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| Re: Canarsie CBTC (98962) | |||
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Re: Canarsie CBTC |
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Posted by tracksionmotor on Tue Jun 14 22:34:09 2005, in response to Re: Canarsie CBTC, posted by Jeff H. on Tue Jun 14 21:13:06 2005. IF I remember correctly, Bombardier R142s have no motor tach output.However, the motor goes to a gearbox which drives the axles which have a gear wheel like automobiles use for anti-lock brakes that's scanned by an inductive pick-up. The PCE package also monitors curent/power demand of the tractionmotors along with everything else available on downloads and 'black box.' NYCTA 'New Tech' has brakes on all eight wheels. The 1999 Paris rubber tired units have brakes on seven wheels...the eigth wheel is always accurate for speed and distance. This is the cause of error when trainsets 'get lost' and prematurely announce stations. In London, the Bombardier trainsets are 'tweeked' by transponders for correction. Trainset...tractionmotor...gearbox...anti-lock brake sensor (no 'slip and slide' traction control on R142s yet)...wheel diameter/distance/speed...PCE IGBT current sensing....all go to the system computer for analysis. Speedometer remains the VDO microwave Doppler, independent of trainset systems. Anyone with a tuning fork??? CI peter |
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