Patent ID: 11941384
Assignee: DENSO CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G  B | IPC B  G

Claim 0:
1. A vehicle master device that is configured to acquire update data from a distribution device configured to distribute the update data, distribute the acquired update data to a plurality of rewrite target electronic control units (ECUs), and instruct the plurality of rewrite target ECUs to rewrite a program, the vehicle master device comprising:
a rewrite specification data acquisition unit that is configured to acquire rewrite specification data that is generated in association with the update data;
a rewrite specification data analysis unit that is configured to analyze the rewrite specification data acquired by the rewrite specification data acquisition unit;
a group generation unit that is configured to divide the plurality of rewrite target ECUs to generate one or more groups based on the rewrite specification data analyzed by the rewrite specification data analysis unit; and
an instruction execution unit that is configured to instruct the plurality of rewrite target ECUs for each group of the one or more groups generated by the group generation unit to perform at least one of installation, rollback, and activation, wherein the instruction execution unit is further configured to instruct the plurality of rewrite target ECUs in an order determined based on the rewrite specification data when giving an instruction for installation;
when giving the instruction for installation to the plurality of rewrite target ECUs, the instruction execution unit is further configured to instruct the plurality of rewrite target ECUs in the order that is indicated by the rewrite specification data to perform installation; and
when the plurality of rewrite target ECUs include a rewrite target ECU having a single-bank memory and a rewrite target ECU having a double-bank memory in one of the one or more groups, the instruction execution unit is further configured to instruct the rewrite target ECU having the double-bank memory first to perform installation, and then instruct the rewrite target ECU having the single-bank memory last in the one of the one or more groups to perform installation.