Reactive agent i.e. ammonia, dosage device managing method for internal combustion engine of motor vehicle, involves setting pulse-duration modulation control signal of dosage valve with respect to speed of motor vehicle

摘要

#CMT# #/CMT# The method involves setting pulse-duration modulation control signal (s-DV) of a dosage valve (24) with respect to a speed (v) of a motor vehicle (10). Duration of a period of the control signal depending on the speed of the vehicle is extended in a continuous manner when the speed of the vehicle is reduced. The duration of the period of the control signal is limited to a maximum period duration depending on the vehicle speed. Pulse duration of the control signal depending on the vehicle speed is extended in a continuous manner when the vehicle speed is reduced. #CMT# : #/CMT# Independent claims are also included for the following: (1) a device for providing a reactive agent dosage device (2) a computer program comprising instructions to perform a method for managing a dosage device that doses a reactive agent in an exhaust gas channel of an internal combustion engine in a motor vehicle. #CMT#USE : #/CMT# Method for managing a dosage device that doses a reactive agent i.e. ammonia, in an exhaust gas channel of an internal combustion engine in a motor vehicle. #CMT#ADVANTAGE : #/CMT# The pulse-duration modulation control signal of the dosage valve is set with respect to the speed of the motor vehicle, thus minimizing audible noise from switching operation of the dosage valve with reduction of nitrogen oxide emission. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic side view of a motor vehicle in which a method for managing a dosage device that doses a reactive agent in an exhaust gas channel of an internal combustion engine, is implemented. s-DV : Pulse-duration modulation control signal v : Speed 10 : Motor vehicle 12 : Internal combustion engine 24 : Dosage valve.