Patent ID: 9233672
Filing Date: 2016-01-12
CPC Classification: B60T

Claim Text:
1. A control system in a straddle-type vehicle configured to rotate a drive wheel by a driving power generated in a driving power source mounted in the vehicle, comprising: a slip value measuring unit configured to measure a slip value indicating an extent to which the drive wheel spins by: a change rate calculator configured to calculate a change rate of the slip value measured by the slip value measuring unit, the change rate being a change rate of the slip value per unit time; a road surface condition determiner configured to determine a road surface condition according to the change rate of the slip value calculated by the change rate calculator, wherein the road surface condition determiner is configured to determine that a friction coefficient of the road surface condition decreases as the change rate increases, the friction coefficient of the road surface condition increases as the change rate decreases, and to decide an output value indicating the road surface condition based on a plurality of instant values indicating the road surface condition which are obtained at different time points; and wherein the road surface condition determiner chooses as the output value, a road surface condition selected from a plurality of predetermined road surface conditions, based upon a maximum value of the change rate of the slip value obtained within a predetermined time period back from a time point when a latest value indicating a latest result of the determination of the road surface condition is obtained.