A NEW ELECTROMAGNETIC VALVE TRAIN WITH PM/EM ACTUATOR IN SI ENGINES

2013 ◽  
Vol 37 (3) ◽  
pp. 787-796 ◽  
Author(s):  
Yaojung Shiao ◽  
Ly Vinh Dat
Keyword(s):  
Energy Consumption ◽  
Permanent Magnet ◽  
Optimal Parameter ◽  
Special Structure ◽  
Valve Train ◽  
Electromagnetic Valve ◽  
Electromagnetic Coil ◽  
Si Engines ◽  
Simulation Results ◽  
Actuator Control

This paper proposes a new electromagnetic valve train (EMV), which uses hybrid permanent magnet and electromagnetic coil (PM/EM). The new EMV is characterized by a special structure, simple actuator as well as optimal parameter designs. This EMV brings many benefits, such as valve dynamic, actuator control, and low operation energy consumption, etc. The simulation results show that this EMV achieves a 15% volume reduction and a 20% enhancement in holding force by special armature design. Additionally, the estimated energy consumption of EMV operation for the proposed EMV indicates that this EMV has the lowest operating energy compared with other EMVs.

An Optimal Design for New Electromagnetic Valve in Camless Engines

2013 ◽  
Vol 479-480 ◽  
pp. 360-364
Author(s):  
Ly Vinh Dat ◽  
Yao Jung Shiao ◽  
Thanh Phuc Le
Keyword(s):  
Finite Element ◽  
Maximum Speed ◽  
Electromagnetic Valve ◽  
Electromagnetic Coil ◽  
Camless Engines ◽  
Si Engines ◽  
Space Limit ◽  
Dimension Space ◽  
Actuator Control ◽  
Hybrid Actuator

Some previous studies have demonstrated that electromagnetic valve (EMV), which uses permanent magnet and electromagnetic coil (PM/EM) hybrid actuator, has some benefits about actuator control, energy consumption, time response compared with conventional EMVs. In this paper, a new EMV with PM/EM actuator, which significantly differs from existing EMVs, has been proposed. The EMV design has been examined and analyzed by finite element. The results conclude that the EMV satisfies the requirement of dimension space limit. Moreover, the optimal EMV design meets the requirements of transition time and holding force. The holding force can reach about 719 N and drop 42.22% for valve releasing if desired current is supplied to the coils. Therefore, the EMV can fully control the closed and open of valve timings at maximum speed in SI engines.

Energy consumption investigation of electromagnetic valve train at gas pressure conditions

2019 ◽  
Vol 146 ◽  
pp. 768-774 ◽  
Author(s):  
Xinyu Fan ◽  
Siqin Chang ◽  
Jiayu Lu ◽  
Liang Liu ◽  
Shouguang Yao ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Gas Pressure ◽  
Valve Train ◽  
Electromagnetic Valve

Dynamics of New Electromagnetic Valve in Camless Engines

2013 ◽  
Vol 284-287 ◽  
pp. 2044-2048
Author(s):  
Ly Vinh Dat ◽  
Yao Jung Shiao ◽  
Ku Hsiao Tsou
Keyword(s):  
Flow Resistance ◽  
Gas Flow ◽  
Dynamic Models ◽  
Control Valve ◽  
Electromagnetic Valve ◽  
Electromagnetic Coil ◽  
Camless Engines ◽  
Si Engines ◽  
Valve Dynamics ◽  
Engine Start

Conventional electromagnetic valvetrain (EMV) usually uses double E-coils to control valve timings for engines. This kind of EMV needs large energy to reset valve at engine start state and requires energy to hold valve at opening or closing position. Therefore, it consumes large amount of energy. In this study, an EMV system that uses hybrid permanent magnet and electromagnetic coil together is proposed. The use of EMV in SI engines allows valve timings to be variably controlled without camshaft. Dynamic models for the new EMV have been built to simulate and analyze valve dynamics in this study. Effects of gas flow resistance on valve surface and the damping coefficient are also discussed. Besides, actuation strategy for valve releasing is investigated. The results show that the new EMV satisfies requirements about lifting time, actuation energy, valve velocity and acceleration in SI engines.

Design for a Novel Electromagnetic Valve for Camless SI Engines

2013 ◽  
Vol 284-287 ◽  
pp. 1811-1815 ◽  
Author(s):  
Ly Vinh Dat ◽  
Yao Jung Shiao ◽  
Chin Hau Huang
Keyword(s):  
Engine Performance ◽  
Fast Response ◽  
Operating Conditions ◽  
Valve Train ◽  
Variable Valve Timing ◽  
Optimal Parameters ◽  
Electromagnetic Valve ◽  
Engine Efficiency ◽  
Si Engines ◽  
Variable Valve

Some previous studies have demonstrated that variable valve timing can effectively enhance engine performance, as well as significantly reduce fuel consumption and emission for SI engines. Use of electromagnetic valve train (EMV) in an engine allows valve timings to be variably controlled at different operating conditions. By this way, an EMV engine is superior to an engine with conventional camshaft-based valve train in improving engine efficiency. In this paper, a novel EMV, which uses permanent and electromagnet together, has been proposed. Improvements in structure, actuating method and optimal parameters for this EMV have brought many advantages about low actuating power, easy actuation and fast response, etc. The results show that this EMV achieves 15% volume reduction and 20% holding force enhancement by special armature design. With the aids of permanent magnet and valve releasing strategies, this novel EMV only needs small EMV actuating power compared with conventional EMV.

