18sept2013 2142109 auto studies wk6to7 powertrain nnw.pdf
TRANSCRIPT
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2142109 Automotive Studies
Powertrain Basic 19, 26 September 2013
By Dr. Nuksit Noomwongs
PresenterPresentation NotesWhat is a powertrain?
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Overview
How 4 strokes SI engine work (4)
Torque () and Power () Engine technology Future trend Transmission () The Veyron
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Objectives Understand how SI engine ()
work Basic concepts of transmission system Aware of the future trend in powertrain
technology Prepare knowledge for vehicle routine
maintenance
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VDO CLip
http://www.metacafe.com/watch/689942/how_a_car_engine_works_3d_animation/
Engine 3D Animation
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What and Why?
What? Powertrain = propulsion unit Powertrain = engine + transmission
Why?
PresenterPresentation NotesWhy? = For convenience
http://images.google.com/imgres?imgurl=http://www.angelfire.com/oh/daman70/images/flintstones.jpg&imgrefurl=http://www.angelfire.com/oh/daman70/cartoon.html&h=600&w=800&sz=168&tbnid=QNuI2IpZ46-j9M:&tbnh=106&tbnw=142&hl=th&start=5&prev=/images%3Fq%3DFlintstones%2Bcar%26svnum%3D10%26hl%3Dth%26lr%3D%26rls%3DRNWE,RNWE:2004-37,RNWE:en%26sa%3DN
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Steam engine ()
Use in the past Big and heavy (require boiler and separate
piston unit)
PresenterPresentation NotesSteam is an external combustion engine
http://en.wikipedia.org/wiki/Steam_enginehttp://www.astbury.org/photos/steam/engine.jpg
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Current engine Internal Combustion Engine (ICE) (
) Spark ignition engine (SI engine
) 4 strokes 2 strokes
Compression ignition (CI engine )
4 strokes 2 strokes
PresenterPresentation NotesWhy call ICE?
http://www.isuzu.co.jp/world/press/2004/image/p_1012_2.jpghttp://www.fortunecity.co.uk/pitstop/demolition/142/images/bar_11.jpg
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Explain how 4 strokes engine work How does the engine work?
PresenterPresentation NotesHow does the engine work?
http://www.todaracing.com/images/engine_mugen_formula4.jpg
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Combustion?
Enclosed container Filled with fuel Combustion? ()
PresenterPresentation Notes
Combust???
http://www.rivervalleycoop.com/images/E0057801/FuelTruck.jpghttp://hcpc.uth.tmc.edu/pihome/images/match.jpg
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Combustion?
Enclosed container Filled with air (O2) Combustion?
PresenterPresentation Notes
Combust???
http://www.carolinaapothecary.com/i/o2.gifhttp://hcpc.uth.tmc.edu/pihome/images/match.jpg
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Combustion?
No heat source Combustion?
PresenterPresentation NotesCombust???
http://www.carolinaapothecary.com/i/o2.gifhttp://hcpc.uth.tmc.edu/pihome/images/match.jpg
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Combustion?
Fuel + air (Oxygen) + energy Combustion?
PresenterPresentation NotesEnergy could come in different format
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Air fuel mixture
Fuel in open container Explode?
PresenterPresentation NotesExplosion, definition, rapid burning for all the fuel at once?
http://upload.wikimedia.org/wikipedia/commons/thumb/c/ca/Fuel_Barrels.JPG/250px-Fuel_Barrels.JPG
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Air fuel mixture ()
Maximize contacting surface between fuel and air
Injector
PresenterPresentation Notes
http://www.injectorcleaning.co.uk/pic/spray.jpg
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Air fuel mixture Air/Fuel ratio (A/F ratio)
Ratio of Weight Weight of Air Weight of Fuel
14.7:1 = stoicheometric
Combustible range 8:1-22:1
Theoretical complete combustion
PresenterPresentation NotesStoicheometric, in chemical equation, perfect burning
http://upload.wikimedia.org/wikipedia/commons/thumb/c/ca/Fuel_Barrels.JPG/250px-Fuel_Barrels.JPG
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Input energy
Spark
Spark plug ()
PresenterPresentation Notes
http://www.ted-kyte.com/3D/Pictures/Spark%20Plug.jpghttp://www.workdance.com/Gallery_Pages/boschplug.html
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Compression
How does the engine create compression?
