Battery Pack Voltage Sag Detection for Motor Performance Control
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Solution Overview
Problem
Existing battery packs with different capabilities, due to design differences or degradation, exhibit varying voltage drops (voltage drops) that existing technologies fail to efficiently measure and manage, leading to interoperability issues and inefficiencies in power tool systems.
Innovation Solution
Utilization of metal sulfides (e.g., FeS2, CuS, CuFeS2) as mercury removal adsorbents, which contact with flue gas and waste liquid, adsorbing and converting Hg0 from flue gas and Hg2+ from waste liquid into stable mercury sulfide compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a common interface format is used for battery packs to improve interoperability, then users can easily swap battery packs between different tools, but battery packs with different capabilities (different internal resistances) exhibit varying voltage drops that existing technologies fail to efficiently measure and manage
Solution Approach 1:
The system performs a preliminary voltage measurement during a brief test period immediately when the battery pack is connected to the power tool, before normal operation begins. This preliminary action characterizes the battery pack's voltage drop characteristics, allowing the controller to subsequently manage power delivery appropriately for that specific battery capability without requiring complex ongoing measurements during tool operation
Solution Approach 2:
The patent replaces complex mechanical or hardware-based measurement systems with an electronic control approach. The controller uses software-based voltage monitoring and measurement during a test period to characterize battery properties, substituting what would traditionally require complex hardware circuitry with a simpler electronic control solution that leverages the existing power delivery pathway
2Measurement precision
If voltage drop measurement is performed during normal operation, then battery capability can be identified, but this may interfere with tool performance and user experience
Solution Approach 1:
The measurement and characterization of battery capability is performed in advance during a brief test period before the tool enters normal operation mode. This preliminary characterization allows the system to store and use the battery's voltage drop profile during subsequent tool operation without requiring continuous measurements that would interfere with productivity
Solution Approach 2:
The test period is designed to be brief and efficient, rushing through the necessary voltage measurements quickly to characterize the battery pack without creating a noticeable delay or interruption to the user experience. The system skips detailed ongoing measurements during normal operation, relying instead on the preliminary characterization data
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
Achieves efficient, cost-effective, and environmentally friendly simultaneous removal of Hg0 from flue gas and Hg2+ from waste liquid, avoiding secondary pollution and reducing operational costs.
Implementation Method 1
Utilization of metal sulfides (e.g., FeS2, CuS, CuFeS2) as mercury removal adsorbents, which contact with flue gas and waste liquid, adsorbing and converting Hg0 from flue gas and Hg2+ from waste liquid into stable mercury sulfide compounds
Data Source
AI summary
A device may include an interface configured to receive a battery pack, a sensor configured to detect a voltage of the battery pack, an electric motor, and an electronic controller configured to: receive a sensor signal from the sensor indicative of an operating voltage of the battery pack, determine whether the operating voltage of the battery pack is greater than a threshold, in response to determining that the operating voltage of the battery pack is greater than the threshold, generate a first control signal for driving the electric motor according to a first operating parameter, and, in response to determining that the operating voltage of the battery pack is not greater than the threshold, generate a second control signal for driving the electric motor according to a second operating parameter, the second operating parameter being less than the first operating parameter.