Forward Camera Failover Control for ADAS Reliability Loss
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Solution Overview
Problem
Advanced driver assistance systems (ADAS) face challenges in maintaining reliable actuation commands due to hardware or software failures, leading to potential loss of control over vehicle lateral and longitudinal movements, especially when sensors like front camera modules (FCM) or e-Horizon modules degrade or fail.
Innovation Solution
The system incorporates a front camera module (FCM) as a backup controller to generate actuation commands when the ADAS controller is unreliable, utilizing sensor data from multiple sources, including FCM, e-Horizon, radar, and LiDAR, to ensure continuous control of vehicle movements through lateral and longitudinal actuation, with a watchdog timer monitoring system to assess reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the ADAS controller is used to generate actuation commands, then the vehicle control system can provide advanced driving assistance functions, but the system reliability decreases when hardware or software failures occur
Solution Approach 1:
The patent implements a dual-controller architecture where the FCM controller and ADAS controller each handle specific control functions. The FCM controller manages basic lateral and longitudinal control, while the ADAS controller handles advanced driving assistance functions. This division allows the system to maintain reliable basic control through the simpler FCM controller while providing advanced automation through the ADAS controller, resolving the contradiction between automation extent and reliability.
Solution Approach 2:
The patent introduces a controller selection mechanism that acts as an intermediary between the FCM controller and ADAS controller. This selection logic monitors the operational status of both controllers and dynamically selects which controller generates actuation commands based on reliability assessments. When the ADAS controller fails, the selection mechanism switches to the FCM controller, maintaining system reliability while preserving ADAS functionality when available.
2Reliability
If the system switches between ADAS and FCM control based on reliability, then the system maintains vehicle stability during failures, but the control system complexity increases
Solution Approach 1:
The patent segments the control system into distinct functional modules: the FCM controller for basic control, the ADAS controller for advanced functions, and a controller selection mechanism for switching between them. This segmentation allows each component to be independently designed and tested, reducing overall system complexity while maintaining reliability through the segmented architecture that enables failover capabilities.
3Reliability
If multiple sensors (FCM, e-Horizon, radar, LiDAR) are used to ensure continuous control, then the system maintains comprehensive vehicle monitoring, but the system complexity and cost increase
Solution Approach 1:
The patent designs the FCM controller to serve multiple functions: it processes data from the front camera module, generates lateral control commands, generates longitudinal control commands, and acts as a backup controller when the ADAS controller fails. This multi-functionality reduces the need for separate dedicated components, maintaining comprehensive vehicle monitoring capability while reducing overall system complexity compared to having entirely separate systems for each function.
Data Source
AI summary
A driving assistance system includes a front camera module (FCM). The system, responsive to processing captured image data from the FCM, generates FCM control signals. The system includes a plurality of vehicle sensors capturing sensor data and an advanced driving-assistance system (ADAS) controller. The ADAS controller, responsive to processing the sensor data, generates ADAS control signals. The ADAS controller generates an ADAS status signal indicating a reliability of the generated ADAS control signals. With the ADAS status signal indicating the reliability of the generated ADAS control signals is at or above a threshold ADAS reliability level, the system controls the vehicle using the ADAS control signal and, responsive to determining that the ADAS status signal indicates that the reliability of the generated ADAS control signals is below the threshold, switches from controlling the vehicle based on the ADAS control signals to controlling the vehicle based on the FCM control signals.