Electronic position and velocity control system with cold start compensation

摘要

An electronic system for controlling the extent of motion in the start and stop positions of a hydraulically driven member includes cold start compensation. The driven member is equiped with a voltage sensitive circuit which provides a voltage indicative of the position of the driven member along its path of motion. The position indicative voltage is compared with reference voltages and the resulting comparison voltages actuate switching circuitry to effect changes in the acceleration and deceleration of the driven member and to control the start and stop positions of the driven member. Hydraulic or mechanical apparatus responsive to the switching circuitry controls the motion extend and velocity of the driven member in accordance with the comparison voltages. A cold start compensation circuit is associated with one of the reference voltages and is operative for a predetermined period of time after energization of the system to incrementally vary one of the reference voltages so as to incrementally vary the location of the movable member at which deceleration is started.