Electricity: motive power systems – Automatic and/or with time-delay means
Patent
1995-11-16
1997-10-14
Masih, Karen
Electricity: motive power systems
Automatic and/or with time-delay means
307 101, 363124, 361160, 36442401, G05B 500
Patent
active
056776080
ABSTRACT:
A system for controlling the operation of a door comprising a first microprocessor and a second microprocessor each having a plurality of inputs for sensing the status of a vehicle. The plurality of inputs include a no motion trainline input, an open trainline input, an unlock trainline input and a close trainline input. The first microprocessor also has a close grant input for receiving a close grant signal from the second microprocessor while the second microprocessor also has a close request input for receiving a close request signal from the first microprocessor. The system also includes a motor for opening and closing the door and a motor relay circuit device, controlled by the microprocessors, for controlling the direction of power flow through the motor. When the motor relay circuit device activates, the motor is enabled to open the door and when it deactivates the motor is enabled to close the door. The system further includes a motor chopper control for controlling the delivery of power to the motor. The motor chopper control is controlled by the microprocessors so that when the motor relay circuit device activates, the motor chopper control delivers power to the motor to open the door and when it deactivates the motor chopper control delivers power to the motor to close the door. If at least one of the microprocessors detects a system malfunction, the motor chopper control will be disabled thereby preventing power flow to the motor and operation of the door.
REFERENCES:
patent: 4551601 (1985-11-01), Nishimura
patent: 4679508 (1987-07-01), Fruehan et al.
Corvin John H.
Greer David A.
Masih Karen
Westinghouse Air Brake Company
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