Patent ID: 6438472
Filing Date: 2002-08-20
Classification: G01C,G07C

Abstract:
A data recorder, comprising:a media accommodating mechanism for detachably accommodating a recording medium; a sensor unit for measuring, in chronological order, driving speed, three-dimensional angular velocity, and longitudinal/lateral acceleration of a vehicle; and a recorder unit for recording the measurement data obtained from the sensor unit and processed data thereof in the recording medium accommodated in said medium accommodating mechanism, wherein said recorder unit, upon recognizing that a behavior occurs when a variation range of said measurement data exceeds a predetermined threshold, records the measurement data at a time of behavior occurrence and for a predetermined time before and after that time of behavior occurrence; records, according to changes in the driving condition, time and location information at a time of such changes; updates an absolute maximum value when an absolute maximum value of new measurement data exceeds that of already recorded measurement data; and calculates an average value of said measurement data whenever a predetermined period has elapsed, and records the average value together with absolute maximum and absolute minimum values within said predetermined period.