A reductant dosing system includes an injector, a fixed displacement pump in fluid communication with the injector, a reductant source in fluid communication with the fixed displacement pump, a pressure sensor assembly that detects a pressure of a reductant and stores a calibration value, and a controller communicatively coupled to the fixed displacement pump and the pressure sensor assembly. The controller receives data that includes the detected pressure of the reductant and the calibration value. The controller, in response to the calibration value being within a predetermined calibration value range, calculates a flow rate of the fixed displacement pump based on at least the detected pressure and the calibration value, and, in response to the calibration value being outside the predetermined calibration value range, calculates the flow rate of the fixed displacement pump based on at least the detected pressure and a pre-determined calibration value different from the calibration value.

A controller for a dosing module including a pump, an inlet manifold coupled to the pump, a nozzle, an outlet manifold coupled to the nozzle, a first branch coupled to the inlet manifold and the outlet manifold and having a first flow restrictor and a first valve, a second branch coupled to the inlet manifold and the outlet manifold and having a second flow restrictor and a second valve, and a sensor coupled to the inlet manifold and the outlet manifold, includes an input/output interface and a processing circuit. The input/output interface is configured to electronically communicate with the first valve and the second valve. The processing circuit configured to selectively cause the first valve to be in a first valve first position, in which the first valve facilitates fluid communication from the inlet manifold to the outlet manifold through the first branch, and a first valve second position.

A lance injector assembly for an exhaust component includes: an exhaust conduit; a shaft configured to extend into the exhaust conduit and dispense reductant from a hydraulically-actuated valve; an actuator configured to operate the hydraulically-actuated valve; and a mounting system configured to couple the actuator and the shaft to the exhaust conduit. The mounting system prevents the actuator from directly contacting the exhaust conduit.

An aftertreatment system comprises a reductant storage tank and a SCR system including a catalyst for reducing constituents of an exhaust gas. A reductant insertion assembly is fluidly coupled to the reductant storage tank and the SCR system. A controller is communicatively coupled to the reductant insertion assembly. The controller is configured to: determine an initial pressure of the reductant, determine a first pressure at which the reductant is to be delivered to the selective catalytic reduction system and adjust an operating parameter of the reductant insertion assembly. The adjustment of the operating parameter results in an at least selective delivery of the reductant at the first pressure to the SCR system.

A lance injector assembly for an exhaust component includes: a shaft configured to extend into an exhaust conduit of the exhaust component, the shaft being hollow so as to define a channel therethrough, wherein an opening is defined in a wall of the shaft proximate to a second end of the shaft that is opposite the first end; a cap coupled to a first end of the shaft; and a supply line disposed within the channel defined by the shaft, wherein a nozzle is disposed at a downstream end of the supply line, the nozzle being fluidly coupled to the shaft around the opening such that reductant is able to flow from the nozzle through the opening and into an exhaust gas flowing through the exhaust conduit. Air is present in the space between the supply line and the wall of the shaft, the air inhibiting heat transfer to the supply line.

Disclosed is a method for adapting control of a reducing agent dosing unit in a reducing agent provision system for emission control of a combustion engine. Characteristics relating to pressure variations associated with a dosing cycle are used for determining a first time period and a second time period. The time periods relate to a delay between activation of dosing and de-activation of dosing, respectively. The first time period and second time period are used for adapting operation of said reducing agent dosing unit.

A system for controlling reductant spray momentum for a target spray distribution includes an exhaust system having an exhaust conduit with exhaust flowing therethrough, a reductant injection system for injecting reductant into the exhaust flowing through the exhaust system based on one or more injection parameters, a reductant supply system for supplying reductant to the reductant injection system based on one or more supply parameters, and a controller. The controller is configured to access current vehicle, engine, exhaust, or reductant condition parameters, determine one or more control parameters based on a control model and the accessed current CZ vehicle, engine, exhaust, or reductant condition parameters, and modify a value of the one or more injection parameters or the one or more supply parameters to control the reductant spray.

Arrangement (100) for an exhaust gas aftertreatment system (102), comprising a tank (104) for storing a reducing agent (106); a pump unit arrangement (108) arranged in downstream fluid communication with the tank; a nozzle (110) arranged to inject a flow of reducing agent into the exhaust gas aftertreatment system (102), the nozzle being arranged in downstream fluid communication with the tank, via the pump unit arrangement, by means of a reducing agent conduit (112); an air conduit (114) arranged in fluid communication with the nozzle (110) for delivery of compressed air to the nozzle; and a return conduit (116) arranged in fluid communication between the reducing agent conduit and the tank, the return conduit comprising a return conduit valve arrangement (118), wherein the air conduit (114) is arranged in fluid communication with the reducing agent conduit (112) for controllably delivery of reducing agent to the tank via the return conduit valve arrangement (118) by means of providing compressed air from the air conduit to the reducing agent conduit.

Disclosed is a process for the dynamic monitoring of the flow rate of liquid additive consumed by a liquid-additive injector of an exhaust gas treatment system of a motor vehicle. The measurement of the pressure of the liquid makes it possible firstly to deduce the flow rate circulating through the orifice and secondly, by knowing the operating characteristic of the pump, to determine the flow rate of liquid additive actually delivered to the system for treating polluting gases. The process also provides a phase of characterizing the pump, including commanding the closure of the injector, measuring at least two pressure values for two different operating speeds of the pump, and updating the pump operating characteristics table on the basis of the pressure values measured.

Various embodiments include a method for monitoring a pressure sensor in a hydraulic system of a motor vehicle, the method comprising: actuating a valve of a pressure accumulator in the hydraulic system; detecting a behavior of the actuated valve in response to the actuation; determining a time offset of the actuated valve based on the detected behaviour; determining a measurement value of the pressure sensor; comparing the time offset of the valve with the determined measurement value; and checking a plausibility of the measurement value based on the comparison.