Vehicle Transmission Shifter Control for Swift Gear Changes
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Solution Overview
Problem
Existing transmission systems for vehicles require preliminary disengagement of the transmission clutch to shift gears smoothly and swiftly, which limits shifting time and makes sequential upshifts or downshifts across multiple gear positions difficult.
Innovation Solution
A transmission system where the shift driving mechanism and transmission clutches are controlled to disengage the shifter from the current gear position after engaging it with the next gear position, with one transmission clutch remaining engaged to facilitate smooth and swift gear shifts without preliminary clutch disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the transmission clutch is disengaged prior to shifter movement to enable smooth gear disengagement, then the shifter can be easily disengaged from the current gear position, but the shifting time cannot be shortened and sequential shifting across multiple gear positions becomes difficult
Solution Approach 1:
The system engages the shifter with the next gear position's transmission gear before disengaging the transmission clutch. This preliminary engagement action allows the shifter to be positioned for the next gear while the clutch is still engaged, enabling smoother and faster sequential shifting operations without requiring complete clutch disengagement before each gear change.
Solution Approach 2:
The control unit dynamically coordinates the timing of clutch engagement/disengagement with shifter movement based on the desired gear position changes. By dynamically adjusting when the clutch is engaged or disengaged relative to shifter position, the system optimizes both the smoothness of disengagement and the speed of shifting, allowing sequential gear changes without unnecessary clutch operations.
2Productivity
If the transmission clutch is disengaged each time for sequential gear shifts, then each gear position can be shifted, but the transmission clutch is engaged and disengaged repeatedly making smooth and swift shifting difficult
Solution Approach 1:
The control unit maintains the transmission clutch in an engaged state across multiple sequential gear shifts when possible, avoiding repeated disengagement and engagement cycles. By keeping the clutch continuously engaged during sequential shifting operations, the system reduces operational complexity and achieves smoother, faster gear changes while maintaining full gear position shifting capability.
3Ease of operation
If the shifter is engaged with the next gear position's transmission gear while the transmission clutch is engaged, then the shifter can be easily disengaged from the current gear position, but power transmission must be properly managed
Solution Approach 1:
The control unit monitors the gear position, clutch state, and shifter position to determine the optimal timing for clutch engagement and disengagement. This feedback control ensures that the clutch is disengaged at the appropriate moment when the shifter is engaging the next gear position, preventing power transmission conflicts and ensuring reliable power flow to the correct gear while still enabling easy shifter disengagement from the current gear.
Data Source
AI summary
A transmission system for a vehicle has a shift driving mechanism which operates, under control by a control unit, at the time of shifting the gear position, to disengage a transmission gear of a current gear position and a shifter from each other after engaging a transmission gear of a next gear position and a shifter with each other in a condition where a transmission clutch that transmits power to the transmission gear of the next gear position is in an engaged state. This ensures smoother and swifter shifting of gear position.