Urea injection control method and device and electronic device

Abstract

The invention provides a urea injection control method and device and an electronic device. When urea injection is carried out and the preset condition of multiple urea injections is met, urea corresponding to the total urea injection amount is injected according to the determined urea injection frequency, the injection amount of each time is the single urea injection amount obtained through calculation according to the total urea injection amount and the urea injection frequency, and the injection frequency is the urea injection frequency. According to the urea injection control method and device and the electronic device, the urea can be injected in a multiple urea injection manner under the low-speed and low-load working condition, compared with the manner that urea injection is completed at a time, the injection amount of single injection is reduced, and the probability that the injected urea collides with a wall in an SCR system can be reduced; and meanwhile, the injection amountof single urea is reduced, heat needed by urea evaporation can be reduced, then the probability of urea crystallization can be reduced, and therefore the tail gas treatment efficiency of the SCR system is improved, the service life of the SCR system is prolonged, and the performance of the SCR system is improved.

Description

Technical field [0001] The invention relates to the field of post-treatment, and more specifically, to a urea injection control method, device and electronic equipment. Background technique [0002] National VI diesel engines have continuously improved emission requirements. In order to reduce the emission of nitrogen oxides and NOx in the exhaust gas, urea can be injected into the selective catalytic reduction technology SCR system. The injected urea chemically reacts with the NOx in the SCR system, thereby reducing the NOx emission. [0003] However, under low-speed and low-load conditions, the probability of urea crystallization in the SCR increases. When the amount of urea crystallization in the SCR is large, the exhaust gas treatment efficiency of the SCR system will be reduced, and the service life and performance of the SCR system will be reduced. Summary of the invention [0004] In view of this, the present invention provides a urea injection control method, device and ele...

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Problems solved by technology

[0004] In view of this, the present invention provides a urea injection control method, device and electronic equipment to solve the problem that under low-speed and low-load conditions, the probability of urea crystallization in the SCR increases, and when the amount of urea crystallization in the SCR is large, the SCR will be reduced. The exhaust gas treatment efficiency of the system, and will reduce the service life and performance of the SCR system

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