Steering Control Device End-Abutting Noise Suppression
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Solution Overview
Problem
Existing turning control systems fail to effectively suppress impact and abnormal noise due to end-abutting in turning mechanisms, even when steering reaction forces are applied, as drivers may still steer against these forces, leading to collisions and noise.
Innovation Solution
A turning control device that includes a first steering angle detection unit, a first actuator, a second steering angle detection unit, a target steering angle calculation unit, a steering angular displacement calculation unit, a steering angle correction value calculation unit, and a steering angle control unit, which work together to calculate and correct the steering angle, ensuring the steering angle aligns with a corrected target, thereby preventing end-abutting and associated noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steering reaction force is applied to suppress end-abutting, then turning angle control is improved, but driver comfort deteriorates because driver may steer against the reaction force
Solution Approach 1:
The control device calculates a corrected target steering angle in advance by subtracting a steering angle correction value from the target steering angle. This preliminary correction ensures that the steering angle does not reach the maximum turning angle even when the driver steers against the reaction force, thereby preventing end-abutting before it occurs.
Solution Approach 2:
The control device uses feedback from steering angle detection units to continuously monitor the actual steering angle and adjusts the target steering angle dynamically. The steering angle correction value is calculated based on the difference between the actual steering angle and the corrected target steering angle, creating a closed-loop control system that adapts to driver actions.
2Reliability
If steering reaction force is applied near maximum turning angle, then turning mechanism control is improved, but impact and abnormal noise are not effectively suppressed
Solution Approach 1:
The control device performs preliminary correction of the target steering angle by subtracting the steering angle correction value before the steering angle reaches the maximum turning angle. This advance correction prevents the steering angle from reaching the critical threshold where impact and abnormal noise would occur, rather than reacting after the problem occurs.
Solution Approach 2:
The control device applies preliminary anti-action by calculating and applying the steering angle correction value in opposition to the potential harmful effect of end-abutting. The corrected target steering angle is deliberately set lower than the maximum turning angle to counteract any driver action that might push the steering angle to the harmful threshold.
Data Source
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AI summary
A turning control device includes: a first actuator (22) configured to drive a turning mechanism; a target steering angle calculation unit (30) configured to calculate a target steering angle of the turning mechanism, based on at least a second steering angle θh of a steering mechanism; a steering angular displacement calculation unit (31) configured to, when a third steering angle, the third steering angle being either a first steering angle θs of the turning mechanism or the second steering angle θh, is in an angular range from a maximum steering angle that the third steering angle can take to a first threshold steering angle, calculate a steering angular displacement θr of the third steering angle with the first threshold steering angle used as a reference; a steering angle correction value calculation unit (32) configured to calculate a steering angle correction value Δθ according to at least the steering angular displacement θr; and a corrected target steering angle calculation unit (33) configured to correct the target steering angle θsr0 with the steering angle correction value Δθ.