Analysis of Variable Displacement Engine by Introduction of Hydraulic Crankshaft
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This document proposes a new design for an internal combustion engine with variable displacement. The design aims to optimize engine power by allowing the displacement, and therefore power output, to be varied according to need. This is achieved by introducing a hydraulically-actuated crankshaft that can vary the crank radius and thus the piston stroke length. The document outlines the objectives of studying how this mechanism varies engine capacity and compression ratio. It then describes the methodology of simulating the engine model and analyzing graphs of displacement, velocity and acceleration versus crank angle. The conclusion is that the new mechanism produces less vibration, longer engine life, smoother acceleration and lower emissions compared to existing variable displacement designs.
![International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056
Volume: 03 Issue: 01 | Jan-2016 www.irjet.net p-ISSN: 2395-0072
© 2016, IRJET | Impact Factor value: 4.45 | ISO 9001:2008 Certified Journal | Page 1314
FIG 4
(DISPLACEMET VS CRANK ANGLE)
FIG 5
(VELOCITY VS CRANK ANGLE)
FIG 7
(ACCELERATION VS CRANK ANGLE)
1. From fig.4 we can conclude that displacement
remain same
2. From fig.5 it is observed that no significant change
is visible
3. Fig.6 shows that there is change in aceeleration.
With this data we can conclude that new mechansim
has less vibration,longer life,less noise,smoother
acceleration and with the apllication of variable
compression assembly it will be emitting less
pollutants.
REFERENCES
[1] Amajd Shaik, N Shenbaga Vinayaga Moorthi and R.
Rudramoorthy “Variable compression ratio engine: a
future power plant for automobiles – an overview”2007
(PSG College of Technology).
*2+ Martyn Roberts “Benefits and Challenges of Variable
Compression Ratio (VCR)”2002 (Prod -rive Ltd).
*3+ Tadeusz J. Rychter, Andrzejn Teodorczyk “variable
compression ratio engine- VR/LE
concept”2003(Institute of Heat Engineering Warsaw
University of Technology).
*4+ GVNSR Ratnakara Rao, “Optimizing the
compression ratio of diesel fuelled CI engine”
2008(College of Engineering JNTU, Hyderabad, India).
*5+ Aina T., “Influence of compression ratio on the
performance characteristics of a spark ignition
engine”2012(Ahmadu -Bello University, Zaria, Nigeria).
*6+ Charles Mendler Envera LLC “Variable Compression
Ratio Engine”2009 (California) *7+ Nitin Wankhade
“Comparative investigation of vibration analysis of VCR
diesel engine for different types of grey cast iron”2013
(Department of Mechanical Egg, PRMIT&R, Bandera).](https://image.slidesharecdn.com/irjet-v3i1230-171023061104/85/Analysis-of-Variable-Displacement-Engine-by-Introduction-of-Hydraulic-Crankshaft-3-320.jpg)
Analysis of Variable Displacement Engine by Introduction of Hydraulic Crankshaft
- 1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 01 | Jan-2016 www.irjet.net p-ISSN: 2395-0072 © 2016, IRJET | Impact Factor value: 4.45 | ISO 9001:2008 Certified Journal | Page 1312 ANALYSIS OF VARIABLE DISPLACEMENT ENGINE BY INTRODUCTION OF HYDRAULIC CRANKSHAFT Utkarsh b Suthar1, Vipul Sudhakar 2, Priyesh Soni3, Charmil Parikh4, Akshay Patel5,Ankit Sindha6 1234 Student, Department of Mechanical Engineering, GTU, Gujarat, India 5 Student, Department of Instrumentation and Control, Nirma institute of Technology,India 6 Student, Department of Mechanical engineering, GTU,Gujarat,India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Conventional Internal combustion engine which have their displacement fixed due to which the engine maximum power at specific RPM is fixed the task is to make an engine which can have a variable capacity due to which power can be optimized as required. The main idea behind this is to save fuel without compromising the power. Previously attempts has been made to implement the concept like this, the military vehicles which had v8 engines were provided with a mechanism that the supply of fuel was cut off from some cylinder which ultimately reduces power and hence save fuel but in order to increase the capacity of engine we can only increase stroke length by increasing the crank radius this is different method of changing capacity as the old method was not so effective as losses of friction were there even after cutting of fuel supply. Key Words: Variable Displacement engine, Variable Compression Ratio, Hydraulic Crankshaft 1. INTRODUCTION Variable displacement engine which is topic of our study which increases efficiency without compromising the power the basic idea behind this is to