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alex_pescaru



Member Since: 12 Mar 2009
Location: RO
Posts: 4640
Re: Auto gearbox

Matthius wrote:
The thing that makes me still worried a bit is the electronics involved. Won't it do anything that would impact the mechanism?


The transmission takes information from its sensors:
- transmission input speed
- transmission output speed
- transmission fluid temperature sensor
- switches from the gear lever
Also comunicates with:
1) Engine ECU for:
a) engine temperature info
b) throttle possition info
c) cruise control info
d) telling to engine ECU when to reduce engine torque for smoother shift
2) ABS ECU - for road speed.
Based on all these information gearbox ECU can determine in any moment all the information needed in order to change or to not change gears efficiently.
Imagine, just by changing firmware (the program inside ECU) you can optimize and actuate anything. And as long as "the program" is written correctly, all is OK. You can't damage the mechanism.

Last edited by alex_pescaru on 10th Feb 2010 5:02 pm. Edited 1 time in total
Post #59009 10th Feb 2010 4:51 pm
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mcphersonstrut



Member Since: 21 Jul 2009
Location: In the land of 2 wheel drive and 60mpg
Posts: 2164
England 2008 Freelander 2 TD4 HSE Auto Stornoway Grey

Just a few weeks ago I had mine in at the dealers as the mpg was poor and the shift changing back down when slowing down seemed a bit 'early' - They did something to the Engine and Gbox ECU and for exactly the same driving style I'm getting 26/27 mpg (was 22 +/-) Thumbs Up
Post #59010 10th Feb 2010 4:56 pm
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alex_pescaru



Member Since: 12 Mar 2009
Location: RO
Posts: 4640
Re: Auto gearbox

Matthius wrote:
alex_pescaru wrote:

PS: The option that says on Wikipedia that "One aspect of the advanced nature of the electronics is at idle, it automatically selects neutral gear to reduce internal temperatures and improves fuel economy." is disabled on FL2

Any idea why did they disable it?

It's an off-road oriented car.
Imagine you are on a slope and you are stopping.
The transmission thinks that you are on a street at traffic lights and changes into neutral - bad guess and choice. Laughing
You suddenly need all the torque available in order to not fall into the precipice below and the transmission is in neutral... BAD COMBINATION! Laughing
Post #59011 10th Feb 2010 4:56 pm
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Matthius



Member Since: 21 May 2008
Location: Warsaw
Posts: 42
Poland 2007 Freelander 2 TD4 S Auto Stornoway Grey
Re: Auto gearbox

Thanks for all the replies, Alex! Thumbs Up
Post #59012 10th Feb 2010 5:01 pm
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