Patent ID: 9513124
Filing Date: 2016-12-06
CPC Classification: G01C,G01P

Claim Text:
1. A velocity calculation device comprising: a vertical direction acceleration detection portion that is mounted on a vehicle and detects accelerations in a vertical direction generated correspondingly to undulation of a road surface continuously in succession at a predetermined sampling frequency; a horizontal direction angular velocity detection portion that is mounted on the vehicle and detects angular velocities about a horizontal axis orthogonal to a travel direction of the vehicle generated correspondingly to the undulation of the road surface continuously in succession at the predetermined sampling frequency; and circuitry configured to calculate a succession of velocities in the travel direction of the vehicle on the basis of the accelerations in the vertical direction and the angular velocities about the horizontal axis, wherein the circuitry is configured to calculate a first velocity of the succession of calculated velocities, in which the first velocity is after a second velocity in the succession of calculated velocities, using a predetermined sampling number of data points, from among data points according to the predetermined sampling frequency, about a data point corresponding a position of the vehicle at which the second velocity is calculated, in which the predetermined sampling number of data points is determined according to whether the second velocity is lower than a predetermined velocity.