| CPC B65G 43/02 (2013.01) [B65G 1/0457 (2013.01); H01L 21/67259 (2013.01); H01L 21/67733 (2013.01); B65G 2203/0283 (2013.01); B65G 2203/0291 (2013.01)] | 14 Claims |
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1. A method of controlling an overhead hoist transfer (OHT) vehicle, the method comprising:
stopping a control target vehicle in which a vehicle motion controller decelerates and stops the control target vehicle as the control target vehicle reaches a proximity threshold distance to a preceding vehicle;
starting the control target vehicle in which the vehicle motion controller starts the control target vehicle as a separation distance between the control target vehicle and the preceding vehicle exceeds a start separation distance considering a buffer distance or a buffer waiting time;
starting vehicle operation in which the vehicle motion controller receives a stop detection default setting command based on the proximity threshold distance, together with an operation command of the control target vehicle, from an overhead hoist transfer control system (OCS) that establishes an operation plan of the OHT vehicle and operates the OHT vehicle, sets a detection default of a preceding vehicle detector as a stop detection default, and starts operation of the control target vehicle, wherein the stopping of the control target vehicle comprises:
receiving a detection signal of reaching the proximity threshold distance, in accordance with the stop detection default, from the preceding vehicle detector to decelerate and stop the control target vehicle, and transmitting a vehicle stop report to the OCS; and
receiving a start detection default setting command, based on the start separation distance obtained by adding the buffer distance to the proximity threshold distance, from the OCS, and resetting the detection default of the preceding vehicle detector as the start detection default setting command, and
wherein the starting of the control target vehicle comprises:
receiving a detection signal of exceeding the start separation distance, in accordance with the start detection default setting command, from the preceding vehicle detector to start the control target vehicle, and transmitting a vehicle start report to the OCS; and
receiving the stop detection default setting command from the OCS, and resetting the detection default of the preceding vehicle detector as the stop detection default.
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