Steering Assistance Control with Road-Cant Torque Correction
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Solution Overview
Problem
Existing vehicle steering systems exhibit left-right differences in turning performance due to manufacturing variations and wear, causing discomfort and reduced security in driving assistance and automatic driving.
Innovation Solution
A steering assistance control apparatus that includes a detection unit to detect road surface cant and a correction unit to adjust steering target torque based on steering characteristics for left and right turns, using a three-dimensional map of traveling speed and road surface cant to minimize these differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steering assistance control is implemented without correction, then the system is simple and easy to manufacture, but left-right differences in turning performance cause discomfort and reduced security
Solution Approach 1:
The system pre-calculates and stores steering characteristic values for various combinations of traveling speed and road surface cant in a table before actual operation. During steering assistance control, the appropriate pre-calculated value is simply looked up and applied, eliminating the need for real-time complex calculations while achieving accurate correction of left-right differences
Solution Approach 2:
The patent replaces complex real-time mechanical adjustment mechanisms with an electronic control system that uses pre-stored characteristic values. The correction is achieved through electronic calculation and control signal adjustment rather than physical mechanical modifications, simplifying the overall system structure
2Measurement precision
If steering target torque is corrected based on multiple parameters (traveling speed, road surface cant, steering characteristic), then steering accuracy is improved, but the detection and measurement complexity increases
Solution Approach 1:
The patent segments the steering characteristic into discrete values corresponding to specific combinations of traveling speed and road surface cant. Instead of attempting to measure and calculate continuous variables, the system divides the operating range into discrete segments with pre-determined characteristic values, simplifying detection and measurement requirements
Solution Approach 2:
The system creates a simplified representation (copy) of the complex steering characteristics in the form of a lookup table with pre-calculated values. This tabular copy contains the essential information needed for correction without requiring the system to reproduce or measure all the underlying physical variables in real-time
Data Source
AI summary
A steering assistance control apparatus to be applied to a vehicle includes a detection unit and a correction unit. The detection unit is configured to detect a road surface cant of a road on which the vehicle is traveling. The correction unit is configured to correct steering target torque in a steering control system, on the basis of a steering characteristic value for each of left steering and right steering and the road surface cant detected by the detection unit. The steering characteristic value indicates a steering characteristic for each combination of a traveling speed and the road surface cant.