B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
346/65
B61L 21/04 (2006.01) B61L 3/00 (2006.01)
Patent
CA 1053787
ABSTRACT OF THE DISCLOSURE This disclosure relates to a propulsion, braking and sta- tion stopping circuit arrangement for rapid transit trains. In a propulsion operating mode actual velocity signal and a de- sired velocity signal are coupled to a first summing and ampli- fying circuit for producing a velocity error signal. A second summing and amplifying circuit receives the velocity error sig- nal and a multiple actual acceleration signal to produce a propulsion error signal. An absolute value and signal deter- mining circuit receives the propulsion error signal and pro- duces an up/down signal and an analog signal to drive a clock. The up/down signal and pulses from the clock are applied to the advance train line register and the propulsion train line encoder to control the propulsion effort of the train. In a braking operating mode, the velocity error signal is combined with another multiple actual acceleration signal to provide a speed control brake error signal. The speed control brake error signal is fed to a clamping circuit which is enabled by a zero and down signal to allow the speed control brake error signal to pass through a timing and gating network and to the input of an output amplifier. The output amplifier produces a brake error signal which deactivates a brake relay through a comparator and relay driver circuit and which causes the appli- cation of the braking effort through a train line wire driver. In a station stop operating mode, the actual acceleration sig- nal and a calculated deceleration signal are summed by a sum- ming network to produce a station stop brake signal which is coupled through a timing circuit to a gate. When the calcu- lated actual deceleration is approximately ninety (90) per cent of the value of the desired acceleration signal, a comparator supplies a signal through an OR gate to the second summing and amplifying circuit to drive the propulsion effort to a coast condition. Now when the calculated deceleration and desired acceleration signals are equal, another comparator disaables the gating circuit and enables the gate to permit the station stop brake error signal to be applied to the input of the output amplifier. Again, the brake relay is deactivated through the comparator and relay driver circuit and a brake error signal is conveyed over the train line wire driver to apply the brakes of the train. A flare signal removes the station stop brake error signal from the output amplifier at a predetermined distance from the stopping point to allow the train to come to a smooth stop, and a holding signal causes a preselected braking effort to be applied to the brakes un- til the train is ready to get underway.
249152
LandOfFree
Circuit arrangement for controlling the propulsion, braking... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit arrangement for controlling the propulsion, braking..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit arrangement for controlling the propulsion, braking... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1115544