| 摘要 |
PROBLEM TO BE SOLVED: To obtain mass emission measuring technique enabling the correction of time because the flow rate of exhaust gas is also changed corresponding to a change in an operation state but it is necessary to ensure the simultaneity of a measured value of an exhaust gas flow rate and a gas analyzing value, when the discharge amount of a component is calculated from the direct measurement of the flow rate and component concentration of exhaust gas. SOLUTION: In an apparatus constituted so that the mass emission of the exhaust gas of a car is continuously measured at the outlet of an exhaust pipe by using a high speed response exhaust gas flowmeter 10 and a high speed response gas analyzer 16 and converted to mass concentration and a mass flow rate to operate momentary mass emission to calculate the same, an arithmetic circuit which automatically corrects the time related to the compositional change of the exhaust gas on the basis of operational expression: τ=a+273C/[q(273+t)] or calculation similar to this expression by using the measured value (q) of the flow rate of the exhaust gas converted to a standard state, the measured value (t) of the temperature of the exhaust gas, the definite constant C corresponding to the dead volume of an exhaust system, and the delay time (a) fixative to an exhaust gas analyzing system with respect to the synthetic delay time τ of the gas analyzed value to a flow rate measured value, is provided to ensure the simultaneity of the change of the flow rate and the compositional change of the gas in the measurement of mass emission. |
