Power Transmission Fatigue Estimation Under Bidirectional Torque
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Solution Overview
Problem
Existing methods fail to accurately estimate the fatigue degree of power transmission components in vehicles, particularly in electric vehicles and hybrid electric vehicles, which experience varying loads due to electric power regeneration, necessitating a more precise assessment.
Innovation Solution
A fatigue degree estimation device and method that calculates the fatigue degree of power transmission components based on the magnitude and direction of torque acting on them, outputting a signal when the fatigue exceeds a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the fatigue degree estimation considers electric power regeneration loads, then the measurement precision of fatigue degree is improved, but the device complexity increases
Solution Approach 1:
The torque sensor and estimation section are designed to handle multiple functions: measuring torque during normal vehicle operation and detecting reversed torque during electric power regeneration. The system universally processes both driving and regenerative modes through the same hardware components, eliminating the need for separate sensors or systems for each mode.
Solution Approach 2:
The estimation section continuously monitors torque magnitude and direction, comparing detected values against threshold criteria to determine fatigue accumulation. This feedback mechanism allows the system to adaptively estimate fatigue degree based on real-time operating conditions, including regenerative braking events, thereby improving measurement precision without requiring complex manual intervention.
2Measurement precision
If the fatigue degree is estimated for each component separately, then the measurement precision is improved, but the loss of time in data processing increases
Solution Approach 1:
The power transmission system is segmented into distinct components (transmission, differential, drive shafts), and the estimation section calculates fatigue degree independently for each segment. This segmentation allows precise component-specific fatigue estimation while maintaining computational efficiency by processing each component's data separately rather than analyzing the entire system as a whole.
Data Source
AI summary
This device for estimating a degree of fatigue of a motive force transmitting component is a device for estimating the degree of fatigue of a motive force transmitting component in a motive force transmitting system from a motor/generator (drive source) to a driving wheel (wheel), and is provided with an estimation unit which estimates the degree of fatigue of the motive force transmitting component on the basis of the magnitude and direction of torque acting on the motive force transmitting component, and an output unit which outputs a signal indicating that the degree of fatigue has exceeded a threshold if the degree of fatigue exceeds a prescribed threshold that is set in advance, wherein the degree of fatigue is estimated by the different methods when the motive force transmitting component is a gear or a shaft.