Motor vehicles – Steering gear – With electric power assist
Patent
1998-04-07
1999-11-30
DePumpo, Daniel G.
Motor vehicles
Steering gear
With electric power assist
180443, 701 42, B62D 404
Patent
active
059925574
ABSTRACT:
An electric power steering apparatus includes a steering assist torque control system in which a steering torque signal is input and a motor speed signal is output. The control system includes a main control value setting section having a gain KTT and setting a target assist torque value corresponding to the steering torque, a differential-value correction value setting section having a gain KTD and setting a differential-value correction value corresponding to a differential steering torque value, a motor having an inertial efficiency JM and a counter electromotive force (induced voltage) constant KE, a motor drive section incorporated in a controlled object and having a proportional gain KP, a steering speed correction value setting section having a gain KTR and setting a steering speed correction value corresponding to the motor speed signal. The ratio of the gain KTD to the gain KTT is set to satisfy the condition: KTD/KTT>JM/{.alpha.(KP.multidot.KTR+KE)} where .alpha.=KT/(R+KP), R is the resistance (winding resistance) of the electric motor, and KT is the torque constant of the electric motor. With this arrangement, the phase of a gain of the steering assist torque control system is advanced, thereby improving the response characteristic to a level at least comparable to the manual steering mechanism.
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Nakamura Yoshito
Shimizu Yasuo
DePumpo Daniel G.
Honda Giken Kogyo Kabushiki Kaisha
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