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This invention describes a system for engines that use gaseous fuel. When the engine is commanded to shut down, the system ensures no gaseous fuel remains trapped in the supply lines. It achieves this by closing a main gaseous fuel valve and then briefly running the engine on a combination of the trapped gaseous fuel and liquid fuel, burning off the remaining gas safely and efficiently. This applies specifically to engines capable of combusting both gaseous and liquid fuels.
Why it matters: The increasing global push for lower emissions has accelerated the adoption of gaseous fuels like natural gas and hydrogen in engines, particularly for heavy-duty applications. This has amplified the need for robust safety and efficiency systems, making the safe purging of fuel lines more critical than in 2018.
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