NEDC测试循环简介

NEDC测试循环

New European Driving Cycle

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NEDC测试循环

Note: The old European driving cycle ECE-15 driving cycle lies between the time period 0s to 800s. For the urban drive cycle the ECE-15 driving cycle is used, and for urban/sub-urban drive cycle the

New European Driving Cycle (NEDC) is used to simulate representative

driving conditions.

[edit] Criticism

The NEDC was constructed with old power-per-vehicle-mass and low maximum velocities. The transient velocities are much steeper in practice and more dynamic caused by the power surplus of modern turbocharged engines[1]. Also, the maximum cycle speed does not

represent the velocities currently seen on European trunk roads, dual carriageways and motorways, which often tend towards 160 km/h (100mph).

[edit] References

NEDC测试循环

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NEDC测试循环

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Time-speed data points: ECE | EUDC | EUDC (low power)

The ECE+EUDC test cycle is performed on a chassis

dynamometer. The cycle—also known as the MVEG-

A cycle—is used for emission certification of light

duty vehicles in Europe [EEC Directive 90/C81/01].

The entire cycle includes four ECE segments, Figure

1, repeated without interruption, followed by one

EUDC segment, Figure 2. Before the test, the

vehicle is allowed to soak for at least 6 hours at a

test temperature of 20-30°C. It is then started and

allowed to idle for 40s.

Effective year 2000, that idling period has been

eliminated, i.e., engine starts at 0s and the emission

sampling begins at the same time. This modified

cold-start procedure is also referred to as the New

European Driving Cycle or NEDC.

Emissions are sampled during the cycle according

the the “Constant Volume Sampling” technique,

analyzed, and expressed in g/km for each of the

pollutants.

NEDC测试循环

Figure 1. ECE 15 Cycle

The ECE cycle is an urban driving cycle, also known as UDC. It was devised to represent city driving conditions, e.g. in Paris or Rome. It is characterized by low vehicle speed, low engine load, and low exhaust gas temperature. The above urban driving cycle represents Type I test, as defined by the original ECE 15 emissions procedure. Type II test is a warmed-up idle tailpipe CO test conducted immediately after the fourth cycle of the Type I test. Type III test is a two-mode (idle and 50 km/h) chassis dynamometer procedure for crankcase emission determination.

Figure 2. EUDC Cycle

The EUDC (Extra Urban Driving Cycle) segment has been added after the fourth ECE cycle to account for more aggressive, high speed driving modes. The maximum speed of the EUDC cycle is 120 km/h. An alternative EUDC cycle for lowpowered vehicles has been also defined with a maximum speed limited to 90 km/h (Figure 3).

NEDC测试循环

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