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Sesi mengopi TANPA beli kopi #700

7/23/2019

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Sesi mengopi TANPA beli kopi #700
(Tuan/puan boleh tanya sebarang soalan berkaitan industri kereta terus ke FB Messenger saya)

SOALAN:

My car saga flx tahun 2012
Cvt light turn on once my speed above 100km/h
Once i reduce speed cvt light off
I went to proton n they said input n output speed sensor prob
So i ask them to change
Once changed the problem still same
I went to proton again n they say waiting answer from technical side hq
Any comment on this matter bro

JAWAPAN:

What is a continuously variable transmission?

A continuously variable transmission, or CVT, is a type of automatic transmission that provides more useable power, better fuel economy and a smoother driving experience than a traditional automatic transmission.

How CVT works?

Conventional automatic transmissions use a set of gears that provides a given number of ratios (or speeds). The transmission shifts gears to provide the most appropriate ratio for a given situation: Lowest gears for starting out, middle gears for acceleration and passing, and higher gears for fuel-efficient cruising.

How to drive a CVT gear car?

First up, you shouldn’t hill-hold on the throttle. This applies to the clutch-equipped type of CVTs in particular, as the transmission is only partially engaging the clutch to hold the vehicle on throttle, and the clutch is slipping for the balance between moving forward or rolling back. Like on a manual transmission or dual-clutch transmission, this is bad because it can cause the clutch to overheat and sustain premature wear.

Coasting in neutral is a no-no too. This isn’t so much as case of drawbacks, rather than what it can do better if it is left to its one devices. Depending on the type of CVT, it will either regenerate the vehicle’s momentum into electrical energy if it is a hybrid, or it will disengage itself without driver input.

Next, do not neutral-drop the transmission. The same applies here as it does for conventional automatics; revving the engine in neutral for high rpm and then immediately engaging drive will damage the transmission. Even high-performance applications of a dual-clutch transmission with launch control will have a limit to how often this can be done before it calls up a form of safe mode to cool the transmission.

Just like in conventional automatics, it is best to stop completely before changing direction of travel (forwards or backwards), as engaging gear for a different direction before doing so puts undue strain on the transmission and can result in damage. Put simply, do not go from forwards to reverse – or vice-versa – before coming to a complete stop.

For clutch-based CVTs, constant inching forward in traffic over a prolonged period may also cause issues. The partial engagement of the clutch results in slipping and therefore possible overheating and premature wear. In more modern types of CVTs, those that employ electric motors (e-CVTs) or a torque convertor as part of its system, however, this is no issue at all.

There is news on Proton Saga CVT recall 8 years ago for this issue.

The reason for CVT light turning on is because of gearbox overheating.

The solution back then was to send the car back to Proton service centre to change CVT pump, clutch adaption, fuel hose, and adding extra CVT cooling hose

Either you experiment changing the way you drive or send it back to Proton service again if the problem persists.

Eddie Soh
EH Motor (ditubuh 1985)
Blacklist, CCRIS, Full loan untuk beli kereta

#EHMotor
#Sesimengopitanpabelikopi
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