| 摘要 |
PURPOSE:To improve steering stability of a vehicle by detecting conditions of road surface precisely with simple constitution, and by controlling steering reaction force exactly in accordance with the results of the detection. CONSTITUTION:A microcomputer 34 assumes the yaw rate of a vehicle based on the wheel speeds of non-driven wheels RW1 and RW2 which are detected by wheel speed sensors 31 and 32, and also detects road surface conditions in accordance with deviation of the assumed yaw rate from a yaw rate detected by a yaw rate sensor 33. The micro-computer 34 controls an amount of electric current in an electromagnetic solenoid 17a in accordance with the detected road surface conditions, so that reaction force by a control valve 17 provided with a reaction force mechanism can be large when the vehicle runs on a bad road, such as uneven road, puddly road, and snowy road. |
