METHOD FOR MONITORING THE SECONDARY MASS AIR FLOW OF EXHAUST GAS CLEANING EQUIPMENT

摘要

The invention relates to a method for monitoring the secondary air supply fed from a secondary air pump (6) to an exhaust gas duct (3) of an internal combustion engine (1) by the catalyzer (4), and which secondary air supply is measured by a secondary mass air measuring apparatus (7). The variation in time of the measuring signal of the secondary mass air measuring apparatus (7) is compared with plausible measured values, and any malfunctioning in the secondary air supply is determined on the basis of this comparison.