Dual-Clutch Gear Shift Torque Management
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Solution Overview
Problem
Current gear shifting methods in automatic manual transmissions with dual-clutch gearboxes do not maximize acceleration performance while maintaining driving comfort, often requiring additional components and increased processing power.
Innovation Solution
A control method that adjusts torque transfer between clutches to maintain constant engine torque during gear shifts, allowing for increased clutch pressure to enhance acceleration, while also reducing discomfort by smoothing longitudinal acceleration changes through controlled clutch overlengthening and torque reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional gear shifting methods are used in dual-clutch transmissions, then the transmission can change gears, but acceleration performance is not maximized and driving comfort is compromised
Solution Approach 1:
The control method performs preliminary actions by pre-engaging the next gear on the second primary shaft before disengaging the current gear. The system monitors engine torque, clutch pressure, and gear position to prepare the successive gear in advance, ensuring seamless torque transfer and eliminating acceleration interruptions that would cause discomfort.
Solution Approach 2:
The system dynamically changes parameters including clutch pressure, engine torque output, and gear engagement timing. By adjusting clutch pressure profiles and coordinating torque reduction with the engine control unit, the system optimizes acceleration performance while smoothing transitions to maintain driving comfort.
2Speed
If additional components are added to maximize acceleration performance, then acceleration improves, but device complexity and cost increase
Solution Approach 1:
The control method makes the existing dual-clutch system multi-functional by enabling it to perform both gear engagement and acceleration optimization without additional components. The control unit coordinates both clutches to serve dual purposes: gear shifting and torque management for acceleration, eliminating the need for separate acceleration-assist mechanisms.
Solution Approach 2:
The system uses its own existing components (dual clutches, control unit, engine torque management) to achieve acceleration optimization. The control unit leverages the inherent capabilities of the dual-clutch architecture to self-optimize acceleration performance without requiring external assistance systems or additional hardware.
3Speed
If processing power is increased to optimize gear shifting control, then acceleration performance improves, but system complexity and cost increase
Solution Approach 1:
The control method applies partial action by selectively optimizing only the critical parameters needed for acceleration (clutch pressure profiles, torque transfer timing, gear engagement sequence) rather than processing all possible transmission parameters. This targeted approach achieves acceleration improvement without requiring excessive processing power.
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 method maximizes acceleration performance during driving without significantly impacting comfort, achieving this without additional hardware or complex processing, by optimizing clutch engagement and engine torque management.
Implementation Method 1
two coaxial clutches, each of which is adapted to connect a respective primary shaft to a drive shaft of an thermal internal combustion engine
Data Source
AI summary
An embodiment of a control method for carrying out a gear shifting in an automatic manual transmission having a dual-clutch gearbox to pass from a current shorter gear to a successive longer gear; the embodiment includes the steps of: receiving a gear shifting command; opening a first clutch associated to the current gear; closing a second clutch associated to the successive gear in a same first moment; finishing the opening of the first clutch associated to the current gear and finishing the closure of the second clutch associated to the successive gear in a same closing moment; keeping the rotation speed of the drive shaft of the engine constant and equal to an initial value imposed by the gear ratio of the current gear until the closing moment in which the opening of the first clutch is completed; after the closing moment, progressively decreasing the rotation speed of the drive shaft of the engine from the initial value imposed by the gear ratio of the current gear to a final value imposed by the gear ratio of the successive gear; and temporarily overlengthening the second clutch after the closing moment so that the second clutch temporarily transmits an additional torque which determines a progressive reduction of the rotation speed of the drive shaft from the initial value to the final value.