Industrial Truck Hydraulics With Dual-Pump Pressure-Flow Switching
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Solution Overview
Problem
Industrial trucks with multiple hydraulic adjustment functions face inefficiencies and noise emissions due to the inability of a single hydraulic pump to optimize performance across different functions.
Innovation Solution
A hydraulic system with two pumps, each optimized for different efficiency maxima in volume flow and operating pressure, and a control device to selectively connect components to one or both pumps based on required parameters, minimizing noise and maximizing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single hydraulic pump is used for multiple adjustment functions, then the device complexity is reduced, but the efficiency and noise emission cannot be optimized for all functions
Solution Approach 1:
The hydraulic system is segmented into multiple independent pumps (first hydraulic pump and second hydraulic pump), each optimized for specific operating ranges. This segmentation allows each pump to operate at its efficiency maximum for particular adjustment functions, resolving the contradiction between system simplicity and operational efficiency.
Solution Approach 2:
The hydraulic line system dynamically connects different pumps to different adjustment functions based on operational requirements. The system can selectively activate the first pump for high-pressure functions, the second pump for high-volume functions, or both simultaneously, enabling adaptive optimization of efficiency across varying operational conditions.
2Device complexity
If a single hydraulic pump is used for multiple adjustment functions, then the device complexity is reduced, but noise emissions increase due to suboptimal operation
Solution Approach 1:
By segmenting the hydraulic system into specialized pumps, each pump operates within its optimal noise range for specific functions. The first pump operates quietly during high-pressure operations, while the second pump operates quietly during high-volume operations, reducing overall noise emissions compared to a single pump operating suboptimally across all functions.
Solution Approach 2:
The system changes operational parameters by selecting different pumps based on required pressure and volume flow. This parameter-based selection ensures that each pump operates at its designed optimal point, minimizing noise generation from inefficient operation.
3Use of energy by moving object
If the hydraulic pump operates at high efficiency for one adjustment function, then energy efficiency is improved, but it cannot execute other adjustment functions with optimal efficiency
Solution Approach 1:
The hydraulic system achieves multi-functionality through multiple pumps, where the first hydraulic pump handles functions requiring high pressure (such as lifting), the second hydraulic pump handles functions requiring high volume flow (such as tilting), and both can operate simultaneously for functions requiring both characteristics. This universal system maintains optimal efficiency across all adjustment functions.
Solution Approach 2:
The dynamic switching capability allows the system to adapt to different functional requirements in real-time. The control system selectively activates appropriate pumps based on the specific adjustment function being performed, ensuring optimal efficiency for each function while maintaining overall system versatility.
4Use of energy by moving object
If two hydraulic pumps are used with different efficiency maxima, then efficiency and noise emission are optimized for different functions, but the device complexity increases
Solution Approach 1:
The system merges two specialized pumps into a unified hydraulic system with a common control architecture and shared hydraulic line network. This merging approach achieves the efficiency benefits of specialized pumps while maintaining reasonable system complexity through integrated design and centralized control.
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
The system optimizes hydraulic performance and reduces noise emissions by dynamically selecting the appropriate pump or combination of pumps for each adjustment function, ensuring efficient operation across varying load conditions.
Implementation Method 1
the first hydraulic pump has a first efficiency maximum at a first volume flow and a first operating pressure and the second hydraulic pump has a second efficiency maximum at a second volume flow and a second operating pressure
Implementation Method 2
The volume flow is the volume flow of the hydraulic fluid that drives the hydraulically operated component
Data Source
AI summary
An industrial truck including a hydraulic system and at least one hydraulically operated component. The hydraulic system includes a first hydraulic pump, a second hydraulic pump, and a hydraulic line system. The hydraulic line system is configured to selectively connect the hydraulically operated component either exclusively to the first hydraulic pump or exclusively to the second hydraulic pump or simultaneously to the first hydraulic pump and the second hydraulic pump. The first hydraulic pump has a first efficiency maximum at a first volume flow and a first operating pressure and the second hydraulic pump has a second efficiency maximum at a second volume flow and a second operating pressure, and one or more of the first operating pressure is greater than the second operating pressure and the first volume flow is smaller than the second volume flow.