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Systems Realization Laboratory How Does A Car Work? Chris Paredis G.W. Woodruff School of Mechanical Engineering Georgia Institute of Technology

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Systems Realization Laboratory Learn More about Cars The graphical material in this lecture is copied from www.howstuffworks.com www.howstuffworks.com You can find much additional information at this web-site

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Systems Realization Laboratory Car Sub-Systems of Interest Torque Converter Engine Transmission Differential Tires Car Body

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Systems Realization Laboratory Engine

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Systems Realization Laboratory Four Cycles IntakeCompressionCombustionExhaust

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Systems Realization Laboratory Simplified Engine Model Use SI units! Torque in [Nm], velocity in [rad/s] and Power in [W]

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Systems Realization Laboratory Car Sub-Systems of Interest Torque Converter Engine Transmission Differential Tires Car Body

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Systems Realization Laboratory Torque Converter

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Systems Realization Laboratory 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.

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Systems Realization Laboratory Car Sub-Systems of Interest Torque Converter Engine Transmission Differential Tires Car Body

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Systems Realization Laboratory Transmission Purpose: provide large power at all vehicle velocities

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Systems Realization Laboratory Transmission more compact sun planet ring

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Systems Realization Laboratory 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.

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Systems Realization Laboratory Car Sub-Systems of Interest Torque Converter Engine Transmission Differential Tires Car Body

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Systems Realization Laboratory Differential

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Systems Realization Laboratory 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.

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Systems Realization Laboratory 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.

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Systems Realization Laboratory Model of the Car Body Wind Resistance: Gravitational Force: Tire Resistance:

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Systems Realization Laboratory Putting It All Together

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Systems Realization Laboratory Examples of Other Models in Vehicle Design Computational Fluid Dynamics Noise, Vibration, and Harshness Crash TestingThermal Stress Analysis

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