Exhaust gas recirculation regeneration method and device and vehicle

Abstract

The invention provides an exhaust gas recirculation regeneration method and device and a vehicle, and relates to the field of vehicle exhaust gas recirculation, wherein the method comprises the steps that: the outlet temperature of a diesel particulate filter is determined; the ratio of the actual temperature drop to the theoretical temperature drop of the high-pressure exhaust gas recirculation condenser is determined; and under the conditions that the outlet temperature meets the preset temperature and the ratio of the actual temperature drop to the theoretical temperature drop is less than the preset value, high-temperature waste gas exhausted from an outlet of the diesel particulate filter is guided into a high-pressure waste gas recirculation condenser, and thus regeneration of the high-pressure waste gas recirculation condenser is achieved. The problem of carbon deposition on the upper layer and the bottom layer of the inner surface of a heat exchange element of an EGR condenser is effectively solved, the performance of the EGR condenser is regenerated, and meanwhile emission deterioration caused by the performance degradation problem of the EGR condenser is solved.

Description

technical field [0001] The invention relates to the field of vehicle exhaust gas recirculation, in particular to an exhaust gas recirculation regeneration method, device and vehicle. Background technique [0002] At present, in order to reduce the NOx emission of diesel engines, cooling technology in Exhaust Gas Recirculation (EGR) is widely used in diesel engines. Generally, EGR used in engines mainly includes high-pressure EGR and low-pressure EGR. In the case of high-pressure EGR, EGR is extracted upstream of the turbine and mixed with fresh air downstream of the compressor. In the case of low-pressure EGR, EGR is drawn downstream of the catalytic oxidizer (Diesel Oxidation Catalyst abbreviation DOC) and diesel particulate filter (Diesel Particulate Filter abbreviation DPF), and is mixed with fresh air upstream of the compressor. [0003] At this stage, in order to further improve the effect of EGR and increase the intake air charge coefficient of the engine, EGR usually...

AI Technical Summary

Problems solved by technology

The soot in the exhaust gas passing through the EGR cooler will inevitably deposit on the inner surface of the EGR cooler, especially the high-pressure EGR cooler. These deposits will cause the performance of the high-pressure EGR cooler to decay over time.

[0004] However, there are many problems in the current method for solving the carbon deposition problem of the high-pressure EGR cooler, and the carbon deposition problem cannot be solved well. Therefore, a better and more efficient method for removing carbon deposition is urgently needed

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