Braking System Lane-Keeping Support Steering Failure
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Solution Overview
Problem
Fully automatic driver assistance systems for driver-independent vehicle guidance face challenges in maintaining lane-keeping safety when the steering actuatorics fail, as existing solutions are costly and weight-additive, and require complex torque vectoring systems.
Innovation Solution
The method employs targeted wheel-selective braking interventions by the vehicle's braking system to maintain lateral guidance and ensure the vehicle stays within the lane, even if the steering system fails, by using the braking system to indirectly steer the vehicle and manage both lateral and longitudinal guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a second servo drive is added as an emergency system for steering, then the reliability of lane-keeping is improved, but the cost and weight of the vehicle increase significantly
Solution Approach 1:
The braking system, originally designed only for longitudinal control, is made multi-functional by enabling it to perform lateral guidance functions. The same braking actuators that control deceleration are now also used to generate asymmetric braking forces for steering correction, eliminating the need for a dedicated emergency steering system
Solution Approach 2:
The braking system serves itself by taking over multiple functions. Instead of requiring separate systems for steering and braking, the braking system expands its capabilities to include both longitudinal deceleration and lateral steering correction, making the vehicle self-sufficient in emergency situations
2Ease of operation
If a torque vectoring system is used for lane-keeping support, then the ease of operation is improved, but the device complexity and cost increase
Solution Approach 1:
The braking system is transformed from a single-function component to a multi-functional system that can perform both longitudinal deceleration and lateral steering correction. This eliminates the need for specialized torque vectoring hardware while maintaining the ability to provide active lane-keeping support
3Reliability
If fault detection is performed continuously, then the reliability is improved, but the response time is delayed until a critical state is reached
Solution Approach 1:
The system continuously monitors the operational status of the steering actuator in advance and detects potential failures before they lead to critical situations. By performing preliminary detection and switching to the braking system proactively, the system avoids delayed response that would occur only after a fault manifests
Solution Approach 2:
The control device continuously receives feedback signals from the steering actuator and processing device to monitor system health. This real-time feedback enables early detection of steering failures and triggers automatic switching to the braking system before the situation becomes critical
Data Source
AI summary
The invention relates to a method for providing lane-keeping support in automobiles during the operation of a fully automatic driver assistance system designed for driver-independent vehicle guidance by means of a control unit which controls the actuatorics of a steering system during operation of this driver assistance system such that the vehicle is maintained within the driving lane, characterized in that, in the event of failure of the steering system, targeted braking interventions are performed in order to maintain the lateral guidance for the lane-keeping support of the vehicle by means of a braking system of the vehicle.