Truth (was: Hi, I'm new...
ard at p850ug1.demon.co.uk
Mon Aug 7 16:57:58 CDT 2006
> On Sunday 06 August 2006 07:43 pm, Chuck Guzis wrote:
> > Get yourself a good book on fluidics. IIRC, a fluidic computer was
> > supposed to replace electronics in rugged environment situations.
> Isn't that how an automatic transmission is supposed to work? Although they
YEs. I have several workshop manuals that cover the Borg-Warner 35
transmission (this was the common automatic transmission used on UK cars
in the 1970s). It really is a clever design. The hydraulic pump, driven
by the engine, is not just used to provide the pressure to operate the
clutches and brake bands, said pressure is also used to move valves
against spring pressure. The faster the engine turns, the more pressure
you get from the pump, and at a certain point the valbe moves far enough
to select some other function.
The better manuals explain exactly what happens for each gear shift...
> apparently have electronics in the newer ones...
Alas yes. My father has just got a new car with electronics everywhere
:-(. There's a control unit for the (automatic) gearbox. According to the
workshop manual, there are 6 solenoid valves inside the gearbox, and also
a manual slide valve coupled to the selector lever. Alas it doesn't
explain what the latter does (if it fails you change the whole valve
block), it doesn't explain what each of the solenoids does (it does give
the dC resistances and the pins on the conector that each solenoid is
linked to so you can find a defective solenoid)
Oh well. I don't suppose I'll ever have to get amongst this, but it would
be interesting to know what's going on.
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