Steering Control Device Adaptive Gain Adjustment
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Solution Overview
Problem
Existing steering control devices cause discomfort to drivers due to sudden changes in gear ratios during low-speed driving, and impose a large driving burden during retracting parking maneuvers.
Innovation Solution
A steering control device with an arithmetic logic unit that adjusts the steering angle of wheels by controlling a wheel steering actuator using different gains for turning and returning the steering, thereby optimizing the steering angle ratio and reducing driver burden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If linear gradients are changed at predetermined velocities to adjust gear ratios, then steering angle control is improved, but sudden changes in gear ratios occur causing driver discomfort
Solution Approach 1:
The patent applies dynamics by making the gear ratio change pattern adaptive rather than fixed. The arithmetic logic unit dynamically selects between two different gradient patterns (first and second gradients) based on real-time detection of steering angle direction and vehicle velocity, allowing the system to optimize steering response while avoiding sudden gear ratio changes that cause discomfort.
Solution Approach 2:
The patent changes the parameter of gear ratio gradient based on operating conditions. By detecting steering angle direction (turning vs. returning) and vehicle velocity, the system switches between different gradient parameters (first gradient for turning, second gradient for returning), optimizing steering performance for each phase while preventing abrupt changes.
2Device complexity
If a single gear ratio control pattern is used for both turning and returning steering, then control simplicity is maintained, but driving burden increases during low velocity maneuvers
Solution Approach 1:
The patent segments the steering operation into two distinct phases: turning phase (when steering angle increases) and returning phase (when steering angle decreases). Each phase is controlled with a dedicated gradient pattern (first gradient for turning, second gradient for returning), allowing optimized control for each phase without increasing overall system complexity.
Solution Approach 2:
The system dynamically adapts the gear ratio control pattern based on the detected steering phase and vehicle velocity. During low-velocity returning operations, the second gradient provides more aggressive gear ratio changes to reduce the steering angle required, thereby reducing driving burden without requiring complex mechanical modifications.
Data Source
AI summary
An object of the present invention is to provide a steering control device and a steering control method that can reduce a driving burden imposed on a driver during low velocity driving. The present invention is provided with an arithmetic logic unit that changes a steering angle of a wheel 11 by driving a wheel steering actuator 7 based on a manipulated variable of a steering 3, and calculates a controlled variable of the wheel steering actuator 7. In turning the steering 3, the arithmetic logic unit controls the wheel steering actuator 7 based on a first gain at which a ratio of an actual steering angle of the wheel 11 changes with respect to a steering angle δ, and in returning the steering 3, the arithmetic logic unit controls the wheel steering actuator 7 based on a second gain that differs from the first gain.