초록 ▼

An overheat event location module for use with an existing overheat detection system in an aircraft. The module is non-intrusively connected to the overheat detection system, yet senses currents in the system. The module, by way of the sensed currents is able to distinguish true overheat events from

An overheat event location module for use with an existing overheat detection system in an aircraft. The module is non-intrusively connected to the overheat detection system, yet senses currents in the system. The module, by way of the sensed currents is able to distinguish true overheat events from false events (normally created in a test mode) and normal non-overheat conditions. The module is able to respond to the occurrence of an overheat event by measuring the currents in the sensing cable loop, then using the measured currents to produce an estimate of the position in the loop at which the overheat event occurred. Conveniently the module records both the fact of the event and its location, such that subsequent maintenance actions are facilitated.

대표청구항 ▼

[ What is claimed is:] [1.]1. A non-intrusive event location system configured to be retrofit to an overheat detection system which includes a controller and an elongate cable having a central conductor and a sheath separated by insulation capable of locally forming a conductive path between the con

[ What is claimed is:] [1.]1. A non-intrusive event location system configured to be retrofit to an overheat detection system which includes a controller and an elongate cable having a central conductor and a sheath separated by insulation capable of locally forming a conductive path between the conductor and sheath in the presence of an overheat condition, the controller having a run mode in which an alternating current drive is coupled to both ends of the cable to sense for an overheat condition, and test mode which grounds one end of the cable and drives the other, the event location system comprising in combination:a pair of non-intrusive current sensor circuits, one for each of the cable ends, and arranged to sense the magnitude and phase of current in the cable and produce associated output signals,a processor for monitoring the output signals and programmed to perform a calculation identifying the location of an overheat event along the cable based on the output signals and to store event location information on command,a "fault present" circuit connected to receive the output signals and configured to respond to the magnitude and respective phase thereof to command the processor perform said calculation when the magnitude of the output signals indicates a possible overheat event and the phase of the output signals indicates operation in the run mode.