scholarly journals Efficiency of a new internal combustion engine concept with variable piston motion

2014 ◽  
Vol 18 (1) ◽  
pp. 113-127 ◽  
Author(s):  
Jovan Doric ◽  
Ivan Klinar
Keyword(s):  
Fuel Consumption ◽  
Compression Ratio ◽  
Heat Engine ◽  
Integrated Treatment ◽  
Constant Volume ◽  
Ic Engine ◽  
Variable Compression Ratio ◽  
Variable Displacement ◽  
Engine Concept ◽  
Variable Compression

This paper presents simulation of working process in a new IC engine concept. The main feature of this new IC engine concept is the realization of variable movement of the piston. With this unconventional piston movement it is easy to provide variable compression ratio, variable displacement and combustion during constant volume. These advantages over standard piston mechanism are achieved through synthesis of the two pairs of non-circular gears. Presented mechanism is designed to obtain a specific motion law which provides better fuel consumption of IC engines. For this paper Ricardo/WAVE software was used, which provides a fully integrated treatment of time-dependent fluid dynamics and thermodynamics by means of onedimensional formulation. The results obtained herein include the efficiency characteristic of this new heat engine concept. The results show that combustion during constant volume, variable compression ratio and variable displacement have significant impact on improvement of fuel consumption.

Investigation on the response time of a self-regulation variable compression ratio engine

2021 ◽  
pp. 095440622199522
Author(s):  
Adrian Clenci ◽  
Vasile Hara ◽  
Nicolae-Doru Stănescu ◽  
Rodica Niculescu
Keyword(s):  
Response Time ◽  
Compression Ratio ◽  
Self Regulation ◽  
Combustion Process ◽  
Ghg Emissions ◽  
Operating Conditions ◽  
Ic Engine ◽  
Passenger Car ◽  
Variable Compression Ratio ◽  
Variable Compression

Today, the greenhouse gas (GHG) emissions (specifically, CO2) represent the greatest challenge of the internal combustion (IC) engine and consequently, now, more than ever, the passenger car industry is looking for technologies meant to address this issue. Since CO2 emission is related to the combustion process occurring inside the engine, its reduction is inherently connected to lowering the fuel consumption, meaning that the only way to reduce it in the IC engine is to increase its overall efficiency. One solution to do this over the whole operating area is to fit the engine with a variable compression ratio (VCR) system, which may be advantageously combined with other enhancing-efficiency technologies. However, to avoid knocking and pre-ignition, such an engine should feature an adequate response time during the transition from the maximum compression ratio to the minimum one. Consequently, this paper describes a theoretical investigation on the kinematics and dynamics of a hinged VCR engine’s upper block tilting motion, aiming to show that this engine, as an automatic system with self-regulation of compression ratio, can respond adequately when the operating conditions change fast. This is paramount for the passenger car road mobility, which means anything but steady operation.

Effect of Variable Compression Ratio on Performance and Emissions Characteristics of IC Engine

2016 ◽  
Vol 37 (6) ◽  
pp. 317-326
Author(s):  
S.V.Umamaheswara Rao ◽  
◽  
Amrut raj ◽  
K. Satya narayana ◽  
T.V.Hanumantha Rao ◽  
...  
Keyword(s):  
Compression Ratio ◽  
Ic Engine ◽  
Variable Compression Ratio ◽  
Performance And Emissions ◽  
Variable Compression

scholarly journals Unaccounted Heat Distribution in a Variable Compression Ratio Internal Combustion Engine

2019 ◽  
Vol 8 (6) ◽  
pp. 2149-2155
Keyword(s):  
Fuel Consumption ◽  
Compression Ratio ◽  
Combustion Engine ◽  
Specific Fuel Consumption ◽  
Quantitative Relation ◽  
Heat Distribution ◽  
Chemical Action ◽  
Variable Compression Ratio ◽  
Variable Compression Ratio Engine ◽  
Variable Compression

