Abstract: A change of performance of an electromagnetic suspension unit is detected. When an integral ?|Vs??Vs*| of an absolute value of a difference between an actual value Vs* and an estimated value Vs? of an expansion/contraction velocity of a shock absorber is larger than a performance change threshold value Sth, it is detected that the performance of the electromagnetic suspension unit is changed. Further, when an integral ?|Vs*| of an absolute value of the actual value Vs* is larger than an integral ?|Vs?| of an absolute value of the estimated value Vs? by a predetermined value, performance of the shock absorber is changed such that a damping force of the shock absorber is reduced. Thus, the performance change of the electromagnetic suspension unit is detected based on the expansion/contraction velocity of the shock absorber.

Abstract: A change of performance of an electromagnetic suspension unit is detected. When an integral ?|Vs??Vs*| of an absolute value of a difference between an actual value Vs* and an estimated value Vs? of an expansion/contraction velocity of a shock absorber is larger than a performance change threshold value Sth, it is detected that the performance of the electromagnetic suspension unit is changed. Further, when an integral ?|Vs*| of an absolute value of the actual value Vs* is larger than an integral ?|Vs?| of an absolute value of the estimated value Vs? by a predetermined value, performance of the shock absorber is changed such that a damping force of the shock absorber is reduced. Thus, the performance change of the electromagnetic suspension unit is detected based on the expansion/contraction velocity of the shock absorber.

Abstract: An information processing system capable of performance measurement by the use of a small amount of mounted hardware. The information processing system having central processors installed therein comprises a control circuit, and a performance measurement validation register for specifying whether a performance measurement function is valid or invalid. In a case where the validity of the measurement function has been specified by the register, the control circuit operates one loop in a duplex configuration as a performance measurement facility. At this time, counter #1-counter #3 are used as counters for totalizing performance information. On the other hand, in a case where the invalidity of the measurement function has been specified, both loops in the duplex configuration are operated as the central processors. At this time, the counter #1-the counter #3 are used as timer counters for controlling buses.