Reducing in volume will increase in pressure.
Compression
PresenterPresentation NotesDraw
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4 strokes engine in short Engine needs these factors in order to
operate Right air fuel mixture Heat (Spark Ignition) Compression
Air + Fuel combustion
compression
Energy (To fire Air + Fuel) EFI: Electronic Fuel
Injection system ECU: Electronic Control Unit
PresenterPresentation Noteshttp://www.sdsefi.com/features/july02civic.htm
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ECU Sensor Actuator
EFI: Electronic Fuel Injection System
Fuel injector
Air/Fuel Ratio
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4 Strokes engine Animation
http://www.youtube.com/watch?v=V-z-R8Mv_HM How a car engine works
http://www.youtube.com/watch?v=OXd1PlGur8M Engine 3D components
http://www.youtube.com/watch?v=QXLsna21FWo Engine 3D components
http://www.youtube.com/watch?v=ep1NhANcCL4 Combustion engine animation
http://www.youtube.com/watch?v=yfemRjclAvk Combustion animation
http://www.youtube.com/watch?v=-xRKZPXHXd4&feature=related EcoBoost
http://www.youtube.com/watch?v=Pj6DZjCQ6zo Diesel Combustion
http://www.youtube.com/watch?v=6BCgl2uumlI Rotary engine
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4 strokes engine in short Intake stroke () To get air+fuel mixture
in the combustion chamber ()
Piston () is moving down
Air+fuel () is coming in Intake valve () is
opened Exhaust valve () is
closed
PresenterPresentation NotesHow did the system know when to open the valve and when to close the valve???
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4 strokes engine in short Compression stroke
() Create compression
Piston is moving up Both intake and
exhaust valves are closed
Gas is compressed
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4 strokes engine in short Power stroke () The only stroke that
produce power Both intake and exhaust
valves are closed Spark plug () ignite
the air fuel mixture Piston is moving down
from the explosion
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4 strokes engine in short Exhaust stroke () Remove burned gas,
get ready for repeating the intake stroke Piston is moving up Intake valve is closed Exhaust valve is opened
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4 strokes Flash from howstuffworks.com
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Fuel type at Gasoline station
Regular 91 (Octane No. = 91) 95 super (Octane No. = 95) Gasohol (% of alcohol in fuel)
E10 (E10 91, E10 95) E20 E85
Diesel Bio diesel
B2, B5
Octane No. ? Ability to resist to
Pre-ignition (knock) Compression ratio
Fuel consumption
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Overview
How 4 strokes SI engine work Torque and Power Engine technology Future trend Transmission The Veyron
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Basic theory
Torque VS power? Towing vehicle up the hill
Torque or power? Top speed
Torque or power?
PresenterPresentation NotesWhat is the different between torque and power
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Basic Theory
Torque VS. Power Torque ability to do work
PresenterPresentation NotesTorque, similar to strength
http://www.weight-lifting-exercise.com/woman2.jpghttp://www.weight-lifting-world.com/images/lifting-weights.jpghttp://clubs.hemmings.com/clubsites/fiat500canada/img/500-d-solalg.jpghttp://www.photobyjohn.com/images/botw/mt.jpg
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Basic Theory
Torque VS. Power Power = rate of work
Low torque could still achieve high
power
While high torque could have lower
power
PresenterPresentation NotesConcept of moving brick
http://www.popartuk.com/g/l/lg8528.jpghttp://www.fotosearch.com/comp/IMZ/IMZ140/pgi0117.jpghttp://www.motordesktop.com/wallpaper/sportscars/Honda%20Civic%20Type%20R%20-%201024x768.jpghttp://www.shieldmotorcompany.com/Toyota%20Vigo%20in%20silver.jpg
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Basic Theory
Torque VS. Power Torque ability to do work
to pull itself (acceleration, uphill, towing, etc.)
