Fuel injectors dysfunction detection device for internal combustion engine of motor vehicle, has defect determination module determining defect of richness of fuel injectors according to richness difference on cylinders

摘要

The device has an oxygen sensor located in an exhaust pipe (11) of combustion gas to deliver a rough richness signal to an electronic control unit (14). The control unit includes a calculating module (15) for calculating richness difference between the rough richness signal and a filtered richness signal. A defect determination module (16) determines defect of richness of fuel injectors according to the richness difference on each cylinder. The module includes an integration block receiving a value of a high break even point counter, to integrate the richness difference on each cylinder. An independent claim is also included for a method for detection of dysfunction of fuel injectors in an internal combustion engine.