Patent ID: 7454950
Filing Date: 2008-11-25
Classification: G01N,Y02A

Abstract:
1. An exhaust gas analyzer comprising: a main flow path to which exhaust gas discharged from an internal combustion engine is continuously introduced in a chronological order and which acts as a common bypath to pass at least a portion of the exhaust gas; at least one sub-flow path furcated from the main flow path and arranged in parallel to the main flow path; plural kinds of analyzers some of which are mounted on the main flow path and others of which are mounted on the at least one sub-flow path, and that measure concentration of each of multiple components in the exhaust gas in a chronological order, the plural kinds of analyzers including an infrared gas analyzer mounted on the main flow path to measure concentrations of CO, CO an information processing unit having a memory for storing a difference of time between times until the exhaust gas reaches each analyzer; an actual measurement value obtaining part that obtains an actual measurement value of the concentration for each measured component in the exhaust gas discharged at the same time by obtaining an actual measurement value of the concentration for each measured component in the exhaust gas that reaches one of the plural kinds of analyzers at a latest time and another actual measurement value of the concentration for each measured component in the exhaust gas that reaches another one of the plural kinds of analyzers at a time prior to the latest time by a deviance of time when the actual measurement value of the concentration for each measured component in the exhaust gas is obtained from the one of the plural kinds of analyzers; and a correction part that corrects a deviance from a true value generated to an actual measurement value due to a mutual influence of the measured components based on at least one actual measurement value.