Hybrid Engine Clutch Touch Point Learning Control
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Solution Overview
Problem
Conventional methods for learning the touch point of the engine clutch in hybrid electric vehicles, particularly those with dual clutch transmission, are less accurate and require improvement for stable power delivery and rapid torque response.
Innovation Solution
A method and apparatus for learning the touch point of a hybrid electric vehicle's engine clutch involve determining a learning condition, releasing the transmission clutch, controlling motor speed, increasing coupling pressure of the engine clutch, and comparing the change in motor torque to predetermined values to accurately learn the touch point, especially during electric vehicle mode operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods for learning the touch point of the engine clutch are used in dual clutch transmission vehicles, then the learning process can be performed, but the accuracy of the touch point learning is insufficient
Solution Approach 1:
The patent applies preliminary action by performing touch point learning during EV mode operation before actual clutch engagement is needed. The controller proactively learns the touch point characteristics when the vehicle is operating in electric vehicle mode, storing this information for future use during hybrid mode operation. This advance learning ensures accurate touch point data is available when needed for stable power delivery.
Solution Approach 2:
The patent implements feedback by continuously monitoring motor speed changes and torque variations during the learning process. The controller adjusts the clutch coupling pressure based on feedback from speed sensors and torque measurements, comparing actual values against predetermined thresholds to accurately identify the touch point. This closed-loop feedback mechanism ensures high learning accuracy.
2Speed
If the engine clutch coupling pressure is increased rapidly, then the torque response speed is improved, but the coupling impact increases
Solution Approach 1:
The patent applies dynamics by implementing a dynamic coupling pressure control strategy that adapts to real-time operating conditions. The controller adjusts the clutch coupling pressure incrementally based on motor speed changes and torque requirements, rather than applying fixed rapid pressure increases. This dynamic adjustment maintains rapid torque response while minimizing harmful coupling impacts.
Solution Approach 2:
The patent utilizes parameter changes by varying the clutch coupling pressure as a controllable parameter based on learned touch point characteristics. The controller modifies coupling pressure in controlled increments, comparing torque changes against predetermined values to achieve optimal balance between response speed and impact reduction. The learned touch point data enables precise parameter adjustment.
Data Source
AI summary
A method for learning a touch point of an engine clutch of a hybrid electric vehicle including a motor connected to a transmission and an engine selectively connected to the motor through the engine clutch includes determining whether a learning condition of the touch point of the engine clutch is satisfied, releasing a transmission clutch and controlling a motor speed when the learning condition is satisfied, increasing a coupling pressure of the engine clutch when a change amount of the motor speed is less than a first predetermined value, comparing a change amount of a motor torque according to the increased coupling pressure of the engine clutch with a second predetermined value, and learning the touch point of the engine clutch when the change amount of the motor torque is greater than or equal to the second predetermined value.