Computer system and a computer-implemented method of controlling the temperature of a selective catalytic reduction system

A computer-implemented method of controlling, for a heavy-duty vehicle traveling along a road, a temperature of a Selective Catalytic Reduction System (SCR) which forms part of an Exhaust After-Treatment System (EATS) of the heavy-duty vehicle, the method comprising:

• obtaining, by processing circuitry of a computer system, topographic data containing information about topography of the road along which the heavy-duty vehicle is currently travelling, the topographic data including information about an upcoming downhill slope;
• acquiring, by the processing circuitry, prediction data indicative of braking requirements for the upcoming downhill slope, the braking requirements including how much brake power and/or brake energy will be needed in the upcoming downhill slope to maintain speed of the heavy-duty vehicle at or below a selected speed limit of the heavy-duty vehicle throughout travel in the downhill slope;
• determining, by the processing circuitry, effects of each of a plurality of brakes on brake power and at least one of exhaust gas temperature or resulting temperature of the SCR, the plurality of brakes comprising service brakes and a plurality of auxiliary brakes;
• determining, by the processing circuitry using a brake blending model, a brake blending combination of the plurality of brakes which allows the SCR to be kept as warm as possible while still fulfilling the braking requirements, the brake blending combination including a concurrent brake blending of the service brakes and a plurality of different types of auxiliary brakes;
• determining, by the processing circuitry, a current temperature of the SCR or an expected temperature of the SCR in the upcoming downhill slope is below a predefined threshold temperature;
• and
• upon determining that the determined current or expected temperature of the SCR is below the predefined threshold temperature, apply the determined brake blending combination to the heavy-duty vehicle while travelling along the downhill slope.