Impact Tool Sensor Control Logic for Malfunction Prevention
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Solution Overview
Problem
Impact tools face sensor malfunctions due to heavy impacts, leading to unintended gas injection and ignition, which increases the risk of accidents and wasteful gas consumption, and existing solutions like impact damping devices increase tool size and cost.
Innovation Solution
A control unit in the impact tool nullifies sensor inputs for a predetermined period after the internal mechanism is operated, preventing sensor malfunctions without relying on mechanical structures like dampers or absorbing mechanisms, by ensuring that the sensors do not operate until a predetermined condition is met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an impact damping device or impact absorbing mechanism is added to prevent sensor malfunction, then sensor reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces the mechanical impact damping device with a control system that uses sensor output signals to control the ignition plug and gas injection device. The control unit determines whether to allow operation based on sensor signals during a predetermined period after internal mechanism operation, substituting mechanical protection with electronic control logic.
Solution Approach 2:
The control unit acts as an intermediary between the sensors and the ignition/gas injection systems. It receives sensor output signals and uses these signals to determine whether to permit operation of the ignition plug and gas injection device, thereby preventing unintended operation without requiring physical damping structures.
2Reliability
If an impact damping device or impact absorbing mechanism is added to prevent sensor malfunction, then sensor reliability is improved, but tool weight increases
Solution Approach 1:
The patent replaces the mechanical impact damping device with a control system that uses sensor output signals to control the ignition plug and gas injection device. The control unit determines whether to allow operation based on sensor signals during a predetermined period after internal mechanism operation, substituting mechanical protection with electronic control logic.
3Measurement precision
If sensors remain operational during impact periods, then measurement precision is maintained, but harmful factors increase due to unintended gas injection and ignition
Solution Approach 1:
The control unit applies preliminary anti-action by determining whether to allow operation of the ignition plug and gas injection device based on sensor output signals received during a predetermined period after the internal mechanism is operated. This preemptive control prevents harmful gas injection and ignition that would result from sensor malfunctions during impact periods.
Solution Approach 2:
The control unit uses feedback from sensor output signals to determine whether to permit operation. The sensors continuously monitor conditions and feed signals back to the control unit, which adjusts the operation state of the ignition plug and gas injection device based on these feedback signals, preventing harmful operation when sensor malfunctions are detected.
Data Source
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AI summary
An impact tool can be operated by generating an impact using an internal mechanism. The impact tool includes a control unit and sensors. The control unit controls the internal mechanism. The sensors output a signal for operating the internal mechanism or a signal for preparing the operation of the internal mechanism, to the control unit. Until a predetermined condition is established after the internal mechanism is operated, the control unit does not accept the input of the sensors.