Diesel engine DPF active regeneration control method
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A control method and active regeneration technology, which is applied in the direction of machines/engines, mechanical equipment, engine components, etc., can solve the problems of low regeneration temperature control accuracy, poor control consistency, and large number of parameters, so as to reduce errors, reduce parameters, and calculate formula simple effect
Active Publication Date: 2019-01-04
DONGFENG COMML VEHICLE CO LTD
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[0004] The purpose of the present invention is to overcome the defects of low regeneration temperature control precision in the prior art, the large number of parameters to be calibrated in the regeneration temperature feedback control, the difficulty, the long time consumption, and the poor control consistency, and to provide a diesel engine DPF active regeneration control method
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Embodiment 1
[0054] see figure 1 and figure 2 , a kind of diesel engine DPF active regeneration control method, heats DPF2 by injecting fuel oxidation to DOC1 to release heat, comprises the following steps:
[0055] (1) The regenerative controller DCU6 reads the operating conditions of the engine, collects the exhaust gas mass flow rate of the engine fed back by the engine ECU7, the DOC inlet temperature sensor 3 obtains the DOC inlet temperature, and the DPF outlet and inlet differential pressure sensor 5 obtains the DPF outlet and inlet air pressure difference, T1=270°C, ΔP=15kPa, engine exhaust mass flow rate 200kg / h, which meets the regeneration trigger value and triggers regeneration control;
[0056] (2) After the regeneration control is triggered, according to the DOC inlet temperature T1 = 270°C before fuel injection and the DPF inlet regeneration target temperature of 600°C, c p =1.004J / (kg·℃), Q m =200kg / h, H fuel =42760J / kg, η=90%, the calculated initial fuel injection quan...
Embodiment 2
[0064] see figure 1 and figure 2 , a kind of diesel engine DPF active regeneration control method, heats DPF2 by injecting fuel oxidation to DOC1 to release heat, comprises the following steps:
[0065] (1) The regenerative controller DCU6 reads the operating conditions of the engine, collects the exhaust gas mass flow rate of the engine fed back by the engine ECU7, the DOC inlet temperature sensor 3 obtains the DOC inlet temperature, and the DPF outlet and inlet differential pressure sensor 5 obtains the DPF outlet and inlet Air pressure difference, T1 = 280°C, ΔP = 17kPa, engine exhaust mass flow rate 200kg / h, which meets the regeneration trigger value and triggers regeneration control;
[0066] (2) After the regeneration control is triggered, according to the DOC inlet temperature T1 = 280°C before fuel injection and the DPF inlet regeneration target temperature of 580°C, c p =1.004J / (kg·℃), Q m =200kg / h, H fuel=42760J / kg, η=90%, the calculated initial fuel injection q...
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Abstract
The invention discloses a diesel engine DPF active regeneration control method. The diesel engine DPF active regeneration control method comprises the following steps that the exhaust mass flow of anengine, the DOC inlet temperature and the air pressure difference between a DPF outlet and a DPF inlet are acquired, and whether the regeneration triggering condition at the moment is met or not is judged; when the regeneration triggering condition is met, the regeneration control is triggered, the initial oil injection quantity in the current state is calculated; an oil injection device is controlled to start to perform oil injection, and meanwhile, whether the DPF inlet temperature meets the set regeneration target temperature or not is detected; when the DPF inlet temperature meets the setregeneration target temperature, oil injection is carried out at the current oil injection quantity; when the DPF inlet temperature does not meet the set regeneration target temperature, the fuel oilinjection amount is regulated through a regeneration controller, so that a proper oil injection quantity is guaranteed to be regenerated, and meanwhile, whether the air pressure difference before andafter a DPF is reduced to a set lower limit value or not is detected; and when the regeneration end condition is met, oil injection is stopped, and the regeneration process is completed. According tothe diesel engine DPF active regeneration control method, parameters needing to be calibrated are few, the universality is high, the calculation fluctuation under a feed-forward oil quantity transientcondition is reduced, and the regeneration efficiency is improved.
Description
technical field [0001] The invention relates to the technical field of engine tail gas purification, in particular to an active regeneration control method of a diesel engine particle filter. 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 emission control requirements for low-speed and low-load work areas, the overall exhaust temperature of gener...
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