Hydrostatic Drive Bypass Valve for Generator Speed Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hydrostatic drive devices for generators, particularly in rail vehicles, face complexity and expense in controlling generator speed and electrical network stability due to interactions among multiple components, leading to frequency and voltage fluctuations.
Innovation Solution
Incorporating a bypass with a proportional control valve around the constant motor, integrated with a two-way valve, and control electronics that detect generator speed to regulate speed efficiently, allowing for fast and precise control of generator speed and voltage stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control is implemented via flow rate controller with measuring orifice, then volume flow can be maintained constant despite fluctuating drive speed, but the control structure becomes complex and expensive requiring component-by-component testing and adjustment
Solution Approach 1:
The patent replaces the complex mechanical control system (flow rate controller with measuring orifice requiring component-by-component adjustment) with an electronic control system. A sensor detects the actual speed of the driven machine, and this signal is fed to an electronic controller that automatically adjusts the pump displacement to maintain constant volume flow. This electronic substitution eliminates the need for complex mechanical testing and adjustment of multiple components.
2Stability of the object's composition
If generator speed is controlled to maintain constant frequency and voltage, then electrical network stability is improved, but the control of multiple interacting components becomes extremely complex
Solution Approach 1:
The patent implements a feedback control system where a sensor continuously detects the actual speed of the driven generator, and this feedback signal is sent to an electronic controller. The controller compares the detected speed with the desired speed and automatically adjusts the pump displacement to maintain constant generator speed. This feedback mechanism ensures electrical network stability by maintaining constant frequency and voltage, while simplifying control coordination through automatic regulation rather than manual adjustment of multiple components.
3Speed
If a bypass with proportional control valve is added around the constant motor, then generator speed control response time is reduced to less than 200 ms, but the device structure becomes more complex
Solution Approach 1:
The patent segments the control function into two parts: the main flow path with the variable displacement pump for primary volume flow control, and a bypass path with a proportional control valve for fine-tuning and rapid adjustment. This segmentation allows the bypass to handle speed adjustments independently, achieving response times of less than 200 ms without requiring complete reconfiguration of the main control system. The proportional valve in the bypass can quickly modulate flow to correct speed deviations.
Solution Approach 2:
The patent introduces dynamic control capability through the proportional control valve in the bypass path. This valve can rapidly adjust its opening degree in response to speed deviations, providing dynamic compensation for load changes and drive speed fluctuations. The electronic controller dynamically modulates the proportional valve to maintain constant generator speed, achieving response times of less than 200 ms. This dynamic adjustment capability allows the system to adapt quickly to changing conditions without mechanical reconfiguration.
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 quick, efficient, and precise control of generator speed, stabilizing electrical network variables, even under fluctuating conditions, with minimal power losses and enhanced system reliability, suitable for rail vehicle on-board power supply.
Implementation Method 1
a bypass (16) with a control valve (17) for the volume flow, which is arranged around the constant motor (9)
Implementation Method 2
The internal combustion engine drives a variable displacement pump of the hydrostatic drive device via a power take-off, for example directly or via a transmission connected downstream of the internal combustion engine, in order to generate a volume flow of a working medium
Implementation Method 3
The drive of the generator is then implemented via a constant motor, which is driven by the volume flow of the working medium
Data Source
AI summary
The invention relates to a hydrostatic drive device (1) for a generator (2), comprising . - a variable displacement pump (6) for generating a volumetric flow rate of a working medium; . - a constant motor (9), which is driven by the volumetric flow rate of the working medium, for driving the generator; and . - a flow regulator (7) with an orifice plate (8) for regulating the volumetric flow rate of the variable displacement pump. The invention is characterized in that a bypass (16) with a regulating valve (17) for a volumetric flow rate flowing through the bypass is arranged around the constant motor.