Torque Vectoring Machine Vibration Control
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Solution Overview
Problem
Resonance vibrations in vehicle drivelines caused by torque vectoring in electrically propelled vehicles lead to increased noise and vibrations, outweighing the benefits of torque vectoring.
Innovation Solution
Adjusting the torque output of a torque vectoring electric machine based on the speed difference between the actual wheel speed and the machine's speed to reduce resonance vibrations, without the need for mechanical dampeners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If torque vectoring electric machine is activated to transfer torque between wheels, then torque utilization efficiency is improved, but resonance vibrations and noise in driveline increase
Solution Approach 1:
The patent applies vibration control by actively managing the oscillations in the driveline. The controller monitors vibration levels and adjusts the torque vectoring electric machine operation to minimize resonance vibrations while maintaining torque transfer functionality. This allows the system to benefit from torque vectoring while suppressing harmful vibrations through controlled mechanical vibration management.
Solution Approach 2:
The patent changes operating parameters of the torque vectoring electric machine based on detected vibration conditions. The controller adjusts torque magnitude, frequency, and phase parameters dynamically to avoid resonant frequencies and reduce vibration amplitude. This parameter adaptation allows the system to maintain torque transfer efficiency while operating outside harmful resonance zones.
2Object-generated harmful factors
If mechanical dampeners are installed to reduce vibrations, then driveline noise is reduced, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical dampeners with an electronic control system that uses the torque vectoring electric machine to actively counteract vibrations. Instead of adding passive mechanical vibration suppression components, the system uses electronic torque modulation to achieve vibration reduction. This substitution eliminates the need for additional mechanical dampeners while maintaining vibration control effectiveness.
Solution Approach 2:
The torque vectoring electric machine serves dual functions: torque transfer and vibration suppression. The same motor used for torque vectoring is controlled to generate counter-vibrations that cancel harmful resonances. This self-service approach allows the existing component to handle multiple functions without requiring separate vibration control mechanisms, thereby reducing overall system complexity.
Data Source
AI summary
Methods and systems are provided for operating a vehicle that includes a torque vectoring electric machine. In one example, torque output of a torque vectoring electric machine is adjusted to reduce driveline torque disturbances when the torque vectoring electric machine is activated. The torque output is adjusted in response to a speed difference between a wheel speed and a speed of the torque vectoring electric machine.