Physical amount estimating apparatus, road surface friction condition estimating apparatus, steering angle neutral point estimating apparatus and air pressure reduction estimating apparatus

A physical amount estimating apparatus comprising:

• first outputting means for outputting a first physical amount that does not include a hysteresis characteristic;
• second outputting means for outputting a second physical amount that has a predetermined physical relationship to the first physical amount and includes a hysteresis characteristic;
• hysteresis removing means for calculating a corrected value with the hysteresis characteristic removed therefrom, based on the second physical amount;
• and
• estimating means for estimating a third physical amount based on a physical relationship between the first physical amount and the corrected value, wherein:
• the first physical amount is a physical amount related to a steering state of a steered wheel;
• the second physical amount is an estimated value of a self aligning torque estimated from a steering torque and an assist torque;
• the corrected value is a corrected value of the self aligning torque calculated from the estimated value of the self aligning torque;
• and
• the third physical amount is a physical amount related to one of a wheel state and a road state while a vehicle is driven.