Control of an Omnidirectional Vehicle with Multiple Modular Steerable Drive Wheels

Masafumi Hashimoto, Fuminori Oba and Toru Eguchi

Department of Mechanical design engineering, Hiroshima Unversity, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan

Received:

June 3, 1998

Accepted:

November 19, 1998

Published:

February 20, 1999

Keywords:

omnidirectional vehicle, modular vehicle, non-holonomic constraints, wheel module, coordinate motion control, transportation

Abstract

This paper presents a method for controlling an omnidirectional vehicle with multiple modular steerable drive wheels. Each wheel module has two independent drive wheels and a two-degree-of-freedom (2DOF) attachment consisting of an active prismatic joint and a free rotary joint. The attachment enables the wheel module under nonholonomic constraint to move the chassis better omnidirectionally. A controller consisting of vehicle-level and wheel-module controllers is designed to coordinate wheel modules to ensure correct vehicle movement. The vehicle-level controller determines the desired acceleration of the vehicle chassis to track its reference path, and each wheel-module controller controls its own actuator movement to generate the desired acceleration. If the prismatic joint on the wheel module approaches its mechanical limit, the vehicle-level controller corrects the acceleration to keep the joint position within the workspace. Simulation of a vehicle with four wheel modules confirmed the effectiveness of the proposed control.

Cite this article as:

M. Hashimoto, F. Oba, and T. Eguchi, “Control of an Omnidirectional Vehicle with Multiple Modular Steerable Drive Wheels,” J. Robot. Mechatron., Vol.11 No.1, pp. 2-12, 1999.

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