Toyota Innova Owners & Discussions [ARCHIVED]

[ladoresjomar]

Anu ba mapapansin mo pag me problem EGR mo??

on my ride i notice na di na ganon kabilis ang hatak niya kaya wondering if this has to do with it?


WBR,

Sir welcome back sa forum.....

EGR in spark-ignited engines
In a typical automotive spark-ignited (SI) engine, 5 to 15 percent of the exhaust gas is routed back to the intake as EGR (thus comprising 5 to 15 percent of the mixture entering the cylinders). The maximum quantity is limited by the requirement of the mixture to sustain a contiguous flame front during the combustion event; excessive EGR in an SI engine can cause misfires and partial burns. Although EGR does measurably slow combustion, this can largely be compensated for by advancing spark timing. The impact of EGR on engine efficiency largely depends on the specific engine design, and sometimes leads to a compromise between efficiency and NOx emissions. A properly operating EGR can theoretically increase the efficiency of gasoline engines via several mechanisms:

• Reduced throttling losses. The addition of inert exhaust gas into the intake system means that for a given power output, the throttle plate must be opened further, resulting in increased inlet manifold pressure and reduced throttling losses.

• Reduced heat rejection. Lowered peak combustion temperatures not only reduces NOx formation, it also reduces the loss of thermal energy to combustion chamber surfaces, leaving more available for conversion to mechanical work during the expansion stroke.

• Reduced chemical dissociation. The lower peak temperatures result in more of the released energy remaining as sensible energy near TDC, rather than being bound up (early in the expansion stroke) in the dissociation of combustion products. This effect is relatively minor compared to the first two.

It also decreases the efficiency of gasoline engines via at least one more mechanism:

• Reduced specific heat ratio. A lean intake charge has a higher specific heat ratio than an EGR mixture. A reduction of specific heat ratio reduces the amount of energy that can be extracted by the piston.

EGR is typically not employed at high loads because it would reduce peak power output. This is because it reduces the intake charge density. EGR is also omitted at idle (low-speed, zero load) because it would cause unstable combustion, resulting in rough idle.

[ladoresjomar]

Anu ba mapapansin mo pag me problem EGR mo??

on my ride i notice na di na ganon kabilis ang hatak niya kaya wondering if this has to do with it?


WBR,

Sir welcome back sa forum.....

EGR in spark-ignited engines
In a typical automotive spark-ignited (SI) engine, 5 to 15 percent of the exhaust gas is routed back to the intake as EGR (thus comprising 5 to 15 percent of the mixture entering the cylinders). The maximum quantity is limited by the requirement of the mixture to sustain a contiguous flame front during the combustion event; excessive EGR in an SI engine can cause misfires and partial burns. Although EGR does measurably slow combustion, this can largely be compensated for by advancing spark timing. The impact of EGR on engine efficiency largely depends on the specific engine design, and sometimes leads to a compromise between efficiency and NOx emissions. A properly operating EGR can theoretically increase the efficiency of gasoline engines via several mechanisms:

• Reduced throttling losses. The addition of inert exhaust gas into the intake system means that for a given power output, the throttle plate must be opened further, resulting in increased inlet manifold pressure and reduced throttling losses.

• Reduced heat rejection. Lowered peak combustion temperatures not only reduces NOx formation, it also reduces the loss of thermal energy to combustion chamber surfaces, leaving more available for conversion to mechanical work during the expansion stroke.

• Reduced chemical dissociation. The lower peak temperatures result in more of the released energy remaining as sensible energy near TDC, rather than being bound up (early in the expansion stroke) in the dissociation of combustion products. This effect is relatively minor compared to the first two.

It also decreases the efficiency of gasoline engines via at least one more mechanism:

• Reduced specific heat ratio. A lean intake charge has a higher specific heat ratio than an EGR mixture. A reduction of specific heat ratio reduces the amount of energy that can be extracted by the piston.

EGR is typically not employed at high loads because it would reduce peak power output. This is because it reduces the intake charge density. EGR is also omitted at idle (low-speed, zero load) because it would cause unstable combustion, resulting in rough idle.

[ladoresjomar]

Anu ba mapapansin mo pag me problem EGR mo??

on my ride i notice na di na ganon kabilis ang hatak niya kaya wondering if this has to do with it?


WBR,

EGR in diesel engines
In modern diesel engines, the EGR gas is cooled through a heat exchanger to allow the introduction of a greater mass of recirculated gas. Unlike SI engines, diesels are not limited by the need for a contiguous flamefront; furthermore, since diesels always operate with excess air, they benefit from EGR rates as high as 50% (at idle, where there is otherwise a very large amount of excess air) in controlling NOx emissions.
Since diesel engines are unthrottled, EGR does not lower throttling losses in the way that it does for SI engines (see above). However, exhaust gas (largely carbon dioxide and water vapor) has a higher specific heat than air, and so it still serves to lower peak combustion temperatures; this aids the diesel engine's efficiency by reduced heat rejection and dissociation. There are trade offs however. Adding EGR to a diesel reduces the specific heat ratio of the combustion gases in the power stroke. This reduces the amount of power that can be extracted by the piston. EGR also tends to reduce the amount of fuel burned in the power stroke. This is evident by the increase in particulate emissions that corresponds to an increase in EGR. Particulate matter (mainly carbon) that is not burned in the power stroke is wasted energy. Stricter regulations on particulate matter(PM) call for further emission controls to be introduced to compensate for the PM emissions introduced by EGR. The most common is particulate filters in the exhaust system that result in reduce fuel efficiency. Since EGR increases the amount of PM that must be dealt with and reduces the exhaust gas temperatures and available oxygen these filters need to function properly to burn off soot, automakers have had to consider injecting fuel and air directly into the exhaust system to keep these filters from plugging up.

