Active regeneration system and method for diesel engine particulate trap

Abstract

The invention discloses an active regeneration system and a method for a diesel engine particulate trap. The active regeneration system comprises a high-frequency ceramic body, an electric heating wire, an oxygen pump electrolyte sheet, and an oxygen guide pipe, wherein the high-frequency ceramic body is filled between a filter body of the particle trap and an outer shell of the particle trap, theelectric heating wire is arranged in the high-frequency ceramic body in a penetrating mode, the oxygen pump electrolyte sheet is arranged in the electric heating wire in a penetrating mode, and the oxygen guide pipe is connected with an inlet chamber of the particle trap. One end of the oxygen pump electrolyte sheet penetrates through the oxygen guide pipe and is electrically connected with an oxygen pump power supply, and the electric heating wire is electrically connected with a heating power supply; the gas inlet end of the particle trap is connected with a tail gas inlet pipe, an oxygen sensor is arranged in the tail gas inlet pipe, and the gas outlet end of the particle trap is connected with a tail gas discharge pipe; and a differential pressure sensor is further arranged in the particle trap, and the heating power supply, the oxygen pump power supply, the oxygen sensor and the differential pressure sensor are electrically connected with a controller respectively. The active regeneration system and method for the diesel particulate trap improve the active regeneration efficiency of the diesel particulate trap.

Description

technical field [0001] The invention relates to the technical field of diesel engine aftertreatment, in particular to an active regeneration system and method for a diesel engine particle filter. Background technique [0002] As the main emission of diesel vehicles, particulate matter is a key factor in the generation of black smoke. Since the particle size is within the respirable size range, it may enter the human lungs. Studies have shown that small particulate matter is the most harmful to human health. In order to effectively control particulate matter emissions, in addition to limiting the quality of particulate matter, it is also necessary to pay attention to the number of particles PN. [0003] At present, the wall-flow particulate filter (DPF) is a known technology that can enable future diesel engines to meet the requirements of PM emission regulations, and the capture efficiency of particulate matter can reach more than 95%. After the particle filter works for a...

AI Technical Summary

Problems solved by technology

However, when the diesel engine is actually running, the oxygen concentration in the exhaust will change. Taking a small non-road single-cylinder diesel engine as an example, the oxygen concentration in the exhaust fluctuates in the range of 12% to 17%. Although the DPF can be regenerated, the regeneration Efficiency is limited, which is detrimental to the stable and effective operation of the particle trap

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