Papers by Author: Feng Tsai Weng

Abstract: The method of supplying fuel for an electronic-controlled fuel injection system is calculating the required fuel amounts under various operating conditions of engine and controlling the opening and closing timing of fuel injection. After fuel injection, the effects of condensation and atomization of injected fuel as well as fuel mixing for combustion are strongly dominated by the opening timing and duration of intake valves. This can further affect the emission composition and performance for an engine. As the emission regulation is getting more stringent and the requirement for minimizing specific fuel consumption is becoming more urgent, investigating the effect of closing timing of fuel injection has turned out to be a major issue. Therefore, this paper presents a study about a series of engine tests to investigate the effect of end of injection angle on the performance and emission formation for a gasoline engine. In these tests, the values of end of injection angle are adjusted using a control software for electronic-controlled fuel injection system so that the results can be analyzed under various engine speeds and loads.

Abstract: After the automobile made an emergency brake or bumped by accident, the baby car seat will be deformed and cracked by great force, the baby car seat have became a very important topic for years. This study focuses on analyzing the state of baby car seat after receiving forces, propose the improvement of structure strength and safety factors, enhance the structural strength of baby car seat and improve collision resistance. The internal skeleton was a backbone of baby car seat structural design, this research utilized simulation that combined CAD software (Pro-E) with finite element analysis software (Ansys\Workbench) to analyze the bumping situation, the high-speed camera was also applied to record the bumping situation of baby car seat. The comparison between these two results was used to design the skeleton within safety seat in order to approach the anticipative structure strength. Therefore, structure analysis will enable baby car seat to reach a high level of collision resistance.

Abstract: In this paper, we proposed a method to fabricate a D-shaped optical fiber of Bragg surface grating filter component by D-shaped fiber polishing along with photolithography、holographic interference lithography technologies and micro-molding process. The optical fiber was side-polished until it reaches the core of fiber. The master Bragg grating was first fabricated on the positive photoresister by using the holography interference lithography, then the patterned resist was used as a mother mold to transfer the pattern onto a hard polydimethylsiloxane (hPDMS)/ polydimethylsiloxane (PDMS) mold. The gratings pattern on hPDMS/PDMS was then transferred onto the UV polymer on the surface of a D-shaped fiber using a UV replication process. The transmission spectra of the resulting gratings were measured, with test results showing the transmission dip of -17dB , and 3-dB-transmission bandwidth of 9nm.

Abstract: Thread control method can promote system performance in the main purpose of this paper control system, divide by Thread CPU raise with time stage laying computer handle efficiency raise. Thread applies to the control system of the computer, the main purpose of this paper adopts the control of Thread in its procedure of image tracking and servo control system, the characteristic of utilizing Thread to carry out in step improves image Tracking and servo error rate controlled. In the main purpose of this paper compares with single thread to Thread, Thread improves Tracking pace and stabilizes time, especially vision Tracking and servo control will have a large number of materials, take to improve the system to carry out the pace so as to law this, to reach the cost and study the purpose.

Abstract: In this paper, a practical micromachining technology was applied for the fabrication of a micro drill using electrochemical etching process. Sodium chloride solution was used as electrolyte, a tungsten carbide rods can be dissolved to some micrometers from original dimension by electrochemical etching with supersonic agitation. High-aspect-ratio of micro tungsten carbide rod was easily obtained by this process. Processing performance was investigated according to applied voltage, etching time, and electrolyte concentration. A micro drill of diameter 60 μm was processed by proposed supersonic aided electrochemical etching process.

Abstract: In this paper, the machining possibilities of silicon wafers by the EDM process are described. Micro components of silicon wafer were processed by EDM process. A fine tungsten carbide rod was machined as tool electrode for EDM process. Performance was investigated utilizing serious experiments. Micro hole was process with the fine electrode using EDM drilling. Micro slots were also processed on the surface of a silicon plate by a copper section electrode. The surface roughness of the silicon wafers in the EDM process was investigated. Array-micro-hole was machined by a tungsten carbide multi-electrode. Array micro holes on the coaxial circle were processed by a graphite-copper electrode of Dia.0.45mm. Batch production technology for economical EDM machining of micro holes were proposed.