door engine; automatic door operator
Wasei-eigo term for the motorized mechanism that opens and closes doors automatically, commonly found in trains, buses, and building entrances.
wasei-eigo (Japanese-coined English), from door engine
The train's door engine broke down and the doors wouldn't open.
このビルには最新式のドアエンジンが設置されている。
This building is equipped with the latest door operating equipment.