Steering Assist Device Curve Entrance Response
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Solution Overview
Problem
Conventional steering assist devices experience delays in steering wheel turning at curve entrances, causing the vehicle to deviate from the path and discomfort for the driver.
Innovation Solution
A steering assist device that determines when a vehicle is approaching a curve entrance and relaxes the steering target value change restrictions, increasing the steering amount to improve path-following capability by matching the curve direction with the driver's steering direction and adjusting the curvature change rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the steering target value change restriction is strictly controlled, then the steering control stability is improved, but the steering response delay occurs at curve entrances
Solution Approach 1:
The patent applies dynamics by making the steering target value change restriction dynamic rather than static. The restriction is adjusted based on the detected curve entrance condition, allowing the system to transition between restrictive and permissive states. This resolves the contradiction by enabling fast response when needed (at curve entrances) while maintaining stability during normal conditions.
Solution Approach 2:
The patent changes the parameter of steering target value change restriction based on the detected traveling path conditions. When a curve entrance is detected, the restriction parameter is modified to allow larger changes, thereby improving steering response speed without compromising overall control stability.
2Manufacturing precision
If the steering amount is increased at curve entrances, then the path-following capability is improved, but the steering control complexity increases
Solution Approach 1:
The patent applies local quality by implementing different steering control characteristics for different locations on the traveling path. Specifically, the steering target value change restriction is relaxed only at curve entrances while maintaining strict control elsewhere. This localized adjustment improves path-following precision at critical points without unnecessarily increasing overall system complexity.
Solution Approach 2:
The patent uses preliminary action by detecting curve entrances in advance and proactively adjusting the steering target value change restriction before the vehicle actually enters the curve. This allows the steering system to prepare for the upcoming maneuver, improving path-following capability while keeping the control logic relatively simple through event-driven adjustments.
Data Source
AI summary
An object of the present invention is to provide a steering assist device which can perform steering assist control having excellent capability to follow up a traveling path by increasing the steering amount in the steering control at a curve entrance. A steering assist device of the present invention is a steering assist device 1 for calculating a steering target value based on a shape of a traveling path on which a vehicle travels, and assisting steering according to the steering target value, wherein it is determined whether the vehicle is traveling a curve entrance of the traveling path, and when it is determined that the vehicle is traveling a curve entrance, a change in the steering target value is increased compared with the case of traveling a part of the path other than a curve entrance. As a result, a steering amount to turn the steering wheel can be increased at a curve entrance, and a delay in the turning of the steering wheel at a curve entrance can be suppressed.