New York City Transit Diesel Hybrid-Electric Buses Final Results: DOE/ NREL Transit Bus Evaluation Project

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Contents

Overview

This report provides final results from New York City's Transit program's operation of 10 heavy duty hybrid diesel-electric transit bus prototypes.  The report includes fleet summary statistics for fleet operations and maintenance costs.  Emissions results are presented for buses tested in the study.   The study provides guidance for communities who are initiating a hybrid transit program including engaging the right stakeholders, determining operational baselines, evaluating options and determining feasibility, and developing goals.  Lessons learned are also presented, which can help communities avoid problems in their program development.

Community Information
Name New York City
Type City
Population 81,751,333[2]
Community Energy Goals 1. Reduce emissions, specifically oxides of nitrogen (NOx <15 g/mi) and particulate matter (PM <0.06 g/mi)

2. Significantly increase fuel economy 3. Show that the hybrid buses can operate in regular revenue service with no route or driver restrictions 4. Show that the hybrid bus performance (e.g., acceleration, gradability, and range) was equal to or better than that of conventional diesel buses and that drivers can switch from one to the other with no significant difference in operation 5. Demonstrate that drivers and passengers perceive hybrid-electric buses positively 6. Significantly increase brake life 7. Improve the design of the hybrid bus; promote the development of the technology through investment 8. Help put the industry in a position to build and sell “production” hybrid buses.

Baseline (NOx <15 g/mi) and particulate matter (PM <0.06 g/mi)
Results to Date All Goals were met or exceeded.

Highlights

This resource provides transportation professionals with quantitative, unbiased information on the cost, maintenance, operational, and emission characteristics of diesel hybrid-electric systems as one alternative to conventional diesel engines for heavy-duty transit bus applications.  This information benefits decision makers by providing a real-world account of the obstacles that were encountered and overcome and the lessons that were learned in adapting hybrid buses to a transit site previously geared toward conventional diesel buses.  The resource provides an overview of the program, a discussion of facilities, a description of the project start-up process, evaluation results of hybrid buses studied, lessons learned, and recommendations for future alternative fuel vehicle operations for New York City Transit.

Environmental Aspects

The goals of the study were to: 1. Reduce emissions, specifically oxides of nitrogen (NOx <15 g/mi) and particulate matter (PM <0.06 g/mi) 2. Significantly increase fuel economy 3. Show that the hybrid buses can operate in regular revenue service with no route or driver restrictions 4. Show that the hybrid bus performance (e.g., acceleration, gradability, and range) was equal to or better than that of conventional diesel buses and that drivers can switch from one to the other with no significant difference in operation 5. Demonstrate that drivers and passengers perceive hybrid-electric buses positively 6. Significantly increase brake life 7. Improve the design of the hybrid bus; promote the development of the technology through investment 8. Help put the industry in a position to build and sell “production” hybrid buses.  Study results indicate that all goals were achieved.



References

  1.  "New York City Transit Diesel Hybrid-Electric Buses Final Results: DOE/ NREL Transit Bus Evaluation Project"
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