Transmission Control via Gearbox Temperature for Shift Shock Reduction
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Solution Overview
Problem
Electronically controlled transmissions with a single drive motor for straddle type vehicles experience significant shift shock during continuous running due to variations in clutch engagement state, primarily caused by temperature changes in the gear box, which complicates the structure and increases cost when attempting to mitigate this issue with multiple sensors.
Innovation Solution
A transmission system with a shift shaft, actuator, and gear box that controls the actuator based on the temperature of the gear box to adjust the clutch engagement, reducing shift shock without the need for a complex structure, using a control method that adjusts the actuator's operation to minimize clutch engagement state variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensors are provided in the transmission to minutely adjust the shift operation, then variation in shift shock magnitude is reduced, but the structure becomes complicated and simplicity is lost
Solution Approach 1:
The system uses the drive motor itself to detect temperature changes through its own operational characteristics (current, voltage, or temperature sensors on the motor) rather than adding separate sensors throughout the transmission. The control unit processes this self-generated data to adjust shift operations, eliminating the need for multiple external sensors while maintaining reliability.
Solution Approach 2:
The drive motor serves multiple functions: it performs the shift operation mechanically and simultaneously provides temperature detection capability through integrated sensors or electrical characteristics. This multi-functionality reduces the need for separate dedicated temperature sensors in the transmission system.
2Device complexity
If the shift shaft is driven by a single drive motor, then the transmission is simple and low cost, but variation in shift shock magnitude occurs during continuous running
Solution Approach 1:
The control unit continuously monitors temperature data from the drive motor or gear box and uses this feedback to dynamically adjust the shift operation parameters. This closed-loop control compensates for temperature-induced variations in clutch engagement characteristics, maintaining consistent shift shock levels throughout continuous operation while preserving the single-motor simple structure.
Solution Approach 2:
The system changes operational parameters (such as shift speed, timing, or actuator activation characteristics) based on detected temperature conditions. By dynamically adjusting these parameters in response to thermal changes, the system maintains reliable and consistent shift performance without adding structural complexity.
Data Source
AI summary
An electronically controlled transmission in which a single drive motor is used to drive a shift shaft, in which shift shock is reduced during continuous running. The transmission has a shift shaft, an actuator, a gear box and a control portion. The actuator causes the shift shaft to rotate. The gear box includes a gear shift mechanism, a clutch mechanism, and a crank case that houses the gear shift mechanism and the clutch mechanism. The gear shift mechanism is activated in association with rotation of the shift shaft. The clutch mechanism connects and disconnects transmission of power to the gear shift mechanism from the engine in association with rotation of the shift shaft. The control portion controls the actuator based on the temperature of the gear box.