A06B-6093-H113 依據以上各模式工作范圍的劃分，滿足當前速度、加速度以及駕駛員需求的工作模式可能有多種。為提高經濟性，采用PSO優化各模式的系統效率，并根據當前行駛工況選擇效率的工作模式。據此，本文中制定基于PSO系統效率優化的雙電機耦合驅動系統控制策略，其框架如圖4所示�？刂撇呗允歉鶕斍肮r選擇效率工作模式，具體步驟如下：
（1）判斷滿足當前工況的工作模式的情況；若僅有一個適合的模式，則選擇該模式；若存在多個驅動模式，則進入系統效率優化控制模式；
（2）計算滿足當前工況的各個工作模式系統效率，其具體計算過程詳見1.2.2節；
（3）選擇系統效率最高的工作模式作為當前工作模式以提高整車經濟性。
圖4 基于粒子群算法的模式劃分及控制流程
2.2.1 TC模式下的系統效率優化
TC模式下，兩電機的轉速與車速成比例，兩電機的轉矩相耦合，可以在約束范圍內進行調節。采用粒子群優化算法優化兩電機的轉矩分配，以獲得系統效率。PSO算法初始參數和系統效率流程如圖5所示。TC模式系統效率優化過程為：給定速度和加速度，通過粒子群優化算法獲得電機M1、M2的目標轉矩，使系統效率ηTC達到。優化模型如下。
在SC模式下，兩電機的轉矩與驅動力矩成比例，兩電機的轉速相耦合，可以在約束范圍內調節。與TC模式類似，SC模式獲取系統效率關鍵是合理分配兩電機的轉速。同樣采用粒子群算法優化，具體求解過程與TC模式類似。圖8為SOC＝0.9時優化后不同模式下的系統效率。適合當前工況的驅動模式可通過比較該工況下4種驅動模式的系統效率而得出，即可以獲得4個工作模式的工作邊界，如圖9（a）所示。為減少計算量并提高整車控制器工作效率，提前劃分了各個工作模式的工作邊界，如圖9（b）所示。并將結果制成表格存儲在控制器中，通過查表獲得當前工作模式。
A06B-6093-H113
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