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New York City Transit Hybrid and CNG Transit Buses: Interim Evaluation Results - page 30 / 64

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Queens Village is approaching an MBRC of 10,000. The propulsion-related MBRC for both depots jumped in December 2004 (this is not as noticeable for Mother Clara Hale because of the longer data period prior to the change). The most common RCs for the propulsion system were related to the engine and the hybrid control system shutdown or problem indicator lights. Many of the shutdown indicators for the hybrid propulsion system did not necessarily mean there was a repair required for the propulsion system. Problems in other systems can also be indicated by the propulsion control system.

Miles Between Roadcalls (MBRC)

10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000

1,000 0

Apr-04

Jun-04 Aug-04

Oct-04

Dec-04 Feb-05 Apr-05

MCH Total MBRC QV Total MBRC

MCH Propulsion MBRC QV Propulsion MBRC

Figure 12. Hybrid Fleet Cumulative Average MBRC

Specific maintenance items that have been worked on the hybrid buses have been:

  • Radiator baffle—surge tank overflowing

  • Water in wiring/connectors

  • Engine grid heater relay

  • Water in engine from air intake

  • Issues with the triple pump

  • Power control system (PCS) internal coolant leaks; some modification to the cooling system was done.

  • Software upgrades; moved some of the propulsion fault codes from the dash display to be on the engine compartment display; changed signal processing to be more tolerant of wiring intermittent signals.

The entire Orion VII fleet (CNG and hybrid) is currently undergoing a warranty maintenance campaign to address the items listed above for both groups. This is a significant fleet campaign that is planned to be completed by the end of 2005.

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