Vehicle Transmission Synchronization via Friction Elements
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Solution Overview
Problem
Automatic transmission devices with positive-locking shifting elements face challenges in achieving high shifting comfort and efficient operation within acceptable time frames, as they require additional synchronization measures that increase production costs and space requirements.
Innovation Solution
A method that involves raising the transmission capacity of friction-locking shifting elements to a slip-free state, allowing the positive-locking shifting element to be closed within a predefined differential speed range, without additional synchronization devices, by adjusting the drive torque and using existing frictional shifting elements to synchronize the positive-locking element, thus enabling smooth and cost-effective operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If additional constructive synchronization devices are added to enable positive-locking shifting elements to operate at higher differential speeds, then shifting time is reduced, but production costs and space requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-synchronizing the positive-locking shifting element using frictional shifting elements before the actual engagement. The control unit raises the transmission capacity of frictional shifting elements to create a slip-free operating state, which prepares the differential speed to be within the transferable range before the positive-locking element engages, thereby reducing shifting time without adding complex synchronization devices
Solution Approach 2:
The patent uses frictional shifting elements as intermediary components to synchronize the positive-locking shifting element. These frictional elements act as mediators that temporarily carry the torque and adjust the differential speed, enabling the positive-locking element to engage smoothly at higher speeds without requiring additional synchronization mechanisms
2Ease of operation
If additional constructive synchronization devices are added to enable positive-locking shifting elements to operate at higher differential speeds, then shifting comfort is improved, but production costs and space requirements increase
Solution Approach 1:
The control unit performs preliminary synchronization by raising the transmission capacity of frictional shifting elements to create a slip-free state before the positive-locking element engages. This preliminary action ensures that the differential speed is already within the acceptable range, guaranteeing smooth engagement and high shifting comfort without additional synchronization devices
Solution Approach 2:
Frictional shifting elements serve as intermediary components that mediate the synchronization process. They temporarily carry the torque and adjust the speed differential, allowing the positive-locking element to engage smoothly at higher differential speeds, thereby improving shifting comfort without increasing construction complexity
3Loss of energy
If positive-locking shifting elements are used to reduce drag losses, then operational efficiency is improved, but shifting time increases due to limited differential speed range
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the differential speed through frictional shifting elements before the positive-locking element engages. The control unit raises the transmission capacity of frictional elements to create a slip-free state, which prepares the speed differential to be within the transferable range, enabling the positive-locking element to engage quickly without the prolonged synchronization time that would otherwise be required
Solution Approach 2:
Frictional shifting elements act as intermediary components that temporarily carry the torque and adjust the differential speed. This intermediary action enables the positive-locking element to engage at higher differential speeds with reduced synchronization time, thereby reducing both drag losses during operation and shifting time during engagement
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 allows for high comfort and quick shifting operations without additional space or cost, avoiding unexpected jerks and reducing production expenses by utilizing existing components to synchronize the positive-locking shifting element, thus enhancing shifting efficiency and comfort.
Implementation Method 1
raising the transmission capacity of at least two friction-locking shifting elements, which are to be engaged to establish the power flow, to a level at which the shifting elements are in a slip-free operating state
Data Source
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AI summary
The invention relates to a method for operating a transmission device (10) of a vehicle drivetrain having a plurality of frictional switching elements (A, C to E) and at least one interlocked switching element (B) for implementing various ratios (1 to R). In the neutral operating mode of the transmission device (10), and when an operating mode distribution of the vehicle drivetrain is present for which the at least one interlocked switching element (B) is to be transitioned from an opened to a closed operating mode upon a request for producing the power flow in the transmission device (10), a differential speed in the region of the interlocked switching element (B) is determined by releasing the transmission capabilities of at least two frictional switching elements (A, C) that are to be closed for producing the power flow, wherein a drive torque of a drive machine (9) is adjusted to a level leading to the differential speed in the range of the interlocked switching element (B) within a predefined differential speed range, within which the interlocked switching element (B) at least approximately comprises a synchronous state and can be closed.