Control. CSC752: Autonomous Robotic Systems. Ubbo Visser. March 9, Department of Computer Science University of Miami
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1 Control CSC752: Autonomous Robotic Systems Ubbo Visser Department of Computer Science University of Miami March 9, 2017
2 Outline 1 Control system 2
3 Controller Images from
4 Controller Open loop: Images from
5 Controller Open loop: Feed-forward: Images from
6 Controller Open loop: Feed-forward: Closed loop / feedback: Images from
7 Controller Controller Actuator Effect Feedback
8 Controller Controller Actuator Effect Feedback Measureable output: process variable (PV) Reference: setpoint (SP) System input: manipulated variable (MV) Error e = SP-PV
9 Examples for feedback control Feedback controller can be used to regulate e.g. temperature, pressure, flow rate, speed... Refridgerator Oven temperature Car velocity...
10 Example: Car velocity control Controller for the speed of a car.
11 Example: Car velocity control Controller for the speed of a car. Simple on-off design: Velocity Controller Output Desired Speed Hysteresis to avoid unbounded oscillations. Following slides based on material from jacky/teaching/courses/
12 Example: Car velocity control - Proportional control Controller sets throttle proportional to the output.
13 Example: Car velocity control - Proportional control Controller sets throttle proportional to the output. u(t) = MV (t) = K P e(t), where K P is the controller gain.
14 Example: Car velocity control - Proportional control Controller sets throttle proportional to the output. u(t) = MV (t) = K P e(t), where K P is the controller gain. In the end PV SP, since MV is 0 is for the error 0.
15 Example: Car velocity control - Derivative control Derivative term avoids oscillations of high gains. u(t) = K P e(t) + K D d e(t) dt
16 Example: Car velocity control - Derivative control Derivative term avoids oscillations of high gains. u(t) = K P e(t) + K D d e(t) dt
17 Example: Car velocity control - Integral control Integral term avoids the steady state error. t d e(t) u(t) = K P e(t) + K I e(t)dt + K D dt 0
18 Example: Car velocity control - Integral control Integral term avoids the steady state error. t d e(t) u(t) = K P e(t) + K I e(t)dt + K D dt 0
19 / three term controller t d e(t) u(t) = K P e(t) + K I e(t)dt + K D dt 0 Effects of increasing the gains K P, K I and K D Parameter Rise time Overshoot Settling time Steady state error K P Decrease Increase Small change Decrease K I Decrease Increase Increase Eliminate K D Small change Decrease Decrease Small change Trade off between response time and stability.
20 Problem with s Integral wind-up Physical limits of the actuator let the integral term accumulate a high error.
21 Problem with s Integral wind-up Physical limits of the actuator let the integral term accumulate a high error. What if the controller tries to drive faster than the maximum velocity of the car?
22 Problem with s Integral wind-up Physical limits of the actuator let the integral term accumulate a high error. What if the controller tries to drive faster than the maximum velocity of the car? The error never reaches 0 and the integral term continues to increase. Once the speed is reduced, the integral term will still increase the speed.
23 Example: Car velocity control - Integral wind-up Solution: Max/min values for the integral. Stop summation on saturation.
24 RoboCup examples A humanoid robot can use controllers for several tasks:
25 RoboCup examples A humanoid robot can use controllers for several tasks: Move joint to a given angle.
26 RoboCup examples A humanoid robot can use controllers for several tasks: Move joint to a given angle. Desired joint angle, controller sets voltage, motor moves joint, current joint angle is measured.
27 RoboCup examples A humanoid robot can use controllers for several tasks: Move joint to a given angle. Desired joint angle, controller sets voltage, motor moves joint, current joint angle is measured. Balancing (inverted pendulum).
28 RoboCup examples A humanoid robot can use controllers for several tasks: Move joint to a given angle. Desired joint angle, controller sets voltage, motor moves joint, current joint angle is measured. Balancing (inverted pendulum). Desired torso angle, controller sets walk command, walk motion moves robot, torso angle is measured.
29 RoboCup examples A humanoid robot can use controllers for several tasks: Move joint to a given angle. Desired joint angle, controller sets voltage, motor moves joint, current joint angle is measured. Balancing (inverted pendulum). Desired torso angle, controller sets walk command, walk motion moves robot, torso angle is measured. Walk to position.
30 RoboCup examples A humanoid robot can use controllers for several tasks: Move joint to a given angle. Desired joint angle, controller sets voltage, motor moves joint, current joint angle is measured. Balancing (inverted pendulum). Desired torso angle, controller sets walk command, walk motion moves robot, torso angle is measured. Walk to position. Desired position, controller sets walk command, walk motion moves robot, robot position is measured....
31 Acknowledgement Acknowledgement The slides for this lecture have been prepared by Andreas Seekircher.
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