A method for judging dpf regeneration of diesel engine

Abstract

The invention discloses a judging method for diesel engine DPF regeneration. Rotational speed and load information are fed back to a diesel engine electrical control unit ECU, and the electrical control unit ECU determines an equivalent load characteristic point corresponding to the working condition and equivalent carbon loading amount corresponding to the equivalent load characteristic point; the electrical control unit ECU calculates the carbon loading amount McN in a particle trap DPF according to the equivalent load characteristic point, the equivalent carbon loading amount correspondingto the equivalent load characteristic point and the running time of the working condition; the period from the time when a diesel engine is started to work to the time when the diesel engine is stopped is recorded as a regeneration judgment cycle, and after the regeneration judgment cycle is completed, the total carbon load amount MN in the particle trap DPF is calculated; and the obtained total carbon loading amount MN is compared with a DPF total carbon loading set value A, and DPF regeneration determination is performed. The judging method for diesel engine DPF regeneration can improve theDPF capture efficiency and achieves the effect of reducing diesel engine exhaust particulate matter emission.

Description

technical field [0001] The invention belongs to the technical field of diesel engines, in particular to a method for judging DPF regeneration of diesel engines. Background technique [0002] In 2018, my country promulgated the national six emission standards for automobiles, which restricts the quality of particulate matter (PM, Particulate Matter) and particle number (PN, Particulate Number) of automobile exhaust. In order to meet the particle emission limit requirements of diesel vehicles, the particulate filter DPF (Diesel Particulate Filter) is generally used to capture the particulate matter in the exhaust gas of diesel engines. After a certain driving time and mileage of the vehicle, the particle filter DPF will be clogged, causing the exhaust back pressure to rise, affecting the economy of the diesel engine and reducing the particle collection efficiency. [0003] During the operation of the diesel engine, CO, HC, CO will be produced after fuel combustion 2 , NO X ...

AI Technical Summary

Problems solved by technology

[0004] The general judgment method for judging DPF regeneration is to measure the exhaust back pressure at both ends of the DPF to judge the amount of particles trapped by the DPF. Based on this, it is judged whether the DPF is regenerated. In addition to being related to the exhaust back pressure, the amount is greatly affected by the engine operating conditions

In addition, the regeneration of the DPF is judged based on the mileage of the vehicle, the running time of the diesel engine, and the fuel consumption of the diesel engine. These methods are poor in judging the accumulation of particulate matter captured by the particulate filter.

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