一提到双离合,网上可谓是一片吐槽之声扑面而来。争议性如此大的双离合,为何大众还是死抱着DSG不放手呢?而且相信留心观察的朋友都会发现一个怪像,就是尽管网上很多人都不喜欢且不推荐双离合,但在实际市场中,搭载大众双离合的车型都卖得不错。到底是什么原因造成这些消费者”口是心非”呢?
DSG(Direct Shift Gearbox)中文表面意思为”直接换挡变速器”也称为S-Tronic变速器或者双离合变速器(Double-clutch Gearbox),它特殊的地方在于它比别的变速器换档更快,传递的扭矩更大而且效率更高。但同时DSG变速器也有不足之处,比如与传统的自动变速箱相比,由于没有液力扭矩,又没有MT的半联动,所以当小排量发动机与DSG组合时,有时就会出现低速扭矩不足的现象,表现为起步时有轻微的抖动。
双离合变速箱又有干湿式的之分,目前市面上主要还是以湿式为主流。干湿式的区别在于湿式双离合多了一个油液浸泡,湿式则不会像干式那样出现过热现象。但是尽管如此,换挡逻辑混乱以及有顿挫感的问题依然存在。
说到为什么会有顿挫感,举个例子就会明白了:比如在城市用车时,堵车状况时常会出现,这个时候当车主紧急刹车时双离合则会认为你要减速了,于是就准备好了一档,结果尴尬的时刻来了,前方突然又畅通了,这时你需要立马加速,但这个时候双离合是预判了一档,于是便造成换挡的逻辑混乱,从而就导致顿挫的现象。
既然说到大众为何一直坚持用双离合,个人觉得原因有以下几点:
1、 大众是不想受爱信的限制,从而发展自己的变速箱技术。
2、 双离合容易造出来,研发成本、制造难度也相对比较低,并且专利费也是比较低的,还没人量产过。
3、 大众对于DSG的技术有信心,相信能攻克双离合的不足。
那么说,好的变速箱又该有那些特质呢?下面也来给大家例举几点:
第1、 平顺性,对于家用车而言,平顺性就莫过于是最重要的指标了。而所谓平顺性,就是看顿挫感有多低。毕竟开车出去买个菜都要前俯后仰的话,就相当难受了。
第2、 响应速度,开手动挡的老司机都知道,想要急加速的话,最好的做法就是降档补油。而对于自动变速箱来说也是如此,想要急加速时,一脚油门下去,变速箱就会一下子连降几挡的话,就证明此变速箱的响应速度较好。
第3、 可靠性,说到这一点时,可能很多人会觉得干湿双离合的可靠性就很差。其实可靠性这一点和变速箱的结构是没有太大关联的,更多的是取决于本身的用料,以及设计。
第4、 传动效率,一般来说,双离合的传动效率是最高的,最高能到达80%左右。也因此,大众的车型虽然在马力数据上来看并没有什么优势,但是谈及百公里加速时,就一点不输同级别车型。
总结:随着时代的发展,双离合变速箱的硬伤必然是会越来越少,以后也将会变得更加的完善。但是!同样是随着时代的发展,新能源日渐壮大的趋势,也不知传统变速箱的寿命还有多久了。未来,或许变速箱就要随着发动机一起消失了。
原创文章,作者:cesifu,如若转载,请注明出处:http://www.cesifu.com/article/5572.html
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