ARRANGEMENT AND METHOD FOR A DOSING SYSTEM FOR SUPPLY OF A REDUCING AGENT IN THE EXHAUST FLOW FROM A COMBUSTION DEVICE

摘要

The invention relates to an arrangement and a method for a dosing system for supply of a reducing agent in the exhaust flow from a combustion device such as a combustion engine. More specifically, the invention relates to how to identify whether incorrect agent is used as reducing agent in an exhaust post-treatment system. Incorrect agent can be indicated by detecting the temperature of the exhaust gases and comparing it with normal values which occur when using correct reducing agent. This indication makes it possible for continued dosing of an incorrect agent to be halted. If for example fuel is dosed instead of intended reducing agent, the temperature of the exhaust gases will be higher than might normally be expected and the damage which might occur as a result of high exhaust temperatures can be avoided.