In an exhaust purifying apparatus for an internal combustion engine on a vehicle, heating control is executed for supplying fuel to exhaust purification catalysts, thereby increasing the catalyst bed temperature. The heating control is suspended when the vehicle is determined to be driving downhill....http://www.google.co.uk/patents/US8079212?utm_source=gb-gplus-sharePatent US8079212 - Exhaust purifying apparatus and exhaust purifying method for internal combustion engine