[Trebuchet]

Forgot to mention, my boss have the Innova J D4D (2005)

[Mardagatan]

Hello everyone,

I'm new here. I just have my Innova G gas M/T about two weeks ago. I just would like to know if it is normal for the engine to run at 1500 rpm initially when first started? However, after a short while the engine rpm gradually drops down to around 1000 or so rpm. Is this normal?

Maraming salamat po.

[janeiroseis]

[SIZE=3]It's normal, AFAIK.

There's an Innova thread btw. Kindly search for it.
[/SIZE]

[meledson]

Hello everyone,

I'm new here. I just have my Innova G gas M/T about two weeks ago. I just would like to know if it is normal for the engine to run at 1500 rpm initially when first started? However, after a short while the engine rpm gradually drops down to around 1000 or so rpm. Is this normal?

Maraming salamat po.

Could be part of the warm up sequence of the engine. Pag umabot na sa typical running temp, bababa na ang RPM.

[tedd]

INNOVA CLUB EB Nov. 17, 2007 McDonald's Macapagal 4PMKindly confirm your attendance... Copy and paste na lang po.1. Liv2. papabong3. BoyT4. Bondying0015. Luigi6. GLD7. larry_tekwix pero tentative pa.8. Tedd9. this one naman po eh dun sa mga gustong kumuha ng sticker... the sticker is on a limited basis only... meaning eksakto lang po papriprint ko depending on the names ng magsa sign up dito... NOTE: make sure lang po that you will attend the EB when you sign up here for the sticker.1.Luigi2.GLD3.Tedd

[u2ykins]

Hello everyone,

I'm new here. I just have my Innova G gas M/T about two weeks ago. I just would like to know if it is normal for the engine to run at 1500 rpm initially when first started? However, after a short while the engine rpm gradually drops down to around 1000 or so rpm. Is this normal?

Maraming salamat po.

Welcome to tsikot.com and you can also join the Innova Club.ph. Congratulation as well for acquiring Innova. you won't regret owning one.

yes it's normal to run at higher rpm initially when first started. iyan din ang question ko noong una sa SA ng makuha ko ang unit. kaya don't worry normal lang iyan sa innova natin. enjoy and drive safely.

[liv]

[SIZE=5]INNOVA CLUB EB Nov. 17, 2007 McDonald's Macapagal 4PM[/SIZE]

Kindly confirm your attendance... Copy and paste na lang po.

1. Liv
2. papabong
3. BoyT
4. Bondying001
5. Luigi
6. GLD
7. larry_tekwix pero tentative pa.
8. Tedd







this one naman po eh dun sa mga gustong kumuha ng sticker... the sticker is on a limited basis only... meaning eksakto lang po papriprint ko depending on the names ng magsa sign up dito... NOTE: make sure lang po that you will attend the EB when you sign up here for the sticker.

1.Luigi
2.GLD
3.Tedd

updated list as of Nov. 12, 2007 5:26PM

[liv]

Hello everyone,

I'm new here. I just have my Innova G gas M/T about two weeks ago. I just would like to know if it is normal for the engine to run at 1500 rpm initially when first started? However, after a short while the engine rpm gradually drops down to around 1000 or so rpm. Is this normal?

Maraming salamat po.

welcome to Innova Club Sir! join po kayo samen sa EB on Sat.

[j_avonni]

welcome to Innova Club Sir! join po kayo samen sa EB on Sat.

Sa Sat na pala ang EB. Hindi ako sure. Pero, again, I'll try my best to attend.



:beer: 3330

[liv]

Sa Sat na pala ang EB. Hindi ako sure. Pero, again, I'll try my best to attend.



:beer: 3330

you might want to check Manila Auto Salon din po sa me MOA... enough reason to go to the EB after.

[Mardagatan]

Thank you so much for the quick reply. Alam ko na nga normal pala na mataas ang rpm when the engine is first started.

Salamat po sa inyo.

[liv]

Thank you so much for the quick reply. Alam ko na nga normal pala na mataas ang rpm when the engine is first started.

Salamat po sa inyo.

you might want to join us Sir sa EB on Saturday.

[kokey]

Innova ang isa sa pinagpipilian namin ipalit sa STAREX namin. Solve na nga kaya talaga ang D4D bug?

[liv]

Innova ang isa sa pinagpipilian namin ipalit sa STAREX namin. Solve na nga kaya talaga ang D4D bug?

AFAIK wala na pong problema newer batch ng D4D... sana nga sir maging ka- Innova ka namen.

[boyT]

4 days to go ... EB na ulit. Sana ma-beat ng coming EB ang number na umattend last EB. New faces and new members

[liv]

4 days to go ... EB na ulit. Sana ma-beat ng coming EB ang number na umattend last EB. New faces and new members

sana nga... nakapunta ka na Seatmate?

[liv]

paging Hahnvin, Simlim, Noel RMT... paramdam naman kayo!