Method and system for detecting overload of DPF

Abstract

The invention discloses a method and system for detecting overload of a DPF. The method comprises the steps that when it is judged that the current state of an engine meets a preset steady state condition strategy, whether the DPF enters a monitoring state or not is determined according to the upstream and downstream pressure difference value of the DPF and the downstream pressure value; and if the time that the DPF is continuously in the monitoring state exceeds a time threshold value, it is confirmed that the DPF is in an overload state. The steady-state condition that the waste gas volume flow exceeds the preset volume and the change rate is smaller than the threshold value is met, the steady-state condition serves as the precondition of DPF overload monitoring, and therefore the judgment accuracy is improved. A differential pressure sensor is installed on the DPF, upstream and downstream differential pressure and downstream pressure are collected, whether judgment conditions are met or not is judged, then monitoring time is accumulated, whether the monitoring time exceeds a time threshold value or not is judged, the overload problem is reported, and accurate monitoring of DPF overload is achieved. And the loss caused by inaccurate estimation of the carbon loading capacity in the DPF in the actual environment is avoided.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a method and system for detecting DPF overload. Background technique [0002] DPF, (Diesel Particulate Filter) is a ceramic filter installed in the exhaust system of a diesel engine, which captures particulate emissions before they enter the atmosphere. In order to reduce the amount of dust discharged into the atmosphere, the DPF should be monitored in real time according to regulations and actual needs. [0003] DPF mainly filters and traps particulates in engine exhaust through diffusion, deposition and impact mechanisms. When the exhaust gas flows through the trap, the particles are trapped in the filter element of the filter body, and the cleaner exhaust gas is discharged into the atmosphere. The working principle is: when the engine exhaust gas flows through the oxidation catalyst (DOC), at a temperature of 200-600°C, CO and HC are first almost completely oxidized into CO2...

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for detecting DPF overload, which is used to solve the problems of inaccurate sensor detection, false positives or false positives in the prior art. The engine set includes:

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