CONTROL OF ELECTRICALLY POWERED ACTUATION DEVICE

摘要

An electrically powered actuation device (12) selectively operable to be in a first operating mode or a second operating mode is controlled by providing means (17) for monitoring means for substantially continuously monitoring the current flow in the actuation device thereby to enable the supply (15) of electrical energy to the device to be switched off when the current level reaches a first current datum level (20) which is related to that current level which is sufficient to cause actuation of the device to a first operating mode and to enable the supply of electrical energy to be restored when the current level in the device falls to close to the minimum level (21) required to maintain the device in said first operating mode.