Abstract: The invention provides a platform gate door device equipped with highly reliable photoelectric obstacle detectors that do not malfunction by disturbance light that moves, such as sunlight. The platform gate door device comprises a platform gate door 13 installed on a platform at a position where passengers get on and off a vehicle; a door control device 4 for opening and closing the platform gate door; at least two photoelectric obstacle detectors 2 disposed between the platform gate door 13 and the vehicle for detecting a presence of an obstacle, wherein each obstacle detector 2 has a light emitter 21 and a light receiver 22 disposed on either side of an opening 12 of the platform gate door, and wherein the obstacle detectors 2 are arranged so that the direction of emission from the light emitters are mutually inversed; and a switching means 3 for activating one of the plurality of obstacle detectors.

Abstract: The invention provides a platform gate door device equipped with highly reliable photoelectric obstacle detectors that do not malfunction by disturbance light that moves, such as sunlight. The platform gate door device comprises a platform gate door 13 installed on a platform at a position where passengers get on and off a vehicle; a door control device 4 for opening and closing the platform gate door; at least two photoelectric obstacle detectors 2 disposed between the platform gate door 13 and the vehicle for detecting a presence of an obstacle, wherein each obstacle detector 2 has a light emitter 21 and a light receiver 22 disposed on either side of an opening 12 of the platform gate door, and wherein the obstacle detectors 2 are arranged so that the direction of emission from the light emitters are mutually inversed; and a switching means 3 for activating one of the plurality of obstacle detectors.

Abstract: An elevator control system for controlling movement of cages up and down in accordance with the situation of waiting persons in landing places or passengers in the cages detected by image pickup devices and other detecting devices includes first and second image processors, the image processing level of the second image processor being not lower than that of the first image processor. The system further includes an elevator controller for controlling movement of the cages up and down, the elevator controller including a device for applying the result of image processing performed by the first image processor to the control of the cages, and a device for applying the result of image processing performed by the second image processor to the control of the cages when the image processing is carried out based on the result of image processing performed by the first image processor and other information pertaining to passengers and waiting persons detected by the other detecting devices.

Abstract: An image of an elevator hall or an inside of elevator car is acquired by photographing apparatus, and the number of waiting passenger is detected by comparing the above-mentioned image with a background image when no passenger is present at the elevator hall. Second image processing apparatus with high precision is prepared by the same image information as that of first image processing apparatus, teacher information derived therefrom is compared with an output from the first image processing apparatus. If the teacher information is not coincident with the output from the first image processing means, parameters required for performing the image process by the first image processing appartus, for instance, constants, threshold values and weight coefficients employed in an image processing algorithm are adjusted.

Abstract: The commencement of a developing period of slip is detected by the fact that a time-differential value v.sub.s of a creep velocity v.sub.s (a relative velocity between a peripheral velocity v.sub.m of a driving wheel and a vehicle velocity v.sub.t) exceeds a predetermined reference .delta..sub.1. The termination of the developing period is detected by the fact that a time-differential value v.sub.m of the peripheral velocity v.sub.m becomes equal to zero. During the developing period, a torque command Tp to a main motor controller is decreased by a re-adhesion control signal Tfa which is formed by the combination of a time-dependent component e.sub.1 and a slip-dependent component e.sub.2. After termination of the developing period, the torque command Tp is decreased with time at an appropriate time constant. According to the present invention, the arithmetic logic operation for control can be much simplified without any deterioration of a adhesion performance of an electric vehicle.