Fahamu kuhusu matumizi ya OverDrive (OD) kwenye gari automatic

LAT said:

great .... sasa basi ni wakati gani hasa inapaswa kuweka overdrive off .... pia inafaida gani kuweka OD OFF?

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When you need more cruising POWER..ukitaka kuovertake ama pale gari ikiishiwa nguvu unapopanda mlima nk

hiyo ina deliver more power with less fuel consumption kwenye sehemu kama mlina etc

In normal drive taa haitakiwi kuwaka.remember dashboard indicators zikiwa red ni alert kuwa kitu husika hakipo katika hali ya kawaida inavyotakiwa kiwe

Wadau naomba msaada kwa anayejua au kufahamu matumizi sahihi ya O/D, Haya Magari yetu ya kisasa, (Automatic) yana vitu vingi nahisi watu wengu atufahamu.

Hasa Matumizi sahihi ya Over Driving itumike au inatumika wakati gani,na wakati gani inakuwa on na wakati gani inakuwa off.Wadau naombeni msaada wenu, hii O/D inakuwa on pale taa ya O/D Inapoonyesha O/D OFF au isipoonekana kabisa?

Na hii O/D itumike muda gani napoendesha gari?

Naomba msaada wenu wadau.

Ngoja waje wenyewe

Mimi pia nilihitaji sana kujua kuhusu hii kitu...

Kuna uzi tulijadili na kuelezana kwa kirefu humu miaka ya nyuma. Tafadhali rejea kwenye uzi huo na kama hutafanikiwa tufahamishane.

wakati tunajadili nyie mlikuwa wapi? Google inafanya kazi gani?

Overdrive. Wheres a button on your gear shifter most likely. You want the overdrive to be on, especially for highway usage. Its a built in extra gear, basically, that put the car at low rps in top gear.

Google tu utaipata mkuu!

Mbalamwezi said:

Kuna uzi tulijadili na kuelezana kwa kirefu humu miaka ya nyuma. Tafadhali rejea kwenye uzi huo na kama hutafanikiwa tufahamishane.

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...O /D Over drive button:

Overdrive on ni pale (kwa wale button ziko kwenye gear za chini pembeni sina uhakika kwa staff gear) button inapokuwa ndani na maana umeikandamiza ndani au umeiminyia ndani na OD off pale inapotoka nje. Kazi yake OD on huifanya engine izunguke kidogo lakini mwendo kasi uwe mkubwa na kuifanya gari isile mafuta sana. It best perform at a speed more than 70km/hr. If you are driving a car with revolution per min rpm scale on your dashbody put OD off and drive till 100 km/hr while checking rpm scale then switch OD on at the same speed you will find the rpm scale is sharply dropping down and the car speed increases slightly. If two similar engines run a cars at the same velocity but one with low rpm whilst the other with high rpm, consequently the one with high rpm will consume more fuel than with low rpm at the same velocity.

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Overdrive kama ilivyo Ni gear ya juu unapohitaji mwendo na fuel consumption ndogo au gia namba 5. Mara nyingi gari za kawaida huwa na Gear 4 na ya tano ndio final au O/D hivyo kwa hali ya kawaida inabidi iwe ON na dashboard isionyeshe kitu hivyo utakuwa unadrive kwa moangilio unaotakiwa wa gear yaani 1_2,2-3,3-4 na hatimaye 4-5.Lakini ikiwa O/D OFF(taa ya dashboard itawaka kukutahadharisha) kuwa unadrive mwisho gear no 4 tu hata kama engine revolution ipo high.yaani unacruise na power zaidi na unatumia more fuel ndio maana hata taa itawaka kukukumbusha Normal it should be ON_ but the light is off! Na ukiweka OFf ni pale unapohitaji kuongeza nguvu kama kuovertake ama kupanda mlima.yaani ingekuwa manual ni unapangua gia kurudi gia kubwa upate nguvu zaidi kuoanda mlima ama kuovertake na hivyo kunywa zaidi mafuta Matumizi ya kawaida OD iwe off na taa ya kwenye dashboar isiwake Kumbuka taa nyingi za Dashboard ni ALERTS au WARNINGS kuwa kuna kitu kipo katika hali isiyo ya kawaida kimatumizi.

haya ndiyo niliyoyakuta...

Thread za hivi mbona zinajirudiarudia sana jf?!! Tukishajifunza mtaani kishkaji tuwe tunapita kwenye madarasa ya wale jamaa yanasaidia sana kujua function ambazo kwa kawaida unazioverlook kwa sababu haujui zina kazi gani, hata kujua basics za mechanics ni muhimu sana, unaweza kulala porini kwa tatizo dogo sana!
https://www.jamiiforums.com/habari-...utumia-functions-katika-auto-cars.html?pp=100

How Automatic Transmissions Works with Overdrive


Overdrive


By definition, an overdrive has a faster output speed than input speed. It's a speed increase -- the opposite of a reduction. In this transmission, engaging the overdrive accomplishes two things at once. If you read How Torque Converters Work, you learned about lockup torque converters. In order to improve efficiency, some cars have a mechanism that locks up the torque converter so that the output of the engine goes straight to the transmission.

