Work Machine Battery Rescue Mode for Deep-Discharge Prevention
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Solution Overview
Problem
Existing electrical work machines face significant risks of battery deep discharge, leading to reduced service life and potential immobilization in hard-to-reach locations, as current control methods fail to adequately prevent such discharge states.
Innovation Solution
A work machine equipped with a state-of-charge evaluation device and control unit that activates various operational modes based on battery thresholds, including a backup mode accessible only with authentication, to prevent deep discharge and enable controlled movement to charging or transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the battery state of charge is monitored and operations are restricted when below a threshold, then the battery service life is protected, but the work machine may become completely immobilized in hard-to-reach locations
Solution Approach 1:
The system dynamically adjusts operational restrictions based on authenticated user profiles. Different users (operator, supervisor, manager) receive different levels of access and authorization, allowing the system to adapt between protecting the battery and enabling necessary movements based on who is operating the machine.
Solution Approach 2:
The system changes the parameter of operational authorization based on user authentication. When a higher-authorized user logs in, the state of charge threshold for allowing movements can be modified, enabling the machine to move even at lower charge levels under supervised conditions.
2Duration of action of stationary object
If strict control is applied to prevent deep discharge, then battery degradation is reduced, but operational flexibility and emergency response capability are limited
Solution Approach 1:
The system provides dynamic operational flexibility through multi-level user authentication. The operator profile allows standard protected operation, the supervisor profile enables authorized movements with warnings, and the manager profile allows forced movements even at low charge levels, thus adapting operational restrictions to the situation and user needs.
Solution Approach 2:
The user authentication system segments access rights into different levels (operator, supervisor, manager), each with progressively greater authority to override battery protection protocols. This segmentation allows the system to maintain strict protection for normal operation while enabling flexibility when higher authorization is present.
3Reliability
If multiple authentication levels are implemented, then controlled access to backup mode is enabled, but device complexity increases
Solution Approach 1:
The authentication device serves multiple functions: it identifies users, determines their authorization level, and automatically configures the appropriate operational mode. This multi-functionality reduces the need for separate systems for each function, thereby managing complexity while providing reliable controlled access.
4Duration of action of stationary object
If the work machine is restricted from moving when battery charge is low, then battery deep discharge is prevented, but the ability to relocate to charging points or transport is lost
Solution Approach 1:
The system dynamically allows relocation movements when authenticated users with appropriate authorization levels are present. The supervisor and manager profiles specifically enable movement operations even when the battery charge is below the normal threshold, allowing the machine to be relocated to charging points or transport vehicles while maintaining battery protection for normal operations.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a work machine comprising a frame, a propulsion structure, a load-handling apparatus, an electrical energy storage unit (10), a device (16) for evaluating state of charge configured to determine a value V representative of the state of charge of said electrical energy storage unit (10), and a control unit (14) that is configured to: - compare the value V to a threshold V1; - activate a mode (400) in which handling and movement operations are prohibited when the value V is lower than or equal to the threshold V1; and - activate a rescue mode (500) in which operation of the propulsion structure is permitted when an authorization signal is sent by an authentication device (17) and when the mode in which movement is prohibited is active.