Diagnostic procedure for particulate filter arranged in effluent stream of combustion engine, involves comparing detected particle mass concentration with selected particle mass concentration threshold value

摘要

The procedure involves detecting an operating mode parameter (101) of a combustion engine and detecting a particle mass concentration (103) of effluent stream downstream a particulate filter. A particle mass concentration threshold value is selected (105) in dependence of detected operating mode parameter from a set of particle mass concentration threshold values. The detected particle mass concentration is compared (107) with the selected particle mass concentration threshold value. Independent claims are also included for the following: (1) a method for forming a particle mass concentration threshold value (2) a diagnostic system (3) a device for forming a particle mass concentration threshold value (4) a computer program comprising a set of instructions for a diagnostic procedure.