Aiming at reducing per person delay, this paper presents an optimization method for Transit Signal Priority (TSP) considering multirequest under connected vehicle environment, which is based on the travel time prediction model. Conventional arrival time of transit depended on the detection information and the front road state, which restricted the effect of priority seriously. According to the bidirectional and real-time information transmission under connected vehicle environment, this paper establishes a more accurate forecasting model of bus travel time. Based on minimizing the total person delay at the intersection, the decision mechanism of multirequest is devised to meet the priority needs of buses with different arrival times. And the green time compensation algorithm is developed after considering the arrival information of the buses in the next cycle of compensational phase. Finally, the paper combines the COM interface of VISSIM and Matlab to achieve the proposed method under connected vehicle environment. Four control methods were tested when the VCR was 0.5, 0.7, and 0.9. The results illustrated that the proposed method reduced per person delay by 18.57%, 11.88%, and 18.96% and decreased the private vehicle delay by 3.73%, 7.62%, and 13.10%, respectively.
Source of material Naproxen (0.015 mol, 3.45 g) was dissolved in anhydrous methylene chloride (12 mL), and then oxalyl chloride (0.018 mol, 1.7 mL) and two drops of N, N-dimethylformamide was dropwise added at 0°C. The solution was stirred overnight at room temperature. After the solvent and excess oxalyl chloride was removed by vacuum distillation, the residue was washed three times with dry toluene to obtain a yellow solid, naproxen acylchloride. Paeonol, 1-(2-hydroxy-4-methoxyphenyl)-ethanone (0.01 mol, 1.66 g) and 4-(dimethylamino)-pyridin (DMAP, 0.0015 mol, 0.18 g) were dissolved in dry tetrahydrofuran (20 mL) and triethylamine (0.015 mol, 2 mL). To the solution a solution of naproxen acylchloride in dry tetrahydrofuran was dropwise added at 0°C. The reaction mixture was stirred for 5 h at room temperature. The reaction mixture was filtrated to remove the solid and the filtrate was concentrated under vacuum to remove the solvent. The residue was dissolved in methylene chloride, successively washed with 5% NaHCO 3 solution and water to pH = 7, and dried with anhydrous Na 2 SO 4 . The solution was filtrated, and concentrated under vacuum to obtain crude product. The crude product was purified by recrystallization in ethyl acetate. The single crystals were obtained from methanol solution.
Experimental detailsAll the carbon-bounded H atoms were positioned geometrically with d(C-H) = 0.93-0.98 Å and U iso (H) = 1.2 or 1.5 U eq (C).
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