VEHICLE-MOUNTED EXHAUST GAS ANALYZER, EXHAUST GAS ANALYSIS METHOD, AND PROGRAM FOR EXHAUST GAS ANALYZER

To provide a vehicle-mounted exhaust gas analyzer that can correct the influence of atmospheric pressure on a delay time of concentration more accurately than before, and can reduce an error in a measurement result.SOLUTION: A vehicle-mounted exhaust gas analyzer comprises: a concentration acquisition unit 2 that acquires concentration data in which the concentration of a target gas component and the time when the concentration is measured are paired; a flow rate acquisition unit 3 that acquires flow rate data in which the flow rate of exhaust gas being sampled, or the flow rate of exhaust gas being sampled, or the flow rate of the target gas component and the time when the flow rate is measured are paired; an atmospheric pressure related value acquisition unit 4 that acquires the atmospheric pressure in a place where a vehicle is present or an atmospheric pressure related value being a pressure correlated with the atmospheric pressure; a delay data storage unit 5 that stores delay data indicating the relationship between a delay time of the concentration relative to the flow rate and the atmospheric pressure related value; and a response correction unit 6 that determines the delay time of the concentration relative to the flow rate based on the delay data and the acquired atmospheric pressure related value, and corrects time in the concentration data based on the determined delay time.SELECTED DRAWING: Figure 2 【課題】大気圧による濃度の遅れ時間への影響を従来よりも精度よく補正し、測定結果の誤差を低減できる車両搭載型の排ガス分析装置を提供する。【解決手段】対象ガス成分の濃度と、その濃度が測定された時刻が対となった濃度データを取得する濃度取得部２と、サンプリングされている排ガスの流量、又は、サンプリングされている排ガスの流量、又は、対象ガス成分の流量と、その流量が測定された時刻が対となった流量データを取得する流量取得部３と、前記車両が存在する場所の大気圧又は当該大気圧に相関する圧力である大気圧関連値を取得する大気圧関連値取得部４と、流量に対する濃度の遅れ時間と、大気圧関連値との間の関係を示す遅れデータを記憶する遅れデータ記憶部５と、前記遅れデータと、取得された大気圧関連値とに基づいて、流量に対する濃度の遅れ時間を決定し、決定された遅れ時間に基づいて前記濃度データにおける時刻を補正する応答補正部６と、を備えた。【選択図】図２