Testing of an airflow meter used with a motor vehicle combustion engine to ensure its correct operation by switching off exhaust gas recirculation and then measuring airflow and comparing it with a stored value

摘要

Method for testing the operation of an air mass-flow meter of a combustion engine with exhaust gas recirculation. The air flow meter measures the airflow in a suction inlet to the engine. During testing of the meter exhaust gas circulation is switched off and the airflow is the total air input to the engine. The measured signal is compared with a comparison value and if it exceeds it by more than a preset limit, faulty operation of the meter is signaled. Comparison values are determined experimentally and used to create a characteristic curve, where the airflow value depends on engine operating parameters, such as engine speed and loading.