Hydraulic Pump Speed Protection via Fluidic Decoupling
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Solution Overview
Problem
Hydraulic systems in commercial vehicles face damage and high repair costs due to impermissible overspeed of fixed displacement pumps, leading to particle contamination and damage to connected functional devices, such as hydrostatic auxiliary drives.
Innovation Solution
A protection configuration that detects excessive pump speed, pressure, or flow rates and automatically decouples the functional devices from the pump using a detection unit and electronic control system, preventing damage by blocking or fluidically isolating them when safety criteria are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed displacement pump is used to convert mechanical energy into hydraulic energy, then the pump can operate at constant speed coupled to the rear axle, but the pump may impermissibly overspeed due to various malfunctions causing mechanical overload and particle contamination
Solution Approach 1:
A protection configuration is introduced as an intermediary system between the pump and functional devices. This configuration includes detection means for monitoring pump speed and a control mechanism that activates when a safety criterion (such as limit speed) is exceeded, thereby protecting functional devices from particle contamination without requiring changes to the pump itself
Solution Approach 2:
The protection configuration performs preliminary detection and protection actions before damage occurs. By continuously monitoring pump speed and activating protective measures when approaching dangerous operating conditions, the system prevents particle generation and subsequent contamination of functional devices
2Productivity
If the pump operates at high speed to maintain hydraulic function, then the hydraulic system can function properly, but damage to the pump can occur leading to high repair costs and system failure
Solution Approach 1:
The protection configuration implements a feedback mechanism where detection means continuously monitor pump operating parameters (such as speed, pressure, or flow rate) and provide information to a control system. When parameters indicate dangerous operating conditions, the control system activates protective measures, creating a closed-loop control that maintains productivity while preventing mechanical damage
3Device complexity
If no protection system is installed, then the hydraulic system structure remains simple, but functional devices are vulnerable to damage from pump failures and particle contamination
Solution Approach 1:
A protection configuration is introduced as an intermediary system between the pump and functional devices. This configuration includes detection means for monitoring pump speed and a control mechanism that activates when a safety criterion (such as limit speed) is exceeded, thereby protecting functional devices from particle contamination without requiring changes to the pump itself
Solution Approach 2:
The protection configuration is designed as a separate, modular system that can be added to existing hydraulic systems without fundamentally redesigning the entire system. The detection means and control mechanisms are segmented into distinct functional components that can be independently installed and maintained
Data Source
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AI summary
The invention relates to a hydraulic system (H) for a motor vehicle, in particular a commercial vehicle. The hydraulic system (H) comprises a pump (6) and at least one functional device (1, 3, 4, 5, 7, 8, 9, 10, 11) which is fluidically connected to the pump (6). The hydraulic system (H) is characterized in particular by a protective configuration (S) which serves to protect the functional device (1, 3, 4, 5, 7, 8, 9, 10, 11) from the effects of damage to and/or in the pump (6).