Mobile Working Machine Brake Control for Drive Fault Detection
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Solution Overview
Problem
Mobile working machines, such as those used in timber harvesting on slopes, face challenges in controlling the machine when a component fails due to increased loading and rapid fault development, making it difficult for operators to apply brakes effectively.
Innovation Solution
A control system that monitors the pressure level of hydraulic pumps or power feedable to electric drive motors, and compares these values with threshold levels to detect faults. If a fault is detected, the braking system is automatically activated, including the parking brake and working brakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic brake control system is implemented, then reliability of fault situation handling is improved, but device complexity increases
Solution Approach 1:
The control system continuously monitors pump pressure and motor rotation speed before faults occur, maintaining readiness to detect anomalies. Threshold values are pre-set for pressure and rotation speed parameters, enabling immediate detection when deviations occur, thus improving reliability without requiring complex real-time analysis algorithms
Solution Approach 2:
The system establishes feedback loops by continuously comparing monitored parameters (pump pressure, motor rotation speed) against threshold values. When parameters deviate from thresholds, the system automatically triggers brake activation. This closed-loop feedback mechanism ensures reliable fault detection and response while maintaining relatively simple system architecture through straightforward comparison logic
2Ease of operation
If manual brake application is required, then ease of operation is improved, but response time in fault situations worsens
Solution Approach 1:
The control system performs self-service by automatically detecting fault conditions through monitored parameters and autonomously activating the brake without requiring operator intervention. The system monitors itself and takes corrective action, eliminating the time delay associated with manual brake application while keeping the brake control mechanism simple and reliable
3Measurement precision
If monitoring parameters are increased, then detection precision is improved, but device complexity increases
Solution Approach 1:
The system monitors two key parameters (pump pressure and motor rotation speed) that are sufficient to detect the majority of fault conditions. Rather than monitoring all possible parameters, the system focuses on these critical measurements with pre-set threshold values, achieving adequate detection precision while avoiding the complexity of comprehensive multi-parameter monitoring systems
Data Source
AI summary
In the solution put forth, a pressure level of a pump in a hydraulic transmission system of a hydraulic working machine, or power that is feedable to an electric drive motor of an electric working machine is monitored, and/or the rotation speed at the output of the drive motor of the working machine and the rotation of moving means of the working machine are monitored. The pressure level of the hydraulic power transmission pump, or the power feedable to an electric drive motor, is compared with a lower threshold value to detect a fault situation, and/or the rotation speed at the output of the drive motor is compared with the rotation of the moving means also to detect a fault situation. In case a fault situation is detected, the braking system of the working machine is controlled to apply the brakes.