agv routing

**AGV Routing** in semiconductor fabs involves optimizing paths for Automated Guided Vehicles that transport wafer lots between process tools. ## What Is AGV Routing? - **System**: AMHS (Automated Material Handling System) component - **Goal**: Minimize transport time while avoiding collisions - **Methods**: Shortest path, traffic-aware, predictive routing - **Scale**: 500+ AGVs in modern 300mm fabs ## Why AGV Routing Optimization Matters Inefficient routing causes tool starvation, WIP pileups, and cycle time increases. Optimized routing can improve fab throughput 5-15%. ```svg AGV Routing Challenges:┌─────────────────────────────────────┐ Tool A ═══════╗ Tool B Corridor AGV1 ←── ═══════╝ ──→ AGV2 Conflict! Tool C ════════════ Tool D └─────────────────────────────────────┘Routing must prevent deadlocks and minimize wait time ``` **Routing Algorithm Factors**: | Factor | Impact | |--------|--------| | Traffic density | Avoid congested corridors | | Tool WIP levels | Prioritize starving tools | | Battery status | Route near charging stations | | Lot priority | Hot lots get faster paths | | Maintenance | Avoid PM-blocked routes |

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