Dynamic Rate Limiting for Vehicle Lane Deviation Prevention
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Solution Overview
Problem
Existing lane deviation prevention systems in vehicles often cause discomfort to drivers by abruptly increasing the speed of the steering wheel during initial lane deviation prevention, especially at low speeds or small yaw angles, due to a single, large rate limit value setting for all scenarios.
Innovation Solution
A lane deviation prevention control device that calculates a dynamic rate limit value based on the vehicle's deviation state, including a rate limit value calculator that adjusts the rate limit value in accordance with the deviation lateral speed, allowing for a more gradual change in target steering torque to prevent lane deviation without sudden movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single, large rate limit value is used for all scenarios, then lane deviation prevention can be effective, but driver discomfort increases due to abrupt steering wheel speed changes
Solution Approach 1:
The patent applies dynamics by making the rate limit value adjustable rather than fixed. The rate limit value calculation unit dynamically adjusts the rate limit value based on vehicle speed and yaw angle, allowing the system to adapt to different driving conditions. This resolves the contradiction by enabling effective lane deviation prevention when needed while maintaining driver comfort in normal conditions.
Solution Approach 2:
The patent changes the parameter of rate limit value based on vehicle operating conditions. By calculating different rate limit values according to vehicle speed and yaw angle, the system optimizes the balance between prevention effectiveness and driver comfort for each specific scenario.
2Ease of operation
If the rate limit value is reduced to improve driver comfort, then steering torque changes more gradually, but lane deviation prevention effectiveness decreases
Solution Approach 1:
The system dynamically adjusts the rate limit value based on real-time vehicle conditions. When lane deviation risk is high (large yaw angle or low speed), a larger rate limit value is applied to ensure effective prevention. When risk is low, a smaller rate limit value maintains driver comfort. This dynamic adjustment resolves the contradiction between comfort and effectiveness.
Solution Approach 2:
The patent changes the rate limit value parameter according to vehicle speed and yaw angle conditions, enabling the system to optimize the balance between driver comfort and lane deviation prevention effectiveness for each specific operating scenario.
3Speed
If target steering torque changes rapidly to correct lane deviation, then response time is reduced, but driver discomfort increases due to sudden movements
Solution Approach 1:
The patent applies dynamics by making the rate of steering torque change adaptive rather than fixed. The rate limit value calculation unit dynamically determines appropriate rate limits based on vehicle speed and yaw angle, allowing rapid response when necessary while limiting abrupt changes that cause discomfort during normal operation.
Solution Approach 2:
The system changes the rate limit parameter based on vehicle operating conditions, enabling optimized balance between response speed and driver comfort for different scenarios such as high-speed vs. low-speed conditions and small vs. large yaw angles.
Data Source
AI summary
A lane deviation prevention control device for a vehicle includes a target steering torque calculator, a rate limit processor, and a rate limit value calculator. The target steering torque calculator calculates target steering torque to be applied to a steering system of an own vehicle in a lane deviation prevention control. The lane deviation prevention control includes preventing the own vehicle from deviating from a lane on which the own vehicle is traveling. The rate limit processor performs rate limit processing. The rate limit processing includes limiting a speed of change in the target steering torque to a rate limit value. The rate limit value calculator calculates the rate limit value in accordance with a deviation state of the own vehicle from the lane.