The compression ratio on heat distribution in an exceedingly variable compression ratio engine. The compression ratio powerfully affects the operating method and provides an exceptional degree of management over engine performance. Variable Compression quantitative relation (V.C.R) engine check rig is employed to see the result of Compression ratio (C.R) on the performance and emissions of the engine and also the distribution of warmth during a variable compression ratio engine. The performance frequency parameters like efficiencies, power adopted, and specific fuel consumption square measure determined. Further, combustion development is additionally discovered through this work, we will notice the optimum compression ratio that the simplest performance is feasible. So as to search out optimum compression ratio, experiments were dispensed on one cylinder four stroke variable compression ratio diesel motor. Tests were dispensed at compression ratios of fifteen, 16, 17.5, 19 and 21 at totally different masses the performance characteristics of engine like Brake power (BP), Brake Thermal potency (BTE), Brake Specific Fuel Consumption (BSFC). Results show a major improved performance at a compression ratio twenty one. The compression ratios lesser than 21 showed an increase in brake thermal potency, come by fuel consumption. The warmth is that the governing issue that operates whole engine and turn out power. Compression ratio between 19 to 21 provides optimum results in distribution of unaccounted heat also improves thermal performance of engine, Each fuel within the world is employed to supply certain quantity of warmth by either mechanical or chemical action. The heat is created by fuel is employed to reciprocate piston within combustion chamber and this reciprocatory motion is regenerate to movement power to regulator by exploitation crank and rod mechanism.

scholarly journals A Comparison Between Two-Position Variable Compression Ratio and Continuously Variable Compression Ratio Engines Using Numerical Simulation

2009 ◽  
Author(s):  
Ray Malpress ◽  
David R. Buttsworth
Keyword(s):  
Numerical Simulation ◽  
Fuel Consumption ◽  
Compression Ratio ◽  
Feedback Mechanism ◽  
Driving Cycle ◽  
Load Range ◽  
Variable Compression Ratio ◽  
Full Load ◽  
Acceleration Rate ◽  
Variable Compression

Two types of variable compression ratio engine are considered: i) a continuously variable compression ratio (VCR) device that optimises engine efficiency at all loads, and ii) a VCR device that allows the engine to operate at one of two discrete compression ratios. The simulated engine configuration uses late intake valve closing (LIVC). A maximum geometric compression ratio (GCR) of 17:1 is adopted in the simulations resulting in a constant effective compression ratio of 10.2:1 in all configurations. Reduction from full load is achieved in the simulation with LIVC until the maximum GCR is reached after which lower loads are achieved through throttling. In the two-position VCR engine simulation, the full load range is achieved through throttling in combination with LIVC. At part load, in combination with LIVC, the VCR devices increase the geometric compression ratio to return the effective compression ratio to that for full load in each case. Fuel consumption for the New European Driving Cycle (NEDC) is assessed via numerical simulation for a representative vehicle. The simulations indicate that the increase in net fuel consumption over a driving cycle is effectively no different for the two-position VCR engine relative to a continuously variable CR and this justifies further research into two-position VCR technology. Net fuel consumption can also be improved by the use of a limited acceleration that maintains the engine in the reduced compression stroke configuration. An acceleration rate with a driver feedback mechanism is proposed which, in combination with a two-position VCR engine, shows potential for significant reduction in fuel consumption of greater than 15% relative to the full compression, fixed CR configuration for the NEDC.

scholarly journals Performance Investigation of Variable Compression Ratio Engine

2021 ◽  
Vol 9 (10) ◽  
pp. 1296-1306
Author(s):  
Vimal Patel
Keyword(s):  
Fuel Consumption ◽  
Compression Ratio ◽  
Thermal Efficiency ◽  
Full Range ◽  
Specific Fuel Consumption ◽  
Engine Fuel ◽  
Vehicle Performance ◽  
Variable Compression Ratio ◽  
Variable Compression Ratio Engine ◽  
Variable Compression

Abstract: Variable Compression Ratio (VCR) engine test can be used to determine the effect of Compression Ratio (CR) on the performance and emissions of the engine. The combustion situation, when provided with a pressure transducer. The performance frequency parameters like efficiencies, power, and specific fuel consumption are determined. The combustion phenomenon is also observed through this work, we can find the optimum compression ratio for which the best performance is possible. In order to find out the optimum compression ratio, experiments were carried out on a single-cylinder four-stroke variable compression ratio engine. Tests were carried out at compression ratios of 18, 17, and 16 at different loads the performance characteristics of the engine like Brake power (BP), Thermal Efficiency, Brake Specific Fuel Consumption (BSFC). A variable compression ratio engine is able to operate at different compression ratios, depending on particular vehicle performance needs. The VCR engine is optimized for the full range of driving conditions, as acceleration, speed, and load. Keywords: Performance, Compression ratio, Load, Break Power, William Line’s Method, Emission, Thermal Efficiency, Diesel Engine, Fuel Consumption

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