eVTOL Hybrid Battery Switching for Hover-to-Cruise Efficiency
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Solution Overview
Problem
Existing eVTOL tiltrotor aircraft face challenges in efficiently transitioning between hover and cruise modes, with inefficiencies in power consumption and range due to single-type battery systems, and require improved stability and maneuverability for urban flight operations.
Innovation Solution
Implementing a hybrid power system with variable pitch propellers and a combination of high discharge rate and high energy batteries, along with a fixed wing configuration and trailing edge mounted tilt rotors, to optimize power usage and enhance flight efficiency and range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-type battery system is used in eVTOL tiltrotor aircraft, then the system complexity is reduced, but the flight range and power consumption efficiency deteriorate
Solution Approach 1:
The battery system is segmented into two distinct types: high discharge rate batteries for hover and transition modes, and high energy batteries for cruise mode. This segmentation allows each battery type to be optimized for its specific operational requirement, improving overall power consumption efficiency while managing complexity through functional separation
Solution Approach 2:
The power system dynamically switches between different battery types based on flight mode. The control system monitors flight phase and automatically selects the appropriate battery configuration, enabling adaptive optimization of power consumption without requiring manual intervention or complex mechanical reconfiguration
2Ease of manufacture
If a single-type battery system is used in eVTOL tiltrotor aircraft, then the manufacturing and maintenance processes are simplified, but the flight range is reduced
Solution Approach 1:
The battery system is segmented into two distinct types: high discharge rate batteries for hover and transition modes, and high energy batteries for cruise mode. This segmentation allows each battery type to be optimized for its specific operational requirement, improving overall power consumption efficiency while managing complexity through functional separation
Solution Approach 2:
The system changes battery parameters (discharge rate vs. energy density) based on flight mode requirements. During hover and transition phases, high discharge rate batteries provide the necessary power bursts, while high energy batteries extend cruise duration, thereby increasing overall flight range without compromising manufacturing feasibility
3Productivity
If variable pitch propellers and hybrid power system are implemented, then flight efficiency and range are optimized, but the device complexity increases
Solution Approach 1:
The power system dynamically switches between different battery types based on flight mode. The control system monitors flight phase and automatically selects the appropriate battery configuration, enabling adaptive optimization of power consumption without requiring manual intervention or complex mechanical reconfiguration
Solution Approach 2:
The hybrid power system with variable pitch propellers serves multiple functions: it optimizes power consumption during hover, transition, and cruise modes while also enhancing flight range and operational envelope. The system integrates electrical and mechanical components that work together across different flight phases, providing multi-functional benefits despite increased complexity
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
The hybrid power system increases flight range and reduces power consumption by selectively using high discharge rate batteries for hover and transition phases, while high energy batteries support cruise mode, enhancing the aircraft's operational envelope and stability.
Implementation Method 1
a first power source of a hybrid power system includes a high discharge rate battery
Implementation Method 2
a second power source of the hybrid power system includes a high energy battery
Implementation Method 3
capable of vertical takeoff and landing, forward flight, and hovering
Implementation Method 4
the rotor is tilted from a hover position to a forward flight position
Data Source
AI summary
A first power source includes a high discharge rate battery and a second power source includes a high energy battery. An electronically activated switch switches between the first power source and the second power source in response to a control signal from a power controller. If the electronically activated switch fails, it fails with one of the first power source and the second power source in an open circuit position and with the other one of the first power source and the second power source in a closed circuit position. The power controller generates the control signal, including by: during a vertical landing associated with a vertical takeoff and landing (VTOL) vehicle, generating the control signal to switch from the high energy battery to the high discharge rate battery independent of a measured current.