| 摘要 |
PROBLEM TO BE SOLVED: To effectively reduce the deterioration of tires and further suppress a decrease in tire internal air pressure while preventing a variation in the steering characteristic of a vehicle. SOLUTION: It is determined whether or not the tire internal air pressure Pwti is lower than a reference value Pwtei calculated based on a tire internal air pressure drop rate RPwti, so that it may be determined whether or not the tire air pressure is decreased (S20 to 40). When one of the tire internal air pressures of wheels is decreased, a reduction degree of the tire internal air pressure and a required travel distance L to reach a position where the vehicle can be safely stopped are calculated by a navigation system 60, and a control gain Kct is calculated corresponding to the required traveling distance L (S100). The control amount of steering gear ratio control for controlling a change in the steering characteristic of the vehicle caused by the ground contact load reduction control of the wheels in which the tire internal air pressure is decreased and the change of the ground contact load is increased and decreased corresponding to the control gain Kct (S200, 300). COPYRIGHT: (C)2007,JPO&INPIT |
