Hydraulic Pump Circulation for Return Filter Cleaning in Electric Trucks
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Solution Overview
Problem
Existing hydraulic systems in industrial trucks face challenges with high pressure filter installations on the pressure side, leading to pressure losses and increased costs, while low pressure filters at the hydraulic reservoir are insufficient for effective cleaning, and there is a need for efficient energy management in electrically driven trucks.
Innovation Solution
Implementing a method where the hydraulic pump in an electrically powered industrial truck activates for circulation through a return filter during periods of no hydraulic activity, accumulating a predetermined time to ensure sufficient filtration and using sensors to determine the quality of the hydraulic liquid, allowing for automatic termination of cleaning when purity is reached, thus optimizing energy usage and reducing unnecessary cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a high pressure filter is installed on the pressure side of the pump, then cleaning efficiency is improved, but pressure losses increase and costs increase
Solution Approach 1:
Instead of filtering on the pressure side (upstream), the patent filters on the return line (downstream) after hydraulic activity. This inversion allows effective filtering without exposing the filter to high pressure conditions, avoiding pressure losses while maintaining cleaning efficiency.
Solution Approach 2:
The patent introduces a circulation pump as an intermediary device that creates a separate circulation loop. This mediator allows the hydraulic liquid to be filtered during idle periods without affecting the main hydraulic system's pressure and performance during active operation.
2Manufacturing precision
If a high pressure filter is installed on the pressure side of the pump, then cleaning efficiency is improved, but device complexity and costs increase
Solution Approach 1:
The patent merges the filtration function into the existing return line of the hydraulic system. By utilizing the existing return pipe and filter housing, the system achieves enhanced cleaning without adding separate high-pressure filtration components, thereby reducing overall device complexity.
Solution Approach 2:
The return line filter serves dual purposes: it filters particles during normal hydraulic operation and also handles circulation filtration during idle periods. This multi-functionality eliminates the need for separate high-pressure and low-pressure filters, simplifying the hydraulic circuit.
3Manufacturing precision
If continuous circulation without hydraulic activity is performed, then cleaning efficiency is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous circulation, the patent implements periodic circulation during idle periods when no hydraulic activity is detected. This approach maintains cleaning efficiency by filtering during non-productive times while minimizing energy consumption by avoiding unnecessary circulation during active operation.
Solution Approach 2:
The system uses the idle periods naturally occurring in operation to perform self-cleaning. The circulation pump activates automatically during these idle periods, allowing the system to clean itself without requiring dedicated energy input during productive work periods.
4Manufacturing precision
If continuous circulation is performed, then cleaning efficiency is improved, but noise disturbances increase
Solution Approach 1:
The patent implements circulation only during idle periods when no hydraulic activity is present. This periodic operation during non-critical times achieves necessary cleaning while minimizing noise disturbances during periods when the truck is in use and noise would be more problematic.
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
This approach enhances the cleaning efficiency of hydraulic liquid through the return filter, conserves energy, and allows for precise control of the cleaning process, maintaining hydraulic liquid quality without operator intervention, while minimizing energy consumption and noise disturbances.
Implementation Method 1
a return pipe to the hydraulic reservoir with a return filter, wherein the method comprises the steps: a. the hydraulic pump activates for hydraulic activity b. the hydraulic pump pumps the hydraulic liquid for the hydraulic activity and in relation to this a return flow occurs through the return filter to the hydraulic reservoir
Data Source
AI summary
Method for cleaning hydraulic liquid in a industrial truck, wherein said industrial truck is an electrically powered industrial truck having a battery as an energy source with a hydraulic system comprising, a hydraulic pump, a hydraulic reservoir, and a return pipe to the hydraulic reservoir with a return filter, wherein the method comprises the steps of, the hydraulic pump is activated for hydraulic activity, the hydraulic pump pumps the liquid for the hydraulic activity and in relation to this return flow through the return filter to the hydraulic reservoir occurs, the hydraulic pump can be activated by means comprised in the industrial truck, when hydraulic activity is not present, by that achieving a circulation to the hydraulic reservoir through the return filter such that sufficient filtration of the hydraulic liquid is reached, further a time Tb for circulation without hydraulic activity can be accumulated and/or a sensor for determining the quality of the hydraulic oil can be arranged in the industrial truck. Termination of the circulation is based on Tb and/or the measured quality. The application also relates to a computer program product, a control unit and an industrial truck that can perform the method.