http://img.miaomudu.com/2020/12/2020092744941汽车在高速行驶中突然松开油门踏板减速时,发动机仍在汽车惯性的带动下高速旋转。由于节气门已关闭,进入气缸的混合气数量很少,在高速运转下燃烧不完全,使废气中的有害排放物增多。减速断油控制就是当发动机在高转速运转中突然减速时,由电脑自动中断燃油喷射,直至发动机转速下降到设定的低转速时再恢复喷油。其是为了控制急|减速时有害物的排放,减少燃油消耗量,促使发动机转速尽快下降,有利于汽车减速。http://img.miaomudu.com/2020/12/2020092744941
http://img.miaomudu.com/2020/12/2020092744941减速断油控制过程是由电脑根据节气门位置、发动机转速、水温等运转参数,作出综合判断,在满足一定条件时,执行减速断油控制。http://img.miaomudu.com/2020/12/2020092744941
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这些条件是:http://img.miaomudu.com/2020/12/2020092744941
气门中的开关接通http://img.miaomudu.com/2020/12/2020092744941
发动机水温已达正常温度http://img.miaomudu.com/2020/12/2020092744941http://img.miaomudu.com/2020/12/2020092744941
发动机转速高于某一数值http://img.miaomudu.com/2020/12/2020092744941
http://img.miaomudu.com/2020/12/2020092744941该转速称为减速断油转速,其数值由电脑根据发动机水温、负荷等参数确定。http://img.miaomudu.com/2020/12/2020092744941
通常水温愈低,发动机负荷愈大(如使用空调时),该转速愈高。当上述三个条件都满足时,电脑就执行减速断油控制,切断喷油脉冲。上述条件只要有一个不满足(如发动机转速己下降至低于减速断油转速),电脑就立即停止执行减速断油,恢复喷油。http://img.miaomudu.com/2020/12/2020092744941http://img.miaomudu.com/2020/12/2020092744941
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3.溢油消除http://img.miaomudu.com/2020/12/2020092744941
http://img.miaomudu.com/2020/12/2020092744941起动时向发动机提供很浓的混合气。若多次转动起动马达后发动机仍末起动,淤集在气缸内的浓混合气可能会浸湿火花塞,使之不能跳火。这种情况称为溢油或淹缸。http://img.miaomudu.com/2020/12/2020092744941
此时驾驶员可将油门踏板踩到底,并转动点火开关,起动发动机。电脑在这种情况下会自动中断燃油喷射,以排除气缸中多余的燃油,使火花塞干燥。电脑只有在点火开关、发动机转速及节气门位置同时满足以下条件时,才能进人溢油消除状态:http://img.miaomudu.com/2020/12/2020092744941
点火开关处于起动位置。http://img.miaomudu.com/2020/12/2020092744941http://img.miaomudu.com/2020/12/2020092744941
发动机转速低于500转/分。http://img.miaomudu.com/2020/12/2020092744941http://img.miaomudu.com/2020/12/2020092744941
节气门全开。http://img.miaomudu.com/2020/12/2020092744941
http://img.miaomudu.com/2020/12/2020092744941因此,电子控制汽油发动机在起动时,不必踩下油门踏板,否则有可能因进入溢油消除状态而使发动机无法起动。http://img.miaomudu.com/2020/12/2020092744941http://img.miaomudu.com/2020/12/2020092744941
4.减扭矩断油控制http://img.miaomudu.com/2020/12/2020092744941
装有电子控制自动变速器的汽车在行驶中自动升档时,控制变速器的电脑会向汽油喷射系统的电脑发出减扭矩信号。汽油喷射系统的电脑在收到这一减扭矩信号时,会暂时中断个别气缸(如2、3缸)的喷油,以降低发动机转速,从而减轻换档冲击http://img.miaomudu.com/2020/12/2020092744941
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一般汽车多少转速会自动断油http://img.miaomudu.com/2020/12/2020092744941
普通发动机设计转速通常不会超过8000转/分。其实在转速表上一般都用红区标示发动机的危险转速,当指针进入红区后,发动机一般都会停止燃油喷射,如果是自动挡车型则会自动换挡车型,则会自动换挡以降低发动机转速。http://img.miaomudu.com/2020/12/2020092744941
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