## 5 Result and Discussion
### Comparative Analysis  
From the program iteration chart, we can see the variation trend. The optimal scheme is the lowest cost, but in the actual situation, it is impossible to achieve the optimal configuration at once. The capacity of the yard and the charging infrastructure need to be expanded. In the process of gradually replacing fuel vehicles by pure electric buses, we need to pay attention to how costs change and what proportion of fuel vehicles should be replaced by pure electric buses, so we choose different vehicle ratios to discuss. The cost of different plans with different vehicle type proportions is shown in Table 7. Energy consumption cost one refers to the energy consumption cost of pure electric buses, and energy consumption cost two refers to the energy consumption cost of diesel buses and liquefied natural gas buses. The proportion of two types of buses of five different plans and the changes in costs in each case are shown in Table 7. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Bus Sequence Number** & **Vehicle Type** & **Bus Order Chain** \\ \hline
1 & V1 & 1041-682-429-759-934-38-882-47-893-1043 \\
2 & V1 & 1043-411-1046-839-771-128-865-1045 \\
3 & V3 & 1044-10-421-321-687-206-1047 \\
4 & V1 & 1046-966-868-1041-236-257-727-203-354-763-1044 \\
5 & V1 & 1042-326-163-1041-870-1043 \\
6 & V1 & 1042-925-1046-545-379-1045 \\
7 & V1 & 1042-511-1043-492-148-1046 \\
8 & V1 & 1047-791-516-157-730-765-582-1043 \\
9 & V3 & 1042-85-234-561-622-697-590-292-552-1041 \\
10 & V3 & 1045-136-653-662-917-838-577-584-1046 \\... &... &... \\
142 & V2 & 1043-650-747-372-908-595-949-1044 \\
143 & V3 & 1041-497-996-51-578-41-94-910-1047 \\
144 & V1 & 1041-25-263-422-1046-651-846-931-1035-599-1046 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Bus order chain. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & \multicolumn{3}{c}{**Number of Buses (Num)**} & \multicolumn{3}{c}{**Cost (Euro)**} & \multicolumn{3}{c}{**Number of**} \\ \cline{2-9}
**Plans** & \begin{tabular}{c} **Total Number** \\ **of Buses** \\ \end{tabular} & \begin{tabular}{c} **Number of** \\ **Electric Buses** \\ \end{tabular} & \begin{tabular}{c} **Number of** \\ **Feel Buses** \\ \end{tabular} & \begin{tabular}{c} **Energy Consumption** \\ **Cost1** \\ \end{tabular} & \begin{tabular}{c} **Energy Consumption** \\ **Cost2** \\ \end{tabular} & \begin{tabular}{c} **Passengers** \\ **Cost** \\ \end{tabular} & \begin{tabular}{c} **Total Cost** \\ \end{tabular} & \begin{tabular}{c} **Number of** \\ **Charge Times** \\ \end{tabular} \\ \hline \begin{tabular}{c} **Feel buses increase** \\ **by 20\%** \\ \end{tabular} & 132 & 59 & 73 & 2083 & 4860 & 1736 & 8679 & 46 \\ \hline \begin{tabular}{c} **Feel buses increase** \\ **by 10\%** \\ \end{tabular} & 138 & 70 & 68 & 2142 & 4553 & 1888 & 8583 & 58 \\ \hline \begin{tabular}{c} **The optimal plan** \\ \end{tabular} & 144 & 83 & 61 & 3187 & 3187 & 2082 & 8456 & 70 \\ \hline \begin{tabular}{c} **Feel buses decrease** \\ **by 10\%** \\ \end{tabular} & 150 & 95 & 55 & 3808 & 2539 & 2185 & 8533 & 82 \\ \hline \
\begin{tabular}{c} **Feel buses increase** \\ **by 20\%** \\ \end{tabular} & 158 & 111 & 47 & 4080 & 2197 & 2306 & 8583 & 96 \\ \hline
\begin{tabular}{c} **Only electric buses** \\ \end{tabular} & 205 & 205 & 0 & 6188 & 0 & 2238 & 8686 & 114 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: The cost of different vehicle type proportions. It can be concluded from the above table that:  
1. From the 1-3 columns of the table, we can see that in the process of pure electric buses replacing fuel vehicles, the total number of vehicles increases gradually. The proportion of the number of reducing fuel vehicles and increasing pure electric buses is about 1:2., because pure electric buses with similar passenger capacity need to return to the parking lot to recharge after reaching the limited mileage. Therefore, in practical application, it is necessary to replace one fuel vehicle with two pure electric vehicles. 2.