Support Leg Pulse Control for Stable Vehicle Lift-Out
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Solution Overview
Problem
Existing hydraulic systems for changing the vertical lifted-out state of carrier vehicles are complex, prone to faults, and require frequent maintenance due to the use of pressure compensators and additional valves.
Innovation Solution
A method that uses a support system with adjustable supporting legs and a controller to calculate and execute a sequence of control commands for the actuation of individual drives, allowing for a sequential and time-limited change in the vertical lifted-out state while maintaining the current inclination within a predefined range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure compensators and additional valves are used to control volume flows for hydraulic drives, then the vertical lifted-out state can be changed in a controlled manner, but the device complexity increases and susceptibility to faults rises
Solution Approach 1:
The patent removes pressure compensators and additional control valves from the hydraulic system. Instead of using complex hydraulic control elements, the invention actuates the hydraulic drives directly or with minimal control, extracting the problematic components that caused high device complexity and fault susceptibility while maintaining the ability to change the vertical lifted-out state in a controlled manner.
2Reliability
If pressure compensators and additional valves are used to control volume flows for hydraulic drives, then the vertical lifted-out state can be changed in a controlled manner, but maintenance requirements increase
Solution Approach 1:
By removing pressure compensators and additional valves from the hydraulic system, the patent reduces the number of components that require maintenance. The simplified hydraulic circuit with fewer control elements directly achieves the controlled changing of vertical lifted-out state without the maintenance burden of complex hydraulic control devices.
3Stability of the object's composition
If supporting legs are actuated simultaneously with the same volume flow, then the supporting legs can be retracted and extended synchronously, but the device complexity and fault susceptibility increase
Solution Approach 1:
Instead of using continuous hydraulic pressure compensators to maintain synchronous operation, the patent employs periodic or sequential actuation of the hydraulic drives. The control system activates each hydraulic drive in a coordinated sequence, achieving synchronous retraction and extension of supporting legs through time-based control rather than complex continuous hydraulic regulation.
Data Source
AI summary
A method for changing a vertical lifted-out state of a carrier vehicle parked on a ground surface, for a lifting device having a supporting system with support legs and a controller for controlling drives of the support legs. The method including calculating a sequence of control commands for sequential and time-limited control of the drives for changing the vertical lifted-out state while maintaining the instantaneous inclination of the carrier vehicle and/or the lifting device within a predetermined range for an inclination deviation. A lift-out step includes control of the drives of the support legs of the supporting system with the sequence of control commands for changing the vertical lifted-out state of the carrier vehicle and/or the lifting device relative to the ground surface. A sequential and time-limited control of the drives of the support legs of the supporting system with control pulses occurs with the sequence of control commands.