Steering Assistance Device for Collision Avoidance
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Solution Overview
Problem
Existing steering assistance devices cause uncomfortable feelings in drivers due to unintended vehicle direction changes during collision avoidance assistance, as they either do not generate a steering force or generate excessive force, leading to interference with the driver's intended steering.
Innovation Solution
A collision avoidance assistance system using a first steering assistance system that does not generate a reaction force and a second system that does, with the first system providing a larger control amount initially to minimize interference and gradually transitioning to the second system to generate a reaction force, thereby reducing driver discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a steering assistance system generates a reaction force against the steering wheel, then the driver can recognize the steering assistance and intended direction, but the driver may feel uncomfortable due to interference with the driver's intended steering
Solution Approach 1:
The steering assistance system is divided into two independent subsystems: a first steering assistance system that provides steering force without reaction force, and a second steering assistance system that provides steering force with reaction force. This segmentation allows the system to separately optimize for different functions - the first system ensures smooth steering without driver discomfort, while the second system provides directional feedback to the driver.
Solution Approach 2:
The system dynamically adjusts the control amounts from the first and second steering assistance systems based on the steering wheel angle and driver input. The control amount from the first system is set to be larger than the second system during an initial predetermined time period, then gradually transitioned to balance both systems. This dynamic adjustment resolves the contradiction by initially prioritizing comfort and then incorporating driver feedback.
2Object-affected harmful factors
If the steering assistance system does not generate a reaction force against the steering wheel, then the driver does not feel uncomfortable, but the driver cannot recognize the steering assistance operation
Solution Approach 1:
The steering assistance system is divided into two independent subsystems: a first steering assistance system that provides steering force without reaction force, and a second steering assistance system that provides steering force with reaction force. This segmentation allows the system to separately optimize for different functions - the first system ensures smooth steering without driver discomfort, while the second system provides directional feedback to the driver.
Solution Approach 2:
The patent combines the outputs of the first and second steering assistance systems to produce the total steering force applied to the steering wheel. By merging both systems, the patent achieves both comfort (from the first system) and driver recognition (from the second system), resolving the contradiction between these two requirements.
3Reliability
If the system operates during driver steering operation, then collision avoidance can be assisted, but the direction of the vehicle may change in excess or opposite to the driver's intended steering
Solution Approach 1:
The system uses feedback from the steering wheel angle sensor and driver steering operation to dynamically adjust the control amounts from both steering assistance systems. The feedback mechanism ensures that the system operates smoothly during driver steering operations, preventing excessive or opposite direction changes while maintaining collision avoidance assistance functionality.
Solution Approach 2:
The system dynamically adjusts the control amounts from the first and second steering assistance systems based on the steering wheel angle and driver input. The control amount from the first system is set to be larger than the second system during an initial predetermined time period, then gradually transitioned to balance both systems. This dynamic adjustment resolves the contradiction by initially prioritizing comfort and then incorporating driver feedback.
Data Source
AI summary
A collision avoidance assistance device includes a target control amount calculation unit configured to calculate a target control amount used for travelling on a target trajectory through which the vehicle passes, a first control amount calculation unit configured to calculate a first control amount to be applied by the first steering assistance system out of the target control amount, and output the first control amount to the first steering assistance system, and a second control amount calculation unit configured to calculate a second control amount to be applied by the second steering assistance system out of the target control amount, and output the second control amount to the second steering assistance system. The first control amount is set to be larger than the second control amount during a predetermined time period from a time of starting the collision avoidance assistance.