Abstract: A display apparatus provides a three-dimensional pictorial representation of the position of a movable first member in relation to a stationary second member for the purpose of remotely positioning the first member to enable docking with the second member.

Abstract: An electroacoustic delay line apparatus is disclosed including an acoustic bulk wave generating transducer positioned at one end of a delay line, with a predetermined spacing being provided between the respective electrode elements of the transducer array, such that the acoustic energy radiation from the bulk wave transducers on the end of the delay line interfaces constructively for certain frequencies at selected positions on the sensor transducer surface of the delay line. Therefore each input signal frequency of the acoustic waves is translated into a desired position on the sensor transducer surface of the delay line. The elements of the transducer array are electrically phased such that any electrode element is phase shifted by .pi. radians relative to its nearest adjacent electrode element.

Abstract: A direct current motor controlling apparatus determines the operational speed of one or more direct current motors such as traction motors propelling a passenger vehicle along a track. The speed of the motor is established by changing the on and off conduction ratio or duty-cycle relationship of a switch device to determine the field current and the armature voltage of that motor. The present apparatus utilizes solid-state switch devices to determine the mode of operation of the motor control apparatus which solid-state switch devices are more reliable and more simple in operation and less expensive to maintain.

Abstract: There is disclosed a propulsion and brake effort control apparatus and method operative with the motors of a transit vehicle, including programmed microprocessor control apparatus for comparing the motor current desired by the vehicle control P signal with feedback information from the motor operation to determine the requested motor current by the phase angle relationship of ON and OFF pulses supplied to the current controlling chopper apparatus. The requested current and motor effort can be controlled by the operation of an effort control parameter provided in relation to high and low determined limits of the power supply line voltage, a high determined limit of the line current in relation to the motors and the current request signal.

Abstract: There is disclosed improved time slot scanner control apparatus, including a fail-safe control pulse former apparatus provided for each of a desired plurality of information time slots to sequence the data information transfer in relation to the respective track circuits operative with a transit vehicle. An information timing track is provided for sequencing this data information transfer and to reset the apparatus after each provided sequence of time slot control pulses.

Abstract: There is disclosed a passenger transit vehicle speed maintaining control apparatus and method, including an open loop acceleration control that is operationally modified by a closed loop speed control, for providing an improved control of vehicle speed in relation to a change of input speed command.

Abstract: A passenger vehicle door control apparatus and method, including programmed computer control apparatus responsive to open door code signals from the wayside in addition to a zero signal to indicate that the train of vehicles has stopped within a passenger station are operative to open the doors of all vehicles at the correct time on the correct side of the train when the train is within the station and traveling at less than a predetermined zero speed.

Abstract: There is disclosed a door motion control apparatus for the passenger entry and exit doors of a mass transit vehicle, which passenger entry and exit doors are opened by a drive motor when the vehicle is stopped at a desired location for passenger entry and exit within a station.

Abstract: An electroacoustic apparatus is disclosed for providing beam steered and focused compressional or shear waves, using an interdigital generating grid operative with one surface of a piezoelectric delay line member. The generating transducer is provided with electrode elements having a variable spacing determined by the location of a receiving transducer on another surface of the delay line. The electrode elements are energized in a predetermined phase relationship by an input signal. The apparatus is suitable for use to process signals as a pulse compression or pulse expansion dispersive delay line.

Abstract: A direct current motor power controlling chopper apparatus is disclosed which determines the operational speed of one or more traction motors propelling a passenger vehicle along a track. The speed of the motor is established by changing the ON and OFF conduction ratio or duty cycle relationship of a thyristor switch device to determine the field current and the armature voltage of that motor. The present apparatus can provide a greater controlled range of motor speeds including a lower minimum OFF operation and a full ON capacity. In addition, the present apparatus provides greater reliability due to less thermal stress on the thyristor switch devices and fewer circuit elements required to provide an improved motor current control operation.

Abstract: There is disclosed a passenger vehicle operation control apparatus and method including program microprocessor control apparatus for providing a dynamic output signal when the microprocessor completes a predetermined main computer control program subroutine and this dynamic output signal operates with a hardware logic circuit apparatus including a timing circuit such that a repetition rate in excess of that required to keep the timing circuit reset is required, otherwise the computer control program is reinitialized.

Abstract: A more failsafe signal voltage threshold determining apparatus is disclosed for operation in a train vehicle control system, and which utilizes the forward voltage drop characteristic of an input light emitting diode of an optical isolator device as a train vehicle control signal threshold reference. The detector transistor of the optical isolator device provides an output control signal in response to an input train vehicle control signal applied to the light emitting diode which has a voltage level high enough to overcome the light emitting diode voltage drop.

Abstract: The present invention relates to a train vehicle speed control apparatus which recognizes a change in one of the acceleration rate or the deceleration rate of a train moving along the track and the control of the train velocity in relation to what distance will be required for a desired operation of the train such as a predetermined decrease in the train speed or a stopping of the train. If the deceleration rate has changed, for example, the fixed physical system limits what control can be exercised and the velocity of the train can be modified to adjust the actual stopping distance used by the train or with a fixed stopping distance desired then the permitted train velocity can be changed.

Abstract: The present invention relates to an improved dynamic brake effort control apparatus for use with loads such as a transit vehicle, and which provides a better control of and blending of dynamic brake effort and friction brake effort in relation to the vehicle speed for the improved braking control of the transit vehicle.

Abstract: The present control system and method for a slab heating furnace is operative in relation to a predicted travel time of a theoretical control slab in the charge zone of the furnace and a predicted travel time of a theoretical control slab in the heat zone of the furnace as based upon the cycle time of an associated rolling mill. This operation is in relation to a desired distribution of heat content supplied by the charge zone and heat content supplied by the heat zone, and in consideration of a related temperature profile within each slab, for the determination of a temperature control setpoint for the charge zone and a temperature control setpoint for the heat zone such that a desired total heat content is provided within each slab before it enters the soak zone of the slab heating furnace.

Abstract: There is disclosed a passenger vehicle speed maintaining control apparatus and method, including program microprocessor control apparatus for controlling the vehicle speed in response to an acceleration or tractive effort request P signal.

Abstract: There is disclosed a programmed microprocessor control apparatus and method for a transit vehicle electric motor through operation of a chopper apparatus. The microprocessor program controls the motor braking effort in brake mode through operation of the brake resistors and the motor tractive effort in the power mode through the motor field shunt operation.

Abstract: 1. In passive detection and tracking apparatus, in combination, a plurality of directional signal obtaining means for obtaining from radiant energy received from the same source a plurality of signals which vary in predetermined manners with variations in the direction from the passive detection and tracking apparatus to said source, gating means operatively connected to said plurality of signal obtaining means, and indicator means operatively connected to said gating means, said gating means being constructed and arranged to pass to the indicator means certain signals only while said plurality of signals have preselected relative characteristics with respect to each other, said indicator means being constructed and arranged to utilize the passed signals to provide an indication of the direction to said source.

Abstract: A speed decoding and error determining control apparatus and method are disclosed, including two independently programmed microprocessors responsive to a desired speed command from the wayside for determining respective speed errors for a coupled passenger vehicle, which speed errors must compare within a predetermined tolerance before the speed command is permitted to control the actual speed of the passenger vehicle.

Abstract: A signal bandpass filter apparatus is disclosed wherein a direct short circuit between input and output is prevented and the loss of the ground reference of the filter is detectable and fail-safe in operation.