AWD... for how long?

[Woodys2718]

With our slip then grip AWD system, how long does the rear stay engaged after no more slippage from the front is detected?

 

[Woodys2718]

Wow, all I hear are crickets chirping after nearly 24 hours.

Guess I should just stick to the Moly oil, floor mats and led lighting questions. (rofl2)

 

[piotrek91]

With our slip then grip AWD system, how long does the rear stay engaged after no more slippage from the front is detected?

There is no simple answer to your question.

AWD is not simply on/off. The amount of torque transferred is variable and it depends on a dozen different parameters.
There is 100's of thousand lines of code and calibration tables that determine how the AWD system is controlled.

This is the data that the AWD control module uses to determine how much current to run through the AWD control solenoid:
Engine speed
Engine torque
Accelerator pedal opening angle
Transaxle gear position
Engine off time
Ambient temperature
Car configuration data
Selector lever position
Four-wheel speed
Brake fluid pressure
Coupling torque request
Steering angle/steering angle sensor condition
EPS status
Windshield wiper switch status
Parking brake position

 

[Kedis82ZE8]

I don't really have anything to add to piotrek91's post.

Is this more of a curiosity or do you have concerns about traction?

 

[Chris_Top_Her]

Wow, all I hear are crickets chirping after nearly 24 hours.

Guess I should just stick to the Moly oil, floor mats and led lighting questions. (rofl2)

That's one of those questions where you really cant expect a simple answer.. 5 seconds! Max! Remeber awd is always "on" and the power redirected isn't set. I would guess it calculates what % to transfer and then keeps it there until all wheels are rotating at the same rate (+ a grace period perhaos) or something like that. You can get an idea of how it works by piecing together components and their descriptions from the service manual, but there is no summary with data like that.

 

[inlinev]

The torque split is 100:0 front rear, and up to 50:50 during slippage. The 50:50 split is temporary and the system is not built to hold that for long.

https://www.mazda.co.nz/innovation/driving-engine-technology/active-torque-split-ats-all-wheel-drive

 

[Buzzer777]

WOW....Just enough to really confuse me!

Seriously though...VERY cool: at last a reasonable explanation of a very complex system!

 

[Chris_Top_Her]

The torque split is 100:0 front rear, and up to 50:50 during slippage. The 50:50 split is temporary and the system is not built to hold that for long.

https://www.mazda.co.nz/innovation/driving-engine-technology/active-torque-split-ats-all-wheel-drive

Funny because there are some older pubs that mention 10% rear all the time. But then again the 2016 system is supposedly updated.

Edit: re-read the link and it's talking about max and mins

 

[inlinev]

Funny because there are some older pubs that mention 10% rear all the time. But then again the 2016 system is supposedly updated.

Edit: re-read the link and it's talking about max and mins

I recall the 90:10 ratio as well but can't find it now. The AWD was revised for 2016. But you would think going 100:0 would afford the vehicle better fuel economy but the 2015 and 2016 AWD versions have the same highway rating.

 

[Chris_Top_Her]

I recall the 90:10 ratio as well but can't find it now. The AWD was revised for 2016. But you would think going 100:0 would afford the vehicle better fuel economy but the 2015 and 2016 AWD versions have the same highway rating.

I also could not find a reference to it but I remember it being discussed a lot (been here since 2012)

 

[Kedis82ZE8]

This was some info I gleaned from FSM.

http://www.mazdas247.com/forum/showthread.php?123850161-Misc-CX-5-AWD-technical-info

Normal Control makes it seem some control is applied from a standing start.

 

[Woodys2718]

Thank your everyone for your input.

I was mainly picturing myself this winter leaving my home on a street that hasn't been plowed yet and wondering just how long the AWD would be active once the initial front wheel grip loss was overcome by the AWD activating.

Clearly not an easy question to answer with all the variables in place for the system to activate.

Thanks again,

 

[Kedis82ZE8]

These aren't snow videos but give some idea of AWD performance.