Hydraulic Pump Pressure Frequency Analysis for Breaker State Detection
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Solution Overview
Problem
Existing hydraulic working machines lack a reliable method to determine if the hydraulic breaker is in an operation state, leading to potential damage to machine bodies and equipment when operating in modes other than the breaker mode, due to excessive flow rates of pressure oil.
Innovation Solution
A working machine control device equipped with a pressure sensing section and a controller that detects pump pressure frequency characteristics to determine the operation state of the hydraulic breaker, issuing alarms and adjusting flow rates to prevent damage, and optimizing maintenance timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flow rate control is not performed when breaker mode is not selected, then the hydraulic pump can operate at high capacity for general working operations, but the flow rate of pressure oil supplied to the breaker becomes excessive causing potential damage to machine body and hydraulic equipment
Solution Approach 1:
The control device performs preliminary detection of breaker operation state through pressure frequency analysis before damage can occur. By continuously monitoring the frequency characteristic of pump pressure, the system proactively identifies breaker operation and preemptively adjusts flow rate control to prevent excessive flow rate damage.
Solution Approach 2:
The system establishes a feedback loop where the control device continuously monitors pump pressure frequency characteristics, determines breaker operation state based on this feedback, and adjusts flow rate control accordingly. This closed-loop control ensures that when breaker is detected to be operating, the hydraulic pump output is automatically regulated to appropriate levels.
2Adaptability or versatility
If a mode change switch is used to select breaker mode, then different working modes can be selected, but the system cannot reliably determine whether the breaker is actually in operation state leading to inadequate protection
Solution Approach 1:
The system replaces reliance on mechanical mode switch selection with electronic/signal-based detection. Instead of trusting the mode change switch position, the control device uses pressure sensing sections to detect actual breaker operation state through frequency analysis of pump pressure, providing reliable determination independent of manual mode selection.
Solution Approach 2:
The pressure sensing section acts as an intermediary between the hydraulic system and the control device. It converts physical pressure variations caused by breaker operation into detectable frequency characteristics, enabling the control device to indirectly and reliably determine breaker operation state without direct mechanical connection or mode switch dependency.
3Measurement precision
If frequency analysis of pump pressure is used to detect breaker operation state, then accurate detection can be achieved, but the control system complexity increases
Solution Approach 1:
The control device performs multiple functions using the same pressure sensing infrastructure: it monitors pump pressure for breaker operation detection, analyzes frequency characteristics to determine operation state, and uses this information for flow rate control. This multi-functional approach achieves accurate detection without proportionally increasing system complexity.
Solution Approach 2:
The system transforms the physical parameter of pump pressure into its frequency domain representation through spectral analysis. By changing the parameter from time-domain pressure to frequency-domain characteristics, the control device can reliably identify breaker operation patterns and achieve precise detection while using standard signal processing techniques.
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
Ensures accurate determination of the hydraulic breaker's operation state, preventing damage by adjusting flow rates and optimizing maintenance schedules, and allows for precise identification of the type of working equipment.
Implementation Method 1
a pressure sensing section configured and arranged to detect the pump pressure of the hydraulic pump (16)
Implementation Method 2
The controller (45) is configured to obtain the frequency characteristic of the pump pressure based on a pump pressure value that is detected by the pressure sensing section (48)
Implementation Method 3
working equipment such as a hydraulic breaker and a hydraulic compactor that is operated by a vibration generating device that is supplied with pressure oil from a hydraulic pump and generates vibration
Data Source
AI summary
A working machine control device is provided which can surely determine whether working equipment attached to a working machine is in an operation state. The working machine control device is configured to control a vibration generating device that is supplied with pressure oil from a hydraulic pump to generate vibration to operate working equipment attached to a working machine. The working machine control device includes a controller that is configured to obtain frequency characteristic of the pump pressure based on a pump pressure value that is detected by a pressure sensing section, and to determine whether said working equipment is in an operation state or not based on said frequency characteristic.