Automated Manual Transmission Sync Start Detection
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Solution Overview
Problem
Existing automated manual transmission systems face challenges in accurately determining the sync start point, leading to increased shifting time or shifting impact due to erroneous estimation, affecting response and shifting quality.
Innovation Solution
A method involving a series of steps to accurately determine the sync start in automated manual transmissions, including slip preparation, actuator operation, clutch speed determination, stop determination, and position determination, with optional braking and controlled actuator force application, to identify the precise point of synchronization initiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the sync start is estimated to be a point that is too close to the neutral position, then the shifting operation can be completed, but the shifting time increases and response degrades
Solution Approach 1:
The system uses feedback from clutch speed sensors and actuator position sensors to continuously monitor the shifting process. By measuring the actual clutch speed change and actuator position in real-time, the system can accurately determine the sync start point based on observed physical changes rather than pre-set estimates, thereby reducing shifting time without sacrificing accuracy.
Solution Approach 2:
The patent replaces mechanical estimation methods with sensor-based detection systems. Using clutch speed sensors and actuator position sensors, the system electronically detects the sync start point through measured physical parameters (clutch speed change, actuator position) rather than relying on mechanical position estimation, achieving both speed and accuracy.
2Speed
If the sync start is estimated to be a point that is too far from the neutral position, then the response can be improved, but a shifting impact occurs
Solution Approach 1:
The system continuously monitors clutch speed and actuator position during the shifting operation. By using feedback from these sensors, the system can precisely identify the actual sync start point based on measured physical changes, enabling the actuator to stop at the correct position without causing impact, while still achieving rapid response through optimized control.
Solution Approach 2:
The patent replaces mechanical position estimation with electronic sensor-based detection. By using clutch speed sensors and actuator position sensors to electronically detect the sync start point through physical parameter changes, the system achieves both fast response and impact-free operation through precise electronic control.
3Productivity
If the sleeve is moved rapidly before sync start, then shifting response is improved, but shifting quality deteriorates if sync start is misidentified
Solution Approach 1:
The system uses real-time feedback from clutch speed sensors and actuator position sensors to monitor the shifting process. This feedback mechanism allows the system to maintain rapid sleeve movement while accurately identifying the sync start point through observed physical changes, ensuring both high productivity and reliable shifting quality.
Solution Approach 2:
The patent replaces mechanical position estimation with electronic sensor-based detection systems. By using clutch speed and actuator position sensors to electronically detect the sync start point, the system enables rapid sleeve movement with high confidence in accuracy, achieving both fast response and high reliability.
Data Source
AI summary
A method of searching for a sync start in an automated manual transmission, may include a slip preparing step of operating, in a parked position, a sleeve and a clutch restrained so as not to rotate into a slip state, an actuator operating step of moving the sleeve toward a clutch gear from a neutral position, a clutch speed determination step of determining whether or not a speed of rotation of the clutch has decreased by the actuator operating step, a stop determination step of determining whether or not a movement of the sleeve that was driven by the actuator operating step has stopped, and a first position determination step of determining a point where the clutch speed determination step determines that the speed of the rotation of the clutch has decreased and the stop determination step determines that the movement of the sleeve has stopped as the sync start.