In this transmission, when overdrive is engaged, a shaft that is attached to the housing of the torque converter (which is bolted to the flywheel of the engine) is connected by clutch to the planet carrier. The small sun gear freewheels, and the larger sun gear is held by the overdrive band. Nothing is connected to the turbine; the only input comes from the converter housing. Let's go back to our chart again, this time with the planet carrier for input, the sun gear fixed and the ring gear for output.

Ratio = 1 / (1 + S/R) = 1 / ( 1 + 36/72) = 0.67:1​

So the output spins once for every two-thirds of a rotation of the engine. If the engine is turning at 2000 rotations per minute (RPM), the output speed is 3000 RPM. This allows cars to drive at freeway speed while the engine speed stays nice and slow.

The Gear Vendors overdrive cutaway displays that it is a self-contained, auxiliary transmission with direct drive and a .78:1 overdrive ratio.

overdrive simply ni the last gear in your gearbox,kwa kawaida most automatic geared cars huwa na gear 4,asa ukiweka overdrive off unakuwa unatembelea gear 1-3,ya 4 inakuwa off.hii iko useful in town roads ambzo ziko congested ambzo u rarely reach 4th gear,ukiweka overdrive on the 4th gear inakuwa engaged.
as a simple test chkua gari yako,drive it huku o/d off alaf angalia kama utavuka 90km/h kirahisi.

seandon said:

overdrive simply ni the last gear in your gearbox,kwa kawaida most automatic geared cars huwa na gear 4,asa ukiweka overdrive off unakuwa unatembelea gear 1-3,ya 4 inakuwa off.hii iko useful in town roads ambzo ziko congested ambzo u rarely reach 4th gear,ukiweka overdrive on the 4th gear inakuwa engaged.
as a simple test chkua gari yako,drive it huku o/d off alaf angalia kama utavuka 90km/h kirahisi.

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Mazingira ya barabara zetu za bongo hii overdrive isingetakiwa kutumika maana barabara za nchi zilizoendelea kwa mtindo wa barabara zetu za bongo ni za speed 35 -40 per mile na tungeweza kutafsiri kama 60 per km. Hizi over drive ni uendeshaji wa barabara kubwa ambazo zimekuwa separated by middle meridian cub kutenganisha wa upande huu wanaoenda kinyume cha mwelekeo wa upande wa pili, yaani kiwango cha highway express. Lakini kwetu overdrive tunaitumia kila mahala ndio maana ajali hazipungui.

Wana JamiiForums wenzangu, awali ya yote naomba kukiri mapungufu yangu kupitia lugha hii ya kigeni(Kiingereza), mimi ni muumini mzuri wa Kiswahili, hivyo natumai elimu mtakayo nipa juu ya swali langu litakuwa kupitia kiswahili fasaha.

Binafsi naomba mnisaidie kufahamu umuhimu wa hii kitu inayoitwa "Over Drive" katika gari ya automatic. Nimekuwa nikiiona sana kwenye jamii hii ya magari lakini nini matumizi yake na wakati gani hutumika sijawahi kujua, kwani katika kuendesha kwangu gari na kujaribu kuitumia hiyo O/D sijawahi gundua tofauti.

Swali langu ni kwamba ni wakati gani hii O/D inakuwa inafanya kazi; ni pale ambapo ukiibonyeza na kusomeka kwenye Dashboard iko Off au isiposomeka kwenye Dashboard.

Maana nimewahi wauliza mafundi kadhaa hakuna aliyewahi nipa jibu la uhakika.

Pili naomba kujua faida na hasara za kutumia O/D.

"Asante."
Nawasilisha.

tuwasubiri watahalamu nami nimesha jiulizaga sana

Siijui kwa undani zaidi ila nimewahi kuitumia mara kadhaa. Unapobonyeza kitufe cha O/D, itasomeka kwenye dashboard yako O/D OFF. Hapo inakuwa iko ON kwa gari nilizowahi kuendesha. Mara nyingi ninapokuwa kwenye mwendokasi na nahitaji nguvu na mwendo zaidi wa injini, huwa nabonyeza hiyo O/D, kama kuna gari mbele yangi nitaipita kama imesimama. Nadhani matumizi yake yanahusika na mwendokasi pia ila ukiwa na mwendo wa kawaida sidhani kama inafanya kazi, ngoja wenye uelewa waje watujuze vizuri.

Nenda hapa!
https://www.jamiiforums.com/habari-...i-ya-over-drive-od-kwenye-gari-automatic.html