Apparatus having an exhaust gas treatment device with an injector for supplying a fluid, motor vehicle having the apparatus and method for operating the motor vehicle

Abstract

An apparatus includes an exhaust gas treatment device for purifying exhaust gases of an internal combustion engine. The exhaust gas treatment device includes at least one injector for supplying a fluid to the exhaust gas treatment device and at least one fan permitting ambient air to be actively delivered to the injector on demand, in order to cool the injector. A motor vehicle having the apparatus and a method for operating the motor vehicle are also provided.

1 . An apparatus, comprising:
 an exhaust-gas treatment device for purifying exhaust gases of an internal combustion engine;   at least one injector configured to supply a fluid into said exhaust-gas treatment device; and   at least one blower configured to deliver ambient air to said at least one injector to cool said at least one injector.   
     
     
         2 . The apparatus according to  claim 1 , wherein said at least one blower has a drive. 
     
     
         3 . The apparatus according to  claim 1 , which further comprises at least one flow-guiding device disposed at said at least one injector and configured to conduct ambient air to said at least one injector. 
     
     
         4 . The apparatus according to  claim 3 , which further comprises a controller configured to activate and deactivate said at least one blower according to demand. 
     
     
         5 . The apparatus according to  claim 1 , which further comprises a temperature sensor disposed at said exhaust-gas treatment device and configured to monitor cooling of said at least one injector. 
     
     
         6 . A motor vehicle, comprising an internal combustion engine and an apparatus according to  claim 1 . 
     
     
         7 . The motor vehicle according to  claim 6 , which further comprises a controller configured to deactivate said at least one blower when a speed of the motor vehicle exceeds a threshold speed and to activate said at least one blower when a speed of the motor vehicle falls below the threshold speed. 
     
     
         8 . The motor vehicle according to  claim 6 , wherein said at least one blower configured to cool said at least one injector is also configured to cool a coolant of said internal combustion engine. 
     
     
         9 . A method for operating a motor vehicle, the method comprising the following steps:
 providing an apparatus having at least one injector;   a) determining an injector reference temperature of the at least one injector;   b) determining a driving state of the motor vehicle; and   c) initiating active cooling of the at least one injector if at least one of the following conditions i) and ii) is fulfilled:
 i) the injector reference temperature lies above an injector threshold temperature, or 
 ii) a low load or high load driving state is present.