Curve Road Steering Assist Torque Control
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Solution Overview
Problem
Existing vehicle drive control systems are limited in their ability to assist vehicles in maintaining lane keeping and turning on curve roads, particularly when lane detection becomes unreliable, leading to sudden changes in steering assist torque that can discomfort drivers and reduce assist performance in sharp curves.
Innovation Solution
A vehicle drive control device that includes a drive lane detector, a drive assist unit, and a curve road steering assist unit, which calculates and applies a combination of steering assist torques to maintain lane keeping and assist in turning on curve roads, using a decrease limiter to gradually reduce steering assist when lane detection fails, ensuring a smoother transition and improved assist performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drive assist control is discontinued when lane detection becomes unreliable, then the system avoids acting on incorrect lane information, but steering assist torque changes suddenly causing driver discomfort and reduced assist performance in curve roads
Solution Approach 1:
The system performs preliminary action by switching to curve road steering assist control before completely discontinuing drive assist control. When lane detection reliability deteriorates, the system proactively transitions to a mode that maintains steering assist based on curvature information, preventing sudden torque changes and driver discomfort while avoiding reliance on unreliable lane detection
Solution Approach 2:
Curvature information serves as an intermediary between lane detection and steering assist control. When lane detection becomes unreliable, the system uses curvature information (which remains reliable) to calculate steering assist torque, acting as a mediator that maintains smooth steering assistance without depending on the failed lane detection
2Reliability
If drive assist control is discontinued when lane detection fails, then the system avoids using incorrect lane information, but the application range of steering assist torque is limited and performance in sharp curves is reduced
Solution Approach 1:
The system achieves universality by making the curve road steering assist control applicable in multiple scenarios: both when lane detection is reliable and when it becomes unreliable. The curvature-based steering assist can serve as either the primary control mode or a fallback mode, expanding the application range of steering assist torque across different driving conditions and detection reliability levels
Solution Approach 2:
The system changes the control parameter from lane-based steering assist to curvature-based steering assist when detection reliability deteriorates. By switching from using lane detection results to using curvature information, the system maintains steering assist functionality in sharp curves and diverse road conditions where lane detection may fail
3Speed
If steering assist torque is suddenly adjusted when switching control modes, then the system responds quickly to lane detection failures, but driver discomfort increases and assist performance is reduced
Solution Approach 1:
The system applies dynamics by continuously adjusting steering assist torque based on current driving conditions and detection reliability, rather than making abrupt static changes. The curvature-based steering assist control dynamically adapts to the vehicle's turning state, maintaining smooth torque application even during rapid transitions between control modes, thereby reducing driver discomfort while preserving quick response capability
Data Source
AI summary
A vehicle drive control device includes a drive lane detector, a drive assist unit, and a curve road steering assist unit. The drive lane detector detects a drive lane of a subject vehicle. The drive assist unit performs drive assist control to assist the subject vehicle in lane keep driving in the drive lane. The curve road steering assist unit performs steering assist for assisting the subject vehicle in turning along a curve of a curve road if the drive lane is the curve road and if the drive assist control performed by the drive assist unit is discontinued during driving on the curve road.