Behaviorist-based control of an autonomous skid-steer robot using threshold fuzzy systems

James L. Overholt; K. C. Cheok; G. Edzko Smid

doi:10.1117/12.440007

20 September 2001 Behaviorist-based control of an autonomous skid-steer robot using threshold fuzzy systems

James L. Overholt, K. C. Cheok, G. Edzko Smid

Proceedings Volume 4364, Unmanned Ground Vehicle Technology III; (2001) https://doi.org/10.1117/12.440007
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

Abstract

This paper describes a method of acquiring behaviorist-based reactive control strategies for an autonomous skid-steer robot operating in an unknown environment. First, a detailed interactive simulation of the robot (including simplified vehicle kinematics, sensors and a randomly generated environment) is developed with the capability of a human driver supplying all control actions. We then introduce a new modular, neural-fuzzy system called Threshold Fuzzy Systems (TFS). A TFS has two unique features that distinguish it from traditional fuzzy logic and neural network systems; (1) the rulebase of a TFS contains only single antecedent, single consequence rules, called a Behaviorist Fuzzy Rulebase (BFR) and (2) a highly structured adaptive node network, called a Rule Dominance Network (RDN), is added to the fuzzy logic inference engine. Each rule in the BFR is a direct mapping of an input sensor to a system output. Connection nodes in the RDN occur when rules in the BFR are conflicting. The nodes of the RDN contain functions that are used to suppress the output of other conflicting rules in the BFR. Supervised training, using error backpropagation, is used to find the optimal parameters of the dominance functions. The usefulness of the TFS approach becomes evident when examining an autonomous vehicle system (AVS). In this paper, a TFS controller is developed for a skid-steer AVS. Several hundred simulations are conducted and results for the AVS with a traditional fuzzy controller and with a TFS controller are compared.

Citation Download Citation

James L. Overholt, K. C. Cheok, and G. Edzko Smid "Behaviorist-based control of an autonomous skid-steer robot using threshold fuzzy systems", Proc. SPIE 4364, Unmanned Ground Vehicle Technology III, (20 September 2001); https://doi.org/10.1117/12.440007

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KEYWORDS

Fuzzy systems

Control systems

Sensors

Fuzzy logic

Kinematics

Neural networks

Computer aided design

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