Evolution from Domain-Centralized to Zonal Topologies: Harness Mass Reduction & Bandwidth Scaling

In legacy domain architectures, every individual sensor and actuator runs dedicated copper wiring back to a centralized domain ECU (e.g., all door locks and lights routing to a central Body Control Module). This created vehicular wiring harnesses exceeding 4 kilometers in length and weighing over 65 kilograms—the third heaviest and most labor-intensive subsystem in a car.

Zonal architecture revolutionizes this: the vehicle is partitioned geometrically into physical zones (e.g., Zone Front Left, Zone Front Right, Zone Rear). All local sensors and actuators connect to their nearest Zone Controller Unit (ZCU) over short, localized cables. The ZCUs digitize and aggregate all signals, routing them over a single, lightweight, high-speed Time-Sensitive Networking (TSN) Automotive Ethernet backbone to the central vehicle compute cluster.