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From: E. Meyer on 26 Mar 2010 09:03
On 3/25/10 8:52 PM, in article
4-idndohTq_BjjHWnZ2dnUVZ_qWdnZ2d(a)giganews.com, "dr_jeff" <utz(a)msu.edu>
wrote:

> clare(a)snyder.on.ca wrote:
>> On Thu, 25 Mar 2010 17:28:15 -0500, dbu'' <nospam(a)nobama.com.invalid>
>> wrote:
>>
>>> In article <4babdcf1$1_2(a)news.tm.net.my>, "TE Cheah" <4ws(a)gmail.com>
>>> wrote:
>>>
>>>> 15 yr ago I read of 1 car in USA using auto cruise control drtve
>>>> past a truck using CB radio, this car @ once got unintended
>>>> acceleration, this driver switched off his auto cruise & ended this
>>>> problem. He told medias to warn users of auto cruise control
>>>> against CB radios.
>>> Maybe fifteen years ago, but EMI suppression has advanced since then in
>>> the automotive industry and many other industries too.
>> There was ONE model of cruise control I heard about that was
>> extra-fussy about CB Radio interference and IIRC it was OK with a 4
>> watt unit installed in the vehicle, but a 100 watt Linear amp in a
>> vehicle within a couple hundred feet could "jam" it.
>>
>> Those cruise control units were VERY primitive compared to anything on
>> the market today. The affected unit was made by ARA if I remember
>> correctly and the problem only occurred if using the engine speed
>> sensor option instead of the magnets on the driveshaft - and that was
>> closer to 20 or 25 years ago (very early 1980s - early Chevy Citation
>> comes to mind.
>
> Cruise control usually used vehicle speed rather than engine speed. If
> the car kicks in a lower gear (e.g., when going up hill), then the car
> would slow down to keep the engine speed constant.
>
> I am not saying that there weren't any cars that used engine speed
> rather than vehicle speed, but I would think that there are few.
>
> Jeff

Every car I have owned, starting with the 1960 Chrysler Imperial, has been
equiped with cruise control. They are/were all designed to regulate vehicle
speed, not engine speed. I can't remember any instance of a system that
attempted to regulate engine speed, though I do remember some aftermarket
kits in the 60's & 70's that were simple mechanical throttle controls.

From: E. Meyer on 26 Mar 2010 09:36
On 3/26/10 8:06 AM, in article EZ-dnRV2qrn7LDHWnZ2dnUVZ_oGdnZ2d(a)posted.visi,
"Mark Olson" <olsonm(a)tiny.invalid> wrote:

> E. Meyer wrote:
>> On 3/25/10 8:52 PM, in article
>> 4-idndohTq_BjjHWnZ2dnUVZ_qWdnZ2d(a)giganews.com, "dr_jeff" <utz(a)msu.edu>
>> wrote:
>
>>> I am not saying that there weren't any cars that used engine speed
>>> rather than vehicle speed, but I would think that there are few.
>
>> Every car I have owned, starting with the 1960 Chrysler Imperial, has been
>> equiped with cruise control. They are/were all designed to regulate vehicle
>> speed, not engine speed. I can't remember any instance of a system that
>> attempted to regulate engine speed, though I do remember some aftermarket
>> kits in the 60's & 70's that were simple mechanical throttle controls.
>
> No one was claiming any factory cruise control worked by keeping engine
> speed fixed. Aftermarket cruise controls had that option though, and for
> cars with standard transmission it was a reasonable choice to tap off the
> coil signal rather than affix magnets to the driveshaft. The only down-
> side was if you set the cruise to 60 in 5th gear, and resumed in 4th you'd
> be doing 70 or so, depending on gear ratios.
>
All the aftermarket kits (as well as factory add-on kits) I encountered for
manual shift cars all passed the speedometer cable through the unit for
speed sensing and added a second cut off to the clutch pedal (along with the
brake pedal cut off present on automatic trans units).

From: E. Meyer on 26 Mar 2010 11:30
On 3/26/10 9:00 AM, in article 0tGdnS2RIcJqIDHWnZ2dnUVZ_s0AAAAA(a)posted.visi,
"Mark Olson" <olsonm(a)tiny.invalid> wrote:

