EV Power Distribution Layout for Stationary Auxiliary Drive
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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 the electric motor, wheel, and auxiliary unit, enabling efficient power distribution for both propulsion and auxiliary system operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
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 complexity, weight, and cost of the electric vehicle increases
Solution Approach 1:
The vehicle-propelling electric motor is designed to perform multiple functions: it can power the wheels during vehicle motion and power auxiliary systems when the vehicle is stationary. The motor controller enables the motor to switch between these different operational modes, eliminating the need for separate dedicated motors for each auxiliary system.
Solution Approach 2:
The system dynamically reconfigures the mechanical coupling between the electric motor and the wheels using a disengageable connection mechanism. When the vehicle is stationary, the connection is disengaged, allowing the motor to operate independently to power auxiliary systems. When the vehicle is in motion, the connection is engaged to transfer power to the wheels.
2Power
If the vehicle-propelling electric motor is permanently coupled to the wheels, then propulsion function is maintained, but power is not available for auxiliary systems when the vehicle is stationary
Solution Approach 1:
The mechanical coupling between the electric motor and the wheels is made dynamic rather than permanent. A disengageable connection mechanism allows the system to switch between engaged and disengaged states. When disengaged, the motor can provide power to auxiliary systems independently while the vehicle remains stationary. When engaged, the motor provides propulsion power to the wheels.
3Power
If a high-power vehicle-propelling electric motor is used, then sufficient power is available for propulsion, but the motor is inefficient and consumes excessive power when used for low-power auxiliary systems
Solution Approach 1:
The system dynamically switches the motor's operational mode based on vehicle state. When the vehicle is stationary and only auxiliary systems need power, the motor operates in a low-power mode directly coupled to the auxiliary systems, avoiding the energy inefficiency of using a high-power motor for low-power tasks. When propulsion is needed, the motor engages with the wheels to provide full power capability.
Solution Approach 2:
The power delivery path is segmented into separate pathways: one for propulsion (motor to wheels) and one for auxiliary systems (motor to auxiliary units). This segmentation allows the motor to deliver appropriate power levels through the appropriate pathway, improving efficiency by matching power output to actual demand.
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.