RnD/EVOLV

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znetsixe 6a6c04d34b Migrate to new Gitea instance (gitea.wbd-rd.nl)

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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-04 21:07:04 +01:00

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Decision: Shared Modern PID in generalFunctions + PumpingStation Flow-Based Adoption

Date: 2026-02-23
Scope: nodes/generalFunctions/src/pid/*, nodes/pumpingStation/src/*

Context

Flow-based control in pumpingStation needed a production-grade PID with freeze/unfreeze, runtime retuning, and support for cascade/secondary-loop architecture.

Options Considered

Implement PID only inside pumpingStation.
Implement shared PID in generalFunctions and consume it from pumpingStation.
Keep current heuristic (non-PID) flow controller.

Decision

Chose option 2.

Rationale

PID behavior is cross-domain control functionality and should be reusable across EVOLV nodes.
generalFunctions already serves as shared utility/runtime infrastructure.
Reuse reduces drift and duplicated control logic.
PumpingStation can immediately adopt shared PID while preserving existing topic contracts.

Consequences

Positive:
- Single, test-covered PID implementation with modern features.
- PumpingStation flow mode becomes true closed-loop control.
- Runtime support for freeze/unfreeze and tuning updates without redeploy.
Risks:
- Behavioral differences versus prior heuristic flow control.
- Requires conservative tuning per site.

Safety / Compatibility

No existing topic names were removed.
Added optional control topics for PID runtime management.
Existing non-flowbased modes remain intact.

Rollback

Revert nodes/pumpingStation/src/specificClass.js flow-based branch to previous heuristic logic.
Keep shared PID module in generalFunctions for future use, or revert nodes/generalFunctions/src/pid/* if required.

Migration Notes

For flowbased, start with low kp/ki, verify stability in commissioning, then tune upward.
Use freezeFlowPid and setFlowPidMode during maintenance or manual takeover.

1.8 KiB Raw Blame History