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For high-efficiency diesel-cycle engines, Westport proprietary direct-injection fuel injectors for compressible (or gaseous) fuels are designed to be incorporated into these engines with minimal or no modifications to the cylinder head. No special pistons, cams, gas mixer or port injectors are needed.
Late-cycle, high-pressure direct injection ensures diffusion type combustion and therefore retains the high power, torque, and efficiency of a diesel engine.
Westport has developed injectors capable of handling the special challenges presented by compressible fuels, including:
Westport has two main types of Westport injectors:
WestportTM High-Pressure Direct Injection (HPDI) injectors provide a small diesel pilot spray and a larger gas spray. The diesel averages only about 5% of the total energy input and is used to start the main combustion of high-pressure directly-injected natural gas (methane). Westport HPDI injectors are common-rail, diesel actuated, and electronically controlled.
They can power engines up to about 24 bar BMEP at diesel-like efficiencies.
Compressed Natural Gas Direct Injection (CNG-DI) injectors use only gaseous fuels (usually natural gas or hydrogen). Ignition must be forced with either a hot surface or a spark. This need generally requires close collaboration with the engine OEM. CNG-DI injectors are common-rail and directly actuated, allowing almost unlimited injection flexibility for multiple injections and unparalleled control of injection rate for rate-shaping.