Power Tool AUTO SENSE Control for Battery-Adaptive Speed Shifting
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Solution Overview
Problem
Power tools consume excessive energy when unloaded and struggle to adjust rotational speed effectively for cutting tasks due to sensitivity issues in the AUTO SENSE function caused by varying battery parameters.
Innovation Solution
A power tool with a control circuit that adjusts the parameter threshold based on battery parameters, user input, and running parameters to control the electric motor's rotational speed, enabling the AUTO SENSE function to adapt to different battery conditions and cutting materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the power tool runs at maximum rotational speed constantly, then the cutting tool can work at high speed after pressing hard, but the power tool consumes excessive energy when unloaded
Solution Approach 1:
The patent implements dynamic speed control by adjusting the rotational speed of the electric motor based on real-time detection of motor parameters (current, torque, power) and comparing them against dynamically adjusted thresholds. The controller transitions the motor between different operating states (low speed idle, accelerated, high speed cutting) based on load conditions, making the speed characteristic adaptive rather than fixed.
Solution Approach 2:
The patent changes the parameter threshold dynamically based on battery parameters (electric quantity, capacity) and motor running parameters. The threshold is adjusted in real-time to account for battery degradation and varying load conditions, enabling the AUTO SENSE function to accurately detect loading states across different battery conditions and maintain optimal energy efficiency.
2Device complexity
If a fixed determination threshold is used for the AUTO SENSE function, then the control logic is simple, but the sensitivity of the determination threshold reduces when battery parameters change
Solution Approach 1:
The patent dynamically adjusts the parameter threshold based on battery parameters (electric quantity, capacity) and motor running parameters. The threshold is modified in real-time to compensate for battery degradation and varying operating conditions, maintaining the sensitivity and accuracy of the AUTO SENSE function throughout the battery's lifecycle and across different load scenarios.
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously detects motor parameters (current, torque, power) and battery parameters, compares them against the dynamically adjusted threshold, and uses this information to determine loading states and adjust operating speed. This closed-loop feedback ensures reliable detection despite changes in battery characteristics.
3Ease of operation
If the electric motor rotates at high speed from startup, then cutting performance is maintained, but it is unfavorable for users to align blades
Solution Approach 1:
The patent implements dynamic speed adjustment that adapts to operational needs. During startup and blade alignment, the motor operates at low speed for ease of positioning. Once cutting is detected through parameter threshold comparison, the motor accelerates to high speed for optimal cutting performance. This dynamic adaptation resolves the contradiction between ease of operation and cutting effectiveness.
Data Source
AI summary
A power tool includes: an electric motor; a battery mounting portion adaptable to multiple types of battery packs; and a control circuit configured to control the electric motor to run. The control circuit includes at least a controller configured to, in the case where an electric motor parameter of the electric motor exceeds a parameter threshold, control the electric motor to rotate on an accelerated basis. The controller is configured to acquire a battery parameter of a battery pack and adjust the parameter threshold according to the battery parameter. With the preceding technical solution, the power tool with an AUTO SENSE determination threshold that has relatively high stability can be provided.