Automated Driving Speed Control for Driver Awareness and Thermal Limits
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Solution Overview
Problem
Automated Driving Systems (ADS) face challenges in ensuring driver awareness and processor cooling, leading to potential safety issues and high costs due to increased processing demands during complex driving situations, where conventional warning systems are insufficient and cooling systems are complex and costly.
Innovation Solution
The ADS automatically adjusts vehicle speed based on driver awareness and processor temperature, switching to higher automation levels and reducing speed to maintain safety and prevent overheating, using modules to determine awareness and temperature thresholds, thereby ensuring safe driving performance while reducing processing load and cooling system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driver is alerted when awareness is lost, then the driver is warned to regain awareness, but the driver may not respond rapidly enough and may take erratic actions
Solution Approach 1:
The system performs preliminary actions by gradually reducing automation functions and issuing progressive warnings before completely disengaging the driver. The system reduces automation level step-by-step and provides multiple warning signals (visual, auditory, haptic) in sequence, allowing the driver time to respond without being suddenly startled, thus preventing erratic reactions while ensuring timely awareness restoration.
2Reliability
If the processing load is increased to handle complex driving situations, then the ADS can maintain safety, but the processor temperature increases leading to overheating
Solution Approach 1:
The system dynamically adjusts processing load based on real-time thermal conditions. When processor temperature exceeds thresholds, the system dynamically reduces processing demands by lowering automation level, reducing sensor sampling rates, simplifying environmental models, and prioritizing critical safety functions. This dynamic adaptation allows the system to maintain safety within thermal constraints without requiring oversized cooling systems.
3Reliability
If the cooling system is designed to handle extreme processing loads, then the processor can operate safely during complex situations, but the cost and complexity of the cooling system increases
Solution Approach 1:
The system applies partial action by providing just enough processing power to handle the current driving situation's safety requirements, rather than maintaining maximum processing capacity continuously. During normal conditions, the system operates at reduced processing levels, and only escalates to full processing power when absolutely necessary for safety, thereby reducing thermal output and cooling system requirements without compromising safety.
4Reliability
If the automation level is increased to handle driver unresponsiveness, then the system can maintain control, but the driver's ability to retake control is limited
Solution Approach 1:
The system dynamically adjusts automation level based on driver responsiveness. When the driver fails to respond to warnings, the system automatically reduces automation level and restricts control functions to maintain safety. However, the system continuously monitors for driver recovery and automatically restores higher automation levels and full control functions when the driver regains awareness, creating a dynamic balance between safety and driver operability.
Data Source
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AI summary
An automated driving system, ADS (1). The ADS (1) includes an automation control module (109) for controlling one or more driving functions of a vehicle, and a safety control module (101-105) for determining one or more operating conditions relevant to the safety performance of the vehicle, such as driver awareness and processor temperature. The automation control module (109) is configured to automatically adjust the speed of the vehicle based on the one or more operating conditions determined by the safety control module (101-105).