Delphi Technologies IP Limited

Simon R Panteny

Martin A P Sykes

Philip Turobin-Harrington

Martin AP Sykes

In a selective catalytic reductant dosing system including a reductant injector adapted to inject liquid reductant into an exhaust line, a method of analyzing flow of reductant through the injector includes determining a measure of the temperature of the injector prior to activation of the injector. The method also includes activating the injector and determining a measure of the temperature of the injector subsequent to activation of the injector. The method also includes analyzing the flow of reductant through the injector consequential to the activation by analyzing changes in the measure of temperature of the injector prior to activation and the measure of temperature of the injector subsequent to activation.

Method of determining operation of an SCR reductant doser

A method is provided for purging a selective catalytic reduction dosing system having a urea reservoir and a urea delivery module including at least one pump and a dosing injector arranged to spray urea into an engine exhaust pipe and a feedline. The method includes: (1) activating a reverse pump or a pump in a reverse direction; (2) opening the dosing injector; (3) stopping the reverse pump or reverse direction of the pump and closing the dosing injector; (4) activating a forward pump or a forward direction of the pump; (5) stopping the forward pump or forward direction of the pump and opening the dosing injector; and activating the reverse pump or reverse direction of the pump.

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Rochester, United Kingdom

Simon R Panteny