| 摘要 |
PROBLEM TO BE SOLVED: To secure the gripping forces of tires to effectively actuate a brake assist device in a vehicle having a brake assist system for use in emergencies by restraining excessive steering in an emergency, as when an obstacle should be avoided with the vehicle speed low. SOLUTION: When vehicle speed is smaller than a predetermined vehicle speed and the steering angular velocity of a steering wheel is smaller than a predetermined angular velocity, a controller 40 controls an assist device 66 for power steering to reduce its assist force, and turns an alarm buzzer on. When the steering angular velocity of the steering wheel is not smaller than the predetermined angular velocity, that is, when an obstacle or the like cannot be avoided while the assisting force produced by the assist device 66 is kept small, then control using the normal assist device 66 is restored to allow the driver to steer the vehicle comfortably, rapidly, and greatly.
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