Re: [doc] Auto trans

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

Um..... what software? It's a discrete analogue device. Dead simple, and 
absolutely up to the task from a theoretical point of view, just poorly 
implemented.

For those who know lectrickery, the system comprises a little alternator 
driving a load* to give a variable voltage output. The stator of the 
alternator is moved by the link cable to the throttle spool, so more or 
less current is generated depending on the position of the throttle. 
This signal is then fed into two comparators, whose voltage references 
differ, and each output drives a FET, which in turn drives each of the 
shift solenoids. When they're both on, it's in 1st, when one switches 
off, it's in 2nd, and when both off, it's in 3rd. This is why when the 
device fails, the tranny sticks in 3rd.

* When the full throttle switch is activated, the load is increased, 
thus dropping the output by predetermined amount, causing the 
transmission to downshift - aka kick-down.

Richard Johnstone has spent a lot of time reverse-engineering the 
governor and has produced several working prototypes utilising more 
robust modern components. He still drives around in his own car with a 
little black box and 3-way switch rather than using the governor.

BTW all of the above may or may not be entirely wrong.... or at least 
wrong in parts.

Martin

Mark wrote:

> Most  Auto-gearbox reconditioners will charge about £350 to £400 to overhaul
> the software in the box.
> 




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