基于轻型柴油车的柴油机氧化催化器入口温度升温特性及策略研究

GU Han1 , WANG Jian1 ,XU Xin1 , ZHANG Duojun2 ,LIU Sheng"
(1. School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China； 2. Wuxi Wabertec Automobile Technology Co., Ltd., Wuxi 214000, China)
Abstract: Three typical operating conditions of high, medium and low loads were selected to
experimentally investigate the effects of intake throttle and fuel injection strategies on the combustion process, emissions, fuel economy and diesel oxidation catalyst(DOC) inlet temperature of a light-duty diesel engine, obtaining a heating strategy of the DOC inlet temperature at all operating conditions. The results showedthattheintakeairflowdeclinedwiththedecreaseoftheopeningoftheintakethro tlevalve$which had a significant efect on the in-cylinder working process：decreased compression pressure$delayed combustion start timing, reduced maximum combustion pressure and decreased cyclic indicated work. HC emission was suppressed and other emissions were deteriorated. The DOC inlet temperature was e fectively increased$andthelightertheload$themoresignificantthetemperaturerise.Atestoffuelinjectionpatern coupled with intake thro tle wasconducted.Thetestresultsshow that with the delay of the mainfuel injection timing$the ignition delay is shortened$the weight of the post combustion increases and the DOC inlet temperature rises slightly. The DOC inlet temperature is raised by increasing the fuel quantity of the closepost-injection.The DOCinlettemperaturerisesfirstandthen drops withretardingtheclosepostinjectiontiming.Thereisanoptimumclosepost-injectiontiming.Accordingtothedistributionoftheengine exhausttemperatureinthewholeoperationrange$thestrategyofcontrolingtheDOCinlettemperatureis proposed.
顾 王 X1, 建1，许 鑫】，张多军2,刘胜吉1 (1.江苏大学汽车与交通工程学院，镇江212013 ；2.无锡伟博汽车科技有限公司，无锡214000)
Research on Inlet Temperature Rise Characteristics of Diesel Oxidation Catalyst and its Strategy for Light-Duty Diesel Vehicles
摘要：选取了高、中、低负荷的3个典型工况，研究了进气节流及喷油策略对柴油机缸内 燃烧过程、排放性、经济性及柴油机催化氧化器(diesel oxidation catalyst, DOC)入口温度的影 响，得到全工况区域的DOC入口温度的升温策略。试验结果表明：随进气节流阀开度减小， 进气流量降低，压缩压力下降，燃烧始点滞后，最高燃烧压力下降，循环指示功降低；HC排放 得到抑制，其他排放恶化；DOC入口温度得到有效提升，负荷越小，温升效果越显著。喷油规 律耦合进气节流发现，主喷提前角的推迟使得滞燃期缩短、后燃加重，DOC入口温度小幅度提 升；近后喷油量增加可提高DOC入口温度，推迟近后喷，DOC入口温度先增大后 降低，存在最
收稿日期：2018-09-16
修回日期：2018-10-29
基金项目：江苏省高校优势学科建设工程资助项目(苏证办发)015*)江苏重点研发计划项目(BE201518)
Fund Project： Subsidized Projects of Universities in Jiangsu Province(2015) ;Key Research and Development Program in Jiangsu Province(BE201518)
第40卷第3期 2019年6月
内燃机工程
Chinese Internal Combustion Engine Engineering
文章编号：1000 — 0925(2019) 03 — 0102 — 08
Βιβλιοθήκη Baidu
Vol. 40 No. 3 June. 2019
400044
基于轻型柴油车的柴油机氧化催化器入口 温度升温特性及策略研究