A Calculation Method of Carbon Loading Based on DPF Upstream and Downstream Dynamic Temperature Changes

Abstract

The invention relates to a method for calculating the carbon loading amount on the basis of the DPF upstream and downstream dynamic temperature changes. The flowing resistance in a DPF catalytic box can be increased when the carbon accumulation amount is increased, therefore, the average flowing speed of gas in the catalytic box can be decreased, and the transmission time of the upstream temperature and the downstream temperature at an inlet of the catalytic box is prolonged. Meanwhile, accumulated carbon can be attached to the surface of a carrier, therefore, the heat exchange process of gasand the catalytic box changes, and then the changes of the upstream and downstream temperature of the catalytic box in a dynamic working condition have the significant correlation with the carbon accumulation amount. Therefore, upstream and downstream temperature change process information is collected under the dynamic working condition that the engine rotation speed or load changes according tothe related rule between the carbon accumulation amount and the dynamic temperature, and the carbon accumulation amount in the DPF catalytic box is calculated through the dynamic temperature changes.

Description

technical field [0001] The invention belongs to the technical field of post-treatment of diesel engine exhaust, and in particular relates to a method for measuring carbon loading based on dynamic temperature changes upstream and downstream of a DPF. Background technique [0002] On June 22, 2018, my country passed the "Heavy Diesel Vehicle Pollutant Emission Limits and Measurement Methods (Phase Six)", which is expected to be implemented on July 1, 2019. In order to meet future emission standards, most domestic manufacturers have adopted the mainstream technology route of DOC+DPF+SCR. Among them, DPF is the most important technology for diesel engine PM treatment. [0003] DPF can cause clogging due to carbon buildup. Although DPF regeneration is mainly passive regeneration, it must have active regeneration capability. When the carbon loading is small, the DPF cannot be fully regenerated and the fuel consumption is high; when the carbon loading is too high, the wall surfa...

AI Technical Summary

Problems solved by technology

However, the model includes combustion and chemical reactions, and there are problems such as large temperature influence, large cumulative error, and insufficient model accuracy. The final calibration workload is heavy and difficult

[0006] Both of the above two methods have certain problems. It is difficult to accurately estimate the carbon loading of DPF. There is an urgent need for a method that uses sensors to directly and effectively characterize the amount of carbon deposition.

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