Patent ID: 11879375
Assignee: PACCAR INC
Field: Environmental technology (Chemistry)
Classification: CPC F  Y | IPC F

Claim 4:
5. The method of claim 1 wherein the selective catalytic reduction system is an upstream selective catalytic reduction system, the diesel exhaust fluid injector is a first diesel exhaust fluid injector, and the method further comprises:
measuring a level of NOx gases in the exhaust gas flow downstream of a downstream selective catalytic reduction system; and
controlling a second diesel exhaust fluid injector downstream of the upstream selective catalytic reduction system and upstream of the downstream selective catalytic reduction system to inject diesel exhaust fluid into the exhaust gas flow downstream of the upstream selective catalytic reduction system and upstream of the downstream selective catalytic reduction system at an injection rate that is based on the measured level of NOx gases in the exhaust gas flow downstream of the downstream selective catalytic reduction system.