Abstract: A road surface detecting device has a rotary sensor for detecting the passage of teeth formed in an outer surface of a circular plate at regular intervals, which is connected to an axle of a vehicle and rotates thereabout, and generates an output signal pulsing every time when said teeth pass the rotary sensor. The output signal is inputted to a microcomputer. The microcomputer calculates period variations of the pulsing output signal and an average value of a predetermined number of the period variations. When the average value is not less than a predetermined value, the road surface is determined as being in a bad condition and when the average value is less than the predetermined value, the road surface is determined as being in a good condition; when the average value is less than the predetermined value and the most recently calculating period variation is not less than a predetermined period variation, the road surface is determined as being a rough area on a good road.

Abstract: A drive control device for a seat in a vehicle has a driver entry detection unit, a battery capacity detection unit, a seat drive unit, and a controlling circuit unit for generating a seat drive control signal. The controlling circuit unit has a function of deciding whether or not the capacity of the battery is lower than a predetermined reference value when an entry is detected by the entry detection unit, a function of prohibiting the driving of the seat when the decision of the battery capacity decision function is affirmative, and a function of effecting the driving of the seat when the decision of the battery capacity decision function is negative. The controlling circuit unit can provide a door opening degree monitoring function and a rear monitoring function.

Abstract: A road surface detecting device has a circular plate connected with an axle of a vehicle so as to be rotated with said axle, and has a large number of teeth at regular intervals in its outer periphery. A rotary sensor detecting the passage of the teeth of the circular plate, and generates a pulse signal, and a microcomputer receive the pulse signal. The microcomputer calculates instantaneous speeds of a wheel from the period of the pulse signal and calculates an average value of a plurality of instantaneous speeds obtained in the predetermined rotations of a wheel another average value of a plurality of instantaneous speeds obtained in the next predetermined rotations of a wheel is also calculated as a presumed speed of a vehicle based on one and another average values.

Abstract: In an apparatus for detecting abnormal variation of wheels of a vehicle, a plurality of rotation sensors detect variations in rotation speeds of a plurality of wheels during running of the vehicle. Detection signals produced from the plurality of rotation sensors are converted into arithmetic operation signals by means of a signal converter. An arithmetic operation processor is responsive to the arithmetic operation signals from the signal converter to compute rates of variations in the rotation speeds. The arithmetic operation processor also compares the computed rates of variations with each other to decide whether wheels exist which have a rate of variation abnormally deviating from rates of variations of the other wheels. An alarm unit is responsive to decision signals from the arithmetic operation processor to alert abnormality of the wheels having the abnormally deviating variation rate.