Hydraulic Regeneration Valve Control for Motor Overload Prevention
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Solution Overview
Problem
Existing hydraulic drive devices experience excessive loads on electric motors during energy regeneration, which can lead to inefficiencies and potential damage.
Innovation Solution
A hydraulic drive device that includes a hydraulic pump motor, electric motor, directional control valve, regeneration valve, and control device, where the opening degree of the regeneration valve is controlled based on inflow pressure to manage pressure loss and reduce excessive loads on the electric motor during energy regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the regeneration valve is fully opened to enable energy regeneration, then energy recovery efficiency is improved, but excessive load acts on the electric motor during regeneration
Solution Approach 1:
The patent applies dynamics by making the regeneration valve opening degree variable rather than fixed. The control device dynamically adjusts the opening degree of the regeneration valve based on real-time system conditions, allowing the system to optimize between energy recovery efficiency and motor load protection. This is achieved through closed-loop control that monitors hydraulic pressure and flow conditions.
Solution Approach 2:
The patent changes the parameter of valve opening degree from a fixed state to a controllable variable. By adjusting the opening degree parameter of the regeneration valve according to system conditions, the patent achieves optimal balance between energy recovery and motor load management. The control device modifies this parameter in real-time to prevent excessive load while maintaining regeneration efficiency.
2Loss of energy
If the regeneration valve opening degree is increased to reduce pressure loss, then regeneration efficiency is improved, but the electric motor experiences excessive load
Solution Approach 1:
The patent dynamically changes the opening degree parameter of the regeneration valve to optimize the balance between pressure loss and motor load. By adjusting this parameter based on real-time conditions, the system minimizes energy loss while preventing excessive motor loading.
Solution Approach 2:
The patent implements feedback control where the control device monitors system parameters and adjusts the regeneration valve opening degree accordingly. This closed-loop feedback mechanism ensures that pressure loss is minimized while keeping the electric motor load within safe operating limits.
3Reliability
If the regeneration valve is controlled to limit motor load, then motor protection is improved, but pressure loss increases reducing regeneration efficiency
Solution Approach 1:
The patent dynamically adjusts the valve opening degree parameter to achieve optimal protection of the electric motor while minimizing pressure loss. This continuous parameter adjustment allows the system to maintain motor safety without significantly compromising regeneration efficiency.
Solution Approach 2:
The patent uses dynamic control of the regeneration valve opening degree to balance motor protection and energy recovery efficiency. The control device continuously adapts the valve position to maintain optimal operating conditions, ensuring both motor reliability and minimal energy loss.
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
The solution effectively reduces excessive loads on the electric motor, maintaining high regeneration efficiency by controlling fluid flow and pressure loss, thereby preventing motor overload.
Implementation Method 1
a hydraulic pump motor that discharges the working fluid and is rotatably driven by the working fluid
Implementation Method 2
the control device controls an opening degree of the regeneration valve according to the inflow pressure of the working fluid that is measured by the pressure sensor
Data Source
AI summary
This hydraulic drive device drives a hydraulic cylinder by supplying and draining a working fluid via a head-end port and a rod-end port and includes: a hydraulic pump motor that is rotatably driven by and discharges the working fluid; an electric motor connected to the hydraulic pump motor; a directional control valve that switches the direction of the working fluid flowing between the hydraulic pump motor and the head-end port; a regeneration valve that opens and closes a regeneration passage connecting the head-end port and the rod-end port; a pressure sensor that measures inflow pressure at the hydraulic pump motor; and a control device that, when causing the regeneration valve to open the regeneration passage and causing the directional control valve to connect the head-end port and the hydraulic pump motor, controls the opening degree of the regeneration valve according to the inflow pressure of the working fluid.