自动挡小汽车升挡和降挡是怎么回事

2025-03-15 20:13:16
推荐回答(1个)
回答1:

自动挡车是如何升档和降挡的?
大家都知道,一般情况下,转速达到2000转左右时,电脑就会控制升挡(当转速突然下降几百转时),这个升档转速是相对固定的。但只要改变一下加油节奏,就可以改变升档转速。比如,一台车子通常是在2200转升档,可以在转速上升到1800转左右时,突然松开油门,电脑就会在你松开油门后马上进行升挡控制。
想要开车时换挡转速低,当你松开油门时,电脑会认为负荷减小了,此时汽车不需要比较大的扭矩输出,于是就会控制提前升档,这样可以在同一车速的情况下,降低发动机的转速。大白话就是把转速控制在比较低的区间中,省油啊!
同样,也可以利用油门来提前降档。只要在汽车行驶的过程中,突然深踩一下油门(即使是踩下后马上松开,再慢慢的踩下油门),电脑也会立马控制降挡。同样的道理,突然深踩油门,电脑会认为此时负荷增加,汽车需要比较大的扭矩输出,所以就会采取降挡增扭的措施,以获得更好的加速性能。
比如超车的时候,可以先深踩一下油门后松开,让变速器更快速的降挡,这样加速性更好,也更安全。
那如何知道是升档和降挡呢?
一般看转速表,开熟的老司机自然会明白。举例:现在时速100,正常巡航变速箱都在最高挡,发动机转速大约2000转,那么超车深踩油门发动机转速3000转,时速120,这时变速箱降挡了,那么如果油门踩的更深转速直飙4000或者更高,时速也迅速上来这时变速箱连降两档了。平时开车加速过程中,转速表指针2000转一回落,然后2000转又一回落就是在加档了。

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