Vehicle-specific power

<p>The concept of vehicle-specific power (VSP) is a formalism used in the evaluation of <a href="/facts/Exhaust_gas/kLpq1eUX">vehicle emissions</a>. The idea was first developed by J. L. Jiménez (Jiménez 1998) at the <a href="/facts/Massachusetts_Institute_of_Technology/Xk49vNA8">Massachusetts Institute of Technology</a>. Informally, it is the sum of the loads resulting from <a href="/facts/Aerodynamic_drag/vdl4jF7I">aerodynamic drag</a>, acceleration, <a href="/facts/Rolling_resistance/nrvwxcHy">rolling resistance</a>, and hill climbing, all divided by the mass of the vehicle. Conventionally, it is reported in <a href="/facts/Kilowatt/VK8oqRrm">kilowatts</a> per <a href="/facts/Tonne/gMymLmWv">tonne</a>, the <a href="/facts/Power_(physics)/mkaEyRnn">instantaneous power</a> demand of the vehicle divided by its mass. VSP, combined with <a href="/facts/Dynamometer/IcDW7VUg">dynamometer</a> and remote-sensing measurements, can be used to determine vehicle emissions.
</p><p>The <a href="/facts/United_States_Environmental_Protection_Agency/ghI985SI">United States Environmental Protection Agency</a> held a "modelling shootout" in 2001, to help with the development of its (then) new MOVES (motor vehicle emissions simulator) vehicle emissions model. Two of the four modelling metholodogies in the shootout, one from <a href="/facts/North_Carolina_State_University/FnMUAASu">North Carolina State University</a> (Frey 2002) and one internal to the EPA, used vehicle-specific power metrics. MOVES was eventually implemented using vehicle-specific power as its primary metric. (See Koupal et al. 2002, § 7.1.3.1 for the EPA MOVES draft VSP specification.)
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Vehicle-specific power open-in-new

Vehicle-specific power