• When the SCR control unit detects that AdBlue® injection is available, it sends a drive signal to the pump to pump AdBlue® from the urea tank and charge the pipe.
AdBlue® pressure stability control
• The SCR control unit controls the pump amount and maintains the pressure in the urea lines to
5,000 hPa based on the urea pump pressure sensor signal.
AdBlue® recovery control
• After the ignition is switched off, the SCR control unit drives the reverting valve in the urea pump, recovers the AdBlue® in the pipe, and returns it to the urea tank. (If ignition is switched off before charging control operates, this control cancels.)