The main reason diesel development got skewed was because, although Europe is the king of diesel, decades ago they decided that CO2 was the Bogey-Man that would bring the end of the world (laughable but whatever). On the other hand, our guys studied what caused the smog in places like LA and found out that it was main NOx (which is effectively unburned fuel). So the Euro motors that were developed for their market don't fair well here because our tests are weighted for different particulates.
The problem with diesel vs gasoline is diesel leaves almost no CO2 after combustion but it's harder to control the burn of the mixture so it emits FAR higher NOx. Since they are not able to run catalytic converters, it makes cleaning that up much more difficult. That's what all the DEF BS is about even though modern diesel engines burn far cleaner thanks to better designs and more accurate on-board computers.
It's a tough issue because no one wants the 70s smog haze but there has to be a middle ground somewhere. Recently, all the "emissions" standards have been used to attempt to force EV uptake (which is failing miserably here atm).
One other externality of running the DPF / regen cycles is the fact that the particulate matter gets smaller, and actually can cause more respiratory distress as it traverses deeper into the lungs. Less NOx, more lung damage.
The main reason diesel development got skewed was because, although Europe is the king of diesel, decades ago they decided that CO2 was the Bogey-Man that would bring the end of the world (laughable but whatever). On the other hand, our guys studied what caused the smog in places like LA and found out that it was main NOx (which is effectively unburned fuel). So the Euro motors that were developed for their market don't fair well here because our tests are weighted for different particulates.
The problem with diesel vs gasoline is diesel leaves almost no CO2 after combustion but it's harder to control the burn of the mixture so it emits FAR higher NOx. Since they are not able to run catalytic converters, it makes cleaning that up much more difficult. That's what all the DEF BS is about even though modern diesel engines burn far cleaner thanks to better designs and more accurate on-board computers.
It's a tough issue because no one wants the 70s smog haze but there has to be a middle ground somewhere. Recently, all the "emissions" standards have been used to attempt to force EV uptake (which is failing miserably here atm).
One other externality of running the DPF / regen cycles is the fact that the particulate matter gets smaller, and actually can cause more respiratory distress as it traverses deeper into the lungs. Less NOx, more lung damage.