Study On Cold Start Performance Of Heavy Duty Diesel Engine

As the most effective thermodynamic engine,the diesel engine is widely used in various fields of national economy and military equipment.For diesel engine the ability of cold starting is one,of the most important performance targets.Especially,the cold starting ability of diesel engine for special vehicles(such as army vehicles,fire engines and so on)is required more strictly,such as for army vehicles,engines starting in-41 are necessary℃.So the ability of diesel engines’ cold starting must be solved.Domestic and foreign specialists have made deeply research on the subject.The results show that diesel engines’ starting must be based on three conditions: There exists curtain amount of blended ignitable gas made up of fuel and air;The ignitable gas must arrive at certain temperature;The firing temperature must be kept for certain time.Combining much experience on the cold start test in heavy duty engines,vehicles by the project of Weichai Power Co.,Ltd,the paper expound the factors and improvements which are effective.Base on INCA calibration software which is produced by ETAS,research the process of cold start on the engines which use the Bosch’s high pressure common rail fuel system,including cold start influence elements such as atmosphere pressur,start torque,batteries,starter,grid heater,optimized the start system like starter and etc.The work laid the important theoretical basis for the calibration of cold start,ECU calibration experience has been accumulated.