一台正常的发动机,它的发动机转速是无法改变的,发动机的转速、档位、车速,三者之间的关系是固定的,除非换车,没有别的办法!转速异常增高的话,多数源于车辆故障,例如常见的手动档离合器打滑,自动档是液力变矩器故障等,这个需要专业检测!
好多朋友都有一个疑问,特别是刚买新车的,新车提出来一直都在市区使用,偶尔一天突然跑一趟高速,发现达到一定速度时,转速好高啊,他们会认为车子发动机转速高,是操作不规范引起的,其实并不是这样子,发动机转速与车速之间的关系,是由传动比决定的,不是您操作的问题!
在发动机产品铭牌上,都有规定的有效功率,和其相应的转速,分别称为标定功率和标定转速,发动机在标定功率,和标定转速下的工作状况称作标定工况,这个标定工况是无法改变的,也不是人为控制的,如果是手动档车型,高速工况使用最高档转速就会更低,特别是现在的某些车型,都是6速手动变速器,也有人从来不使用6档,跑高速转速自然会高了。
发动机高速工况下,转速的高低,虽然不能直接衡量一台车的好坏,但是高转速下车辆噪音会增大,直接影响驾驶心情,例如120km/h的状态下,有些车子能达到4000转转速,而有些车子只有2000多转,体验肯定是不同的!
如何根据发动机转速来判断汽车的故障
转速反映的是发动机的工作状态,如果转速不稳,忽高忽低,那一定是发动机出故障了。还有就是发动机的转速与车速不匹配。这种情况一般车主是发现不了的,在修理人员检查故障时却经常用到。
(1)汽车失速试验
失速试验是检查自动变速箱故障的一种方法。具体做法是拉上手刹车,踩住刹车,变速箱挂在“D”档位置,然后缓慢的踩下油门,观察发动机转速。当油门踩到底时,发动机转速一般不会超过2600转。如果显示的转速过高,就说明变速箱内部磨损严重,需要检修变速箱了。
(2)变矩器锁止离合器测试
如果一辆自动变速箱车型,油耗突然升高,行驶中发动机转速很高而车速不高,做失速试验又没有问题,这时就要怀疑变矩器锁止离合器故障了。如果它没有锁止,在汽车行驶时,发动机与变速箱不是刚性连接,二者之间有很大的转速差,汽车自然就油耗高了。
(3)手动变速箱车型离合器磨损检查
对于手动变速箱的车型来说,可以根据发动机转速与车速的关系,来看离合器是否打滑。比如说某车在发动机转速2000转时车速是60公里/小时,如果此时的车速只有50公里/小时,就说明离合器打滑了,需要检修离合器了。
汽车发动机的转速越低,证明发动机的性能越好?真的是这吗?
首先,一般汽车的怠速值在500至850转之间,而冷车启动瞬间怠速可达1500到2000转/分左右,等发动机水温恢复到90度后,怠速也就保持在规定的稳定值内。
并不是发动机转速越快,汽车的车速就越快,还跟当时的档位相关。也就是变速箱的速比( 速比(speed ratio指汽车驱动桥中主减速器的齿轮传动比,它等于传动轴的旋转角速度比上车桥半轴的旋转角速度,也等于它们的转速之比。)比如同样的转速2000转,那1档和3档对应的车速肯定是不一样的,一般来说在低档位的时候,发动机转速教快,牵引力强同时车费油,在高档位的时候,发动机转速较慢,牵引力没有在低档位时那么弱,在空挡时,发动机的动力就给不到传动装置了。
车速并不是与发动机的转速成正比的,而是由变速箱决定的,老司机给了一个发动机转速和车速的换算公式:车速=建议机转速X变速箱其时速比X车轮周长,大家感兴趣可以了解一下。
这说明,汽车在高速行驶的情况下,发动机的低转速并不是恒定发动机好坏的唯一标准,虽然低转速能带来较低的油耗,但是一个好的发动机,评判的标准有许多,比如故障率就是一个重要的因素,另外一个好的发动机,应该与之匹配一个好的变速箱,才来使汽车开起来更加舒适。
但是100KM/H的发动机转速也是很多车主喜欢与别人谈论的事情。快来评论区晒晒你的100km发动机转速吧
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