Hydraulic Steering Valve Redundancy With Fault Isolation
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Solution Overview
Problem
Existing hydraulic power steering systems lack sufficient operational reliability due to the lack of redundant protection for individual components within flow-regulating valve arrangements, which can lead to unsafe steering operations if one valve fails.
Innovation Solution
The system employs paired supply and discharge valves designed as proportional servo valves that can be electrically actuated and monitored by a fault detection device, allowing for the deactivation of faulty valves and ensuring that the remaining valves can take over the steering actuation, even if both faulty valves are not from the same flow-regulating valve arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant flow-regulating valve arrangements are used, then operational reliability is improved, but device complexity increases
Solution Approach 1:
The system divides the flow-regulating valve arrangements into individual controllable components (supply valves and discharge valves) that can be independently monitored and deactivated. This segmentation allows the fault detection device to identify and isolate specific faulty valves rather than entire valve arrangements, maintaining redundancy while reducing the complexity of fault isolation and system reconfiguration.
2Reliability
If individual valves are monitored and can be deactivated, then reliability is further improved, but device complexity and control complexity increase
Solution Approach 1:
The fault detection device continuously monitors the operation of supply and discharge valves by comparing actuation signals and detects deviations indicating faulty operation. This feedback mechanism enables automatic identification of faulty valves and triggers appropriate responses (deactivation or takeover by remaining valves), improving reliability through real-time monitoring without requiring complex manual intervention systems.
Data Source
AI summary
1. Hydraulic power steering system.2. A hydraulic power steering system, at least consisting of a steering actuator (10), for the actuation of which in opposite steering directions two subsystems (12; 14) are used, each in the form of flow-regulating valve arrangements (16; 18) having release valves (V3; V6), a fault detection device (30), by means of which at least one faulty component (V1, V2; V4, V5) of a respective subsystem (12; 14) can be determined and deactivated and by means of which the fault-free components (V1, V2, V3; V4, V5, V6) of at least one subsystem (12; 14) can be caused to keep up the actuation of the steering actuator (10), is characterized in that each flow-regulating valve arrangement (16; 18) has supply valves (V1; V4) and discharge valves (V2; V5), which are assigned to each other in pairs, and designed as proportional servo valves (28), which can be actuated electrically by means of actuation signals, which, compared to each other by means of the fault detection device (30), lead to deactivation of at least one valve (V1, V2, V3; V4, V5, V6) detected as faulty in the event of deviations detected as relevant.