Lawn Mower Battery Docking and Priority Charging Control
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Solution Overview
Problem
Existing lawn mowers face challenges in efficiently managing battery charging priorities, providing user alerts for operable states, and controlling maneuvering sensitivity, which affect their operational efficiency and safety.
Innovation Solution
The lawn mower incorporates a battery compartment with gravity-biased connections for battery packs, a priority charging system, a live-to-drive alert mechanism, and a variable speed control system to manage battery charging, ensure operational readiness, and adjust maneuvering sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery packs are used to provide sufficient power, then power output is improved, but battery management complexity increases
Solution Approach 1:
The battery system is divided into multiple individual battery packs, each with its own controller that independently monitors and manages its specific pack. This segmentation allows the system to scale power output by adding more packs while keeping each control unit relatively simple, as each controller only needs to manage one pack rather than the entire battery system.
Solution Approach 2:
The battery management system employs a universal communication protocol and standardized interface that works across all battery packs. The main controller can manage any number of battery packs through this standardized interface, making the system scalable without increasing complexity proportionally. Each battery pack controller performs multiple functions including voltage monitoring, current measurement, temperature sensing, and communication.
2Ease of operation
If gravity-biased connection is used for battery packs, then ease of installation is improved, but connection reliability may worsen
Solution Approach 1:
The battery packs are designed with alignment features and guide rails that automatically position the electrical contacts correctly before engagement. This preliminary alignment action ensures that when the battery pack is installed using gravity-biased connection, the electrical contacts are already properly positioned, eliminating the need for manual alignment and ensuring reliable connection without complicating the installation process.
Solution Approach 2:
The system employs an intermediary engagement mechanism that includes spring-loaded contacts and flexible connection elements. These intermediaries accommodate minor misalignments and ensure consistent electrical contact pressure, maintaining connection reliability while allowing the simple gravity-biased installation method.
3Productivity
If priority charging system is implemented, then charging efficiency is improved, but control system complexity increases
Solution Approach 1:
The priority charging system uses feedback from battery state-of-charge sensors to dynamically adjust charging allocation. The controller continuously monitors the charge levels of all battery packs and automatically directs charging current to priority packs first, then to non-priority packs. This feedback-based automatic control achieves efficient priority charging without requiring complex manual intervention or sophisticated control algorithms.
4Reliability
If live-to-drive alert system is added, then operational safety is improved, but device complexity increases
Solution Approach 1:
The live-to-drive alert system is integrated into the existing battery management controller, which already monitors battery state-of-charge and system readiness. The same controller that manages battery charging also generates and manages the alert system, eliminating the need for separate dedicated hardware and reducing overall system complexity while maintaining operational safety.
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 solution enhances battery charging efficiency, ensures safe and reliable operation by alerting users when the mower is ready to drive, and allows for variable speed control, improving overall performance and user experience.
Implementation Method 1
a battery pack connected to the docking station through a gravity-biased connection, the battery pack providing electrical power
Data Source
AI summary
A battery-powered electric lawn mower includes battery packs mounted on a docking stations of a bus bar by way of a gravity-biased engagement. The lawn mower also includes a priority charging control logic for giving priority of charge to battery packs that have a state of charge over a threshold. The lawn mower also includes a live to drive system which alerts the user when the lawn mower is capable of moving in response to manipulation of controls. The lawn mower also includes a variable speed control which adjusts a sensitivity of speed controls such that more precise, slower speed control of the lawn mower is achieved when mowing around trees and the like.