| 摘要 |
PROBLEM TO BE SOLVED: To secure a good running stability for a vehicle certainly and effectively even in case the tire air pressure of a wheel drops to lead to a reduction of the vertical load of the wheel. SOLUTION: The reference value Pwtei for judging the drop of the tire air pressure is calculated on the basis of the dropping rate RPwti of the tire air pressure (S20 and 30), and for each wheel, discrimination is made for whether any wheel exists whose tire air pressure is dropped according to the discrimination whether the tire air pressure Pwti is lower than the reference value Pwtei (S40), and if the tire air pressure of any wheel is dropped, the control gain Kct is calculated according to the dropping degree of the tire air pressure (S60), followed by reducing the vertical load of the wheel whose tire air pressure is dropped (S100), and then a control is made for the steering gear ratio (S200), the steering assist force (S300), and distribution of the braking/driving force (S400) so that a change in the steering characteristic resulting from a change in the vertical load is reduced. COPYRIGHT: (C)2007,JPO&INPIT |
