Method for diagnosing dosing system, which meters reagent into exhaust passage of internal combustion engine, involves bringing reagent by pump to operating pressure, where metering takes place with dosing valve

摘要

The method involves bringing a reagent (12) by a pump (14) to an operating pressure (pB). The metering takes place with a dosing valve (16) at the operating pressure. The pressure (p) of the reagent is measured between the pump and the dosing valve. The measurement of the temperature of the reagent is taken into account by determining the limit values (46,47,48,49). Independent claims are included for the following: (1) a device for diagnosing a dosing system; and (2) a computer program with a computer program product for executing the method.