| 摘要 |
PURPOSE:To discriminate undulations in a friction factor on a road surface, by comparing the vehicle deceleration detected under the specified condition with another vehicle deceleration which serves as the criterion conformed to the friction factor on the road surface prepared in advance. CONSTITUTION:When a vehicle comes to more than the specified decelerated state producing a slip between a road surface and a braked wheel, a control signal out of an ABS computer 37 is inputted into a decelerated state detecting element 40 as an ABS actuating signal, whereby a detection signal is outputted to a ground deceleration detecting element 41. Here, ground deceleration of a vehicle is detected on the basis of a pseudo-car speed VR to be secure as an input signal out of the computer 37. This value is compared with the value alphaof reference ground deceleration to be stored in a memory part 42 at a discriminating part 43. In this memory part 42, the vehicle reference ground deceleration conformed to the value of a friction factor of at least one road surface is stored by an experiment or the like. Therefore, undulations in the friction factor on the road surface can be discriminated from the value of the vehicle ground deceleration. |
