NOx CONCENTRATION MEASUREMENT SYSTEM

• Main Authors: MAEDA ERIKO, KIMATA TAKEHITO, TOUDOU YUUSUKE, MIZUTANI KEIGO
• Format: Patent
• Language: Chinese; English
• Published: 09.07.2019
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

A NOx concentration measurement system is provided and has a NOx sensor (2), a detection section (3), a NH3 concentration estimation section (5) and a calculation section (7). The NOx sensor (2) measures a sum concentration c4 of a concentration of NOx (a concentration c1 of combustion derived NOx) in exhaust gas g, and a concentration of NO (concentration c3 of derived NO which has been derived from NH3) oxidized from NH3. The calculation section (7) calculates the concentration c3 of derived NO by using a concentration c2 of NH3 contained in outside exhaust gas which is present around the NOx sensor, not inside of the NOx sensor, and at least one of an air fuel ratio A/F, a concentration of O2 and a concentration of H2O. The concentration c1 of the NOx is calculated based on the sum concentration c4 and the concentration c3 of derived NO. 本发明提供一种NOx浓度测定系统，其具备NOx传感器(2)、检测机构(3)、NH浓度估计机构(5)和计算机构(7)。NOx传感器(2)对含在排气g中的NOx的浓度(本来NOx浓度c)和NH氧化而产生的NO的浓度(源于NH的NO浓度c)的合计浓度c进行测定。计算机构(7)根据空燃比A/F、O浓度及HO浓度中的至少1个和传感器外NH浓度c计算源