Vehicle Steering Assistance Device Synchronizing Tire Angle
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Solution Overview
Problem
Existing steering support control systems for vehicles can cause discomfort to drivers due to a mismatch between the steering wheel state and actual tire angle, leading to excessive torque and discomfort during steering maneuvers.
Innovation Solution
A driving assistance device that uses an electric motor to assist steering by calculating a cooperative drive amount based on both the target tire angle and steering torque, ensuring the tire angle synchronizes with the steering angle, thereby reducing driver discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If steering support control is executed to automatically bring the tire angle close to the target tire angle, then the tire angle can be precisely controlled, but a large torque is applied to the steering wheel causing driver discomfort
Solution Approach 1:
The control system dynamically switches between two modes: when the driver is not steering, the system executes steering support control to precisely control the tire angle; when the driver initiates steering movement, the system transitions to cooperative control that combines target tire angle control with steering torque response, ensuring smooth and comfortable steering operation
Solution Approach 2:
The system continuously monitors steering torque and steering angle to detect driver steering input. When steering torque exceeds a threshold indicating driver steering action, the control mode is adjusted to prioritize driver input while maintaining target tire angle guidance, creating a feedback loop that adapts to driver behavior and prevents excessive torque application
2Extent of automation
If the tire angle is controlled to match the target tire angle through electric motor assistance, then the steering angle can be automatically adjusted, but the steering wheel state becomes different from the actual steering wheel state causing driver discomfort
Solution Approach 1:
The system dynamically adjusts the relationship between steering wheel state and actual steering wheel state based on driver input. During automatic control, the system maintains target tire angle alignment; during driver steering, the system allows the steering wheel state to follow driver input while providing cooperative assistance, ensuring consistency between expected and actual steering behavior
Solution Approach 2:
The system uses steering torque feedback to detect when the driver is steering and adjusts the control strategy accordingly. When driver steering is detected, the system modifies the relationship between steering wheel position and tire angle to maintain consistency with driver intent, preventing the mismatch that causes discomfort
Data Source
AI summary
A control device is applied to a vehicle including a steering device changing a tire angle in synchronization with a change in a steering angle while assisting in steering by driving an electric machine. The control device performs a steering support control for controlling a tire angle and a steering angle by driving the electric machine. The control device includes a control drive amount calculation unit calculating a control drive amount based on the target tire angle in a state where the steering support control is executed. The control device includes a steering drive amount calculation unit calculating a steering drive amount being a drive amount of the electric machine related to a steering torque. The control device includes a control unit that controls the electric machine based on the cooperative drive amount, during steering movement of the driver in a state where the steering support control is executed.