Multi-Axle Drive Clutch Control for Faster Shifting
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Solution Overview
Problem
Existing multi-axle drive devices face inefficiencies in rapidly shifting to multi-axle operation, as they require full engagement of clutches, leading to energy loss and delayed torque distribution during transitions between operating states.
Innovation Solution
A method where the synchronizing clutch is partially engaged when the first shifting threshold is exceeded, and the separating clutch is engaged only when the second shifting threshold is reached, allowing for preparatory measures to accelerate the connecting shaft and differential transmission, thereby facilitating faster shifts between operating states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the synchronizing clutch and separating clutch are fully engaged simultaneously to switch to multi-axle operation, then the torque distribution is achieved, but the switching time is prolonged and energy loss increases due to the inertia of the connecting shaft and differential transmission
Solution Approach 1:
The synchronizing clutch is engaged in advance before the separating clutch to pre-accelerate the connecting shaft and differential transmission. This preliminary action reduces the inertia barrier before the separating clutch engages, enabling faster and more energy-efficient switching to multi-axle operation.
Solution Approach 2:
The clutch engagement process is divided into two sequential stages: first engaging the synchronizing clutch to prepare the connecting shaft, then engaging the separating clutch to complete the torque distribution. This segmentation allows the system to overcome inertia more efficiently by breaking down the single large engagement into two controlled steps.
2Productivity
If the synchronizing clutch is partially engaged to pre-accelerate the connecting shaft, then the switching speed is improved, but the control complexity increases
Solution Approach 1:
The synchronizing clutch is designed to provide continuous or discrete adjustment of synchronizing torque, allowing dynamic control of the pre-acceleration process. This dynamic capability enables the system to adapt the engagement level to match the inertia of the connecting shaft and differential transmission, optimizing switching speed while maintaining manageable control complexity.
Solution Approach 2:
The system changes the torque transmission parameter by partially engaging the synchronizing clutch at a controlled level before full engagement. This parameter adjustment allows the connecting shaft to be pre-accelerated to an optimal speed, reducing the energy required for the subsequent separating clutch engagement and improving overall switching performance.
Data Source
AI summary
A device and a method for operating a multi-axle drive device. The multi-axle drive device has a synchronizing clutch present in an operative connection between a first output shaft and a connecting shaft and at least one separating clutch present in an operative connection between the connecting shaft and a second output shaft. The synchronizing clutch and the separating clutch are disengaged in a first operating state and are engaged in a second operating state. When a shifting variable exceeds a first shifting threshold during the first operating state, the synchronizing clutch is at least partially engaged and the separating clutch is engaged only when a second shifting threshold is exceeded.