DCT Centrifugal Compensation Timing for Noise and Shift Impact
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Solution Overview
Problem
Existing dual-clutch transmission (DCT) systems generate abnormal noise under certain working conditions due to the narrow operation coverage of centrifugal compensation control strategies, which are based solely on engine speed and clutch pressure, affecting customer experience and reducing transmission service life.
Innovation Solution
A method and system that collect vehicle working-condition signals, including accelerator pedal, ESP, and gear signals, and hydraulic module signals to determine vehicle condition status and clutch oil-filling status, allowing for precise centrifugal compensation control timing to reduce noise and improve shift smoothness without additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If centrifugal compensation control is performed based solely on engine speed and clutch pressure, then the control system remains simple, but the operation coverage is narrow and abnormal noise occurs under certain working conditions
Solution Approach 1:
The patent applies preliminary action by determining vehicle condition status (such as large-throttle starting state, parking state, gear-shifting state) and clutch oil-filling status (before or after oil-filled) before performing centrifugal compensation control. This allows the system to proactively adjust control timing based on predicted operating conditions rather than reacting to noise after it occurs, thereby expanding operation coverage while maintaining manageable complexity through structured status classification
Solution Approach 2:
The patent implements dynamics by making the centrifugal compensation control timing adaptive to different vehicle conditions. The control system dynamically adjusts the cut-in timing based on real-time vehicle condition status and clutch oil-filling status, transitioning from a static control approach to a dynamic one that responds to changing operating conditions, thus expanding adaptability without proportionally increasing complexity
2Object-affected harmful factors
If centrifugal compensation control is performed without considering clutch oil-filling status, then the control strategy is simple, but abnormal noise and gear impact occur during starting and shifting
Solution Approach 1:
The patent applies feedback by monitoring the clutch oil-filling status (determining whether the clutch is before or after oil-filled) and using this information to adjust the centrifugal compensation control timing. This feedback mechanism allows the system to detect clutch status changes and respond appropriately, reducing abnormal noise and gear impact by synchronizing control actions with the actual clutch filling state
Solution Approach 2:
The patent replaces direct mechanical noise reduction approaches with a control-based solution. Instead of modifying the mechanical clutch structure to eliminate noise, the system uses electronic control to adjust centrifugal compensation timing based on detected clutch status, substituting a mechanical problem with a control strategy that achieves noise reduction through precise timing control
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
Expands operation coverage of vehicle working conditions, reduces abnormal noise and gear impact during starting and shifting, prolongs transmission life, and simplifies maintenance with lower failure rates and costs, applicable to new and old models.
Implementation Method 1
the position signal of the piston moves from a bottom dead center position toward a top dead center position and the position signal of the hydraulic valve plate is a switched-on signal
Implementation Method 2
the possibility of achieving complete compensation of the centrifugal-force-dependent pressures in the working chambers through the provision of a compensating chamber
Data Source
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AI summary
A method of centrifugal compensation control for a transmission, which includes steps of: collecting a vehicle working-condition signal and determining a vehicle condition status according to the vehicle working-condition signal; collecting a hydraulic module signal and determining a clutch oil-filling status according to the hydraulic module signal, and performing a centrifugal compensation on the transmission according to the vehicle condition status and the clutch oil-filling status. Through a recognition of an accelerator pedal signal, an ESP signal, a vehicle speed signal, and a vehicle gear signal, as a condition for determining the vehicle condition status of a centrifugal compensation control strategy, and a recognition of position signals of a piston and a hydraulic valve plate of a hydraulic module, as a condition for determining a centrifugal compensation cut-in timing of the centrifugal compensation control strategy, an operation coverage of vehicle working conditions of the centrifugal compensation control strategy is improved, an abnormal noise of a DCT during starting or shifting is reduced, an impact of the gear during shifting is reduced, and a service life of the gear of the transmission is prolonged. An apparatus and a system of centrifugal compensation control for the transmission, a storage medium and a vehicle are also provided.