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Exhaust emission control system for internal combustion engine, and control method for exhaust emission control system
Exhaust emission control system for internal combustion engine, and control method for exhaust emission control system
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机译:内燃机的废气排放控制系统以及废气排放控制系统的控制方法
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摘要
An exhaust emission control system for an internal combustion engine (1) includes: an urea aqueous solution addition valve (230) that supplies urea aqueous solution to an exhaust passage (26); and an urea aqueous solution supply tube (240) that supplies urea aqueous solution to the urea aqueous solution addition valve (230). When it is determined that a second exhaust gas temperature (TH2) upstream of a selective reduction NOx purification catalyst (41) is higher than or equal to a reference temperature (YES in step S11), a control device (80) executes recovery control for recovering urea aqueous solution in the urea aqueous solution supply tube (240) (step S14).
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