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| Fault Diagnosis Strategy Function Development of Gasoline Particulate Filter in Compliance with China Ⅵ Regulation |
| DOI：10.13949/j.cnki.nrjgc.2022.04.011 |
| Key Words:gasoline particulate filter（GPF） on-board diagnostics（OBD） fault diagnosis strategy development differential pressure sensor |
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| Abstract:Based on the gasoline particulate filter（GPF） differential pressure model established by the differential pressure–flow characteristics， a GPF characteristic factor algorithm（FGC） based on the differential pressure measurement value–model value was proposed， which could accurately characterize the connection state of the pressure pipeline and the GPF carrier status. Taking into account the GPF carrier characteristics， the measurement deviation of the differential pressure sensors， and the flow resistance caused by the outlet elbow， the FGC algorithm was improved to the differential pressure gradient correction method， and the appropriate diagnosis window was obtained through the analysis of the world-harmonized light-duty vehicle test cycle（WLTC）. The actual vehicle verification results showed that the GPF removal failure in the WLTC cycle could be accurately diagnosed and the in-use performance ratio（IUPR） numerator for the GPF monitor group of the on-board diagnostics（OBD） system had successfully increased. The statistical analysis of the vehicle road test results showed that the diagnosis threshold met the 3σ standard， which achieved the balance requirement of diagnosis strategy between accuracy and real-time performance. |
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