EPS Mode Transition Handling Inertial Effects
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Solution Overview
Problem
Electric Power Steering (EPS) systems face challenges in adapting to advanced driver assist systems (ADAS) standards, particularly in determining and transitioning between different levels of autonomous driving modes, handling inertial effects of the steering wheel, and monitoring diagnostics such as torque sensor faults, which are unique to each mode of operation.
Innovation Solution
The implementation of an advanced driver assist module within the EPS system that determines the current and requested operating mode, transitions performance accordingly, and manages diagnostics, using sensors and control modules to adjust assist torque and calibration values, ensuring smooth transitions and appropriate feedback to the driver or system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the EPS system is designed to support multiple levels of autonomous driving modes, then the adaptability of the system is improved, but the device complexity increases due to the need for mode determination and transition mechanisms
Solution Approach 1:
The EPS system is designed with multi-functionality to support multiple levels of autonomous driving modes (Levels 0-5). The control module can operate in different modes including driver-fallback mode and highly autonomous mode, allowing a single system to perform multiple functions across different automation levels without requiring separate dedicated systems for each mode
2Extent of automation
If the EPS system implements mode determination and transition capabilities, then the extent of automation is improved, but the ease of operation deteriorates due to the need for managing inertial effects and diagnostics
Solution Approach 1:
The EPS control module automatically determines the current operating mode and executes mode transitions without requiring manual intervention from the driver or operator. The system self-manages the transition process, including handling inertial effects of the steering wheel and adjusting diagnostic monitoring, thereby maintaining ease of operation while achieving high levels of automation
3Reliability
If the EPS system monitors and records diagnostics for each mode of operation, then the reliability is improved, but the loss of information increases due to the need to track mode-specific diagnostic data
Solution Approach 1:
The diagnostic monitoring system is configured to apply different monitoring and recording strategies specific to each operating mode. In driver-fallback mode, the system monitors torque sensor faults with specific thresholds, while in highly autonomous mode, different diagnostic parameters are monitored. This localized quality approach ensures reliable diagnostics for each mode without overwhelming the system with unnecessary information from other modes
Data Source
AI summary
Technical solutions are described for facilitating an electric power steering (EPS) system to determine an operating mode of a vehicle that is equipped with the EPS, where the operating mode is indicative of a level of autonomous driving being used by the vehicle. The technical solutions further facilitate detecting a change in the operating mode of the vehicle, and facilitating a transition in computing an assist signal for the EPS system during the transition between the operating modes.