Ремонтируем вместе: стучит форсунка на бензиновом двигателе

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Форсунка (инжектор) – это управляемый электронным блоком электромагнитный клапан, который дозирует подачу бензина в цилиндры двигателя. Есть форсунки для одноточечного (моновпрыска), а есть для впрыска распределенного (многоточечного). Электронный блок, который управляет работой форсунок, также несет ответственность и за работу всей системы впрыска. В данной статье мы попытаемся разобраться, отчего стучит форсунка на бензиновом двигателе и как решить эту проблему.

Сегодня многие автомобили оснащены инжекторными системами впрыска топлива, и оттого, в каком состоянии находятся форсунки, зависит работа двигателя в целом.

Инжекторная система в бензиновом моторе имеет явные, неоспоримые преимущества перед карбюраторами:

  1. точное дозирование бензина;
  2. экономия расхода топлива;
  3. большая приемистость автомобиля;
  4. меньшая токсичность выхлопных газов.

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Впрочем, есть одно «но» – форсунка, являющаяся основной исполнительной деталью, постоянно несет большие нагрузки, и если ее не обслуживать хотя бы раз в 3000 км пробега, деталь сильно засоряется, в следствие чего начинает «стучать». Звук этот весьма условно называют стуком, и правильнее было бы назвать его стрекотом, но уж так повелось у автомобилистов – если из-под капота раздается какой-то посторонний звук, то в подавляющем большинстве случаев говорят «стучит», какой бы детали автомобильного мотора это не касалось.

Устройство и принцип работы

Чтобы было удобнее и проще разобраться в причинах стука форсунок в бензиновом движке и в способах их устранения, для начала разберемся в устройстве и принципе работы инжекторной системы.

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Итак, к форсунке топливо подается под определенным давлением, которое зависит от режима работы двигателя:

  1. С блока управления на электромагнит форсунки поступают электрические импульсы, приводящие в действие игольчатый клапан.
  2. Клапан открывает и закрывает канал форсунки.
  3. Объем распыляемого бензина пропорционален продолжительности импульса, задает которую блок управления.

Важную роль в процессе образования горючей смеси играет направление, а также форма распыляемого факела, что, в свою очередь, зависит от расположения распылительных отверстий и их количества.

Маркировка, классификация и расположение форсунок

При центральном впрыске в общий впускной топливопровод горючее впрыскивает одна форсунка (в Хонде таких форсунок две), которая установлена перед дроссельной  заслонкой, как раз там, где в обычном бензиновом моторе стоит карбюратор. Характеризуется все это низким сопротивлением (до 4-5 Ом) обмотки электромагнита.

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При распределенном впрыске к каждому из цилиндров подведены отдельные впускные топливопроводы и форсунки, расположенные у их оснований, впрыскивают горючее в каждый цилиндр по отдельности. Сопротивление обмоток электромагнитов у этих форсунок доходит до 12-16 ОМ.

На некоторых автомобилях последней генерации бензин подается прямо в камеру сгорания. Форсунки в двигателе с системой непосредственного впрыска отличает высокое рабочее напряжение электромагнита (до 100 В). В маркировке таких форсунок обычно присутствует следующая информация:

  • наименование или каталожный номер;
  • фабричная марка или название;
  • номер серии.

Признаки неисправности форсунок и их причины

Как уже упоминалось в начале нашей статьи, от состояния форсунок зависит качество работы двигателя. Ниже мы перечислим основные признаки, того, что деталь стучит:

  • недостаточная мощность двигателя (автомобиль тупит);
  • при возрастании нагрузки появляются провалы и рывки;
  • неустойчивая работа мотора при низких оборотах;
  • выхлопные газы имеют повышенную токсичность.

Что же касается причин неисправности форсунок, то наиболее распространенной является их засорение.

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Форсунки в двигателе подвергаются воздействию высоких температур, поэтому подвержены закоксовыванию смолами, содержащимися в топливе (чаще это происходит при использовании низкокачественного бензина). Образующиеся на форсунках твердые отложения, частично или целиком перекрывают распылительные отверстия, нарушая тем самым герметичность игольчатого клапана. Также к засорению форсунок может привести общее загрязнение различных элементов топливной системы:

  • бензобак;
  • топливопроводы;
  • топливный фильтр и пр.

В этом случае фильтр форсунки и канал забивается частичками шлама.

Что делать?

Основной способ нормализовать работу форсунки, когда она стучит – это промывка. В процессе промывки накопившиеся загрязнения удаляются из системы. Наиболее распространенные способы промывки:

  • использование специальных присадок для топлива;
  • промывка системы без снятия форсунок при помощи специальной установки;
  • промывка на УЗ стенде (подразумевает снятие форсунок).

Промывка при помощи присадок к горючему – самый простой способ, заключающийся в периодическом добавлении в топливный бак специальных препаратов. Этот способ позволяет промыть как форсунки, так и всю топливную систему в двигателе.

Однако эффективен такой способ только при условии регулярного удаления небольших загрязнений (каждые 2-3 тысячи километров пробега) и относится, скорее, к мерам профилактики засоров топливной системы.

ВАЖНО! Нельзя удалять подобным методом застарелые отложения – это может привести к противоположному результату, поскольку смытый присадкой шлам в большом

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