PresenterPresentation NotesLuigi
http://www.weight-lifting-exercise.com/woman2.jpghttp://www.weight-lifting-world.com/images/lifting-weights.jpghttp://clubs.hemmings.com/clubsites/fiat500canada/img/500-d-solalg.jpghttp://www.photobyjohn.com/images/botw/mt.jpghttp://www.ruhr-guide.de/artikel_pix/Cars_Bild_luigi.jpg
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Basic Theory Torque () VS. Power () Power = rate of work ()
Low torque could achieve high power While high torque
could have lower power
PresenterPresentation Notes
http://www.popartuk.com/g/l/lg8528.jpghttp://www.fotosearch.com/comp/IMZ/IMZ140/pgi0117.jpghttp://www.motordesktop.com/wallpaper/sportscars/Honda%20Civic%20Type%20R%20-%201024x768.jpghttp://www.shieldmotorcompany.com/Toyota%20Vigo%20in%20silver.jpg
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Basic Theory Generally High torque high acceleration High power high top speed
PresenterPresentation Notes
http://www.popartuk.com/g/l/lg8528.jpghttp://www.fotosearch.com/comp/IMZ/IMZ140/pgi0117.jpghttp://www.motordesktop.com/wallpaper/sportscars/Honda%20Civic%20Type%20R%20-%201024x768.jpghttp://www.shieldmotorcompany.com/Toyota%20Vigo%20in%20silver.jpg
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Basic Theory Power
Rate of work Work (energy) Power energy/time
Torque x angular velocity Unit
hp (horse power) kW (1hp = 0.746 kW)
PresenterPresentation NotesHorse power come from James Watt, amount of work that the horse can do in one minute
http://static.howstuffworks.com/gif/horsepower1.gif
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Car A: 1000kg weight 100 Hp
Car B: 1100kg weight 110 Hp
Car C: 900kg weight 100 Hp
Weight/Hp 10 10 9
Other related factor to acceleration performance
Aerodynamics performance
Weight per HP
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Overview
How 4 strokes SI engine work Torque and Power Engine technology Future trend Transmission The Veyron
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Basic Theory
Number of cylinders More number of cylinders, generally = faster
engine speed, why?
PresenterPresentation NotesMore power during 2 crank revolutionSmaller inertia
http://www.yosino.ru/dvs/img/3s-ge.jpghttp://www.mitsubishi-fto.org/dawn-spec/gpx/i/engine_bay02.jpg
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Engine specification
Capacity (cc) performance, fuel consumption
Number of cylinder Engine layout Power Torque
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Basic Theory
Cylinder layout Inline V Boxer
PresenterPresentation NotesDraw the layout on the board, show the benefit of each system
http://static.howstuffworks.com/gif/engine-inline-4.jpghttp://library.thinkquest.org/19199/java/advanced/engine/images/v8.gifhttp://static.howstuffworks.com/gif/engine-v-6.jpghttp://www.subaru.co.uk/IMGGB/WWW/Subaru_co_uk.nsf/NULL/9DF2774F293F2DC680256F5000540A6A/$FILE/boxerengine.jpg
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Engine Technology
Turbo charge More air +fuel =
more power
http://www.youtube.com/watch?v=vGhlgphrBxA
PresenterPresentation Notes
http://www.streettuners.com/curve/turbo/e_greddy_turbo_engine_thmb.jpghttp://www.ys-garage.net/sumitani-eg2.jpg
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Engine Technology
Super charge: It uses engine mechanical power to drive supercharge (pump) to increase air flow into an engine.
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Engine Technology
NOS Nitrous oxide (N2O)
Injected N2O (oxygen) + Fuel into the engine
More air +fuel = more power
PresenterPresentation Noteshttp://www.aperaceparts.com/resources/nos/noskit.gifhttp://www.jesper.nu/community/upload/users/28945/images/606832184-(Pic)z-cars-The_20Fast_20and_20the_20Furious_20Mitsubishi_20Eclipse(1)(1)_20(2)%5B1%5D.jpg
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Engine Technology Alternative fuel
LPG (Liquid Petroleum Gas) NGV (Actually it is called CNG, Compressed
Natural Gas, worldwide) Other type of fuel
Bio-diesel (CI) Diesel + Vet oil
Gasohol (SI) (Gasoline + Alcohol )
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LPG
CNG
Lower pressure
Higher pressure
Lighter
Heavier
Hot Temp
Hotter Temp
Life time of Seal (Gasket) and rubber tubes
Engine Oil: More viscosity is needed
Lubrication Level of coolant
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Common Rail
For diesel engine Common Rail = electronic direct fuel
injection Use very high injection pressure
http://www.youtube.com/watch?v=6R0aMPZ8Np0
PresenterPresentation Notes
http://www.channel4.com/4car/media/T/toyota/avensis/03-large/05-d4d-engine.jpghttp://www.saedayton.org/meetings/dmax-02/dmax.jpg
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Advance engine technology Hybrid ?
