MoTeC Global Forum

Could someone please explain the wiper direct method logic that one must use in setting up the wipers.

Thanks,

Az

aalzuhair

if you could avoid doing that it would be better.......

What car??

Why not leverage the stock wiper systems circuitry and power that? In most cars, the wiper system is it's own independant system which can be isolated from the harness. I did that with my car. Time consuming BUT still works exactly like stock with the benefit of being able to monitor current/voltage useage when active via the PDM software

Thanks figgie,

its going on a 350z and the thing is that the OEM wiring is heavy and everything is connected via a smart power distributor, something like a PDM which can not be re-wired.

Thus, my only option is to have the PDM control the wipers .. I guess MoTeC support should have the answer

Az

You get more functionality out of running the direct method over the cars normal system, as you can trigger the wiper from any source connected to the PDM and change your wiper dwells.
The down side is you only get the high speed wipe (which isn't a problem for most people) and it uses more PDM inputs.

Depending on the wiper motor, it is usually best if you can connect the park switch (brush switch on motor) to use the normally open (NO) contact, so that you get a switch to ground while the wiper is moving and open circuit when the wiper is at the bottom of the wind screen. This is because the NO contact switches just before the NC contact which helps in stopping the wipers in the park position.
So you end up with a input Wiper.Switch.Park that is true when the wipers are not at the bottom of the screen. Remember to set the times for the switch input both to 0.00 seconds.

There are two methods of setting up you wipers.
1. Simply put the Wiper.Switch.Park = True in the Wiper.Output (output 9) condition. This means if the wiper is not at the bottom of the screen then the wiper runs.
Then OR the trigger conditions with this. The trigger condition might be Flash 0.5s on, 6s off when Wiper.Switch.Intermittent = true.

2. Use the inverse of the Wiper.Switch.Park channel in a Set-Reset operation as the reset condition to drive Wiper.Output (output 9). This means if the Wiper.Switch.ParkInverse channel gets the shortest of pulses (>20mS) the wiper will stop regardless of if the wiper travels past the park position, until the set condition (trigger to start the wiper) becomes true.

The attached PDM config contains both methods. 1. on output 9 and 2. on output 10.
Output 9 must be used tho, as this is the only output to have motor braking to stop the wiper suddenly.
I Also added a wiper trigger when the washer is used. Wipers wait for 0.5 seconds to wet screen then wipe for 4 seconds (~3 wipes) after the washer has stopped.

Another function i am about to do on my own road car (with a PDM30) once i get ground speed on CAN into the PDM is speed dependant wiper dwell. Where my wiper dwell varies on the wiper stork as normal but also on ground speed, so longer dwell at low speeds, and shorter dwell at high speed. Also wipe immediately when going from stopped to moving!

Thank you very much

been also having problems with the wiper motor. thanks for providing the information and the pdm. i can't seem to find other references online

Darren, would you please re-post your attachment with direct wiper logic diagrams? The attachment no longer pulls up. Thank you.

--Peter

Works great here. Anyway:

Thanks. Must be a problem on my end because it still does not pull up.

--Peter

Herrubermensch wrote:Thanks. Must be a problem on my end because it still does not pull up.

--Peter

I can get it as well.
I can email it to you if you PM me your email.