One-Way Clutch Control for Powertrain Lash Inhibition
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Solution Overview
Problem
Current powertrain systems with one-way clutches, such as mechanical diodes, face challenges in managing torque capacity and preventing back-torque due to directional asymmetry, where slip detection strategies are ineffective in the freewheeling direction, leading to potential clutch failures.
Innovation Solution
A method is implemented to control the engagement strategy of a one-way clutch device by modeling its capacity based on a loading step change profile and applying a continuous reactive load in the direction where it has capacity, inhibiting lash and preventing back-torque, while ignoring slippage in the freewheeling direction to avoid false failure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slip detection strategies are applied to one-way clutches, then clutch capacity can be monitored, but false failure detection occurs in the freewheeling direction
Solution Approach 1:
The patent applies asymmetry by implementing direction-specific monitoring logic that recognizes the one-way clutch's inherent directional capacity. The control module distinguishes between the capacity direction (where slip indicates potential failure) and the freewheeling direction (where slip is normal operation), preventing false failure detections while maintaining reliable capacity monitoring in the relevant direction.
2Stability of the object's composition
If continuous reactive load is applied to maintain engagement, then clutch lash is inhibited, but additional torque management complexity is introduced
Solution Approach 1:
The patent implements self-service by using the one-way clutch's own mechanical properties to maintain engagement stability. The continuous reactive load leverages the clutch's inherent capacity in the first direction to automatically inhibit lash and maintain engagement, reducing the need for complex external control mechanisms while achieving stable operation.
Data Source
AI summary
A powertrain system includes an internal combustion engine, at least one electric machine and an electro-mechanical transmission operative to transmit torque to a drive line. A method for controlling the powertrain system includes executing an engagement strategy of a one-way clutch device only having capacity in a first direction. The engagement strategy includes modeling a capacity of the one-way clutch device in accordance with a loading step change profile until a first capacity limit of the one-way clutch device is achieved. A continuous reactive load is applied to the one-way clutch device in the first direction to maintain engagement and inhibit lash of the one-way clutch device.