Hybrid Engine Clutch Touch Point Learning via Torque Feedback
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Solution Overview
Problem
Conventional methods for learning the touch point of the engine clutch in hybrid electric vehicles, especially those with dual clutch transmissions, are less accurate and require frequent updates, leading to inefficiencies in power delivery and drivability.
Innovation Solution
A method and apparatus that determine the touch point of the engine clutch based on changes in engine torque during vehicle operation, involving a controller that detects the running state, increases clutch coupling pressure when specific conditions are met, and synchronizes engine and motor speeds to learn the touch point, thereby improving accuracy and reducing coupling impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional learning method for wet engine clutch is applied to dry engine clutch, then the learning process can be simplified, but the learning accuracy deteriorates and frequent learning is required
Solution Approach 1:
The patent changes the learning method by monitoring engine torque parameters during vehicle operation instead of using traditional methods designed for wet clutches. The controller detects touch point by measuring engine torque changes when the clutch transitions from disengaged to engaged state, adapting the learning process to dry clutch characteristics while maintaining accuracy.
Solution Approach 2:
The system performs self-learning of the touch point automatically during normal vehicle operation without requiring separate learning procedures. The controller continuously monitors engine torque and automatically identifies the touch point when specific conditions are met, eliminating the need for manual intervention or specialized learning modes.
2Measurement precision
If engine clutch coupling pressure is increased to learn touch point, then learning accuracy is improved, but coupling impact increases
Solution Approach 1:
The controller uses feedback from engine torque monitoring to detect the touch point. When the clutch pressure increases and the clutch begins to engage, the engine torque changes in a detectable manner. The controller monitors this torque feedback and identifies the touch point based on the torque change pattern, allowing accurate detection without excessive pressure application.
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 enhances the accuracy of learning the engine clutch touch point while the vehicle is running, improving drivability by reducing coupling impact and ensuring stable power delivery.
Implementation Method 1
a wet engine clutch and learns the touch point of the engine clutch
Data Source
AI summary
An apparatus and a method are provided for learning a touch point of an engine clutch of a hybrid electric vehicle that learns the touch point of the engine clutch based on a change of an engine torque while the hybrid electric vehicle is running. The method includes determining whether an engine clutch coupling after shifting is required and whether a learning condition based on a running state of the hybrid electric vehicle is satisfied when the engine clutch coupling after shifting is required. A coupling pressure of the engine clutch is increased when the learning condition is satisfied and a changing amount of an engine torque based on the increased coupling pressure of the engine clutch is compared with a predetermined value. The touch point of the engine clutch is learned when the changing amount of the engine torque is greater than or equal to the predetermined value.