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Emission Test Cycles

Petrol CUEDC & SPC240

Time-speed data points: Petrol CUEDC | SPC240

In 2005, a Composite Urban Emissions Drive Cycle (CUEDC) was developed for light duty petrol vehicles. This followed the development of CUEDC cycles for diesel vehicles in 1998.

The Petrol CUEDC was developed to be representative of “real world” Australian urban driving. It includes four segments—residential, arterial, freeway and congested—as shown in Figure 1.

Figure 1. Petrol CUEDC Cycle

A “Short Petrol CUEDC” (SPC240) was also developed, which attempts to represent the driving modes of the complete Petrol CUEDC in a shorter and potentially easier to perform test. The cycle was formulated based on the last 2 minutes of the arterial phase and the first 2 minutes of the freeway phase of the Petrol CUEDC (in an approach similar to that used in the formulation of the IM240 from the FTP-75).

Figure 2. SPC240 Cycle

Selected characteristics of the two cycles are compared in the following table.

Average Speedkm/h38.9546.57
Maximum Accelerationm/s23.613.61
Minimum Accelerationm/s2-2.78-2.22
% idle21.1%12.5%
% 1-24 km/h13.9%10.8%
% 25-40 km/h14.6%6.7%
% 41-65 km/h28.2%51.3%
% over 65 km/h22.3%18.8%