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6MV500: Advanced Powertrain Engineering

Added on - 22 Nov 2021

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6MV500
Advanced Powertrain Engineering
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Date of submission
TABLE OF CONTENTS
PISTON MOTION..........................................................................................................................2
INTRODUCTION.......................................................................................................................2
AIMS & OUTCOMES.................................................................................................................3
EQUIPMENT...............................................................................................................................3
RESULTS....................................................................................................................................3
CALCULATION AND ANALYSIS...........................................................................................3
DISCUSSION..............................................................................................................................6
CONCLUDING REMARKS.....................................................................................................11
REFERENCES...........................................................................................................................12
GEAR RATIO SELECTION........................................................................................................13
INTRODUCTION.....................................................................................................................13
AIMS & OUTCOMES...............................................................................................................15
ANALYSIS................................................................................................................................15
RESULTS..................................................................................................................................15
DISCUSSION............................................................................................................................15
1
LIST OF FIGURES
Figure 1 Piston motion for the crankshaft [source: Wikander,2004]..............................................3
Figure 2 The plot of the travel distance against angle [Matlab R2018b]........................................4
Figure 3 plot of speed on torque generation [Matlab r2018b].........................................................5
Figure 4 The road run test I [Matlab r2018b]..................................................................................6
Figure 5 The piston assembly [Maskinelement Handbook, 2003]..................................................7
Figure 6 The piston force balance...................................................................................................9
Figure 7 The piston side thrust load..............................................................................................10
Figure 8 The four-stroke engine balance.......................................................................................11
Figure 9 Estimated power and torque curves for the engine.........................................................16
Figure 10 The road run test............................................................................................................17
Figure 11 Plot of te RPM against the time [Matlab r2018b].........................................................17
Figure 12 The maximum possible top speed of the vehicle..........................................................18
Figure 13 [Wang]...........................................................................................................................20
LIST OF TABLES
Table 1 Experiment Table...............................................................................................................3
Table 2 Powertrain crank rotation...................................................................................................4
Table 3 Vehicle payload system parameters.................................................................................16
2
PISTON MOTION
INTRODUCTION
Piston motion is determined in terms of travel, speed, acceleration, and vibration. A
crankshaft connects a number of components that can be used to capture the drivetrain energy
during the rotational motion as well as combustion. The crankshaft is designed such that there is
a backbone centrally located to hold all the other components via a coaxial cylindrical rod. It is
referred to as the crankpin. The crankshaft turns the pistons up and down in a circular motion.
For the piston to spin evenly, other components are added to the crankshaft to help the engine
run smoothly. In the crankshaft, the crank pin transfers the force of the piston and connecting
rods into a rotational power. The piston velocity is given as the instantaneous rate of change in
the position of the system with respect to a reference variable. It is the first derivative of the
position curve. To determine the mean piston speed,
MPS(ftperminute)=RPM2stroke(inches)
12(inchesperfoot)
¿RPMstroke
6
The piston acceleration determines the force exerted with respect to the weight of the object and
the acceleration.
3
Figure1Piston motion for the crankshaft [source: Wikander,2004]
AIMS & OUTCOMES
(i)To determine the piston motion parameters and behavior for a particular engine
vehicle payload parameters
EQUIPMENT
(i)Engine simulation devices
RESULTS
Petrol mass and volume data
A 50ml density bottle was used and the warm up to room temperature.
Table1Experiment Table
ParameterTest 1Test 2Test 3Test 4
Empty bottle25.725.625.725.5
Bottle with petrol62.362.362.362.3
CALCULATION AND ANALYSIS
For the powertrain crank rotation, the change in the rotation angle has an impact on the piston
motion and as a result, the travel distance and acceleration.
4
Table2Powertrain crank rotation
050100150200250300350400
Angle
0
5
10
15
20
25
30
35
40
45
Travel Distance
Crankshaft Position-->Travel Distance
PowerTrain
Figure2The plot of the travel distance against angle [Matlab R2018b]
More information is provided on the speed versus the torque that is generated,
5
80828486889092949698100
Speed
20
21
22
23
24
25
26
27
28
Torque
Speed on Torque Generation
PowerTrain
Figure3plot of speed on torque generation [Matlab r2018b]
6
6080100120140160180200
Time(sec)
0
2
4
6
Power(Watts)
Road Run Tests
Power
6080100120140160180200
Time(sec)
0
20
40
60
Speed(km/h)Speed
6080100120140160180200
Time(sec)
0
5000
10000
Revolutions per minute(RPM)
RPM against Time
Figure4The road run test I [Matlab r2018b]
DISCUSSION
There are different automotive components that rely on the lubrication that is applied on the
engine for it to operate and every experience affects more than one regime of lubrication for a
7
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