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Sliding mode observers for automotiv...
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Chen, De-Shiou.
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Sliding mode observers for automotive alternator.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Sliding mode observers for automotive alternator./
作者:
Chen, De-Shiou.
出版者:
Ann Arbor : ProQuest Dissertations & Theses, : 1998,
面頁冊數:
160 p.
附註:
Source: Dissertation Abstracts International, Volume: 59-08, Section: B, page: 4318.
Contained By:
Dissertation Abstracts International59-08B.
標題:
Electrical engineering. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9900812
ISBN:
9780591977189
Sliding mode observers for automotive alternator.
Chen, De-Shiou.
Sliding mode observers for automotive alternator.
- Ann Arbor : ProQuest Dissertations & Theses, 1998 - 160 p.
Source: Dissertation Abstracts International, Volume: 59-08, Section: B, page: 4318.
Thesis (Ph.D.)--The Ohio State University, 1998.
Estimator development for synchronous rectification of the automotive alternator is a desirable approach for estimating alternator's back electromotive forces (EMFs) without a direct mechanical sensor of the rotor position. Recent theoretical studies show that estimation of the back EMF may be observed based on system's phase current model by sensing electrical variables (AC phase currents and DC bus voltage) of the synchronous rectifier. Observer design of the back EMF estimation has been developed for constant engine speed.
ISBN: 9780591977189Subjects--Topical Terms:
649834
Electrical engineering.
Sliding mode observers for automotive alternator.
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Estimator development for synchronous rectification of the automotive alternator is a desirable approach for estimating alternator's back electromotive forces (EMFs) without a direct mechanical sensor of the rotor position. Recent theoretical studies show that estimation of the back EMF may be observed based on system's phase current model by sensing electrical variables (AC phase currents and DC bus voltage) of the synchronous rectifier. Observer design of the back EMF estimation has been developed for constant engine speed.
520
$a
In this work, we are interested in nonlinear observer design of the back EMF estimation for the real case of variable engine speed. Initial back EMF estimate can be obtained from a first-order sliding mode observer (SMO) based on the phase current model. A fourth-order nonlinear asymptotic observer (NAO), complemented by the dynamics of the back EMF with time-varying frequency and amplitude, is then incorporated into the observer design for chattering reduction. Since the cost of required phase current sensors may be prohibitive, the most applicable approach in real implementation by measuring DC current of the synchronous rectifier is carried out in the dissertation. It is shown that the DC link current consists of sequential "windows" with partial information of the phase currents, hence, the cascaded NAO is responsible not only for the purpose of chattering reduction but also for necessarily accomplishing the process of estimation. Stability analyses of the proposed estimators are considered for most linear and time-varying cases. The stability of the NAO without speed information is substantiated by both numerical and experimental results.
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Prospective estimation algorithms for the case of battery current measurements are investigated. Theoretical study indicates that the convergence of the proposed LAO may be provided by high gain inputs. Since the order of the LAO/NAO for the battery current case is one order higher than that of the link current measurements, it is hard to find moderate values of the input gains for the real-time sampled-data systems. Technical difficulties in implementation of such high order discrete-time nonlinear estimators have been discussed. Directions of further investigations have been provided.
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