Abstract: An axle load scale with a load signal generation portion having a platform receiving an axle load of a vehicle running for generating a load signal according to the received axle load. The platform being a given size in a running direction of the vehicle and the axle load shows a sinusoidal variation with running of the vehicle The load signal shows a waveform including a top slope reflecting a portion of a waveform of the sinusoidal variation and a net weight of the axle load; a sinusoidal variation prediction portion for predicting the sinusoidal variation from the load signal; and a net axle load prediction portion for predicting and outputting a net axle load value from the predicted sinusoidal variation. The sinusoidal variation prediction portion predicts the waveform of the sinusoidal variation of axle load through detecting a magnitude an inclination of a detected top slope of a pulse of the load signal or the least squaring method.

Abstract: An IC card device capable of transmitting identification data to an inquiring unit without involving interference even when a plurality of IC card devices stay in the vicinity of the inquiring unit over a certain time. As the IC card device approaches the inquiring unit, the field intensity of a signal received by a receiver circuit incorporated in the IC card device increases. When it is determined that the field intensity exceeds a preset threshold level, a reception level determination circuit reads out identification data from a memory. A transmitter circuit transmits repeatedly the identification data signal to the inquiring unit. When the number of times the identification data is transmitted reaches a preset number, a counter stops the transmitting operation of the transmitter circuit.

Abstract: A piezoelectric ceramic vibrator is mounted inside a metal case including a portion adapted for fastening the case to an engine, and the vibrator is adapted to resonate in response to a vibration frequency produced upon knocking of the engine. The output of the vibrator is taken out as a knock output.