Patent ID: 6176125
Filing Date: 2001-01-23
Classification: G01F,G01M

Abstract:
Exhaust gas flow rate measuring apparatus for internal combustion engines, comprising:a gas analyzer;a gas sampling passage for supplying a sample gas to the gas analyzer;an exhaust passage linked to the internal combustion engine for receiving an exhaust gas and connected to the gas sampling passage at a connection point;a trace gas introduction tube connected to the exhaust passage at an introduction point for introducing a trace gas at an introduction rate;a hollow pole connected to the trace gas introduction tube and installed in the exhaust passage, the pole for receiving the trace gas including a hole for spouting the trace gas into the exhaust gas, the pole having a cross-sectional profile of a polygon in order to create a large turbulence;a trace gas analyzer located within the gas sampling passage for measuring a concentration of the trace gas; anda capillary for connecting the trace gas analyzer to the gas sampling passage, the capillary having an inner diameter;the concentration of the trace gas being measured by the trace gas analyzer when the trace gas is introduced upstream of the connection point of the gas sampling passage and the exhaust passage; anda flow rate of the exhaust gas of the internal combustion engine being measured based on the concentration of the trace gas and a rate at which the trace gas is introduced.