Electric power steering apparatus
First Claim
1. An electric power steering apparatus comprising:
- a motor for applying a steering assist torque to a steering system connecting a steering wheel to turning vehicle wheels; and
a control unit having an overload preventing part for decreasing a current supplied to the motor when a state such that the steering torque acting on the steering system exceeds a predetermined value and a steering speed of the steering system is below a predetermined value has continued for a preset time.
1 Assignment
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Accused Products
Abstract
A control unit of an electric power steering apparatus has an overload preventing part having the function of decreasing the current supplied to a motor of the electric power steering apparatus when a state such that a steering torque acting on the steering system is above a predetermined value and the steering speed of the steering system is below a predetermined value has continued for a predetermined time or having the function of immediately decreasing the current supplied to the motor when the steering speed of the steering system is below a predetermined value and the steering torque acting on the steering system is above a first predetermined value and decreasing the current supplied to the motor when a state such that the steering speed is below a predetermined value and the steering torque is above a second predetermined value smaller than the first predetermined value has continued for a predetermined time. As a result, a stable steering assist torque can be supplied from the motor even when a steering operation is carried out slowly and an excessive current is not continuously supplied to the motor when the steering system has reached a maximum steering angle position.
144 Citations
6 Claims
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1. An electric power steering apparatus comprising:
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a motor for applying a steering assist torque to a steering system connecting a steering wheel to turning vehicle wheels; and a control unit having an overload preventing part for decreasing a current supplied to the motor when a state such that the steering torque acting on the steering system exceeds a predetermined value and a steering speed of the steering system is below a predetermined value has continued for a preset time. - View Dependent Claims (2, 3)
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4. An electric power steering apparatus comprising:
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a motor for applying a steering assist torque to a steering system connecting a steering wheel to turning vehicle wheels; and a control unit having an overload preventing part for immediately decreasing a current supplied to the motor when a steering speed of the steering system is below a predetermined value and the steering torque acting on the steering system exceeds a first predetermined value and decreasing the current supplied to the motor when a state such that the steering speed of the steering system is below a predetermined value and the steering torque acting on the steering system exceeds a second predetermined value smaller than the first predetermined value has continued for a preset time. - View Dependent Claims (5, 6)
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Specification