How Does A Car Work?

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# How Does A Car Work - PowerPoint PPT Presentation

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?

Chris Paredis

G.W. Woodruff School of Mechanical Engineering

Georgia Institute of Technology

• 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

Transmission

Engine

Tires

CarBody

Torque Converter

Differential

Four Cycles

Intake

Compression

Combustion

Exhaust

Simplified Engine Model

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

Car Sub-Systems of Interest

Transmission

Engine

Tires

CarBody

Torque Converter

Differential

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 Interest

Transmission

Engine

Tires

CarBody

Torque Converter

Differential

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

sun

planet

ring

morecompact

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 Interest

Transmission

Engine

Tires

CarBody

Torque Converter

Differential

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
• 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
• Wind Resistance:
• Gravitational Force:
• Tire Resistance:

Noise, Vibration,

and Harshness

Thermal

Crash Testing

Examples of Other Models in Vehicle Design

Computational Fluid Dynamics

Stress Analysis