| 摘要 |
A control system for a pneumatic hoist limits the velocity or acceleration of a load attached to the hoist. The control system includes a controller and a valve. The controller provides a variable gain between an actuator, which controls the speed of the hoist, and the valve, which controls fluid flow into the hoist, thereby controlling the velocity or acceleration of the load. As the velocity or the acceleration of the load reaches a predetermined maximum value, the control system proportionally reduces the gain between the actuator and the valve, thereby closing the valve and reducing the velocity or acceleration of the hoist.
|
