Torque Vectoring Apparatus with Planetary Gear Sets
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing torque vectoring systems for vehicles, particularly in electric vehicles, face challenges in efficiently controlling torque distribution between wheels to enhance agility and stability, especially during cornering, and often result in power loss and increased fuel consumption.
Innovation Solution
A torque vectoring apparatus comprising a speed reduction device, a differential device, a torque vectoring control motor, and two planetary gear sets that adjust torque ratios between left-side and right-side output shafts, minimizing power loss and optimizing fuel efficiency by disconnecting torque transmission when excessive vehicle speed is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque vectoring control is continuously applied to improve cornering performance and stability, then vehicle dynamics are enhanced, but power loss increases and fuel consumption rises
Solution Approach 1:
The torque vectoring control is applied periodically rather than continuously. The control motor operates only when cornering is detected and disengages when straight-line driving is detected, creating a periodic action pattern that reduces energy consumption while maintaining cornering performance when needed
Solution Approach 2:
The system dynamically adjusts torque distribution based on real-time driving conditions. The control motor's engagement and disengagement is determined by detecting vehicle speed and steering angle, allowing the system to adapt between active torque vectoring during cornering and passive operation during straight-line driving
2Reliability
If a torque vectoring apparatus is added to the differential device to enable independent torque control, then agility and handling performance are improved, but device complexity increases
Solution Approach 1:
The torque vectoring control motor is integrated within the differential device structure rather than being a separate external component. The control motor shares the differential case and connects to the planetary gear sets, merging multiple functions into a single integrated assembly that reduces overall system complexity
Solution Approach 2:
The control motor serves multiple functions: it provides torque vectoring control, acts as a brake during straight-line driving to reduce power loss, and can be disengaged completely when not needed. This multi-functionality reduces the need for additional separate components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus improves cornering performance and stability by dynamically controlling torque distribution, reduces power loss, and minimizes fuel consumption by using symmetric planetary gear sets and a torque disconnection function applicable to various electric vehicles.
Implementation Method 1
two planetary gear sets and controlling a torque ratio of the split torques output to the left-side and right-side output shafts by a torque received from the torque vectoring control motor
Data Source
AI summary
A torque vectoring apparatus receiving a vehicle driving torque from a motor-generator may include a speed reduction device engaged to the motor-generator and configured to reduce a rotation speed received from the motor-generator, a differential device engaged to the speed reduction device and configured to receive the speed-reduced torque from the speed reduction device and to differentially output torques to left and right output shafts, a vectoring control motor outputting a control torque, and a torque vectoring apparatus engaged to the vectoring control motor and including two planetary gear sets and controlling a torque ratio output to the left and right output shafts by the control torque of the torque vectoring control motor, wherein the differential device includes a differential case receiving a torque from the speed reduction device, the differential case is mounted between the two planetary gear sets rotatably on a connecting member connecting the two planetary gear sets, and side gears in the differential case are fixedly connected to the two planetary gear sets respectively.