Electrified Powertrain Torque Control for Obstacle and Traction Limits
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Solution Overview
Problem
Existing torque control strategies in electrified vehicles are overly sensitive and prone to false triggering during normal driving conditions, leading to unnecessary loss of propulsion and safety concerns, as they are primarily designed for worst-case scenarios.
Innovation Solution
A control strategy that dynamically adjusts torque limits based on real-time obstacle detection, road surface traction, and road curvature, using sensors to determine specific torque limits to prevent collisions, wheel slip, and vehicle stability, and incorporates a safety check module to ensure torque requests do not exceed safety tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If torque limits are reduced to prevent collisions with detected obstacles, then collision risk is reduced, but vehicle productivity and normal driving performance deteriorate
Solution Approach 1:
The system dynamically adjusts torque limits based on real-time obstacle detection and environmental conditions. When obstacles are detected at safe distances or conditions indicate low risk, the system maintains normal torque limits for optimal driving performance. When conditions warrant caution, torque limits are temporarily reduced only for the duration and scope of the hazard, allowing normal productivity to resume immediately when conditions return to normal
Solution Approach 2:
The patent applies partial action by reducing torque limits only when and where necessary based on sensor detection. Instead of continuously limiting torque, the system applies torque reduction selectively based on obstacle proximity and environmental conditions, maintaining full productivity during normal conditions while providing protective torque limitation only when hazards are detected
2Measurement precision
If multiple sensor inputs and torque modules are implemented to dynamically adjust torque limits, then control precision and safety are improved, but device complexity increases
Solution Approach 1:
The patent segments the torque control system into multiple independent modules, each responsible for a specific function: obstacle detection module, road surface detection module, curvature detection module, and torque calculation modules. This segmentation allows each component to be simpler and more specialized, making the overall complex system manageable through modular design where each segment handles a specific aspect of torque control
Solution Approach 2:
The controller serves multiple functions by integrating obstacle detection, road surface analysis, curvature detection, and torque limit calculation in a single control unit. This multi-functionality reduces the need for separate dedicated systems for each function, managing device complexity while maintaining comprehensive torque control precision through a unified control architecture
Data Source
AI summary
A method for controlling driveline torque on an electrified powertrain based on obstacle detection is provided. The electrified powertrain includes a first eMotor, a second eMotor and an internal combustion engine (ICE). An obstacle is detected proximate to the vehicle. A proximity signal is communicated to a first torque module that determines a first torque limit. A road surface is detected. A traction limit signal is communicated to a second torque module that determines a second torque limit. A road curvature is detected. A curvature signal is communicated to a third torque module that determines a third torque limit. A safety tolerance is determined based on the first, second and third torque limit. A first torque request is communicated to the ICE. A second torque request is communicated to the first eMotor. A third torque request is communicated to the second eMotor.