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В чем преимущество торможения двигателем? | 9-12-2013, 15:58

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В чем преимущество торможения двигателем?


Двигатель сконструирован и отрегулирован таким образом, что он всегда стремиться работать на минимальных оборотах (холостой ход). Нажимая на газ, водитель может заставить двигатель увеличить частоту вращения, но как только газ отпущен, обороты двигателя стремятся к минимуму. В результате, если автомобиль движется с включенной передачей, при отпускании газа двигатель замедляет автомобиль. Это называется торможение двигателем. Этот процесс очень удобен, так как часто позволяет управлять автомобилем только при помощи одной педали - педали газа. Добавляем газ - разгон, отпускаем - торможение. Интенсивность замедления на разных передачах разная. Это следствие закона передаточных чисел.

На 1-й передаче достигается минимальная скорость, но зато максимальная сила, поэтому именно на первой передачи возможно максимальное ускорение разгона и максимальное ускорение замедления (двигателю легко ускорять и замедлять автомобиль). На 4-й передаче достигаются максимальные скорости но минимальные ускорения (двигателю трудно воздействовать на автомобиль). Поэтому совершенно не зачем ждать полчаса, пока двигатель будет с трудом замедлять автомобиль на 4-й передаче, если можно пораньше включить 3-ю, и процесс пойдет быстрее, а затем 2-ю и процесс пойдет еще быстрее. В результате при торможении двигателем имеет смысл ждать, когда обороты опустятся до средних значений, и включать более низкую передачу. Дожидаться уменьшения оборотов до средних значений необходимо потому, что, во первых теперь уже водитель не заставит двигатель работать с чрезмерной частотой вращения после включения более низкой передачи и, во вторых, на малых оборотах усилие от двигателя заметно падает и соответственно, снижается эффективность торможения. При торможении двигателем с переключением передач по нисходящей водитель может каждый раз добавлять газ перед отпусканием сцепления, что позволит достичь максимальной плавности хода или отпускать сцепление без добавления газа, что даст большую интенсивность замедления. Во втором случае требуется особо аккуратно обращаться со сцеплением во избежании рывковых замедлений.

Торможение двигателем играет важную роль с точки зрения безопасности. Во-первых исключает возможность блокировки колес при торможении двигателем особенно ценно на скользкой дороге. Во-вторых торможение двигателем рекомендуется на затяжных спусках, когда длительное подтормаживание ножным тормозом может привести к перегреву и их отказу.
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