A Study on Knocking Analysis Simulator Based on CRDI Engine ECU
In order to meet the recently enhanced emission standards at home and abroad by applying CRDI (Common Rail Direct Injection) diesel engines to industrial engines, this study developed the CRDI ECU control algorithm that users can adjust fuel injection timing and amount. This study aimed to improve fuel economy and to reduce harmful gas emissions effectively by developing the algorithm distinguishing diesel knock and long tooth with the use of CKP and CMP sensors among the input factors of CRDI engine control ECU, and by adjusting engine balance through the development of algorithm that can determine when adjusting the fuel injection timing and amount, and distinguish abnormalities of engines.
Vehicle Diesel Engines
The diesel engine came to be used as a car engine relatively late after the first demonstration of its operation in 1897. The introduction of the first mass produced diesel passenger cars in 1936 finally enabled diesel engines to vie with the dominant gasoline engines of the day as an alternative drive concept in this segment too.
Evaluation of buckling load and dynamic performance of steel shear wall retrofitted with strips made of shape memory alloy
One of the most imperfections of the steel shear wall is out of plane displacements that cause severe damage in both structural and non-structural elements. In this paper, the effects of shape-memory alloys on steel shear walls are investigated. First, a numerical analysis using the finite element method in ABAQUS software has been carried out according to an experimental test. The results of the numerical analysis have been verified with experimental results. Next, shape-memory alloy fibers have been added vertically and horizontally to various parts of the steel shear wall. The results show that retrofitting with the shape-memory alloy reduces the out-of-plane displacement of the steel shear wall under both cyclic and seismic loadings. Besides, the buckling load in the steel shear wall increases when it is retrofitted with the shape-memory alloy. Also, the total out-of-plane movement (accumulated absolute displacements) of the steel shear wall and non-structural damage are controlled by the characteristic of a shape-memory alloy material called “super-elastic”.