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Wheel-legged mobile robots (i.e., robots that use leg and wheel mechanisms) have the potential for efficient movement in response to the environment. Singular configuration is an inevitable problem in wheel-legged mobile robots and must be solved to realize motion. This paper proposes a simplification of the motion generation method in the singular configuration of a wheel-legged mobile robot. The problem of inverse kinematic calculations in a wheellegged mobile robot is first modeled, and a solution method is proposed using an extension of the constraints to the acceleration level and the redundancy of the robot. The singular configuration problem in the low-speed region is then solved using the Levenberg–Marquardt method. A simple decision method using a weighted matrix for the damping factor is also proposed. The method is then verified using a three-dimensional simulation and an experiment.

Simplification of Motion Generation in the Singular Configuration of a Wheel-Legged Mobile Robot