VEHICLE EXHAUST TREATMENT SYSTEMS

摘要

A vehicle engine exhaust gas treatment system (10) for use on a tractor comprising storage means (11) for storing urea, injector means (13) for injecting urea into a catalytic converter (21) located in an exhaust (22) of an engine (23), an air duct (29;30) via which air is drawn into the engine, and cooling means for cooling the urea on its passage from the storage means to the injector means, the cooling means comprising a heat exchanger which includes an inner pipe (15; 17) through which the urea flows on its way to the injector means, the inner pipe extending within the air duct (29;30) to cool the urea.