To provide a steering gear for a vehicle capable of estimating the mental state of a driver, and reflecting the estimated mental state to steering characteristics.
An electronic controlling unit 35 obtains a steering angle θ, the stroke amount a of an accelerator pedal, and the stroke amount b of a brake pedal from a steering angle sensor 31, an accelerator pedal sensor 71, and brake pedal sensor 72. The unit 35 calculates acceleration θ", a", and b" of each operation from the obtained detection value, and estimates a mental state change of the driver by comparing the calculated values with operation determining threshold values St, At, and Bt. By this estimation, when the mental state of the driver changes to a state wanting to hurry, steering characteristics is changed to a map Hq having high steering responsibility to the steering of the driver, namely quick steering characteristics. Therefore, the moving state of the vehicle faithful to an intention of the driver can be obtained.
KUROSAWA RYUICHI
TOUTSU KENJI
YAMADA DAISUKE
AISIN SEIKI
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