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WLTP-DTP-LabProcICE-167: PSA Proposal for Running Resistances Table

This document presents PSA's proposal for a table of running resistances used in the WLTP-DTP-LabProcICE-167 testing procedure. It includes information on the dyno setting, aerodynamics, mechanical losses, and tire rolling resistance. The document also evaluates the position of N1 vehicles and provides coefficients for calculating running resistances.

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WLTP-DTP-LabProcICE-167: PSA Proposal for Running Resistances Table

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  1. WLTP-DTP-LabProcICE-167 Table of running resistances – PSA proposal Bertrand MERCIER November 2012

  2. Using the table of running resistances • The table of running resistances is necessary for the multi-stage vehicles • These are N1 vehicles • Are M1 vehicles using this table ? • How is done the dyno setting ? • Set the dyno with 3 coefficients a, b and c • F = a + b v + c v² • a is a constant in N • b is in N/(km/h) • c is in N/(km/h)² • Put the vehicle on the dyno

  3. Proposed approach • The road load of the vehicle is due to several effects • Aerodynamic • Mechanical losses (Front and Rear) • Tires rolling resistance (Front and Rear) A C2 C1 B1 B2 Aerodynamic TIRE ROLL. REST. Mech. Loss.

  4. Proposed approach • On the dyno, the vehicle is submit to several forces • And the dyno is used to simulate • Aerodynamics • Rear tires rolling resistances (nondriving axle) • Rear axle mechanical losses (nondriving axle) C2 B2 Aerodynamic B1 Mech. Loss. A C1 TIRE ROLL. REST.

  5. Proposed approach C1 B1

  6. Proposed approach A • Aerodynamics • The coefficient c iscomming from aerodynamics(1/2 ρ SCx v²)

  7. Evaluation of the position of N1 vehicles • Evaluation of aerodynamics on several vehicles • 3 types of N1 vehicles (only vans) • F1 (Berlingo/Partner) • K1 (Jumpy/Expert) • K2/K3 (Jumper/Boxer) • For each type , 3 shapes : mini ; medium; maxi • For each type and shape : • The test mass , average of market distribution • The Aerodynamics, worst case on the vans

  8. Evaluation of the position of N1 vehicles • Positionning of the 9 « vehicles »

  9. Evaluation of the position of N1 vehicles • Positionning of the 9 « vehicles »

  10. Proposal for the a , b and c coefficients • F = a + b * v + c * v² • a coefficient • a = F(RRC) + F(Brake) in N • a = 0,06 * TM + 30 in N • Where TM is TMH or TML in kg • b coefficient • b = 0,1 in N/(km/h) • c coefficient • c = 1/2 ρ SCx in N/(km/h)² • c = 0,0922 + (-5,06E-05) * TM + (1,75E-08) * TM² in N/(km/h)² • Where TM is TMH or TML in kg

  11. Proposal for the a , b and c coefficients • Illustration • F = a + b * v + c * v²

  12. Conclusion • Proposal • To Use this new ‘table’ • To Apply a factor of 1,1 (10%) to insurethat the table wontbeused for commonvehicles • Issues • Is this table necessary for M1 vehicles ? • Needsome more datas for heavyervehicles • Opposite concavity

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