PresenterPresentation Notes
http://www.theautochannel.com/news/2002/10/28/149613.1-lg.jpg
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Advance engine technology Hybrid
Toyota Prius, Honda Insight, etc. Mild hybrid (Insight, Jazz: 16km/l, Civic: 18 km/l) Full hybrid (Prius: 25km/l, Camry: 15-18 km/l)
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Advance engine technology Hybrid
Insight mild hybrid engine
PresenterPresentation Notes
http://static.howstuffworks.com/gif/hybrid-car-insight-front.jpghttp://www.metrokc.gov/procure/green/Prius%20hood.JPGhttp://static.howstuffworks.com/gif/hybrid-car-insight-engine.jpg
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Overview
How 4 strokes SI engine work Torque and Power Engine technology Future trend Transmission The Veyron
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The future Fuel cell Hydrogen
Infrastructure H2 container
PresenterPresentation NotesElectrochemical energy conversion device, similar to battery
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Overview
How 4 strokes SI engine work Torque and Power Engine technology Future trend Transmission The Veyron
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What and Why? What is a transmission?
A mechanical system which transfer or convert torque and speed from the engine to the wheels
Why does a car need one? Different speed and torque requirements
for various driving condition
Lower gear: higher acc. Lower gear: lower limit speed
Engine has speed limit: Ex. 6000 rpm (rpm: round per minute)
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Road load Road load = force that against the
motion of the vehicle Torque @ wheels > road load move
PresenterPresentation NotesTorque at the wheel must overcome the road load in order for the vehicle to move
http://www.travellerspoint.com/photos/43559/PICT1232.JPG
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Road load
At constant vehicle speed Road load = ? Aerodynamics drag, tire
rolling resistance, Slope (road grade) Road load = Driving effort
Acc.
PresenterPresentation NotesRolling resistance (Michelin Energy, tyre pressure), wind, towing, moving up the hill
http://www.et4wd.org/rides/harlanky/2006-01-15/Joe%20Tow.jpg
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Road load
At constant vehicle acceleration Road load = ? Driving effort > road load
Dcc. Brake
PresenterPresentation NotesTorque must overcome the road load in order for the vehicle to move, at same engine speed, WOT, engine produce same torque, how do you cope with changing road load requirement
http://www.et4wd.org/rides/harlanky/2006-01-15/Joe%20Tow.jpg
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Road load
How it relates to the gear ratio?
PresenterPresentation NotesWhy does the mountain bike has gear? Which gear do you use when you climb up the hill??? Why? Speed and torque relation?
http://www.shop72.com/mountainbike/images/mountain%20bike%20SM900.jpghttp://www.fassanews.com/foto/1024/mountain-bike.jpg
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Purpose of the gearbox
Gears types
PresenterPresentation NotesMerits of each one
http://www.arrowgear.com/images/helical_gears.JPGhttp://static.howstuffworks.com/gif/gear-spur.jpghttp://kmoddl.library.cornell.edu/stillImages/Chicago/small/010.jpg
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Gear concept From the picture, speed
relation between input and output?
Power = constant Power = Torque x angular speed Torque relation between
input and output?
PresenterPresentation NotesExplain why power is always constant?
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Where N= number of teeth d=diameter T= torque w=angular velocity
Gear concept (summary) Gears
Ratio Without any friction loss
Pin = Pout
in
out
NNratio =
in
out
in
out
in
out
dd
dd
NNratio =
==
in
out
out
in
TTratio ==
1212 :ratio ==
Large to small Small to large
outoutinin TT =
PresenterPresentation NotesProve the equation to the students
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Gearbox
In a vehicle
PresenterPresentation Notes
http://auto.howstuffworks.com/transmission.htm
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Transmission type
Manual (5 gears or 6 gears) Automatic (4 or 5 gears) CVT (Continuous Variable Transmission) Dual Clutch (Manual + Automatic or
Automate Manual transmission)
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Five speed manual transmission
http://www.youtube.com/watch?v=aAWxZRuBXtw
http://www.youtube.com/watch?v=CV0ezQYa6OA
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Automatic Transmission
http://www.youtube.com/watch?v=MeyAR8qAOwo
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CVT
Continuous Variable Transmission (CVT) consists of two pulleys (gears) that can change diameter, with a belt connecting the two. The diameters of the pulleys are changed in unison to move from low (left picture) to high (right). Power from the engine is delivered to the top pulley, while the bottom drives the wheels.
