A method of operating a controller, controller program, controller program product, and apparatus for performing the method

摘要

The invention relates to a method for operating a control device (26) which activates a reagent dosing system (30) arranged in a motor vehicle. The method comprises: - electrical decoupling of a first power supply input (32) of the control device (26) at which a start-up voltage (Kl-15) of the motor vehicle is from the start-up voltage (Kl-15) in the absence of commissioning Voltage (Kl-15), - establishing an electrical connection between the at a second power supply input (34) of the control device (26), at which a main power supply voltage (Kl-30) of the motor vehicle is located, and the first power supply Input (32) at the latest at the beginning of a control unit overrun, during which the reagent dosing (30) is emptied, for a period of time which corresponds at least to the duration of the control unit overrun, - starting the control unit (26) after a previous omission of the Main power supply voltage (Kl-30) after the main power supply voltage (Kl-30) reappears, - polling a status signal (42) stored in the controller (26), w elche a completed or not completed controller overrun (62) signals, and - restarting the controller overrun (62) and thus emptying the reagent dosing (30) when it is detected from the status signal (42) that the last control unit caster (62) was not completed.