Hydraulic Pump Deterioration Detection via Pressure-Speed Correlation
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Solution Overview
Problem
Existing methods for detecting performance deterioration in hydraulic pumps, such as measuring drain flow rates, are prone to measurement inaccuracies due to the slight flow rates involved, making it difficult to detect minute decreases in delivery flow rates caused by wear in sliding components.
Innovation Solution
A hydraulic pump performance deterioration detection system that uses a switching valve and pressure sensor to measure delivery pressure and rotation speed of the prime mover, allowing for the detection of performance deterioration without relying on flowmeter measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If drain flow rate is measured by a flowmeter to detect hydraulic pump performance deterioration, then detection capability is provided, but measurement precision deteriorates due to the slight flow rate being readily affected by measurement precision limitations
Solution Approach 1:
The patent introduces a switching valve as an intermediary device to block the drain passage, creating a closed system. This allows the use of pressure sensor measurements and prime mover rotation speed data as mediators to indirectly detect pump performance deterioration, avoiding the need to directly measure the slight drain flow rate with a flowmeter.
Solution Approach 2:
The patent replaces the mechanical flow measurement system (flowmeter) with a pressure-based detection system. By measuring delivery pressure with a pressure sensor and correlating it with prime mover rotation speed, the system substitutes direct flow measurement with pressure-based indirect detection, which provides superior measurement precision for detecting minute performance changes.
2Reliability
If a flowmeter is used to measure drain flow rate, then performance deterioration detection is enabled, but device complexity increases due to additional measurement equipment
Solution Approach 1:
The patent makes the switching valve multi-functional by using it both for its original drainage control purpose and for performance deterioration detection. By blocking the drain passage during detection, the valve enables the use of existing pressure sensors and rotation speed sensors for pump health monitoring, eliminating the need for separate detection equipment.
Solution Approach 2:
The system uses its own existing components (pressure sensor, rotation speed sensor, switching valve) to perform self-diagnosis. The hydraulic pump system monitors its own performance deterioration by utilizing data from sensors already present in the system, rather than requiring external specialized measurement devices.
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
Enables precise detection of hydraulic pump performance deterioration, improving accuracy over traditional methods by utilizing the relationship between prime mover rotation speed and hydraulic pump delivery pressure.
Implementation Method 1
a pressure sensor that measures a delivery pressure of the hydraulic pump at a position upstream of the switching valve
Data Source
AI summary
A hydraulic pump performance deterioration detection system according to one embodiment includes: a hydraulic pump that is driven by a prime mover and that supplies a hydraulic liquid to a hydraulic actuator to move the hydraulic actuator; a switching valve located on a passage through which the hydraulic liquid delivered from the hydraulic pump flows, the switching valve being switchable between an open position and a closed position; and control circuitry configured to change a rotation speed of the prime mover. When the hydraulic actuator is not moving, in a state where the switching valve is switched to the closed position, the control circuitry determines whether or not performance of the hydraulic pump has deteriorated based on the rotation speed of the prime mover and a delivery pressure of the hydraulic pump measured by a pressure sensor.