the most significant example at present. More and more similar measures can be expected in the future.
Solutions
Various equipment is availabe to improve part-load performance, such as by-pass, waste gate, and variable valve timing, depending on the engine type. The ultimate is the common rail fuel injection system available on latest generation engines. With the common rail fuel injection system, injection pressure is kept high and constant over the whole load range, enabling operation without visible smoke over the entire operation field.
