Automatic Transmission Synchromesh Pre-Actuation for Fast Shifting
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Solution Overview
Problem
Automatic transmissions struggle to respond quickly to driver inputs, leading to discomfort during rapid shift operations.
Innovation Solution
Incorporating a control section that actuates specific synchromesh mechanisms between rotary shafts and gears when the neutral or parking position is detected, ensuring timely engagement and disengagement to facilitate smooth power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the automatic transmission uses conventional synchromesh mechanism actuation, then the structure remains simple, but the response time to driver input is slow causing discomfort
Solution Approach 1:
The control section actuates synchromesh mechanisms in advance based on detected driver intent (accelerator depression, shift lever position) before the actual shifting operation is completed. This preliminary action prepares the transmission for quick response when the driver performs rapid shift operations, reducing the perceived delay and improving responsiveness without requiring complex mechanical modifications
2Reliability
If the automatic transmission delays shifting operations, then the synchromesh mechanisms can engage properly, but the transmission cannot respond quickly to driver inputs
Solution Approach 1:
The system detects driver intent through accelerator depression amount and shift lever position, then pre-actuates the synchromesh mechanisms before the actual gear change is executed. This allows the transmission to be ready for immediate engagement when the driver performs rapid shifting, maintaining reliable engagement while minimizing the time delay
Solution Approach 2:
The control section continuously monitors driver operations (accelerator depression, shift lever position) and uses this feedback to determine when to actuate synchromesh mechanisms. This feedback loop allows the system to adapt its timing to match driver intent, ensuring reliable shifting while responding quickly to actual driver needs
Data Source
AI summary
An automatic transmission equipped with: a plurality of rotary shafts, including an output shaft for outputting driving force; a plurality of gears, including an output-side gear provided on the output shaft; a plurality of synchronization mechanisms, including an output-side synchronization mechanism for coupling the output shaft and the output-side gear; a shift position detection unit for detecting which of a plurality of shift positions, including a neutral position and a neutral position, has been selected; and a control unit for activating a synchronization mechanism other than the output-side synchronization mechanism and coupling a rotary shaft other than the output shaft and a gear other than the output-side gear when the shift position detection unit has detected the neutral position or a parking position.