EV Power Distribution Coupling for Wheel and Auxiliary Modes
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Solution Overview
Problem
Electric vehicles face inefficiencies due to permanent wheel-to-motor coupling, which limits power availability for auxiliary systems when stationary, leading to excessive power consumption and reduced range, as vehicle-propelling electric motors are too powerful and inefficient for powering auxiliary systems independently.
Innovation Solution
A power distribution system that mechanically couples an electric motor to both the vehicle's road wheels and auxiliary units, allowing switching between operating modes to selectively transfer mechanical power among these components, enabling efficient power usage by decoupling the motor from the wheels when auxiliary power is needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dedicated electric motor is used for each auxiliary system, then the auxiliary system can operate independently when the vehicle is stationary, but the vehicle complexity, weight, and cost increase
Solution Approach 1:
The vehicle-propelling electric motor is designed to perform multiple functions: it can power the wheels when the vehicle is moving and power auxiliary systems when the vehicle is stationary. The motor controller enables the motor to switch between these different functions based on vehicle operating conditions, eliminating the need for separate dedicated motors for each auxiliary system
2Adaptability or versatility
If the vehicle-propelling electric motor is used to power auxiliary systems when the vehicle is stationary, then the auxiliary systems can be powered, but the motor is too powerful and inefficient for such small power requirements
Solution Approach 1:
The motor controller dynamically adjusts the motor's operating parameters based on the specific power requirements. When powering auxiliary systems, the controller modulates the motor to operate at lower power levels appropriate for the auxiliary load, rather than operating at the high power levels required for wheel propulsion. This dynamic adjustment optimizes energy efficiency across different operating conditions
3Speed
If the vehicle-propelling electric motor is permanently coupled to the wheels, then the motor can continuously propel the vehicle, but the motor cannot power auxiliary systems when the vehicle is stationary
Solution Approach 1:
The power distribution system dynamically reconfigures the mechanical coupling between the motor, wheels, and auxiliary systems based on operating conditions. When the vehicle is moving, the motor is coupled to the wheels for propulsion. When the vehicle is stationary, the coupling to the wheels is disengaged and the motor is coupled to the auxiliary systems, enabling the motor to adapt its function in real-time
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 solution allows for efficient operation of auxiliary systems when the vehicle is stationary by utilizing the electric motor for auxiliary power without wasting energy on wheel propulsion, thereby enhancing the vehicle's range and reducing complexity and weight.
Implementation Method 1
An electric motor of the electric vehicle is provided. The power distribution system is mechanically coupled to the electric motor
Data Source
AI summary
Described herein are electric vehicles comprising power distribution systems and methods of operating thereof. Specifically, a power distribution system is mechanically coupled to an electric motor, a road wheel, and an auxiliary unit. This system is configured to switch among multiple operating modes and selectively transfer mechanical power among the electric motor, wheel, and auxiliary unit. For example, the power distribution system is configured to transfer mechanical power between the electric motor and the road wheel, but not the auxiliary unit, when switched to a wheel operating mode. The power distribution system is configured to transfer mechanical power between the electric motor and the auxiliary unit, but not the road wheel, when switched to an auxiliary operating mode. The power distribution system is configured to transfer mechanical power between the electric motor, the auxiliary unit, and the road wheel when the system is switched to a combined operating mode.