Transmission Control Unit Ratio Correction via External Connector
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Solution Overview
Problem
Current transmission control systems in vehicles, particularly motorcycles, face challenges in distinguishing between a trial run and a wheelie run, leading to unintended correction of transmission ratio changes, which complicates calibration and testing processes.
Innovation Solution
A transmission apparatus with an actuator, control unit, transmission ratio sensor, and front-wheel speed sensor that limits correction based on front-wheel rotation speed, allowing for smooth trial runs and calibration by connecting an external device, thereby suppressing unintended corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If correction based on front-wheel rotation speed is executed to suppress unintended ratio-change during turning, then reliability of transmission control is improved, but difficulty of detecting and measuring trial run conditions increases
Solution Approach 1:
The patent introduces an external device as an intermediary to detect trial run conditions and communicate this information to the control unit. This mediator resolves the contradiction by providing a reliable method to detect trial run states without complicating the existing front-wheel speed sensor system, allowing correction to be properly suppressed during calibration while maintaining reliability during normal operation.
Solution Approach 2:
The system performs preliminary detection of trial run conditions through external device connection status before executing transmission ratio correction. By checking whether the connector is connected to an external device in advance, the control unit can preemptively disable correction during calibration processes, preventing the contradiction between maintaining control reliability and avoiding interference with calibration.
2Stability of the object's composition
If ratio-change correction is executed during turning to maintain vehicle stability, then stability of vehicle control is improved, but productivity of calibration process decreases
Solution Approach 1:
The patent implements dynamic control of ratio-change correction by making it conditional on the detection of trial run states. The correction function is activated during normal operation to maintain vehicle stability during turning, but dynamically disabled when an external device is connected during calibration processes, thus resolving the contradiction between stability and calibration productivity.
Solution Approach 2:
The system changes the operational parameter of ratio-change correction based on the connection status of external devices. When calibrated mode is detected through external device connection, the correction parameter is modified to be disabled, allowing high-speed calibration without stability interference. During normal operation, the correction parameter is restored to maintain vehicle stability.
3Ease of operation
If automatic gear selection is implemented to simplify driver operation, then ease of operation is improved, but adaptability to special conditions (trial run, wheelie run) decreases
Solution Approach 1:
The patent implements feedback control by monitoring the connection status of external devices and using this information to adjust automatic gear selection behavior. During calibration modes detected through external device connection, the system receives feedback to suspend automatic correction, allowing special operational conditions to be accommodated while maintaining ease of operation during normal use.
Data Source
AI summary
A transmission apparatus mounted on a vehicle has a front-wheel speed sensor for sensing a rotation speed of a front wheel. A control unit has a ratio-change correction part that determines a correction in transmission control of the transmission apparatus using the rotation speed of the front wheel sensed by a front-wheel speed sensor. The control unit limits execution of the correction under a condition that an external device is connected to a connector. Thereby, the execution of the correction based on the rotation speed of the front wheel without a worker's intention during driving on a chassis dynamo may be suppressed.