Mitsubishi Denki Kabushiki Kaisha

Shigemi Iwata

Hiroyuki Ikejima

Ryuichi Kajiyama

Masahide Okumura

Satomi Ikejima

Terumi Hirabayashi

Kenzo Tachino

Junichi Tanino

Yasuhiro Nagata

Tomoichiro Yamamoto

Shigeo Kitagawa

Koichi Tamura

An elevator adjusting apparatus for adjusting a brake torque produced by a brake for braking travel of an elevator cage includes a brake torque adjustment mode setting unit for setting an adjustment mode for the brake torque, a cage position recognizing unit for recognizing a cage position, a cage speed detecting unit for detecting a cage speed, a brake actuation command generating unit for reissuing a brake actuation command generating unit for issuing a brake actuation command when the brake torque adjustment mode is set by the brake torque adjustment mode setting unit and the cage position recognizing unit recognizes that the cage position has reached a predetermined position of a lift passage, a brake control unit for actuating the brake in response to the brake actuation command issued from the brake actuation command generating unit, and a brake torque calculating unit for calculating the brake torque based on the cage speed detected by the cage speed detecting unit during the brake actuation. With the apparatus, the brake torque can be adjusted simply accurately and efficiently without using any weights.

Apparatus to automatically adjust spring tension of an elevator brake to

An elevator control apparatus comprises a drive for driving the car door of an elevator, an operation management control device which is installed in a machine room of the elevator and which generates not only a command signal for controlling the operation management of the car, but also a door open ready signal, a door control device which is installed in the car and which controls the drive device based upon the command signal generated by the operation management control device. The door control device also generates status signal indicating the status of the door. The elevator control apparatus further comprises a first serial-parallel converter for serializing the command signal generated by the operation management control device, a second serial-parallel converter which deserializes the command signal serialized by the first serial-parallel converter and which serializes the status signals generated by the door control device, a serial transmission line which connects the first and second serial-parallel converters to each other and which transmits the serialized command signal and the serialized status signals, an open ready signal line which connects the operation management control device and the door control device to each other, and which transmits the door open ready signal from the operation management control device to the door control device.

Apparatus for controlling the opening and closing of electric doors

An elevator control apparatus comprises drive device for driving an elevator car and a pulse generator, which is connected to the drive device and which generates pulses, the number of which are proportional to the travel distance of the car. The apparatus also comprises computing device for present car position for computing the present position of the car by counting the number of pulses from the pulse generator, computing device for predicted stop position for computing a predicted stop position of the car in case of a power failure during the travel of the car, first memory for storing data of the predicted stop position of the car and for maintaining that data, and second memory for previously storing position data of each floor in relation to an elevator. The elevator control apparatus further includes control device for controlling the drive device based on the present position of the car and the data stored in the second memory, and computing device for correcting car position at power failure for correcting, upon recovery from the power failure, based on the data stored in the first memory and the second memory, the present position of the car, which is computed by the computing device for present car position before the power failure occurs.

Elevator control apparatus

An emergency intercommunication system for an elevator has an interphone unit and an intercommunication command switch located in an elevator car. A telephone number input apparatus for inputting the desired telephone number is provided in an elevator hall, in connection with a register apparatus for storing the input telephone number. An intercommunication command detecting section for detecting the actuation of the switch is provided in connection with an emergency call apparatus for automatically dialing the stored telephone number to connect the interphone unit with a telephone having the telephone number when the actuation of the switch is detected by the detecting apparatus. Preferably, an identification number input apparatus is provided in the elevator hall so that the register apparatus stores the telephone number only when it is input together with a predetermined identification number.

Emergency intercommunication system for elevator

An elevator control apparatus which compensates for an insufficient gain of the entire control system caused by a drop in power source voltage or the like includes an electric power control circuit for controlling electric power for feeding to an electric motor which drives the car of an elevator, a speed command generating circuit for generating a speed command signal of the car, a speed detecting circuit for detecting the speed of the car, a computing circuit for calculating the deviation between a speed detecting signal obtained by the speed detecting device and a speed command signal generated by the speed command generating circuit, a compensating circuit for outputting an electric power command signal in which gain properties and phase properties have been compensated in accordance with the deviation calculated by the computing circuit, a comparing circuit for determining whether or not the deviation calculated by the computing circuit exceeds a first specified value, and a damping gain setting circuit for, when the comparing circuit determines that the deviation exceeds the first specified value, adding a correction value which is based on the deviation to the electric power command signal from the compensating circuit in order to output the added correction value as an electric power control signal to the electric power control circuit.

An apparatus for controlling an elevator according to the present invention has a master microcomputer having a plurality of slave microcomputers and memory means for storing in advance at least one of control data and control program necessary for the slave microcomputers, and transmitting means connected between the master microcomputer and a plurality of slave microcomputers for individually transmitting at least one of the control data and control program from the master microcomputer to the respective slave microcomputers.

Apparatus for controlling an elevator

An apparatus for controlling an elevator adds cage moving distances per unit time by advance position calculating means at predetermined time to a reference value in parallel with the running operation of the elevator, corrects the moving distance by advance position correcting means in accordance with plate position information at the time of detecting the plate disposed in an elevator shaft in a position corresponding to a floor, and then compares the actually moved distance with the plate position information stored in a memory to obtain a cage advance floor.

