Westport Power Inc. (Westport) and their consortium have developed and tested a High Pressure Direct Injection (HPDI) technology which allows for a fuel mixture composed of primarily natural gas to be used in high‐performance diesel engines. Natural gas is stored in the form of liquefied natural gas (LNG) in tender cars and converted to natural gas prior to combustion. HPDI is ideally suited to high horsepower (HHP) applications such as locomotive engines, the application of interest for this project. HPDI entails injecting natural gas at high pressure into the engine cylinder, along with a small amount of diesel fuel which is required to initiate the combustion reaction. In operation, a HPDI engine typically runs on 95% or greater natural gas, as opposed to the typically diesel‐fuelled HHP engines currently on the market.
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