電動輪驅(qū)動的電動車取消了傳統(tǒng)的機械差速器,在轉(zhuǎn)向時需要調(diào)節(jié)兩側(cè)的轉(zhuǎn)速來實現(xiàn)差速功能。
傳統(tǒng)車輛的左、右輪是通過機械式轉(zhuǎn)向梯形相連接的。一般良好路面上,左、右轉(zhuǎn)向輪驅(qū)動力產(chǎn)生的繞主銷的力矩大小基本相等,方向相反,因此相互抵消。
而電動輪驅(qū)動汽車由于各輪轉(zhuǎn)矩獨立可控,轉(zhuǎn)彎時左、右轉(zhuǎn)向輪的驅(qū)動力可以不相等,驅(qū)動力對主銷軸線的力矩將不再能互相抵消,也就是說驅(qū)動轉(zhuǎn)向力矩不再為零。由于兩轉(zhuǎn)向輪是通過轉(zhuǎn)向梯形相連接的,驅(qū)動轉(zhuǎn)向力矩將會驅(qū)動兩轉(zhuǎn)向輪轉(zhuǎn)向。
因此,對電動輪驅(qū)動的汽車,在保證直線行駛穩(wěn)定的同時,理論上按照一定規(guī)律,實時控制左、右轉(zhuǎn)向輪的輸出轉(zhuǎn)矩,將可以利用產(chǎn)生的驅(qū)動轉(zhuǎn)向力矩實現(xiàn)助力轉(zhuǎn)向的作用。
電動輪驅(qū)動技術(shù)是用四個或多個獨立控制的電動輪,來分別為車輛的車輪提供驅(qū)動轉(zhuǎn)矩。動力源與車輪之間沒有機械傳動環(huán)節(jié)。典型的電動輪結(jié)構(gòu)如圖7-1所示。
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