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How Does A Car Work?. Chris Paredis G.W. Woodruff School of Mechanical Engineering Georgia Institute of Technology. Learn More about Cars. The graphical material in this lecture is copied from www.howstuffworks.com You can find much additional information at this web-site.

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how does a car work

How Does A Car Work?

Chris Paredis

G.W. Woodruff School of Mechanical Engineering

Georgia Institute of Technology

learn more about cars
Learn More about Cars
  • The graphical material in this lecture is copied from www.howstuffworks.com
  • You can find much additional information at this web-site
car sub systems of interest
Car Sub-Systems of Interest

Transmission

Engine

Tires

CarBody

Torque Converter

Differential

four cycles
Four Cycles

Intake

Compression

Combustion

Exhaust

simplified engine model
Simplified Engine Model

Use SI units! Torque in [Nm], velocity in [rad/s] and Power in [W]

car sub systems of interest1
Car Sub-Systems of Interest

Transmission

Engine

Tires

CarBody

Torque Converter

Differential

torque converter1
Torque Converter
  • The model of a torque converter is fairly complex and highly nonlinear
  • We will not consider it in this class.

If you need it, it will be provided to you as a Matlab function.

car sub systems of interest2
Car Sub-Systems of Interest

Transmission

Engine

Tires

CarBody

Torque Converter

Differential

transmission
Transmission
  • Purpose: provide large power at all vehicle velocities
transmission1
Transmission

sun

planet

ring

morecompact

model of a transmission
Model of a Transmission
  • Assumptions:
    • No friction or other losses
    • No inertia
  • Reduces the rotational velocity:
  • Increases the torque

where n is the transmission ratio and subscript in refers to the shaft connected to the torque converter.

car sub systems of interest3
Car Sub-Systems of Interest

Transmission

Engine

Tires

CarBody

Torque Converter

Differential

model of a differential same as transmission
Model of a Differential – Same as Transmission
  • Assumptions:
    • Car drives in a straight line
    • No friction or other losses; no inertia
  • Reduces the rotational velocity:
  • Increases the torque

where n is the transmission ratio and subscript in refers to the shaft connected to the transmission.

model of a wheel
Model of a Wheel
  • Assumptions:
    • Car drives in a straight line
    • No slip; no tire deformation; no friction losses; no inertia
  • Converts rotational velocity into translational velocity:
  • Converts torque into force:

where R is the radius of the wheel.

model of the car body
Model of the Car Body
  • Wind Resistance:
  • Gravitational Force:
  • Tire Resistance:
examples of other models in vehicle design

Noise, Vibration,

and Harshness

Thermal

Crash Testing

Examples of Other Models in Vehicle Design

Computational Fluid Dynamics

Stress Analysis

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