Two-Speed PTO Transmission for Single-Motor EV Auxiliary Loads
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Solution Overview
Problem
Electric vehicles face challenges in efficiently powering non-propulsion loads due to varying mechanical systems and configurations, leading to increased financial expense and impracticality of single electric drive systems.
Innovation Solution
A two-speed transmission with a power take-off mechanism that bolts to the transmission case, allowing a single electric machine to power different mechanical loads and vehicles, operable in torque or speed control modes, and equipped with a controller for mode operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple dedicated electric machines are used to power non-propulsion loads, then the ability to drive different mechanical systems is improved, but the financial expense and system complexity increase
Solution Approach 1:
The transmission system is designed to perform multiple functions: it can propel the vehicle through gear ratios and simultaneously power non-propulsion mechanical loads through the power take-off mechanism. This allows a single transmission system to replace what would otherwise require multiple dedicated electric machines, reducing system complexity while maintaining versatility
2Adaptability or versatility
If multiple dedicated electric machines are used to power non-propulsion loads, then the ability to drive different mechanical systems is improved, but the financial expense increases
Solution Approach 1:
The transmission system serves as a universal platform that can accommodate different mechanical load configurations through the power take-off. Instead of manufacturing multiple vehicles with different dedicated electric machines, a single transmission design can be used across various applications, reducing manufacturing costs while maintaining adaptability to different mechanical systems
3Device complexity
If a single electric machine is used for both vehicle propulsion and external loads, then the electric configuration is simplified, but the control requirements increase
Solution Approach 1:
The system dynamically switches between different operational modes: torque control mode when propelling the vehicle and speed control mode when driving external mechanical loads. This dynamic adaptation allows a single electric machine to efficiently handle different operational requirements without requiring complex simultaneous control of multiple machines
Solution Approach 2:
The transmission system acts as an intermediary between the single electric machine and both the vehicle propulsion system and external mechanical loads. It manages the distribution and control of power, handling the complexity of mode switching and control requirements, while presenting a simplified electric configuration to the overall system
Data Source
AI summary
Methods and systems for providing power to a mechanical system of an electric vehicle are described. The methods and systems may be applied to vehicles that include hydraulically operated systems and that are propelled via an electric machine. The methods and systems may allow a single electric machine to propel a vehicle and drive an external load when the vehicle is not being propelled.