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Vehicle dynamics  (Page 4/2)

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In this module, a physical model of vehicle engine management will be created. The model will be first simulated, and then used to create an implementation on the eZDSP-F2812. This board will emulate in real-time the behavior of a vehicle, under various stimuli. In this example, the environment is used to build a physical model of vehicle engine management in simulation, which is then used to create an implementation on the eZDSP-F2812. This board will emulate in real-time the behavior of a vehicle, under various stimuli.

Introduction

The Texas Instruments C28x family of processors has been designed to implement control applications, for example digital motor control and un-interruptible power supplies. We shall start here with a simple application. In this Laboratory, you will build a simulation model of a vehicle dynamics using Simulink, and then emulate it using the eZDSP-F2812 board.

Related files

Objectives

  • Design a Simulink model of the motion of a vehicle.
  • Run the model using Simulink on a PC.
  • Modify the model for use with the Texas Instruments C28x Digital Signal Processor.
  • Run the modified model on the Texas Instruments F2812 ezDSP.

Level

Beginner; This is intended as the first complete project using Matlab and Simulink.

It is suitable for students who have only limited exposure to Texas Instruments DSPs before.

Requirements

In developing this Laboratory, the following hardware and software were used:

  • Matlab R2006b with Embedded Target for TI C2000.
  • Code Composer Studio (CCS) 3.1.
  • Spectrum Digital ezDSP F2812 Hardware
  • Some external electronic components costing about $2.

Simulation

Running the vehicle dynamics simulation

Open VehicleDynamics.mdl .

Engine Management Subsystem

Run the Model.

The input to the model is a ramp generator, which simulates smooth acceleration.

You will see the graphs of Horsepower and Vehicle Speed.

Changing the vehicle mass

Double click on the “Vehicle Dynamics” block. This models the equation of motion using Simulink Blocks.

Vehicle Dynamics

At present, the vehicle mass is 8000 kg.

We will now simulate a small compact car. Change the 1/m gain block to 1/1000 and change the b/m block to 2/1000.

Run the model again and notice the effect on maximum vehicle speed and how long it takes to reach maximum vehicle speed

You might also like to simulate a 35,000 kg lorry. Change the 1/m block to 1/35000 and b/m to 10/35000.

Changing the engine power profile

Double click on the “Engine Management” block. This models the gas in – horsepower out function of the engine.

Engine Management Subsystem

Double-click on the Power Transfer Function

Engine Power Transfer Function

Change the shape of the Power Transfer Function. You may wish to change the gradient or make the plateau wider. Run the model.

Other modifications to the model

Go to the Website of an automobile manufacture, and obtain the actual engine power transfer function for a real car. Run this in the model.

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
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A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Jude Reply
Can you compute that for me. Ty
Jude
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David Reply
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what is inorganic
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Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
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A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
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you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
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progressive wave
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A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
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Source:  OpenStax, From matlab and simulink to real-time with ti dsp's. OpenStax CNX. Jun 08, 2009 Download for free at http://cnx.org/content/col10713/1.1
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