Search or add a thesis

Advanced Search (Beta)
Home > Sliding Mode Framework Based Fault Tolerant Control for Air Path Actuators of a Turbocharged Diesel Engine

Sliding Mode Framework Based Fault Tolerant Control for Air Path Actuators of a Turbocharged Diesel Engine

Thesis Info

Access Option

External Link

Program

PhD

Institute

Capital University of Science & Technology

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2018

Thesis Completion Status

Completed

Subject

Control Systems

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/10893/1/Ghulam%20Murtaza_EE_2018_CUST_PRR.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727176814

Asian Research Index Whatsapp Chanel
Asian Research Index Whatsapp Chanel

Join our Whatsapp Channel to get regular updates.

Similar


Exhaust emission control, especially in case of diesel engines, is a challenging re search problem as the emission regulating authorities place stringent protocols against emissions. The air management system of a diesel engine, that is fit ted with Variable Geometry Turbocharger (VGT) and Exhaust Gas Recirculation (EGR) actuators, is among the sub-systems, whose effective control ensures that emissions are kept to minimum. Both EGR and VGT sub-systems are located in the engine exhaust channel, hence, they are strongly coupled and exposed to high temperatures, un-burnt hydrocarbons and lubricants and thus prone to faults/cho king. One way to increase tolerance against faults is to have redundancy. Diesel engines do not have high number of identical actuators to preserve satisfactory operation, but, still have prospects for enhancing the reliability of these control loops by constructing algorithms, that are capable of performing online detection, diagnosis, estimation and compensation of faults. This research investigates the possible options for development of Fault Tolerant Control (FTC) schemes for coordinated control of air management system actuators of diesel engine. The dynamic nature of a control system and real time environment of Fault Detection and Isolation (FDI) and controller re-configuration requires FTC system to be capable of detecting, identifying and accommodating the faults as swiftly as pos sible. To meet the purpose, unified and systematic design techniques need to be developed to guarantee swift integration of FDI and FTC schemes, such that, the faults are handled in an early design phase by extending the control system with additional modules, i.e., FDI module. The model used in this research is a fully validated industrial scale Mean Value Model of a diesel engine that is equipped with VGT and EGR actuators. It has eight states and three control inputs. Two types of approaches i.e., passive FTC and unified FDI and FTC with further two algorithms of each have been proposed based on the sliding mode framework. The simulation results have shown that the proposed controllers can comfortably meet strict emission regulations even in the event of system faults. Specially fault de tection, estimation and compensation capability of unified approaches give them an edge over passive schemes.
Loading...
Loading...

Similar Books

Loading...

Similar Chapters

Loading...

Similar News

Loading...

Similar Articles

Loading...

Similar Article Headings

Loading...

مولانا عنایت اﷲ فر نگی محلی

مولانا عنایت اﷲ فرنگی محلی
یہ خبر نہایت افسوس کے ساتھ سنی جائے گی کہ فرنگی محل کے ممتاز عالم مولانا عنایت اﷲ صاحب فرنگی محلی نے ۶؍ جولائی ۱۹۴۱؁ء کو دفعتہ وفات پائی، انا ﷲ و انا الیہ راجعون۔ مرحوم ابھی ۲۴، ۲۵، ۲۶ جون کو ہمارے ساتھ بھوپال میں عربی مدارس کی اصلاح کے کام میں شریک تھے، وہیں دردشکم میں مبتلا ہوئے جس کے باعث وہ کئی دن تک وہاں علیل رہے، سوء ہضم، تسلسل بول اور ضعف قلب کے عوارض ان کو پہلے سے لاحق تھے، بھوپال میں مرض کی تخفیف کے بعد وہ لکھنؤ روانہ ہوئے اور میں بھی ان ہی کی وجہ سے ان ہی کے ساتھ لکھنؤ تک آیا، لکھنؤ اسٹیشن پر پہنچ کر مرحوم نے مجھ سے کہا کہ میں آپ کی زحمتوں اور خدمتوں کا شکریہ اس لیے نہیں ادا کروں گا کہ میں آپ کو اپنے سے علیحدہ نہیں سمجھتا، یہ کہہ سن کر سلام کے بعد ہم دونوں الگ ہوگئے، یہ کون کہہ سکتا تھاکہ یہ سلام رخصت آخری سلام ہے۔
مرحوم فرنگی محل کے خانوادہ میں تنہا جامع علوم و فنون ہستی باقی رہ گئے تھے، معقولات اور منقولات پر ان کو یکساں دسترس حاصل تھی، مسائل پر وہ مبصرانہ اور ناقدانہ نظر رکھتے تھے، اردو میں تاریخ ، حدیث و رجال پر کئی رسالے لکھے تھے، مدرسہ نظامیہ کے صدر مدرس اور اچھے مدرس تھے، سیاسیات سے بھی دلچسپی رکھتے تھے، خلافت اور مسلم لیگ کے کاموں میں حصہ لیتے رہتے تھے، کل ۵۴ برس کی عمر پائی، اﷲ تعالیٰ مرحوم کو اپنی عنایتوں سے سرفراز فرمائے۔
(سید سلیمان ندوی، اگست ۱۹۴۱ء)

