Manual Transmission Drive Unit Torque Control
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Solution Overview
Problem
Existing drive unit shifting methods, such as dual clutch transmissions, often result in reduced output torque during upshifts due to lower transmission ratios, leading to decreased driving comfort as engine torque adjustments occur primarily during the speed synchronization phase, causing noticeable drops in torque applied to the output shaft.
Innovation Solution
Adapting engine torque to match an externally specified torque target value during the torque transfer phase, with adjustments made through linear or progressive increases/decreases before and potentially during the engine speed synchronization phase, ensuring the output torque is maintained at a higher level during upshifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If engine torque is adapted only during the engine speed synchronization phase, then the shifting process is simple to control, but the output torque drops significantly during upshifts, reducing driving comfort
Solution Approach 1:
The engine torque is adapted during the torque transfer phase, which occurs before the engine speed synchronization phase. This preliminary torque adaptation ensures that the output torque does not drop significantly during the subsequent synchronization phase, thereby improving driving comfort while maintaining controllable complexity
Solution Approach 2:
The control system continuously monitors the torque transfer phase and adjusts the engine torque accordingly to compensate for the upcoming torque reduction. This feedback mechanism allows the system to anticipate and counteract the output torque drop, resolving the contradiction between control simplicity and maintaining stable output torque
2Object-affected harmful factors
If engine torque is increased during the torque transfer phase, then the output torque remains stable during upshifts, but the engine torque adjustment complexity increases
Solution Approach 1:
The engine torque is increased during the torque transfer phase, which is a predetermined phase occurring before the synchronization phase. This preliminary torque increase is planned and executed in advance, ensuring output torque stability without requiring complex real-time adjustments during the critical synchronization phase
Solution Approach 2:
The engine torque is dynamically adjusted during the torque transfer phase based on the shifting conditions. This dynamic adjustment allows the system to maintain optimal output torque while adapting to varying driving conditions, managing the complexity through intelligent control rather than mechanical complexity
Data Source
Figure 1~4
AI summary
The method involves connecting an engine with a drive through couplings provided on transmission path over gears. In the shifting process, a phase of torque transmission from one coupling to another coupling connects a phase of synchronization of the engine speed (n-Mot). After the synchronization of the engine speed, an engine torque of predetermined torque target value is adjusted .The adjustment of the engine torque takes place during the phase of the torque transmission.