SCR on gasoline lean burn engine?

[mechman600]

Originally Posted by cRiPpLe_rOoStEr

This, and the subsequently frequent regen cycles for both the NOx trap and the DPF end up killing some of the MPG advantage from a Diesel engine

Not to mention the periodic SOX regens (ultra super duper hot) to get the stuck-on diesel sulfur out of the NOx sponge.

[cRiPpLe_rOoStEr]

Originally Posted by mechman600

All HD diesels are limited to 5 mph in the most severe SCR driver inducement mode. The most severe driver inducement mode occurs after 20 hours after the DEF pump loses prime OR if the DEF pump loses prime and the operator cycles the keyswitch, so there is plenty of time to get more DEF. 5 mph is basically enough to get off the road and call a tow truck. All it requires for repair is to fill the DEF tank and the fault codes to be cleared. Basically, the EPA really really want the operators to keep DEF tanks from going empty.

Back here in hell.. err.. Brazil it takes 48 hours after the SCR tank goes empty, then the power and torque are automatically cut by 40%, requiring the truck to get the fault codes cleared even after the SCR tank is filled.