Diesel particulate filter (DPF) segmented regeneration method

Abstract

The invention provides a Diesel particulate filter (DPF) segmented regeneration method which comprises the following steps of when an active regeneration condition is met, entering a regeneration control stage I; judging whether the end condition of the regeneration control stage I is met or not, and entering a regeneration control stage II if the end condition of the regeneration control stage I is met; judging whether a regeneration ending condition is met or not; and if the regeneration ending condition is met, quitting regeneration, and completing the regeneration control. According to the method, the temperature of the DPF during active regeneration can be simply and accurately controlled, carbon in the DPF can be efficiently combusted, the phenomenon of temperature overshoot of the DPF in the active regeneration temperature control process is effectively avoided, balance between the safety of the DPF and the regeneration efficiency of the DPF is achieved, and the method is suitable for large-scale application.

Description

technical field [0001] The invention relates to the technical field of diesel engine control, in particular to a DPF section regeneration method. Background technique [0002] National Ⅵ heavy-duty diesel vehicle emission regulations clearly require PM emission limits, and now diesel engine particulate filters DPF are commonly used to capture particulate matter in exhaust gas to reduce particulate matter emissions. As the engine runs for a period of time, the particulate matter captured by the DPF will gradually increase, resulting in an increase in the exhaust back pressure of the engine and a decrease in engine performance. Therefore, it is necessary to regenerate the DPF at high temperature to remove the particulate matter in the DPF carrier. [0003] DPF active regeneration adopts adding HCI fuel injection before DOC to increase DPF temperature to realize particulate matter regeneration in DPF; DPF active regeneration control methods in the prior art all adopt a one-sta...

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Problems solved by technology

[0003] DPF active regeneration uses HCI fuel injection before DOC to increase DPF temperature to achieve particulate matter regeneration in DPF; DPF active regeneration control methods in the prior art all adopt one-stage regeneration control method, and the required temperature is set too high to meet regeneration efficiency DPF temperature overshoot is prone to occur, such as figure 2 , leading to high-temperature melting of DPF and affecting DPF safety; if the set required temperature is too low, DPF regeneration efficiency will be low, frequent regeneration will occur, and fuel consumption will be high

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