Load-Controlled Hydraulic Pump Flow for Engine Stall Prevention
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Solution Overview
Problem
Existing load-controlled hydraulic supplies for utility vehicles, such as agricultural tractors, often operate the variable-displacement pump at inefficient power characteristic ranges, leading to unnecessary high volume flow outside optimal speed ranges and potential stalling of diesel engines.
Innovation Solution
A load-controlled hydraulic supply system that incorporates an electrical actuator and control unit to adjust the volume flow of the variable-displacement pump based on load requirements and engine speed, optimizing pump operation and preventing inefficient power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the variable-displacement pump is dimensioned to provide sufficient delivery capacity under increased load conditions, then reliability is improved, but energy consumption increases and the diesel engine operates in inefficient power characteristic ranges
Solution Approach 1:
The patent applies dynamics by making the pump delivery capacity adjustable through an electronically controlled actuator that modifies the pump's operating characteristics in real-time. The control unit dynamically adapts the pump's volume-flow delivery to match actual hydraulic consumer requirements and engine operating conditions, transitioning from a static to a dynamic system that optimizes energy efficiency while maintaining reliability.
Solution Approach 2:
The patent implements parameter changes by modifying the pump's operating parameters (volume flow, delivery pressure) through electronic control based on engine speed and load conditions. The control unit adjusts pump parameters to keep the diesel engine within its efficient power characteristic range, preventing operation in inefficient zones while ensuring sufficient hydraulic supply.
2Productivity
If the variable-displacement pump is dimensioned for sufficient delivery capacity during medium speed range operation, then productivity is improved, but device complexity increases due to additional control systems
Solution Approach 1:
The patent applies universality by integrating multiple functions into the control system: the control unit not only regulates pump delivery to optimize productivity but also manages energy efficiency, prevents engine stalling, and adapts to varying operational conditions. This multi-functional approach consolidates control tasks into a single system rather than adding separate dedicated systems for each function.
Solution Approach 2:
The patent replaces traditional mechanical load-sensing control mechanisms with an electronic control system. Instead of purely mechanical actuators responding to hydraulic pressure, the system uses electronic sensors, microprocessors, and electronic actuators to control pump delivery, reducing mechanical complexity while improving control precision and adaptability.
3Adaptability or versatility
If the pump operates at high volume flow outside optimal speed ranges, then adaptability is improved, but the diesel engine may stall
Solution Approach 1:
The patent implements feedback by using sensors to monitor engine speed, pump operating conditions, and hydraulic consumer requirements in real-time. The control unit continuously receives feedback signals and adjusts pump delivery accordingly, preventing conditions that would lead to engine stalling while maintaining adaptability to varying operational demands. This closed-loop control ensures reliability during adaptive operation.
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 system achieves improved efficiency by maintaining a constant volume flow at maximum pump speed and adapting delivery to match predetermined power characteristics, thereby preventing diesel engine stalling and reducing energy consumption.
Implementation Method 1
an electrical actuator or electrical actuating means for actuating the control slide is also present
Implementation Method 2
The hydraulic system can provide hydraulic flow to various components of the utility vehicle
Implementation Method 3
the variable-displacement pump has a mechanically actuable control slide for changing a volume flow delivered
Data Source
AI summary
A load-controlled hydraulic supply for a utility vehicle includes a variable-displacement pump supplied with hydraulic fluid from a hydraulic reservoir. The variable-displacement pump has a mechanically actuable control slide for changing a volume flow delivered. An electrical actuator is configured to actuate the control slide. A controller is configured to control the electrical actuator in accordance with a determined load requirement on a consumer side.