Method for estimating carbon load of diesel engine exhaust particle trap

Abstract

The invention relates to a method for estimating the carbon load of a diesel engine exhaust particle trap. The method comprises the following steps that 1) the steady-state working condition of the diesel engine is selected, and the waste gas flow of the exhaust particle trap of the diesel engine under the working condition is determined; 2) the corresponding to front-and-back pressure drop of theDPF in the idle-load and the load-limiting state under the exhaust flow is determined; 3) according to the obtained corresponding to the pressure drop value of the DPF in the idle-load and the load-limiting state under the same exhaust flow rate, and a mathematical model for calculating the carbon load of the DPF is built; 4) the actual measured DPF front-back pressure drop is substituted into the mathematical model under the exhaust flow, the carbon load value of the current DPF is calculated; and 5) the current DPF carbon load value is compared with the DPF carbon load limit value, and whether the current diesel engine exhaust particle trap state needs to be regenerated or not is judged. According to the method, the carbon loading capacity of the particle trap can be accurately estimated, the estimation result reliability is high, and the DPF can be promoted to regenerate in time.

Description

technical field [0001] The invention relates to the technical field of post-treatment of diesel engine exhaust, in particular to a method for estimating the carbon load of DPF of a diesel engine. Background technique [0002] There are three main types of exhaust particulate matter from diesel engines: carbon particles (Soot), surface-adsorbed organic soluble matter (Soluble organic fractions, SOF for short) particles, and sulfate particles. Diesel engine exhaust particles are mostly composed of Soot and SOF particles. [0003] Diesel Exhaust Particulate Filter (DPF) is a particulate filter installed in the exhaust pipeline of a diesel engine, which captures particulate matter in the exhaust to achieve the purpose of purifying the exhaust. When the diesel engine exhaust flows through the DPF, the particulates in the exhaust are captured by the DPF through interception, diffusion, gravity settlement and inertial collision. The capture efficiency is mainly affected by the fil...

AI Technical Summary

Problems solved by technology

Some related studies have proposed methods based on vehicle mileage or working hours to estimate the carbon load of DPF. The method is simple, low-cost, and relatively easy to implement. However, due to the complex and changeable working conditions of diesel engines in actual vehicle operation, these methods The accuracy of judging the timing of regeneration is not high and has certain limitations

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