China Engine Corporation

Taoyuan, Taiwan

China Engine Corporation

Taoyuan, Taiwan
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Chen J.-C.,National Central University | Tung P.-C.,National Central University | Huang S.-F.,Taipei Veterans General Hospital | Huang S.-F.,National Yang Ming University | And 3 more authors.
International Journal of Innovative Computing, Information and Control | Year: 2013

This study presents a method for the extraction and screening of knee joint vibroarthrographic (VAG) signals using an Empirical Mode Decomposition (EMD) technique. The proposed analysis method is based on the Hilbert Huang transform, which is a powerful tool for the analysis of non-stationary and non-linear time series and basically consists of an empirical mode decomposition method and Hilbert spectral analysis. A technique for time-frequency analysis of the extracted vibration signals is proposed with the goal of diagnosing knee joint diseases. The performance of the EMD technique is verified experimentally. The screening accuracy of the statistical pattern classification is 85.3% in Vibroarthrographic signals. The results confirm that the proposed approach is indeed feasible for the noninvasive diagnosis and monitoring of articular cartilage patholoyy. © 2013 ICIC International.


Chen J.-C.,National Central University | Tung P.-C.,National Central University | Huang S.-F.,Taipei Veterans General Hospital | Huang S.-F.,National Yang Ming University | And 2 more authors.
International Journal of Innovative Computing, Information and Control | Year: 2012

This study presents a novel method for the extraction and screening of knee joint vibroarthrographic (VAC) signals using an independent component analysis (ICA) technique. A time-frequency analysis technique of the extracted vibration signals is proposed to carry out knee joint diagnosis. The performance of the ICA technique is verified experimentally. Statistical pattern classification screening accuracy is 82.5% in VAC. The results confirm that ICA is a feasible approach for the noninvasive diagnosis and monitoring of articular cartilage pathology. © 2012 ICIC International.


Yang Y.-P.,National Taiwan University | Liu J.-J.,China Engine Corporation | Lu P.-H.,China Engine Corporation | Cheng Y.-R.,National Taiwan University | Ye D.-H.,National Taiwan University
2011 International Conference on Electrical Machines and Systems, ICEMS 2011 | Year: 2011

This paper proposes a novel design of an electromagnetic valve actuation system for internal combustion engines. This electromagnetic valve uses a hybrid magnetomotive force with a permanent magnet and electromagnet to control the variable timing and soft landing of the valve. Under the restriction of engine space and operation, the dynamics of the electromagnetic valve are modeled with an equivalent magnetic circuit, which is used to perform both sensitivity analysis and an optimal design function to satisfy multiple objectives, such as magnetic holding force, release current, and its rising time. The final design is verified and refined by finite element analysis. A prototype is fabricated and the experimental results show that the dynamical performances of the electromagnetic valve are satisfactory and may be improved by advanced feedback controls. © 2011 IEEE.


Liu J.-J.,China Engine Corporation | Lu P.-H.,China Engine Corporation | Yang Y.-P.,National Taiwan University | Ye D.-H.,National Taiwan University | Cheng Y.-R.,National Taiwan University
2011 International Conference on Electrical Machines and Systems, ICEMS 2011 | Year: 2011

This paper proposes a control strategy involving energy compensation for the soft-landing of an electromagnetic valve actuator in internal combustion engines. This axisymmetric and cylindrical actuator features a hybrid magnetomotive force with permanent magnet and electromagnet, and a secondary air gap to prevent the permanent magnet irreversibly demagnetizing. It is a straightforward theory in which the positive and negative work of an armature stroke is equalized, enabling a zero landing velocity to be achieved. The resultant of positive and negative work is a function of valve landing velocity, which depends on the release current that releases the armature from one seating position, and the landing current that attracts the armature to the opposite seating position. The magnitude and duty cycle of the release and landing currents are investigated for soft-landing via observation of armature displacement and velocity. The experimental results show that the landing velocity can be greatly reduced by adjusting the duty cycle of the landing current, and the actuating power is greatly reduced after the energy compensation control is applied. © 2011 IEEE.


