Abstract: A door control system, particularly suited for multiple door rapid transit vehicles wherein car operating parameters including car speed sensing (5), traction propulsion sensing (7), and other indications of internal circuitry establish and continuously test for predetermined conditions under which a power operated door can be opened. A low speed detector (1) incorporates a micro-processor (8) and a no motion relay (3) to evaluate car and circuit operating conditions, providing control of all transit car doors. The micro-processor and associated control equipment also recognize predetermined failure modes. Occurrence of predetermined failure modes results in the overall system (1) reverting to a more conservative state. Coded indication (2) of failure modes is provided for easy indentification and corrective action by train operating crews.

Abstract: An onboard unit consisting of a tape recorder, and associated data handling components utilized to provide records of vehicular operating information including speed, distance, power level, braking level, traction motor current and other control events. Each quantity is associated with an incremental distance and/or time which is fixed. In the case of a rail guided vehicle, location signals provided by ground mounted markers are also recorded. Summation of incremental distances as determined from each marker provides an exact location. A magnetic tape unit provides both data storage and operations instruction for a microprocessor based system, allowing convenient alteration or variations in unit function without internal modification. Each unit retains a unique non-volatile serial number which is transferred to each tape allowing convenient correlation of recorded tapes to onboard units.