deliver power only when necessary. The Variable Displacement Engine concept is used before but it was not as it says the displacement is not changed instead the fuel supply is cut-off. Variable compression ratio this concept is used widely now a days as it saves fuel and also emission are reduced greatly. There are several methods of changing compression ratio and some of them are now used in commercial vehicle also. Generally all the engines of a car like v8 or v12 engines are under loaded but this is the reason why they drain so much fuel. Or let’s take an example a truck fully loaded gives a mileage of 4kmpl and when it is empty it gives a mileage of 5kmpl now we can understand the concept of overloaded and under loaded. The conventional engines are of fixed capacity and produces fix amount of power at specific RPM so what we can do is change the displacement so that the power can be varied as per requirement. Suppose when we are cruising we don’t require much power at that time we can operate our engine at low capacity and when we need to accelerate at that time we can operate at its full capacity. There are currently two main types of cylinder deactivation used today, depending on the type of engine. The first is for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed. The second is used for overhead cam engines, and uses a pair of locked- together rocker arms that are employed for each valve. One rocker follows the cam profile, while the other actuates the valve. When a cylinder is deactivated, solenoid-controlled oil pressure releases a locking pin between the two rocker arms. While one arm still follows the camshaft, the unlocked arm remains motionless and unable to activate the valve after the price of oil surged in 2008, consumers were looking for a more fuel efficient car without sacrificing peak power. This has led many
- 2. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 01 | Jan-2016 www.irjet.net p-ISSN: 2395-0072 © 2016, IRJET | Impact Factor value: 4.45 | ISO 9001:2008 Certified Journal | Page 1313 manufacturers to put variable-displacement controls into their cars, especially those with V8s installed. 2. OBJECTIVE 1. Study the mechanism and calculating variation in capacity. 2. Study variation in compression ratio by changing stroke length. 3. Observing benefits of new mechanism by graphical method. 3. METHODOLOGY For changing the displacement of engine, stroke length must be varied it is done by the new designed crankshaft which can vary its crank radius. The model of this is simulated in algoodo education 2.0.1 And a 3d model is created in solid edge st5 FIG 1 FIG 2 FIG 3 For changing the compression ratio MCE-5 engine mechanism which uses electrical actuator. 4. CONCLUSION Using crank angle and piston position equation and differentiating it new equation is derived Position Velocity Acceleration By using this equation and putting data in it we get the graphs which are as follows
- 3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 01 | Jan-2016 www.irjet.net p-ISSN: 2395-0072 © 2016, IRJET | Impact Factor value: 4.45 | ISO 9001:2008 Certified Journal | Page 1314 FIG 4 (DISPLACEMET VS CRANK ANGLE) FIG 5 (VELOCITY VS CRANK ANGLE) FIG 7 (ACCELERATION VS CRANK ANGLE) 1. From fig.4 we can conclude that displacement remain same 2. From fig.5 it is observed that no significant change is visible 3. Fig.6 shows that there is change in aceeleration. With this data we can conclude that new mechansim has less vibration,longer life,less noise,smoother acceleration and with the apllication of variable compression assembly it will be emitting less pollutants. REFERENCES [1] Amajd Shaik, N Shenbaga Vinayaga Moorthi and R. Rudramoorthy “Variable compression ratio engine: a future power plant for automobiles – an overview”2007 (PSG College of Technology). *2+ Martyn Roberts “Benefits and Challenges of Variable Compression Ratio (VCR)”2002 (Prod -rive Ltd). *3+ Tadeusz J. Rychter, Andrzejn Teodorczyk “variable compression ratio engine- VR/LE concept”2003(Institute of Heat Engineering Warsaw University of Technology). *4+ GVNSR Ratnakara Rao, “Optimizing the compression ratio of diesel fuelled CI engine” 2008(College of Engineering JNTU, Hyderabad, India). *5+ Aina T., “Influence of compression ratio on the performance characteristics of a spark ignition engine”2012(Ahmadu -Bello University, Zaria, Nigeria). *6+ Charles Mendler Envera LLC “Variable Compression Ratio Engine”2009 (California) *7+ Nitin Wankhade “Comparative investigation of vibration analysis of VCR diesel engine for different types of grey cast iron”2013 (Department of Mechanical Egg, PRMIT&R, Bandera).