New Bosch diesel technology provides solution to NOx problem

ShinerBock wrote:

Lynnmor wrote:
And the parts are already on the shelf and nobody knew how to use them? Maybe somebody is blowing more smoke than the diesel.

I think there is a little confusion on what they mean by existing parts. They don't mean that you can just apply this to any current diesel out on the road using its parts. They mean that you can use current technology and parts that diesel already use and altering them for a different purpose along with remapping of engine controls.

They would probably take something like a variable geometry turbocharger that diesels are already using and change things such as compressor/turbine blades diameters, turbo horn A/R ratio, and actuator mapping to optimize the turbos efficiency map to work in conjunction with a high/low pressure EGR system to keep the exhaust gas temps hot enough for NOx conversion in the SCR at any load.

You see, one of the problems with the SCR is that it only works to remove NOx when it is hot enough and under low load it is not hot enough. This is when the EGR's on current trucks take over by cooling cylinder temps which is known to cause more soot which is why modern diesels do not do well with city driving. However, if you utilize the EGR to keep the exhaust temps hot enough for the SCR to do its job rather than as a means to cool in cylinder temps, then you can reduce emissions at any load level while also creating less soot. Basically they found a way to use existing parts in different ways and for different purposes.