Home » Public Forums » GMCnet » [GMCnet] Air suspension and leveling system
| Re: [GMCnet] Air suspension and leveling system [message #319325 is a reply to message #319312] |
Tue, 20 June 2017 08:59   |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma:
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Senior Member |
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Thats interesting Rob
The problem is what is the 'right' time delay?
Do you want the coach to adjust while taking a turn, like a cloverleaf or roundabout?
I say no, thats a bad idea
What about cross winds?
Yes
crowned roads?
Definitly
Ideally the system would sense steering angle and then it would be able to do the right thing.
Maybe using an accelerometer could determine if the coach is turning...
________________________________
From: Gmclist on behalf of Rob Mueller
Sent: Monday, June 19, 2017 7:33:40 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Air suspension and leveling system
G'day,
I apologize for my original email as it was not clear.
It should have read:
If the GMC suspension engineers didn't think the automatic leveling system WITH HEIGHT CONTROL TO COMPENSATE FOR VARYING ROAD
CONDITIONS . . . . . . . .
The road that leads to the storage facility where I keep Double Trouble in Huffman is highly crowned. Just before the facility is a
decreasing radius left hand turn. The speed limit on that road is 30mph. One time when I went around that turn in Double Trouble I
was going a bit too quick and I scared the s#!t out of myself! The crown in the road had the coach leaning to the right, going
around the left hand turn made it lean further yet and the decreasing radius was the icing on the cake, I almost lost it!
When I got back to the shop I noticed that the PowerLevel valves were in HOLD not TRAVEL. Subsequent to this incident I ALWAYS check
to make sure they are in TRAVEL when I drive Double Trouble.
My theory is that when a GMC is going down a crowned road it will lean to the right, the system will sense this and after the built
in time delay it will add pressure to the air bags on the right side to decrease the lean.
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of James Hupy
Sent: Tuesday, June 20, 2017 2:26 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Air suspension and leveling system
Let's see, they could have coil over airbags filled with a slurry of
magnetically sensitive material that could be surrounded by a strong
electromagnetic coil, the field strength of which could be influenced by
forward looking sensors. That way when a pothole or truck groove were
detected, the suspension could react before obstacles were encountered.
Many times a second.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Jun 19, 2017 7:59 AM, "Gerald Work" wrote:
> Hi Rob,
>
> Tongue firmly planted in cheek I would suggest your logic ignores the
> obvious.
>
> The GMC engineers did what they did based on technology available to them
> at the time. At that time they had no option for a far simpler, more
> reliable, less expensive and flexible Air control system such as we do
> today with things like the wireless air controller. Who knows how they
> might have elected to design this system if they did, but I really doubt
> they would have elected to fill the coach with air lines, fittings and
> numerous leak points as they had to do given the options available to them
> at the time. They likely also would not have had to try three times in six
> years to come up with the semi-satisfactory compromise.
>
> Tongue still firmly planted in cheek, if they had the same redesign rate
> over the ensuing 40 plus years if GMC continued to be produced we could now
> be dealing with auto air control system version 23. Hmmmmmm.
>
> Me thinks this is one case where newer technology trumps old school.
>
> Jerry
> Jerry Work
> The Dovetail Joint
> Fine furniture designed & hand crafted
> in the 1907 former Masonic Temple building
> in historic Kerby, OR
> http://jerrywork.com
> ................
> Message: 13
> Date: Mon, 19 Jun 2017 14:15:21 +1000
> From: "Rob Mueller"
> To:
> Subject: Re: [GMCnet] Air suspension and leveling system
> Message-ID:
> Content-Type: text/plain; charset="us-ascii"
>
> Rich, Matt,
>
> I agree with both of you!
>
> If the GMC suspension engineers didn't think the automatic leveling system
> was necessary why did they install it?
>
> AND why did the accountants approve it?
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> USAussie - Downunder
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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