Dual-Motor Electric Driveline With Selective PTO Coupling
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Solution Overview
Problem
Existing electric drivelines for off-highway vehicles face challenges in achieving high energy efficiency while powering both traction and work functions, often resulting in increased material costs and energy inefficiency due to the need for separate motors or traditional torque-converter transmissions.
Innovation Solution
A dual motor electric driveline with a transmission, power take-off, and two electric motors, where one motor is selectively engaged with the transmission and the other with the power take-off through clutching devices, allowing for efficient power distribution and cost-effective manufacturing by using smaller motors and flexible coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If separate electric motors are provided for driving the wheels and the work functions, then energy efficiency is improved, but material costs increase
Solution Approach 1:
The driveline is segmented into two independent power paths: one from the first electric motor through the transmission to the wheels, and another from the second electric motor through the PTO to the work functions. This segmentation allows each motor to operate independently at optimal efficiency points while providing the flexibility to use smaller, more cost-effective motors for each function rather than one oversized motor.
2Device complexity
If a torque-converter transmission is used to couple the electric motor to both traction and auxiliary devices, then device complexity is reduced, but energy efficiency deteriorates
Solution Approach 1:
The power transmission path is segmented into separate channels: the first electric motor connects to the transmission for wheel drive, while the second electric motor connects directly to the PTO for work functions. This eliminates the need for a torque-converter transmission to split power between functions, avoiding the energy losses associated with torque converters operating as speed-decouplers.
3Adaptability or versatility
If the torque-converter is used as speed-decoupler, then adaptability is improved, but energy efficiency deteriorates
Solution Approach 1:
The system dynamically switches between different power sources and transmission paths based on operational requirements. The clutching devices enable the second electric motor to be selectively engaged with either the PTO or the transmission input, allowing the system to adapt to different work conditions while maintaining high efficiency by direct motor-PTO coupling when work functions are the priority.
Data Source
AI summary
Methods and sysemteds for a driveline, comprising: a transmission having an input and an output, a power take-off (PTO), a first electric motor drivingly engaged or selectively drivingly engaged with the input of the transmission, a second electric motor, a first clutching device, and a second clutching device, wherein the second electric motor is selectively drivingly engaged with the input of the transmission through the first clutching device, and wherein the second electric motor is selectively drivingly engaged with the PTO through the second clutching device. The present document further relates to a vehicle including said dual motor electric driveline, and to a method of controlling said dual motor electric driveline.