The idling distribution characteristics of NEDC, WLTC and CLTC conditions were analyzed, and the exhaust emissions and fuel consumption of three light gasoline vehicles when the idling start-stop function was turned on and off under different cycle conditions were measured. The effects of idling start-stop function on light vehicle fuel consumption and emissions under different cycle conditions were analyzed. The results show that the vehicle fuel saving rate of the idling start-stop function in three cycle conditions is WLTC, NEDC and CLTC conditions from low to high. The idling start-stop function has little effect on vehicle gaseous pollutant emissions. On the whole, the the activation of idling start-stop function increases the THC and CO emissions and reduces NOx emissions.
In this paper, the engine-in-the-loop (EIL) method was used to study the fuel consumption and emission characteristics of heavy-duty trucks at China Automotive Test Cycle (CHTC-HT) and world transient vehicle cycle (C-WTVC) on an engine test bed. The result of the vehicle speed followability shows that the difference between the actual vehicle speed and the target vehicle speed is within ±2 km/h, indicating that the vehicle cycle can be well reproduced on the engine test bed by EIL method. The consistency results of fuel consumption and emissions indicate that the fuel consumption error is 0.89%, the NOx error is 1.02%, and the particle number (PN) error is 5.04%. For this vehicle, the fuel consumption per 100 kilometers at CHTC-HT is 21.33L, which is 2% higher than that of C-WTVC; while NOx emissions of CHTC-HT are 59.2% higher than that of C-WTVC. It is more difficult for enterprises to meet the fuel consumption and NOx emission standards under China Automotive Test Cycle.
Abstract. Load experiment (0%, 50%, 100% load) was carried out on a heavy duty diesel engine vehicle which meet EU/VI exhaust emission standard and the vehicle was drove on the heavy chassis dynamometer based on C-WTVC cycle. During the test period, the NO, NO 2 , N 2 O on the exhaust were analyzed by sophisticated measuring equipment. The results show that the NOx emission value on all 3 loads satisfy the EU/VI standard. As load rise up, the concentration of NO, NO 2 before/after Selective Catalytic Reduction system increase too. The NOx conversion efficiency under the 3 loads are 89%, 92%, 92% respectively. While the NO 2 concentration under the whole test cycle is low, the maximum can up to 19.5ppm under full load condition. The N 2 O concentration was effected by exhaust temperature and the load indirectly impacts the NO 2 concentration through the temperature. The concentration of N 2 O is positively related to load and driving condition, the N 2 O concentration increases when the load and speed rise up. During the 100% full load, the NO, NO 2 and N 2 O account of the total NO x is about 84.6%, 1.8% and 13.6% respectively.
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