Hydraulic Pressure Amplifier Control Without End-of-Stroke Sensors
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Solution Overview
Problem
Existing hydraulic pressure amplifier systems are complex, costly, and generate pressure pulses due to sudden piston movement inversions, which limits their performance.
Innovation Solution
A hydraulic pressure amplifying device with a casing containing two chambers and a staged piston, where the piston movement is controlled by electronic control means that estimate end-of-stroke without mechanical sensors, using a time base and pressure measurement to control the flow restriction, reducing the number of components and eliminating mechanical end-of-stroke detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical end-of-stroke detection valves and control slide valves are used, then the piston movement can be controlled, but the system becomes complex and costly
Solution Approach 1:
The patent replaces mechanical end-of-stroke detection valves and control slide valves with an electronic control system that uses a bi-stable valve and detection valves to detect piston position and control movement electronically, thereby reducing mechanical complexity while maintaining control functionality
Solution Approach 2:
The patent extracts and eliminates the mechanical stop components from the system by using electronic detection of end-of-stroke positions through detection valves that sense piston position without requiring mechanical contact stops
2Measurement precision
If mechanical end-of-stroke stops and detection valves are used, then the piston movement can be detected, but the cost increases
Solution Approach 1:
The detection valves serve multiple functions: they detect end-of-stroke positions and also control the feeding and discharge of chambers, eliminating the need for separate mechanical detection stops and reducing overall component count and cost
3Productivity
If sudden inversion of piston movement direction is used, then the pressure amplification cycle is completed quickly, but pressure pulses are generated
Solution Approach 1:
The patent uses periodic, controlled cycling of the bi-stable valve to alternately feed and discharge the chambers in a regulated sequence, which maintains high productivity while avoiding sudden piston inversions that generate pressure pulses
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 enhances performance by reducing complexity and cost, minimizing pressure pulses, and improving the efficiency of hydraulic pressure amplification, making it suitable for applications like vehicle braking systems.
Implementation Method 1
When a hydraulic pressure is applied in a low-pressure inlet chamber on the section with the large cross section of the piston, a higher pressure is obtained in an outlet chamber containing the section with the small cross section of the piston. The pressure ratio between the pressure applied in the inlet chamber and the pressure prevailing in the outlet chamber is equal to the ratio between the cross sections of the two piston sections.
Implementation Method 2
the means of estimating the end-of-stroke of the piston measure the pressure at the inlet of the low-pressure inlet chamber for the extension phase of the piston. the means of estimating the end-of-stroke proceed with a pressure measurement by means of a flow restriction element, for example an atomizer.
Data Source
AI summary
The present invention concerns a hydraulic pressure amplifier device comprising a casing (10) having two chambers (12, 14) of different cross-sections which house a staged piston (20) comprising two piston sections (22, 24) with cross-sections respectively el matching the chambers (12, 14), and means (30) for controlling the movement of the piston (20), characterised by the fact that the control means (30) are formed of an electronic control driven by means for estimating the ends-of-stroke of the piston (20) without an end-of-stroke sensor or mechanical stop.