Intersection Steering Reaction Force Using Guide Steering Angle
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Solution Overview
Problem
Existing vehicle driving assist devices struggle to apply a steering reaction force that allows smooth steering operations when a vehicle approaches an intersection with multiple possible turn options, as they cannot determine the appropriate curvature radius for the intended turn.
Innovation Solution
A vehicle driving assist device that acquires the size of the intersection and sets a guide steering angle based on this size, controlling the steering reaction force to match the driver's intended turn, even when multiple turn options are available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vehicle driving assist device controls steering reaction force based on curvature radius of a curved road, then the driver can easily turn the steering wheel on sharply curved roads, but the device cannot determine the curvature radius when there are multiple possible roads at an intersection
Solution Approach 1:
The patent introduces an intersection size as an intermediary parameter to indirectly represent the curvature radius of the intended road. When multiple roads are possible, the device uses the intersection size (acquired from map data or sensors) as a mediator to estimate the curvature radius, allowing the steering reaction force control to function even when direct curvature radius measurement is impossible.
Solution Approach 2:
The device acquires intersection size information in advance before the vehicle actually enters the turning road. By preparing the curvature radius estimation based on intersection size beforehand, the system ensures that steering reaction force control can be immediately applied when the driver intends to turn, without waiting for actual road curvature detection.
2Ease of operation
If the device cannot determine the curvature radius at intersections with multiple roads, then steering reaction force control cannot be applied, but the driver needs assistance to smoothly turn at intersections
Solution Approach 1:
The intersection size serves as a reliable intermediary parameter that can be determined with high confidence using map data, even when multiple roads are possible. This intermediary measurement enables the steering reaction force control system to operate reliably at intersections by substituting for the unavailable direct curvature radius measurement of the intended road.
Solution Approach 2:
The intersection size parameter serves multiple functions: it represents the curvature radius of the intended road, provides basis for steering reaction force control, and works universally for all intersection scenarios regardless of how many possible roads exist. This multi-functional parameter ensures reliable steering assistance across diverse intersection situations.
3Ease of operation
If the device uses intersection size to set guide steering angle, then steering reaction force can be controlled at intersections, but the device must identify which specific road the driver intends to enter
Solution Approach 1:
The device monitors the driver's actual steering operations and provides feedback to identify the intended road. By comparing the guide steering angle (calculated from intersection size) with the actual steering angle, the system receives feedback on which road the driver intends to enter, enabling dynamic adjustment of steering reaction force without requiring complex pre-identification of the intended road.
Solution Approach 2:
The system dynamically adapts to the driver's intended road by continuously monitoring steering operations. Rather than requiring static identification of the intended road before control begins, the device allows the steering reaction force control to evolve dynamically as the driver's intentions become clear through actual steering movements, reducing the complexity of road identification.
Data Source
AI summary
A vehicle driving assist device includes a processor that controls a steering reaction force to be applied to a steering operation performed by a driver of a vehicle. The processor acquires a size of an intersection when the driver intends the vehicle to turn right or left at the intersection. The processor sets a steering angle of the vehicle necessary for the vehicle to turn right or left at the intersection as a guide steering angle based on the size of the intersection. The processor controls the steering reaction force based on a difference between the guide steering angle and an actual steering angle.