Percussion Unit Load Estimation for Mode Transition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing percussion mechanism units for rotary and percussion hammers lack effective control over operating states and load estimation, leading to inefficiencies and unreliable transitions between idling and percussion modes.
Innovation Solution
Incorporating a control unit with a load estimator and observer that uses system models to estimate unknown loads and operating parameters, allowing for precise identification of operating states and dynamic load variations, and enabling reliable mode transitions without the need for additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control unit is provided to control the pneumatic percussion mechanism, then the operating state identification and mode transition reliability are improved, but the device complexity increases due to the addition of control electronics and processing units
Solution Approach 1:
The control unit utilizes existing sensor signals (motor current, rotational speed) that are already present in the drive system to estimate load and identify operating states. The system serves itself by processing available data through evaluation rules and system models, eliminating the need for separate dedicated sensors while maintaining reliable control functionality
Solution Approach 2:
The patent replaces physical mechanical sensors and direct mechanical measurement systems with electronic control and software-based load estimation algorithms. The control unit uses electrical signals and computational models to determine operating states, substituting mechanical measurement approaches with electronic processing methods
2Measurement precision
If additional sensors are added to measure load and operating parameters directly, then the measurement precision is improved, but the device complexity and cost increase
Solution Approach 1:
The control unit acts as an intermediary that processes existing sensor signals (motor current, rotational speed) to derive load information. Rather than directly measuring load with dedicated sensors, the system uses the control unit to compute load estimates from available electrical and mechanical parameters through system models and evaluation rules
Solution Approach 2:
The patent creates a virtual model or copy of the physical system through system models that replicate the relationship between motor parameters and load. This mathematical model allows the control unit to estimate load conditions by processing electrical signals, effectively creating a digital representation of the mechanical state without physical load sensors
Data Source
AI summary
Percussion unit, especially for a rotary hammer and/or percussion hammer, comprising a control unit which is designed for controlling a pneumatic percussion mechanism. According to the disclosure, the control unit comprises at least one load estimation device.