Yuan X.,Jilin University |
Gao Y.,Jilin University |
Wang X.,WEICHAI Power Co.
International Journal of Engine Research | Year: 2016
To meet the future emission legislations, selective catalytic reduction aftertreatment system becomes a leading aftertreatment technique for heavy-duty diesel engines. In this article, a two-cell selective catalytic reduction model is first calibrated and verified on an experimental test bench. In order to regulate the ammonia coverage ratio in a proper range, an ammonia storage control is proposed based on the selective catalytic reduction model. The problem of NH3 slip during temperature rise is discussed and a corresponding perturbation injection control is proposed to buffer the sudden change in selective catalytic reduction ammonia storage capability. The NH3 slip control performance of the proposed strategy is experimentally validated in European Transient Cycle. © Institution of Mechanical Engineers. Source
Wang D.,Taiyuan University of Technology |
Zhang J.,Taiyuan University of Technology |
Xu J.,WEICHAI Power Co. |
Zhao Z.,Taiyuan Iron and Steel Group Ltd |
And 2 more authors.
Journal of Magnesium and Alloys | Year: 2014
Mg97- xZn1Y2Alx alloys with long-period stacking ordered (LPSO) structures were prepared by conventional casting method. The optical microscopy (OM), X-ray diffraction (XRD) and the scanning electron microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) were used to analyze the microstructure of the alloys with different compositions. Immersion test and electrochemical measurement were used to evaluate the corrosion behavior of the alloys at room temperature, and the corrosive medium is 3.5% NaCl aqueous solution. The results showed that, with the increasing aluminum (Al) addition, except α-Mg and LPSO phases, new phases also emerged on the grain boundaries. At the same time, the zigzag part of LPSO phases disappeared, and the boundaries between LPSO phases and α-Mg became smooth. Furthermore, the addition of Al to Mg-Zn-Y alloys could hinder the activity of cathodic hydrogen evolution reaction and improve the uniformity and compactness of the protective surface film, thus, enhanced the corrosion resistance of Mg-Zn-Y alloys. © 2014 National Engineering Research Center for Magnesium Alloys of China, Chongqing University. Source
Weichai Power Co. | Date: 2011-04-19
Weichai Power Co. | Date: 2014-09-02
Industrial oil; motor oil; lubricating oil; diesel oil; fuel; industrial wax; lamp wicks; dust removing preparations; electrical energy; mineral fuel. Fuel conversion apparatus for internal combustion engines; generators of electricity; engines, other than for land vehicles; crank shafts; pumps (machines); agricultural machines; net hauling machines (fishing); extractors for mines; excavators; handling apparatus for loading and unloading. Vehicles for locomotion by land, air, water or rail; trucks; engines for land vehicles; bicycles; automobile tires; aerial conveyors; hydroplanes; yachts; tilt trucks; brake shoes for vehicles. Building construction supervision; construction; mining extraction; heating equipment installation and repair; upholstering; machinery installation, maintenance and repair; motor vehicle maintenance and repair; shipbuilding; vulcanization of tires (repair); furniture restoration.
Weichai Power Co. | Date: 2011-10-09
An apparatus (