Steering System Single Control Loop Lane Keeping
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Solution Overview
Problem
Conventional lane keeping systems for vehicles are complex and require multiple control loops, which increases complexity, integration effort, and cost, while also being less effective with low-bandwidth sensor systems.
Innovation Solution
A vehicle steering system with an electric power steering system that employs a single control loop with lead-lag compensation, utilizing sensors and a driver input device to determine driver intent and vehicle position relative to lane markers, providing torque adjustments to assist the driver in maintaining lane position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple control loops are employed in conventional lane keeping systems, then the lane keeping function can be maintained, but the system complexity and integration effort increase
Solution Approach 1:
The patent combines multiple control loops (lane position control, lane curvature control, and heading angle control) into a single integrated control loop that processes lane position error, vehicle speed, and steering angle to generate steering torque commands. This merging reduces system complexity while maintaining the lane keeping function through unified control logic.
2Ease of operation
If multiple sensor systems and control loops are used to evaluate driver intent, then accurate lane keeping assistance can be provided, but the device complexity and cost increase
Solution Approach 1:
The patent makes the existing steering system components multi-functional by using the steering angle sensor and vehicle speed sensor for both traditional power steering assistance and lane keeping assistance. The controller evaluates driver intent by analyzing patterns in these existing sensor inputs rather than requiring separate dedicated sensors, thereby reducing device complexity while maintaining assistance accuracy.
3Power
If a camera system and multiple control loops are integrated, then lane keeping assist torque can be provided, but the manufacturing complexity and integration effort increase
Solution Approach 1:
The patent segments the lane keeping control into distinct functional modules: lane position error calculation from camera data, vehicle speed measurement, steering angle measurement, and steering torque command generation. This modular segmentation allows each component to be developed and tested independently, reducing manufacturing complexity and integration effort while maintaining the ability to provide lane keeping assist torque.
Data Source
AI summary
A system for steering a vehicle including: an actuator disposed in a vehicle to apply torque to a steerable wheel; a driver input device receptive to driver commands for directing the vehicle; and a sensor for determining an intent of a driver and generating a signal indicative thereof. The system also includes: a lane keeping system for detecting a location of the vehicle relative to a lane marker and generating a lane position signal indicative thereof; a controller in operable communication with the actuator, the driver input device, the first sensor, and the lane keeping system. The controller provides a command to the actuator responsive to the intent of the driver, the lane position, and a desired lane position. The controller executes a lane keeping algorithm consisting of a single control loop based on at least one of the lane position and the lane position deviation.