Automated Manual Transmission Starting Gear Adaptation
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Solution Overview
Problem
Existing methods for adapting the starting gear of heavy vehicles with automated manual transmissions do not effectively account for the movement behavior of the vehicle in front, leading to unnecessary gear shifts and clutch slippage in queue or heavy traffic conditions.
Innovation Solution
A method and arrangement that adjust the starting gear of an automated manual transmission based on the movement behavior of the vehicle in front, using a control unit that interacts with adaptive cruise control systems and sensors like radar to determine the appropriate gear selection, thereby ensuring the vehicle reaches the speed of the vehicle in front with full clutch engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the starting gear is selected as high as possible based on vehicle parameters, then driver comfort is improved and the number of gear changes is reduced, but unnecessary gear shifts and clutch slippage occur in queue or heavy traffic conditions
Solution Approach 1:
The control unit performs preliminary detection of the moving behavior of the vehicle in front before selecting the starting gear. By anticipating whether the vehicle ahead is stationary or moving, the system pre-adjusts the starting gear selection to avoid unnecessary clutch slippage and gear shifts, thereby resolving the contradiction between comfort and energy loss.
Solution Approach 2:
The starting gear selection is made dynamic by continuously monitoring the moving behavior of the vehicle in front. Instead of using a fixed high gear selection based solely on vehicle parameters, the system adapts the gear choice in real-time according to traffic conditions, eliminating unnecessary clutch slippage while maintaining driver comfort.
2Device complexity
If the starting gear is selected as high as possible based on vehicle parameters, then the number of gear changes is reduced, but unnecessary gear shifts occur when the vehicle speed does not match the selected gear
Solution Approach 1:
The control unit detects the moving behavior of the vehicle in front before the heavy vehicle starts moving. This preliminary detection allows the system to pre-select an appropriate starting gear that matches the expected speed conditions, preventing unnecessary gear shifts and improving gear shift efficiency while maintaining low device complexity.
Solution Approach 2:
The system uses feedback from the detection of the vehicle in front's behavior to adjust the starting gear selection. By continuously monitoring whether the vehicle ahead is moving or stationary and feeding this information back to the control unit, the system optimizes gear selection to reduce unnecessary gear changes while improving overall gear shift efficiency.
3Reliability
If the starting gear is not adapted to the movement behavior of the vehicle in front, then the transmission system operates with fixed parameters, but the vehicle cannot reach the speed of the vehicle in front with full clutch engagement
Solution Approach 1:
The control unit performs preliminary detection of the vehicle in front's moving behavior before clutch engagement. By knowing in advance whether the vehicle ahead is stationary or moving, the system can pre-select the appropriate starting gear to ensure full clutch engagement is achieved, thereby improving both clutch engagement reliability and starting gear adaptability.
Solution Approach 2:
The transmission control system serves itself by automatically detecting traffic conditions and adjusting the starting gear selection without driver intervention. This self-adjusting capability ensures that the clutch engagement reliability is maintained while the system adapts to different traffic scenarios, improving both reliability and adaptability simultaneously.
Data Source
AI summary
A method is provided for adapting the starting gear of an automated manual transmission in a heavy vehicle, where a pre-selected starting gear is selected by a transmission control unit depending on vehicle parameters of the heavy vehicle, where the starting gear is lowered from the pre-selected starting gear depending on a movement behavior of a vehicle in front of the heavy vehicle. The pre-selected starting gear can be adapted to the traffic in front of the vehicle, which makes it possible to avoid unnecessary gear changes and which allows for a smooth starting cycle of the vehicle.