2005 TBC...no trailer brake power until over 10mph - Page 5 - Ford Powerstroke Diesel Forum
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post #41 of 52 Old 05-29-2019, 01:26 PM
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I don't think the vehicle manufacturer is going to recommend towing on ice though - lol

Mud and gravel will be a lot harder to avoid, but it would be wise to avoid steep slopes in those conditions - if at all possible anyway.

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post #42 of 52 Old 05-29-2019, 05:05 PM
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Where's @djmaguire with his schematics? I bet he could figure out how get the factory TBC to stop a 10k trailer under 15 mph.

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post #43 of 52 Old 05-29-2019, 05:17 PM
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You just need to mount one of these on the dash...



...and throw when needed.

Okay... okay... I'll look at what I've got.

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Edited to add...
Wait. I have to read a 42-reply thread?!? There had better be some *really* insightful and inspirational stuff here. Like Confuscious-level shiite.
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post #44 of 52 Old 05-29-2019, 06:00 PM
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It's really not that big of a deal. If you want to slow down faster, just speed up a bit.
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post #45 of 52 Old 05-30-2019, 10:45 AM Thread Starter
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Quote:
Originally Posted by Mcflyfyter View Post
It's really not that big of a deal. If you want to slow down faster, just speed up a bit.
Great idea!

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post #46 of 52 Old 05-30-2019, 08:40 PM
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Could "fake" the speed input to the brake controller so it would think you were traveling over 15mph -- a fairly simple add on circuit to add pulses to the speed input -- could make it adjustable so you could choose the "gain"

Thinking an opto isolator circuit to eliminate feedback and a 555 timer to add the pulses

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post #47 of 52 Old 05-31-2019, 03:42 AM
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Quote:
Originally Posted by Hydro View Post
Could "fake" the speed input to the brake controller so it would think you were traveling over 15mph -- a fairly simple add on circuit to add pulses to the speed input -- could make it adjustable so you could choose the "gain"

Thinking an opto isolator circuit to eliminate feedback and a 555 timer to add the pulses
I haven't had a chance to dig in any docs, but I think that @Hydro is really going in a solid direction here.

Maybe the TBC was intended to not do much at low speeds. The attached doc suggests that. Then, it becomes a matter of preference.

@Hydro 's mention of the isolator and 555 timer to add pulses is a fine approach. There might be some irregularity in the timing, but the TBC wouldn't likely discern it.

A few logic gates could be used as a frequency doubler. A phased-locked loop (PLL) circuit could be used to multiply the frequency of the pulses by 3 or 4 times. Either would be a very clean way to do it since the actual pulse trian would be being "multiplied" resulting in stable/uniform pulse timing. Fun stuff.

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post #48 of 52 Old 05-31-2019, 06:11 AM
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I suppose it depends on the origin of the signal used by the TBC -- may get it directly from the transmission speed sensor or from the buss system from the instrument cluster or PCM -- kinda need schematics to see the direction of the signal

The opto and timer setup would in the simplest form do what is needed and be user adjustable -- if the signal is direct

Maybe the signal is sent over the buss system -- then would need to isolate and modify the network messages -- an Arduino(Nano) or Raspberry(II) could work here and still be inexpensive

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post #49 of 52 Old 05-31-2019, 07:04 AM
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In looking at the connector, I can't really figure where a speed input comes into play. I'll attach the relevant section of the workshop manual. The connector is C2142.

Regarding my comments about logic gates and PLLs... I was only suggesting them as ways that - no matter what the speed signal would be - the signal would be automatically doubled/tripled/quadrupled in frequency.

An example of the logic gate way is this:



No matter the input frequency, the output frequency is doubled. In this way, if there is some other dependence on speed at higher speeds, it might be maintained. Might.

I wasn't suggesting that there was any problem with a fixed speed fooler circuit. I'm only saying that one that tracks speed and multiplies it might preserve some other modes of operations.

...but, again, I can't see a speed signal in the connector. So...
Attached Files
File Type: pdf Super Duty_04-Electrical and connectors - 8 of 8.pdf (3.02 MB, 18 views)

2004 F550 CC Lariat
BPD oil cooler relocation and upgraded EGR cooler (spooled), BPD oil bypass filtration, aFe Magnum Force CAI, Mishi radiator, 7.3L fan clutch, EC1 ELC, XDP coolant bypass filtration, '08 trans pan/filter, PTP direct clutch solenoid, blue spring, 6.4 starter, MBRP y-pipe, BD boots/clamps, '05 intake elbow, ccv reroute, Torque Pro + OBDLinkô LX, Autometer EGT
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post #50 of 52 Old 05-31-2019, 04:09 PM
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Looking at that connector information, there is no speed input -- is the braking limit characteristic only active on certain model years?

I have not noticed any braking limitation below 10mph on my 2006 F250 -- but then again I will be noticing next time I have a trailer hooked

Need more information

In my defense, I was unsupervised
.
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Torque Pro and OBDLink MX bluetooth monitor
General note:
For all those wanting a premium silicone sealer Kubota 70000-73764 is the best your gonna find. This is a hybrid gray silicone that uses solvent rather than acid to start the curing reaction, this makes it safe for aluminum and and any surface that involves coolant.
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