Driving Assist System Steering Torque Course Correction
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Solution Overview
Problem
Conventional driving assist systems sometimes correct the vehicle's course even when the driver is not concerned, leading to driver discomfort.
Innovation Solution
A driving assist system that detects steering operation input values and corrects the target course only when necessary, considering the driver's psychological state by adjusting the correction amount based on the steering operation and positional relationships with objects near the lane, and also takes into account the driver's line of sight to prevent unnecessary corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target course is corrected to avoid obstacles outside the lane, then the safety is improved, but the driver comfort deteriorates due to unnecessary corrections when the driver is at ease
Solution Approach 1:
The system uses steering operation input value as feedback to determine whether course correction is necessary. When the driver performs steering operations within a predetermined range, the system judges that the driver is at ease and suppresses automatic course correction, thereby avoiding unnecessary interventions that would cause discomfort while maintaining safety when needed
Solution Approach 2:
The system changes the parameter of target course correction based on the steering operation input value. By monitoring whether the steering input exceeds a predetermined threshold, the system dynamically adjusts whether to apply course correction, enabling it to distinguish between drivers who are at ease and those who are concerned about obstacles
2Manufacturing precision
If the target course is corrected frequently to maintain lane position, then the lane keeping accuracy is improved, but the driver discomfort increases due to excessive corrections
Solution Approach 1:
The system applies partial action by selectively correcting the target course only when necessary. Instead of continuously correcting to maintain perfect lane position, the system suppresses correction when the driver is at ease (steering input within threshold), accepting slight position variations to avoid excessive corrections that would discomfort the driver
Data Source
AI summary
A driving assist system assists steering such that a vehicle travels along a set target course. A steering torque sensor detects a steering torque that serves as a steering operation input value generated by a driver. If the steering torque value is equal to or greater than a preset reference value and a direction corresponding to the steering torque is a direction away from another vehicle present ahead in an adjacent lane, then an ECU corrects the target course to a course that moves away from the other vehicle.