Hydraulic Control Valve Unit for Load-Sensing Volume Adjustment
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Solution Overview
Problem
Existing systems for varying the swept volumes of hydraulic machines in transmissions are complex and demand high robustness and speed, making them difficult to implement effectively.
Innovation Solution
A device that determines the actual pressure in the hydraulic system and uses this information to actuate a control valve unit, allowing for simplified operation and elimination of the high-pressure-regulating valve unit, enabling continuous adjustment of transmission ratios and load-sensing capabilities without mechanical feedback or complex logic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a high-pressure-regulating valve unit and position-regulating valve unit are used to control hydraulic machines, then load-sensing and transmission ratio adjustment are achieved, but the control system becomes complex and requires high robustness and speed
Solution Approach 1:
The patent extracts and eliminates the high-pressure-regulating valve unit from the control system. Instead of using a complex two-valve system (position-regulating valve unit and high-pressure-regulating valve unit), the invention uses only a position-regulating valve unit that directly controls the swept volumes of the hydraulic machines based on actual pressure feedback, thereby simplifying the control system while maintaining load-sensing capability
Solution Approach 2:
The patent implements a feedback mechanism where a device for determining actual pressure provides real-time pressure information to the position-regulating valve unit. This closed-loop feedback system allows the valve unit to automatically adjust the swept volumes of the hydraulic machines based on actual pressure conditions, eliminating the need for a separate high-pressure-regulating valve unit and simplifying the overall control system
2Stability of the object's composition
If mechanical feedback mechanisms are used in the control system, then stable operation is achieved, but dynamics are limited and the system becomes more complex
Solution Approach 1:
The patent replaces mechanical feedback mechanisms with an electronic feedback system. A device for determining actual pressure provides electronic signals to the position-regulating valve unit, eliminating the need for mechanical feedback linkages. This substitution maintains system stability through electronic control while significantly improving response speed and reducing mechanical complexity
3Stress or pressure
If pressure-dependent control is implemented, then high-pressure limitation is achieved, but pressure fluctuations cause control issues and system dynamics are limited
Solution Approach 1:
The patent implements a self-service control mechanism where the position-regulating valve unit automatically adjusts the swept volumes of the hydraulic machines based on actual pressure feedback without requiring complex external control logic. The system self-regulates high-pressure conditions by reducing swept volumes when pressure exceeds thresholds, eliminating the need for complex pressure-dependent control logic and improving system dynamics
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 solution simplifies the control valve unit design, reduces hardware requirements, and enhances the system's ability to distinguish between overdrive and traction operations, ensuring robust load-sensing and high-pressure limitation across the transmission's operating range, while preventing dynamics limitations and pressure-dependent issues.
Implementation Method 1
an armature of a proportional magnet of the position-regulating valve unit is drawn into a solenoid by applying an actual current regulated by a current regulator. By virtue of the magnetic force produced, a slide of the position-regulating valve unit made as a 4/2 control valve is displaced.
Implementation Method 2
the piston can be acted upon by way of a position-regulating valve unit and a high-pressure-regulating valve unit of a valve device or control valve device, in the area of a functional surface that delimits a piston space, with pressures that correspond to a hydraulic pressure present in the area of the hydraulic machines
Data Source
AI summary
A device for varying the swept volumes of first and second hydraulic machines, whose swept volumes depends upon pivoting positions of adjustable axes thereof which can be connected to one another by first and second lines. The axes can be coupled to a piston-cylinder device which is adjustable by a control valve unit for pivoting the axes. Pressures in the area of the hydraulic machines can be limited by the control valve unit. The control valve unit can be coupled to a respective first or second line with the highest pressure. A device for determining an existing actual pressure is located upstream of the control valve unit, at least in the area of one of the first and the second lines that connects with the first and the second hydraulic machines. The control valve unit can be actuated based on the actual pressure value determined by the device.