One of the keys to making modern diesel engines so powerful and low in emissions has been high pressure common rail fuel injection systems. Vince Piacenti is a senior manager for common rail fuel systems at Bosch. The supplier has put up some vids on YouTube that discuss diesel technology, and Piacenti describes some of the development tools his team uses. Creating injectors that can precisely meter fuel at nearly 30,000 psi and last for the life of the engine is no trivial matter.
In order to get the new exhaust after-treatment systems to work, the injection system has to be able to quickly adjust the fuel flow to manage the regeneration of the diesel particulate filter. The ability to execute up to seven fuel pulses per power cycle helps to spread the expansion pressure, and combustion temperature. This makes operation quieter and smoother while reducing NOx production. Check out the video of Vince's lab tour after the jump.
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