Evaluation method for reliability of measured value of dpf differential pressure sensor and diesel engine

Abstract

The embodiment of the present application provides a method for evaluating the reliability of a measured value of a DPF differential pressure sensor and a diesel engine. The evaluation method includes: after the engine of the diesel engine is started and the current state of the diesel engine satisfies a first condition, obtaining a first The first pressure drop detected by the DPF differential pressure sensor within a period of time, and based on the first pressure drop, calculate the difference between the actual pressure drop upstream and downstream of the DPF and the preset pressure drop within the first period of time The integration result is used to determine whether the measured value of the DPF differential pressure sensor is unreliable according to the comparison result between the integration result and the first limit value, so as to improve the judgment accuracy of whether the measured value of the DPF differential pressure sensor is unreliable, Reduces the probability of inaccurate estimates of the amount of particulate matter trapped by the DPF due to unreliable measurements of the DPF differential pressure sensor.

Description

technical field [0001] The present application relates to the technical field of exhaust emission, and in particular, to a method for evaluating the reliability of a measured value of a DPF differential pressure sensor and a diesel engine. Background technique [0002] Particulate matter is one of the main pollutants in diesel engine exhaust emissions. At present, the most effective after-treatment device for reducing diesel engine particulate matter emissions is a wall-flow particulate filter (DPF). When the particulate matter captured by the DPF reaches a certain limit, measures need to be taken to clean the particulate matter in the DPF, that is, DPF regeneration. [0003] At present, in the prior art, a differential pressure sensor is usually installed at both ends of the DPF, and the pressure difference between the two ends of the DPF measured by the differential pressure sensor is used to judge whether the particulate matter captured by the DPF reaches the limit, but i...

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Problems solved by technology

[0003] At present, in the prior art, a differential pressure sensor is usually installed at both ends of the DPF, and the differential pressure value at both ends of the DPF measured by the differential pressure sensor is used to judge whether the particulate matter captured by the DPF has reached the limit value, but in specific applications , Leakage in the pipeline joint of the differential pressure sensor or damage to the differential pressure sensor will lead to a large deviation between the measured value of the differential pressure sensor and the true value of the differential pressure at both ends of the DPF, resulting in the The pressure difference value is inaccurate in estimating the amount of particulate matter captured by the DPF, which in turn affects the regeneration of the DPF

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