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Tb reduce the collision shock and iniury risk to an infant in a child car bed (or child safety bed or in-car crib) during a car crash, it is necessary to keep the force acting on the bed constant and below a certain allowable value. To this end, we propose a semi-active child car bed with joint application of regular and inverted pendulum mechanisrns. The bed is supported like a pendulum by arms, and the pendulum system is supported 1ike an inverted pendulum by arms, This system not only reduces the impulsive force but also transfers the force to the infant's back using a spin control system, i.e., the force acts perpendicularly on the bed. The spin control system was developed previously. In the present study, an acceleration control system is developed. One of the characteristics is that this system has the merits of both a regular pendulum-style child car bed and an inverted pendulum-style child car bed. The regular pendulum-style one is suitable when moderate impulsive forces are involved because the bed rnoves smoothly soen after the force begins to affect the bed. The inverted pendulum-styIe one is suitable when large impulsive forces are involved because the arm that is initially tilted backward, which constitutes the inverted pendulum, is difficult to move under weak forces. Therefore, the proposed child car bed is able to increase the acceleration ofthe bed gradually and maintain it around the target value. This paper focuses on the control system. The control law is introduced, and the robustness is examined using numerical simulation,

D41 Basic Research on Semi-Active Child-Car Bed with Joint Application of Regular and Inverted Pendulum Mechanisms : Study on the Control System