Transmission Control Unit Transportation Mode Shifting
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Solution Overview
Problem
Automatic transmissions in transportation mode are prone to clutch damage due to excessive shifting loads during loading and maneuvering of motor vehicles, as existing systems do not effectively prevent manual shifting operations that can overrev the engine.
Innovation Solution
An apparatus with an electronic transmission control unit and a transportation mode functional module that suppresses direct upshift or downshift operations in active transportation mode, allowing only automatic mode operation, with the weakest shift element always engaged in forward gears to prevent excessive loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual shifting operations are permitted in transportation mode, then operator control flexibility is improved, but clutch damage risk increases due to excessive shifting loads
Solution Approach 1:
The patent extracts the manual shifting function from the transportation mode by blocking the second selector device (manual shift buttons) when transportation mode is detected. This separation removes the harmful manual intervention capability while preserving automatic operation, directly resolving the contradiction between operator control flexibility and clutch durability.
Solution Approach 2:
The control unit preemptively blocks manual shifting operations before they can cause damage by detecting transportation mode conditions (such as vehicle on transporter, loading dock, or service station). This preliminary protective action prevents excessive shift loads from occurring in the first place, protecting clutches before damage can occur.
2Reliability
If automatic mode is enforced in transportation mode, then transmission reliability is improved, but operator intervention capability deteriorates
Solution Approach 1:
The system dynamically adjusts the availability of manual shifting based on detected operating conditions. When transportation mode is detected, manual shifting is blocked; when normal operating conditions are detected, manual shifting is restored. This dynamic adaptation resolves the contradiction by providing reliability when needed while preserving operator capability when appropriate.
Solution Approach 2:
The control unit changes the operational parameters of the selector devices based on transportation mode detection. The first selector device (automatic mode) remains fully functional, while the second selector device (manual mode) has its functionality parameter changed from enabled to blocked state, achieving transmission protection while maintaining adaptability through parameter adjustment.
3Reliability
If the weakest shift element is always engaged, then transmission reliability is improved, but shift element wear increases
Solution Approach 1:
By blocking manual shifting operations in transportation mode, the system prevents excessive and potentially damaging shift loads from being applied to the weakest shift element. This preliminary protective action reduces the frequency and intensity of wear-inducing operations, extending service life while maintaining transmission stability during critical transportation periods.
Data Source
AI summary
The apparatus suppresses manual shifting options in an electronically controlled automatic transmission with a manual mode in the active transportation mode of a motor vehicle by appropriate programming of an electronic transmission control unit. The transmission can be operated only in the automatic mode. Preferably, only the forward gears can be selected in this case, the weakest shift element, in particular the weakest brake or clutch in an automatic transmission, always being closed in the forward gears.