Vehicle Travel Control Reducing Route Deviation
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Solution Overview
Problem
Existing lane keep control apparatuses are unreliable and lack precision when lane division lines cannot be recognized by cameras, such as in snowy conditions, as they rely solely on map information and vehicle position data for control inputs, leading to insufficient control accuracy.
Innovation Solution
A travel control apparatus that includes a map information storage unit, vehicle position information obtaining unit, traveling road information obtaining unit, target traveling route setting unit, and a controller to estimate and adjust the vehicle's route based on motion information, allowing for precise lane keep control even without recognized lane division lines, using a steering controller with integrated navigation system, vehicle speed, yaw rate, and steering torque sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lane keep control is executed solely on the basis of map information and vehicle position information when lane division lines cannot be recognized, then the control can be maintained, but the precision and reliability of the control deteriorates
Solution Approach 1:
The patent combines multiple information sources (map information, vehicle position information, and vehicle motion information) to achieve reliable and precise lane keep control. The controller integrates data from the map information storage unit, vehicle position information obtaining unit, and vehicle traveling route estimating unit to determine accurate lane positions even when lane division lines are not visible.
Solution Approach 2:
The patent introduces vehicle motion information as an intermediary element to bridge the gap between map information and actual vehicle position. By estimating the vehicle's traveling route based on motion information from sensors (accelerometer, gyro sensor, steering angle sensor), the system can accurately determine lane position without relying on visible lane division lines.
2Measurement precision
If lane division lines are used for lane keep control, then the precision of control is improved, but the system becomes unable to operate when lane division lines are not visible due to snow or other conditions
Solution Approach 1:
The patent creates a universal lane keep control system that can operate under multiple conditions - both when lane division lines are visible and when they are not. The controller automatically switches between using lane division line recognition and using map information combined with vehicle motion information, making the system adaptable to various environmental conditions including snow, darkness, and curved roads.
Solution Approach 2:
The patent implements dynamic adaptation by continuously monitoring the availability and reliability of lane division line recognition. When lane lines are not visible or the recognition reliability is low, the system dynamically transitions to using map information and vehicle motion information, ensuring continuous and accurate lane keep control regardless of environmental conditions.
3Device complexity
If control amounts are set simply on the basis of map information, then the device complexity is reduced, but the precision of lane keep control deteriorates
Solution Approach 1:
The patent segments the lane keep control function into multiple independent units: map information storage unit, vehicle position information obtaining unit, vehicle traveling route estimating unit, and controller. Each unit processes specific types of information independently, and the controller integrates these segmented information sources to achieve high-precision control without excessive overall system complexity.
Data Source
AI summary
A travel control apparatus for a vehicle includes: a map information storage unit that stores map information; a vehicle position information obtaining unit that obtains position information indicating a position of the vehicle; a traveling road information obtaining unit that obtains traveling road information relating to a traveling road of the vehicle on the basis of the map information and the position information of the vehicle; a target traveling route setting unit that sets a target traveling route of the vehicle on the basis of the traveling road information of the vehicle; a vehicle traveling route estimating unit that estimates an traveling route of the vehicle on the basis of motion information relating to the vehicle; and a controller that performs control so as to reduce a deviation between the target traveling route of the vehicle and the estimated traveling route of the vehicle on the basis of the deviation.