Hydraulic Axle Height Adjustment via Electronic Pump Control
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Solution Overview
Problem
Existing hydraulic axle height adjustment systems for mobile work machines require complex valve and hose arrangements, as well as load pressure sensors, increasing device-technical effort and complexity.
Innovation Solution
An electronically controlled hydraulic arrangement featuring a pressure-controlled adjusting pump and electronic control unit that adjusts pump pressure based on a lift signal, eliminating the need for LS switching valves and load pressure sensors, and allowing for independent control of axle height on each side of the machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a load sensing system with LS switching valve and pressure relief valve is used for hydraulic axle height adjustment, then the axle height can be adjusted, but the device complexity increases due to multiple valves and hoses
Solution Approach 1:
The patent removes the LS switching valve and pressure relief valve from the hydraulic system. The electronic control unit directly controls the adjusting pump to provide the necessary pressure for axle height adjustment, eliminating the need for complex valve arrangements while maintaining the adjustment function.
Solution Approach 2:
The patent replaces the mechanical valve-based load sensing system with an electronic control system. The electronic control unit receives signals and directly controls the adjusting pump, substituting mechanical components with electronic control to reduce device complexity.
2Measurement precision
If an LS switching valve and load pressure sensor are installed for hydraulic axle height adjustment, then precise pressure control is achieved, but the device-technical effort and cost increase
Solution Approach 1:
The patent removes the load pressure sensor and LS switching valve from the system. The electronic control unit directly controls the adjusting pump based on operational requirements, eliminating the need for separate pressure detection components while maintaining control functionality.
Solution Approach 2:
The electronic control unit performs multiple functions: it controls the adjusting pump pressure, monitors system operation, and manages axle height adjustment without requiring separate dedicated sensors and valves for each function.
3Device complexity
If a centralized hydraulic system with single lift control is used, then the system is simple, but it cannot provide differential side support for uneven terrain
Solution Approach 1:
The patent divides the hydraulic control system into independent left and right sides, with separate control inputs for each side. This allows differential adjustment of axle height on each side while using a shared adjusting pump, enabling adaptation to uneven terrain without excessive complexity.
Solution Approach 2:
The patent implements dynamic control capability where the electronic control unit can independently adjust the pressure distribution to left and right lifting cylinders based on real-time operational requirements and terrain conditions, providing adaptive differential support.
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
Simplifies the hydraulic system by reducing the number of valves and hoses, enabling efficient and precise axle height adjustment without the need for load pressure detection sensors, while allowing for differential side support and integration with other hydraulic consumers.
Implementation Method 1
the adjusting pump is set via the control unit to a pump pressure greater than the load pressure. Thus, the pressure chamber effective in lift direction is safely filled, and the axle height adjustment of the mobile work machine takes place
Data Source
Figure 1
AI summary
The invention relates to a hydraulic axle height adjustment, especially in combination with a hydraulic suspension for a mobile working machine. An electronically pressure-regulated variable displacement pump is set to a pump pressure by an electronic control unit when the mobile working machine is lifted, said pump pressure being superior to the load pressure of the weight of the mobile working machine, so that the mobile working machine is lifted in a safe manner.