Hydraulic Throttle Valve Control With Active Vibration Damping
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Solution Overview
Problem
Existing hydraulic control systems for fluid consumers like motors and actuators experience vibrations due to weak damping, caused by pressure compensators, which affect load independence and speed control, especially when load changes occur.
Innovation Solution
A control system that high-pass filters the oscillation frequency band, using an electronic pressure compensator and load pressure feedback to set the throttle cross-section, with a control algorithm that includes electronic deadweight testing, active vibration damping, and superimposed PI control behavior, eliminating the need for conventional pressure compensators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure compensators are used to maintain constant pressure difference across throttle valve, then load-independent speed control is achieved, but vibrations are excited in weakly damped consumers
Solution Approach 1:
The patent implements a feedback mechanism where the actual speed or position of the consumer is recorded and fed back to the control module. This feedback loop allows the control module to continuously adjust the throttle valve position to maintain the desired speed or position, thereby achieving load-independent control while actively compensating for vibrations through dynamic adjustment rather than static pressure compensation
Solution Approach 2:
The patent replaces the mechanical pressure compensator system with an electronic control system. Instead of using mechanical pressure compensators to maintain constant pressure difference, the invention uses an electronic control module with sensors and actuators to electronically regulate the throttle valve, thereby eliminating the vibration excitation caused by mechanical pressure compensators while maintaining load-independent speed control
2Reliability
If conventional pressure compensators are used for vibration damping, then load independence is maintained, but system complexity and cost increase due to additional valve technology
Solution Approach 1:
The patent merges the vibration damping function with the existing electronic speed/position control system. The same control module that regulates speed or position also handles vibration damping by processing the feedback signal and adjusting the throttle valve accordingly. This integration eliminates the need for separate vibration damping valves and reduces overall system complexity while maintaining effective vibration control
Solution Approach 2:
The control module in the patent serves multiple functions: it controls the speed or position of the consumer, records actual values via sensors, and actively damps vibrations through feedback. This multi-functional approach eliminates the need for dedicated vibration damping components, thereby reducing system complexity and cost while maintaining effective vibration 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
This solution significantly reduces vibrations, maintains load independence and speed control, and provides a faster step response without the need for additional valve technology, making the system more reliable and cost-effective.
Implementation Method 1
the oscillation frequency band is high-pass filtered in such a way that only the high filtered frequencies affect the setting of the control valve and the low frequencies pass through a dead time or delay block
Implementation Method 2
the electronic pressure compensator recording the pressure in front of and behind the control valve, seen in the direction of fluid flow
Implementation Method 3
using a flow characteristic curve determination via a fluidic resistance to set the throttle cross section in such a way that an approximately constant volume flow always flows through it
Implementation Method 4
the load pressure feedback is used for active vibration damping by filtering the load-side pressure with its vibration frequency band
Implementation Method 5
the oscillation frequency band is high-pass filtered in such a way that only the high filtered frequencies affect the setting of the control valve
Implementation Method 6
the control output of the load pressure feedback is subtracted from the control signal of the electronic pressure compensator to form the valve opening signal for the control valve
Data Source
Figure 1
AI summary
Control system, in particular for speed or position control of fluidic consumers such as hydraulic motors (10) or actuators, which are to be controlled from the fluid supply side (18) by adjusting a throttle valve, independently of the load, consisting of at least one - electronic pressure balance (30) and/or - load pressure feedback (32) and/or - speed (34) or position control device.