Feedback Control for a Path Following Robotic Car Part 9 pptx

... Unfor- tunately, the car does not have any data logging and the variables that it calculates as it is driving are not available for analysis. As such, only a qualitative discussion of the car s performance ... get a feel for the controller’s performance, each of these values was hardcoded and the car was allowed to travel around the track. First the curvature was set to zero. The...

Ngày tải lên: 10/08/2014, 02:20

... intelligent transportation system, lateral control, nonholonomic, path following, curvature estimation Copyright 2002, Patricia Mellodge Feedback Control for a Path Following Robotic Car Patricia Mellodge (ABSTRACT) This ... FLASH Images 114 vii Feedback Control for a Path Following Robotic Car Patricia Mellodge Thesis submitted to the Faculty of the Virgi...

Ngày tải lên: 10/08/2014, 02:20

... infrared and magnetic sensors indicate where the path is located directly beneath the car. The camera provides path information about the area in front of the car. The IR, magnetic, and camera ... modulated (PWM) signals. A PWM signal has a fixed frequency and variable duty cycle. The standard PWM signal for servos is shown in Fig. 6.4. It has a pulse width between 1 ms and 2 ms...

Ngày tải lên: 10/08/2014, 02:20

... roadway and several 1/10 scale cars. Each car is capable of operating manually or autonomously. The cars are described in detail in Chapter 6. 2.1.2 Eduational Exhibit Currently, an educational exhibit ... distraction was a factor in 11% of fatal crashes and 25-30% of injury and property- damage-only crashes in 199 9. Viewed from another perspective however, a car capable of driving i...

Ngày tải lên: 10/08/2014, 02:20

... moving the car forwards and backwards and turning the wheels, the car can be placed in the parking space. Ignoring the restrictions caused by external objects, the car can be located at any position ... the variables in (3.10) are known or can be measured, the equation can be solved for c(s). Patricia Mellodge Chapter 3. Mathematical Modeling and Control Algorithm 15 3.2 Control L...

Ngày tải lên: 10/08/2014, 02:20

... the calculated curvature was greater than this threshold, c(s) was set to 1. The car was initially placed so that it was starting on the straight section of the path and oriented so that d and ... α = −0.1 599 and β = 4. 897 5. For filtering, φ was averaged over 10 sample periods. A threshold of 0.5 was used so that if the calculated curvature was less than 0.5, a c(s) value of 0 was...

Ngày tải lên: 10/08/2014, 02:20

... shown using the MATLAB animation toolbox. A flowchart of the program is shown in Fig. 5.1. First, the initialization involves creating the car and path for animation and placing the car on the path. Next, ... Errors are also introduced because this method assumes the roadway is a plane perpendicular to the car s vertical axis. The actual track however, is not flat but contains hil...

Ngày tải lên: 10/08/2014, 02:20

... same as p. Because the rear sensor array is placed directly below the rear axle, the error obtained from that sensor is taken to be d, the car s lateral displacement from the path. 5.2.3 Heading ... Heading Angle Calculation The controller must know the heading angle, θ p , the angle between the car and the path. The value can be calculated using the displacement errors at the front an...

Ngày tải lên: 10/08/2014, 02:20

... straight down at the roadway to determine where the desired path is underneath the car. Patricia Mellodge Chapter 6. Hardware Implementation 63 on the DSP and allows for data to be transmitted and ... a variable for use later. Access to the hardware is done using assembly language functions directly. The assembly language functions are called from C and the bus data gets put into a...

Ngày tải lên: 10/08/2014, 02:20

... Center for Transportation Re- search,” Center for Transportation Research Report, 199 4. [6] P. Kachroo and M. Tomizuka, ”Design and Analysis of Combined Longitudinal Traction and Lateral Vehicle Control ... Estimates System,” DOT HS 8 09 337, U.S. Department of Transportation, National Highway Traffic Safety Administration, National Center for Statistics and Analysis, Washington, DC,...

Ngày tải lên: 10/08/2014, 02:20