US 11,866,295 B2
Active braking for immediate stops
Prasanna Nagarajan, Farmington, CT (US); David Ginsberg, Granby, CT (US); Shashank Krishnamurthy, Glastonbury, CT (US); Daryl J. Marvin, Farmington, CT (US); and Ronnie E. Thebeau, Haddam, CT (US)
Assigned to OTIS ELEVATOR COMPANY, Farmington, CT (US)
Filed by OTIS Elevator Company, Farmington, CT (US)
Filed on Aug. 20, 2018, as Appl. No. 16/105,581.
Prior Publication US 2020/0055693 A1, Feb. 20, 2020
Int. Cl. B66B 1/32 (2006.01); B66B 5/00 (2006.01); B66B 5/02 (2006.01); B66B 5/04 (2006.01)
CPC B66B 1/32 (2013.01) [B66B 5/0031 (2013.01); B66B 5/0037 (2013.01); B66B 5/02 (2013.01); B66B 5/04 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An elevator system control system, comprising:
a sensor system configured to sense elevator car conditions;
a safety system signaling element to generate a safety signal indicative of an incident;
a driving machine;
a braking assembly;
a drive component which comprises a controller receptive of elevator car condition data and a power section configured to normally operate the driving machine and the braking assembly autonomously; and
a control system comprising a safety controller that resides in the drive component and that operates primary and secondary brakes in accordance with elevator car condition data and the safety signal, the control system being configured to react to the safety signal;
wherein, in response to the control system receiving the safety signal indicating that an incident has occurred that requires engagement of at least one of the primary brake and the secondary brake, the control system controls a deceleration rate during the incident 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 primary brake in accordance with the determining,
determining whether the deceleration rate is above, below or within a target range, and,
with the primary brake remaining the primary brake and the secondary brake remaining the secondary brake, adjusting the deceleration rate based on signals from the sensor system 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.