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METHOD FOR CONTROLLING THE QUANTITY OF UREA CRYSTALS PRESENT IN AN EXHAUST LINE OF AN INTERNAL COMBUSTION ENGINE COMPRISING AN SCR CATALYTIC CONVERTER
METHOD FOR CONTROLLING THE QUANTITY OF UREA CRYSTALS PRESENT IN AN EXHAUST LINE OF AN INTERNAL COMBUSTION ENGINE COMPRISING AN SCR CATALYTIC CONVERTER
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机译:控制包含SCR催化转化器的内燃发动机排气管路中存在的尿素晶体数量的方法
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摘要
The invention relates to a method for controlling the quantity of urea crystals present in an exhaust line comprising a catalytic converter for the selective catalytic reduction of nitrous oxides (NOx), referred to as SCR, by means of a reducing agent, said method comprising a step of heating the exhaust line to a sufficient temperature to sublime the urea crystals, this step being triggered periodically on the basis of a computational model and being accompanied by measurements of the quantity of nitrous oxides and/or the quantity of reducing agent at the inlet and outlet of the catalytic converter, then a step of calculating the quantity of urea crystals (MCm) present in the exhaust line on the basis of the measurements taken at the heating stage, then a step of adjusting the computational model on the basis of the quantity of urea crystals calculated in the calculation step. The invention also relates to an engine unit comprising an electronic control unit that implements the control method. Finally, the invention relates to a motor vehicle comprising the engine unit.
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机译:本发明涉及一种用于控制存在于排气管线中的尿素晶体的量的方法,该方法包括用于通过还原剂选择性催化还原一氧化二氮(NOx)的催化转化器,所述催化转化器包括还原剂。将排气管加热到足以升华尿素晶体的温度的步骤,该步骤根据计算模型定期触发,并伴随着进口处一氧化二氮和/或还原剂的测量催化器的出口,然后根据在加热阶段进行的测量计算出排气管线中存在的尿素晶体(MC m Sub>)的数量,然后进行调整根据在计算步骤中计算出的尿素晶体的数量建立计算模型。本发明还涉及一种包括执行该控制方法的电子控制单元的发动机单元。最后,本发明涉及一种包括发动机单元的机动车辆。
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