Vehicle ECU Program Loading via Volatile Memory

The writing program is extracted from the nonvolatile memory and relocated to the volatile memory. The ECU receives the writing program via communication, expands it in the volatile memory, and executes it temporarily for writing operations. This extraction eliminates the need to permanently store the writing program in the nonvolatile memory, thereby reducing memory capacity waste while maintaining the writing function.

The volatile memory serves as an intermediary between the communication interface and the nonvolatile memory. Instead of directly storing the writing program in the nonvolatile memory, the system uses the volatile memory as a temporary workspace to receive, expand, and execute the writing program. This intermediary approach allows the writing function to be performed without permanently occupying nonvolatile memory capacity.

The ECU is manufactured in advance as a common unit with volatile memory and communication interface, but without a permanently stored writing program. The writing program is prepared and transferred via communication after manufacturing. This preliminary preparation allows the ECU to be produced as a universal platform, reducing manufacturing complexity and cost, while the programming is completed as a separate post-manufacturing step.

The ECU system transitions from a static configuration where the writing program is permanently stored in nonvolatile memory to a dynamic configuration where the writing program is temporarily loaded into volatile memory via communication. This dynamic approach allows the same ECU hardware to serve multiple vehicle types by flexibly loading different writing programs as needed, reducing manufacturing variety while maintaining adaptability.