A connector assembly for detachably connecting a portable hanger to a portable hanger holder includes a first connector member and a second connector member. When a vehicle stop condition is not detected by the detecting means, the determining means does not determine whether or not the child restraint system is equipped on the seat. Since a dependency is indicated on the store, the load is prevented from scheduling andor executing prior to the store. The vibration estimating section estimates the vehicle body vibration from a correlation relationship between displacements in a back-and-forth direction and displacements in an up-and-down direction of the wheels with respect to the vehicle body, and the wheel speed physical quantity detected by the wheel speed physical quantity detecting section. The high-voltage flywheel energy storage system prevents ionization, plasma formation, and electrical are discharge by isolating the motor windings and motor end windings from the partial vacuum environment existing in the flywheel housing. Methods of making same are provided.