Hydraulic Steering Dynamic Pressure Source Response
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Solution Overview
Problem
The existing hydraulic steering arrangements with static steering units experience delayed response due to the delayed pressure demand signaling from the adjustable pressure source, leading to delayed steering of the vehicle wheels.
Innovation Solution
Incorporating a dynamic pressure source with a control valve in the load sensing line, actuated by control pressure within the steering unit, to throttle the flow and increase pressure demand quickly, allowing for a faster reaction time of the steering unit by using a dynamic pressure source in combination with a static steering unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a static steering unit is connected to an adjustable pressure source, then energy is saved by lowering pressure when not needed, but the steering response is delayed due to delayed pressure demand signaling
Solution Approach 1:
The patent applies dynamics by replacing the static pressure signaling mechanism with a dynamic pressure source that actively adjusts output pressure based on real-time steering demands. The dynamic pressure source with load sensing capability continuously monitors steering unit requirements and adjusts pressure output without delay, eliminating the time loss associated with static pressure signaling while maintaining energy efficiency through demand-based pressure adjustment.
Solution Approach 2:
The patent implements feedback through a load sensing line that connects the load sensing port of the dynamic pressure source to the steering unit. This feedback mechanism allows the system to detect steering pressure demands and transmit this information back to the pressure source, enabling rapid pressure adjustment. The feedback loop ensures that pressure is increased only when and where needed, resolving the contradiction between energy savings and response time.
2Loss of time
If the pressure source increases pressure quickly to reduce steering delay, then steering response time improves, but energy consumption increases due to continuous high pressure
Solution Approach 1:
The dynamic pressure source continuously adjusts pressure output based on real-time steering demands detected through the load sensing line. Instead of maintaining continuous high pressure, the system dynamically modulates pressure levels, increasing pressure only when steering input is detected and reducing pressure when steering is complete. This dynamic adjustment resolves the contradiction by providing fast response when needed while minimizing energy consumption during normal operation.
Solution Approach 2:
The patent changes the pressure parameter dynamically based on steering requirements. The load sensing mechanism detects steering wheel input and triggers pressure parameter changes in the dynamic pressure source. The system transitions between low-pressure (energy-saving) and high-pressure (steering-active) states, optimizing the balance between response time and energy consumption through parameter modulation rather than static pressure maintenance.
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 combination enables the static steering unit to react with significantly reduced delay, ensuring a quicker response to steering wheel actuation by rapidly increasing output pressure, thus improving the reaction time of the steering system.
Implementation Method 1
said control valve being actuated by a control pressure within said steering unit and throttling a flow through said load sensing line depending on said control pressure
Implementation Method 2
the pressure at the load sensing port of the pressure source increases and the pressure of the pressure source increases as well. This increase of the output pressure can occur rather fast
Data Source
AI summary
A hydraulic steering arrangement (1) is provided comprising a static steering unit (2) and an adjustable pressure source (3) connected to a pressure port (4) of said steering unit (2) and having a load sensing port (21). Such a steering unit should enable a fast reaction of the steering unit. To this end said pressure source (3) is a dynamic pressure source having an orifice (Adyn) outputting hydraulic fluid to said load sensing port (21), a load sensing line (22) connecting said load sensing port (21) and a low pressure port (11), a control valve (24) being arranged in said load sensing line (22) between said load sensing port (21) and said low pressure port (11), said control valve (24) being actuated by a control pressure within said steering unit (2) and throttling a flow through said load sensing line (22) depending on said control pressure.