SYSTEM FOR ENDURANCE TEST OF GAS SENSOR

• Main Authors: WATANABE YUSUKE, SEKIYA TAKAYUKI
• Format: Patent
• Language: English; Japanese
• Published: 07.10.2021
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

To provide a system capable of performing an endurance test of a gas sensor more efficiently than before.SOLUTION: A system for an endurance test of a gas sensor comprises: an analyzer that analyzes an analysis object sampled from near a sensor mounted position in atmosphere gas supply piping; supply means that can sequentially supply evaluation gases having known concentrations from a position closer to an engine than the sensor mounted position in the piping; and evaluation means that evaluates the deterioration rate of the gas sensor on the basis of NOx concentration values respectively outputted from the gas sensor and the gas analyzer. The evaluation gas supply means supplies evaluation gases to an exhaust passage at least at the start and end of the test while blocking atmosphere gas supply. The evaluation means calculates a predetermined evaluation index value indicating the deterioration rate of the gas sensor on the basis of output values of the gas sensor and the gas analyzer, and evaluates the deterioration rate of the gas sensor on the basis of a change in the evaluation index value using the evaluation index value at the start of the test as a reference.SELECTED DRAWING: Figure 2 【課題】従来よりも効率的にガスセンサの耐久試験を行えるシステムを提供する。【解決手段】当該システムが、雰囲気ガス供給配管のセンサ取付位置近傍から分析対象をサンプリングして分析する分析計と、当該配管においてセンサ取付位置よりもエンジン側から、濃度既知の評価用ガスを順次に供給可能な供給手段と、ガスセンサとガス分析計から出力されるＮＯｘ濃度値に基づいてガスセンサの劣化の度合いを評価する評価手段と、を備え、評価用ガス供給手段は、試験の少なくとも開始時と終了時に、雰囲気ガスの供給を遮断した状態で評価用ガスを排気経路に供給し、評価手段は、ガスセンサにおける劣化の度合いを示す所定の評価指標値をガスセンサとガス分析計の出力値に基づいて算出し、試験開始時における評価指標値を基準としたときの評価指標値濃度一致度の変化に基づいて、ガスセンサにおける劣化の度合いを評価する、ようにした。【選択図】図２