Title 40: Protection of Environment
PART 86—CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND ENGINES (CONTINUED)
Subpart T—Manufacturer-Run In-Use Testing Program for Heavy-Duty Diesel Engines
Browse Previous | Browse Next
Appendix V to Part 86—The Standard Road Cycle (SRC)
1. The standard road cycle (SRC) is a mileage accumulation cycle that may be used for any vehicle which is covered by the applicability provisions of §86.1801. The vehicle may be run on a track or on a mileage accumulation dynamometer.
2. The cycle consists of 7 laps of a 3.7 mile course. The length of the lap may be changed to accommodate the length of the service-accumulation track.
| Lap | Description | Typical accel rate
(MPH/s) |
|---|
| 1 | (start engine) Idle 10 sec | 0 |
| 1 | Mod accel to 30 MPH | 4 |
| 1 | Cruise at 30 MPH for
1/4 lap | 0 |
| 1 | Mod. decel to 20 MPH | −5 |
| 1 | Mod accel to 30 MPH | 4 |
| 1 | Cruise at 30 MPH for
1/4 lap | 0 |
| 1 | Mod. decel to stop | −5 |
| 1 | Idle 5 sec | 0 |
| 1 | Mod accel to 35 MPH | 4 |
| 1 | Cruise at 35 MPH for
1/4 lap | 0 |
| 1 | Mod. decel to 25 MPH | −5 |
| 1 | Mod accel to 35 MPH | 4 |
| 1 | Cruise at 35 MPH for
1/4 lap | 0 |
| 1 | Mod. decel to stop | −5 |
| 2 | Idle 10 sec | 0 |
| 2 | Mod accel to 40 MPH | 3 |
| 2 | Cruise at 40 MPH for
1/4 lap | 0 |
| 2 | Mod. decel to 30 MPH | −5 |
| 2 | Mod accel to 40 MPH | 3 |
| 2 | Cruise at 40 MPH for
1/4 lap | 0 |
| 2 | Mod. decel to stop | −5 |
| 2 | Idle 5 sec | 0 |
| 2 | Mod accel to 45 MPH | 3 |
| 2 | Cruise at 45 MPH for
1/4 lap | 0 |
| 2 | Mod. decel to 35 MPH | −5 |
| 2 | Mod accel to 45 MPH | 3 |
| 2 | Cruise at 45 MPH for
1/4> lap | 0 |
| 2 | Mod. decel to stop | −5 |
| 3 | Idle 10 sec | 0 |
| 3 | Hard accel to 55 MPH | 4 |
| 3 | Cruise at 55 MPH for
1/4 lap | 0 |
| 3 | Mod. decel to 45 MPH | −5 |
| 3 | Mod accel to 55 MPH | 2 |
| 3 | Cruise at 55 MPH for
1/4 lap | 0 |
| 3 | Mod. decel to 45 MPH | −5 |
| 3 | Mod accel to 60 MPH | 2 |
| 3 | Cruise at 60 MPH for
1/4 lap | 0 |
| 3 | Mod. decel to 50 MPH | −5 |
| 3 | Mod. accel to 60 MPH | 2 |
| 3 | Cruise at 60 MPH for
1/4 lap | 0 |
| 3 | Mod. decel to stop | −4 |
| 4 | Idle 10 sec | 0 |
| 4 | Hard accel to 80 MPH | 3 |
| 4 | Coastdown to 70 MPH | −1 |
| 4 | Cruise at 70 MPH for
1/2 Lap | 0 |
| 4 | Mod. decel to 50 MPH | −3 |
| 4 | Mod accel to 65 MPH | 2 |
| 4 | Cruise at 65 MPH for
1/2 lap | 0 |
| 4 | Mod. decel to 50 MPH | −3 |
| 5 | Mod accel to 75 MPH | 1 |
| 5 | Cruise at 75 MPH for
1/2 lap | 0 |
| 5 | Mod. decel to 50 MPH | −3 |
| 5 | Lt. accel to 70 MPH | 1 |
| 5 | Cruise at 70 MPH for
1/2 lap | 0 |
| 5 | Mod. decel 50 MPH | −3 |
| 6 | Mod accel to 70 MPH | 2 |
| 6 | Coastdown to 60 MPH | −1 |
| 6 | Cruise at 60 MPH for
1/2 lap | 0 |
| 6 | Mod. decel to 50 MPH | −4 |
| 6 | Mod. accel to 65 MPH | 1 |
| 6 | Cruise at 65 MPH for
1/2 lap | 0 |
| 6 | Mod. decel to stop | −4 |
| 7 | Idle 45 sec | 0 |
| 7 | Hard accel to 55 MPH | 4 |
| 7 | Cruise at 55 MPH for
1/4 lap | 0 |
| 7 | Mod. decel to 40 MPH | −5 |
| 7 | Mod. accel to 55 MPH | 2 |
| 7 | Cruise at 55 MPH for
1/4 lap | 0 |
| 7 | Mod. decel to 40 MPH | −5 |
| 7 | Mod. accel to 50 MPH | 2 |
| 7 | Cruise at 50 MPH for
1/4 lap | 0 |
| 7 | Mod. decel to 40 MPH | −5 |
| 7 | Mod. accel to 50 MPH | 2 |
| 7 | Cruise at 50 MPH for
1/4 lap | 0 |
| 7 | Mod. decel to stop | −5 |
The standard road cycle is represented graphically in the following figure:
View or download PDF[71 FR 2837, Jan. 17, 2006]
