Steve, all...
interesting about cruise control. Why would it have to be a speed sensor at
a wheel? Why could it not be simply a tach or rpm reading. The controller
then only needs to add more gas or take away to keep the rpm the same. SAme
rpm in gear means same speed does it not? Have I seen something like
this...i dunno...but it seems tlike it would be simple to implement.
mayf
----- Original Message -----
From: "Steve Laifman" <SLaifman@socal.rr.com>
To: "James E. Pickard" <geowiz@cox-internet.com>; "List, Tiger"
<tigers@autox.team.net>
Sent: Monday, September 02, 2002 11:53 AM
Subject: Re: cruise control
> Jim,
>
> Although I am unaware of any current after market cruise control system,
> mainly for two reasons.
>
> 1) There must be an added, direct reading, speed measurement system.
> This usually consists of a brake rotor magnet and sensing coil, or
> perhaps something on the drive shaft. On a new build it is easy.
>
> After market for many car models is a challenge.
> 2) There must also be an electronic throttle control device that takes
> the computer's sensed speed, compared to required speed, and increases
> throttle opening, or backs off, as computer signals demand.
>
> This would be another difficult challenge for multiple ,
> model/manufacturer designs.
>
> Additionally, most cars, for many years, have had these as options,
> standard equipment, or dealer selected packages for flooring. Therefore
> the market for most cars would be very small.
>
> The liability, in case of accident, would be a very large hurdle for an
> after-market company in today's litigious environment.
>
> In 1954 my new XK120 had a factory installed speed control that worked
> very effectively. The factory insisted that large strains be prohibited
> during early break-in. Most manufacturers would just warn the user to go
> easy on acceleration, and increase top speed gradually.
>
> Jag had a better idea, and cost effective as well. The car came with a
> wooden block under the accelerator pedal, to be removed by the dealer at
> the appropriate mileage. It allowed, essentially, 1/4 throttle maximum
> travel. Leisurely take off from stop. Moderate acceleration, and limited
> (though not slow) top speed. We would get on what few freeways existed
> back then, and just keep putting the miles on. You could see and feel
> the blocked performance keep increasing daily, as break-in allowed
> easier running.
>
> So, there is a pretty inexpensive Tiger option, based on the very best
> British technology.
>
> Try it, it couldn't hurt. (9-)
>
> Steve
>
> --
>
> Steve Laifman
> Editor
> http://www.TigersUnited.com
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