SAE J2572_202402

This SAE Recommended Practice establishes uniform procedures for testing fuel cell and hybrid fuel cell electric vehicles, excluding low speed vehicles, designed primarily for operation on the public streets, roads and highways. The procedure addresses those vehicles under test using compressed hydrogen gas supplied by an off-board source or stored and supplied as a compressed gas onboard. This practice provides standard tests that will allow for determination of fuel consumption and range based on the US Federal Emission Test Procedures, using the Urban Dynamometer Driving Schedule (UDDS) and the Highway Fuel Economy Driving Schedule (HFEDS). Chassis dynamometer test procedures are specified in this document to eliminate the test-to-test variations inherent with track testing, and to adhere to standard industry practice for fuel consumption and range testing. Communication between vehicle manufacturer and the governing authority is essential when starting official manufacturer in-house and official government confirmatory testing that incorporates this practice. This document is being stabilized to incorporate changes reflecting progress both the fuel cell and automotive industries have made in the extending the range and improving the fuel consumption of their latest generation of compressed hydrogen gas fueled light duty vehicles. SAE J1711 has supplanted SAE J2572 as the SAE Recommended Practice used to calculate emissions and fuel economy for this class of vehicles. SAE J2572 provided procedures for measuring fuel consumption, emissions, and range using only two major test cycle procedures (UDDS and HFEDS) based on the U.S. Federal Emission Test Procedures. SAE J1711 uses an expanded testing process to include all five recognized test cycle procedures (UDDS, HFEDS, US06, SC03, and cold FTP). Because of this expanded test process, SAE J1711 is the current industry preferred document for the purpose of measuring fuel consumption and range across a broader range of test scenarios.