Patent ID: 6704636
Filing Date: 2004-03-09
Classification: B60C,B60T,G01K

Abstract:
A road surface judgment device, comprising:a vehicle state detecting section for detecting a running state of a vehicle; a road surface friction state estimating section for estimating a road surface friction state of a road surface on which the vehicle is running, on the basis of the running state of the vehicle detected by the vehicle state detecting section; a road surface state measuring section for measuring a road surface state of the road surface on which the vehicle is running, on the basis of the running state of the vehicle detected by the vehicle state detecting section and a controlled state of the vehicle; a referencing section for comparing the road surface friction state with the road surface state to obtain a road surface friction state reference value and a road surface state reference value; a reference value changing section for changing the road surface friction state reference value to the road surface friction state newly estimated by the road surface friction state estimating section when the road surface state newly measured by the road surface state measuring section is the same as the road surface state reference value; and a road surface state judging section for judging the road surface state of the road surface on which the vehicle is currently running, on the basis of the road surface friction state newly estimated by the road surface friction state estimating section and the reference values processed by the reference value changing section.