Electric Machine Non-Torque Output Control for EV Deceleration
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Solution Overview
Problem
Electric vehicles rely on electric machines that primarily maximize torque output, neglecting non-torque output which can be utilized to achieve desired conditions such as deceleration without friction brakes, thermal energy increase, and efficient energy management during deceleration and descent.
Innovation Solution
The method involves an electric machine that maintains torque output while intentionally increasing non-torque output to produce specific conditions in electric vehicles, such as deceleration during descent or increasing thermal energy in transmission fluid, by using a controller to calculate and manage non-torque output based on device temperatures and environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If electric machine operates to maximize torque output, then torque output is improved, but non-torque output is insufficient to achieve desired conditions such as deceleration and thermal energy increase
Solution Approach 1:
The electric machine controller dynamically adjusts operating parameters to intentionally increase non-torque output when desired conditions are detected, transitioning from a static torque-maximization mode to a dynamic mode that balances torque output with non-torque output generation for deceleration, heating, and energy management
Solution Approach 2:
The system changes operating parameters of the electric machine to produce increased non-torque output, adjusting electrical input power and machine operating state to generate thermal energy and enable deceleration without friction brakes, thereby achieving multiple desired conditions
2Adaptability or versatility
If non-torque output is intentionally increased, then desired conditions such as deceleration and thermal energy increase are achieved, but the ratio of torque output to electrical input power decreases by at least ten percent
Solution Approach 1:
The system converts what would normally be wasted non-torque output into a beneficial resource by intentionally generating thermal energy through controlled non-torque output, using the previously harmful energy loss to heat transmission fluid and achieve deceleration, thereby transforming energy waste into useful functions
Solution Approach 2:
The electric machine provides multiple functions including propulsion, deceleration, and thermal management through its non-torque output, enabling the vehicle to self-regulate temperature and achieve deceleration without external friction brakes, making the system self-sufficient for multiple operational needs
3Speed
If friction brakes are used for deceleration, then deceleration is achieved, but thermal energy is wasted and energy efficiency is reduced
Solution Approach 1:
The system replaces the mechanical friction brake system with an electrical control approach, using the electric machine's non-torque output to generate electromagnetic braking force for deceleration, thereby eliminating the need for friction-based mechanical brakes and reducing energy loss as waste heat
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
This approach reduces the torque output to electrical input power ratio by at least ten percent, enabling efficient deceleration without friction brakes, thermal energy increase, and optimized energy management, thereby enhancing vehicle performance and fuel efficiency.
Implementation Method 1
The electric machines receive electrical power and produce mechanical power to drive the vehicle
Implementation Method 2
the desired condition is an increasing of thermal energy in a fluid of the electric vehicle
Data Source
AI summary
An example method includes operating an electric machine to produce a torque output and a non-torque output. The method maintains the torque output and intentionally increases the non-torque output to produce a desired condition in an electric vehicle.