Electromechanical Actuator Feed-In Control for Battery Reserve Reduction
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Solution Overview
Problem
The existing energy storage systems in motor vehicles face a capacity reduction due to the need for a reserve to absorb stochastic and unpredictable energy feedback, which reduces the overall capacity available for other functions and increases instability in the onboard electrical system.
Innovation Solution
A method is introduced where the feed-in efficiency of an electromechanical actuator is set to 50% or less during stochastic feed-in processes, converting only a small proportion of mechanical power into electrical power and the rest into thermal power, thereby reducing the reserve required in the energy storage system, allowing for increased usable capacity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the energy storage device maintains a capacity reserve to absorb stochastic feed-in processes, then the stability of the energy system is ensured, but the total capacity available for other purposes is reduced
Solution Approach 1:
The actuator's operating point is dynamically adjusted between a first operating point (high feed-in efficiency) and a second operating point (low feed-in efficiency) based on real-time system state. This dynamic adaptation allows the system to optimize between energy recovery and stability requirements, eliminating the need for a fixed capacity reserve.
Solution Approach 2:
The feed-in efficiency parameter is explicitly changed by switching between two distinct operating points. The first operating point maximizes electrical power generation for energy recovery, while the second operating point minimizes feed-in power to prevent overloading. This parameter change strategy resolves the contradiction by making feed-in efficiency a controllable variable rather than a fixed characteristic.
2Productivity
If the actuator operates at high feed-in efficiency to maximize energy recovery, then more electrical power is generated, but the energy storage device may become overloaded by unpredictable feed-in processes
Solution Approach 1:
The control device continuously monitors the state of the energy storage device and the actuator's operating conditions, then adjusts the actuator's operating point accordingly. This feedback mechanism ensures that high feed-in efficiency is maintained only when the energy storage device can safely absorb the generated power, while automatically switching to low feed-in efficiency when approaching capacity limits, thus preventing overload while maximizing energy recovery.
Solution Approach 2:
The system transitions from a static operating mode to a dynamic one where the actuator's operating point is continuously adapted based on real-time system state. This allows the system to exploit high feed-in efficiency during favorable conditions while automatically protecting against overload during critical periods, resolving the contradiction between productivity and reliability.
3Reliability
If a capacity reserve is allocated in the energy storage device to handle stochastic feed-back, then the system can absorb unpredictable energy feed-in, but the usable capacity for other functions is reduced
Solution Approach 1:
The actuator itself provides the stability function by dynamically adjusting its feed-in efficiency, eliminating the need for a separate capacity reserve in the energy storage device. The actuator's ability to switch between high and low feed-in efficiency modes creates a self-regulating system that handles unpredictable feed-in processes without requiring additional storage capacity, thus maintaining full usable capacity for other functions.
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 electrical power fed into the energy storage system, minimizing the reserve needed, thereby optimizing energy regeneration phases, improving CO2 potential, and enhancing the overall efficiency of the motor vehicle by increasing the capacity available for other functions.
Implementation Method 1
the actuator is designed to convert mechanical power into electrical power, which electrical power is fed into an energy storage device of the motor vehicle
Implementation Method 2
a feed-in operating point of the actuator is set in which the feed-in efficiency is 50% or less. This enables that only a small proportion of the mechanical power acting on the actuator is still converted into electrical power
Data Source
AI summary
A method for operating at least one electromechanical actuator of a motor vehicle, wherein the actuator is designed to convert mechanical power into electrical power during operation of the motor vehicle in stochastic feed-in processes as a function of a feed-in efficiency predetermined by a feed-in operating point of the actuator, which electrical power is fed into an energy storage device of the motor vehicle, includes detecting the start of a feed-in process by a means of detection and, at the start of the feed-in process, setting a feed-in operating point of the actuator, wherein the feed-in efficiency is 50% or less.