The FTP-75 (Federal Test Procedure) has been used for emission certification of light duty vehicles in the U.S. Effective model year 2000, vehicles have to be additionally tested on two Supplemental Federal Test Procedures (SFTP) designed to address shortcomings with the FTP-75 in the representation of (1) aggressive, high speed driving (US06), and (2) the use of air conditioning (SC03).
The FTP-75 cycle is derived from the FTP-72 cycle by adding a third phase of 505s, identical to the first phase of FTP-72 but with a hot start. The third phase starts after the engine is stopped for 10 minutes. Thus, the entire FTP-75 cycle consists of the following segments:
- cold start phase
- transient phase
- hot start phase.
The following are basic parameters of the cycle:
- Distance traveled: 11.04 miles (17.77 km)
- Duration: 1874s
- Average speed: 21.2 mph (34.1 km/h).
Figure 1. FTP-75 Cycle
The emissions from each phase are collected in a separate teflon bag, analyzed and expressed in g/mile (g/km). The weighting factors are 0.43 for the cold start, 1.0 for the transient phase and 0.57 for the hot start phase.
The FTP-75 cycle is known in Australia as the ADR 37 (Australian Design Rules) cycle.