 

The Extent to Which Pupils Have Adopted the Values of Middle School English Book Year Three

The present study aims at determining the extent to which the values, derived from the second-generation curriculum and introduced in the third-year middle school English book, are adopted by teenagers to help them overcome their identity crisis, in Algeria. To achieve this aim, two questionnaires applied to 70 third year teenage pupils were carried out. One prior to the study with the third year English book, the other one after the study.The results of the two questionnaires were compared and showed that the values total average has increased from 16.06 in the first questionnaire to 21.33 in the second. An increase has also been noticed in the averages of the four value dimensions: national identity (from 4.76 to 6.10), national awareness (from 3.63 to 5.36), citizenship (from 4.13 to 5.31) and openness to the world (from 3.50 to 4.50). The previous results confirm that there is an improvement in the values of pupils yet the commitment to the values of « openness to the world » dimension is still weak compared to the other ones and needs further research to be improved.

Formulation and Validation of Framework to Measure Sustainable Supply Chain Performance With Regards to Lean, Agile, Resilient and Green Practices

This particular research work provided a better understanding for the practices of existing supply chain paradigms i.e., lean, agile, resilient and green which is commonly known as LARG; and how these LARG practices of Supply Chain (SC) impact the performance of SC. To measure the performance of SC three sub-factors were identified from literature i.e., operational performance, economic performance, and environmental performance. Measuring the performance of LARG practices of SC is entirely under researched area, as it has never been attempted by researcher before. To measure the performance of LARG practices of SC a framework was theorized after through literature review. The performance evaluation of LARG practices of SC provided the supervisors with better understandings about the areas where the performance of SC could be enriched. Moreover, it could also be identified that what are the areas which require special attention so that better performance could be achieved. Measurement of SC performance allowed not only the suppliers but also the retail distributors to evaluate their own performance as well as performance of their sub-contractors. Likewise, it also provided the opportunity to recognize what elements enhance the SC performance and what all factors weaken the SC performance. There should be equilibrium among the sub factors of performance i.e., operational performance, economic performance, and environmental performance. The previously available research studies relating to the topic of LARG practices of SC paradigms have been carried out independently; because there is not even a single research study available in which all four LARG paradigms of SC has been evaluated simultaneously and no effort has been made to empirically validate any of LARG paradigms. It is also worth mentioning that there is no single research study available in which impact of LARG practices of SC have been evaluated on the performance of SC having three sub factors i.e., operational performance, economic performance and environmental performance. So this is the very first study in which key performance indicators are identified and developed to form four constructs of independent variable i.e., lean, agile, resilient and green and three constructs of dependent variables i.e., operational performance, economic performance and environmental performance. Subsequently the indicators for the constructs were selected, basing upon these indicators final items were also adapted with the help of previous literature. Afterwards by using these indicators and constructs few hypotheses were suggested and basing upon these hypotheses a conceptual framework was formulated. For the empirical validation of this framework mixed methodology approach was applied in this thesis, the theorized conceptual framework was tested in two phases. In first phase the causal relationships were evaluated at the indicator to indicator level; indicators were compared for four independent and three dependent level variables with the help of five Pakistani textile industry‘s qualitative case studies. In these qualitative case studies, firstly the perception is recorded for the importance of every indicator and then subsequently actual implementation level of these indicators in the said case study industries was recorded. Consequently, the causal loop diagram technique was used to measure the causal relationship of every indicator of independent variable with every indicator of dependent variable. The results of causal loop diagram provided us the general view of causal relationships amongst indicators of depend and independent variables. The qualitative case study analysis results facilitated us to conclude that the executives involved in the textile industry SC, not only give due importance but also actually implement these LARG practices of SC and likewise to the measures of SC performance; which accordingly better revealed the impacts of these practices on the performance of SC. The results and conclusion of this exploratory type of qualitative analysis helped us to understand that how this framework could be useful for Pakistani textile industry particularly and global textile industry generally. Theorized conceptual framework was empirically validated in second phase with the help large scale quantitative analysis. This is the unique attempt in which the scale was adapted from state of the art literature review, which was not only tested for reliability but also for different kinds of validity which included, face; content; discriminant and convergent validity using SPSS 20 and AMOS 20 soft wares. The large-scale data of survey responses was obtained by using this reliable and validated instrument form Pakistani manufacturing industries and then this data was transferred to SPSS for further analysis. After carrying out initial descriptive statistics analysis, Structure Equation Modeling (SEM) was performed using AMOS-20 software, to test four main and twelve sub hypotheses. These hypotheses testing enabled us to empirically validate the theorized conceptual framework. The SEM, hypotheses testing results and goodness of fit statistics showed that there is no issue in theorizing of the conceptual framework, as well as empirically validation of the theorized conceptual framework. Empirically validated framework in third phase was also case tested where LARG framework was applied on China Pakistan Economic Corridor as a case study; for verification of the results scenario planning technique was applied.