Hydraulic Priority Valve Control for Repeatable Machine Trajectories
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Solution Overview
Problem
Construction machines with hydraulic systems face challenges in reproducing precise recurring working processes under manual control, leading to deviations and unsatisfactory results.
Innovation Solution
The integration of an electrically actuatable priority valve as a proportional valve in the hydraulic control system, connected to an electronic control unit, allows for controlled hydraulic resistance adjustments and precise trajectory following by prioritizing hydraulic drives based on load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual control of hydraulic drives is used, then ease of operation is maintained, but manufacturing precision deteriorates due to inability to reproduce recurring working processes with precision
Solution Approach 1:
The control unit stores trajectories of recurring working processes and reproduces them automatically. The system creates a digital copy of the desired motion path and executes it precisely without manual intervention, eliminating deviations that occur with manual control while maintaining ease of operation through the storage and replay functionality.
Solution Approach 2:
The patent replaces manual mechanical control with an electronic control system that uses sensors, control units, and electronic actuators. The mechanical joystick input is supplemented by electronic trajectory execution, substituting the imprecise manual mechanical control with an electronic system capable of precise reproduction of working processes.
2Manufacturing precision
If priority valve controls hydraulic flow based on load, then manufacturing precision improves through accurate trajectory following, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The control unit serves multiple functions: it stores trajectories, processes sensor data, calculates priority levels for different hydraulic drives, and controls priority valves. By consolidating these functions into a single electronic control unit, the system achieves precise trajectory following without proportionally increasing overall device complexity, as the control unit replaces multiple separate control mechanisms.
Solution Approach 2:
The priority valve acts as an intermediary between the control unit and the hydraulic drives. It translates electronic control signals into appropriate hydraulic resistance adjustments, mediating between the digital trajectory specifications and the mechanical hydraulic system. This intermediary simplifies the control architecture by providing a clear interface between electronic and hydraulic domains.
3Productivity
If hydraulic resistance is adjusted dynamically, then productivity improves through optimized drive coordination, but loss of energy increases due to additional hydraulic resistance generation
Solution Approach 1:
The priority valves dynamically adjust hydraulic resistance based on real-time sensor feedback and trajectory requirements. The system continuously monitors the positions of movable components and adjusts resistance levels to optimize drive coordination throughout the working process. This dynamic adjustment ensures that energy is expended efficiently, with resistance applied only when and where needed to maintain precise trajectory following.
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 enables precise control of hydraulic drives, ensuring accurate execution of stored trajectories, even under varying loads, thereby improving the consistency and quality of working processes in construction machines.
Implementation Method 1
each priority valve can be controlled to generate additional hydraulic resistance, wherein in the control unit... the stored trajectory is run by corresponding control of the drives
Data Source
AI summary
A construction machine with a hydraulic system has a hydraulic control, which comprises a joystick, a hydraulic pressure source, and two hydraulic drives. Main control valves are controlled by a joystick. The construction machine comprises multiple components, and a hydraulic drive is assigned for moving these components.The hydraulic control comprises an electrically-actuatable priority proportional valve in the hydraulic connection of a drive. The priority valve is electrically connected to the electronic control unit and generates additional hydraulic resistance. The hydraulic control comprises sensors, on the components, for detection of the positions thereof. The detected sensor values are transferred to the control unit. At least one trajectory is stored in the control unit. A control mode can be activated, in which each priority valve is controlled using the current sensor values upon actuation of the joystick so that the stored trajectory is run by control of the drives.