Dosing module

A method of operating a dosing module for an emissions abatement system, the dosing module including an armature, a coil for moving the armature and a valve body having an outlet, wherein in normal operation the armature is moveable between a first position, in which the outlet is closed by the armature, and a second position, in which the armature is spaced apart from the outlet, and wherein, in use, application of electricity to the coil at a first level of energy causes the armature to move from the first position to the second position, the method comprising:

• (a) determining that the dosing module is in a blocked condition;
• (b) increasing the temperature of the dosing module by applying electricity at a second level of energy that is greater than the first level of energy to the coil;
• and
• (c) heating the dosing module until the dosing module is in an unblocked condition, in which liquid can flow through the dosing module, the method further comprising at least one or more of:
• (d) operating the dosing module to pass liquid through the dosing module, and/or wherein the step of determining that the dosing module is in a blocked condition includes determining that flow of a liquid through the dosing module is prevented and/or wherein the step of determining that the dosing module is in a blocked condition includes:
• (i) determining a first pressure of a liquid to be supplied by the dosing module prior to actuation of the dosing module;
• (ii) determining a second pressure of a liquid to be supplied by the dosing module during actuation of the dosing module;
• and
• (iii) comparing the first pressure and the second pressure, for example wherein, in step (iii) the second pressure is greater than the first pressure.