Method for controlling operations of liquid medium feed pump of urea metering device to control operations of combustion engine of motor car, involves determining characteristics of feed pump using control device

摘要

The method involves monitoring dosing amount of liquid medium by comparing a working torque of a liquid medium feed pump with a predetermined torque, where the working torque of the feed pump is determined using a detectable pressure sensor. Characteristics of the feed pump are determined using a control device. Time gradient torque of the feed pump is determined (203), where the characteristics are selected from a group consisting of pump engine speed, winding temperature of the feed pump, electric current or power consumption of the pump. Independent claims are also included for the following: (1) a computer program comprising a set of instructions for controlling a liquid medium feed pump of an urea metering device of a vehicle (2) a computer program product comprising a set of instructions for controlling a liquid medium feed pump of an urea metering device of a vehicle.