Torque Vectoring Device Using Selective Connector
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Solution Overview
Problem
Existing vehicle differential systems face challenges in navigating rough terrain due to differences in road surface friction between left and right driving wheels, limiting their ability to escape from such conditions effectively.
Innovation Solution
A torque vectoring device is introduced, comprising a differential and planetary gear devices with a selective connector that allows active control of torque distribution between the driving wheels, enabling improved vehicle performance by adjusting speed and torque according to the vehicle's traveling situation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a differential is used to allow speed difference between left and right driving wheels, then vehicle turning capability is improved, but vehicle ability to escape from rough terrain is worsened
Solution Approach 1:
The patent applies dynamics by making the torque distribution characteristics of the differential system adjustable rather than fixed. The torque vectoring device dynamically changes the torque distribution between left and right driving wheels based on driving conditions, allowing the system to adapt between providing speed difference for turning and preventing differential wheel spin for rough terrain escape
Solution Approach 2:
The patent changes the parameter of torque distribution ratio in the differential system. By using planetary gear devices with variable transmission ratios and torque vectoring mechanisms, the system can adjust the torque distribution parameter from equal distribution (for rough terrain) to asymmetric distribution (for turning), resolving the contradiction between these two opposing requirements
2Reliability
If torque vectoring technology is implemented to actively control torque applied to left and right driving wheels, then vehicle traveling performance is improved, but device complexity increases
Solution Approach 1:
The patent merges the torque vectoring function with the existing differential system by integrating planetary gear devices into the differential case. This combination allows torque vectoring control to be implemented without adding completely separate control systems, thereby improving vehicle traveling performance while limiting the increase in device complexity
Solution Approach 2:
The planetary gear devices in the torque vectoring system serve multiple functions: they provide torque distribution between left and right driving wheels, enable torque vectoring control for improved traveling performance, and can operate in different modes (torque vectoring mode and driving mode) depending on driving conditions, making the system multi-functional
Data Source
AI summary
A torque vectoring device for a vehicle includes: a differential; a first planetary gear device including a first rotating element fixed to a transmission case and a second rotating element connected to a differential case of the differential; a second planetary gear device including a first rotating element connected to a motor, and a third rotating element connected to a third rotating element of the first planetary gear device; and a selective connector configured such that a second rotating element of the second planetary gear device can be selectively connected to one of the third rotating element of the second planetary gear device and a selected drive shaft which is one of two drive shafts coupled to the differential.