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The important factor to develop test cycle

The important factor to develop test cycle. Prepared by Japan. 10 th DHC sub-group meeting under GRPE/WLTP informal group 11-12 October 2011 Brussels, Belgium. Driving energy.

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The important factor to develop test cycle

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  1. The important factor to develop test cycle Prepared by Japan 10th DHC sub-group meeting under GRPE/WLTP informal group 11-12 October 2011 Brussels, Belgium

  2. Driving energy ◆In general, there are relationship between Fuel consumption (L/km) and Driving energy (Wh/km=J/km). Driving energy can be calculated as follows; (*) Work [Nm=J] ＝ Force * Dist.,Power [J/s=W] = Work / time (*) Driving energy [J/km]＝Cum. Work [Wh] / Dist. [km] ◆When the road gradient is small, it is able to estimate cosθ≒1，sinθ≒θ/100 Speed and frequency Speed*Acceleration and frequency

  3. The important factor • The important factors are “speed”, “speed * acceleration” and “Time (frequency)”. • It means that “speed-acceleration distribution” and “speed frequency distribution” are important. • DHC methodology • speed-acceleration distribution (the least X2 ) • speed frequency distribution • “Average speed”, “acc./dec./cruise/idle ratio”, RPA and so on

  4. Summary • RPA (Dynamics) is one of important factor. However we should also consider other parameter / frequency distribution.

  5. One idea • We can modify test cycle which have dynamics based on original method. At least XX% etc..

  6. Relationship between Average speed and CO2 emission CO2 = a * V2 + b * V + c * V-1 + C WLTC Low WLTC Middle Curve on transient cycle CO2 [g/km] WLTC total WLTC Ex-high Dynamics +/- 10% NEDC WLTC High 20 40 60 80 100 Average speed [km/h]

  7. Cold / Hot ratio NEDC Cold Hot 1200 sec WLTC Cold Hot 1800 sec Cold/Hot ratio should be considered

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