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Diesel 101
The interest in the new generation of diesels in the US is exciting, especially as BMW makes some of the best.
As other markets have had diesels for years there seems to be a lack of understanding as to the complex exhaust after treatment system required now - not only in the US, but ECE and others as well.
The US market with its strict emission requirements started with Selective Catalyst Reduction (SCR) of NOx along with an OxiCAT/DPF, EGR and now with the N47T/N57T incorporates a NSC/DPF and particulate sensor along with EGR, and SCR.
I'd like to start this thread for members to post a few questions that may help invoke a bit of grey matter - but at the same time understand these newer systems better.
Question 1 - fairly basic.
What are all the reasons an controlled throttle valve with feedback is used in the new BMW diesels - DPF regeneration - engine overspeed protection and what else?
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