Patent ID: 9020736
Filing Date: 2015-04-28
Classification: F02D,G01F,Y02T

Abstract:
1. A fault diagnosis apparatus for an airflow meter for detecting an actual intake air quantity, comprising: means for detecting a rotation speed of an internal combustion engine: and means for estimating an intake air quantity, wherein it is determined that the airflow meter has a fault when a divergence value of the estimated intake air quantity calculated by the intake-air-quantity estimation means with respect to the actual intake air quantity obtained by the airflow meter is greater than a fault determination reference value determined based on the rotation speed of the internal combustion engine, wherein it is determined that the airflow meter is normal when the rotation speed of the internal combustion engine is higher than or equal to a predetermined engine rotation speed under a specific condition that the divergence value of the estimated intake air quantity with respect to the actual intake air quantity is less than or equal to the fault determination reference value, and wherein a current determination result is maintained when the rotation speed of the internal combustion engine is less than the predetermined engine rotation speed under the specific condition.