
                                          
                                                                   May 16, 2011
                                          
                             Proposed GHG/FE Rule
                                          
                          Hybrid Certification Issues


      To make hybrid certification more representative of real-world operation of hybrid vehicles, and to ensure a fair evaluation regardless of test procedure selected, EMA/TMA requests the following modifications to the proposed GHG/FE rule: 
      
1)          For hybrid engine dynamometer evaluation: Limit available tractive effort based on the vehicle FTP cycle to ensure that available hybrid tractive effort matches real world operation.  See, Appendix A and C.
            
2)          For chassis dynamometer and simulated chassis dynamometer: Modify the cycle weightings for hybrid vocational vehicles without PTO to better match real-world operation, and to provide an equivalent hybrid benefit as compared to the hybrid engine evaluation (align potential benefits with vehicle FTP cycle).  See, Appendix A.

                                  VOCATIONAL
                                   WEIGHTING
                                      PTO
                                   TRANSIENT
                                 55mph CRUISE
                                 65 mph CRUISE
                                       
                                   Proposed
                                      0%
                                      42%
                                      21%
                                      37%
                                       
                                   Modified
                                      0%
                                      75%
                                      9%
                                      16%

3)           For chassis dynamometer and simulated chassis dynamometer: Modify the cycle weightings for hybrid vocational vehicles with PTO to better match real-world operation, and to provide an equivalent hybrid benefit as compared to the hybrid engine evaluation.  See, Appendix B.
      
                                PTO- VOCATIONAL
                                   WEIGHTING
                                      PTO
                                   TRANSIENT
                                 55mph CRUISE
                                 65 mph CRUISE
                                       
                                   Proposed
                                      28%
                                      30%
                                      15%
                                      27%
                                       
                                   Modified
                                      45%
                                      50%
                                      5%
                                      0%
      
      
      
      
      
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