http://www.youtube.com/watch?v=2OMqmpjOHWM
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Dual Clutch Transmission
http://drivelinenews.com/videos/dual-clutch-transmission-animation/
The diagram shows this arrangement for a typical five-speed DCT. Notice that one clutch controls second and fourth gears, while another, independent clutch controls first, third and fifth gears. That's the trick that allows lightning-fast gear changes and keeps power delivery constant. A standard manual transmission can't do this because it must use one clutch for all odd and even gears.
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Gearbox Notes High torque at low vehicle speed
(lower gear) for Acceleration Hill climbing
Overdrive (ratio < 1:1), normally 5th gear in manual and 4th gear in automatic Output spin faster than input Reduce engine RPM for improving fuel
consumption
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How Car Transmission works Animation / VDO Clip
http://www.youtube.com/watch?v=D_i3PJIYtuY&feature=related How gear works
http://www.youtube.com/watch?v=K4JhruinbWc How differential gear works (Classic)
http://www.youtube.com/watch?v=gIGvhvOhLHU&feature=related How differential gear works (modern)
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Overview
How 4 strokes SI engine work Torque and Power Engine technology Future trend Transmission The Veyron
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Bugatti Veyron
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Bugatti Veyron Engine that can produce 1,001
horsepower Top speed of 250+ mph (400+ kph)
Zero-to-60 time of three seconds
PresenterPresentation Notes
http://www.autoclub.com.au/uploaded_images/bugatti-veyron-w16-705517.jpg
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Bugatti Veyron
A price tag somewhere in the $1.2 million range
PresenterPresentation Notes
http://members.fortunecity.com/freecarwallpapers/images/bugatti_veyron_04.jpg
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Bugatti Veyron
Engine W-16 8 lt engine 4 turbos
Transmission 7 speed All wheel drive
PresenterPresentation Notes
http://www.autozine.org/Car_Photo/Bugatti/Veyron_eng2.jpg
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Bugatti Veyron
comparison Veyron Vios
Engine size 7,995 cc 1,496 cc
Number of cylinders
16 4
Horsepower 1,001 hp @ 6000 RPM
109 PS @ 6000 RPM
Torque 1,249 N.m @ 2,200-5,500 RPM
142 N.m @ 4,200RPM
Transmission 7 speed 4 speed AT/ 5 speed MT
PresenterPresentation NotesHow did Veyron achieve this number?
http://www.autozine.org/Car_Photo/Bugatti/Veyron_eng2.jpg
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Questions
???
2142109 Automotive StudiesOverviewObjectivesVDO CLipWhat and Why?Steam engine () Current engineExplain how 4 strokes engine workCombustion?Combustion?Combustion?Combustion?Air fuel mixtureAir fuel mixture ()Air fuel mixtureInput energyCompression 4 strokes engine in shortSlide Number 194 Strokes engine Animation 4 strokes engine in short4 strokes engine in short4 strokes engine in short4 strokes engine in short4 strokes Fuel type at Gasoline stationOverviewBasic theoryBasic TheoryBasic TheoryBasic TheoryBasic TheoryBasic TheoryBasic TheoryWeight per HP OverviewBasic TheorySlide Number 38Basic TheoryEngine TechnologyEngine TechnologyEngine Technology Engine TechnologySlide Number 44Common RailAdvance engine technologyAdvance engine technologyAdvance engine technologyOverviewThe futureOverviewWhat and Why?Road loadRoad loadRoad loadRoad loadPurpose of the gearboxGear conceptGear concept (summary)Gearbox Transmission typeFive speed manual transmissionAutomatic TransmissionCVTDual Clutch TransmissionGearboxHow Car Transmission works Animation / VDO ClipOverviewBugatti Veyron Bugatti VeyronBugatti VeyronBugatti VeyronBugatti VeyronQuestions