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Emission Test Cycles

China Light-Duty Vehicle Test Cycle (CLTC)

Time-speed data points: CLTC-P | CLTC-C

China light-duty vehicle test cycle (CLTC) is a part of the China automotive test cycle (CATC) developed by the China Automotive Technology & Research Center (CATARC) to replace European testing procedures for fuel/energy consumption and emissions. The CLTC is standardized by the national standard GB/T38146.1-2019, China Automotive Test Cycle Part 1: Light Vehicles, which defines two chassis dynamometer driving cycles, one for passenger cars and another for light commercial vehicles:

  • CLTC-P: China light-duty vehicle test cycle-passenger cars (乘用车行驶工况), and
  • CLTC-C: China light-duty vehicle test cycle-commercial vehicles (轻型商用车行驶工况)

The two test cycles are shown in the following figures. Each test includes three phases of (1) slow, (2) medium, and (3) fast driving.

[SVG image]
Figure 1. CLTC-P Cycle
[SVG image]
Figure 2. CLTC-C Cycle

Selected characteristics of the test cycles are listed in Table 1. The CLTC has a low average speed and frequent accelerations and decelerations. As a result, the CLTC’s fuel consumption is much higher than that of the NEDC and WLTC cycles [4984].

Table 1
Selected characteristics of CLTC-P and CLTC-C driving cycles
Total times18001800
Average speed (including stops)km/h28.9632.87
Average driving speed (excluding stops)km/h37.1841.25
Maximum speedkm/h114.0092.00
Average accelerationm/s20.450.47
Maximum accelerationm/s21.471.36
Average decelerationm/s2-0.49-0.48
Maximum decelerationm/s2-1.47-1.39