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Zhao Y.,Tsinghua University | Hu J.,Tsinghua University | Chen Z.,Hangzhou Yinlun Technology And Engineering Co. | Shuai S.,Tsinghua University | And 2 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2011

An experimental study on the effects of mixer on the performance of urea-selective catalytic reduction (SCR) system in vehicle diesel engine is conducted. The test results indicate that the exhaust flow rate and the diameter of exhaust pipe have significant influence on pressure loss while the effect of exhaust temperature is relatively less. Adding mixer on the engine not only improve the mixing of reductant with exhaust gas, but also make the distribution of reductant more even, thus increasing the conversion rate of NOx by up to 10%. Source


Zhao Y.-G.,Tsinghua University | Hu J.,Tsinghua University | Hua L.,Tsinghua University | Chen Z.,Hangzhou Yinlun Technology And Engineering Co. | And 2 more authors.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2011

The influences of exhaust temperature and space velocity on the catalytic reduction reaction rate, NOx conversion efficiency and ammonia storage and leakage were investigated on engine test bench. The process of ammonia storage and release, and the relationship between ammonia storage amount and NOx conversion efficiency were analyzed. Experimental results show that the temperature has a great influence on the catalytic reduction reaction rate. The reaction rate at 400°C is as 17 times fast as at 200°C while the space velocity is kept at 20000/h. But the space velocity affects the reaction rate hardly. The reaction rates are almost the same when the space velocity varies from 20000/h to 50000/h at the same temperature. An increase of the space velocity causes an early ammonia leakage which limits the further increase of NOx conversion efficiency. The temperature affects the ammonia storage capacity more strongly than the space velocity. The NOx conversion efficiency is linear basically to the ammonia storage amount at the temperatures of 200°C and 240°C, when temperature exceeds 320°C, the effect lowers. Source


Yan W.-G.,Zhejiang University | Yu X.-L.,Zhejiang University | Lu G.-D.,Hangzhou Yinlun Technology And Engineering Co. | Zhou J.-W.,Hangzhou Yinlun Technology And Engineering Co.
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | Year: 2011

A heat pipe heat exchanger was constructed for cooling hot compressed airflow in order to analyze the feasibility in the vehicle heat exchanger by using water as the working fluid. Experimental studies on the heat transfer and pressure drop characteristics were performed on the wind tunnel test rig. The characteristics of heat transfer and pressure drop for different inlet air velocities, temperature differences and hot compressed air mass flow were analyzed and compared with theoretical results. Results show that the heat pipe heat exchanger has effective heat rejection performance and can satisfy the heat rejection requirement of highly turbocharged engine in a certain range. The experimental results agreed well with the theoretical results. Source


Hu J.,Tsinghua University | Zhao Y.-G.,Tsinghua University | Chen T.,Hangzhou Yinlun Technology And Engineering Co. | Chen Z.,Hangzhou Yinlun Technology And Engineering Co. | And 3 more authors.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2011

Aimed at the urea selective catalytic reduction (SCR) after-treatment system of heavy duty diesel engine, the urea dosing control unit (DCU) was developed including hardware platform and control strategy. The electronic control unit used 16 bit high speed MCU, featuring compact structure and reliable operation. The control strategy based on the engine MAPs and steady and transient modification to actual operation conditions was adopted in the DCU. The urea-SCR after-treatment system of diesel engine equipped with the DCU fulfills the China stage IV and more stringent emission regulations for heavy duty diesel engine. Source


Yan W.,Zhejiang University | Yan W.,Hangzhou Yinlun Technology And Engineering Co. | Yu X.,Zhejiang University | Lu G.,Hangzhou Yinlun Technology And Engineering Co.
Huagong Xuebao/CIESC Journal | Year: 2011

Models for heat transfer performance and thermal resistance of heat pipe intercooler were established based on BP neural network. The heat transfer performance and thermal resistance were predicted by means of the Levenberg Marquardt training algorithm. The prediction results were in good agreement with the experimental results. For the network model of heat transfer, the maximum relative error is 8.0% and the average relative error is 3.5%. For the network model of thermal resistance, the maximum relative error is 13.1% and the average relative error is 5.1%. Thus the prediction model of the heat pipe intercooler can be used for engineering design. The structural parameters were optimized with the BP neural network model and the optimal design parameters were obtained. The study will be the foundation for the development and application of heat pipe intercooler. © All Rights Reserved. Source

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