Dual-Motor Transmission Layout for Compact EV Torque Vectoring
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Solution Overview
Problem
The development of high-performance electric vehicles is hindered by the increased volume and weight of current motors, which require additional mechanical mechanisms for functions like differential speed, differential lock, and vector control, leading to higher energy consumption and system size.
Innovation Solution
A vehicle power transmission system with two motor output shafts and two power output shafts connected by overlapping transmission mechanisms, including motor output gears, power output gears, and middle transmission gear structures, allowing for independent power delivery from two driving motors and enabling differential speed and vector control without additional mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional mechanical mechanisms (speed reduction mechanism, differential mechanism, vector adjustment mechanism) are provided in the transmission system to achieve differential speed, differential lock and vector control functions, then the transmission system can achieve the required functions, but the volume and weight of the transmission system increase significantly
Solution Approach 1:
The patent combines multiple transmission mechanisms (speed reduction, differential, and vector control mechanisms) into a single integrated transmission system. The planetary gear mechanism serves both as a speed reduction mechanism and as a differential mechanism, eliminating the need for separate mechanical differentials and vector adjustment mechanisms. This merging of functions directly reduces the overall volume and weight of the transmission system while maintaining all required functions.
Solution Approach 2:
The planetary gear mechanism is designed to perform multiple functions simultaneously: it acts as a speed reduction mechanism, a differential mechanism for differential speed control, and enables vector control through electronic modulation of motor speeds. This multi-functionality eliminates the need for dedicated separate mechanisms for each function, thereby reducing system volume and weight.
2Adaptability or versatility
If additional mechanical mechanisms are provided in the transmission system to achieve differential speed, differential lock and vector control functions, then the transmission system can achieve the required functions, but the weight of the transmission system increases significantly
Solution Approach 1:
The patent merges the differential lock function into the planetary gear mechanism by controlling the locking of planetary gears through the motor control system, eliminating the need for separate mechanical differential lock mechanisms. This integration significantly reduces the weight of the transmission system while maintaining the differential lock function.
Solution Approach 2:
The patent replaces traditional mechanical differential lock mechanisms with an electronic control system that modulates the speeds of the left and right driving motors to achieve differential lock effect. This substitution of mechanical components with electronic control reduces the weight and complexity of the transmission system.
3Adaptability or versatility
If additional mechanical mechanisms are provided in the transmission system to achieve differential speed, differential lock and vector control functions, then the transmission system can achieve the required functions, but the complexity of the transmission system increases
Solution Approach 1:
The patent combines vector control functionality into the motor control system rather than requiring separate mechanical vector adjustment mechanisms. By controlling the speeds and torques of the two driving motors independently, the system achieves vector control without adding mechanical complexity to the transmission system.
Solution Approach 2:
The patent replaces complex mechanical vector adjustment mechanisms with an electronic control system that modulates motor outputs. This substitution simplifies the mechanical transmission system while maintaining vector control capability through software-based control algorithms.
4Power
If the motor is designed for high power output, then the power performance of the electric vehicle is improved, but the volume and weight of the motor increase significantly
Solution Approach 1:
The patent divides the power transmission system into two separate driving motors, each responsible for one driving wheel. This segmentation allows each motor to be optimized for higher power density without requiring a single large motor, thereby reducing the overall volume while maintaining high power output capability.
Solution Approach 2:
The patent combines the functions of a single high-power motor with a mechanical transmission system into two smaller motors with direct drive capability. The planetary gear mechanism serves both as a speed reduction mechanism and as a differential mechanism, eliminating the need for a large single motor and reducing overall system volume.
Data Source
AI summary
Disclosed are a vehicle power transmission system and a vehicle power system. The vehicle power transmission system includes two motor output shafts, two power output shafts and two transmission mechanisms respectively connected between the two motor output shafts and the two power output shafts correspondingly. Each transmission mechanism includes a motor output gear, a power output gear and a middle transmission gear structure. The motor output gear is arranged on a motor output shaft, and the power output gear is arranged on a power output shaft. The middle transmission gear structure is in transmission connection with the motor output gear and the power output gear. The two power output shafts extend in a first direction, along the first direction, projections of the two motor output shafts are at least partially overlapped and/or projections of the two transmission mechanisms are at least partially overlapped.