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You searched for subject:(constant speed test). Showing records 1 – 2 of 2 total matches.

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1. Baki, Cem, Mr. COMPARISON OF DRAG AREA ESTIMATION USING NATURAL COAST DOWN AND CONSTANT SPEED TEST METHODS.

Degree: MS, Mechanical and Aerospace Engineering, 2019, West Virginia University

Currently in US, more than 26 percent of the total GHG emissions comes from transportation and mostly from heavy duty vehicles. Similarly, the European Council stated that 25 percent of the emissions comes from heavy duty transportation and they expect it to be further increased in the future. However, with the new coming regulations US EPA and European Council aiming to reduce the emissions by 80 percent in US and 60 percent in EU. In order to keep track and control the emissions, both authorities published new regulations and testing methods for certifying the new vehicles. Aerodynamic testing is one of the most important part of certification since, aerodynamic drag is a major contributor of total road load acting on a vehicle which is highly related with emissions of a vehicle. Besides, simulation tools for certification such as “Vehicle Energy Consumption Calculation Tool (VECTO)” and “Greenhouse Gas Emission Model (GEM)” needs drag area ( ) as an input. Moreover, it is essential to determine the drag area correctly, therefore, emission of a vehicle, to be able to estimate the amount of total emissions from heavy duty vehicles. Two different regulatory testing methods were published by US EPA and European Council to determine the drag area ( ) for certification of heavy duty vehicles. While US regulations requires “coast-down (CD)” test, EU regulations requires “constant speed (CST)” test. The objective of this study is to compare these two different regulatory approaches with their different assumptions. In order to be able to make a comparison of these two testing methods, CD and CST performed with same tractor and trailer combination, which is a Class 8 truck for US market, in same conditions. Results yielded up to 9 percent difference between two methods. Possible cause of this difference can be listed as, the different assumptions of each testing method such as speed dependency of losses, different approaches for tire rolling resistance and some neglected or unaccounted loses. These possible reasons were also investigated individually in this study. Advisors/Committee Members: Arvind Thiruvengadam, Marc C. Besch, Marc C. Besch.

Subjects/Keywords: Coast-down; fuel consumption; constant speed test; chassis dynamometer; drag area; drag coefficient; tire rolling resistance; Navigation, Guidance, Control, and Dynamics; Other Mechanical Engineering

…16 3.4.1. Constant Speed Test Procedure… …Constant Speed Test Procedure European constant speed test procedure is defined at ANNEX VIII… …and Post-Processing Constant speed tests were performed at January 1 st 2018. The test had 2… …28 TABLE 4-1RESULTS OF VECTO – AIR DRAG FOR CONSTANT SPEED TESTING METHOD… …32 TABLE 4-4: DRAG AREA COMPARISON OF CONSTANT SPEED AND COAST DOWN METHODS… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Baki, Cem, M. (2019). COMPARISON OF DRAG AREA ESTIMATION USING NATURAL COAST DOWN AND CONSTANT SPEED TEST METHODS. (Thesis). West Virginia University. Retrieved from https://doi.org/10.33915/etd.3759 ; https://researchrepository.wvu.edu/etd/3759

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Baki, Cem, Mr. “COMPARISON OF DRAG AREA ESTIMATION USING NATURAL COAST DOWN AND CONSTANT SPEED TEST METHODS.” 2019. Thesis, West Virginia University. Accessed November 23, 2020. https://doi.org/10.33915/etd.3759 ; https://researchrepository.wvu.edu/etd/3759.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Baki, Cem, Mr. “COMPARISON OF DRAG AREA ESTIMATION USING NATURAL COAST DOWN AND CONSTANT SPEED TEST METHODS.” 2019. Web. 23 Nov 2020.

Vancouver:

Baki, Cem M. COMPARISON OF DRAG AREA ESTIMATION USING NATURAL COAST DOWN AND CONSTANT SPEED TEST METHODS. [Internet] [Thesis]. West Virginia University; 2019. [cited 2020 Nov 23]. Available from: https://doi.org/10.33915/etd.3759 ; https://researchrepository.wvu.edu/etd/3759.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Baki, Cem M. COMPARISON OF DRAG AREA ESTIMATION USING NATURAL COAST DOWN AND CONSTANT SPEED TEST METHODS. [Thesis]. West Virginia University; 2019. Available from: https://doi.org/10.33915/etd.3759 ; https://researchrepository.wvu.edu/etd/3759

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Wu, Hai. Performance simulation and control design for diesel engine NOx emission reduction technologies.

