scholarly journals Kinematic Conceptual Design of In-Line Four-Cylinder Variable Compression Ratio Engine Mechanisms Considering Vertical Second Harmonic Acceleration

2020 ◽  
Vol 10 (11) ◽  
pp. 3765 ◽  
Author(s):  
Seung Woo Kwak ◽  
Jae Kyung Shim ◽  
Young Kwang Mo
Keyword(s):  
Conceptual Design ◽  
Compression Ratio ◽  
Second Harmonic ◽  
Design Method ◽  
Industrial Applications ◽  
Design Stage ◽  
Dimensional Synthesis ◽  
Design Factor ◽  
Variable Compression Ratio ◽  
Variable Compression

In the in-line four-cylinder engine, it is well known that the shaking force is due to the vertical second harmonic acceleration components of the pistons. This paper proposes a kinematic conceptual design method to determine the kinematic structure of a feasible in-line four-cylinder variable compression ratio (VCR) engine and its dimensions that would yield a lower vertical second harmonic acceleration at joints. Through type and dimensional synthesis, candidate VCR engine mechanisms are chosen and their dimensions satisfying design specifications are determined. Based on the analysis of the vertical second harmonic acceleration components at the joints, a feasible mechanism for an in-line four-cylinder VCR engine is selected. Then, the method finds the dimensions that yield a nearly minimized sum of the vertical second harmonic acceleration at each joint by adjusting the link lengths within specified tolerances. For validation, the result is compared with that of a constrained optimization using MATLAB. The proposed method would be useful at the conceptual design stage of multi-link multi-cylinder VCR and variable-stroke engine mechanisms where the second harmonic acceleration is an important design factor in the automotive industrial applications.

scholarly journals Determination of Combustion Process Model Parameters in Diesel Engine with Variable Compression Ratio

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Saša Milojević ◽  
Radivoje Pešić
Keyword(s):  
Diesel Engine ◽  
Compression Ratio ◽  
Process Model ◽  
Internal Combustion Engines ◽  
Combustion Process ◽  
Exhaust Emission ◽  
Model Parameters ◽  
Connecting Rod ◽  
Variable Compression Ratio ◽  
Variable Compression

Compression ratio has very important influence on fuel economy, emission, and other performances of internal combustion engines. Application of variable compression ratio in diesel engines has a number of benefits, such as limiting maximal in cylinder pressure and extended field of the optimal operating regime to the prime requirements: consumption, power, emission, noise, and multifuel capability. The manuscript presents also the patented mechanism for automatic change engine compression ratio with two-piece connecting rod. Beside experimental research, modeling of combustion process of diesel engine with direct injection has been performed. The basic problem, selection of the parameters in double Vibe function used for modeling the diesel engine combustion process, also performed for different compression ratio values. The optimal compression ratio value was defined regarding minimal fuel consumption and exhaust emission. For this purpose the test bench in the Laboratory for Engines of the Faculty of Engineering, University of Kragujevac, is brought into operation.

Conceptual Design of Kenaf Polymer Composites Automotive Spoiler Using TRIZ and Morphology Chart Methods

2015 ◽  
Vol 761 ◽  
pp. 63-67 ◽  
Author(s):  
Muhd Ridzuan Mansor ◽  
S.M. Sapuan ◽  
A. Hambali ◽  
Edi Syam Zainudin ◽  
A.A. Nuraini
Keyword(s):  
Polymer Composites ◽  
Conceptual Design ◽  
New Product Development ◽  
Design Method ◽  
Idea Generation ◽  
Development Stage ◽  
Concept Development ◽  
Design Stage ◽  
Concept Design ◽  
Solution Strategies

Spoilers are part of an automotive exterior bodywork system that acts to create additional down force for higher traction. In this paper, a new conceptual design of automotive spoiler component using kenaf polymer composites was developed using integrated TRIZ and morphology chart design method. The aim is to enable direct application of kenaf polymer composites to the spoiler design to achieve better environmental performance of the component while maintaining the required structural strength for safe and functional operation. The overall process involved two major stages, which are the idea generation and concept development. TRIZ method was applied in the idea generation stage where specific solution strategies for the design were created. In the concept development stage, the specific TRIZ solution strategies obtained were later refined into relevant alternative system elements using Morphology chart method. Finally, a new conceptual design of an automotive spoiler was developed using the combination of the identified system elements. The integrated TRIZ and morphology chart method were found to be new tools that can be used effectively in the concept design stage, especially in cases where direct material substitution is given the main focus for the new product development.

Effect of Variable Compression Ratio on Performance and Emissions in Compression Ignition Engine Fuelled with Waste Cooking Oil with Copper Oxide Nano Fluid Blends

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
Durai Kumaran ◽  
S.P. Sundar Singh Sivam
Keyword(s):  
Waste Management ◽  
Copper Oxide ◽  
Compression Ratio ◽  
Alternative Fuels ◽  
Waste Cooking Oil ◽  
Compression Ignition ◽  
Variable Compression Ratio ◽  
Cooking Oil ◽  
Nano Fluids ◽  
Variable Compression

One of the challenging issues in the world today is waste management. Improper waste management could be the main source of environmental pollution. In this context, an attempt has been made to prevent the disposal of large quantities of Waste Cooking Oil (WCO) from hotels and restaurants and utilize them as a fuel in diesel engines. WCO is one of the viable alternative fuels, used by researchers in Compression Ignition (CI) engines due to its low cost, no toxicity, biodegradability and renewability. In this research, copper oxide (CuO) nano fluids were prepared by an one-step chemical synthesis method in different mass fractions of 15 ppm, 25 ppm, 35ppm and 50 ppm and blended with WCO. Based on the fuel stability, WCOCN25 and WCOCN50 test fuels are considered. The diesel and WCO were considered as base fuels. A fully equipped, single cylinder, four stroke, water cooled, direct injection, variable compression ratio diesel engine was used for experimentation. The compression ratio of the engine was varied from 16:1 to 18:1. The engine was loaded at different loading conditions by an eddy current dynamometer to measure the performance and emission parameters for the test fuels. The experimental results have shown that the addition of CuO nano fluids and increasing the compression ratio improved the Brake Thermal Efficiency (BTE) of the engine. It is observed that the combustion parameters have been improved due to the higher ignition delay and catalytic activity of CuO nano fluids. In addition, CuO nano fluids have a major role in controlling hydrocarbon (HC), carbon monoxide (CO), oxides of nitrogen (NOx) and smoke emissions.

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