Abstract:
The invention comprises a method for purging a selective catalytic reduction dosing system (10) having a urea reservoir (11), a urea delivery module (12) comprising at least one pump (23, 24, 33, 43), a dosing injector (15) arranged to spray urea into an engine exhaust pipe and a feedline (26, 36, 46). The method comprises: (1) activating a reverse pump (23)/ a pump in a reverse direction (33, 43); (2) opening the dosing injector (15); (3) stopping the reverse pump (23)/ reverse direction of the pump (33, 43) and closing the dosing injector (15); (4) activating a forward pump (24)/ a forward direction of the pump (33, 43); (5) stopping the forward pump (24)/ forward direction of the pump (33, 43) and opening the dosing injector (15); and (6) activating the reverse pump (23)/ reverse direction of the pump (33, 43). The invention also extends to a selective catalytic reduction dosing system (10).
Abstract:
The invention concerns a vehicular liquid storage system, the system comprising a tank and a liquid dispensing pump (2) having an inlet (1) and a bypass circuit outlet (4) arranged within said tank; the inlet (1) and the bypass circuit outlet (4) are arranged in such a way that, if a vertical liquid density gradient is present, liquid having a first density is taken in by the inlet and moved through the bypass circuit outlet (4) to a portion of the tank containing liquid having a second density, with the second density being lower than the first density.
Abstract:
The present exhaust treatment system comprises: - a first dosage device (371) arranged to supply a first additive into the exhaust stream; - a first reduction catalyst device (331), arranged downstream of said first dosage device for reduction of nitrogen oxides (NO x ) through the use of the additive; - a particulate filter (320) at least partly comprising a catalytically oxidising coating, which is arranged downstream of said first reduction catalyst device (331); - a second dosage device (372) arranged downstream of said particulate filter (320) and arranged to supply a second additive into said exhaust stream; - a second reduction catalyst device (332), arranged downstream of said second dosage device (372), and arranged for reduction of nitrogen oxides in said exhaust stream through the use of least one of said first and said second additive.
Abstract:
According to one embodiment, a diesel exhaust fluid purging system includes a metering valve with a supply port and a delivery port. The purging system also includes a pump assembly that is fluidly connected to the supply port of the metering valve. The pump assembly includes a pump and a single supply line that is fluidly connectable with a diesel exhaust fluid source. The purging system further includes an injection assembly that is fluidly connected to the delivery port of the metering valve. The injection assembly includes an air supply line that is fluidly connectable with an air supply source. Additionally, the purging system includes a controller in electrical communication with the metering valve, the pump assembly, and the injection assembly. The controller is configured to purge the pump assembly of residual diesel exhaust fluid using air from the air supply line.
Abstract:
Die Erfindung betrifft ein Verfahren zum Betreiben einer Vorrichtung (1) zur Bereitstellung eines flüssigen Additivs, aufweisend zumindest eine Ansaugstelle (17) zur Entnahme von flüssigem Additiv aus einem Tank (2), eine ventilfreie Förderleitung (6), die von der Ansaugstelle (17) zu einer Bereitstellungseinheit (3) verläuft und eine ventilfreie Verdrängerpumpe (4), wobei die Verdrängerpumpe (4) dazu eingerichtet ist, das flüssige Additiv von dem Tank (2) über die Ansaugstelle (17) entlang der Förderleitung (6) zu der Bereitstellungeinheit (3) zu fördern und wobei die Verdrängerpumpe (4) mindestens eine Abdichtung (19) der Förderleitung (6) hat, die zur Förderung des flüssigen Additivs entlang der Förderleitung (6) verschoben werden kann. Bei dem Verfahren wird in Schritt a) ein Betriebsstop der Vorrichtung (1) festgestellt; in Schritt b) wird eine Position (45) der Abdichtung (19) innerhalb der Verdrängerpumpe (4) festgestellt und in Schritt c) wird die Position (45) der Abdichtung (19) verändert, wenn die Position (45) der Abdichtung nicht einer vorgesehenen Parkposition (44) entspricht,.
Abstract:
内燃機関において、機関排気通路内に排気浄化触媒(15)と炭化水素供給弁(15)が配置されており、炭化水素供給弁(15)から予め定められた周期でもって炭化水素を噴射することによって排気ガス中に含まれるNO x が浄化される。炭化水素供給弁(15)からは炭化水素が機関排気通路の上流側に向けて噴射され、炭化水素供給弁(15)から予め定められた周期でもって炭化水素が噴射されるときには、炭化水素の噴射圧が各噴射の噴射期間中において噴射開始時から噴射終了時に向けて次第に低下せしめられる。
Abstract:
A control system for reducing nitrogen oxides in an engine exhaust of an engine includes an emissions catalyst having an inlet adapted to receive an exhaust from the engine. A reductant tank stores a reductant. An injector is in fluid communication with the reductant tank and is operable to inject the reductant into the exhaust upstream of the catalyst. A reductant pump pumps the reductant from the reductant tank to the injector. A controller determines a target pressure of the reductant based on an engine operating condition and operates the reductant pump based on the target pressure.