Battery-Responsive Motor Control for Electric Working Machines
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Solution Overview
Problem
Electric working machines experience inconsistent operation due to variations in battery pack internal resistance, leading to issues like delayed start-up or excessive current flow, depending on the combination of the machine and battery pack.
Innovation Solution
An electric working machine with a controller that acquires internal resistance information from the battery pack and adjusts motor control parameters, such as startup parameters and current limits, to ensure appropriate operation regardless of the battery pack's internal resistance value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If motor control is adapted for battery packs with small internal resistance values, then motor startup is improved, but excessive current flows when battery packs with large internal resistance values are used
Solution Approach 1:
The patent implements dynamic motor control by adjusting control parameters based on the detected internal resistance value of the battery pack. The controller modifies motor control parameters in real-time according to the battery's internal resistance characteristics, enabling the system to adapt to different battery conditions and avoid excessive current flow while maintaining efficient startup performance.
Solution Approach 2:
The patent changes motor control parameters based on the internal resistance information of the battery pack. By detecting the internal resistance value and adjusting control parameters accordingly, the system optimizes motor startup characteristics for each specific battery pack, preventing both delayed startup and excessive current flow.
2Object-affected harmful factors
If motor control is adapted for battery packs with large internal resistance values, then current flow is controlled, but motor startup is delayed when battery packs with small internal resistance values are used
Solution Approach 1:
The controller dynamically adjusts motor control parameters based on the detected internal resistance value of the battery pack. When a battery pack with small internal resistance is detected, the controller modifies parameters to enable faster startup, while still maintaining current flow control through the adaptive control mechanism.
Solution Approach 2:
The patent changes motor control parameters according to the internal resistance information. By detecting the internal resistance value and adjusting control parameters accordingly, the system achieves both current flow control and optimized startup time for each specific battery pack condition.
3Device complexity
If fixed motor control parameters are used, then device complexity is reduced, but operation consistency deteriorates across different battery pack combinations
Solution Approach 1:
The system performs self-adjustment by automatically detecting the battery pack's internal resistance value and autonomously modifying motor control parameters accordingly. This self-service mechanism eliminates the need for manual parameter configuration while ensuring consistent operation across different battery pack combinations.
Solution Approach 2:
The patent implements feedback control by detecting the internal resistance value of the battery pack and using this information to adjust motor control parameters. The controller continuously monitors battery characteristics and modifies control parameters in response, ensuring consistent and reliable operation across different battery pack combinations.
Data Source
AI summary
An electric working machine in one aspect of the present disclosure includes a motor and a controller. The motor is configured to be electrically coupled to a battery pack and to be driven with electric power from the battery pack. The controller is configured to acquire an internal resistance information of the battery pack and to change control of the motor based on the internal resistance information acquired.