REDUCTANT DELIVERY UNIT FOR AUTOMOTIVE SELECTIVE CATALYTIC REDUCTION WITH OPTIMIZED FLUID HEATING

摘要

A reductant delivery unit reduces nitrogen oxide (NOx) emissions from a vehicle. The delivery unit includes a solenoid operated fluid injector having a fluid inlet and a fluid outlet. The inlet receives a source of reducing agent and the outlet communicates with an exhaust gas flow path of the vehicle so that the fluid injector controls injection of the reducing agent into the exhaust gas flow path. The fluid injector has an inlet tube for directing the reducing agent between the inlet and the outlet. A coil heater is integral with the fluid injector and is constructed and arranged, when energized, to inductively heat the inlet tube and thus at least a portion of the reducing agent so that an unheated volume, of the reducing agent in the inlet tube, which is adjacent to the fluid outlet, is less than about 100 mm³.