[Code of Federal Regulations]
[Title 40, Volume 17]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR86.336-79]

[Page 609]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 86_CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND 
ENGINES--Table of Contents
 
Subpart D_Emission Regulations for New Gasoline-Fueled and Diesel-Fueled 
           Heavy-Duty Engines; Gaseous Exhaust Test Procedures
 
Sec. 86.336-79  Diesel engine test cycle.

    (a) The following 13-mode cycle shall be followed in dynamometer 
operation tests of heavy-duty Diesel engines. Gasoline-fueled engines 
are covered in Sec. 86.335.

--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                        Observed    Time in mode (minutes)
                                                                                                         torque   --------------------------   Maximum
               Test Segment                          Mode No.                    Engine Speed         (percent of                             cumulative
                                                                                                        maximum      Minimum      Maximum        time
                                                                                                       observed)                              (minutes)
--------------------------------------------------------------------------------------------------------------------------------------------------------
1........................................  1...........................  Curb-idle..................  ...........          4.5          6.0  ...........
1........................................  2...........................  Intermediate...............            2          4.5          6.0  ...........
1........................................  3...........................  ......do...................           25          4.5          6.0  ...........
1........................................  4...........................  ......do...................           50          4.5          6.0           42
1........................................  5...........................  ......do...................           75          4.5          6.0  ...........
1........................................  6...........................  ......do...................          100          4.5          6.0  ...........
1........................................  7...........................  Curb-idle..................  ...........          4.5          6.0  ...........
2........................................  8...........................  Rated......................          100          4.5          6.0  ...........
2........................................  9...........................  ......do...................           75          4.5          6.0  ...........
2........................................  10..........................  ......do...................           50          4.5          6.0           36
2........................................  11..........................  ......do...................           25          4.5          6.0  ...........
2........................................  12..........................  ......do...................            2          4.5          6.0  ...........
2........................................  13..........................  Curb-idle..................  ...........          4.5          6.0  ...........
--------------------------------------------------------------------------------------------------------------------------------------------------------

    (b) During each mode the specified speed shall be held to within 50 
rpm. Torque for each mode must be held at the specified value 2 percent of the maximum torque observed. For example, 
mode 4 torque shall be held between 48 and 52 percent of maximum torque 
(50 2%).
    (c) If the operating conditions specified in paragraph (b) of this 
section for modes 3, 4, 5, 9, 10, and 11 cannot be maintained, the 
Administrator may authorize deviations from the specified load 
conditions. Such deviations shall not exceed 10 percent of the maximum 
torque at the test speed. The minimum deviations, above and below the 
specified load, necessary for stable operation shall be determined by 
the manufacturer and approved by the Administrator prior to the test 
run. Emission tests shall be performed at each of the approved load 
settings, one above and one below the operating conditions specified in 
paragraph (a) of this section. The emission values obtained shall be 
calculated in accordance with Sec. 86.345 except that the weighting 
factor shall be 0.04.
    (d) If the Administrator determines that an engine shall be tested 
as an automatic transmission code engine, then a load shall be applied 
by the dynamometer during the idle modes (1, 7, and 13) such that the 
engine speed is decreased from the recommended dynamometer-idle speed to 
the recommended curb-idle speed. The engine-idle torque recorded for the 
calculations in Sec. 86.345 shall be zero.