The invention provides an automobile tail gas treatment method and device. The method comprises the following steps that the spraying amount of urea, ammonia reserve and parameters of the upstream tail gas at the current moment are acquired, and theoretical ammonia reserve after treatment of the upstream tail gas is obtained by calculation through utilizing the spraying amount of the urea, the ammonia reserve and the parameters of the upstream tail gas; then, correspondingly according to the parameters of the upstream tail gas and the theoretical ammonia reserve, first spraying amount ensuringthat the nitrogen oxide content in the tail gas does not exceed the standard as well as second spraying amount ensuring that the ammonia gas content in the tail gas does not exceed the standard can both be obtained by calculation; and finally, the first spraying amount and the second spraying amount as well as third spraying amount obtained by an ammonia storage closed-loop control system are subjected to a comparison so as to determine whether or not the third spraying amount can ensure that the nitrogen oxide content and the ammonia gas content in the tail gas do not exceed the standard, and if the third spraying amount can cause the nitrogen oxide content and the ammonia gas content in the tail gas to exceed the standard, the actual spraying amount of the urea at the next moment shouldbe adjusted in time, thereby ensuring that the nitrogen oxide content and the ammonia gas content in the tail gas do not exceed the standard.

Automobile tail gas treatment method and device

The present application provides a method for controlling an injection amount of an SCR urea injection system in an engine, the method comprising: using an ammonia loading amount model to calculate a current ammonia loading amount in an SCR reactor on the basis of an injected aqueous urea solution amount and a consumed ammonia amount; obtaining a first urea injection amount on the basis of a target ammonia loading amount and the current ammonia loading amount; using an SCR efficiency model to calculate a second urea injection amount on the basis of a catalyst temperature, an exhaust gas mass flow rate and an aging coefficient in the SCR reactor, a nitrogen-oxygen compound concentration upstream of the SCR reactor, and the current ammonia loading amount; combining the first and second urea injection amounts to obtain a combined urea injection amount; and obtaining a target urea injection amount injected to the SCR reactor on the basis of the combined urea injection amount and a urea injection amount limit value. Using the method described above, the amount of urea injected into the SCR reactor can be precisely controlled, thereby preventing the occurrence of urea crystallization in an engine exhaust pipeline and the SCR reactor.

Injection amount control method and device for scr urea injection system in engine

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Injection amount control method and device for scr urea injection system in engine