Engine-Based Certification
The NAVC Hybrid Transit Bus Certification Workgroup set out to
analyze in-use hybrid engine data in order to determine the most
representative existing engine cycle for certifying hybrid engines.
The Workgroup gathered hybrid engine operating data collected during
actual bus operation to compare to various established test cycles.
The conclusion was that hybrid engines will be more closely characterized
by steady-state cycle, with the Euro II cycle being the most representative
of hybrid use. The Euro III is widely recognized by engine manufacturers
and regulators, therefore allowing for an easy and quick implementation
of a special test procedure in the near term to serve as an interim
engine certification procedure for engines in hybrid-electric urban
buses.
The WorkgroupÕs analysis and conclusions are discussed in detail
in a September, 2000 report entitled "Engine Certification Recommendations
Report." The report is available from the NAVC (see below).
Chassis Testing
The Workgroup is also working on chassis testing for heavy-duty
hybrids. The Workgroup agreed that it would be beneficial to industry
and regulators to have a chassis testing standard developed. To
that end, the group has been working with the Society of Automotive
Engineers (SAE) to develop a recommended practice for heavy duty
hybrid chassis testing. The Workgroup hopes to have a recommended
practice issued in early 2002.
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