Multi-mode Transmission Control for Stuck-closed Clutch Faults
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Solution Overview
Problem
Powertrain systems with multiple torque-generative devices face challenges due to clutch faults, particularly stuck-open or stuck-closed states, which can lead to operational inefficiencies and instability, as existing control systems struggle to accurately account for all applied clutches and adapt to such faults.
Innovation Solution
A closed-loop control system is implemented in a multi-mode transmission that identifies and accounts for stuck-closed clutches, adjusting the control scheme to ensure proper operation by including the stuck-clutch as one of the applied clutches, thereby maintaining system stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clutch is detected to be stuck-closed, then the control system can maintain stability by accounting for the fault condition, but the transmission operation becomes constrained due to the fault
Solution Approach 1:
The control system dynamically adapts its operation based on the detected fault condition. When a stuck-closed clutch is identified, the system transitions from normal multi-state operation to a constrained operational mode that accounts for the permanent clutch application, allowing the transmission to maintain stability while operating within reduced capability parameters
Solution Approach 2:
The control system changes operational parameters by identifying and accounting for the stuck-closed clutch state. This involves detecting the fault condition, determining which clutch is stuck, and modifying the control strategy to operate as if that clutch is permanently applied, thereby maintaining system stability under fault conditions
2Reliability
If the control system monitors and detects clutch faults, then operational reliability improves, but the complexity of the control system increases
Solution Approach 1:
The control system implements feedback monitoring to detect clutch faults by comparing commanded clutch states with actual transmission behavior. This feedback mechanism allows the system to identify stuck-closed clutches and adapt its operation accordingly, improving reliability through continuous monitoring without requiring additional hardware sensors
Solution Approach 2:
The control system performs self-diagnosis by monitoring its own operational parameters and detecting inconsistencies that indicate clutch faults. The system uses its existing control architecture to identify fault conditions and automatically adapts its operation, eliminating the need for separate diagnostic hardware or complex external monitoring systems
Data Source
AI summary
A powertrain system includes a multi-mode transmission having a plurality of torque machines. A method for controlling the powertrain system includes identifying all presently applied clutches including commanded applied clutches and the stuck-closed clutch upon detecting one of the torque-transfer clutches is in a stuck-closed condition. A closed-loop control system is employed to control operation of the multi-mode transmission accounting for all the presently applied clutches.