Patent ID: 11866295
Assignee: OTIS ELEVATOR COMPANY
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 4:
5. An elevator system, comprising:
an elevator car;
a driving machine to drive elevator car movements;
a braking assembly to apply a braking force in opposition to the elevator car movements; and
a control system comprising a safety controller, which resides in a drive component comprising a controller receptive of elevator car condition data and a power section configured to normally operate the driving machine and the braking assembly autonomously, the control system being configured to control a deceleration rate during an incident requiring engagement of at least one of primary and secondary brake to decelerate the elevator car movements by:
determining which of the driving machine and the braking assembly is to be operated as the primary brake and the secondary brake,
operating the driving machine or the braking assembly as the primary brake in accordance with the determining,
determining whether the deceleration rate is above, below or within a target range, and
adjusting the deceleration rate in response to the deceleration rate being outside the target range by adjusting the operating of the primary brake when the deceleration rate is determined to be above the target range and by operating the secondary brake when the deceleration rate is determined to be below the target range.