Method for diagnosing air supply circuit for supplying air to burner of exhaust gas aftertreatment system of exhaust system of internal combustion engine

A method for diagnosing an air supply circuit (23) for supplying air to a burner (21) of an exhaust aftertreatment system (14) of an exhaust system (2) of an internal combustion engine (1), in which the air supply circuit (23) is provided with a pumping device (24) housed along a first duct (25) regulated by a shut-off valve (26). The method entails housing a first pressure sensor (33) along a first conduit (25) interposed between the pumping device (24) and the burner (21); a second pressure sensor (34) is housed along a second conduit (35) outside the burner (21); acquiring pressure signals (P33, P34) detected by the first and second pressure sensors (33, 34); a fault and/or failure (F) in the gas supply circuit (23) is diagnosed on the basis of the pressure signals detected by the first and second pressure sensors (33, 34). 一种用于诊断向内燃机(1)的排气系统(2)的废气后处理系统(14)的燃烧器(21)供应空气的供气回路(23)的方法，其中，供气回路(23)设置有泵送设备(24)，所述泵送设备(24)沿由截止阀(26)调节的第一管道(25)被容纳。所述方法需要沿插设于泵送设备(24)和燃烧器(21)之间的第一管道(25)容纳第一压力传感器(33)；沿燃烧器(21)外的第二管道(35)容