| 摘要 |
An on-board diagnostic of a vehicle having an internal combustion engine detects loss of filter matrix in a particle filter (e.g. a dpf) of an exhaust system. Two diagnostic checks are run, and respectively optimised to detect a fault condition and a normal condition respectively. In the event of failure to determine a fault condition or a normal condition, an alternative strategy is implemented to change the test parameters. The diagnostic checks may be run simultaneously or consecutively, and may both be run continually at intervals of 100 milliseconds or more. Fault behavior may be determined with reference to a minimum pressure drop across a normal filter, and minimum pressure drop across a filter at a matrix loss threshold, i.e. fully loaded with soot. |
