Centralised Electrical/Electronic Architecture (Centralised EEA)

Centralised Electrical/Electronic Architecture (Centralised EEA) represents the foundational technological revolution driving the automotive shift from "distributed" systems to "intelligent" mobility. If a distributed architecture is akin to a "tribe" of countless independent small teams where every single function has its own dedicated "brain" (ECU), a centralised architecture consolidates these functions into one or a few powerful "central brains" (domain controllers/central computing platforms) to command overall vehicle operations. It serves as the core prerequisite for achieving "Software-Defined Vehicles" (SDV) and full-vehicle over-the-air (OTA) updates.

Core Characteristics

The essence of a centralised architecture lies in centralised computing power and hardware-software decoupling. Compared to traditional distributed setups, its key advantages are reflected in three main areas:

From "Scattered Brains" to a "Central Command"

Under traditional distributed architectures, a modern vehicle could house 70 to 100 standalone ECUs, with the wiring harness spanning 2 to 5 kilometres in total length. Each ECU operated in silos with low communication efficiency, resulting in substantial cost and packaging penalties. A centralised architecture, powered by high-performance Domain Control Units (DCUs) or central computing platforms, consolidates and integrates these scattered functions, drastically slashing ECU counts whilst optimising interior packaging and vehicle layout.

• Higher Computing Power: High-performance domain controllers can house significantly more potent processors to execute complex algorithms. For instance, GAC's Xingling architecture claims an estimated 50-fold leap in computing power.

• Weight Reduction: Shorter wiring harnesses and fewer ECUs yield substantial weight savings. For example, by adopting a domain controller setup, the Tesla Model 3 slashed its wiring harness length from several kilometres in conventional layouts to around 1.5 kilometres, reducing costs by roughly 20%.

From "Signal Broadcasting" to "Service Sharing"

In legacy architectures, ECUs broadcast signals across CAN or LIN bus networks with limited communication throughput. A centralised architecture introduces Automotive Ethernet (1 Gbps or higher) as the core backbone network alongside a Service-Oriented Architecture (SOA). This allows software functions to be flexibly configured and called upon, truly delivering a collaborative "single command, multiple responses" capability.

Keeping Cars "Always Fresh"

The most tangible benefit for car owners is full-vehicle Over-The-Air (OTA) update capability. With hardware and software decoupled in a centralised architecture, carmakers can remotely update multiple onboard controllers, continually optimising core aspects like powertrain, chassis dynamics, and Advanced Driver Assistance Systems (ADAS)—effectively turning the car into an ever-evolving smart device.

Key Architectural Configurations

According to the industry-recognised roadmap outlined by players like Bosch, centralised EEA primarily evolves through two main stages:

1. Domain-Centralised Architecture (Domain Centralised EEA)

This is currently the mainstream solution across modern smart vehicles. It categorises vehicle systems into several functional "domains" (such as autonomous driving, smart cockpit, and vehicle control), with high-performance Domain Control Units (DCUs) governing all functions within each respective domain. For instance, the second-generation EEA in the XPENG P7 uses three dedicated domain controllers for autonomous driving, cockpit, and chassis, enabling full-vehicle OTA updates.

• Mainstream Setup: The industry standard today is the "three-domain architecture", comprising the Vehicle Domain Controller (VDC), Autonomous Driving Domain Controller (ADC), and Cockpit Domain Controller (CDC).

2. Central Computing + Zonal Architecture (Central Computing + Zonal EEA)

Representing the definitive next-generation architecture, this approach concentrates the vehicle's processing power into one or two central computing platforms. Instead of grouping by function, it divides the car into "zones" based on physical locations (such as left, right, and front sections), with Zonal Control Units (ZCUs) managing localised I/O controls and power distribution. This setup drastically cuts wiring harness length and achieves maximum weight reduction.

• Latest Developments: At CES 2026, AutoLink unveiled its "Deep Fusion Electrical/Electronic Architecture (Deep Fusion EEA)", which combines a central computing platform, zonal controllers, and an ultra-fast optical communication backbone to deliver deep cross-domain integration, marking a major milestone for the technology. Leapmotor has also showcased its "Four-leaf Clover" central integrated architecture, employing a single SoC and MCU combination to control the four core domains: cockpit, autonomous driving, powertrain, and body electronics.

Key Takeaway: While centralised EEA serves as the essential hardware and communication backbone for high-level autonomous driving and smart cockpit capabilities, it remains an underlying engineering and manufacturing architecture. Drivers do not need to concern themselves with the technical architecture beneath the skin during day-to-day driving; however, understanding it explains why modern smart vehicles can continually gain new features via software updates, just like a smartphone.