Question

When classifying a vehicle for the WLTP test cycle, which two specific vehicle performance metrics determine the required test cycle segments?

Accepted Answer

The two specific vehicle performance metrics used to determine the required WLTP test cycle segments are the power-to-mass ratio and the maximum speed. The power-to-mass ratio is the numerical result of dividing the vehicle&#x27;s rated engine power in kilowatts by its test mass in kilograms, expressed as watts per kilogram. This metric indicates how much acceleration capability a vehicle possesses relative to its weight. The maximum speed is the highest velocity the vehicle is technically capable of reaching, as declared by the manufacturer. These two metrics are used to classify vehicles into three distinct classes, which dictate the specific speed profiles and testing procedures applied. Class 1 vehicles are low-power vehicles with a low power-to-mass ratio, Class 2 vehicles are intermediate, and Class 3 vehicles are high-performance vehicles with a high power-to-mass ratio and a maximum speed exceeding 120 kilometers per hour. By measuring these two values, regulators ensure that the test cycle accurately represents the real-world driving conditions that each specific vehicle type is expected to encounter.

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When classifying a vehicle for the WLTP test cycle, which two specific vehicle performance metrics determine the required test cycle segments?