Vehicle Chassis Control Using Acceleration-Based Driving Style Evaluation
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Solution Overview
Problem
Existing vehicle control systems struggle to reliably assess driving style, leading to inaccurate judgments and mode switching, particularly due to the inability to distinguish between different driving scenarios such as high-speed cornering and parking maneuvers.
Innovation Solution
A method that evaluates driving style by calculating a scalar driving style descriptor based on normalized longitudinal and lateral accelerations, considering their rate of change and vehicle speed, and adjusts weighting factors according to steering wheel operations to accurately differentiate between driving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If steering angle sensor data is used to judge driving style, then the system can detect steering operations, but it cannot distinguish between high-speed cornering and parking maneuvers leading to judgment errors
Solution Approach 1:
The patent changes the parameter used for driving style judgment from steering angle to acceleration characteristics. By using acceleration data (both longitudinal and lateral) instead of steering angle, the system can accurately distinguish between different driving scenarios such as high-speed cornering and parking maneuvers, resolving the ambiguity in driving style judgment.
2Extent of automation
If a master controller automatically selects vehicle modes based on driving behavior, then mode switching is automated, but the system complexity increases
Solution Approach 1:
The patent makes the existing controller perform multiple functions: it not only controls vehicle subsystems but also evaluates driving style and automatically selects vehicle modes. By integrating these functions into a single controller, the system achieves automatic mode selection without significantly increasing overall system complexity.
3Ease of manufacture
If data is collected at constant rate, then data collection is simple, but trajectories driven at low speed produce more data and have higher weight in evaluation
Solution Approach 1:
The patent changes the data collection approach from constant rate to speed-proportional rate. By collecting acceleration data at a rate proportional to vehicle speed, the system ensures that each trajectory contributes equally to the driving style evaluation regardless of driving speed, improving the reliability of the evaluation.
Data Source
AI summary
A method is provided for controlling at least one active subsystem in a vehicle chassis. The method includes, but is not limited to the steps of evaluating a driver's driving style based on data (ax(K), ay(K)) representative of acceleration of the vehicle and setting an operating state of the subsystem according to the driving style.