cruise control with dbw
Printed From: the12volt.com
Forum Name: Cruise Controls
Forum Discription: Cruise Control Settings, Tach Signal, VSS PPM(Vehicle Speed Signal Pulses Per Mile), Vacuum, Brake, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=134141
Printed Date: April 24, 2024 at 6:16 PM
Topic: cruise control with dbw
Posted By: dalegthomas
Subject: cruise control with dbw
Date Posted: May 01, 2013 at 1:35 AM
I am building a F5R MK IV Roadster. Engine is a Ford Coyote 5.0 with Drive-By-Wire throttle (no throttle cable). I believe for the throttle connection I somehow need to use the pedal. Can anyone help explain how I can do this? And which product is best for this application?
Cheers, Dale
From this site:
| Throttle |
| This connection can be the easiest and the most difficult to make of all. But don't let it discourage you from installing cruises. So long as you can get a straight pull on the throttle with a smidgen of slack in the cable, then you'll be fine. Most are simple and very straight forward. Some will require a throttle adapter. And some just a little ingenuity, especially when you need to attach to the top of the pedal. Be sure to check the application guide for each vehicle you will install a cruise into. This will give you a list of parts the vehicle requires, or even if it is recommended not to attempt the install. If the vehicle is new and not listed (usually during model year changes), contact your dealer / distributor or manufacturer for any updates. | or the throttle connection I believe I need to somehow use the pedal. " ------------- Building FFR MK IV Roadster
Replies:
Posted By: oldspark
Date Posted: May 01, 2013 at 2:59 AM
IMO it means that you may be able to use whatever signal the throttle to electrical sensor is providing.
It could be an analog voltage or a digital signal - though it's probably analog (a variable resistor) else a mere switch or 2.
Hence how can the above signal also feed the cruise control?
Posted By: dalegthomas
Date Posted: May 01, 2013 at 12:06 PM
Thanks for the response, but that's a bit over my head; I can do it if I'm told how. I guess I'll have to study-up on all this and get wiring diagrams for a late model modular engine Mustang with DBW and see how they make it work. The PCM/harness pack instructions that come with the engine (designed for car builders/hotrods) specifically states that it does not support cruise control. I contacted Ford Racing and they said "if it was easy, we would have done it." and advised that one may have to use the pedal, somehow.
------------- Building FFR MK IV Roadster
Posted By: the12volt
Date Posted: May 01, 2013 at 1:56 PM
You can do a pedal pull installation which is very common now or see if something here will work on your vehicle: https://www.rostra.com/custom-drive-by-wire-aftermarket-cruise-control-by-rostra.php-------------  the12volt • Support the12volt.com
Posted By: dalegthomas
Date Posted: May 01, 2013 at 6:47 PM
12volt, Thank you; the Rostra link contains no Ford applications.
You say pedal installation is very common; that is what I want. I just need some details on how to link the go pedal to the cruise control system...drill hole in pedal arm, attach cable to vac solenoid, etc. with some level of guidance details.
Would appreciate it if someone here could offer a general step-by-step process (just for the pedal connections) with any cautionary notes. ------------- Building FFR MK IV Roadster
Posted By: the12volt
Date Posted: May 01, 2013 at 7:37 PM
You're welcome. I'm away for a bit and on my iPad at the moment, but you should be able to find something on Rostra's site showing a mechanical connection to a pedal. You just want a straight pull on the top as to not interfere with normal operation. ------------- the12volt • Support the12volt.com
Posted By: dalegthomas
Date Posted: May 01, 2013 at 8:02 PM
Will do. Thanks. I'm not in a hurry....planning right now but want to be ready in ~6 wks. ------------- Building FFR MK IV Roadster
Posted By: KPierson
Date Posted: May 01, 2013 at 9:13 PM
Is there not an option for cruise control in the throttle controller? The problem with DBW is that there is no cable, so you can't pull the throttle. Even if you could, with the throttle positions sensors it would put the car in limp mode.
