Method pertaining to air removal from a liquid supply system and a liquid supply system

摘要

A method pertaining to a liquid supply system which supplies liquid to a feed device (230) via which liquid is supplied to at least one consumption point (250): Determining presence of air supplied upstream to the feed device (230), and, when presence of air is found, of reducing operating power of the feed device (230) compared with ordinary operation. Also a computer program product containing program code (P) for a computer (200; 210) for implementing the method. Also a device and a motor vehicle (100) which is equipped with the device.

主权项

1. A method of operating a liquid supply system of an SCR exhaust system comprising:
providing a container, an electric pump and a supply line to supply liquid from the container to the electric pump via the supply line, the pump supplying the liquid back to the container and to the exhaust system via a dosing unit that includes a dosing valve; operating the pump at a predetermined power level; detecting presence of air supplied upstream of the pump with a pressure sensor, and determining presence of air supplied upstream of the pump with a control unit; and operating the pump at a reduced power by reducing an operating power of the pump to a level below the predetermined level in response to detecting presence of air supplied upstream of the pump; and maintaining the reduced operating power of the pump while supplying liquid to the exhaust system and back to the container via the dosing unit until no longer the detected presence of air is present.