A method and device for accurate regeneration of dpf based on laser detection of PM concentration

Abstract

The invention discloses a DPF (Diesel Particulate Filter) accurate regeneration method and equipment for inspecting the PM concentration based on laser. Identical pipeline structures are constructed on the front and back sides of a filter, tail gas flow is led out and separated, PM particles are inspected through laser, a filtering effect is obtained according to PM particle concentration data on both sides, and oil atomizers which are installed on the front sides of DPF cavities are controlled to perform oil injection and regeneration when the PM particle concentration is lower than a regeneration threshold; the equipment comprises two laser detection devices and the oil atomizers, wherein the two laser detection devices are respectively installed on the DPF cavities in the both sides of the filter, the oil atomizers are installed on inlet sides, controllers are respectively connected with the two laser detection devices and the oil atomizers, and each laser detection device comprises laser detection equipment, a gas leading pipe, a gas return pipe, a speed limited exhaust fan, a PM cutter and a measuring pipeline. According to the DPF accurate regeneration method and the equipment, the purposes of accurately determining the regeneration time and controlling regeneration can be realized, and the problem of inaccuracy in measurement of an existing differential pressure transducer and a series of consequences caused by inaccurate determination of the regeneration time due to inaccurate measurement can be relived to the maximum.

Description

technical field [0001] The invention relates to an auxiliary device for a particulate trap, in particular to a method and device for accurately regenerating a DPF based on laser detection of PM concentration, especially for post-treatment of diesel vehicle exhaust. Background technique [0002] DPF (Diesel Particulate Filter) is a ceramic filter installed in the diesel engine exhaust system, which can capture particulate emissions before they enter the atmosphere. DPF technology is an effective means to reduce diesel engine exhaust PM emissions. However, when the DPF traps to a certain extent, it is necessary to realize the repeated use of DPF through active fuel injection regeneration. [0003] To determine the timing of active fuel injection regeneration is to judge whether the carbon accumulation in the regenerated DPF meets the regeneration requirements, and to determine when the regeneration system starts to work. The main problems in the current regeneration process a...

AI Technical Summary

Problems solved by technology

The main problems in the current regeneration process are incomplete regeneration, damage to the filter body, and leakage after overload and during regeneration.

Judging the timing of regeneration is essentially judging that the regeneration is too early, the particle deposition quality is too small, the continuous combustion temperature is too low, the flame is easily extinguished during the combustion process, and the regeneration is not complete; the regeneration is too late, and the particle mass is too much, which will cause overheating damage during DPF regeneration. , so it is of great significance to accurately judge the timing of regeneration to ensure the safety of regeneration

[0004] In addition, accurate judgment of regeneration timing improves engine fuel economy. Too high a regeneration frequency will increase the energy consumption of the aftertreatment system, resulting in a decrease in engine fuel economy, while too low a regeneration frequency will cause excessive carbon accumulation in the trap. As a result, the exhaust back pressure rises, the engine performance decreases, and the fuel consumption increases.

Images