Vehicle Running Control with Cant-Corrected Curve Cancellation
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Solution Overview
Problem
Existing vehicle running control systems often cancel control unnecessarily when a vehicle is on a curve due to inaccurate estimation of lateral forces caused by road cant, leading to delayed determination of when to cancel control.
Innovation Solution
A running control device and method that calculates a corrected estimated lateral acceleration by subtracting the estimated cant lateral acceleration from the estimated lateral acceleration, and only cancels control when this value exceeds a determination reference value, ensuring accurate assessment of actual lateral forces acting on the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If actual lateral acceleration is used for determination, then accuracy is improved, but response delay occurs as future lateral force cannot be estimated
Solution Approach 1:
The patent performs preliminary calculation of corrected estimated lateral acceleration using lane curvature and vehicle speed before the vehicle actually experiences the lateral force. By estimating future lateral acceleration based on current lane geometry and subtracting estimated cant effects in advance, the system achieves both high accuracy and timely response for control cancellation determination.
Data Source
AI summary
A running control device for a vehicle comprising a lane information acquisition device and an electronic control unit that performs a running control in which a target steering angle for bringing a lateral position of the vehicle with respect to a lane to a target position is calculated and an automatic steering device is controlled so that a steering angle becomes the target steering angle, and is configured to calculate a lane curvature based on lane information, calculate an estimated lateral acceleration of the vehicle based on the lane curvature, obtain information about a lane cant in front of the vehicle, and calculate an estimated cant lateral acceleration based on the lane cant, and perform no running control when a magnitude of the estimated lateral acceleration of the vehicle which is corrected by subtracting the estimated cant lateral acceleration exceeds a determination reference value.