Patent ID: 8909486
Filing Date: 2014-12-09
Classification: F02D,G01F

Abstract:
1. A flow measuring device adapted to be attached to a flow passage, the flow measuring device comprising: a flow rate detecting part that is configured to detect a flow rate of air flowing through the passage and to output a flow voltage signal, which is a voltage in accordance with the flow rate; an analog/digital conversion part that is configured to convert the flow voltage signal from the flow rate detecting part into digital data, which is flow digital data; a signal processing part that is configured to perform calculation processing upon the flow digital data, which includes averaging of a predetermined number of consecutive pieces of the flow digital data, and to output the averaged flow digital data as a flow rate signal, wherein: a reference voltage generating art that is configured to output a plurality of reference voltage signals used for correction processing of the flow voltage signal; and a multiplexer that is configured to sequentially select the plurality of reference voltage signals and the flow voltage signal in a predetermined order, wherein: