Steering Control Device Speed Suppression for Impact Reduction
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Solution Overview
Problem
In power steering systems, when the movable member approaches the stopper portion, high-speed movement can result in insufficient generation of required torque for damping control, leading to inadequate reduction of impact force upon abutment.
Innovation Solution
A control device, method, and system that perform damping control by outputting a control signal to suppress the speed of the movable member before damping control is initiated, ensuring the generation of necessary torque even at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If damping control is performed immediately before the movable member abuts on the stopper portion, then impact force reduction is achieved, but when the moving speed is high, the required torque exceeds limit torque corresponding to motor rotation speed and cannot be generated
Solution Approach 1:
The control device performs preliminary speed suppression before damping control is initiated. When the moving speed of the movable member is high, the control device outputs a control signal to suppress the speed before the damping control that generates required torque is performed, ensuring the motor can generate the necessary torque for effective impact force reduction.
Solution Approach 2:
The control device applies preliminary anti-action by suppressing the moving speed before the harmful impact occurs. By reducing the speed prior to the damping control phase, the system prevents the condition where required torque would exceed limit torque, thereby ensuring reliable impact force reduction.
2Productivity
If the moving speed of the movable member is high, then productivity is improved, but the required torque for damping control exceeds limit torque corresponding to motor rotation speed
Solution Approach 1:
The control device dynamically adjusts the moving speed based on the operational phase. During the approach phase to the stopper portion, the control device suppresses speed when it is high, allowing the motor to operate within its torque capabilities during damping control, while still permitting high speeds during normal operation to maintain productivity.
Solution Approach 2:
The control device changes the speed parameter dynamically. When the moving speed is detected to be high, the control device outputs a control signal to suppress the speed before damping control is performed, thereby changing the operating parameters to match the motor's torque-generation capabilities while maintaining high productivity during non-critical phases.
Data Source
AI summary
A control device, a control method, and a control system according to the present invention perform damping control of buffering movement of a movable member immediately before the movable member abuts on a stopper portion, and when a moving speed of the movable member satisfies a predetermined condition, output a control signal for suppressing a speed of the movable member before the damping control is performed. As a result, in a steering mechanism that includes a motor applying torque to a movable member relating to steering, and a stopper mechanism including a stopper portion that can abut on the movable member and limiting a moving range of the movable member, impact force when the movable member abuts on the stopper portion can be reliably reduced.