Dynamic Engine Lash Torque Filtering via Speed Variation
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Solution Overview
Problem
Existing engine clearance detection methods in vehicles with petrol or diesel thermal powertrains are static and do not account for the dispersion of engine blocks and wear of the traction chain, leading to suboptimal driving pleasure, especially as engines age.
Innovation Solution
A method that dynamically detects engine play by varying engine speed or correction torque gradients to adapt torque control, eliminating the need for fixed thresholds and accounting for wear, involving detection of entry and exit times based on noise levels and torque gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed torque thresholds are used for engine clearance detection, then the control system is simple to implement, but the driving pleasure deteriorates as the engine ages due to wear and dispersion
Solution Approach 1:
The patent applies dynamics by transitioning from static fixed torque thresholds to dynamic adaptive thresholds. The system continuously adjusts the torque thresholds based on real-time detection of engine clearance passage events, allowing the control parameters to evolve with engine wear and maintain optimal performance throughout the vehicle's lifecycle.
Solution Approach 2:
The system implements self-service through automatic adaptation mechanisms. The control unit autonomously detects engine clearance passages and adjusts torque thresholds without requiring manual recalibration or external intervention, enabling the system to self-optimize as the engine ages and wear patterns develop.
2Loss of time
If static torque thresholds are used, then calibration time is reduced, but measurement precision deteriorates because dispersion and wear are not accounted for
Solution Approach 1:
The patent implements feedback by continuously monitoring engine operating parameters and using detected clearance passage events to adjust torque thresholds. This closed-loop approach ensures that the system maintains high measurement precision by adapting to actual engine conditions, eliminating the need for repeated manual calibration while preserving accuracy.
3Ease of operation
If fixed thresholds are applied, then the control system is easy to operate, but reliability deteriorates as the engine wears and thresholds become suboptimal
Solution Approach 1:
The system applies preliminary action by proactively detecting engine clearance passages and adjusting torque thresholds before performance degradation becomes noticeable. This anticipatory adjustment ensures that the control system maintains reliability and consistent driving pleasure throughout engine wear, without requiring complex user intervention or recalibration.
Data Source
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AI summary
The invention relates mainly to a method for filtering an engine reference torque when passing through engine lash involving the following steps: - determining (101) an engine reference torque, - detecting (102) a time (t1) of entering engine lash and a time (t2) of exiting engine lash defining a zone (Z) of passing through engine lash, - filtering (103) the engine reference torque (Ce) in the zone (Z) of passing through engine lash, and - if need be, applying (104) a corrective torque (Ccor) in phase opposition with a speed (Wm) of the combustion engine. According to the invention, the time (t1) of entering engine lash is detected from a variation in the speed (Wm) of the combustion engine or from a variation in the corrective torque (Ccor).