Torque Vectoring Drive System with Dual Planetary Gears
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Solution Overview
Problem
Existing drive systems for motor vehicles lack the ability to efficiently and variably control driving dynamics, particularly in terms of yawing moment, which is crucial for enhanced maneuverability and stability.
Innovation Solution
A drive system incorporating a differential with two planetary gear sets and a torque vectoring unit connected to an electrical machine, allowing for redistribution of torque between sun gears and enabling adjustable yawing moments through control of the torque vectoring unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional differential is used, then the drive system is simple, but the ability to control driving dynamics and yawing moment is limited
Solution Approach 1:
The patent combines a differential with a torque vectoring unit into a single integrated drive system. The differential and torque vectoring unit share a common planet carrier and are coupled through planetary gear sets, allowing torque distribution and yawing moment control to be achieved within one unified structure rather than separate components.
Solution Approach 2:
The drive system performs multiple functions simultaneously: it distributes torque between wheels through the differential while also generating controllable yawing moments through the torque vectoring unit. The electrical machine serves both as a torque source and as a controller for yawing moment, enabling the system to adapt to various driving conditions.
2Adaptability or versatility
If torque is distributed uniformly to both wheels, then vehicle stability is maintained, but maneuverability and dynamic control are reduced
Solution Approach 1:
The drive system dynamically adjusts torque distribution between the wheels based on driving conditions. The electrical machine can vary the torque applied to each wheel in real-time, enabling the system to transition between stable uniform distribution and dynamic asymmetric distribution for enhanced maneuverability.
Solution Approach 2:
The system changes the torque parameter distribution between wheels to achieve different driving dynamics. By controlling the electrical machine to apply different torque levels to each wheel, the system can generate yawing moments that improve maneuverability while maintaining overall stability through controlled parameter variation.
3Adaptability or versatility
If a torque vectoring unit with electrical machine is added, then yawing moment control is improved, but device complexity increases
Solution Approach 1:
The torque vectoring unit is merged with the differential structure, sharing common components such as the planet carrier and planetary gear sets. This integration reduces the number of separate components compared to a conventional setup with separate differential and torque vectoring units, thereby limiting the increase in device complexity.
4Adaptability or versatility
If multiple planetary gear sets are used, then torque redistribution capability is enhanced, but manufacturing complexity increases
Solution Approach 1:
Multiple planetary gear sets are combined into a single integrated structure with a common planet carrier. This merging approach allows the gear sets to be manufactured and assembled as one unit rather than as separate components, reducing manufacturing complexity while maintaining enhanced torque redistribution capability.
Data Source
AI summary
A drive system for a motor vehicle includes a torque vectoring unit and a differential. The torque vectoring unit has an electrical machine for producing a torque. The differential has a common planet carrier, a first sun gear, a second sun gear, a first planetary gear set and a second planetary gear set. The first planetary gear set is rotatably mounted on the common planet carrier and in meshing engagement with the first sun gear. The second planetary gear set is rotatably mounted on the common planet carrier, in meshing engagement with the second sun gear and the first planetary gear set, connected to the torque vectoring unit, and arranged to redistribute the torque between the first sun gear and the second sun gear.