Hydraulic Steering Device Actuation Current Feedback
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Solution Overview
Problem
Hydraulic steering devices often experience residual control deviations and faulty actuation signals due to unforeseen factors, leading to unintended vehicle lane deviations, which existing control techniques cannot fully correct, compromising safety.
Innovation Solution
A hydraulic steering device with a secondary flow connection and independently actuable valves, equipped with means to measure and compare actuation currents, and a shut-off valve that deactivates the secondary flow connection if deviations are detected, ensuring safe operation even with faulty signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control techniques are used to compensate for wrong valve adjustments, then position deviations can be largely corrected, but residual control deviations remain that cannot be automatically eliminated
Solution Approach 1:
The patent implements a feedback mechanism by measuring actual actuation currents of valves and comparing them with expected values. When deviations are detected, the system responds by shutting off the secondary flow connection, thereby eliminating residual control deviations that conventional control techniques cannot correct.
Solution Approach 2:
The patent performs preliminary verification of actuation currents before executing steering commands. By measuring and comparing currents in advance, the system prevents faulty actuation signals from causing residual control deviations, addressing the problem before it manifests in steering inaccuracies.
2Adaptability or versatility
If multiple independently actuable valves are used in the flow regulating valve arrangement, then flexible hydraulic operative connection can be achieved, but faulty actuation signals may cause wrong movements
Solution Approach 1:
The patent applies feedback by continuously monitoring actuation currents of multiple valves and comparing them against expected values. When deviations are detected in any valve, the system shuts off the secondary flow connection, preventing faulty actuation signals from causing wrong steering movements while preserving the flexibility of multiple valve control.
Solution Approach 2:
The patent implements preliminary anti-action by proactively shutting off the secondary flow connection when actuation current deviations are detected. This preventive measure counteracts potential harmful effects of faulty actuation signals before they can cause wrong valve adjustments or steering movements.
3Reliability
If actuation currents are measured and compared, then faulty actuation signals can be detected, but device complexity increases due to additional measurement and control means
Solution Approach 1:
The patent uses feedback through measurement and comparison of actuation currents to detect faulty signals. This relatively simple feedback mechanism provides high functional safety by enabling the system to identify and respond to actuation deviations without requiring complex control algorithms or additional hardware beyond basic current sensing.
Data Source
AI summary
A hydraulic steering device which hydraulically connects a steering cylinder to a supply system. The supply system is hydraulically operatively connectable to the steering cylinder via a steering assembly for the purposes of forming a main flow connection, and the supply system is furthermore hydraulically operatively connectable to the steering cylinder via a flow regulating valve arrangement, such that a secondary flow connection can be formed which bypasses the main flow connection and via which at least one first working chamber and one second working chamber of the steering cylinder can be supplied independently of one another with hydraulic fluid.