Human-friendly control system design for two-wheeled service robot with optimal control approach

Shunichi Sekiguchi, Ayanori Yorozu, Kazuhiro Kuno, Masaki Okada, Yutaka Watanabe, Masaki Takahashi

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


This paper proposes a novel control system design for a two-wheeled service robot that follows a person as an assistant without knowing the person's destination. For this kind of service robot, the key skill is to realize human-friendly movement. However, appropriate motion always changed depending on the situation. For instance, when the robot is close and person turns toward it, it is important to suppress the robot's acceleration. Likewise, if the person turns away from the robot, the robot should maintain its position within an appropriate area. Therefore, to deal with various required movements, our control system is able to change its properties automatically and suitably depending on the situation by using weights of the cost function in nonlinear model predictive control (NMPC) as a function of the relative distance between the person and the robot. Unlike previous methods, our design includes only one controller. Consequently, we are able to take into account system stability. Moreover, owing to proposing in NMPC framework, it is easy to extend our method by adopting other recognition or goal-setting methods. We conducted simulations using actual human walking data taken by the robot's laser range sensors. The experiments demonstrate that the robot can follow a person who performs U-turn, confirming that our method can produce human-friendly robot movement in a practical scene.

Original languageEnglish
Article number103562
JournalRobotics and Autonomous Systems
Publication statusPublished - 2020 Sept


  • Autonomous mobile service robot
  • Human-friendly control system
  • Nonlinear model predictive control

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Software
  • General Mathematics
  • Computer Science Applications


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