Hydraulic Pump Service Life Estimation Under Variable Operating Loads
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Solution Overview
Problem
The service life of hydraulic pumps varies significantly based on operating conditions, as manufacturers assume standard usage, leading to inaccuracies in determining remaining life.
Innovation Solution
A system that calculates the equivalent operating time of a hydraulic pump by considering actual operating time, rotation speed changes, delivery pressure changes, and temperature changes using pump control circuitry, pressure sensors, and temperature sensors, allowing for accurate recognition of remaining service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the manufacturer indicates the service life of the hydraulic pump based on predetermined standard conditions, then the service life indication is simple and easy to provide, but the remaining service life determination becomes inaccurate when operating conditions vary from the standard conditions
Solution Approach 1:
The patent transforms the fixed service life indication into a dynamic calculation by changing multiple parameters: operating time, rotation speed, delivery pressure, and temperature. The control circuitry calculates equivalent operating time by integrating these varying parameters, allowing accurate remaining service life determination under any operating conditions while maintaining simple manufacturer implementation through standardized calculation algorithms.
2Measurement precision
If the service life is calculated based on actual operating conditions including rotation speed, delivery pressure, and temperature variations, then the remaining service life determination becomes accurate, but the system complexity increases due to multiple sensors and calculations required
Solution Approach 1:
The control circuitry serves multiple functions: it monitors operating conditions, calculates equivalent operating time, determines remaining service life, and can trigger maintenance alerts. By making the control circuitry multi-functional, the patent avoids adding separate dedicated devices for each function, thereby reducing overall system complexity while achieving accurate remaining service life determination through integration of sensing, calculation, and control capabilities.
Data Source
AI summary
A service life determining system for determining a service life of a hydraulic pump driven by a prime mover includes pump control circuitry. The pump control circuitry calculates, each time a predetermined period has elapsed, an equivalent operating time of the hydraulic pump in the predetermined period based on an actual operating time of the prime mover in the predetermined period, a change in a rotation speed of the prime mover in the predetermined period, a change in a delivery pressure of the hydraulic pump in the predetermined period, and a change in a temperature of a hydraulic liquid in the predetermined period.