| 摘要 |
PROBLEM TO BE SOLVED: To increase operational efficiency in writing control programs into a plurality of controllers. SOLUTION: The control programs obtained from an external tool 300 are written into a second ROM 13 of each ECU 10 after being accumulated in a RAM 24 of a gateway 20. Thus, after the program data are accumulated in the RAM 24 of the gateway 20, the control programs are written into the ECUs 10 without the need to maintain a connection with the external tool 300. In this way, since the standby time during which the connection with the external tool 300 must be maintained is reduced, when the control programs are continuously written into the plurality of ECUs 10 during the process of manufacturing a vehicle installing a program writing system 1, the time when the external tool 300 is connected to each ECU 10 is reduced to increase overall operational efficiency. COPYRIGHT: (C)2005,JPO&NCIPI
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