Method for on-board error diagnosis in operation of internal combustion engine of motor vehicle, involves determining actual emission value in actual operating condition, and generating error signal based on index value

摘要

The method involves determining a reference value for emission i.e. soot- or nitrogen oxide emission, of an internal combustion engine based on a set value for air- and fuel path. An actual emission value is determined in an actual operating condition. An index value is determined, where the index value corresponds to quotients from integral of the actual emission value and integral of the reference value at a time interval. An error signal is generated based on the index value, and emission control of the engine is taken place based on the error signal. An independent claim is also included for a device for on-board error diagnosis in operation of an internal combustion engine.