Study and design of dual stator permanent magnet machine with spoke-type configurations using phase-group concentrated-coil windings

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1381-1389
Author(s):  
Dezhi Chen ◽  
Chengwu Diao ◽  
Zhiyu Feng ◽  
Shichong Zhang ◽  
Wenliang Zhao
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Low Cost ◽  
Dynamic Performance ◽  
Torque Ripple ◽  
Permanent Magnet Machine ◽  
Torque Density ◽  
Phase Group ◽  
High Torque ◽  
Simulation Results

In this paper, a novel dual-stator permanent magnet machine (DsPmSynM) with low cost and high torque density is designed. The winding part of the DsPmSynM adopts phase-group concentrated-coil windings, and the permanent magnets are arranged by spoke-type. Firstly, the winding structure reduces the amount of copper at the end of the winding. Secondly, the electromagnetic torque ripple of DsPmSynM is suppressed by reducing the cogging torque. Furthermore, the dynamic performance of DsPmSynM is studied. Finally, the experimental results are compared with the simulation results.

Modeling and Design of Permanent Magnet Vibration-to-Electrical Power Generator’s Induction Coil

2012 ◽  
Vol 588-589 ◽  
pp. 614-617
Author(s):  
Zhi Hua Wang ◽  
Mei Ling Li ◽  
Jian Zhang ◽  
Li Wang ◽  
Yong Xu
Keyword(s):  
Permanent Magnet ◽  
Electrical Power ◽  
Induction Coil ◽  
Test Results ◽  
Coil Design ◽  
Sinusoidal Vibration ◽  
Electrical Generator ◽  
Simulation Results ◽  
Peak Value

The Equivalent Turn Number of Coil (ETNC) is proposed for induction coil design. Simulation results show that the vibrationonthe induction coil’s structure. The optimized coil is composed by two symmetry parts on the condition of sinusoidal vibration. The effective value of output EMF of optimized coil increases 51.39% than uniform coil’s. In the experiment, the optimized and uniform coils are fabricated with 600 turns and comparatively studied in the same vibration-to-electrical generator. The test results show that the peak-to-peak value and effective value of output EMF of the optimized coil can increase up to 52.59% and 48.76%, respectively, compared with the uniform coil.

scholarly journals Maximization of Energy Efficiency in Wireless ad hoc and Sensor Networks With SERENA

2009 ◽  
Vol 5 (1) ◽  
pp. 33-52 ◽  
Author(s):  
Saoucene Mahfoudh ◽  
Pascale Minet
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Sensor Networks ◽  
Ad Hoc ◽  
Idle State ◽  
Time Simulation ◽  
Simulation Results ◽  
Remaining Time ◽  
Slot Reuse ◽  
Node Energy

In wireless ad hoc and sensor networks, an analysis of the node energy consumption distribution shows that the largest part is due to the time spent in the idle state. This result is at the origin of SERENA, an algorithm to SchEdule RoutEr Nodes Activity. SERENA allows router nodes to sleep, while ensuring end-to-end communication in the wireless network. It is a localized and decentralized algorithm assigning time slots to nodes. Any node stays awake only during its slot and the slots assigned to its neighbors, it sleeps the remaining time. Simulation results show that SERENA enables us to maximize network lifetime while increasing the number of user messages delivered. SERENA is based on a two-hop coloring algorithm, whose complexity in terms of colors and rounds is evaluated. We then quantify the slot reuse. Finally, we show how SERENA improves the node energy consumption distribution and maximizes the energy efficiency of wireless ad hoc and sensor networks. We compare SERENA with classical TDMA and optimized variants such as USAP in wireless ad hoc and sensor networks.

Design and analysis of skip fire valve strategies based on electromagnetic valve train

2018 ◽  
Vol 129 ◽  
pp. 833-840 ◽  
Author(s):  
Maoyang Hu ◽  
Siqin Chang ◽  
Liang Liu ◽  
Yaxuan Xu ◽  
Jiangtao Xu
Keyword(s):  
Valve Train ◽  
Electromagnetic Valve

scholarly journals Improvement in Torque Density by Ferrofluid Injection into Magnet Tolerance of Interior Permanent Magnet Synchronous Motor

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1736
Author(s):  
In-Jun Yang ◽  
Si-Woo Song ◽  
Dong-Ho Kim ◽  
Kwang-Soo Kim ◽  
Won-Ho Kim
Keyword(s):  
Permanent Magnet ◽  
Electromotive Force ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Element Analysis ◽  
Final Model ◽  
Torque Density ◽  
Leakage Path ◽  
Interior Permanent Magnet ◽  
Simulation Results

In an interior permanent magnet synchronous motor, an adhesive such as bond is generally injected into the magnet tolerance to prevent vibration of the permanent magnet within the insertion space. In this case, a disadvantage is that the magnet tolerance does not contribute to the performance. In this paper, ferrofluid is inserted to improve the torque density, utilizing the magnet tolerance. When inserting ferrofluid into the magnet tolerance, it is important to fix the magnet because conventional adhesives are not used, and it is important that the ferrofluid does not act as a leakage path within the insertion space. In this study, a new rotor configuration using a plastic barrier that satisfies these considerations was introduced. The analysis was conducted through finite element analysis (FEA), and this technique was verified by comparing the simulation results and the experimental results through a dynamo test. It was confirmed that the no-load back electromotive force in the final model increased through ferrofluid injection.

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