DPF active regeneration safety control method

Abstract

The invention discloses a DPF active regeneration safety control method, and belongs to the technical field of regeneration safety. The DPF active regeneration safety control method comprises the following steps that S10, regeneration conditions are judged; S20, the HC injection condition is judged; S30, the amount of HC needing to be injected to reach T0 is calculated, T1=T0-T2, T2 is the buffer temperature, and T2 is gradually reduced to 0 along with reduction of the carbon loading amount and increase of the regeneration time t1; and S40, temperature control is conducted. In the step S10, when one of operation condition parameters of an engine reaches a regeneration threshold value corresponding to the parameter, a DPF enters active regeneration; in the step S20, when T4 is greater than or equal to T7, the HC injection condition is met; and in the step S40, when T5 is greater than T0 and less than or equal to T3, the initial HC injection amount is reduced, the change rate of HC injection is reduced, when T5 is greater than T3 and less than or equal to T6, the injection amount of HC is reduced, and the amount of tail gas exhausted into the DPF by the engine is increased, and when T6 is less than T5, HC injection is stopped, and the amount of the tail gas exhausted into the DPF by the engine is increased. The DPF active regeneration safety control method has the following beneficial effect that the safety of active regeneration of the DPF can be high.

Description

technical field [0001] The invention relates to the technical field of regeneration safety, in particular to a DPF active regeneration safety control method. Background technique [0002] Diesel particulate filter (Diesel Particulate Filter, DPF for short) is currently recognized as the most effective treatment technology for particulate matter in diesel engine exhaust; although DPF can filter the carbon particles in the exhaust from the exhaust of diesel engines, so that It is deposited in the carrier, but it does not remove carbon particles by itself. When more and more carbon particles accumulate in the carrier, it will gradually increase the flow resistance of the exhaust gas, increase the exhaust back pressure of the diesel engine, affect the power output of the diesel engine, and increase fuel consumption. Therefore, the carbon particles must be removed in time to restore the flow resistance of the exhaust gas; although the exhaust gas temperature always has a passive...

AI Technical Summary

Problems solved by technology

[0005] However, the current HC injection calculation calculates a large amount of HC injection at the initial stage of injection, which can easily lead to excessive HC injection due to the large carbon load at the beginning of the DPF, and the instantaneous injection of too much HC injection is very small. It is easy to cause the DPF temperature to rise instantaneously, which leads to the safety problem of DPF regeneration, which makes the safety of DPF active regeneration lower; and in the process of DPF active regeneration, due to various complex working conditions, it is easy to cause abnormal fluctuations in DPF temperature, which makes DPF When the temperature rises instantaneously, it is easy to cause the safety problem of DPF burning, which leads to the low safety of active regeneration of DPF

Images