Transmission Control System Clutch Engagement for Shift Shock Reduction
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Solution Overview
Problem
Existing transmission control systems fail to effectively suppress engine speed increases during manual gear shift operations, particularly when shifting from high to low gears, leading to potential shift shocks and inefficient engine performance.
Innovation Solution
A transmission control system that includes a main transmission and a sub transmission, where a controller manages clutch engagement and disengagement based on engine speed thresholds, relaxing clutch engagement when engine speed exceeds a certain limit during gear shifts and stopping fuel injection and ignition when engine speed reaches specific limits to prevent speed increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sub transmission is mechanically shifted from high to low gear in response to a shift operation, then the gear shift action is performed, but the engine speed increases excessively causing shift shock
Solution Approach 1:
The controller applies preliminary anti-action by detecting when the sub transmission is mechanically shifted from high to low gear and proactively increasing clutch engagement force before the engine speed can increase excessively. This preemptive countermeasure suppresses the harmful engine speed surge that would otherwise cause shift shock, resolving the contradiction between performing the gear shift action and preventing excessive engine speed increase.
2Stability of the object's composition
If the clutch engagement is maintained during manual gear shift operation, then the transmission of rotational driving force is continuous, but the engine speed increases due to the gear shift action
Solution Approach 1:
The controller applies dynamics by dynamically adjusting the clutch engagement force based on real-time detection of gear shift operations and engine speed. Rather than maintaining static clutch engagement, the system adaptively increases clutch force during downshifts to control engine speed, and normalizes engagement after the shift completes. This dynamic adjustment resolves the contradiction between maintaining stable clutch engagement and preventing excessive engine speed increase during manual gear shifts.
3Ease of operation
If the sub transmission allows free gear shift operation, then the shift operation is simple, but the engine speed control is insufficient leading to performance loss
Solution Approach 1:
The controller applies feedback by continuously monitoring gear shift operations of the sub transmission and using this information to automatically adjust clutch engagement force. The system detects when a downshift occurs and responds by increasing clutch force to control engine speed, then normalizes engagement after the shift. This closed-loop feedback mechanism maintains simple manual operation while ensuring reliable engine speed control, resolving the contradiction between ease of operation and engine speed control reliability.
Data Source
AI summary
A transmission control system can include a main transmission. The transmission control system can also include a sub transmission that has two forward transmission gears mechanically shiftable in response to a shift operation. The transmission control system can further include a controller that shifts the transmission gears of the main transmission by activating a shift control motor, and control the clutches configured to enable and disable transmission of a rotational driving force of an engine. When one forward transmission gear of the sub transmission is shifted to the other forward transmission gear in response to the shift operation, the controller can relax engagement of the clutch if an engine speed exceeds a clutch release speed.