A safety device for an elevator which has a converter for converting a 3-phase A.C. power source into a D.C. power source, a control circuit for the elevator employing as a power source the D.C. power source outputted from the converter, a level converter for converting the voltage of the D.C. power source outputted from the converter into a logic level, and defective phase detecting means for detecting the defective phase of the 3-phase A.C. power source by dividing the output signal of the level converter in a time division manner.

Safety device for elevator

An elevator control apparatus in which a stop position command signal for floor arrival at each floor is generated irrespective of the position of a plate; comprising cage position-calculation means for calculating the current position of a cage on the basis of the movement value of the cage, floor height value-memory means for storing the floor heights of respective floors, stop position command signal-calculation means for calculating the stop position command signal for each floor on the basis of the current position of the cage and the height value, and memory write/read means for adjusting the error of the stop position command signal ascribable to the deviation of the plate by rewriting offset data defined in correspondence with each floor.

A control apparatus for an elevator according to this invention comprises a signal setter for setting a new value instead of a value of great variation when at least one signal at the present time among a transmission reference speed command signal transmitted to a speed controller through a transmission interface, a cage speed signal, and a controlled variable based on these signals greatly varies as compared with the time-serial value of the corresponding signal detected in the past. In this invention, the signal setter stores a value at the present time and also stores serially past values with respect to time as to the transmitted reference speed command signal, the cage speed signal, or the controlled variable based on these signals, and it sets the new value not greatly varying, as a present value if the value at the present time greatly varies in view of the past serial values of the corresponding signal. Accordingly, even if any of the transmission interface, cage speed signal-detector, etc. should fail or operate erroneously, the safety of passengers can be secured, and the elevator equipment can be prevented from being damaged.

Control apparatus for elevator

In an elevator control system employing a variable-voltage and variable-frequency control, a control apparatus having limiter for limiting the maximum value of a slip frequency .omega..sub.s when the frequency .omega..sub.0 of current command values to be delivered to an inverter circuit for operating an induction motor is evaluated in accordance with a condition formula of .omega..sub.0 =.omega..sub.s +.omega..sub.4 (where .omega..sub.r denotes the angular rotational frequency of the induction motor), whereby an actual car speed can be limited to a safe low value even when the detected car speed is erroneous due to a malfunction of the car speed detection device. Also, the time period during which the generated slip frequency command signal exceeds a reference value is measured to determine the current frequency command signal for the induction motor.

The actual floor level of each of the floors of a building is determined and stored as a data point in memory by detecting, for each floor, the position of a point located a predetermined distance above the floor level and the position of a point located a predetermined distance below the floor level, storing data representing the above and below points in memory, and calculating a data point for the actual floor level located at the midpoint between the points above and below the actual floor level in the case where the points are the same predetermined distance above and below the actual floor level. The data stored in memory as to the positions of the points is continuously updated each time the elevator cage passes by each floor, and the data point of the actual floor level is recalculated to provide an updated and accurate representation of the actual floor level in memory to account for cable stretch and other mechanical or electronic variations. The positions of the points are determined by counting pulses generated responsive to cage movement.

An elevator control apparatus for controlling operation of a cage in an elevator system in which a normal speed command signal is generated having a normal pattern providing gradually decreasing terminal speed as the cage approaches a level of a terminal floor; a terminal-floor slowdown signal is generated having a normal pattern generally similar to the normal pattern of the normal speed command signal and separated therefrom by a magnitude determined by a bias value; the normal speed command signal is chosen as a final terminal slowdown command signal for controlling terminal speed of the cage when, based on comparing the command signals, the normal speed command signal is less than the terminal-floor slowdown command signal, or the terminal-floor slowdown command signal is chosen as the final terminal slowdown command signal for controlling terminal speed of the cage when, based on comparing the command signals, the normal speed command signal is not less than the terminal-floor slowdown command signal; and the terminal-floor slowdown command signal is corrected when chosen as the final terminal slowdown command signal by changing the bias value used in generating the final terminal-floor slowdown command signal; whereby the final terminal slowdown command signal follows at least a final portion of the normal pattern of the normal speed command signal.

An elevator position detecting device which provides a correct floor position output signal even if the elevator case is moved irregularly between floors. In a first embodiment, a single cam is provided between each two adjacent floors and a single detector attached to the elevator cage produces an output signal to an electronic calculator each time the detector meets the engaging cam for upward member and leaves the cam for downward movement. A digital value corresponding to one floor is added to or subtracted from, respectively, a floor memory of the electronic calculator. In a second embodiment, two cams are provided between each two adjacent floors with each of the two cams being a fixed distance away from its adjacent floor. Two detecting means are provided on the elevator cage in this case and the content of the floor memory is divided by two to provide a correct cage position signal.

Elevator position detecting device

A system which includes a micro-computer which is responsive to an elevator car reaching a predetermined distance from a terminal floor and arranged to calculate a residual distance between the actual position of the car and the floor so as to generate a command normal deceleration signal concerning that distance, and a command terminal deceleration generator which is responsive to the successive actuations of plural terminal sensors disposed adjacent of the floor within an associated hoistway so as to generate a command terminal deceleration signal which is successively decreased. When the car engages any of the terminal sensors, the micro-computer similarly calculates a residual distance between the position of the engaged terminal switch and the floor so as to generate a command auxiliary terminal deceleration signal concerning that distance.

Growing community of inventors

Inazawa, Japan

Shigemi Iwata