The utility model provides an automatic speed changing device for an electric vehicle, which belongs to the technical field of the electric vehicle speed control component. The utility model solves the problems of complex structure and poor adaptability in the prior art. The device comprises a controller and a battery of dual electric double speed motor, two speed motor control, including three-phase low-speed windings and three-phase winding speed, winding speed is less than the number of turns of three-phase three-phase low-speed winding turns, dual controller includes low speed winding control output port and high speed winding control outlet, three-phase low-speed winding is connected with the low speed winding control output in high speed high speed winding three-phase winding is connected with the control output, the battery is connected with the dual controller input, dual controller receives the output of the battery current signal when compared to less than the set value, the electric control double speed motor disconnect the three-phase low speed winding three-phase conduction speed winding; on the contrary, the conduction of three-phase low-speed windings and disconnect high speed three-phase winding. The utility model has the advantages of simple structure, and realizes the control of the variable speed driving of the electric vehicle to adapt to different road conditions.
【技术实现步骤摘要】
本技术属于电动车速控制部件
,涉及一种电动车自动变速装置。
技术介绍
电动车的驱动动力来源于电机。但是电机的扭矩变化范围较小,牵引力和转速不能适应在各种复杂阻力范围内变化要求。现有的电动车仅靠调节占空比来实现速度调节,占空比是高电平所占周期时间与整个周期时间的比值靠霍尔转把开环控制,当电动车在弱附着地面上起步,加速度或爬坡时驱动轮非常容易过度滑转,而导致车辆驱动性能、操作性能喝稳定性变差。启动瞬间靠大电流维持,对蓄电池和控制器冲击较大,下坡和滑行中反电动势控制器和电机自身冲击较大,控制器与电机的爬坡和长下坡过程中容易烧坏,不能满足复杂路况要求,需要频繁拧动转把与制动,造成蓄电池能量大量浪费,缩短了电动车的续航里程。同时,对控制器MOS管的冲击非常大,所以目前仅使用占空比来调速,制约了电动车在不同行驶路况下的应用,缩短了蓄电池、控制器、电机的使用寿命。且中国专利文件公开了申请号为200920176086.4的电动车自动变档装置,该装置通过电动机转动连接塔式转动齿轮,塔式转动齿轮与碟簧凸轮差动传动传感器连接,碟簧凸轮差动传动传感器与凸轮变速器ECU控制器连接,ECU控制器再与电机电信号连接,形成闭环控制。该技术方案一定程度上解决了常速电动车车速突然变化,驱动电机处于非稳态工况,引起电池突然大电流和深度放电,造成电机堵转发热,致使整车电起控制系统受损的问题,但该装置通过凸轮变速机构根据受力大小分别由传给塔式传动齿轮机构,由塔式传动齿轮机构接触不同速比实现变速信号,该装置通过机械结构进行变速信号的传输、结构复杂闭环控制执行受干扰和应变能力差。
技术实现思路
本 ...
【技术保护点】
一种电动车自动变速装置,包括用于给电动车提供驱动动力的电控双速电机、用于根据判断的路况对应控制电控双速电机输出的双路控制器和给电控双速电机与双路控制器提供电能的蓄电池,其特征在于,所述的电控双速电机包括三相低速绕组和三相高速绕组,所述三相高速绕组匝数少于三相低速绕组匝数,所述的双路控制器包括低速绕组控制输出口和高速绕组控制输出口,所述三相低速绕组连接低速绕组控制输出口,所述三相高速绕组连接高速绕组控制输出口,所述蓄电池连接双路控制器的输入口,所述双路控制器实时接收蓄电池的输出电流信号并比较判断出蓄电池输出电流小于设定值时,控制断开电控双速电机的三相低速绕组同时导通三相高速绕组;反之,双路控制器控制导通电控双速电机三相低速绕组同时断开三相高速绕组。
【技术特征摘要】
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