Method for controlling an on-board vehicle emissions system

摘要

A method for controlling venting of an on-board vehicle emissions treatment substance storage and distribution system 10 is disclosed that selectively dispenses an emissions treatment substance 14 from a storage tank 12 on the vehicle to an exhaust system 30 of the vehicle. The method includes a step 208 of selectively coupling the storage tank 12 to the exhaust system 30 when pressure in the storage tank 12 exceeds a predetermined pressure associated with the exhaust system 30. The invention may also include a step 214 of selectively coupling the storage tank 12 to atmosphere when a pressure differential between the storage tank 12 and atmosphere exceeds a predetermined pressure differential.