
За Low pressure EGR ли говориш, за High pressure EGR или за хибриден EGR?
group® написа:Дай да почнем отначало - ЕГР кога работи и доколко пречи за наличие на кислород в изгорелите газове при около 2000 оборота и 130км/час на загрял двигател?
Колата е ЕА288 2.0 тди , не го знам какъв е точно , но ще разбераgroup® написа:Сега пък трябва да задам друг въпрос![]()
За Low pressure EGR ли говориш, за High pressure EGR или за хибриден EGR?
bayspiro написа: Добавянето на нафта в такта на изпускането без необходимото количество излишен кислород в пушека (резултат от действието на ЕГР-а) не води до изгаряне на саждите, точно обратното - сместа става още по -богата на въглеводороди и резултата е много СО и нови сажди поради непълното горене.
samo_pechka написа: Колата е ЕА288 2.0 тди , не го знам какъв е точно , но ще разбера
Кайзен написа:1.6 i-DTEC в Honda Civic 10 покрива Euro 6d temp без Adblue.Kiofre написа:Въпросът ми е дали в някои двигатели се постигат последните еко изисквания без допълнителен консуматив.
group® написа:bayspiro написа: Добавянето на нафта в такта на изпускането без необходимото количество излишен кислород в пушека (резултат от действието на ЕГР-а) не води до изгаряне на саждите, точно обратното - сместа става още по -богата на въглеводороди и резултата е много СО и нови сажди поради непълното горене.
Какъв егр те гони (в твоя стил), по време на регенерация?
Някой изобщо следил ли е работата на егр-ът си? (Ама и да знае какъв му е точно)
Иначе и за теб се отнася по-горния ми въпрос?
bayspiro написа: В пушека няма достатъчно кислород - изгаряне йок!
Това не е съвсем така. Биодизела има склонността да абсорбира повече влага/водни пари и попадайки в картера да "увреди" маслото в по-голяма степен. Маслото си се "разваля" и от дизел без биосъставка. От друга страна дизелово гориво без биосъставка би увредило помпата и дюзите. Именно биосъставката играе "ролята" на смазващ конпонент в модерните горива с ниско съдържание на сяра.group® написа:Иначе, може да е полезно да се знае, че високото съдържание на биодизел води до повишено навлизане на гориво в маслото, защото няма тази склонност към изпаряване при пост инжектиране.
Volkswagen tests using B5 and post-injection showed 45 percent oil dilution after 10,000 miles, but surprisingly no engine damage was evident upon inspection. "Using B10 at 10,000 miles surpasses that 50 percent threshold-and that is unacceptable," Johnson said. "We want longer oil change intervals as a car company, so it's hard for us to talk about this." The implications are that increased fuel dilution due to biodiesel blends could lead to premature engine wear if oil changes are not done more often.
Senior technical advisor for Cummins Inc., Howard Fang, explains to Biodiesel Magazine exactly how this inordinate accumulation of biodiesel in the crankcase oil takes place.
Cummins has done extensive work to characterize biodiesel's effects on engines, performance and exhaust. "Biodiesel definitely promotes fuel dilution," Fang says.
Post-injection of fuel into the cylinders is intended to vaporize in the cylinder but not combust, exiting then through the exhaust valves and traveling downstream where the introduction of the unburned fuel to the catalyst creates an exothermic reaction incinerating the collected soot. Inevitably the heavier fractions of fuel will not vaporize during post-injection and in liquid form can adhere to the cylinder walls. Through the slapping motion of the pistons and oil rings, the unburned fuel from post-injection can make its way through the tight, hot quarters between the piston, rings and cylinder walls. The fuel accumulates in the crankcase and dilutes the oil, which is a major concern regarding engine wear and longevity.
"Using post-injection you will generally see elevated levels of fuel dilution regardless of what fuel you're using," Sappok says. Because biodiesel has a higher distillation temperature and boiling point, when it's present in the post-injected fuel it tends to dilute the oil on a level disproportionate to its blend ratio in the fuel. Fang says this is just now becoming understood.
group® написа:Volkswagen tests using B5 and post-injection showed 45 percent oil dilution after 10,000 miles, but surprisingly no engine damage was evident upon inspection. "Using B10 at 10,000 miles surpasses that 50 percent threshold-and that is unacceptable," Johnson said. "We want longer oil change intervals as a car company, so it's hard for us to talk about this." The implications are that increased fuel dilution due to biodiesel blends could lead to premature engine wear if oil changes are not done more often.
Senior technical advisor for Cummins Inc., Howard Fang, explains to Biodiesel Magazine exactly how this inordinate accumulation of biodiesel in the crankcase oil takes place.
Cummins has done extensive work to characterize biodiesel's effects on engines, performance and exhaust. "Biodiesel definitely promotes fuel dilution," Fang says.
Post-injection of fuel into the cylinders is intended to vaporize in the cylinder but not combust, exiting then through the exhaust valves and traveling downstream where the introduction of the unburned fuel to the catalyst creates an exothermic reaction incinerating the collected soot. Inevitably the heavier fractions of fuel will not vaporize during post-injection and in liquid form can adhere to the cylinder walls. Through the slapping motion of the pistons and oil rings, the unburned fuel from post-injection can make its way through the tight, hot quarters between the piston, rings and cylinder walls. The fuel accumulates in the crankcase and dilutes the oil, which is a major concern regarding engine wear and longevity.
"Using post-injection you will generally see elevated levels of fuel dilution regardless of what fuel you're using," Sappok says. Because biodiesel has a higher distillation temperature and boiling point, when it's present in the post-injected fuel it tends to dilute the oil on a level disproportionate to its blend ratio in the fuel. Fang says this is just now becoming understood.
http://www.biodieselmagazine.com/articl ... n-problem/
Аз бе коментирам биодизела изобщо, а във връзка с дпф.
We can tolerate up to 50 percent fuel mix in the oil but no more
Върни се в “Дизелови агрегати”
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