Patent ID: 7818962

Claim:
A method for control of a motorization system including a diesel engine, an air-intake circuit, and an exhaust circuit for exhaust gas originating from the engine, the intake circuit including an adjusting mechanism for controlling flow of air entering the engine and the exhaust circuit including a nitrogen oxides trap for storage of nitrogen oxides contained in the exhaust gases, the method performing a regeneration mode to regenerate the nitrogen oxides trap by supplying reducing exhaust gases, the method comprising: determining an index value of air flow corresponding to an operating point of the engine during the regeneration mode; instructing the adjusting mechanism to obtain an air flow close to the index value; measuring a variable back-pressure in the exhaust circuit; performing a primary and secondary injection of fuel, the secondary injection being performed during an expansion phase and operative to maintain the exhaust gases in a reducing state; and maintaining a constant fuel flow amount of the primary injection, increasing a fuel flow amount of the secondary injection, and increasing the air flow according to an increase in the variable back-pressure such that said diesel engine delivers a constant torque during a transition to said regeneration mode.