Adaptive Flow Valve Calibration for Precise Transmission Oil Filling
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Solution Overview
Problem
Existing flow control strategies for wet double-clutch transmissions are affected by hardware variations, leading to poor hydraulic oil filling, reduced applicability, shortened service life, and increased calibration difficulties due to fixed flow-current curves that fail to adapt to changing hardware conditions.
Innovation Solution
A flow valve control method that involves a teach-in process to record and correct median current values, adapting the flow-current curve based on deviation values to ensure precise control, using preset speeds and thresholds to determine flow passage and complete the teach-in process, thereby improving the flow valve's control precision and applicability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed flow-current curve is used for flow valve control, then the control system is simple and easy to implement, but the control precision deteriorates due to hardware variations and wear
Solution Approach 1:
The patent transforms the static fixed flow-current curve into a dynamic adaptive curve that automatically adjusts based on real-time feedback from position sensors and pressure sensors. The control system continuously updates the flow valve current commands according to actual shifting fork position and hydraulic pressure conditions, enabling the system to adapt to hardware variations and wear while maintaining precise flow control.
Solution Approach 2:
The patent implements a closed-loop feedback control mechanism where position sensors detect the shifting fork position and pressure sensors monitor hydraulic pressure. These feedback signals are used to dynamically adjust the flow valve current commands, creating a self-correcting system that compensates for hardware variations and maintains accurate flow control without requiring complex manual calibration.
2Ease of manufacture
If a fixed flow-current curve is used, then the system is easy to manufacture and calibrate, but the adaptability to hardware variations deteriorates
Solution Approach 1:
The patent enables the control system to perform self-calibration and self-adjustment through the feedback mechanism. The system automatically adapts to hardware variations by continuously monitoring actual position and pressure conditions, and dynamically adjusting flow valve commands without requiring external calibration equipment or manual intervention, thus maintaining ease of manufacture while achieving high adaptability.
Solution Approach 2:
The patent changes the control parameters from fixed current values based on a predetermined curve to dynamically adjustable current values that adapt to actual system conditions. The flow valve current commands are modified in real-time based on feedback from sensors, allowing the system to accommodate hardware variations in pipeline length, valve characteristics, and component wear without requiring physical recalibration.
3Reliability
If the flow valve control does not adapt to hardware variations, then the initial control performance is acceptable, but the service life is shortened due to degraded hydraulic response over time
Solution Approach 1:
The patent implements a proactive compensation mechanism that anticipates and counteracts the effects of hardware degradation before they significantly impact performance. The feedback control system continuously monitors for deviations caused by wear and pipeline changes, and adjusts flow valve commands in advance to maintain optimal hydraulic response, thereby extending the operational life of the gearbox while preserving reliable control performance.
Data Source
AI summary
A flow valve control method, apparatus, and storage medium are provided. The method comprises: conducting a median current value teach-in of a flow valve starting from an initial median current value of the flow valve; and correcting a flow-current curve of the flow valve based on a deviation value obtained by the teach-in. Each teach-in process comprises: controlling current output to a flow valve, so that the flow valve successively goes through: when there is a flow passing through, an output flow enables a shifting mechanism to return to position, and when there is a flow passing through again, an output flow again enables the shifting mechanism to return to position; recording a current value the twice when there is a flow passing through the flow valve as a maximum median current value; and acquiring a deviation value of the maximum median current value from the initial median current value.