-------------
Kevin Pierson
Posted By: oldspark
Date Posted: May 01, 2013 at 10:33 PM
Hence use its TPS if suitable. Maybe replace with a combo resistive & switch unit?
If the TPS is resistive - hence voltage - connect using an Op-Amp circuit (voltage follower) or some other suitable high-impedance sampling device.
Posted By: dalegthomas
Date Posted: May 01, 2013 at 10:49 PM
I'm trying to visualize getting the Rostra 250-1223 to work by using the pedal arm as a stand-in for the throttle cable. I can attach the control cable to the pedal arm , make the adjustment for idle-to-WOT travel and place the controller behind the firewall on the engine side; won't work on cookpit side because there is no fulcrum point above the DBW module. Guess I would have to build an insulated box for the controller 'cause it would be near the headers. Does this make sense?'
Kevin, I don't think there are any options with the throttle. Perhaps with original harness set-up for say a late model Modular 5.0 Mustang. I still have to explore what the difference is between the Mustang, etal and the Ford Racing harness/PCM. Homework..... ------------- Building FFR MK IV Roadster
Posted By: dalegthomas
Date Posted: May 02, 2013 at 6:00 PM
I can really picture the control cable-to-module configuration. Can Rostra 250-1223 control cable have gradual bends in it?
-------------
Building FFR MK IV Roadster
Posted By: dalegthomas
Date Posted: May 02, 2013 at 6:01 PM
I meant I CANNOT really picture the control cable-to-module configuration. Can Rostra 250-1223 control cable have gradual bends in it?
-------------
Building FFR MK IV Roadster
Posted By: racerjames76
Date Posted: May 04, 2013 at 10:22 AM
The cable can be looped so long as the inner braided cable still moves freely inside the outer casing. Pretty easy to check. Obviously the straighter the shot the better it can pull, but it is not uncommon to have to put a full 180 or even a 360 loop to wind up the excess cabling. The bigger the loop the better it is.
-------------
To master and control electricity is perfection. *evil laugh*
Posted By: dalegthomas
Date Posted: May 04, 2013 at 1:15 PM
racerjames76 wrote:
The cable can be looped so long as the inner braided cable still moves freely inside the outer casing. Pretty easy to check. Obviously the straighter the shot the better it can pull, but it is not uncommon to have to put a full 180 or even a 360 loop to wind up the excess cabling. The bigger the loop the better it is.
Thanks. That solves a big problem.
When Rostra says do not install controller in passenger cabin due to "noise", what kind of noise are they talking about? How loud? ------------- Building FFR MK IV Roadster
Posted By: oldspark
Date Posted: May 05, 2013 at 6:15 AM
Not the noise you'll hear...
They mean electrical noise.
Posted By: dalegthomas
Date Posted: May 05, 2013 at 10:57 AM
oldspark wrote:
Not the noise you'll hear...
They mean electrical noise.
OK, I get it now. Thanks.
------------- Building FFR MK IV Roadster
Posted By: racerjames76
Date Posted: May 14, 2013 at 9:26 AM
I may be adding further confusion to the situation but my redneck engineer hat popped on and I had a thought. What about some sort of pulley behind the pedal allowing the cruise to sit 90 degrees to the side of the pedal on either side. Attach a cable to do the pulling through the pulley and then attach the rostra cable to the end of that new cable?  I done confused myself.  Whatever the result is here obviously fail safes need to be considered. As in will any of what you add cause the throttle to either not work, or worse get stuck. ------------- To master and control electricity is perfection. *evil laugh*
Posted By: dalegthomas
Date Posted: May 15, 2013 at 10:05 AM
That's not a bad idea. A pulley attached to the firewal; a cable from the pedal (would have to attach below the pivot, due to configuration of dbw) through pulley and then to control cable. It will be several months before I get to it, but will post success - or lack of - here.
-------------
Building FFR MK IV Roadster
|