Patent ID: 7603213
Filing Date: 2009-10-13
Classification: G07C

Abstract:
1. An in-vehicle device for detecting a driving condition of an automotive vehicle, the in-vehicle device being part of a navigation device, comprising: a first sensor for detecting one of acceleration of the vehicle and angular speed of the vehicle, wherein the angular speed is defined around a predetermined axis of the vehicle; a second sensor for detecting one of the acceleration of the vehicle and the angular speed of the vehicle; a first determination unit for determining whether a first detection signal from the first sensor is varied with a first frequency equal to or larger than a predetermined first determination frequency and with a first variation amount larger than a predetermined first variation threshold; a second determination unit for determining whether a second detection signal from the second sensor is varied with a second frequency equal to or larger than a predetermined second determination frequency and with a second variation amount larger than a predetermined second variation threshold; and a vibration noise removal unit for determining that a vibration noise caused by vertical vibration of the vehicle is superimposed on each detection signal of the first and second sensors when both of the first and second determination units determine that each detection signal is varied with the frequency equal to or larger than the determination frequency and with the variation amount larger than the variation threshold, wherein the vibration noise removal unit removes the vibration noise from each detection signal when the vibration noise removal unit determines that the vibration noise is superimposed on each detection signal, and the vibration noise is defined by the determination frequency and the variation threshold, wherein the in-vehicle device is a part of a navigation device.