| Author |
Message |
Greg Roberts (63.73.123.39)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, June 28, 2001 - 10:28 am: | |
I was told that a Detroit engine with DDEC II and electronic throttle could easily be upgraded to include a cruise control. Has anyone had any experience with this? |
tfones (Chapter7) (159.49.254.12)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, June 28, 2001 - 11:57 am: | |
Hi Greg,
Looking at the diagrams. It looks like the switches (On, Off, Set, Resume etc.) need to be added to the DDEC and the cruise function activated on the DDEC with a scanner. Can anyone confirm this?
tony |
Clarke Echols (216.17.134.131)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 06, 2001 - 7:26 pm: | |
I put an answer together, but must have fat-fingered the wrong button and it disappeared instead of getting posted, so I'll try again.
You need three dashboard switches, all momentary spring-return single-pole double-throw (SPDT). Each has a "Common", a normally-closed (NC), and normally-open (NO) terminal. One can be a single-throw (SPST), but if you're buying switches and the price is the same -- well, you get the picture.
You also need a SPDT brake switch that is in its normally-closed position when the parking brake is released and the service brakes are also released. This can be done by putting two SPDT air-operated (like brake light switches) in the service and parking brake lines. If you have a clutch (manual transmission only), you'll need a clutch switch as well to kill the cruise control if you depress the clutch pedal to stop or shift gears.
The three dash-panel switches are "Set/Coast", "Resume/Accelerate", and "Cruise Enable". You also need a green indicator light (12-volt). Wire as follows (DDEC wire numbers are in parentheses).
First the brake/clutch switches:
Install a SPDT air-pressure switch in the service-brake line. This switch should trip at about 5 psi line pressure. Install another in the parking-brake line. This one should trip at about 40 or 50 psi (before the parking brake starts to take effect -- like the yellow handle behaves when you lose supply pressure). If you have a clutch, install a SPDT switch there as well so that it trips as soon as the pedal starts going down.
Wiring:
Connect the orange (531) DDEC coach harness wire to the "Depressed" terminal of the clutch switch if present, then to the NC terminal of the spring-brake switch and the NO terminal of the service-brake switch.
Connect the orange/black (543) wire to the "Released" terminal of the clutch switch, if present, or to the NO terminal of the spring-brake switch if there is no clutch switch.
(If there is a clutch switch present, connect its Common terminal to the NO terminal of the spring-brake switch instead.)
Connect the Common terminal of the spring-brake (parking brake) switch to the NC terminal of the service-brake switch. Run a wire from the Common terminal of the service-brake switch to the dash panel. This completes wiring of the brake and clutch switches.
Connect the wire from the service brake switch to the Common terminals of all three dash-panel switches.
Connect the black/white (953) wire from the coach harness to the NO terminal of the "Cruise Enable" switch. There is no connection to the NC terminal, if present.
Connect the brown/white (544) wire to the NC terminal of the "Resume/Accel" switch, and the light-blue/yellow (545) wire to the NO terminal.
Connect the yellow (542) wire to the NC terminal on the "Set/Coast" switch, and the yellow/red (541) wire to the NO terminal.
Connect the green cruise-enabled light between the pink (439) and tan (555) wires. If you use a 12-volt LED pilot light, you'll have to figure out which one is the (+) and which is the (-) wire of the two.
That completes the wiring. Now all you have to do is trot down to a shop that has the ability to program the DDEC computer so they can install the information about tire size and rear-end ratio so the computer knows what engine speed matches 30 mph so it will drop out of cruise if going too slow, and so it won't try to run faster than the vehicle is capable of or set up to run. You wouldn't want the engine trying to maintain 75 mph on a bus that can only go 72, for example.
Like they say, given enough time and money, anything's possible. :-)
Now let's try posting this thing again. :-( |
Greg Roberts (172.131.220.59)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 06, 2001 - 11:19 pm: | |
Clark, Thanks for the good info. I too posted earlier and nothing showed up. Have you actually added the switches to a DDEC II? Again, Thanks. |
Clarke Echols (216.17.134.118)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 07, 2001 - 11:00 am: | |
Haven't yet. My Neoplan that I bought for parts for the bus I'm building isn't equipped with cruise, and I was planning to make the change when I move the engine across. Then my wife objected, wanting to use the bus as a family "van" for a while and take some trips. That's OK. The more she sees this stuff, the more supportive she is of this whole crazy idea anyway. :-)
I called Stewart & Stevenson in Denver yesterday, and that's how I found out about having to program the wheel and rear-end data into the computer. If you don't have everything done right when you go in, they have to do the work to get it up to snuff before programming. It's a liability/safety thing.
Clarke |
Greg Roberts (172.147.123.245)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, July 11, 2001 - 9:32 pm: | |
Clarke,
Where are these wire numbers located? I have looked at my Eagle manuals and I am just not seeing the numbers you are mentioning. Are these DDEC numbers and do I need to get a DDEC wiring diagram? Where in the dash area would I fing the wired to connect to? Can't find these wire numbers in the front junction box or the rear either. My bus is an Eagle 20 if this makes a difference to your wiring resource. Thanks Clarke |
ART Gill (216.3.82.241)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, August 12, 2001 - 9:50 pm: | |
Clark,
I also have an Eagle Model 20 , 1989 model, with a 6V92. The DDEC is a Silver box mounted on top of the engine. Is this an earlier version than the II? Mine Eagle is a NJ bus and it has a plug behind the drivers seat to connect the handheld programer to. In addition to cruise control, I would like to have a computer connected to the DDEC to give all the neat things like mile travel, fuel used, fuel left, ETA to destination, etc.
Art |
Greg Roberts (172.165.112.9)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, September 08, 2001 - 3:44 pm: | |
Clark and Art,
On the Eagle 20 the wire bundle with some of these wires is behind the left dash panel. The wires that are supposed to connect the brake/clutch to the ECM are not in the group. Also the wires that go to road speed are not ran to the dash in this bundle. Clark, do you think that these two are already connected to the DDEC II? I am thinking that it is very possible since the there is a retarder on the transmission that is sensed fron the brake pedal and this function is computer controlled. What do you think? |
|