Diesel engine dpf carbon load initialization self-learning method
A self-learning method and DPF technology, which is applied in the field of DPF carbon load initialization and self-learning of diesel engines, can solve the problems of carbon load measurement deviation and change, and achieve the effect of avoiding influence.
Active Publication Date: 2021-06-11
WUXI WEIFU LIDA CATALYTIC CONVERTER
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However, there are differences in the processing process of different DPF carriers. The deviation of the flow resistance (the ratio of DPF pressure difference to the volume flow rate of air passing through the carrier) of different carriers in the same batch is about 10%. This deviation is caused by the carrier production process and is inevitable. ;The DPF carrier is coated with an oxide coating material, and the deviation is enlarged to about 15%. The deviation of the flow resistance directly leads to the deviation of the carbon load measurement. Because the DPF carbon load and the flow resistance are in one-to-one correspondence, the change of the flow resistance directly leads to carbon load change
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[0017] The present invention will be further described below in conjunction with specific drawings and embodiments.
[0018] like figure 1 As shown, the diesel engine exhaust aftertreatment device usually includes DOC, DPF, and SCR; a back pressure sensor 1 and a temperature sensor 6 before the DOC are arranged upstream of the DOC, the DPF is connected after the DOC, and the SCR is connected after the DPF; a heating wire 5 is provided on the DPF, A differential pressure sensor 7 is provided before and after the DPF; a temperature sensor 8 is provided downstream of the DPF;
[0019] A DPF carbon load testing device, including a check valve 2, a direct current blower 3 and an air flow meter 4; the direct current blower 3 is connected to the inlet side of the DPF through the check valve 2, and there is an air flow between the check valve 2 and the DPF. Flow meter 4; check valve 2 ensures that air can only be blown from one side of the DC fan to the DPF side, and the air flow met...
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The invention provides a self-learning method for initializing the carbon load of a diesel engine DPF, which includes: when the engine is in a shutdown state, a constant air mass flow rate is provided to the DPF through the operation of the fan, and the high-temperature regeneration treatment is first performed on the DPF under the condition that the DPF satisfies the regeneration mechanism. Then measure the pressure difference of the DPF carrier, convert the DPF flow resistance according to the air mass flow rate flowing through the DPF carrier, the volume of the DPF carrier, and the pressure difference of the DPF carrier during measurement, and query the previously calibrated flow resistance and carbon load correspondence table to get this The carbon load corresponding to the current flow resistance; subtract the carbon load at this time from zero to get the deviation value of the carbon load, and add the deviation value to the previously calibrated flow resistance and carbon load correspondence table, so that the carbon The load data has an overall offset, that is, a new flow resistance and carbon load correspondence table is obtained; the invention can eliminate the influence of different carriers on the DPF carbon load calculation due to processing errors.
Description
technical field [0001] The invention relates to the technical field of aftertreatment of diesel engine exhaust, in particular to a self-learning method for initializing the carbon load of a diesel engine DPF. Background technique [0002] The main technical route of diesel engine exhaust after-treatment in the National VI stage is DOC+DPF+SCR. At present, the test of DPF carbon load is based on the pressure difference under different exhaust mass flow rates or the calculation based on the carbon load model. However, there are differences in the processing process of different DPF carriers. The deviation of the flow resistance (the ratio of DPF pressure difference to the volume flow rate of air passing through the carrier) of different carriers in the same batch is about 10%. This deviation is caused by the carrier production process and is inevitable. ;The DPF carrier is coated with an oxide coating material, and the deviation is enlarged to about 15%. The deviation of the f...
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IPC IPC(8): F01N11/00
CPCF01N11/00F01N2900/1606Y02T10/40
Inventor 卢丰翥刘洋侯富华刘永昌
Owner WUXI WEIFU LIDA CATALYTIC CONVERTER