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为了满足未来排放法规的要求,各种可供选择的以提高废气再循环(EGR)率的EGR技术路线正受到研究人员的广泛关注,由于稳态排放在不断降低,排放试验运转循环中瞬态部分的排放峰值变得十分重要。因此,需要分析不同EGR技术路线的瞬态性能。对装有冷却式短线EGR和可变截面涡轮增压器的1,9 L轿车柴油机采用GT—Power软件进行了1维仿真分析。为了对仿真进行标定,测量了瞬态负荷,包括采用快速二氧化碳分析仪测量瞬态EGR率和气缸压力,以测取放热数据。采集了瞬态燃烧放热率的数据库进行仿真。用瞬态EGR率和进气压力作为选择某一循环正确放热率的判据。
In order to meet the requirements of future emission regulations, a variety of alternative EGR technology routes to increase the exhaust gas recirculation (EGR) rate are drawing much attention of researchers. Due to the steady reduction of steady-state emissions, transient state of emission test operation cycle Part of the emission peak becomes very important. Therefore, the transient performance of different EGR technology routes needs to be analyzed. The 1,9-liter sedan diesel engine equipped with a cooled short-term EGR and a variable-section turbocharger was subjected to a one-dimensional simulation analysis using GT-Power software. To calibrate the simulation, transient loads were measured, including transient carbon dioxide analyzer measurements of transient EGR rates and cylinder pressures to measure exothermic data. A database of transient heat release rates was collected for simulation. Transient EGR rate and intake pressure are used as the criteria for choosing the correct heat release rate for a given cycle.