Isolation Switch Self-Test During Vehicle Suspension Shutdown

The patent applies preliminary action by testing the isolation switch during vehicle shutdown sequences, before the vehicle is fully powered down. The control system sends a test signal to open the isolation switch during the shutdown transition period, allowing verification of switch functionality without affecting active vehicle operation. This resolves the contradiction by performing the test in advance of complete system shutdown, ensuring safety while maintaining operational integrity.

The patent applies dynamics by making the testing frequency and timing adaptive based on vehicle operational state. The control system dynamically determines when to perform isolation switch tests based on shutdown indicators and operational conditions, rather than using a fixed testing schedule. This allows fault diagnosis capability to be maintained while adapting test execution to minimize interference with vehicle performance and avoid damaging subcomponents during critical operational phases.

The patent applies periodic action by implementing scheduled isolation switch tests during defined shutdown sequences rather than continuous monitoring. The control system uses a timer mechanism to trigger tests at appropriate intervals during vehicle shutdown, and incorporates a false alarm counter that tracks suspicious but non-critical events. This periodic approach maintains system monitoring accuracy while reducing false alarms and conserving computational resources by not continuously evaluating switch state.