CPM can be divided into three architectures according to its location: centralized, semi-distributed, and distributed, as shown in Figure 2-2, Figure 2-3, and Figure 2-4

If the CPM is placed at the center of the car and uses one module to unlock the four doors, it is called centralized architecture. Centralized architecture has a simple structure, is simple to develop, has low costs, can be placed anywhere inside the vehicle without space limitations, and is less likely to be damaged in a collision. However, the CPM is far from the door, resulting in slower response speed. The cable is easily damaged after a collision, the risk of single-point failure is high and redundancy is low.

If the CPM is placed on each door, it is called distributed architecture. In distributed architecture, the module is close to the door and has a fast response speed. When one module is damaged due to a collision, other modules can still function normally, so distributed architecture has high reliability and high redundancy. But due to four CPMs are needed, the cost will be increased. Additionally, the four door locks need to coordinate with each other, making the collaborative logic complex.

The last is semi-distributed architecture. Semi-distributed architecture is divided into a left domain and a right domain, with each domain containing a module that controls the locks. Its cost and redundancy are both between that of centralized and distributed architectures, making it a compromise solution.

Table 2-1 lists the comparison of three architectures. Centralized architecture is suitable for the car that is cost-sensitive and has high system integration requirements. A distributed architecture is more suitable for scenarios that require high response speed and redundancy, as well as diverse vehicle configurations.