> E. Meyer wrote:
>> On 3/26/10 8:06 AM, in article EZ-dnRV2qrn7LDHWnZ2dnUVZ_oGdnZ2d(a)posted.visi,
>> "Mark Olson" <olsonm(a)tiny.invalid> wrote:
>>
>>> E. Meyer wrote:
>>>> On 3/25/10 8:52 PM, in article
>>>> 4-idndohTq_BjjHWnZ2dnUVZ_qWdnZ2d(a)giganews.com, "dr_jeff" <utz(a)msu.edu>
>>>> wrote:
>>>>> I am not saying that there weren't any cars that used engine speed
>>>>> rather than vehicle speed, but I would think that there are few.
>>>> Every car I have owned, starting with the 1960 Chrysler Imperial, has been
>>>> equiped with cruise control. They are/were all designed to regulate
>>>> vehicle
>>>> speed, not engine speed. I can't remember any instance of a system that
>>>> attempted to regulate engine speed, though I do remember some aftermarket
>>>> kits in the 60's & 70's that were simple mechanical throttle controls.
>>> No one was claiming any factory cruise control worked by keeping engine
>>> speed fixed. Aftermarket cruise controls had that option though, and for
>>> cars with standard transmission it was a reasonable choice to tap off the
>>> coil signal rather than affix magnets to the driveshaft. The only down-
>>> side was if you set the cruise to 60 in 5th gear, and resumed in 4th you'd
>>> be doing 70 or so, depending on gear ratios.
>>>
>> All the aftermarket kits (as well as factory add-on kits) I encountered for
>> manual shift cars all passed the speedometer cable through the unit for
>> speed sensing and added a second cut off to the clutch pedal (along with the
>> brake pedal cut off present on automatic trans units).
>
> I installed two kits such as I described in 1981 Dodge Colts, I can't remember
> the brand name, they had the option of putting magnets on the driveshaft
> (axle shaft in a FWD car) or picking the signal off the coil. I've also
> installed an Audiovox CCS-100 cruise control in a motorcycle, and it has the
> option of picking the speed signal off the coil or fitting a magnetic pickup
> to a driveshaft (not on a motorcycle obviously).
>
>
> installed a similar kit in a motorcycle

You're about 15 years newer than my generation. I guess it all depends on
when you did it.

The most exciting ones were the Perfect Circle units in use in the 60's.
The '60 Imperial and the '63 Olds both had the same unit. Mechanical
throttle linkage & electronic servo, none of this wimpy vacuum stuff.

Every once in a while it would have a brain fart and just slam the pedal to
the floor. If you could get the edge of your shoe under it you could pull
it back, but you had to be quick & since both of those cars had huge V8's,
the other foot would be immediately firmly planted on the crappy drum
brakes.

Just to make it more fun, the cruise didn't have to be engaged for this
"feature" to work. Definitely added a degree of excitement to driving.
Reports of little old ladies plowing through the back of their garages
prompted the first round of fail-safes and controls on these things.

As far as I know now, the cruise functionality is handled by the ECM on
pretty much all new cars, which leads us right back to software.

From: E. Meyer on 26 Mar 2010 16:43
On 3/26/10 2:51 PM, in article tm3qq5p3ms5rs8tfhl74auqb5hbekl3in6(a)4ax.com,
"clare(a)snyder.on.ca" <clare(a)snyder.on.ca> wrote:

> On Thu, 25 Mar 2010 21:52:28 -0400, dr_jeff <utz(a)msu.edu> wrote:
>
>> clare(a)snyder.on.ca wrote:
>>> On Thu, 25 Mar 2010 17:28:15 -0500, dbu'' <nospam(a)nobama.com.invalid>
>>> wrote:
>>>
>>>> In article <4babdcf1$1_2(a)news.tm.net.my>, "TE Cheah" <4ws(a)gmail.com>
>>>> wrote:
>>>>
>>>>> 15 yr ago I read of 1 car in USA using auto cruise control drtve
>>>>> past a truck using CB radio, this car @ once got unintended
>>>>> acceleration, this driver switched off his auto cruise & ended this
>>>>> problem. He told medias to warn users of auto cruise control
>>>>> against CB radios.
>>>> Maybe fifteen years ago, but EMI suppression has advanced since then in
>>>> the automotive industry and many other industries too.
>>> There was ONE model of cruise control I heard about that was
>>> extra-fussy about CB Radio interference and IIRC it was OK with a 4
>>> watt unit installed in the vehicle, but a 100 watt Linear amp in a
>>> vehicle within a couple hundred feet could "jam" it.
>>>
>>> Those cruise control units were VERY primitive compared to anything on
>>> the market today. The affected unit was made by ARA if I remember
>>> correctly and the problem only occurred if using the engine speed
>>> sensor option instead of the magnets on the driveshaft - and that was
>>> closer to 20 or 25 years ago (very early 1980s - early Chevy Citation
>>> comes to mind.
>>
>> Cruise control usually used vehicle speed rather than engine speed. If
>> the car kicks in a lower gear (e.g., when going up hill), then the car
>> would slow down to keep the engine speed constant.
>>
>> I am not saying that there weren't any cars that used engine speed
>> rather than vehicle speed, but I would think that there are few.
>>
>> Jeff
>
>
> I've installed likely hundreds of aftermarket cruise controls - and on
> front drive vehicles - and particularly with automatic transmissions,
> there were a LOT that used engine RPM to sense speed..
> Compucruise had that option for sure, as did ARA if I remember
> correctly, and at least one other major manufacturer that I cannot
> remember right now.. If the transmission downshifted the cruise
> control immediately shut down, the same as on a standard shift car.
> ANYTHING that allowed the engine speed to climb quickly disengages the
> cruise on these units - without requiring a clutch switch if installed
> on a standard.
>

Boy, that's one sucky setup. Useless from any practical standpoint.

> I do remember at least one GM X-Car installation that didn't like a
> HAM radio installation - and another - can't remember what right off
> hand - that didn't like the old mobile telephone system installation.

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