Abstract:

Real world fuel saving potential and pollutant emission were tested and analyzed for some typical
start-stop vehicles for 3 light duty vehicle (LDV) passenger cars. The fuel consumptions when start-stop
function ON and OFF were tested in lab and on road in different driving cycles. The results show that the fuel
savings potentials for every car tested both in lab and on road in two driving cycles representing China city
traffic conditions are better than that in New European Driving Cycle (NEDC) cycle. Real-world road tests data
in several cities in China comes to a same conclusion. The overall pollutants are comparable between startstop
function ON and OFF in the emission tests for LDV passenger cars in different driving cycles. Start-stop
off-cycle credit should be evaluated and granted by means of lab tests taking account of the traffic characters
and environment temperature in China while referring to US’s off-cycle/EU’s Eco-innovation test and evaluation
method. This approach is able to evaluate start-stop technology’s additional fuel saving in real world in China.

Key words: light duty vehicle, start-stop, fuel consumption, off-cycle, emission, on-road test