Diesel vehicle DPF active regeneration temperature control method

Abstract

The invention relates to a diesel vehicle DPF active regeneration temperature control method. The diesel vehicle DPF active regeneration temperature control method successively includes the followingsteps that (1) the DOC inlet temperature T1 and the DPF inlet temperature T2<original> before fuel injection are red, the DPF inlet regeneration target temperature T3 is selected, the initial fuel-injection quantity q of an HC injection unit (9) is calculated or selected, and fuel is injected into the inlet of a DOC (1) according to the initial fuel-injection quantity q; (2) the DPF inlet temperature T2<k> is red again, and the next fuel-injection quantity q<k+1> of the HC injection unit (9) is redetermined; (3) the fuel-injection quantity injected into the inlet of the DOC (1) is adjusted tothe next fuel-injection quantity q<k+1> determined in the step (2); (4) the DPF inlet temperature T2<k> is read again, and the next fuel-injection quantity q<k+1> of the HC injection unit (9) is redetermined; and (5) the step (4) is repeated. According to the diesel vehicle DPF active regeneration temperature control method, rapid regeneration of the DPF is achieved with low fuel consumption and good regeneration temperature, and the regeneration efficiency of the DPF is high.

Description

technical field [0001] The invention relates to a method for regenerating a particle trap used for purifying engine exhaust gas, in particular to a method for controlling the active regeneration temperature of a diesel vehicle DPF. Belonging to the technical field of engine exhaust purification, Background technique [0002] Particulate matter is one of the main pollutants in diesel exhaust emissions. The National VI emission regulations not only tightened the PM mass emission limit by 67%, but also increased the limit on the concentration of solid particulate matter PN. In order to meet the strict PM and PN emission requirements, the diesel particulate filter DPF is currently recognized as an after-treatment device that can effectively eliminate diesel engine exhaust particles. Diesel engine DPF regeneration control is one of the key technologies for the aftertreatment of the National VI diesel engine. Due to the national VI emission standards that have increased the emi...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and deficiencies in the prior art that the regeneration temperature control error is large, the calculation formula is complicated, the calibration parameters are many, and the control consistency is poor, and to provide a method for controlling the active regeneration temperature of a diesel vehicle DPF

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