Driveline Disconnect Clutch Adaptation via Torque Feedback
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Solution Overview
Problem
It is challenging to adjust the operation of a driveline disconnect clutch in vehicles to compensate for clutch degradation without notifying vehicle occupants, as existing methods are difficult to implement discreetly.
Innovation Solution
The method involves adjusting the application force of the driveline disconnect clutch based on torque sensor readings when the engine is not combusting air and fuel, allowing for the adaptation of the clutch's transfer function without noticeable changes to vehicle occupants, by partially closing the clutch and using the driveline integrated starter/generator to determine the torque transfer points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driveline disconnect clutch operation is adjusted to compensate for clutch degradation, then the clutch reliability is improved, but vehicle occupants may notice the clutch actuation which degrades drivability
Solution Approach 1:
The system performs clutch adaptation during predetermined adaptation conditions (engine not combusting, specific operating states) before degradation significantly impacts performance. By proactively adjusting the transfer function during appropriate windows, the system maintains reliability without requiring reactive corrections that would be noticeable to occupants.
Solution Approach 2:
The driveline disconnect clutch system automatically monitors its own degradation through torque sensor feedback and self-adjusts its transfer function without external intervention. The control module continuously learns and adapts the clutch characteristics, enabling the system to maintain optimal performance autonomously while avoiding noticeable disruptions to vehicle operation.
2Reliability
If the driveline disconnect clutch transfer function is adapted in real-time, then the clutch performance is maintained, but the complexity of the control system increases
Solution Approach 1:
The system employs a feedback mechanism where the control module continuously monitors torque sensor readings and compares actual clutch behavior against the stored transfer function. Based on this feedback, the system automatically adjusts the transfer function parameters to compensate for degradation, maintaining performance without requiring complex external calibration equipment or manual intervention.
Solution Approach 2:
The adaptation process involves adjusting specific parameters within the clutch transfer function (torque vs. displacement relationships) rather than redesigning the entire control system. By modifying these key parameters based on observed degradation patterns, the system maintains performance while keeping the control architecture relatively simple and manageable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the operation of the driveline disconnect clutch, ensuring seamless adaptation without disturbing vehicle occupants, thus enhancing drivability and fuel efficiency.
Implementation Method 1
adjusting application force of a driveline disconnect clutch in a vehicle driveline in response to a torque sensor while an engine in the vehicle driveline is not combusting air and fuel
Data Source
AI summary
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, a transfer function of a driveline disconnect clutch is adapted.