Intermittent wipers

[Lahucheapin]

Hi!
Is there something to add to have intermittent wipers on a split? Thing like a external module?

Thank's

[Who.Me?]

I looked in the past and couldn't find anything suitable.

All the ones I found needed a two speed wiper motor and/or one with self-parking. You'd need to find something that is timer operated (because there's no self-parking), and doesn't require a two-speed motor. And you'd have to hope that each wiper sweep is a consistent speed (always takes the same mount of time to sweep across the window), so the wipers stop in the same place each time.

I went for adjusting the wiper motor's speed instead. I tend to use my truck in good weather, so if I'm out and it rains it's *usually* light rain. At normal speed, the wipers scrape and judder.

I installed a rotary PWM speed controller. (Ebay purchase.)

It was pretty easy to fit. The hardest part was pulling the wiper motor out to adapt the ground wire, but I was doing that anyhow to fix a mechanical issue that I had at the time.

While the motor was out; I opened its case and disconnected the original ground wire connection, so the motor no longer grounded to the body. I extended that ground wire to connect to the PWM switch.
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Andy


Looking for info on my truck's history. Are you from Campbell California or nearby. Do you recognise it? ... http://www.thesamba.com/vw/forum/viewtopic.php?t=636786

[Eric&Barb]

Ditto. Also using the PWM makes it so the motor has same wiping strength as a stock running. While if one installs a variable resistor would not have same ability to wipe the windshield. Can even burn out the wiper motor with using a resistor.
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In Stereo, Where Available!

[Lahucheapin]

Well... So a project spin around in my head... And this week-end, i realize-it...

I wanted an intermittent wiper system, that it can be add to a split-bus without modified the wiring or original parts. So i made an unit control electro-mechanical. So, no sophistical electronic chips or something that is not with the Mood of a 60’s split-window bus.

2 options offer to me :

1- Control the intermittent by the speed of the center gear
2- Control the intermittent by the number of activated toggle switch

The Option 1 seems to be the best option. But, If the speed of the gear is too fast, the toggle switch may not active enough time to activate the wiper sequence… Too slow, and the toggle switch activate 2 sequences… So, go to the option #2.

I have choose the 3 rpm 12v motor, a lot of tork and really quiet. 3 Rpm, so 1 revolution for 20 seconds. I choose 4 toggle switch and a 3 states button to have a pulse to activate the wipers every 20, 10 and 5 secondes.

Option1 : Only one toggle switch is activate (= a pulse every 20 secondes)
Option2 : Two tuggle switches are activate (= a pulse every 10 secondes)
Option3 : All four tuggle switches are activate (= a pulse every 5 secondes)

ade the control unit and build the prototype witch birch plywood on my laser cutter.

The module is plugged with 3 wires, so 2 plugged on the wiper switch (one with the 54 and one on 54d (yes, i have write b instead of d.. oups!)) and the third is a ground

Made a video of the result. The light represent the pulse send to the wiper motor to start the revolution.

Link

[Lahucheapin]

I'm trying to undestand the full sequense of wipers. And i cannot fund the reason of the 31b... It never used in the sequense. So i have done a test on my 65 split bus (single speed wipers) and disconnect the 31b on the switch. And the wipers still run great... So, does anyone have an explanation? Maybe i'm wrong somewhere in my diagram?..

[Eric&Barb]

Brown is ground in Euro wiring. Thusly ground for the parking wiper circuit.
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In Stereo, Where Available!

[Lahucheapin]

[mdege]

Interesting contraption, but it is way to complicated for self parking wipers.

All you need is a relay that imitates the original switch. Which has two sets of contacts, one normally open and one normally closed.

The normally open contacts turn on the wiper and the normally closed contacts are part of the parking circuit.

Now all you need is something, that provides the timing, this can be a discrete transistor circuit, or a contraption like the one in the previous posts or a bit more modern; a small micro-controller.

I used to have a discrete transistor circuit which worked really well, but I didn't like size of it and the fact, that it floated around on the parcel tray.

To answer the question about 31b: what I remember from 30 years ago. 31b is only connected, when the switch is in the off position. There is a set of contacts in the wiper motor which are connected to 31b as long as the wipers are not in the park position. During the park procedure the current flows from 54 through the motor to the contacts on the large cogwheel in the motor to 31b. Once the cogwheel is in the park position the circuit is cut and the motor stops. It is a one year only thing.

Later models can use the #19 or #99 relay from a Golf 2 or 3 era VW. The wiring will be the same as on those vehicles, same contact numbering. All you need to come up with is a 4 position switch instead of the original three position switch.
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- Michael

1965 21F: Restoration of a former '65 firetruck
1963 Typ3 Notchback project
1988 Multivan Magnum 112i
1984 Standard: My son wanted a bug for his first car