Thread: Fusion Brain and Window Contorls

Originally Posted by 2k1Toaster

and for automated windows, put a current sensor on the motors. When current draw gets to about 150% of normal, it is fully up or down, so turn off output.

Wouldn't it just be easier to put the relays on a timer?

Pros: You don't have to buy a current sensor

Cons: You have to time how long it takes for the window to close

Concerns: Will the other method of using a current sensor cut power sooner than just timing how long it takes the window to roll up? I'm imagining that the timer wouldn't be active more than a second or two than it needs to be; this is also probably how long the average person holds the button longer than need be held to close/open the window.

what about sensing voltage... It's acceptable for motor speed control circuits. Motor slows=> CEMF voltage across the motor goes down, etc.
As far as the timer, I'd hate to be the one who gets something stuck in the window.

A timer assumes the window will travel the full distance. If it's already closed, that's a lot of current going through the motor for a long time.

Originally Posted by Dan2008

Ummm...aren't power windows required to stop (as a safety feature) when they hit an obstruction? Of course you would need feedback from the window drive motor to tell the FB it had stopped so it could turn the relay off.

well if the output of the brain is a pulse (long enough to register factory auto-down) across the window switch, then yes you can take advantage of the OEM circuitry to provide that safety. But if the way the interface with the brain drives the window is more direct (which I would stay away from, if possible), or the window never had auto-up, then no, the overload in the window motor will probably open first and I don't think that switch is designed with obstruction detection in mind. But I might be wrong about that.

I'm not sure what the wiring on windows are like but I'm assuming it's something like this:

----------------------------
|
|OPEN
\
\ ---SWITCH----------------

|
|CLOSE
----------------------------


If this is the case, then setting up the relays like this is my plan


----------------------------
| \
|OPEN \ RELAY 1
\ \
\ ---SWITCH----------------
/
| / RELAY 2
|CLOSE /
----------------------------



Does anyone KNOW what the effect would be if both the "open" and "close" circuits are both CLOSED at the same time? I'm going to guess that the circuit would be short circuited and the motor would not move at all. But I'm worried what the effect on the battery and circuitry would be.

what vehicle is this...?

Originally Posted by h3rk

what vehicle is this...?

I would think that all power windows, that have a single switch, would follow that wiring. I'm not sure how else they'd do it.