Method and system for controlling regeneration temperature of diesel particulate filter

Abstract

The invention discloses a method and system for controlling a regeneration temperature of a diesel engine particulate matter collector. The method comprises a first step of presetting a particulate matter collector prior set temperature and steady state correction fuel injection quantities corresponding to different exhaust gas mass flow; a second step of determining current steady state fuel injection quantities according to the current exhaust gas mass flow, the particulate matter collector prior set temperature and the actual temperature in an oxidized catalytic converter; a third step of determining the current fuel injection quantity after steady state correction according to the current steady state fuel injection quantity and the steady state correction fuel injection quantity corresponding to the current exhaust gas mass flow, and outputting corresponding oil injection signals to an aftertreatment diesel injection system; and a fourth step of performing closed-loop control on the current fuel injection quantity after steady state correction according to a difference value between the particulate matter collector prior set temperature and the particulate matter collector prior actual temperature. According to the method, steady state correction is performed on the current steady state fuel injection quantity, the influence on heat transfer of an oxidized catalytic converter carrier caused by exhaust gas is eliminated, and the regeneration temperature of the diesel engine particulate matter collector can be controlled accurately.

Description

technical field [0001] The invention relates to the technical field of post-treatment of diesel engine exhaust, in particular to a method and system for controlling the regeneration temperature of a diesel particulate matter trap. Background technique [0002] Please refer to figure 1 , figure 1 It is a schematic diagram of the structure of the aftertreatment system of the diesel engine, and the arrows in the figure indicate the flow direction of the exhaust gas of the diesel engine. [0003] The post-treatment system of a diesel engine mainly includes an oxidation catalytic converter (DieselOxidationCatalysis, DOC), a particulate filter (DieselParticulateFilter, DPF), a selective catalytic converter (SelectiveCatalyticReducton, SCR) and an ammonia trap (ASC) arranged along the exhaust gas flow direction. ). [0004] The exhaust of the diesel engine first passes through the oxidation catalytic converter. Under the action of the catalyst, the HC, CO and SOF (Soluble Organi...

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Problems solved by technology

[0013] In the actual working process, the heat exchange between the exhaust gas and the oxidation catalytic converter and the change of the exhaust gas flow will all affect the actual temperature in front of the particulate matter trap. The above two control methods are not considered, so they cannot be accurate. Control the amount of fuel injection to avoid unsatisfactory regeneration temperature or out-of-control regeneration temperature

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