Battery-Powered Dolly Overload Control on Slopes
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Solution Overview
Problem
Existing dollies driven by motors continue to accelerate when overloaded while climbing slopes due to insufficient braking, leading to potential damage and impaired usability during tasks other than slope climbing.
Innovation Solution
A battery-powered dolly equipped with a detector to measure battery current and voltage values, along with a rotation information acquirer, controls motor power supply based on these readings to prevent overloading, especially when climbing slopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor is stopped when detecting overload based on battery current/voltage alone, then the motor is protected from damage, but the motor stops unnecessarily during tasks other than slope climbing, reducing usability
Solution Approach 1:
The control method dynamically adjusts the overload detection criteria based on the operational state of the dolly. When the dolly is on a slope (detected by wheel rotation characteristics), the system permits continuous operation under high current/voltage conditions. When on flat ground, the system applies stricter overload thresholds. This dynamic adaptation resolves the contradiction by making the protection mechanism context-aware, preventing false stops during normal tasks while maintaining motor protection during actual overload conditions on slopes.
Solution Approach 2:
The invention changes the detection parameters from fixed current/voltage thresholds to a combination of current/voltage values paired with wheel rotation state information. By incorporating rotation information as an additional parameter, the system can distinguish between legitimate high-power operations (slope climbing with continuous wheel rotation) and actual overload conditions, thereby maintaining motor protection without sacrificing usability during normal operations.
2Ease of operation
If the motor continues to run when overloaded on a slope, then usability is maintained, but the motor may be damaged due to insufficient braking force and continuous acceleration
Solution Approach 1:
The system implements feedback control by continuously monitoring both battery current/voltage values and wheel rotation information, then adjusting motor operation accordingly. The feedback loop distinguishes between safe high-power operation (where wheels continue rotating under load) and dangerous overload conditions (where the dolly cannot maintain position). This feedback mechanism enables the system to maintain usability during legitimate slope operations while automatically protecting the motor when actual overload occurs.
Solution Approach 2:
The control method performs preliminary assessment of the operational context by analyzing wheel rotation information before determining whether to stop the motor under high current/voltage conditions. By evaluating the rotation state in advance, the system can predict whether the dolly is in a safe operational state (continuous rotation indicating slope climbing) or a dangerous state (insufficient rotation indicating potential overload), enabling proactive motor protection before damage occurs.
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
Effectively stops the motor when the dolly is overloaded on slopes without interfering with other tasks, protecting the motor and ensuring usability.
Implementation Method 1
a detector configured to detect a battery current value and/or a battery voltage value. The battery current value corresponds to a magnitude of an electric current flowing from the battery. The battery voltage value corresponds to a magnitude of an output voltage of the battery.
Implementation Method 2
a motor configured to receive an electric power from the battery connected to the connector and rotate
Data Source
AI summary
A battery-powered dolly in one aspect of the present disclosure includes a handle, a connector, a motor, a wheel, a detector, a rotation information acquirer and a controller. The controller stops supplying an electric power from a battery to the motor based on (i) a battery current value and/or a battery voltage value detected by the detector and (ii) a rotation information acquired by the rotation information acquirer.