Shi L.,Shanghai JiaoTong University |
Feng L.-L.,Pan Asia Technical Automotive Center Co. |
Zhou Y.-M.,Hudong Heavy Machinery Co. |
Deng K.-Y.,Shanghai JiaoTong University
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2012
In order to solve the problem operating in low load range for two-stroke low-speed diesel engine, blowers were equipped to achieve high scavenge pressure. The scavenging model and blowers switching points were studied on 7K90MC-C two-stroke low-speed diesel engine. The engine model and blower model were developed. The simulation results were verified by the experimental results. The switching of blower was studied further. Results show that in order to reduce engine thermal load, the blowers should be cut-off near 41% load point in load increasing process and opened near 35% load point in load decreasing process.
Liu B.,Shanghai JiaoTong University |
Liu B.,Hudong Heavy Machinery Co. |
Li H.-L.,Shanghai JiaoTong University |
Hu Z.-L.,Shanghai JiaoTong University |
And 2 more authors.
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | Year: 2012
Experimental study during load transit was conducted on a regulated two stage turbocharging (R2S) diesel engine. Transient test system of diesel engine with R2S was built. Regulating maps of R2S bypass valves were analyzed through the comprehensive steady-state experiment. Experimental method of load transit process was determined based on the steady-state regulating maps of bypass valves. Load transit performance test at same speed was conducted under three speed lines. Experimental results showed that the turbine bypass valve should be closed at low speed and high load. At low load, bypass valve was also closed to avoid the slowly rising of boost pressure and poor emissions performance. One modified regulating map was proposed to improve the response of turbocharging system of diesel engine. Meanwhile, smoke emission was improved.
Hu Z.,Shanghai JiaoTong University |
Gui Y.,Hudong Heavy Machinery Co. |
Xu M.,Shanghai JiaoTong University |
Deng K.,Shanghai JiaoTong University |
And 2 more authors.
Journal of Mechanical Science and Technology | Year: 2015
A continuous variable valve lift (VVL) mechanism for a diesel engine is proposed in this research. The hydraulic mechanism, which consists of a driving plunger, a driven plunger, a hydraulic cylinder, and a hydraulic oil tank, is the key part of the VVL mechanism. Simulation is conducted to study the relationship between maximum valve lift and rotation angle of driving plunger. Calculation results indicate that the maximum valve lift decreases with increasing rotation angle. A prototype was manufactured and successfully tested in a single-cylinder diesel engine. The experiments, which were conducted at different rotation angles of the driving plunger, validate the accuracy of the calculation results. The difference between experimental valve lift curve and cam lift curve is considered the result of oil leakage. Rotating the driving plunger is an effective method to regulate valve lift. Working stability of the VVL mechanism is validated through a multi-cycle operation. Experimental results indicate that the VVL mechanism is effective and reliable for realizing continuous VVL in engines. © 2015, The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.
Xiao Y.H.,Harbin Engineering University |
Zheng W.,Harbin Engineering University |
Jin Y.S.,Hudong Heavy Machinery Co. |
Tian X.N.,Harbin Engineering University
Advanced Materials Research | Year: 2014
In this paper, the model of SCR after-treatment system is established by the software MATLAB and the control strategy for the system is studied also. Based on Eley-rideal mechanism, four major chemical reactions including the adsorption of ammonia, desorption of ammonia, selective catalytic reduction and oxidation of adsorbed ammonia are selected to study the SCR control strategy. Based on the energy conservation law, the equation calculating the temperatureof the layered model is derived. Combinedwith the equations of chemical reaction process,a mathematical model of SCR catalytic converteris established.To achieve a high NOX reduction efficiencyof SCR system, thereasonable and efficacious control strategies for the micro-element models of SCR catalytic is simulated,which including the feedback control strategy based on the feed-forward controller and the PID control strategy. © (2014) Trans Tech Publications, Switzerland.
Zhang S.-W.,Jiangsu University of Science and Technology |
Ding Y.-L.,Jiangsu University of Science and Technology |
Wang G.-C.,Jiangsu University |
Yang C.-Q.,Hudong Heavy Machinery Co. |
Jia W.,Hudong Heavy Machinery Co.
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2011
Aiming at the structural features of some frame parts in marine diesel engine manufacturing enterprise, key technologies for feature information extraction, feature matching, feature reconfiguration, feature process inference and feature tool path were studied. Machining feature information was transferred in above links by using the integration method based on Standard for the Exchange of Product model data (STEP) and feature technology. On this basis, a Computer Aided Design/Computer Aided Process Planning/Computer Aided Manufacturing (CAD/CAPP/CAM) integration system of marine diesel engine frame parts was developed and validated through a case. This system was characterized by easy operation with less human intervention. It could also be extended and applied in the information integration of other types of diesel engine parts.