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苦逼热狗

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  • 如果我每次以下情况

    接近红灯
    变黄灯的时候
    前面是停滞路口

    最近养成的习惯,踩刹车减速,然后切为neutral档,滑着到线,这个是坏习惯吗
    是安全性不好呢?还是对发动机不好?

    因为国内开车一般都直接挂到空档然后踩点刹车滑着到线

    有朋友告诉过我说安全性不好,怕后头有车撞到了,有点动力有帮助
     

    hcloud

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    自动挡车放空挡停车都没什么好处。
    http://askville.amazon.com/put-auto...g-save-gas/AnswerViewer.do?requestId=15093108
    Answer from TheLightWorks
    2 people found this helpful
    mechanically, you are okay.


    putting the automatic transmission in neutral with the engine running disengages the geartrain, like depressing the clutch pedal on a manual transmission. - note that with modern automatic transmissions, the engine must be running to keep the transmission fluid circulating; which lubricates the geartrain.

    however, my state and probably many others, prohibit the practice of coasting down hills with the transmission in neutral. the logic behind this is that first, the engine helps with braking on downgrades, and reduces heat and wear in the brakes - critical in heavy vehicles. second, if the transmission is disengaged, then the transmission will have to be reengaged before the driver can accelerate to avoid trouble.
    TheLightWorks 59 months ago

    Answer from Schelli
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    It is not a good thing for a few reasons


    1) it is illegal in most states
    2) It takes some control away from the car, especially when you're on a surface that is not dry
    3) It's possible to forget you're in nuetral and either slide it into park or race the engine thinking you're in drive
    4) the engine braking effect actually helps you maintain control and have less wear and tear on the brakes
    5) you have no control over the car in an emergency
    6) the car is still turning over at idle, and coming down the hill with your transmission engaged, the car is still in idle - you're not saving as much as you think
    7) the rear seal of the transmission is not being properly lubricated when you're in idle and the drive shaft is engaged. This is one of the reasons a rear wheel drive vehicle should not be towed great distances.

    All in all, your friend is correct. Just let the engine idle as you come to a traffic control device that requires you to stop.
     

    水晶瓶子

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    我个人认为不好。 可以考虑在等灯的时候放空挡,但是如果还在滑行最好别换空,纯属个人意见,仅供参考
     

    笨妈笨爸

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    你正常刹车不可以吗?好奇,这样做是为了什么?省刹车片?
     

    zeus190

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    由于没有引擎的阻力,这样更费刹车片.
    就算是手动档也推荐逐步降档使用引擎刹车.
    如果是自动档的话纯属多此一举, 有突发事件时将大大增加反应时间.
     

    cfcplayer

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    毫无必要, 也没啥好处.
     

    哈哈哈镜

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    换手动的吧
     

    月下独酌

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    通常transmission oil pump是连接在input shaft上的
    Neutral = no oil pressure.

    而且后面如果有人冲过来你来不及,木有power躲开

    你没事儿干换来换去的不怕把变速箱换坏掉么
     

    笨妈笨爸

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    好奇,借贴问一下,那个Neutral是干什么用的?
     

    笨妈笨爸

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    车要被拖走的时候...
    仅仅是这一个用处?我记得还有一个就是,油门踩下去了提不上来时或者刹车失灵时,应该尽量把控制放到N档。
     

    zeus190

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    仅仅是这一个用处?我记得还有一个就是,油门踩下去了提不上来时或者刹车失灵时,应该尽量把控制放到N档。

    对. 我记得学车时教练一需要我紧急停下就是N+刹车, 以防我还在踩油门.
     

    mianfei

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    自动档车挂空挡后:
    1、机油泵停止工作,马上无润滑,发动机急剧磨损至烧坏;
    2、助动转向可能停止工作(根据车型不同),转向困难;
    3、助动刹车可能停止工作(根据车型不同),刹车困难
    空挡是近距离拖车(都不可靠,因为润滑关系)如进入有自动导轨的洗车房,或行驶中意外熄火后的点火发动:你总不至于把80Km/H的车直接挂P档点火吧。
     

    mianfei

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    仅仅是这一个用处?我记得还有一个就是,油门踩下去了提不上来时或者刹车失灵时,应该尽量把控制放到N档。
    油门踩下去了提不上来时或者刹车失灵时,应熄火!
     

    月下独酌

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    还有一个

    挂着档滑行,轮子带着发动机转的时候不会喷油/点火,耗油量是0

    空档发动机就自己idle了,而且往往为了带动power steering跟提供brake vacuum, 怠速还会更高一些
     
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