Adaptive Hydraulic Damping Unit for Pulsation Control
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Solution Overview
Problem
Hydraulic systems in motor vehicle brake systems face challenges in pulsation damping, leading to noise and vibration issues, particularly during varying pressure and volume flow demands, and existing solutions are not effective across different operating conditions.
Innovation Solution
An adaptive damping unit with a switchable orifice system, comprising a damping chamber and two orifices of different sizes, automatically adjusts to prevailing pulsation characteristics, allowing for extended range of action and improved noise insulation by varying the throttling effect based on pressure differentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed configuration of pulsation damping means is used, then the damping effect is sufficient at certain operating points, but the damping effectiveness deteriorates at other operating conditions
Solution Approach 1:
The damping unit incorporates a switchable orifice system with two different orifice cross-sections that can be dynamically selected based on operating conditions. The second orifice is switched in when the pressure differential across the damping chamber exceeds a threshold value, allowing the system to adapt its damping characteristics to varying pressure and flow conditions, thereby maintaining effectiveness across a wider operating range.
Solution Approach 2:
The system changes the physical parameter of the orifice cross-section based on the pressure differential condition. When the pressure differential is high, the system transitions from using the first orifice to using the second orifice with a different cross-sectional area, thereby adjusting the damping parameter to match the operating conditions and maintain optimal pulsation reduction.
2Productivity
If the pump is dimensioned for maximum volume flow delivery to cover safety-critical interventions, then the delivery capacity is sufficient for emergency control, but pulsation and noise increase during small delivery volumes
Solution Approach 1:
The switchable orifice system dynamically adjusts the damping characteristics based on the actual operating point. During small delivery volumes, the system can switch to the appropriate orifice configuration that provides optimal damping for low-flow conditions, thereby reducing pulsation and noise while maintaining the pump's maximum delivery capacity for emergency situations.
Solution Approach 2:
The damping unit automatically detects the operating conditions through the pressure differential across the damping chamber and self-adjusts by switching between orifices without external control. This self-regulating mechanism ensures optimal pulsation damping is always active, reducing harmful effects during both small and large delivery operations.
3Device complexity
If multiple pump circuits share a jointly bundled drive train, then the system structure is compact and cost-effective, but negative pressure and cavitation occur in circuits with zero delivery
Solution Approach 1:
The invention extracts the suction path from the common bundled structure and provides it with a separate controllable valve for each pump circuit. This allows independent control of the suction path for each circuit, enabling the system to prevent cavitation in zero-delivery circuits by closing their respective suction valves while maintaining the compact drive train structure.
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 adaptive damping unit effectively reduces pulsation across a wide range of operating conditions, enhancing comfort and noise insulation by coordinating the damping effect with phase shifts in pulsation frequencies, even at low drive frequencies, thus improving overall system performance.
Implementation Method 1
at least one damping unit which comprises a plurality of pulsation damping means such as a damping chamber, elastic body and orifice
Implementation Method 2
varying the throttling effect based on pressure differentials
Implementation Method 3
at least one damping unit which comprises a plurality of pulsation damping means such as a damping chamber, elastic body and orifice
Implementation Method 4
automatically adjusts to prevailing pulsation characteristics, allowing for extended range of action and improved noise insulation by varying the throttling effect based on pressure differentials
Data Source
AI summary
A hydraulic system comprising a receiving body with electrohydraulic valve, with at least one hydraulic pump, and with channels for connecting the pump to at least one hydraulic load. A pulsation situation arises as a result of the delivery of a pressure medium by the pump and/or as a result of pressure medium being withdrawn by the load. At least one damping unit is provided, having a plurality of pulsation damping means such as, in particular, a damping chamber, and orifice. The hydraulic system provides a uniform and cost-effective solution for different operating situations and prevents a decrease in comfort. The damping unit has at least one switching means for adjusting the action of said damping unit to a varied pulsation situation by connecting or disconnecting one or more damping means.