Control device for electric power steering apparatus
First Claim
1. A control device, of an electric power steering system, for controlling a motor for applying a steering assist force to a steering mechanism, the control device comprising:
- a steering assist command value operating section comprising a means for calculating a steering assist command value, based on;
a steering torque generated in a steering shaft; and
an approximation functional expression, which is stored in said steering assist command value operating section, wherein said approximation functional expression is one in which a one-step derived function is continuous; and
a current control section comprising a means for calculating a current control value, based on;
a current value of the motor for applying a steering assist force to a steering mechanism;
said steering assist command value; and
a gain curve, which at least partially possess a gradient exceeding a predetermined value.
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Accused Products
Abstract
A control device which: controls a motor based upon a steering assist instruction value calculated in a steering assist command operating section based upon a steering torque generated in a steering shaft and a current control value calculated from a current value of the motor for applying a steering assist force to a steering mechanism; and at least partially possesses a gradient when a gain curve of characteristics of an entire control system having the steering assist command value as its input exceeds a predetermined value. The steering assist command value operating section is composed of an approximation functional expression in which a one-step derived function is continuous, and the steering assist command value is obtained by calculations based upon the approximation functional expression.
42 Citations
6 Claims
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1. A control device, of an electric power steering system, for controlling a motor for applying a steering assist force to a steering mechanism, the control device comprising:
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a steering assist command value operating section comprising a means for calculating a steering assist command value, based on;
a steering torque generated in a steering shaft; and
an approximation functional expression, which is stored in said steering assist command value operating section, wherein said approximation functional expression is one in which a one-step derived function is continuous; and
a current control section comprising a means for calculating a current control value, based on;
a current value of the motor for applying a steering assist force to a steering mechanism;
said steering assist command value; and
a gain curve, which at least partially possess a gradient exceeding a predetermined value.- View Dependent Claims (2, 3, 4, 5, 6)
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Specification