IS 14785 : 2000 Automotive Vehicles - Determination of Road-load Constants by Coast Down Test Method

1 Scope

1.1 This standard specifies the procedure for determining theequation of road-load resistance of vehicle, including theaerodynamic and rolling resistance by coast down technique. Thisdata is primarily intended for the road-load simulation on variableload curve chassis dynamometer.

This equation is expressed as F = a + bv², wherefactors a and b are the constants.

1.2 However, it may be borne in mind that use of each of theseconstants independently may not be accurate. For example, thecoefficient of rolling resistance `a' will not be accurate enoughto use as a comparison of rolling resistance of tyre.

2 References

IS 9211 : 1979Denomination and definitions of weights of road vehicles

IS 11422 : 1986Terms and definitions of weights of two wheeled motorvehicles