Degree: PhD, 5163, 2011, University of Illinois – Urbana-Champaign

Fuel efficiency and emission reductions are the two consistent drivers for internal combustion engine development for both on-highway and off-road vehicles. Advanced combustion technologies are proposed for the improvement of fuel consumption and reduction of harmful gas production inside the cylinder in laboratory engines. Outside cylinder technologies and after-treatment are the alternatives for a production engine to meet the stringent emission standards. Advanced control technologies play important roles in the realization of new technologies. This research was aimed at investigating possible techniques and feasible methods of implementation to reduce diesel engine emissions to meet the more stringent Tier 4 standards. In this study, two technologies are studied for off-road diesel engine NOx emission reductions: stoichiometric combustion ignition (SCI) and lean NOx trap (LNT). The concept of the stoichiometric compression ignition (SCI) engine was investigated for implementation in a turbocharged diesel engine through co-simulation. At first, an integrated environment for 1D engine modeling with control function was proposed for a SCI performance evaluation and control implementation. The SCI engine has been evaluated by Constant Speed Load Acceptance tests under steady-state and transient conditions. For SCI implementations, basic controls have been designed including air-fuel ratio (AFR) control, torque limiting control and idle speed control. The proposed control strategies have been verified with 1D detail models in the integrated environments. Further, the Mean Value Engine Model (MVEM) is proposed for advanced model based control design. The SCI engine subsystems are modeled using an orifice constrain model for throttle, turbine, and wastegate; filling and emptying model for intake and exhaust manifolds; rotational dynamic for engine camshaft and turbocharger shift, air-charging model and exhaust properties regressed by the data from integrated simulation at different engine operating conditions. The MVEM was implemented in Matlab/Simulink for verification. Modular and system verification was conducted for steady-state and transient state consistency with the 1D detail model. The results are promising, but the whole system needs further tuning for dynamic control design. The lean-NOx trap, as an alternative after-treatment for NOx control, has been studied for generic diesel engine emission control. Based on experimental data, an improved NOx adsorption model is proposed for integrated engine control and optimization. Advisors/Committee Members: Wang, Xinlei (advisor), Wang, Xinlei (Committee Chair), Hansen, Alan C. (committee member), Lee, Chia-Fon (committee member), Ting, K.C. (committee member).

Subjects/Keywords: Engine model; control design; Mean value model; Stoichiometric Compression Ignition; Co-design; Performance simulation; GT-Power; Simulink; Engine control Unit (ECU); Constant Speed Load Acceptance test; Idle speed control; Torque limiting; Air Fuel Ratio Control; NOx Reduction; Lean NOx Trap; After-treatment

…simulation of constant speed load acceptance test for SCI diesel engine based on John Deer 6090H… …simulation environment. 19 4.2 Constant Speed Load Acceptance Performance Simulation for SCI… …Engine Constant speed load acceptance (CSLA) tests simulate the load increase in non… …speed constant. For turbocharged diesel engines, this transient process tests the engine… …Conditions Search Constant Speed Load Acceptance tests were investigated at engine speeds of 900… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Wu, H. (2011). Performance simulation and control design for diesel engine NOx emission reduction technologies. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/26020

Chicago Manual of Style (16th Edition):

Wu, Hai. “Performance simulation and control design for diesel engine NOx emission reduction technologies.” 2011. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed November 23, 2020. http://hdl.handle.net/2142/26020.

MLA Handbook (7th Edition):

Wu, Hai. “Performance simulation and control design for diesel engine NOx emission reduction technologies.” 2011. Web. 23 Nov 2020.

Vancouver:

Wu H. Performance simulation and control design for diesel engine NOx emission reduction technologies. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2011. [cited 2020 Nov 23]. Available from: http://hdl.handle.net/2142/26020.

Council of Science Editors:

Wu H. Performance simulation and control design for diesel engine NOx emission reduction technologies. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/26020

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