Method for operating a dosing apparatus and motor vehicle having a dosing apparatus

A motor vehicle, comprising:

• an internal combustion engine;
• an exhaust-gas treatment apparatus configured to purify exhaust gases from said internal combustion engine;
• a tank configured to store a liquid additive;
• and
• a dosing apparatus configured to feed the additive from said tank to said exhaust-gas treatment apparatus;
• said dosing apparatus including a pressure accumulator, at least one pump configured to deliver the additive from said tank into said pressure accumulator, a dosing valve configured to provide additive present in said pressure accumulator in a dosed manner, and a return valve configured to discharge the additive present in said pressure accumulator back into the tank;
• and
• said dosing apparatus configured to:
• a) identify a dosing demand;
• b) activate said at least one pump to build up a pressure in said pressure accumulator;
• c) set the pressure in said pressure accumulator to a dosing pressure;
• and
• d) dispense the additive through said dosing valve.