Yang Y.-P.,National Taiwan University | Liu J.-J.,National Taiwan University | Liu J.-J.,China Engine Corporation | Ye D.-H.,National Taiwan University | And 2 more authors.
IEEE/ASME Transactions on Mechatronics | Year: 2013

This paper presents a multiobjective optimal design and an energy compensation control for the soft valve landing of an electromagnetic valve actuator in internal combustion engines. This axisymmetric and cylindrical actuator is used to achieve continuous and independent valve timing and lifting without mechanical cams, which features a hybrid magnetomotive force with permanent magnet (PM) and electromagnet, and a secondary air gap to prevent the PM irreversibly demagnetizing. The dynamics of the electromagnetic valve are modeled with an equivalent magnetic circuit, which is used to perform both sensitivity analysis and an optimal design function to satisfy multiple objectives, such as magnetic holding force, release current, and its rising time. The energy compensation control in which the positive and negative work of an armature stroke is equalized enables a zero landing velocity to be achieved. The experimental results from a prototype actuator show that the landing velocity can be greatly reduced by adjusting the duty cycle of the landing current, and the actuating power is greatly reduced after the energy compensation control is applied. © 1996-2012 IEEE.


Chen Q.-L.,China Engine Corporation | Liu J.-J.,China Engine Corporation | Lu P.-H.,China Engine Corporation
SAE Technical Papers | Year: 2013

A Hybrid electric vehicle saves fuel by four aspects, i.e. engine idle-stop, regenerative braking, engine downsizing, and engine load change. Saving fuel by 5-10% is achievable with optimized fuel cut-off strategy. However, emission and drivability trade-off must be carefully treated. The conventional automatic transmission requires a mechanical pump driven by the engine crankshaft offers hydraulic function, lubrication, and cooling. To stop the engine during vehicle idling, transmission fluid pressure will not be sufficiently maintained for the launch clutch in engaged status. Once the engine restarts, the engine speed profile can cause the transmission fluid pressure uncontrollable, which creates bump during vehicle take-off. In most vehicles equipped with a conventional automatic transmission (AT) as well as start-stop function, an electric oil pump is usually installed to maintain fluid pressure. However, cost and complexity increase, and the electric pump is redundant to the mechanical pump during normal driving. This paper presents a method for smoothing the change of automatic transmission fluid (ATF) pressure by utilizing the belt-driven starter-generator (BSG) using field oriented control (FOC) method and the correlation curve between AT fluid pressure and rotational speed of BSG. The proposed system reduced the numbers of changes and incremental cost due to additional start/stop technology applied to the existing vehicle design. © Copyright @2013 SAE Japan and Copyright @ 2013 SAE International.


Hu C.-W.,China Engine Corporation | Lin S.-L.,China Engine Corporation | Tang H.-C.,China Engine Corporation | Kao T.-C.,China Engine Corporation | Lu A.P.H.,China Engine Corporation
SAE Technical Papers | Year: 2013

Reducing the fuel consumption of conventional ICE vehicles are usually achieved from reducing vehicle running resistance, improving engine efficiency, save the idle energy, and recycling the waste energy. About 5-10% of fuel consumption can be saved by engine idle-stop, which strongly depends on fuel cut-off schedule before the vehicle completely stop. However, engine shut-off during vehicle coasting-down always exist strong concerns of safety and drivability issues. Fuel cut-off before vehicle completely stop creates the risk that the driver might change-of-mind (CoM). The driver could request the engine restart during engine running down period, when engine speed between 200-500rpm. With convention starter, the pinion gear is actuated simultaneously with the starter motor energizing. There will be no chance to engage the pinion gear with crankshaft gear when the engine is not still. That realizes idle-stop function activated before vehicle completely stop is unachievable by using conventional starter. Copyright © 2013 SAE International.

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